agilent mga-86576 1.5 8 ghz low noise gaas mmic amplifier data sheet features ?1.6 db noise figure at 4 ghz ?23 db gain at 4 ghz ?+6 dbm p 1db at 4 ghz ?single +5 v bias supply applications ?lna or gain stage for 2.4 ghz and 5.7 ghz ism bands ?front end amplifier for gps receivers ?lna or gain stage for pcn and mmds applications ?c-band satellite receivers ?broadband amplifier for instrumentation schematic diagram description agilents mga-86576 is an economical, easy-to-use gaas mmic amplifier that offers low noise and excellent gain for applications from 1.5 to 8 ghz. the mga-86576 may be used without impedance matching as a high performance 2 db nf gain block. alternatively, with the addition of a simple series inductor at the input, the device noise figure can be reduced to 1.6 db at 4 ghz. the circuit uses state-of-the-art phemt technology with self- biasing current sources, a source- follower interstage, resistive feedback, and on chip impedance matching networks. a patented, on-chip active bias circuit allows operation from a single +5 v power supply. current consumption is only 16 ma. these devices are 100% rf tested to assure consistent performance. surface mount ceramic package rf input 1 24 ground ground rf output and v d 3 pin connections rf output and v d rf input 13 2 4 ground ground 865 attention: observe precautions for handling electrostatic sensitive devices. esd machine model (class a) esd human body model (class 0) refer to agilent application note a004r: electrostatic discharge damage and control.
2 absolute maximum ratings absolute symbol parameter units maximum [1] v d device voltage, rf output v 9 to ground v g device voltage, rf input v +0.5 to ground -1.0 p in cw rf input power dbm +13 t ch channel temperature c 150 t stg storage temperature c -65 to 150 mga-86576 electrical specifications, t c = 25 c, z o = 50 ? , v d = 5 v symbol parameters and test conditions units min. typ. max. gp power gain (|s 21 | 2 ) f = 1.5 ghz db 21.2 f = 2.5 ghz 23.7 f = 4.0 ghz 20 23.1 f = 6.0 ghz 19.3 f = 8.0 ghz 15.4 nf 50 50 ? noise figure f = 1.5 ghz db 2.2 f = 2.5 ghz 1.9 f = 4.0 ghz 2.0 2.3 f = 6.0 ghz 2.3 f = 8.0 ghz 2.5 nf o optimum noise figure f = 1.5 ghz db 1.6 (input tuned for lowest noise f = 2.5 ghz 1.5 figure) f = 4.0 ghz 1.6 f = 6.0 ghz 1.8 f = 8.0 ghz 2.1 p 1db output power at 1 db gain f = 1.5 ghz dbm 6.4 compression f = 2.5 ghz 7.0 f = 4.0 ghz 6.3 f = 6.0 ghz 4.3 f = 8.0 ghz 3.8 ip 3 third order intercept point f = 4.0 ghz dbm 16.0 vswr input vswr f = 1.5 ghz 3.6:1 f = 2.5 ghz 3.3:1 f = 4.0 ghz 2.2:1 3.6:1 f = 6.0 ghz 1.4:1 f = 8.0 ghz 1.2:1 output vswr f = 1.5 ghz 2.5:1 f = 2.5 ghz 2.1:1 f = 4.0 ghz 1.7:1 f = 6.0 ghz 1.4:1 f = 8.0 ghz 1.3:1 i d device current ma 9 16 22 thermal resistance [2] : ch-c = 110 c/w notes: 1. operation of this device above any one of these limits may cause permanent damage. 2. t c = 25 c (t c is defined to be the temperature at the package pins where contact is made to the circuit board).
3 mga-86576 typical scattering parameters [3] , t c = 25 c, z o = 50 ? , v d = 5 v s 11 s 21 s 12 s 22 freq. ghz mag ang db mag ang db mag ang mag ang 0.5 0.57 -21 15.5 5.99 46 -46.5 0.005 -15 0.62 -35 1.0 0.55 -30 19.8 9.72 17 -51.3 0.003 11 0.49 -47 1.5 0.54 -44 21.7 12.15 -7 -51.2 0.003 58 0.43 -57 2.0 0.52 -59 22.8 13.84 -31 -47.0 0.004 85 0.39 -68 2.5 0.48 -77 23.5 14.98 -54 -43.0 0.007 96 0.36 -79 3.0 0.43 -96 23.8 15.56 -77 -39.7 0.010 100 0.33 -92 3.5 0.37 -116 23.7 15.28 -100 -37.0 0.014 99 0.29 -105 4.0 0.30 -137 23.2 14.49 -122 -35.0 0.018 95 0.25 -118 4.5 0.24 -159 22.4 13.18 -142 -33.2 0.022 92 0.21 -130 5.0 0.19 178 21.5 11.82 -160 -31.9 0.026 89 0.19 -139 5.5 0.14 151 20.5 10.54 -177 -30.6 0.030 85 0.14 -151 6.0 0.12 129 19.2 9.14 166 -29.6 0.033 81 0.17 -151 6.5 0.10 111 18.1 8.08 156 -28.7 0.037 82 0.14 -116 7.0 0.08 91 17.5 7.48 142 -27.4 0.042 76 0.08 -158 7.5 0.08 75 16.4 6.64 129 -26.6 0.047 72 0.11 -153 8.0 0.07 64 15.5 5.99 118 -25.8 0.051 69 0.09 -151 8.5 0.06 48 14.7 5.45 107 -25.0 0.056 65 0.09 -146 9.0 0.04 31 14.0 5.03 96 -24.2 0.062 62 0.09 -140 9.5 0.02 18 13.4 4.66 86 -23.4 0.068 58 0.11 -143 10.0 0.01 93 12.7 4.33 76 -22.6 0.074 53 0.11 -154 mga-86576 typical performance, t c = 25 c, z o = 50 ? , v d = 5 v figure 3. matched noise figure vs. frequency. figure 1. power gain vs. frequency at three temperatures. gain (db) 1 30.0 5.0 frequency (ghz) 4710 25.0 20.0 15.0 10.0 23 56 89 -40? +25? +50? nf (db) 1 3.5 1 frequency (ghz) 4710 3 2.5 2 1.5 23 56 89 +50 c -40 c +25 c nf (db) 1 3.5 1 frequency (ghz) 4710 3 2.5 2 1.5 23 56 89 figure 2. 50 ? noise figure vs. frequency at three temperatures. figure 4. p 1db vs. frequency at three temperatures. figure 5. input and output vswr vs. frequency. figure 6. gain, nf 50 , and p 1db vs. temperature at 4 ghz. p 1db (dbm) 1 10.0 0 frequency (ghz) 4710 8.0 6.0 4.0 2.0 23 56 89 -40 c +25 c +50 c vswr 1 4.0 1.5 frequency (ghz) 4710 3.5 3.0 2.5 2.0 23 56 89 output 1.0 input gain and nf (db) -40 25 0 temperature c -20 0 50 20 15 10 5 -30 -10 25 power gain noise figure p 1db (dbm) p 1db 0 +5 +10
4 mga-86576 typical noise parameters [3] , t c = 25 c, z o = 50 ? , v d = 5 v opt frequency nf o ghz db mag. ang. r n /50 ? 1.0 2.1 0.56 27 0.43 1.5 1.6 0.54 31 0.40 2.5 1.5 0.47 40 0.36 4.0 1.6 0.38 54 0.32 6.0 1.8 0.28 77 0.28 8.0 2.1 0.22 107 0.25 [3] reference plane taken at point where leads meet body of package. figure 7. layout for mga-86576 demonstration amplifier. pcb dimensions are 1.18 inches wide by 1.30 inches high. recommend using the mga-86576 mmic on boards thicker than 0.040 inch. the effects of inductance asso- ciated with the board material are easily analyzed and very predict- able. as a minimum, the circuit simulation should consist of the data sheet s-parameters and an additional circuit file describing the plated through holes and any additional inductance associated with lead length between the device and the start of the plated through hole. to obtain a complete analysis of the entire amplifier circuit, the effects of the input and output microstriplines and bias decoupling circuits should be incorporated into the circuit file. device connections v d and rf output (pin 3) rf and dc connections are shown in figure 8. dc power is provided to the mmic through the same pin used to obtain rf output. a 50 ? microstripline is used to connect the device to the following stage or output connector. a bias decoupling network is used to feed in v dd mga-86576 applications information introduction the mga-86576 is a high gain, broad band, low noise amplifier. the use of plated through holes or an equivalent minimal inductance grounding technique placed precisely under each ground lead at the device is highly recom- mended. a minimum of two plated through holes under each ground lead is preferred with four being highly suggested. a long ground path to pins 2 and 4 will add additional inductance which can cause gain peaking in the 2 to 4 ghz frequency range. this can also be accompanied by a decrease in stability. a suggested layout is shown in figure 7. the circuit is designed for use on 0.031 inch thick fr-4/g-10 epoxy glass dielectric material. printed circuit board thickness is also a major consideration. thicker printed circuit boards dictate longer plated through holes which provide greater undesired inductance. the para- sitic inductance associated with a pair of plated through holes passing through 0.031 inch thick printed circuit board is approximately 0.1 nh, while the inductance of a pair of plated through holes passing through 0.062 inch thick board is about 0.2 nh. agilent does not 100-1000 pf c1 v dd high z 10-100 ? 27 pf 50 ? 50 ? 50 ? 50 ? 4 2 3 1 27 pf l1 r1 figure 8. demonstration amplifier schematic.
5 while simultaneously providing a dc block to the rf signal. the bias decoupling network shown in figure 8, consisting of resistor r1, a short length of high impedance microstripline, and bypass capacitor c1, provides the best overall performance in the 2 to 8 ghz frequency range. the use of lumped inductors is not desired since they tend to radiate and cause undesired feedback. moving the bypass capacitor, c1, down the micro- stripline towards the v dd terminal, as shown in figure 9, will improve the gain below 2 ghz by trading off some high end gain. a minimum value of 10 ? for r1 is ground (pins 2 and 4) ground pins should attach directly to the backside ground plane by the shortest distance possible using the design hints suggested in the earlier section. liberal use of plated through vias is recommended. rf input (pin 1) a 50 ? microstripline can be used to feed rf to the device. a blocking capacitor in the 10 pf range will provide a suitable dc block in the 2 to 6 ghz frequency range. although there is no voltage present at pin 1, it is highly suggested that a dc blocking capacitor be used to prevent accidental application of a voltage from a previous amplifier stage. with no further input matching, the mga-86576 is capable of noise figures as low as 2 db in the 2 to 6 ghz frequency range. since o is not 50 ? , it is possible to design and implement a very simple matching network in order to improve noise figure and input return loss over a narrow frequency range. the circuit board layout shown in figure 7 provides an option for tuning for a low noise match anywhere in the 1.5 to 4 ghz frequency range. for optimum noise figure performance in the 4 ghz frequency range, l1 can be a 0.007 inch diameter wire 0.080 inches in length as shown in figure 9. alternatively, l1 can be replaced by a 0.020 inch wide microstripline whose length can be adjusted for minimum noise figure in the 1.5 to 4 ghz frequency range. table 1 provides the approximate inductor length for minimum noise figure at a given frequency for the circuit board shown in figure 7. 7 volt bias for operation at higher temperatures the mga-86576 was designed primarily for 5 volt operation over the -25 to +50 c temperature range. for applications requiring use to +85 c, a 7 volt bias supply is recommended to minimize changes in gain and noise figure at elevated temperature. figure 10 shows typical gain, noise figure, and output power performance over temperature at 4 ghz with 7 volts applied. with a 7 volt bias supply, output power is increased approximately 1.5 db. other parameters are relatively unchanged from 5 volt data. s-parameter and noise parameter data for 7 volts are available upon request from agilent. figure 9. complete mga-86576 demonstration amplifier. recommended to de-q the bias decoupling network, although 100 ? will provide the highest circuit gain over the entire 1.5 to 8 ghz frequency range. v dd will have to be increased accordingly for higher values of r1. for operation in the 2 to 6 ghz frequency range, a 10 pf capacitor may be used for dc blocking on the output microstripline. a larger value such as 27 pf is more appro- priate for operation at 1.5 ghz. table 1. l1 length vs. frequency for optimum noise figure. frequency length ghz inches 1.5 0.70 1.8 0.60 2.1 0.50 2.4 0.40 2.5 0.30 3.0 0.20 3.7 0.10 4.0 0.05
printed circuit board materials most commercial applications dictate the need to use inexpen- sive epoxy glass materials such as fr-4 or g-10. unfortunately the losses of this type of material can become excessive above 2 ghz. as an example, a 0.5 inch long 50 ? microstripline etched on fr-4 along with a blocking capacitor has a measured loss of 0.35 db at 4 ghz. the 0.35 db loss adds directly to the noise figure of the mga-86576. the use of a low loss ptfe based dielectric material will preserve the inherent low noise of the mga-86576. db or de -40 25 0 temperature c -20 0 50 20 15 10 5 -30 -10 25 power gain noise figure p 1db 85 125 figure 10. gain, nf 50 , and p 1db vs. temperature at 4 ghz with 7 volt bias supply. package dimensions 76 package 1.02 (0.040) .51 (0.20) 1.78 (0.070) 1.22 (0.048) .53 (0.021) 5.28 (0.208) 0.10 (0.004) typical dimensions are in millimeters (inches). www.agilent.com/semiconductors for product information and a complete list of distributors, please go to our web site. for technical assistance call: americas/canada: +1 (800) 235-0312 or (916) 788-6763 europe: +49 (0) 6441 92460 china: 10800 650 0017 hong kong: (65) 6756 2394 india, australia, new zealand: (65) 6755 1939 japan: (+81 3) 3335-8152(domestic/international), or 0120-61-1280(domestic only) korea: (65) 6755 1989 singapore, malaysia, vietnam, thailand, philippines, indonesia: (65) 6755 2044 taiwan: (65) 6755 1843 data subject to change. copyright ? 2005 agilent technologies, inc. obsoletes 5989-1802en april 11, 2005 5989-2888en part number ordering information no. of part number devices container MGA-86576-TR1 3000 7" reel mga-86576-tr2 10000 13" reel mga-86576-blk 100 antistatic bag
|
