MPSA20 NTE ELECTRONICS, MPSA20 Datasheet - Page 3

• Manufacturer Part Number: MPSA20
• Description: T-NPN SI- DARL PREAMP
• Manufacturer: NTE ELECTRONICS

500 k
200 k
100 k
500 k
200 k
100 k
7.0
5.0
3.0
2.0
50 k
20 k
10 k
50 k
20 k
10 k
20
10
500
200
100
500
200
100
5 k
2 k
1 k
5 k
2 k
1 k
50
50
10
10
10
10 mA
I
C
20
= 1.0 mA
2.0 dB
30 mA
100 mA
20
20
300 mA
Figure 5. Narrow Band, 100 Hz
50
30
30
Figure 3. Noise Voltage
I
I
C
C
100
, COLLECTOR CURRENT (mA)
, COLLECTOR CURRENT (mA)
Figure 7. Wideband
50 70 100
f, FREQUENCY (Hz)
50 70 100
3.0 dB 4.0 dB
200
1.0 dB
500
BANDWIDTH = 1.0 Hz
1 k
200 300
200 300
BANDWIDTH = 1.0 Hz
6.0 dB
10 Hz to 15.7 kHz
5.0 dB
NOISE FIGURE CONTOURS
R
8.0 dB
2 k
2.0 dB
S
= 0
(V
500 700 1 k
500 700 1 k
CE
http://onsemi.com
10 dB
5 k
3.0 dB
= 5.0 Vdc, T
MPSA20
10 k
3
500 k
200 k
100 k
Noise Figure is defined as:
NF + 20 log 10
e
I
K
T
R
100
n
5.0
2.0
1.0
0.5
0.2
0.1
50 k
20 k
10 k
n
A
1 M
200
50
20
10
500
100
S
5 k
2 k
1 k
= 25°C)
= Noise Voltage of the Transistor referred to the input. (Figure 3)
= Noise Current of the Transistor referred to the input. (Figure 4)
= Boltzman’s Constant (1.38 x 10
= Temperature of the Source Resistance (°K)
= Source Resistance (Ohms)
10
10
20
I
C
= 1.0 mA
30 mA
20
Figure 6. Narrow Band, 1.0 kHz
50
e n 2 ) 4KTR S ) I n 2 R S 2
30
1.0 dB
Figure 4. Noise Current
I
C
100
, COLLECTOR CURRENT (mA)
f, FREQUENCY (Hz)
50 70 100
4KTR S
200
300 mA
10 mA
500
2.0 dB
−23
100 mA
j/°K)
BANDWIDTH = 1.0 Hz
1 k
200 300
BANDWIDTH = 1.0 Hz
1 2
3.0 dB
R
2 k
S
≈ ∞
500 700 1 k
5.0 dB
8.0 dB
5 k
10 k