Frank_Heart
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Posts: 29
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Hi, Horror,
My understanding is, to apply a conditional-stable amplifier for some applications, we shall make sure there is no fixed strong signal @ fx, where phase=-180 degree . Like if you are modulating and demodulating the signal with a fixed carrier and it's better to make sure the carrier is not around fx.
In any case we got signals containing strong fx for some period, the loop will be saturated in any circuit due to Gain>1 @ fx. The loop shall have some recovery mechanism, such that once fx part is gone, the loop goes into recovery. During the recovery the fast path in the loop (which is usually the 1st order one, which gives you 20dB/dec cross dB=0 line in the bode plot) shall take over and hopefully the loop goes back to stable.
How we guarantee the stable recovery of the loop, like in many SDM? I have done several ones and the only way I use is to run simulations to check.
Hope this helps.
Regards, Frank
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