Motorola MRF897 Datasheet

1

MRF897MOTOROLA RF DEVICE DATA

The RF Line

 
  

Designed for 24 Volt UHF large–signal, common emitter, class–AB linear
amplifier applications in industrial and commercial FM/AM equipment operating
in the range 800–970 MHz.

• Specified 24 Volt, 900 MHz Characteristics

Output Power = 30 Watts
Minimum Gain = 10 dB @ 900 MHz, class–AB
Minimum Efficiency = 30% @ 900 MHz, 30 Watts (PEP)
Maximum Intermodulation Distortion –30 dBc @ 30 Watts (PEP)

• Characterized with Series Equivalent Large–Signal Parameters from 800

to 960 MHz

• Silicon Nitride Passivated

• 100% Tested for Load Mismatch Stress at all Phase Angles with 5:1 VSWR

@ 26 Vdc, and Rated Output Power

• Gold Metalized, Emitter Ballasted for Long Life and Resistance to Metal–

Migration

• Circuit board photomaster available upon request by contacting

RF Tactical Marketing in Phoenix, AZ.

MAXIMUM RATINGS

Rating Symbol Value Unit

Collector–Emitter Voltage V

CEO

30 Vdc

Collector–Emitter Voltage V

CES

60 Vdc

Emitter–Base Voltage V

EBO

4.0 Vdc

Collector–Current — Continuous I

C

4.0 Adc

Total Device Dissipation @ TC = 25°C

Derate above 25°C

P

D

105

0.60

Watts

W/°C

Storage Temperature Range T

stg

–65 to +150 °C

THERMAL CHARACTERISTICS

Characteristic Symbol Max Unit

Thermal Resistance, Junction to Case R

θJC

1.67 °C/W

ELECTRICAL CHARACTERISTICS (T

C

= 25°C unless otherwise noted.)

Characteristic

Symbol Min Typ Max Unit

OFF CHARACTERISTICS

Collector–Emitter Breakdown Voltage (IC = 50 mAdc, IB = 0) V

(BR)CEO

30 33 — Vdc

Collector–Emitter Breakdown Voltage (IC = 50 mAdc, VBE = 0) V

(BR)CES

60 80 — Vdc

Emitter–Base Breakdown Voltage (IE = 5 mAdc, IC = 0) V

(BR)EBO

4.0 4.7 — Vdc

Collector Cutoff Current (VCE = 30 Vdc, VBE = 0) I

CES

— — 10.0 mAdc

ON CHARACTERISTICS

DC Current Gain (ICE = 1.0 Adc, VCE = 5 Vdc) h

FE

30 80 120 —

DYNAMIC CHARACTERISTICS

Output Capacitance (VCB = 24 Vdc, IE = 0, f = 1.0 MHz) C

ob

14 21 28 pF

(continued)

Order this document

by MRF897/D



SEMICONDUCTOR TECHNICAL DATA



30 W, 900 MHz

RF POWER
TRANSISTOR
NPN SILICON

CASE 395B–01, STYLE 1

 Motorola, Inc. 1994

REV 6

MRF897
2

MOTOROLA RF DEVICE DATA

ELECTRICAL CHARACTERISTICS — continued (T

C

= 25°C unless otherwise noted.)

Characteristic

Symbol Min Typ Max Unit

FUNCTIONAL CHARACTERISTICS

Common–Emitter Amplifier Power Gain

(VCC = 24 Vdc, P

out

= 30 Watts (PEP), Icq = 125 mA, f1 = 900 MHz,

f2 = 900.1 MHz)

G

pe

10.0 12.0 — dB

Collector Efficiency

(VCC = 24 Vdc, P

out

= 30 Watts (PEP), Icq = 125 mA, f1 = 900 MHz,

f2 = 900.1 MHz)

η 35 38 — %

Intermodulation Distortion

(VCC = 24 Vdc, P

out

= 30 Watts (PEP), Icq = 125 mA, f1 = 900 MHz,

f2 = 900.1 MHz)

IMD — –37 –30 dBc

Output Mismatch Stress

(VCC = 26 Vdc, P

out

= 30 Watts (PEP), Icq = 125 mA, f1 = 900 MHz,

f2 = 900.1 MHz, Load VSWR = 5:1 (all phase angles))

ψ No Degradation in Output Power

Before and After Test

Figure 1. MRF897 Broadband Test Circuit

B1, B2, B3, B4 — Ferrite Bead, Fair Rite #2743019447
C1 — 0.8–8.0 pF Trimmer Capacitor, Johanson
C2, C3, C23, C24 — 43 pF, 100 mil, ATC Chip Capacitor
C4, C5, C18, C19, C21, C22 — 820 pF, 100 mil, Chip Capacitor, Kemet
C6, C7, C11, C12 — 10 µF, Lytic Capacitor, Panasonic
C8, C9, C16, C17 — 100 pF, 100 mil, Chip Capacitor, Murata Erie
C10 — 13 pF, 50 mil, ATC Chip Capacitor
C13, C14 — 250 µF Lytic Capacitor, Mallory
C15 — 1.1 pF, 50 mil, ATC Chip Capacitor
C20 — 6.8 pF, 100 mil, ATC Chip Capacitor
L1, L2, L3, L4, L5, L6 — 5 Turns 20 AWG, IDIA 0.126″ choke

N1, N2 — Type N Flange Mount, Omni Spectra 3052–1648–10
Q1 — Bias Transistor BD136 PNP
R1, R12 — 39 Ohm, 2.0 W
R3, R4, R5, R6 — 4.0 x 39 Ohm, 1/8 W, Chips in Parallel,

R3, R4, R5, R6 — Rohm 390–J

TL1–TL11 — See Photomaster
Balun1, Balun2, Coax 1, Coax 2 — 2.20″ 50 Ohm, 0.088″ o.d.

Balun1, Balun2, Coax 1, Coax 2 — semi–rigid coax, Micro Coax
Balun1, Balun2, Coax 1, Coax 2 — UT–85–M17

Board — 1/32″ Glass Teflon, Arlon GX–0300–55–22, εr = 2.55

COAX 1

BALUN 1

INPUT

OUTPUT

BALUN 2

COAX 2

V

CC

V

CC

V

BB

V

BB

TL2

TL1

C1

C2

C3

TL4

TL3

TL5

TL6

C10

L1

L2

B2

C9

R4

C5

R2

Q2

C7

+

L4

D.U.T.

C8

L3

C6

Q1

R1

+

R3

C4

B1

C11 C13 C18

+ +

L5 R5

C21

TL9

B3

L7

C16

TL7

TL8

C15 C20

C23

C24

TL11

TL10

L8

B4

C22

L6

C17

R6

C12 C14 C19

+ +