BCW72LT1 データシートの表示（PDF） - Leshan Radio Company

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BCW72LT1

General Purpose Transistors

Leshan Radio Company 

LESHAN RADIO COMPANY, LTD.

TYPICAL NOISE CHARACTERISTICS

(V CE = 5.0 Vdc, T A = 25°C)

BCW72LT1

20

IC=1.0 mA

300µA

10

7.0

100µA

5.0

BANDWIDTH = 1.0 Hz

R S ~ ~ 0

3.0 10µA 30µA

2.0

10 20

50 100 200 500 1.0k 2.0k 5.0k 10 k

f, FREQUENCY (Hz)

Figure 3. Noise Voltage

100

50

IC=1.0mA

20

10

5.0

300µA

BANDWIDTH = 1.0 Hz

R S~ ~

100µA

2.0

1.0

0.5

0.2

0.1

10

30µA

10µA

20

50 100 200 500 1.0k 2.0k

5.0k 10 k

f, FREQUENCY (Hz)

Figure 4. Noise Current

NOISE FIGURE CONTOURS

(V = 5.0 Vdc, T = 25°C)

CE

A

500k

200k

100k

50k

20k

10k

5.0k

2.0k

1.0k

500

200

100

50

10

BANDWIDTH = 1.0 Hz

2.0 dB

3.0 dB 4.0dB

6.0 dB

10 dB

20 30 50 70 100

200 300 500 700 1.0K

I C , COLLECTOR CURRENT (µA)

Figure 5. Narrow Band, 100 Hz

1.0M

500k

200k

100k

50k

20k

10k

5.0k

2.0k

1.0k

500

200

100

10

BANDWIDTH = 1.0 Hz

1.0 dB

2.0 dB

3.0 dB

5.0 dB

8.0 dB

20 30 50 70 100

200 300 500 700 1.0K

I C , COLLECTOR CURRENT (µA)

Figure 6. Narrow Band, 1.0 kHz

500k

200k

100k

50k

20k

10k

5.0k

2.0k

1.0k

500

200

100

50

10

10 Hz to 15.7KHz

1.0 dB

2.0 dB

3.0 dB

5.0 dB

8.0 dB

20 30 50 70 100

200 300 500 700 1.0K

I C , COLLECTOR CURRENT (µA)

Figure 7. Wideband

Noise Figure is Defined as:

( –––––––––––––––) NF = 20 log

10

e

n

2

+4KTRS

+I

2

n

R

2

S

4KTR S

1/ 2

e n = Noise Voltage of the Transistor referred to the input. (Figure 3)

I n = Noise Current of the Transistor referred to the input. (Figure 4)

K = Boltzman’s Constant (1.38 x 10 –23 j/ °K)

T = Temperature of the Source Resistance ( °K)

R s = Source Resistance ( Ω )

M14–3/6

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