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Question about AGC stability.

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kooller

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Hi every one:
When designing an AGC circuit, what should be pay attention to make sure the designed AGC is in absolute stable state?
 

kooller said:
Hi every one:
When designing an AGC circuit, what should be pay attention to make sure the designed AGC is in absolute stable state?
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Firstly, you should know the frequency characteristics of the chosen level detector.
Then, what is the relationship between control voltage and gain for your VGA ?
And what is the frequency characteristic of the controller (in most cases a LPF).
At the end you should try to analyze the loop gain of the whole circuit - linearized around the normal working point
 

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