BC618

3

Motorola Small–Signal Transistors, FETs and Diodes Device Data

NOISE CHARACTERISTICS

(VCE = 5.0 Vdc, TA = 25°C)

Figure 2. Noise Voltage

f, FREQUENCY (Hz)

50

100

200

500

20

Figure 3. Noise Current

f, FREQUENCY (Hz)

Figure 4. Total Wideband Noise Voltage

RS, SOURCE RESISTANCE (kΩ)

Figure 5. Wideband Noise Figure

RS, SOURCE RESISTANCE (kΩ)

5.0

50

70

100

200

30

10

20

1.0

10

10

20

50 100 200

500

1 k 2 k

5 k 10 k 20 k

50 k 100 k

2.0

1.0

0.7

0.5

0.3

0.2

0.1

0.07

0.05

0.03

0.02

BANDWIDTH = 1.0 Hz

RS ≈ 0

IC = 1.0 mA

100

µA

10

µA

BANDWIDTH = 1.0 Hz

IC = 1.0 mA

100

µA

10

µA

2.0

5.0

10

20

50

100

200

500

100

0

BANDWIDTH = 10 Hz TO 15.7 kHz

IC = 10 µA

100

µA

1.0 mA

8.0

10

12

14

6.0

0

4.0

1.0

2.0

5.0

10

20

50

100

200

500

100

0

2.0

BANDWIDTH = 10 Hz TO 15.7 kHz

10

µA

100

µA

IC = 1.0 mA

10

20

50 100 200

500

1 k 2 k

5 k 10 k 20 k

50 k 100 k