1998 Feb 09

17

Philips Semiconductors

Product specification

UHF linear push-pull power transistor

BLV57

The circuit and the components are on one side of the PTFE fibre-glass board, the other side is unetched copper to serve

as a ground-plane. Earth connections are made by means of bolts. Additionally copper straps are used under the emitters

and at the input and output to provide direct contact between the copper on the component side and the ground-plane.

Fig.17 Component layout and printed-circuit board for 860 MHz class-AB test circuit.

handbook, full pagewidth

60

11

64

73

+V

BB1

+V

CC1

+V

CC2

+V

BB2

input

C14

C11

C8

C5

L1

L2

C1

C3

C2

L5

L3

C4

C9

L6

L7

L11

L10

L12

L9

C13

C15

C17

C18

C20

C19

C16

C12

C10

C7

L8

L4

C6

C21

L14

L13

R1

L10

L11

output

MGP373

11