August 1986

6

Philips Semiconductors

Product specification

VHF power transistor

BLY87C

APPLICATION INFORMATION

List of components:

f (MHz)

η (%)

175

13,5

8

< 0,5

>

12,0

< 0,99 >

60

2,2

+ j0,4

96

− j28

175

12,5

8

−

typ. 11,5

−

typ.

65

−−

C1 = 2,5 to 20 pF film dielectric trimmer (cat. no. 2222 809 07004)

C2 = C6 = 4 to 40 pF film dielectric trimmer (cat. no. 2222 809 07008)

C3 = 47 pF ceramic capacitor (500 V)

C4 = 120 pF ceramic capacitor (500 V)

C5 = 100 nF polyester capacitor

C7 = 5 to 60 pF film dielectric trimmer (cat. no. 2222 809 07011)

L1

= 2 turns Cu wire (1,6 mm); int. dia. 4,5 mm; length 5,7 mm; leads 2

× 5 mm

L2

= L6 = Ferroxcube wide-band h.f. choke, grade 3B (cat. no. 4312 020 36640)

L3

= L4 = strip (12 mm

× 6 mm); tap for C3 at 5 mm from transistor

L5

= 3 turns Cu wire (1,6 mm); int. dia. 7,5 mm; length 7,5 mm; leads 2

× 5 mm

L7

= 3 turns Cu wire (1,6 mm); int. dia. 6,5 mm; length 7,4 mm; leads 2

× 5 mm

L3 and L4 are strips on a double Cu-clad printed-circuit board with epoxy fibre-glass dielectric, thickness 1/16".

R1 = 10

Ω carbon resistor

Component layout and printed-circuit board for 175 MHz test circuit see Fig.8.

Fig.7 Test circuit; c.w. class-B.

handbook, full pagewidth

MGP253

50

Ω

50

Ω

C1

L1

L3

R1

L2

L6

L5

L7

L4

C2

C3

T.U.T.

C4

C5

+VCC

C6

C7