March 1993

12

Philips Semiconductors

Product specification

UHF power transistor

BLU99

BLU99/SL

Fig.16 Printed circuit board and component layout for a 900 MHz test circuit.

handbook, full pagewidth

VCC

128.5 mm

80 mm

rivets

E

E

soldered

copperstraps

E

E

C1

C12

C2

C13

C9

C3

L3

C4

C7

C8

L9

R2

C10

C11

R1

L4

L8

C5

C6

BC

BC

MDA383

The circuit and the components are on one side of the P.T.F.E. fibre-glass board; the other side is unetched copper to serve as a

ground plane. Earth connections are made by hollow rivets and also by fixing screws and copper straps around the board and under

the emitters to provide a direct contact between the copper on the component side and the ground plane.

RUGGEDNESS

The device is capable of withstanding a load mismatch

with VSWR = 50 (all phases) up to a supply voltage of

15,5 V at rated load power.