2N3906
TYPICAL AUDIO SMALL−SIGNAL CHARACTERISTICS
NOISE FIGURE VARIATIONS
(V
CE
=
−
5.0 Vdc, T
A
= 25°C, Bandwidth = 1.0 Hz)
5.0
SOURCE RESISTANCE = 200
W
I
C
= 1.0 mA
NF, NOISE FIGURE (dB)
SOURCE RESISTANCE = 200
W
I
C
= 0.5 mA
SOURCE RESISTANCE = 2.0 k
I
C
= 50
mA
12
f = 1.0 kHz
10
I
C
= 0.5 mA
8
6
4
2
0
I
C
= 50
mA
I
C
= 100
mA
I
C
= 1.0 mA
NF, NOISE FIGURE (dB)
4.0
3.0
2.0
SOURCE RESISTANCE = 2.0 k
I
C
= 100
mA
0.2
0.4
1.0 2.0 4.0
10
f, FREQUENCY (kHz)
20
40
100
1.0
0
0.1
0.1
0.2
0.4
1.0 2.0
4.0
10
20
R
g
, SOURCE RESISTANCE (k OHMS)
40
100
Figure 7.
Figure 8.
h PARAMETERS
(V
CE
=
−
10 Vdc, f = 1.0 kHz, T
A
= 25°C)
300
hoe, OUTPUT ADMITTANCE (
m
mhos)
100
70
50
30
20
h fe , DC CURRENT GAIN
200
100
70
50
10
7
30
0.1
0.2
0.3
0.5 0.7 1.0
2.0 3.0
I
C
, COLLECTOR CURRENT (mA)
5.0 7.0 10
5
0.1
0.2
0.3
0.5 0.7 1.0
2.0 3.0
I
C
, COLLECTOR CURRENT (mA)
5.0 7.0 10
Figure 9. Current Gain
h re , VOLTAGE FEEDBACK RATIO (X 10
-4
)
20
h ie , INPUT IMPEDANCE (k OHMS)
10
7.0
5.0
3.0
2.0
1.0
0.7
0.5
0.3
0.2
10
7.0
5.0
3.0
2.0
Figure 10. Output Admittance
1.0
0.7
0.5
0.1
0.2
0.3
0.5 0.7 1.0
2.0 3.0
I
C
, COLLECTOR CURRENT (mA)
5.0 7.0 10
0.1
0.2
0.3
0.5 0.7 1.0
2.0 3.0
I
C
, COLLECTOR CURRENT (mA)
5.0 7.0 10
Figure 11. Input Impedance
Figure 12. Voltage Feedback Ratio
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