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Simple Automatic VGA for Log Amp output?

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Zangetsu57

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Hello everyone,

Is there a simple automatic variable gain amplifier that I could use to keep the peak-to-peak output voltage constant at the output of a logarithmic amplifier? I'd imagine I could use the logarithmic amplifier output as a parameter in the error voltage signal. Note that the maximum frequency of the output signal is 50 MHz, so I don't need to use a microwave VGA.

Thanks for any help!

Paul
 

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