1999 Jul 23

8

Philips Semiconductors

Product specification

UHF wideband transistor

PRF957

handbook, full pagewidth

MGS522

0

0.2

0.6

0.4

0.8

1.0

1.0

+5

+2

+1

−0.2

−0.5

−1

−2

−5

0.2

0.5

1

2

5

180

°

−135

°

−90

°

−45

°

0

°

45

°

90

°

unstable

region load

unstable region

source

Γopt

(2)

(4)

(5)

(6)

(3)

(1)

0

+0.5

+0.2

135

°

Fig.12 Common emitter available gain, noise and stability circles; typical values.

(1) G = 16 dB

(2) G = 15 dB

(3) G = 14 dB

(4) NF = 1.3 dB

(5) NF = 1.5 dB

(6) NF = 1.7 dB.

handbook, full pagewidth

MGS523

0

0.2

0.6

0.4

0.8

1.0

1.0

+5

+2

+1

+0.5

−0.5

−1

−2

−5

0.2

0.5

1

2

5

180

°

−135

°

−90

°

−45

°

0

°

45

°

90

°

135

°

unstable

region load

unstable region

source

Γopt

(2)

(3)

(4)

(5)

(6)

(7)

(1)

0

+0.2

−0.2

Fig.13 Common emitter available gain, noise and stability circles; typical values.

(2) G=9dB

(3) G=8dB

(4) G=7dB

(5) NF = 1.8 dB

(6) NF = 2 dB

(7) NF = 2.2 dB.