Fast Peak Detection Ciruit using AD823

Question

Hello, 
 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. 
 http://www.analog.com/static/imported-files/data_sheets/AD843.pdf 
 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?

FormerMember · Accepted Answer

Bluechip, 
 The AD823 slew rate is ten times lower than the AD843. 
 Do you have before and after simulation graphs? 
 How big is your pulse, etc. 
 Harry)

EZAdministrator · Answer

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Fast Peak Detection Ciruit using AD823