2SC1345 (K)
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
6 8 10 d
dB dB B
1
dB
2
4
dB
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
Noise Figure vs. Frequency
12
10
Noise Figure NF (dB)
8
6
4
2
0
10
I
C
= 0.1 mA
R
g
= 10 kΩ
V
CE
= 6 V
10
Noise Figure vs. Collector to
Emitter Voltage
I
C
= 0.1 mA
R
g
= 10 kΩ
f = 10 Hz
Noise Figure NF (dB)
8
6
4
2
0
20
50
100 200
500
Frequency f (Hz)
1k
1
3
10
30
Collector to Emitter Voltage V
CE
(V)
6