2SC1345 (K)
Gain Bandwidth Product vs.
Collector Current
300
V
CE
= 12 V
Gain Bandwidth Product f
T
(MHz)
100
Signal Source Resistance R
g
(kΩ)
30
10
3
1.0
0.3
0.1
0.001 0.003
1
Contours of Constant Noise Figure
V
CE
= 6 V
f = 10 Hz
dB
10
dB
8
dB
6 B
d
4 dB
2
dB
1
dB
B
200
2d
4d
6d
B
100
B
8d
B
10
dB
0
1
2
5
10
20
50
100
Collector Current I
C
(mA)
0.01 0.03
0.1
0.3
Collector Current I
C
(mA)
1.0
3.0
Contours of Constant Noise Figure
100
Signal Source Resistance R
g
(kΩ)
30
10
3
1.0
0.3
V
CE
= 6 V
f = 1 kHz
1
dB
1
dB
2
dB
6 8 10 d
dB dB B
4
dB
2
4
6
dB
dB
dB
8
dB
10
dB
0.1
0.001 0.003
0.01 0.03
0.1
0.3
Collector Current I
C
(mA)
1.0
3.0
5