Jacki
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Thank you for your reply. Yes, the gain compensation is good, just wonder why it also requires phase shift. two poles and two zeros in RHP will contribute 360 degree phase shift. As I remember, the phase shift will cover around 100x frequency band based on the pole/zero frequency. As I understand, all-pass filter should have the flat gain and flat phase shift for all of the input signals, and if so, how about the transition frequency band for the phase shift, also how to select the pole/zero frequency in the all-pass filter? Isn't it more convenient to move the zeros to LHP? Thank you.
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