MRF137 Datasheet, PDF (5/9 Pages) Motorola, Inc – N-CHANNEL MOS BROADBAND RF POWER FET

RF
INPUT
C5
BIAS
ADJUST
R3
R2
Z1
Z2
C1
C6
R4
C10 C11
D1
+
-
C9 ^RFC1
R1
Z4
Z3
DUT
C7
C2
RFC2
C12
C13
V_DD = 28 V
Z5
C3
C8
Z6
RF
OUTPUT
C4
C1, C2, C3, C4 — 0–20 pF Johanson, or equivalent
C5, C8 — 270 pF, 100 Mil Chip
C6, C7 — 24 pF Mini–Unelco, or equivalent
C9 — 0.01 µF, 100 V, Disc Ceramic
C10 — 100 µF, 40 V
C11 — 0.1 µF, 50 V, Disc Ceramic
C12, C13 — 680 pF Feedthru
D1 — 1N5925A Motorola Zener
R1, R2 — 10 kΩ, 1/4 W
R3 — 10 Turns, 10 kΩ
R4 — 1.8 kΩ, 1/2 W
Z1 — 2.9″ x 0.166″ Microstrip
Z2, Z4 — 0.35″ x 0.166″ Microstrip
Z3 — 0.40″ x 0.166″ Microstrip
Z5 — 1.05″ x 0.166″ Microstrip
Z6 — 1.9″ x 0.166″ Microstrip
RFC1 — 6 Turns, 0.300″ ID, #20 AWG Enamel, Closewound
RFC2 — Ferroxcube VK–200 — 19/4B
Board — Glass Teflon, 62 Mils
Figure 14. 400 MHz Test Circuit
REV 6
5
Z_{in 150}
f = 100 MHz
200
400
400
200
150 ^ZOL*
f = 100 MHz
V_DD = 28 V, I_DQ = 25 mA,
P_out = 30 W
f
Z_in{
MHz
Ohms
Z_OL*
Ohms
100
2.11 - j11.07
8.02 - j2.89
150
1.77 - j7.64ă
5.75 - j3.02
200
1.85 - j3.75ă
3.52 - j2.67
400
1.74 + j3.62ă
2.88 - j1.52
Z_OL* = Conjugate of the optimum load impedance
into which the device output operates at a given outĆ
put power, voltage and frequency.
Figure 15. Large–Signal Series Equivalent Input and Output Impedance, Z_in, Z_OL*