MMT2857 MOTOROLA | Alldatasheet
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MOTOROLA SC {DIODES/OPTO} 34 pe Jeaeress 0038215 1 Tt : | 68367255 MOTOROLA SC (DIODES/OPTO) 34C 38215 D MICRO-T (continued) ser MMT2857,A — nen : RF AMPLIFIER TRANSISTORS . E | Len © designed for high-gain, low-noise amplifier, oscillator and t ToP mixer applications. . VIEW B Cc Case 28 Pin 1, Base STYLE1 2. Emitter i 3. Collector i MAXIMUM RATINGS ! [Rating Symbor [Value [unit | [Goecorritervatage | Vee [15 | var |Cotector Base Votage | Ven | |v | [Emiter-Base Votage | Ven | 8.0 | So —_—i [cotecor Curent |e | 40 | ans | Derate above 25°C mWPC ; Temperature Range : ELECTRICAL CHARACTERISTICS (T, = 25°C unless otherwise noted) * Epeameter [Tost Gontn ino OFF CHARACTERISTICS. RR | BV |ie=t0nAdsie=o | | CMe | | [Ve e=1nAdtle=0 | 80 |S CC‘ | ee Ner= 186 p= 0 i ON CHARACTERISTIC a DYNAMIC CHARACTERISTICS Ic = 5.0 mAde, Vog = 6.0 Vdc, f = 100MHz — MMT2857A! 1,000 Ic = 1.5 mAdc, Vog = 6.0 Vdc,f = 100MHz __MMT2857A| 750 | fp Rammeremenes Tete | f = 450 MHz MMT2857A| FUNCTIONAL TEST [Ge Jig = 18 mAde, Vee = GOVEc.t = 450MHz wMT2asrA] 10 T — | | | continued i 14-23 ee (Ee
MOTOROLA SC {DIODES/OPTO> 34 DeBese7e55 oozs2u 3 9 { 6367255 MOTOROLA SC (DIODES/OPTO) 34C 38216 D MICRO-T (continued) MMT2857,A (continued) TB -(7 FIGURE 1— TEST CIRCUIT FOR NOISE FIGURE AND POWER GAIN t ‘Capacitance vaiues in pF i L1, L2. — Silver-plated brass rod, 1-1/2" long and 1/4” dia. Install at least . 1/2" from nearest vertical chassis surface, | L3 — 1/2 turn #16 AWG wire, located 1/4” from and parallel to L2. | 1 — External interlead shield to isolate collector lead from emitter ! and base leads. j Neutralization Procedure: i | (A) Connect 450 MHz signal generator (with Rg = 50 ohms) to input terminals of amplifier. ! (8) Connect 50-ohm RF voltmeter across output terminals of amplifier. i (c) Apply Vee, and with signal generator adjusted for 5 mV output | from amplifier, tune C1, C3, and C4 for maximum output. I (0) Interchange connections to signal generator and RF voltmeter. + (E) With sufficient signa! applied to output terminals of amplifier, wien de for minimum indication at input (F) Repeat steps (A), (B), and (C) to determine if retuning is necessary. 3 L2 . © B 0.35.0 4 > = 4 Vout Rg = 502 500 Ae 3. 5 v ni) be in 7 0.3-5.0 i ct 1+ | Lr Jo8s.0 ca | + 0.8-8.0 tT Tt” 68k ee - = Veg "77.5 Vde | . 14-24 ee