September 1992

7

Philips Semiconductors

Product specification

HF/VHF power MOS transistor

BLF242

List of components (class-B 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 epoxy fibre-glass dielectric (

COMPONENT

DESCRIPTION

VALUE

DIMENSIONS

CATALOGUE NO.

C1, C2, C7

film dielectric trimmer

4 to 40 pF

2222 809 08002

C3

multilayer ceramic chip capacitor

(note 1)

100 pF

C4, C8

ceramic chip capacitor

100 nF

2222 852 47104

C6

film dielectric trimmer

5 to 60 pF

2222 809 08003

C9

electrolytic capacitor

2.2

µF, 40 V

L1

5 turns enamelled 0.7 mm copper wire

53 nH

length 5.4 mm

int. dia. 3 mm

leads 2

× 5mm

L2, L3

stripline (note 2)

30

Ω

10

× 6mm

L4

11 turns enamelled 1 mm copper wire

500 nH

length 15.5 mm

int. dia. 8 mm

leads 2

× 5mm

L5

5 turns enamelled 1 mm copper wire

79 nH

length 9.1 mm

int. dia. 5 mm

leads 2

× 5mm

L6

grade 3B Ferroxcube RF choke

4312 020 36640

R1

0.5 W metal film resistor

47

Ω

R2

0.5 W metal film resistor

10

Ω

Fig.11 Test circuit for class-B operation.

f = 175 MHz.

handbook, full pagewidth

MGP145

input

50

Ω

C1

C3

C3

L6

R2

L1

L2

D.U.T.

L3

L5

+VG

L4

R1

C2

C7

C8

C9

+VD

C6

C5

output

50

Ω