OP77
Figure 34 relies upon low TCVOS of the OP77 and noise
combined with very high CMRR to provide precision buffering
of the averaged REF-01 voltage outputs.
In Figure 35, CH must be of polystyrene, Teflon*, or
polyethylene to minimize dielectric absorption and leakage.
The droop rate is determined by the size of CH and the bias
current of the AD820.
*Teflon is a registered trademark of the Dupont Company
1kΩ
+15V
+15V
1N4148
0.1µF
0.1µF
2
3
7
2
3
7
6
6
2N930
OP77
V
AD820
4
1kΩ
OUT
1kΩ
V
IN
4
0.1µF
C
H
0.1µF
RESET
–15V
–15V
Figure 35. Precision Positive Peak Detector
Rev. E | Page 13 of 16