MMBTA70LT1 Datasheet, PDF (2/8 Pages) Motorola, Inc – General Purpose Transistor

MMBTA70LT1
TYPICAL NOISE CHARACTERISTICS
(VCE = –ā5.0 Vdc, TA = 25°C)
10
7.0
5.0
3.0
2.0 ^{1.0 mA}
IC = 10 µA
30 µA
100 µA
300 µA
BANDWIDTH = 1.0 Hz
RS ≈ 0
1.0
10 20
50 100 200 500 1.0 k 2.0 k 5.0 k 10 k
f, FREQUENCY (Hz)
Figure 1. Noise Voltage
1.0
7.0
5.0
3.0
2.0
1.0
0.7
0.5
0.3
0.2
0.1
10 20
IC = 1.0 mA
BANDWIDTH = 1.0 Hz
RS ≈ ∞
300 µA
100 µA
30 µA
10 µA
50 100 200 500 1.0 k 2.0 k 5.0 k 10 k
f, FREQUENCY (Hz)
Figure 2. Noise Current
NOISE FIGURE CONTOURS
(VCE = –ā5.0 Vdc, TA = 25°C)
1.0 M
500 k
200 k
100 k
50 k
20 k
10 k
5.0 k
2.0 k
1.0 k
500
200
100
10
BANDWIDTH = 1.0 Hz
0.5 dB
1.0 dB
2.0 dB
3.0 dB
5.0 dB
20 30 50 70 100 200 300 500 700 1.0 k
IC, COLLECTOR CURRENT (µA)
Figure 3. Narrow Band, 100 Hz
1.0 M
500 k
200 k
100 k
50 k
20 k
10 k
5.0 k
2.0 k
1.0 k
500
200
100
10
BANDWIDTH = 1.0 Hz
0.5 dB
1.0 dB
2.0 dB
3.0 dB
5.0 dB
20 30 50 70 100
200 300 500 700 1.0 k
IC, COLLECTOR CURRENT (µA)
Figure 4. Narrow Band, 1.0 kHz
1.0 M
500 k
200 k
100 k
50 k
20 k
10 k
5.0 k
2.0 k
1.0 k
500
200
100
10
10 Hz to 15.7 kHz
0.5 dB
1.0 dB
2.0 dB
3.0 dB
5.0 dB
20 30 50 70 100 200 300 500 700 1.0 k
IC, COLLECTOR CURRENT (µA)
Figure 5. Wideband
+ ƪ ^{) )} ƫ ^{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)
2
Motorola Small–Signal Transistors, FETs and Diodes Device Data