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1 of 22 optimum technology matching? applied gaas hbt ingap hbt gaas mesfet sige bicmos si bicmos sige hbt gaas phemt si cmos si bjt gan hemt functional block diagram rf micro devices?, rfmd?, optimum technology matching?, enabling wireless connectivity?, powerstar?, polaris? total radio? and ultimateblue? are trademarks of rfmd, llc. bluetooth is a trade- mark owned by bluetooth sig, inc., u.s.a. and licensed for use by rfmd. all other trade names, trademarks and registered tradem arks are the property of their respective owners. ?2006, rf micro devices, inc. product description 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . rf mems lb rf in tx en vramp hb rf in rx 1 rx 2 rx 3 rx 4 antenna b3 vsense b1 b2 vbatt 2 3 4 5 9 13 6 14 15 16 21 7 8 1 fully integrated power control circuit and switch decoder gsm gaas die dcs/pcs gaas die phemt switch rf7115 quad-band gsm850 /gsm900/dcs/pcs transmit module the rf7115 is a high-power, high-efficiency transmit module containing rfmd?s power star ? integrated power control, integrated phemt front end antenna switch and harmonic filtering func tionality. all of wh ich combine to pro- vide for best in class harmonic emission control and rx and tx insertion loss. the device is self-contained with 50 input and output terminals with no matching components required. the integrated power control function based on rfmd?s patented power star ? control is incorporated, eliminating the need for directional couplers, detector diodes, power control asic?s, and other power control circuitry; this allows the module to be driven directly from the dac out- put. the device is designed for use as the final portion of the transmit chain in gsm850, egsm900, dcs and pcs gmsk and eliminates the need for pa to antenna switch module matching. on-board power control provides over 70db control range. the integrated antenna switch allows true quad band tx and rx functionality. built-in curr ent limiter option may be utilized to minimize power variation in mismatch condition. features ? reduced solution size integrat- ing antenna switch and har- monic filtering to decrease time to market ? package 7x8x1.2mm ? iec 61000-4-2 compliant ? in/output matched to 50 ? dc block on antenna port ? gsm850/900 p out =33.5dbm ? dcs/pcs p out =30.5dbm ? new current limiter applications ? gsm850/egsm900/dcs/pcs products ? gprs class 12 capable ? power star? module ? 3v quad-band handsets ? portable battery-powered equip- ment rev a0 ds060808 9 9 9 rohs compliant & pb-free product package style: module (7mmx8mm)
2 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . absolute maximum ratings parameter rating unit supply voltage -0.3 to +6.0 v power control voltage (v ramp ) -0.3 to +1.8 v input rf power +10 dbm max duty cycle 50 % output load vswr 20:1 operating case temperature -20 to +85 c storage temperature -55 to +150 c parameter specification unit condition min. typ. max. overall power control v ramp power control ?on? 1.5 v max. p out , voltage supplied to the input power control ?off? 0.2 0.25 v min. p out , voltage supplied to the input v ramp input capacitance 15 20 pf dc to 2mhz v ramp input current 10 av ramp =v ramp max turn on/off time 2 us v ramp =0v to v ramp max power control range 50 db v ramp =0.25v to v ramp max v ramp p out bw 2.0 2.5 mhz overall power supply power supply voltage 3.5 v specifications 3.0 5.5 v nominal operating limits power supply current 1 20 ap in <-30dbm, tx enable=low, v ramp =0v, temp=-20c to +85c, v batt =5.5v overall control signals b1, b2, b3 ?low? 0 0 0.5 v b1, b2, b3 ?high? 1.25 2.0 3.0 v b1, b2, b3 ?high current? 1 2 ua tx enable ?low? 0 0 0.5 tx enable ?high? 1.25 2.0 3.0 v tx enable ?high current? 1 2 ua caution! esd sensitive device. exceeding any one or a combination of the absolute maximum rating conditions may cause permanent damage to the device. extended application of absolute maximum rating conditions to the device may reduce device reliability. specified typical perfor- mance or functional operation of the devi ce under absolute maximum rating condi- tions is not implied. rohs status based on eudirective2002/95/ec (at time of this document revision). the information in this publication is believed to be accurate and reliable. however, no responsibility is assumed by rf micro devices, inc. ("rfmd") for its use, nor for any infringement of patents, or other rights of third parties, resulting from its use. no license is granted by implication or otherwise under any patent or patent rights of rfmd. rfmd reserves the right to change component circuitry, recommended appli- cation circuitry and specifications at any time without prior notice.
3 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . parameter specification unit condition min. typ. max. gsm850 mode temp=+25c, v batt =3.5v, v ramp max , p in =4dbm, 25% duty cycle, pulse width=1154 s operating frequency range 824 849 mhz maximum output power 33.0 34.0 dbm 25% duty cycle, pulse width 1154us 32.8 dbm 50% duty cycle, pulse width 2308us 31.0 dbm temp=+85c, v batt =3.0v, v ramp =v ramp max @ v batt =3.0v total efficiency 37 42 % at p out max , v batt =3.5v input power range 2 4 6 dbm full output power guaranteed at minimum drive level output noise power -88 -83 dbm 869mhz to 894mhz, rbw=100khz, p out > +5dbm <-100 -87 dbm 1930mhz to 1990mhz, rbw=100khz, p out > +5dbm forward isolation 1 -50 -41 dbm txenable=low, p in =+6dbm, v ramp =0.25v, b1=b2=low, b3=high forward isolation 2 -29 -15 dbm txenable=high, p in =+6dbm, v ramp =0.25v, b1=b2=low, b3=high all harmonics up to 12.75ghz -40 -35 dbm over all power levels (5dbm to 33dbm) all non-harmonic spurious -36 dbm over all power levels (5dbm to 33dbm) input vswr 2.5:1 over all power levels (5dbm to 33dbm) output load vswr stability 10:1 spurious<-36dbm, set v ramp where p out < 33.0dbm into 50 load output load vswr ruggedness 20:1 set v ramp where p out < 33.0dbm into 50 load. no damage or permanent degradation to part. input and output impedance 50 note: v ramp max =3/8*v batt +0.15< 1.5v
4 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . parameter specification unit condition min. typ. max. gsm900 mode temp=+25c, v batt =3.5v, v ramp max , p in =4dbm, 25% duty cycle, pulse width=1154 s operating frequency range 880 915 mhz maximum output power 33.0 33.5 dbm 25 % duty cycle, pulse width 1154us 32.8 dbm 50% duty cycle, pulse width 2308us 31.0 dbm temp=+85c, v batt =3.0v, v ramp =v ramp max total efficiency 35 40 % at p out max , v batt =3.5v input power range 2 4 6 dbm full output power guaranteed at minimum drive level output noise power -85 -79 dbm 925mhz to 935mhz, rbw=100khz, p out > +5dbm -89 -83 dbm 935mhz to 960mhz, rbw=100khz, p out > +5dbm <-100 -87 dbm 1805mhz to 1880mhz, rbw=100khz, p out > +5dbm forward isolation 1 -60 -41 dbm txenable=low, p in =+6dbm, v ramp =0.25v, b1=high, b2=low, b3=high forward isolation 2 -27 -15 dbm txenable=high, p in =+6dbm, v ramp =0.25v, b1=high, b2=low, b3=high all harmonics up to 12.75ghz -40 -35 dbm over all power levels (5dbm to 33dbm) all non-harmonic spurious -36 dbm over all power levels (5dbm to 33dbm) input vswr 2.5:1 over all power levels (5dbm to 33dbm) output load vswr stability 10:1 spurious<-36dbm, set v ramp where p out < 33.0dbm into 50 load output load vswr ruggedness 20:1 set v ramp where p out < 33.0dbm into 50 load input and output impedance 50 note: v ramp max =3/8*v batt +0.15< 1.5v
5 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . parameter specification unit condition min. typ. max. dcs1800 mode temp=+25c, v batt =3.5v, v ramp max , p in =4dbm, 25% duty cycle, pulse width=1154 s operating frequency range 1710 1785 mhz maximum output power 30.0 31.0 dbm 25% duty cycle, pulse width 1154us 29.8 dbm 50% duty cycle, pulse width 2308us 28.0 dbm temp=+85c, v batt =3.0v, v ramp =v ramp max total efficiency 32 37 % at p out max , v batt =3.5v input power range 2 4 6 dbm full output power guaranteed at minimum drive level output noise power -92 -87 dbm 1805mhz to 1880mhz, rbw=100khz, p out > 0dbm <-100 -87 dbm 925mhz to 935mhz, rbw=100khz, p out > 0dbm <-100 -84 dbm 935mhz to 960mhz, rbw=100khz, p out > 0dbm forward isolation 1 -60 -53 dbm txenable=low, p in =+6dbm, v ramp =0.25v, b1=low, b2=high, b3=high forward isolation 2 -20 -15 dbm txenable=high, p in =+6dbm, v ramp =0.25v, b1=low, b2=high, b3=high all harmonics up to 12.75ghz -40 -35 dbm over all power levels (0dbm to 30dbm) all non-harmonic spurious -36 dbm over all power levels (0dbm to 30dbm) input vswr 2.5:1 over all power levels (0dbm to 30dbm) output load vswr stability 10:1 spurious<-36dbm, set v ramp where p out < 30.0dbm into 50 load output load vswr ruggedness 20:1 set v ramp where p out < 30.0dbm into 50 load. no damage or permanent degradation to part. input and output impedance 50 note: v ramp max =3/8*v batt +0.15< 1.5v
6 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . parameter specification unit condition min. typ. max. pcs1900 mode temp=+25c, v batt =3.5v, v ramp max , p in =4dbm, 25% duty cycle, pulse width=1154 s operating frequency range 1850 1910 mhz maximum output power 30.0 31.0 dbm 25 % duty cycle, pulse width 1154us 29.8 dbm 50% duty cycle, pulse width 2308us 28.0 dbm temp=+85c, v batt =3.0v, v ramp =v ramp max total efficiency 32 37 % at p out max , v batt =3.5v input power range 2 4 6 dbm full output power guaranteed at minimum drive level output noise power -92 -87 dbm 1930mhz to 1990mhz, rbw=100khz, p out > 0dbm <-100 -87 dbm 869mhz to 894mhz, rbw=100khz, p out > 0dbm forward isolation 1 -60 -53 dbm txenable=low, p in =+6dbm, v ramp =0.25v, b1=b2=b3=high forward isolation 2 -20 -15 dbm txenable=high, p in =+6dbm, v ramp =0.25v, b1=b2=b3=high all harmonics up to 12.75ghz -40 -35 dbm over all power levels (0dbm to 30dbm) all non-harmonic spurious -36 dbm over all power levels (0dbm to 30dbm) input vswr 2.5:1 over all power levels (0dbm to 30dbm) output load vswr stability 10:1 spurious<-36dbm, set v ramp where p out < 30.0dbm into 50 load output load vswr ruggedness 20:1 set v ramp where p out < 30.0dbm into 50 load. no damage or permanent degradation to part. input and output impedance 50 note: v ramp max =3/8*v batt +0.15< 1.5v
7 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . parameter specification unit condition min. typ. max. rx-section nominal conditions insertion loss, ant-rx1-4 temp=+25c, v cc =3.5v freq 869mhz to 894mhz 1.0 1.3 db tx=low, b1=low, b2=low, b3=high freq 925mhz to 960mhz 1.0 1.3 db tx=low, b1=high, b2=low, b3=x freq 1805mhz to 1880mhz 1.3 1.6 db tx=low, b1=low, b2=high, b3=x freq 1930mhz to 1990mhz 1.3 1.6 db tx=low, b1=high, b2=high, b3=x insertion loss, ant-rx1-4 extreme conditions freq 869mhz to 894mhz 1.4 1.7 db temp=-20c, +25c, and +85c, v cc =3.0v, 3.5v, and 5.5v freq 925mhz to 960mhz 1.4 1.7 db freq 1805mhz to 1880mhz 1.7 2.0 db freq 1930mhz to 1990mhz 1.7 2.0 db ripple, ant-rx1-4 nominal conditions freq 869mhz to 894mhz 0.02 0.20 db temp=+25c, v cc =3.5v freq 925mhz to 960mhz 0.02 0.20 db freq 1805mhz to 1880mhz 0.06 0.20 db freq 1930mhz to 1990mhz 0.06 0.20 db return loss, ant-rx1-2 nominal conditions freq 869mhz to 894mhz -22 -15 db temp=+25c, v cc =3.5v freq 925mhz to 960mhz -22 -15 db return loss, ant-rx3-4 freq 1805mhz to 1880mhz -14 -12 db freq 1930mhz to 1990mhz -14 -12 db
8 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . parameter specification unit condition min. typ. max. tx-section isolation, ant-rx1-4 freq 824mhz to 849mhz rx1 -0.75 10 dbm temp=+25c, v cc =3.5v, p out =33dbm rx2 -0.75 10 dbm temp=+25c, v cc =3.5v, p out =33dbm rx3 1.75 10 dbm temp=+25c, v cc =3.5v, p out =33dbm rx4 1.75 10 dbm temp=+25c, v cc =3.5v, p out =33dbm freq 880mhz to 915mhz rx1 0.25 10 dbm temp=+25c, v cc =3.5v, p out =33dbm rx2 0.25 10 dbm temp=+25c, v cc =3.5v, p out =33dbm rx3 2.50 10 dbm temp=+25c, v cc =3.5v, p out =33dbm rx4 2.50 10 dbm temp=+25c, v cc =3.5v, p out =33dbm freq 1710 mhz to 1785 mhz rx1 8.50 10 dbm temp=+25c, v cc =3.5v, p out =30dbm rx2 5.00 10 dbm temp=+25c, v cc =3.5v, p out =30dbm rx3 -5.00 10 dbm temp=+25c, v cc =3.5v, p out =30dbm rx4 5.50 10 dbm temp=+25c, v cc =3.5v, p out =30dbm freq 1850mhz to 1910mhz rx1 9.25 10 dbm temp=+25c, v cc =3.5v, p out =30dbm rx2 6.00 10 dbm temp=+25c, v cc =3.5v, p out =30dbm rx3 -5.50 10 dbm temp=+25c, v cc =3.5v, p out =30dbm rx4 6.00 10 dbm temp=+25c, v cc =3.5v, p out =30dbm note: isolation specification max limit set to ensure at least 20db of isolation. calculation example: p out @a nt -p out @rxport, lo band isolation=33-10=23db, hi band isolation=30-10=20db. additional rx3 circuitry ensures specification for hi band tx-rx overlappin g frequencies. lo band rx-rx overlapping frequencies has sufficient margin.
9 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . pin function description interface schematic 1vsense can provide two purposes: 1. the current limiter can be set by adding a resistor to determine the set point. when open, the current limiter feature is fully engaged and shorter the current limiter is disabled. 2. a voltage proportional to the pa current can be detected and used as feedback to the baseband. see application note for further details. 2 gsm850/ gsm900 in rf input to the gsm850/gsm900 band. this is a 50 input. 3b1 control pin that together with b2 and b3 selects band of operation. 4b2 control pin that together with b1 and b3 selects band of operation. 5vbatt power supply for the module. this should be connected to the battery ter- minal using as wide a trace as possible. 6b3 control pin that together with b1 and b2 selects band of operation. 7 tx enable this signal enables the pa module for operation with a logic high. the switch is put in tx mode determined by b1, b2, and b3. 8 vramp vramp ramping signal from dac. a simple rc filter may need to be con- nected between the dac output and the v ramp input depending on the baseband selected. 9 dcs/pcs in dcs/pcs in rf input to the dcs/pcs band. this is a 50 input. 10 gnd 11 gnd 12 gnd 13 rx 1 rx 1 port of antenna switch. this is a 50 output. note that there will be a dc voltage present equal to v batt -0.5v. 14 rx 2 rx 2 port of antenna switch. this is a 50 output. note that there will be a dc voltage present equal to v batt -0.5v. 15 rx 3 rx 3 port of antenna switch. this is a 50 output. note that there will be a dc voltage present equal to v batt -0.5v. additional logic provided to improve isolation at 2f 0 of gsm band. tx enable tx on + - hb rf in rx850 rx900 rx1800
10 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . pin function description interface schematic 16 rx 4 rx 4 port of antenna switch. this is a 50 output. note that there will be a dc voltage present equal to v batt -0.5v. 17 gnd 18 gnd 19 gnd 20 gnd 21 ant antenna port of antenna switch. this is a 50 output. provides dc block- ing as well as esd protection. 22 gnd 23 gnd pkg base gnd rx1900 antenna
11 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . theory of operation product description the rf7115 is a high-power, high-efficiency, transmit module (txm) with fully-integrated power control functionality, harmonic filtering, band selectivity, and tx/rx switching. the txm is self-contained, with 50 i/o terminals with four rx ports allowing true quad band operation. the power cont rol function eliminates all power control circuitry, including directional couplers, diode detectors, and power control asic?s, etc. the power cont rol capability provides 50db continuous control range, and 70db total control range, using a dac-compatible, analog voltage input. the tx enable feature provides for pa activation (tx mode) or rx mode/stand-by. intern al switching provides a low-loss, low-distortion path from the antenna port to the tx path (or rx port), while maintaining proper isolation. integrated filter ing provides etsi compliant harmonic suppression at the antenna port even under high mismatch conditions, which is important as modern antennas today often present a load that signifi- cantly deviates from nominal impedance. overview the rf7115 is a true quad-band gsm850, egsm900, dcs1800, and pcs1900 power amplifier module with fully integrated power control functionality, harmonic filter ing, band selectivity and tx /rx switching. this simplifies the phone design by elim i- nating the need for the complicated control loop design, harm onic filters, tx/rx switch and possible matching components between these. the power control loop can be driven directly fr om the dac output in the baseband circuit. the module has 4 rx ports for gsm850. egsm900, dcs1800, and pcs1900 bands of op eration. for optimum performance, it is best to use rx1 and rx2 for low band, and rx3 and rx4 for high band operation. best forward isolation can be achieved in these states during the off mode as well. to control the mode of operation, there are four logic control signals; tx enable, b1, b2, and b3. refer to truth table below for mode of operations. if control signals ar e limited, eliminate the use of the standby mode and b3 may remain in the high state for all modes of operation. by also changing the don?t care state (x) of b1 allows minimum control logic switching between on and off states. module control and antenna switch logic tx_en b1b2b3 tx module mode 0 0 0 0 stand by mode 000 1 rx 1 010 x rx 2 001 x rx 3 011 x rx 4 1 x 0 1 tx low band (gsm850/egsm900) 1 x 1 1 tx high band (dcs1800/pcs1900)
12 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . power control theory of operation most power control systems in gsm sense either forward power or collector/drain current. the rf7115 uses rfmd?s power star r collector voltage control instead of a power or current detector . a high-speed control loop is incorporated to regulate the collector voltage of the amplifier while the stages are held at a constant bias. the basic circuit is shown in the following di a- gram. by regulating the power, the stages are he ld in saturation across all power levels. as the required output power is decreased from full power down to -15dbm, the collector voltage is also decreased. this regulation of output power is demonstrated in equation 1 where the relationship between collector voltage and output power is shown. although load impedance affects out- put power, supply fluctuations are the dominate mode of power variations. with the rf7115 regulating, there are several key factors to consider in the implementation of a transm itter solution for a mobile phone. some of them are: (eq. 1) ? effective efficiency ( eff ) ? current draw and system efficiency ? power variation due to supply voltage ? power variation due to frequency ? power variation due to temperature ? input impedance variation ? noise power ? loop stability ? loop bandwidth variations across power levels ? burst timing and transient spectrum trade offs ? harmonics ? post pa loss ? insertion loss in receive ports ? tx power leakage into the rx ports ? performance during vswr ? time needed to implement the solution ? needed board area for the solution talk time and power management are key concerns in transmitte r design since the power amplifier is the leading current con- sumer in a mobile terminal. considering only the power amplifier' s efficiency does not provide a true picture for the total sys - tem efficiency. it is important to consider effective efficiency which is represented by eff . ( eff considers the loss between the pa and antenna and is a more accurate measurement to de termine how much current will be drawn in the application). eff is defined by the following relationship (equation 2): (eq. 2) rf in rf out h(s) vramp tx enable vbatt p dbm 10 2 v cc v sat ? ? () 2 8 r load 10 3 ? ?? ------------------------------------------- log ? = eff 10 p pa p loss + 10 ------------------------------ 10 p in 10 ------- - ? v bat i bat 10 ?? ------------------------------------------------ - =
13 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . where p pa is the output power from the pa, p loss the insertion loss and p in the input power to the pa. the rf7115 improves the effective efficiency by minimizing the p loss term in the equation. an asm may have a typical loss of 1.2 db in lb and 1.4db in high band. to be added to this is trace losses and mismatch losses. a post pa loss of 1.5db in lb and 1.8db in hb is com- mon. with the integration of a low loss phemt switch and matchi ng network in the same module, higher system efficiency can be achieved. output power does not vary due to supply volt age under normal operating conditions if v ramp is sufficiently lower than v batt . by regulating the collector voltage to the pa the voltage sensit ivity is essentially eliminated. this covers most cases where t he pa will be operated. however, as the battery discharges an d approaches its lower power range the maximum output power from the pa will also drop slightly. in this case, it is important to also decrease v ramp to prevent the power control from induc- ing switching transients. these transients occur as a result of the control loop slowing down and not regulating power in accor - dance with v ramp . the relationship for v rampmax based on v batt is expressed in equation 3. (eq. 3) the components following the power amplifie r often have insertion loss variation with respect to frequency. usually, there is some length of microstrip that follows the power amplifier. th ere is also a frequency response found in directional couplers due to variation in the coupling factor over frequency, as well as the sensitivity of the detector diode. since the rf7115 does not use a directional coupler with a diode detector, these variat ions do not occur. also the tx/rx switch with low pass filters that usually follows the pa may contribute to frequency variatio n. the tx/rx switch incorporated in the rf7115 is very broad- band and does not contribute to frequency roll off. traditionally working with pa modules, some matching network is necessary between the pa output and the input of the tx/rx switch in orde r to get best possible performance. this work no longer has to be carried out, as this matching network is included in the rf7115. noise power in pa's where output power is controlled by changi ng the bias voltage is often a problem when backing off of out- put power. the reason is that the gain is changed in a ll stages and according to the noise formula (equation 4), (eq. 4) the noise figure depends on noise factor and gain in all stages. because the bias point of the rf7115 is kept constant the gain in the first stage is always high and the overall nois e power is not increased when decreasing output power. power control loop stability often presents many challenges to transmitter design. designing a proper power control loop involves trade-offs affecting stability, transient spectrum and burst timing. the rf7115 loop bandwidth is determined by internal band width and does not change with respect to power levels. this makes it easier to maintain loop stabilit y with a high bandwidth loop since the bias voltage and collector voltage do not vary. an often overlooked problem in pa control loops is that a delay no t only decreases loop stability it also affects the burst timing when, for instance the input power from the vco decreases (or in creases) with respect to temperature or supply voltage. the burst timing then appears to shift to the right especially at low power levels. the rf7115 is insensitive to a change in input power and the burst timing is constant and requires no softwa re compensation. switching transients occur when the up and down ramp of the burst is not smooth enough or suddenly change s shape. if the control slope of a pa has an inflection point within the output power range or if the slope is simply too st eep it is difficult to prevent switching transients. controlling the out- put power by changing the collector voltage is as earlier desc ribed based on the physical relationship between voltage swing and output power. furthermore all stages are kept co nstantly biased so inflexion points are nonexistent. harmonics are natural products of high effi ciency power amplifier design. an ideal class ?e? saturated power amplifier will pro - duce a perfect square wave. looking at the fourier transform of a square wave reveals high harmonic content. although this is common to all power amplifiers, there are other factors that co ntribute to conducted harmonic content as well. with most power control methods a peak power diode detector is used to rectify and sense forward power. through the rectification pro- cess there is additional squaring of the waveform resulting in higher harmonics. the rf7115 address this by eliminating the need for the detector diode. therefore the harmonics coming ou t of the pa should represent the maximum power of the har- monics throughout the transmit chain. this is based up on proper harmonic termination of the transmit port. v rampmax 3 8 -- - v batt 0.15 1.5 v + = f tot f 1 f 21 ? g 1 --------------- - f 31 ? g 1 g 2 ? ------------------- ++ =
14 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . performance under vswr often overlooked when designing transmitters is the fact that they normally operate under mismatch conditions while they are designed to operate only under perfect 50 ohm loads. this mean s that in the real application, performance is degraded. this performance degradation may include reduction in output powe r, increased harmonic levels, increased transient spectrum and catastrophic failures, breakdown. traditionally designers ha ve verified that the pa does not break during mismatch and this is all verification that has been carried out during mism atch. modern antennas in handsets often present a load that sig- nificantly deviates from nominal impedance. a vswr of 5:1 in not uncommon. in order not to disturb other phones in the same and close by cells, it is important that the etsi specifications for transient spectr um, bust timing and spurious emission are ful- filled even during mismatch conditions. the rf7115 is designed to maintain its performance even under high antenna mis- match conditions. if power variation into a mismatch condition presents a problem, a current limiting option mayb e utilized. the current limiter can be set by adding a resistor to determine the set point. wh en open, the current limiter feat ure is fully engaged and shorter the current limiter is disabled. please refe r to application note for further details. unlike a current controlled power control loop, the voltage cont rolled loop is almost impossible to force out of lock. for the cur- rent controlled loop this easily happens as the current to the power amplifier that the controller tries to keep constant can n ot be maintained during some phase angles. if the output stage of the power amplifier faces a high impedance due to mismatch at the antenna, then the last stage simply cannot sink the current it does in a 50 load condition. as the loop detects the lower current, the control voltage to the po wer amplifier increases in an attempt to k eep the current constant. as it is imposs i- ble to reach the desired current, the control voltage for the powe r amplifier rails and the error is accumulated in the integra tor in the control loop. when the reference value is lowered when th e down ramp starts, the integrator still contains the accumu- lated error and the control voltage to the power amplifier does no t track the reference signal. this means that the burst will be too long and that when the error finally reaches zero in the integrator, the control voltage to the power amplifier suddenly decreases and this will contribute to increased le vels of transient spectrum at the down ramp. the power star methodology is superior to the traditional current control method; it allows the transient spectrum in normal operation to be in the order of -35dbm to -40dbm but also bo th transient spectrum and the power versus time performance is unaffected even with severe mismatch. in addition to this, the harmonics of the rf7115 is designed to be within etsi limits for usage with realistic antennas. tx/rx switch the phemt switch integrated in the rf7115 allows for a low lo ss connection between the antenna port and the four rx ports. the insertion loss in the tx and rx paths is lower than the lo ss for a traditional pin-diode switch solution, which means lower current consumption in tx mode and better receiver sensitivity.
15 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . package drawing 7.000 0.10 8.000 0.10 1 7.800 typ 4.885 typ 4.150 3.350 typ 2.625 typ 1.750 typ 0.950 typ 0.200 typ 2.550 typ 0.150 typ 0.000 5.550 5.685 6.315 6.485 7.350 typ 0.000 0.100 typ 3.050 typ 5.300 6.100 typ 5.600 typ 6.900 typ 0.650 typ 2.250 typ 0.950 typ 0.950 2.325 typ 3.050 typ 3.850 typ 4.650 typ 5.250 typ 5.450 typ 6.250 typ 7.050 typ 1 6.000 typ 5.535 typ 5.365 0.600 typ 1.14 0.040 0.665 typ 1.000 typ 3.350 typ 6.400 typ 1.450 typ 5.750 typ 7.115 7.285 typ 7.850 typ dimensions in mm. shaded areas represent pin 1. package style: module (7mmx8mm)
16 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . pin out 2 3 22 1 gnd 23 4 5 6 7 8 9 10 11 gnd 23 gnd 23 gnd 23 gnd 23 gnd 23 20 19 21 18 17 16 15 14 13 12 vsense b1 lb_rfin b2 vbat b3 tx_en vramp hb_rfin gnd gnd gnd ant gnd gnd gnd gnd rx4 rx3 rx2 rx1 gnd
17 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . application schematic 2 3 4 5 9 13 6 14 15 16 21 7 8 1 fully integrated power control circuit and switch decoder phemt switch 10 gnd: internally connected to hb q2 de-coupling capacitor requires external gnd 11 12 gnd: connected to backside gnd 16 - 20 22 lb rf in 50 strip vsense customer option. see application note. b1 b2 vbatt 4.7 uf b3 txen optional depending on bb selection vramp 50 strip hb rfin 33 pf 33 pf 33 pf 33 pf rx1 rx2 rx3 rx4 50 strip
18 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . evaluation board schematic 1 3 4 5 9 6 7 8 2 10 11 22 20 19 18 14 17 16 15 21 13 12 23 j2 ant c1 33 pf j3 rx4 c2 33 pf j5 rx3 c4 33 pf j7 rx2 c5 33 pf j8 rx1 j4 lb rfin b1 b2 c3* dni c7* dni + c6 4.7 uf + vbatt b3 j9 txen txen r5 0 c12* dni j10 vramp vramp j6 hb rfin u1 rf7115 p1 1 2 3 4 5 6 7 8 p1-1 p1-2 p1-3 p1-4 p1-5 p1-7 p1-8 r6 0 vramp lxen gnd r4 10 k r3 10 k vout1 vout2 error1 error2 vin sd1 sd2 gnd u2 8 7 6 5 1 2 3 4 c10 10 uf c11 10 uf s1 8 7 6 5 1 2 3 4 sw-dip4 r2 10 k r1 10 k b1 b2 b3 1 p3 gnd 1 p2 p2-1
19 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . evaluation board layout board size 2.0? x 2.0? board thickness 0.052?, board material fr-4, multi-layer assembly top inner 1 inner 2
20 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . inner 3 inner 4 back
21 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com . pcb design requirements pcb surface finish the pcb surface finish used for rfmd's qualification process is electroless nickel, immersion gold. typical thickness is 3 inch to 8 inch gold over 180 inch nickel. pcb land pattern recommendation pcb land patterns for rfmd components are based on ipc-735 1 standards and rfmd empirica l data. the pad pattern shown has been developed and tested for optimized assembly at rf md. the pcb land pattern has been developed to accommodate lead and package tolerances. since surface mount processes vary from company to company, careful process development is recommended. pcb metal land and solder mask pattern ordering information rf7115quad-band gsm850/gsm900/dcs/pcs transmit module rf7115sb power amp module 5-piece sample pack blapow er amp module 5-piece sample pack blapower amp module 5-piece sample pack bla RF7115PCBA-41X fully assembled evaluation board dimensions in mm. a = 0.65 sq. typ. b = 2.65 x 2.62 c = 2.05 x 2.25 d = 2.05 x 2.62 e = 2.05 x 2.12 solder mask pattern a c d b a a e a a a a a a a a a a a a a a a a a a a 0.80 typ. 1.28 typ. 3.30 typ. 4.62 typ. 6.30 typ. 0.00 0.00 0.49 0.80 typ. 1.60 typ. 2.40 typ. 3.20 typ. 4.00 typ. 4.80 typ. 5.60 typ. 6.40 typ. 7.20 typ. 6.73 0.86 1.92 typ. 6.27 3.53 typ. 5.15 typ. 7.40 typ. a = 0.50 sq. typ. metal land pattern a a a a a a a a a a a a a a a a 0.42 typ. 5.87 typ. 7.45 typ. 6.81 3.75 0.25 6.55 typ. 0.00 0.80 1.22 0.00 0.42 5.60 6.40 4.80 4.00 0.80 typ. 1.60 typ. 2.40 typ. 3.20 typ.
22 of 22 rf7115 rev a0 ds060808 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or sales-support@rfmd.com .

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