May 1991

7

Philips Semiconductors

Product specification

UHF power transistor

BLT53

List of components (see test circuit)

Note

1. The striplines are mounted on a double copper-clad printed circuit board, with PTFE fibre-glass dielectric (

ε

COMPONENT

DESCRIPTION

VALUE

DIMENSIONS

CATALOGUE NO.

C1, C2, C7, C8

film dielectric trimmer

2 to 9 pF

2222 809 09002

C3, C4

multilayer ceramic chip capacitor

15 pF

C5

feed-through capacitor

100 pF

C6

polyester capacitor

33 nF

L1

stripline (note 1)

44

Ω

41.1 mm

× 5 mm

L2

13 turns closely wound enamelled

0.5 mm copper wire

320 nH

int. dia. 4 mm

L3

2 turns enamelled 1 mm copper wire

int. dia. 4 mm;

pitch 1.5 mm;

leads 2

× 5 mm

L4

stripline (note 1)

44

Ω

52.7 mm

× 5 mm

L5

grade 3B1 Ferroxcube wideband HF

choke

4312 020 36640

R1

0.25 W carbon resistor

1

Ω,5%

R2

0.25 W carbon resistor

10

Ω,5%

Fig.9 Class-B test circuit at f = 470 MHz.

handbook, full pagewidth

MBH107

R2

T.U.T.

L5

C6

L4

C7

C8

L3

C5

C4

C3

C1

C2

L1

R1

L2

,,

,,

ZL = 50 Ω

output

ZS = 50 Ω

input

+VCC