V
+5 V
CC2
V
+5 V
CC1
R5
10 K
R7
470
LED
R2
68 K
R3
10 K
V
OUT
Q2
Q4
R1
2N3904
2N3904
68 K
Q1
2N3906
Q3
2N3906
V
IN
R4
10
R6
10
PD1
PD2
Figure 16. High-speed low-cost analog isolator.
V
+15 V
V
+15 V
CC1
CC2
C3
0.1µ
C5
0.1µ
R4
2.2 K
R5
270
Q1
2N3906
R6
6.8 K
C1
P
C2
33
R2
R1
200 K
47
174 K
50 K
P
INPUT
BNC
OUTPUT
BNC
1%
1 %
7
4
7
4
-
-
2
3
2
3
6
6
PD1
PD2
A1
A2
LT1097
LT1097
+
+
C6
0.1µ
C4
0.1µ
R3
33 K
D1
1N4150
V
-15 V
LED
V
-15 V
EE2
EE1
Figure 17. Precision analog isolation amplifier.
C3 10 pf
C1 10 pf
R6
180 K
R7
50 K
R2
180 K
D1
R4
680
-
GAIN
OC1
PD2
+
OC1
PD1
OC1
LED
-
V
MAG
R1
50 K
V
+
IN
BALANCE
OC2
LED
OC2
PD1
OC2
PD2
+
-
R5
680
R3
180 K
D2
C2 10 pf
V
V
= +15 V
= -15 V
CC1
EE1
Figure 18. Bipolar isolation amplifier.
13
AVAGO [ AVAGO TECHNOLOGIES LIMITED ]
