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the JUPITER circuit is designed for use in dual band and dual mode mobile phones (cdma/amps) and meets the requirements for is-95 when used with other chips from mitel that form the planet chipset. JUPITER is an active filter incorporating circuits for receiving both cdma and fm (amps). features n low power and low voltage operation with a sleep mode n integrated cdma and fm filter with wide dynamic range n low inband gain ripple performance and good i/q matching for the filter JUPITER cdma and fm (amps) i/q filter preliminary information ds4724 - 3.1 may 1998 absolute maximum ratings supply voltage, v cc max operating temperature, t op (at pins) storage temperature, t stg (ambient) junction temperature cmos input logic high, v ih cmos input logic low, v il maximum input voltage at all pins ordering information JUPITER-1/kg/np1s 2 07v to 1 53v 2 30 c to 1 70 c 2 40 c to 1 150 c 2 30 c to 1 125 c v cc 1 06v (max.) 2 06v (min.) 2 06v to v cc max 1 06v esd protection all pins are protected against electrostatic discharge to both supplies. at least 2kv protection is provided to mil-std-883d method 3015.7 (human body model). fig. 1 pin connections - top view np28 q_oc_test q_oc_testb qin qinb q_offset q_offsetb v test rtune itune qtune qbal qout qoutb v cc i_oc_test i_oc_testb iin iinb i_offset i_offsetb v ee mode_cdma enable entest v ref iout ioutb v ee 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 JUPITER fig. 2 simplified block diagram gain control mode control iin qin iout qout mode select inputs tune controls filter control qbal v gc i channel q channel
JUPITER 2 circuit description the block diagram of the JUPITER filter is shown in fig. 3. two tunable active low-pass gyrator filters are designed with balanced i/q inputs and outputs. cdma mode in cdma mode the filter (f1 on fig. 3) is a 7th order 0.1db ripple continuously tunable elliptic type with the corner frequency tuned to 690khz for best stop band attenuation and minimal phase error (in the overall system). variable gain stages after the filter provide the gain control capability. overall, each of the cdma i/q channels has 45db nominal voltage gain with the q channel having 2db gain adjustment range. separate i/q frequency tuning functions are built into the device. fm mode in fm mode the same filter is used; however, the biasing is designed such that the current density in the transconductor cells is reduced by a factor of 46, changing the filters cutoff frequency to 15khz. the filter characteristic of the main channel filter (gyrator filter) remains the same, i.e. a 0.1db 7th order elliptic. in fm mode additional 2nd order sallen and key 0.1db ripple chebeyshev filters (f2) are included in the signal path prior to the gyrators. these improve the out-of-band blocking of the overall filter. different amplifiers are used in fm mode to those used in cdma mode to enable optimization of the gain distribution in fm mode for current consumption and dynamic range. operation signal inputs are dc coupled in both cdma and fm modes. the device modes are selected by cmos compatible logic signals as shown in table 2. an external resistor should be connected between rtune and ground to set internal currents; a resistor with a tolerance of 6 5% and a temperature coefficient of less than 100ppm is recommended. v ref (pin 18) should be decoupled to v cc to give optimum supply rejection. a test mode is provided for filter calibration. in this mode, a test signal is applied to the v test input (pin 7) with entest held high. the test mode is designed to interface with the pluto baseband processor, which can provide the test signal and i/qtune voltages and calibrates the filters using an internal auto calibration algorithm. the algorithm generates two test frequencies and calibrates the filters to give the correct attenuation at the upper frequency. the calibration is normally carried out in cdma mode: the fm filter performance is scaled accordingly. pins are provided for dc offset control for i and q channels (i_offset, i_offsetb, q_offset and q_offsetb). in typical operation, the i_offset/q_offset pins would be controlled by a voltage derived from the baseband processor. however, it is also possible to minimise the dc offset using external components; this is primarily intended for test purposes. these feedback components between iout/qout and i_offset/q_offset are shown in fig. 4 but would not be used in the normal application in test mode, these offset controls are disabled and the offsets are controlled using on-chip feedback. the loop filter for this feedback uses external 10nf capacitors on pins i_oc_test/b and q_oc_test/b as shown in fig. 4. i/o i i i i i i i i i i o o p p o o i i i p i i i i i i description q channel offset control in test mode q channel offset control in test mode (balanced) q channel cdma/fm input. q channel cdma/fm input (balanced) q channel offset control q channel offset control (high gain mode) test mode signal input for tuning operation precision resistor for current definition (18k) i filter tuning control q filter tuning control q channel gain adjust voltage, vgc q channel cdma/fm output q channel cdma/fm output (balanced) supply ground i channel cdma (balanced) i channel cdma reference voltage decouple mode control (see table 2) mode control (see table 2) mode control (see table 2) ground (substrate) i channel offset control (high gain mode) i channel offset control i channel cdma (balanced) i channel cdma i channel offset control in test mode (balanced) i channel offset control in test mode name q_oc_test q_oc_testb qin qinb q_offset q_offsetb v test rtune itune qtune qbal qout qoutb v cc v ee 2 ioutb iout v ref entest enable mode_cdma v ee i_offsetb i_offset iinb iin i_oc_testb i_oc_test pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 table 1 pin descriptions
JUPITER 3 fig. 3 block diagram all circuits powered down biasing and cdma signal path on biasing and fm signal path on biasing, cdma test and cdma signal path on, excluding input amplifier biasing, fm test and fm signal path on, excluding input amplifier. this is functionally the same as sleep mode but has higher i cc . in sleep mode pluto applies a logic high to entest enable mode_ cdma sleep mode cdma mode fm mode cdma filter testmode fm filter test mode disallowed mode 0 1 1 1 1 0 x 1 0 1 0 x 1 0 0 1 1 0 description entest comments table 2 truth table for mode control lines entest enable mode_cdma qin qinb mode control attenuator q channel 2db 50k q_offset q_offsetb gm -01 db gm gm gm gm gm iin iinb v test i_offset i_offsetb gm gm -01 db filter control qtune rtune itune qout qoutb iout ioutb qbal 50k gm q_oc_testb q_oc_test i_oc_testb i_oc_test x1 x1 3 4 26 25 19 20 21 7 24 23 5 6 12 28 27 12 13 11 17 16 10 8 9 v ee 2 v ee v cc v ref attenuator 15 22 14 18 f3 f3 f1 f1 f2 f2 v gc
JUPITER 4 electrical characteristics the electrical characteristics are guaranteed over the following range of operating conditions unless otherwise stated (see fig. 4 for test circuit): t amb = 2 30 c to 1 70 c, v cc = 3v 1 06v/ 2 03v dc characteristics characteristic conditions general supply voltage, v cc operating temperature, t amb supply current, i cc sleep mode fm mode cdma mode turn off time, cdma/fm mode to sleep mode mode control lines (cmos) input logic high, v ih input logic low, v il input high current i ih input low current, i il tune/gain control lines dc level input impedances: qbal, itune and qtune i_offset/b and q_offset/b i/o dc voltages inputs iin/b and qin/b outputs iout/b and qout/b 27 2 30 20 2 01 2 20 2 20 05 v cc 2 06 v cc 2 16 36 1 70 015 52 110 v cc 1 01 05 20 20 20 v cc 2 02 v cc 2 12 30 34 73 100 200 500 v cc 2 04 v cc 2 14 qbal = itune = qtune <05v qbal = itune = qtune = 12v qbal = itune = qtune = 12v i cc reduced to 10% of active value referenced to on-chip ref. voltage (12v) v c ma ma ma m s v v m a m a v k w k w v v units min. typ. max. value % all logic inputs
JUPITER 5 electrical characteristics fm mode ac characteristics all parameters are defined as differential unless otherwise stated characteristic conditions 10 43 a v 1 15 80 1 075 6 025 45 195 5 10 10 14 40 12 external load = 50k w //5pf qbal = 12v qbal = 05 to 2v v cc = 6 150mv measured at i/q output frequency = 10khz measured at i/q output frequency = 630khz bandwidth = 10hz to 5mhz. i and q channels frequency = 2khz in-band frequency = 2khz. all conditions 27 c only in-band frequency = 2khz. all conditions 27 c only unmodulated interferers 60khz 75mvrms, 120khz 75mvrms itune = qtune = 12v frequency = 100hz to 122khz settling to within 5mv settling to within 5mv frequency = 2khz frequency = 2khz mhz db db db/v db db db db m vrms vp-p mvrms mvrms mvrms mvrms dbv m vrms khz db db % dbp-p m s deg v/v v/v ms ms k w k w units max. value 41 40 10 0 30 19 380 380 2 101 88 165 63 70 30 10 10 40 10 10 typ. 39 a v 2 15 6 2 2 075 15 266 266 145 48 60 06 80 min. maximum input frequency gain characteristics i voltage gain (a v ) iin/b to iout/b q voltage gain qin/b to qout/b q channel gain adjust q channel gain control gain variation over temperature and supply voltage differential output amplitude balance, qout/qoutb, iout/ioutb power supply rejection in-band out of band noise input referred 1db compression output 1db compression out of band blocking signal causing 1db compression of in-band signal blocking signal at 60khz blocking signal at 120khz intermodulation input referred intermodulation product filter characteristic (note 1) 3db pass band stop band attenuation 45khz stop band attenuation 60khz to 10mhz i and q bandwidth matching in-band gain ripple group delay variation average phase balance, i and q channels offset loop correction filter offset adjustment gain: i_offset/q_offset i_offset b/q_offsetb amplifier offset settling time: after power on after cdma to fm cycling input impedances qin/qinb and in/inb output impedances qout/qoutb and iout/ioutb note 1. filter tuned in cdma mode to 2 8db at 720khz %
JUPITER 6 electrical characteristics cdma mode ac characteristics all parameters are defined as differential unless otherwise stated characteristic conditions 10 47 a v 1 15 80 1 075 6 025 2 848 57 2 848 57 20 1 3 4 10 3 mhz db db db/v db db db m vrms vp-p mvrms mvrms mvrms mvrms dbv m vrms dbv m vrms dbv m vrms dbv m vrms v % khz/v db % dbp-p deg units max. value 45 40 20 110 19 150 150 2 101 88 2 101 88 12 0 240 55 typ. 43 a v 2 15 6 2 2 075 15 110 110 05 2 3 50 min. maximum input frequency gain characteristics i voltage gain (a v ) iin/b to iout/b q voltage gain qin/b to qout/b q channel gain adjust q channel gain control gain variation over temperature and supply voltage differential output amplitude balance, qout/qoutb, iout/ioutb power supply rejection in-band noise input referred 1db compression output 1db compression out of band blocking signal causing 1db compression of in-band signal blocking signal at 60khz blocking signal at 120khz intermodulation input referred intermodulation product input referred intermodulation product filter characteristic (note 1) itune/qtune voltage pass band variation over supply and temperature variation i/q tuning gain stop band attenuation 900khz to 10mhz i and q bandwidth matching in-band gain ripple average phase balance, i and q channels external load = 50k w //5pf qbal = 12v qbal = 05 to 2v v cc = 6 150mv measured at i/q output frequency = 690khz bandwidth = 10hz to 5mhz. i and q channels frequency = 2khz in-band frequency = 100khz. all conditions 27 c only in-band frequency = 100khz. all conditions 27 c only unmodulated interferers 900khz 24mvrms, 1700khz 15mvrms 27 c only unmodulated interferers 125mhz 24mvrms, 225mhz 15mvrms 27 c only tuning voltage to set filter to 2 8db at 720khz relative to 350khz v cc = 6 150mv itune = qtune = 12v frequency = 1khz to 630khz frequency = 1khz to 630khz note 1. filter tuned to 2 8db at 720khz relative to 350khz cont
JUPITER 7 electrical characteristics cdma mode ac characteristics (continued) characteristic conditions 28 10 40 12 v/v v/v ms ms k w k w units max. value 20 20 10 10 typ. 12 80 min. offset loop correction filter offset adjustment gain: i_offset/q_offset i_offset b/q_offsetb amplifier offset settling time: after power on after fm to cdma cycling input impedances qin/qinb and in/inb output impedances qout/qoutb and iout/ioutb settling to within 6mv settling to within 6mv frequency = 2khz frequency = 2khz fig. 4 test circuit v cc qin qinb q_offset q_offsetb q_oc_test q_oc_testb qout qoutb qbal mode_cdma v cc v test en_test enable iin iinb i_offset i_offsetb i_oc_test i_oc_testb iout ioutb 100n 100k 100k qtune qin qout 100n 100k 100k iin iout itune rtune v ee v ee 2 220n 18k v ref 1n 100n JUPITER 10n 10n 10n 10n v cc v cc
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