2003 Sep 26

9

Philips Semiconductors

Product specification

UHF push-pull power MOS transistor

BLF548

Notes

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

2. American Technical Ceramics (ATC) capacitor, type 175B or other capacitor of the same quality.

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

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

thickness 0.79 mm.

5. Cables L2 and L23 are soldered to striplines L1 and L22 respectively.

C13, C16

electrolytic capacitor

10

µF, 63 V

2222 030 38109

C18

multilayer ceramic chip capacitor;

note 2

18 pF

C19

multilayer ceramic chip capacitor;

note 2

12 pF

C20

multilayer ceramic chip capacitor;

note 2

8.2 pF

C23, C24

multilayer ceramic chip capacitor;

note 1

30 pF

L1, L3, L22, L24

stripline; note 4

34.5

Ω

length 66.5 mm

width 4 mm

L2, L23

semi-rigid cable; note 5

50

Ω

length 66.5 mm

width 3.6 mm

L4, L5

stripline; note 4

22.3

Ω

length 35 mm

width 7 mm

L6, L7

stripline; note 4

22.3

Ω

length 10 mm

width 7 mm

L8, L9

stripline; note 4

22.3

Ω

length 5.5 mm

width 7 mm

L10, L11, L16, L17

grade 3B Ferroxcube wideband RF

choke

4312 020 36642

L12, L15

1 turn enamelled 1.5 mm copper

wire

17 nH

length 5 mm

int. dia. 9 mm

leads 2

× 5mm

L13, L14

stripline; note 4

22.3

Ω

length 15 mm

width 7 mm

L18, L19

stripline; note 4

22.3

Ω

length 36 mm

width 7 mm

L20, L21

stripline; note 4

22.3

Ω

length 8.5 mm

width 7 mm

R1, R5

0.4 W metal film resistor

24.7 k

Ω

2322 151 72473

R2, R6

10 turn potentiometer

5 k

Ω

R3, R4

0.4 W metal film resistor

10.5 k

Ω

2322 151 71053

R7, R8

1 W metal film resistor

10

Ω

2322 151 51009

COMPONENT

DESCRIPTION

VALUE

DIMENSIONS

CATALOGUE NO.