NXP Semiconductors

Product specification

NPN 5 GHz wideband transistor

BFG25A/X

Fig.10 Minimum noise figure as a function of

collector current; typical values.

VCE =1V.

handbook, halfpage

4

2

1

0

3

MCD145

10−1

110

F

(dB)

IC (mA)

f = 2 GHz

1 GHz

500 MHz

Fig.11 Minimum noise figure as a function of

frequency; typical values.

VCE =1V.

handbook, halfpage

4

2

1

0

3

MCD146

102

104

103

F

(dB)

f (MHz)

IC = 2 mA

1 mA

0.5 mA

Fig.12 Common emitter noise figure circles; typical values.

IC = 1 mA; VCE = 1 V; f = 500 MHz; ZO =50 Ω; Maximum stable gain = 15.6 dB; Fmin = 1.9 dB; Γopt = 0.85, 5°; Rn/50 = 2.4.

handbook, full pagewidth

0.2

0.5

1

2

5

10

∞

0.2

0.5

1

2

5

10

0

+

j

– j

F

= 1.9 dB

min

stability

circle

unstable region

12 dB

OPT

*

MCD147

10

15

2

0.5

0.2

MSG

15.6 dB

14 dB

2.5 dB

4 dB

6 dB

Rev. 04 - 27 November 2007

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