September 1992

9

Philips Semiconductors

Product specification

HF power MOS transistor

BLF145

List of components (class-AB test circuit)

Notes

1. American Technical Ceramics (ATC) capacitor, type 100B or other capacitor of the same quality.

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

COMPONENT

DESCRIPTION

VALUE

DIMENSIONS

CATALOGUE NO.

C1, C2

film dielectric trimmer

5 to 60 pF

2222 809 07011

C3, C6

multilayer ceramic chip capacitor

100 nF

2222 852 47104

C4, C5

multilayer ceramic chip capacitor

(note 1)

27 pF

C7, C10

multilayer ceramic chip capacitor

(note 1)

39 pF

C8, C9

film dielectric trimmer

7 to 100 pF

2222 809 07015

C11

multilayer ceramic chip capacitor

3

× 100 nF

2222 852 47104

C12

electrolytic capacitor

2.2

µF, 63 V

2222 030 38228

L1

13 turns enamelled 0.5 mm copper

wire

415 nH

length 10 mm;

int. dia. 5 mm

L2, L3

stripline (note 2)

30

Ω

length 15

× 6mm

L4

10 turns enamelled 1 mm copper

wire

390 nH

length 13 mm;

int. dia. 7 mm

L5

9 turns enamelled 1 mm copper wire 245 nH

length 10 mm;

int. dia. 5 mm

L6

grade 3B Ferroxcube wideband HF

choke

4312 020 36640

R1

0.5 W metal film resistor

34

Ω

R2

0.25 W metal film resistor

10

Ω

Fig.14 Test circuit for class-AB operation.

f = 28 MHz.

handbook, full pagewidth

MGP045

input

50

Ω

C1

C3

C6

L1

L2

D.U.T.

L3

L5

+VG

L4

R1

C2

C8

C11

C5

C4

C7

C12

C10

+VD

C9

L6

R2

output

50

Ω