September 1992

7

Philips Semiconductors

Product specification

HF power MOS transistor

BLF145

List of components (class-A 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 (

ε

COMPONENT

DESCRIPTION

VALUE

DIMENSIONS

CATALOGUE NO.

C1, C3, C8, C9

film dielectric trimmer

7 to 100 pF

2222 809 07015

C2, C10

multilayer ceramic chip capacitor

(note 1)

39 pF

C4, C7

multilayer ceramic chip capacitor

100 nF

2222 852 47104

C5, C6

multilayer ceramic chip capacitor

(note 1)

27 pF

C11

multilayer ceramic chip capacitor

3

× 100 nF

2222 852 47104

C12

electrolytic capacitor

2.2

µF, 63 V

2222 030 38228

L1

12 turns enamelled 0.5 mm copper

wire

307 nH

length 8 mm;

int. dia. 4 mm

L2, L3

stripline (note 2)

30

Ω

length 15

× 6mm

L4

14 turns enamelled 1 mm copper

wire

1039 nH

length 14 mm;

int. dia. 9 mm

L5

9 turns enamelled 1 mm copper wire 305 nH

length 10 mm;

int. dia. 6 mm

L6

grade 3B Ferroxcube wideband HF

choke

4312 020 36640

R1

0.25 W metal film resistor

26

Ω

R2

0.25 W metal film resistor

10

Ω

Fig.11 Test circuit for class-A operation.

f = 28 MHz.

handbook, full pagewidth

MGP042

input

50

Ω

C1

C4

C7

L1

L2

D.U.T.

L3

L5

+VG

L4

R1

C3

C2

C8

C11

C6

C5

C12

C10

+VD

C9

L6

R2

output

50

Ω