V
CC2
+5 V
V
CC1
+5 V
R5
10 K
R7
470
V
OUT
Q4
2N3904
Q3
2N3906
R4
10
PD2
R6
10
R3
10 K
R1
68 K
V
IN
PD1
LED
R2
68 K
Q2
2N3904
Q1
2N3906
Figure 16. High-Speed Low-Cost Analog Isolator.
V
CC1
+15 V
C3
0.1µ
R4
2.2 K
R5
270
Q1
2N3906
R1
200 K
1%
PD1
7
C1
47
P
2 -
6
3 A1
LT1097
+
4
C4
0.1µ
R3
33 K
D1
1N4150
R6
6.8 K
V
CC2
+15 V
C5
0.1µ
INPUT
BNC
C2
33
P
7
6
LT1097
- 2
A2 3
+
4
C6
0.1µ
R2
174 K
1%
PD2
50 K
OUTPUT
BNC
V
EE1
-15 V
LED
V
EE2
-15 V
Figure 17. Precision Analog Isolation Amplifier.
C3
C1
10 pf
R6
180 K
R2
180 K
D1
-
+
R4
680
OC1
LED
OC1
PD2
-
10 pf
R7
50 K
GAIN
OC1
PD1
V
IN
R1
50 K
BALANCE
V
MAG
+
OC2
PD1
+
-
D2
OC2
LED
R5
680
OC2
PD2
R3
180 K
C2
10 pf
Figure 18. Bipolar Isolation Amplifier.
1-428