MRF644

2

MOTOROLA RF DEVICE DATA

Characteristic

Symbol

Min

Typ

Max

Unit

ON CHARACTERISTICS

DC Current Gain

(IC = 4.0 Adc, VCE = 5.0 Vdc)

hFE

40

70

100

—

DYNAMIC CHARACTERISTICS

Output Capacitance

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

Cob

—

60

85

pF

FUNCTIONAL TESTS

Common–Emitter Amplifier Power Gain

(VCC = 12.5 Vdc, Pout = 25 W, IC (MAX) = 3.6 Adc, f = 470 MHz)

Gpe

6.2

7.0

—

dB

Input Power

(VCC = 12.5 Vdc, Pout = 25 W, f = 470 MHz)

Pin

—

5.0

6.0

Watts

Collector Efficiency

(VCC = 12.5 Vdc, Pout = 25 W, IC (MAX) = 3.6 Adc, f = 470 MHz)

η

55

60

—

%

Output Mismatch Stress

(VCC = 16 Vdc, Pin = Note 1, f = 470 MHz,

VSWR = 20:1, All Phase Angles)

ψ *

No Degradation in Output Power

Series Equivalent Input Impedance

(VCC = 12.5 Vdc, Pout = 25 W, f = 470 MHz)

Zin

—

1.2 + j3.3

—

Ohms

Series Equivalent Output Impedance

(VCC = 12.5 Vdc, Pout = 25 W, f = 470 MHz)

ZOL

—

1.9 + j2.1

—

Ohms

NOTE:

1. Pin = 150% of Drive Requirement for 25 W Output at 12.5 Vdc.

*

ψ = Mismatch stress factor — the electrical criterion established to verify the device resistance to load mismatch failure. The mismatch stress

test is accomplished in the standard test fixture (Figure 1) terminated in a 20:1 minimum load mismatch at all phase angles.

Figure 1. Test Circuit Schematic

C1, C2, C7, C8 — 1.0 – 20 pF Johanson Variable

C3 — 27 pF 100 mil ATC

C4 — 30 pF 100 mil ATC

C5, C6 — 33 pF 100 mil ATC

C9 — 250 pF 100 mil ATC

C10 — 100 pF UNELCO

C11, C14 — 1.0

µF 35 V TANTALUM

C12, C13 — 680 pF Feedthrough

L1 — 5

″ #22 AWG 0.100″ ID

L2 — 5

″ #20 AWG 0.187″ ID

RFC1 — Ferroxcube VK200–20–4B

B — Ferroxcube Bead 56–590–65–3B

Z1 — 0.25

″ x 0.20″ Microstrip

Z2 — 1.63

″ x 0.20″ Microstrip

Z3 — 0.20

″ x 0.20″ Microstrip

Z4, Z5 — 1/2

″ #18 AWG bent in a

″ Wide

Z6 — 0.20

″ x 0.20″ Microstrip

Z7 — 0.70

″ x 0.20″ Microstrip

Z8 — 0.33

″ x 0.20″ Microstrip

Z9 — 0.50

″ x 0.20″ Microstrip

Board — 62.5 mil Glass Teflon,

εr = 2.55

RFC1

B

C1

C10

Z1

Z2

Z3

Z4

Z5

Z6

Z7

Z8

Z9

C2

C3

C5

C7

C8

C9

C4

C6

L1

C11

C12 C13

C14

B

L2

SOCKET

D.U.T.