1995 Oct 27

7

Philips Semiconductors

Product specification

Silicon planar epitaxial

overlay transistors

2N3866; 2N4427

Fig.5 Test circuit for the 2N4427 at 175 MHz.

(1) The length of the external emitter wire is 1.6 mm.

handbook, full pagewidth

C1

input

50

Ω

output

50

Ω

L1

C2

C6

R

C3

C4

MGC940

L2

L4

L3

C5

DUT

VCC

(1)

List of components (see Fig.5)

COMPONENT

DESCRIPTION

VALUE

DIMENSIONS

CATALOGUE No.

C1, C2, C3, C4

air trimmer capacitor

4 to 29 pF

C5

feed-through

capacitor

1nF

C6

capacitor

12 nF

R

resistor

10

Ω

L1

2 turns 1.0 mm

copper wire

−

int. diameter 6 mm;

winding pitch 2 mm;

leads 2

× 10 mm

L2

Ferroxcube choke coil Z = 550

Ω;

f = 175 MHz

4312 020 36640

L3

2 turns 1.0 mm

copper wire

−

int. diameter 5 mm;

winding pitch 2 mm;

leads 2

× 10 mm

L4

3 turns 1.5 mm

copper wire

−

int. diameter 10 mm;

winding pitch 2 mm;

leads 2

× 15 mm