August 1986

9

Philips Semiconductors

Product specification

VHF power transistor

BLY89C

OPERATING NOTE

Below 50 MHz a base-emitter resistor of 10

Ω is

recommended to avoid oscillation. This resistor must be

effective for r.f. only.

Fig.12

handbook, halfpage

0

100

300

20

0

MGP872

200

5

10

15

f (MHz)

Gp

(dB)

power gain versus frequency

(class-B operation)

typical values

Fig.13

handbook, halfpage

−5

0

100

300

5

0

MGP873

200

f (MHz)

ri, xi

(

Ω)

input impedance (series components)

versus frequency (class-B operation)

xi

ri

ri

xi

typical values

Fig.14

handbook, halfpage

0

100

300

10

0

MGP874

200

5

2.5

7.5

f (MHz)

RL

(

Ω)

load impedance (parallel components)

versus frequency (class-B operation)

−250

−500

0

250

500

CL

(pF)

CL

RL

RL

CL

typical values