MRF455
2MOTOROLA RF DEVICE DATA
ELECTRICAL CHARACTERISTICS — continued (TC = 25°C unless otherwise noted.)
Characteristic UnitMaxTypMinSymbol
FUNCTIONAL TESTS (Figure 1)
Common–Emitter Amplifier Power Gain
(VCC = 12.5 Vdc, Pout = 60 W, f = 30 MHz) Gpe 13 — — dB
Collector Efficiency
(VCC = 12.5 Vdc, Pout = 60 W, f = 30 MHz) η55 — — %
Series Equivalent Input Impedance
(VCC = 12.5 Vdc, Pout = 60 W, f = 30 MHz) Zin — 1.66–j.844 — Ohms
Series Equivalent Output Impedance
(VCC = 12.5 Vdc, Pout = 60 W, f = 30 MHz) Zout — 1.73–j.188 — Ohms
Parallel Equivalent Input Impedance
(VCC = 12.5 Vdc, Pout = 60 W, f = 30 MHz) Zin — 2.09/1030 — Ω/pF
Parallel Equivalent Output Impedance
(VCC = 12.5 Vdc, Pout = 60 W, f = 30 MHz) Zout — 1.75/330 — Ω/pF
Figure 1. 30 MHz Test Circuit Schematic
f = 30 MHz
P , OUTPUT POWER (WATTS)
out
80
Pin, INPUT POWER (WATTS)
0
70
60
50
40
01 2 3 4 5
30
20
10
P , OUTPUT POWER (WATTS)
out
VCC, SUPPLY VOLTAGE (VOLTS)
0.5 1.5 2.5 3.5 4.5
VCC = 13.6 V 80
70
60
50
40
30
20
10
f = 30 MHz
12.5 V
Pin = 3.5 V
1 W
1.75 W
8 10 12 14 16 18
9 11 13 15 17
L3
R1
C5 C6 C7 C8
RF OUTPUT
L4
C4
C1
C2 L2
DUT
C3
L1
–
+
12.5 Vdc
L5
RF INPUT
C1, C2, C4 — ARCO 469
C3 — ARCO 466
C5 — 1000 pF, UNELCO
C6, C7 — 0.1 µF Disc Ceramic
C8 — 1000 µF/15 V Electrolytic
R1 — 10 Ohm/1.0 Watt, Carbon
L1 — 3 Turns, #18 AWG, 5/16″ I.D., 5/16″ Long
L2 — VK200–20/4B, FERROXCUBE
L3 — 12 Turns, #18 AWG Enameled Wire, 1/4″ I.D., Close Wound
L4 — 3 Turns 1/8″ O.D. Copper Tubing, 3/8″ I.D., 3/4″ Long
L5 — 7 FERRITE Beads, FERROXCUBE #56–590–65/3B
90
Figure 2. Output Power versus Input Power Figure 3. Output Power versus Supply Voltage