Datasheet

5
FN1050.6
March 4, 2005
Schematic Diagram (One Amplifier of Two)
FIGURE 2. TEST CIRCUIT AMPLIFIER (30dB GAIN) USED FOR WIDEBAND NOISE MEASUREMENT
Test Circuits and Waveforms (Continued)
R
S
CA3240
+15V
-15V
0.01µF
0.01µF
+
-
BW (-3dB) = 140kHz
TOTAL NOISE VOLTAGE
30.1kΩ
1kΩ
1MΩ
(REFERRED TO INPUT) = 48µV (TYP)
NOISE
VOLTAGE
OUTPUT
BIAS CIRCUIT INPUT STAGE SECOND STAGE OUTPUT STAGE DYNAMIC CURRENT SINK
V+
OUTPUT
V-
INVERTING
INPUT
NON-INVERTING
INPUT
+
-
R
1
8K
Q
1
D
1
Q
6
Q
7
Q
8
Q
2
Q
5
Q
4
Q
3
D
2
D
3
D
4
D
5
Q
9
Q
10
R
2
500Ω
R
5
500Ω
R
4
500Ω
R
3
500Ω
Q
11
Q
12
Q
13
C
1
12pF
Q
14
R
6
50Ω
R
7
30Ω
Q
15
Q
16
R
8
1K
R
11
20Ω
Q
17
R
10
1K
R
9
50Ω
D
7
D
8
Q
20
Q
21
R
12
12K
R
14
20K
R
13
15K
D
6
Q
18
Q
19
NOTES:
9. All resistance values are in ohms.
CA3240, CA3240A