BC846A / BC846B / BC847A / BC847B / BC847C
NPN General Purpose Amplifier
(continued)
Typical Characteristics
(continued)
Noise Figure vs Frequency
10
V
CE
- COLLECTOR VOLTAGE (V)
I
C
= 200
µA,
R
S
= 10 kΩ
I
C
= 100
µA,
R
S
= 10 kΩ
I
C
= 1.0 mA,
R
S
= 500
Ω
10
7
5
Contours of Constant Gain
Bandwidth Product (f
T
)
175 MHz
NF - NOISE FIGURE (dB)
8
6
4
3
2
150 MHz
I
C
= 1.0 mA,
R
S
= 5.0 kΩ
V
CE
= 5.0V
2
125 MHz
100 MHz
75 MHz
0
0.0001
0.001
0.01
0.1
1
f - FREQUENCY (MHz)
10
100
1
0.1
1
10
I
C
- COLLECTOR CURRENT (mA)
100
Contours of Constant
Narrow Band Noise Figure
R
S
- SOURCE RESISTANCE (
Ω
)
3.0 dB
5,000
Contours of Constant
Narrow Band Noise Figure
R
S
- SOURCE RESISTANCE (
Ω
)
10,000
5,000
10,000
4.0 dB
2,000
1,000
500
V
CE
= 5.0 V
2.0 dB
2,000
6.0 dB
8.0 dB
10 dB
f = 100 Hz
BANDWIDTH
= 20 Hz
3.0 dB
1,000
4.0 dB
500
V
CE
= 5.0 V
f = 1.0 kHz
BANDWIDTH
200
= 200 Hz
6.0 dB
8.0 dB
200
100
12 dB
14 dB
100
1
10
100
I
C
- COLLECTOR CURRENT (
µ
A)
1,000
1
10
100
I
C
- COLLECTOR CURRENT (
µ
A)
1,000
Contours of Constant
Narrow Band Noise Figure
R
S
- SOURCE RESISTANCE (
Ω
)
5000
2000
1000
500
200
100
1
V
CE
= 5.0V
f = 10kHz
BANDWIDTH
= 2.0kHz
R
S
- SOURCE RESISTANCE (
Ω
)
10000
1.0 dB
2.0 dB
3.0 dB
4.0 dB
6.0 dB
8.0 dB
Contours of Constant
Narrow Band Noise Figure
10000
5000
2000
1000
500
2.0 dB
3.0 dB
5.0
dB
6.0
dB
10
100
I
C
- COLLECTOR CURRENT (
µ
A)
1000
V
CE
=
4.0 dB
5.0V
f = 1.0 MHz
200
BANDWIDTH
7.0 dB
= 200kHz
8.0 dB
100
0.01
0.1
1
I
C
- COLLECTOR CURRENT (
µ
A)
10
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
