August 1986

6

Philips Semiconductors

Product specification

VHF power transistor

BLY89C

APPLICATION INFORMATION

R.F. performance in c.w. operation (unneutralized common-emitter class-B circuit)

List of components:

f (MHz)

η (%)

175

13,5

25

< 6,25

>

6

< 2,64

>

70

1,6

+ j1,4

210

+ j5,5

175

12,5

25

−

typ 6,6

−

typ 75

−−

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

C2 = C8 = 4 to 40 pF film dielectric trimmer (cat. no. 2222 809 07008)

C3a = C3b = 47 pF ceramic capacitor (500 V)

C4 = 120 pF ceramic capacitor

C5 = 100 nF polyester capacitor

C6a = C6b = 8,2 pF ceramic capacitor (500 V)

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

L1 = 1 turn enamelled Cu wire (1,6 mm); int. dia. 9,0 mm; leads 2

× 5 mm

L2 = 100 nH; 7 turns closely wound enamelled Cu wire (0,5 mm); int. dia. 3 mm; leads 2

× 5 mm

L3 = L8 = Ferroxcube choke coil (cat. no. 4312 020 36640)

L4 = L5 = strip (12 mm

× 6 mm); taps for C3a and C3b at 5 mm from transistor

L6 = 2 turns enamelled Cu wire (1,6 mm); int. dia. 5,0 mm; length 6,0 mm; leads 2

× 5 mm

L7 = 2 turns enamelled Cu wire (1,6 mm); int. dia. 4,5 mm; length 6,0 mm; leads 2

× 5 mm

L4 and L5 are strips on a double Cu-clad printed-circuit board with epoxy fibre-glass dielectric, thickness 1/16".

R1 = 10

Ω (±10%) carbon resistor

R2 = 4,7

Ω (±5%) carbon resistor

handbook, full pagewidth

C7

50

Ω

50

Ω

MGP604

,,

,,

,,

C1

C2

C3b

C3a

C6a

C4

C5

R2

L3

C6b

C8

L1

L2

L4

R1

L5

L7

T.U.T.

L6

L8

+VCC

Fig.7 Test circuit for 175 MHz.