NXP Semiconductors

Product specification

NPN 5 GHz wideband transistor

BFG25A/X

Fig.13 Common emitter noise figure circles; typical values.

IC = 1 mA; VCE = 1 V; f = 1000 MHz; ZO =50 Ω; Maximum stable gain = 12.4 dB; Fmin = 2 dB; Γopt = 0.78, 14°; Rn/50 = 2.6.

handbook, full pagewidth

0.2

0.5

1

2

5

10

∞

0.2

0.5

1

2

5

10

0

+

j

– j

*

F

= 2 dB

min

OPT

stability

circle

unstable

region

MCD148

0.5

1

0.2

10

5

2

MSG

12.4 dB

11 dB

9 dB

3 dB

6 dB

4 dB

Fig.14 Common emitter noise figure circles; typical values.

IC = 1 mA; VCE = 1 V; f = 2000 MHz; ZO =50 Ω; Maximum stable gain = 8.9 dB; Fmin = 2.4 dB; Γopt = 0.72, 38°; Rn/50 = 1.9.

handbook, full pagewidth

0.2

0.5

1

2

5

10

∞

0.2

0.5

1

2

5

10

0

+ j

– j

0.5

1

0.2

10

5

2

MCD149

stability

circle

unstable

region

0

F

= 2.4 dB

min

OPT

*

1

0.2

10

5

2

0.5

MSG

9 dB

6 dB

7.5 dB

4 dB

6 dB

3 dB

Rev. 04 - 27 November 2007

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