MRF421

2

MOTOROLA RF DEVICE DATA

Characteristic

Symbol

Min

Typ

Max

Unit

ON CHARACTERISTICS

DC Current Gain

(IC = 5.0 Adc, VCE = 5.0 Vdc)

hFE

10

70

—

—

DYNAMIC CHARACTERISTICS

Output Capacitance

(VCB = 12.5 Vdc, IE = 0, f = 1.0 MHz)

Cob

—

550

800

pF

FUNCTIONAL TESTS

Common–Emitter Amplifier Power Gain

(VCC = 12.5 Vdc, Pout = 100 W, IC(max) = 10 Adc,

ICQ = 150 mAdc, f = 30, 30.001 MHz)

GPE

10

12

—

dB

Collector Efficiency

(VCC = 12.5 Vdc, Pout = 100 W, IC(max) = 10 Adc,

ICQ = 150 mA, f = 30, 30.001 MHz)

η

40

—

—

%

Intermodulation Distortion (1)

(VCE = 12.5 Vdc, Pout = 100 W, IC = 10 Adc,

ICQ = 150 mA, f = 30, 30.001 MHz)

IMD

—

–33

–30

dB

NOTE:

1. To proposed EIA method of measurement. Reference peak envelope power.

Figure 1. 30 MHz Test Circuit Schematic

C1, C2, C4 — 170 – 780 pF, ARCO 469

C3 — 80 – 480 pF, ARCO 466

C5, C7, C10 — ERIE 0.1

µF, 100 V

C6 — MALLORY 500

µF @ 15 V Electrolytic

C9 — 100

µF, 15 V Electrolytic

C8 — 1000 pF, 350 V UNDERWOOD

R1 — 10

Ω, 25 Watt Wirewound

R2 — 10

Ω, 1.0 Watt Carbon

CR1 — 1N4997

L1 — 3 Turns, #16 Wire, 5/16

″ I.D., 5/16″ Long

L2 — 12 Turns, #16 Enameled Wire Closewound, 1/4

″ I.D.

L3 — 1–3/4 Turns, 1/8

″ Tubing, 3/8″ I.D., 3/8″ Long

L4 — 10

µH Molded Choke

L5 — 10 Ferrite Beads — FERROXCUBE #56–590–65/3B

+

BIAS

–

RF

INPUT

RF

OUTPUT

12.5 Vdc

+

–

R1

CR1

C5

C6

L4

L2

C7

C8

L5

C9

C10

C4

L3

C3

R2

C1

C2

L1

D.U.T.