MMBT3906L, SMMBT3906L
www.onsemi.com
4
TYPICAL AUDIO SMALL−SIGNAL CHARACTERISTICS
NOISE FIGURE VARIATIONS
(V
CE
= −5.0 Vdc, T
A
= 25°C, Bandwidth = 1.0 Hz)
Figure 7.
f, FREQUENCY (kHz)
2.0
3.0
4.0
5.0
1.0
0.1
Figure 8.
R
g
, SOURCE RESISTANCE (k OHMS)
0
NF, NOISE FIGURE (dB)
1.0 2.0 4.0 10 20
40
0.2 0.4
0
100
4
6
8
10
12
2
0.1 1.0 2.0 4.0 10 20
40
0.2 0.4
100
NF, NOISE FIGURE (dB)
f = 1.0 kHz
I
C
= 1.0 mA
I
C
= 0.5 mA
I
C
= 50 mA
I
C
= 100 mA
SOURCE RESISTANCE = 200 W
I
C
= 1.0 mA
SOURCE RESISTANCE = 200 W
I
C
= 0.5 mA
SOURCE RESISTANCE = 2.0 k
I
C
= 100 mA
SOURCE RESISTANCE = 2.0 k
I
C
= 50 mA
h PARAMETERS
(V
CE
= −10 Vdc, f = 1.0 kHz, T
A
= 25°C)
Figure 9. Current Gain
I
C
, COLLECTOR CURRENT (mA)
70
100
200
300
50
Figure 10. Output Admittance
I
C
, COLLECTOR CURRENT (mA)
h , DC CURRENT GAIN
h , OUTPUT ADMITTANCE ( mhos)
Figure 11. Input Impedance
I
C
, COLLECTOR CURRENT (mA)
Figure 12. Voltage Feedback Ratio
I
C
, COLLECTOR CURRENT (mA)
30
100
50
10
20
2.0
3.0
5.0
7.0
10
1.0
0.1 0.2 1.0 2.0
5.0
0.5
10
0.3 0.5 3.0
0.7
2.0
5.0
10
20
1.0
0.2
0.5
oe
h , VOLTAGE FEEDBACK RATIO (X 10 )
re
h , INPUT IMPEDANCE (k OHMS)
ie
0.1 0.2 1.0 2.0
5.0 10
0.3 0.5 3.0
0.1 0.2 1.0 2.0
5.0 10
0.3 0.5 3.0
7
5
0.1 0.2 1.0 2.0
5.0 10
0.3 0.5 3.0
fe
m
-4
70
30
0.7
7.0
0.7
7.0
7.0
3.0
0.7
0.3
0.7
7.0
0.7
7.0
