> I want to build an ideal device for use in PSpice simulations, a Keyed
> Peak Detector...
>
> Finds the maximum peak value of an input voltage while it's enabled
> ("keyed"), and "dumps"/outputs zero when not enabled.
>
> Any ideas?
That sounds like the old 'Keyed AGC' on TVs. A pulse from the flyback set a reference once each line, then the detected signal level was used to set the RF & IF gain.
It's the other way around, like the fast-attack/slow-release AGC in single sideband receivers. Except that Jim wants to reset it when keyed off.
I rarely have to use that in SPICE but stuff like this I mostly fudge out of real parts with the important values at the extremes, where the computer doesn't beep and the results are still reasonably accurate.
The concept was the same though. You had a fixed reference level to compare the signal to, and used the recovered peak as needed.
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