MMBTA20LT1 Datasheet, PDF (3/8 Pages) Motorola, Inc – General Purpose Amplifier

MMBTA20LT1
NOISE FIGURE CONTOURS
(V_CE = 5.0 Vdc, T_A = 25°C)
500Ăk
200Ăk
100Ăk
50Ăk
20Ăk
10Ăk
5Ăk
2Ăk
1Ăk
500
200
100
50
10
BANDWIDTH = 1.0 Hz
2.0 dB
3.0 dB _{4.0 dB}
6.0 dB
10 dB
20 30 50 70 100
200 300 500 700 1Ăk
I_C, COLLECTOR CURRENT (µA)
Figure 5. Narrow Band, 100 Hz
1ĂM
500Ăk
200Ăk
100Ăk
50Ăk
20Ăk
10Ăk
5Ăk
2Ăk
1Ăk
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 1Ăk
I_C, COLLECTOR CURRENT (µA)
Figure 6. Narrow Band, 1.0 kHz
500Ăk
200Ăk
100Ăk
50Ăk
20Ăk
10Ăk
5Ăk
2Ăk
1Ăk
500
200
100
50
10
10 Hz to 15.7 kHz
1.0 dB
2.0 dB
3.0 dB
5.0 dB
8.0 dB
Noise Figure is defined as:
ǒ Ǔ NF + 20 log10
en2 ) 4KTRS ) In ^2RS2
4KTRS
1ń2
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 (Ohms)
20 30 50 70 100 200 300
I_C, COLLECTOR CURRENT (µA)
Figure 7. Wideband
500 700 1Ăk
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