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Fast Peak Detection Ciruit using AD823


I am trying to replace AD843 Opamp using a surface mount Opamp (AD823) for a fast peak detection circuit as shown in Page 11 of the AD843 Datasheet below.

Currently, I am trying to simulate the circuit in PSPICE using opamp models for AD823, instead of AD847/AD843 as shown in the diagram.

However, I am having issue using AD823 to make the circuit functional, as it does not detect the peak of a signal as we were expecting. Any idea why I am having this problem?

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