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

TYPICAL NOISE CHARACTERISTICS
(VCE = 5.0 Vdc, TA = 25°C)
MMBTA20LT1
20
IC = 1.0 mA
300 µA
10
BANDWIDTH = 1.0 Hz
RS = 0
7.0
100 µA
5.0
10 µA
3.0
30 µA
2.0
10 20
50 100 200 500 1 k 2 k
f, FREQUENCY (Hz)
Figure 3. Noise Voltage
5 k 10 k
100
50
IC = 1.0 mA
20
10
5.0
300 µA
BANDWIDTH = 1.0 Hz
RS ≈ ∞
100 µA
2.0
1.0
0.5
30 µA
0.2
10 µA
0.1
10 20
50 100 200 500 1 k 2 k
f, FREQUENCY (Hz)
Figure 4. Noise Current
5 k 10 k
NOISE FIGURE CONTOURS
(VCE = 5.0 Vdc, TA = 25°C)
500 k
200 k
100 k
50 k
20 k
10 k
5k
2k
1k
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 1 k
IC, COLLECTOR CURRENT (µA)
Figure 5. Narrow Band, 100 Hz
1M
500 k
200 k
100 k
50 k
20 k
10 k
5k
2k
1k
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 k
IC, COLLECTOR CURRENT (µA)
Figure 6. Narrow Band, 1.0 kHz
500 k
200 k
100 k
50 k
20 k
10 k
5k
2k
1k
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
20 30 50 70 100 200 300
IC, COLLECTOR CURRENT (µA)
Figure 7. Wideband
500 700 1 k
+ ǒ ^{) )} Ǔ ^{ń Noise Figure is defined as:}
NF
20 log10 ^en2
4KTRS In ^{2RS2 1 2}
4KTRS
en = Noise Voltage of the Transistor referred to the input. (Figure 3)
In = 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)
RS = Source Resistance (Ohms)
Motorola Small–Signal Transistors, FETs and Diodes Device Data
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