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KEVIN,thanks The input signal,goes into a power amplifying part,is from a digital signal source.The loads of power amplifying part are inductive or capacitive. A phase shifting would occur between input signal and output signal from power amplifying part. Let output signal to keep track of the input signal phase,nothing done with the input signal.

Hello How to design a analog circuit which has the function following: the input signal of the circuit is a 50-to-450 Hz sine wave, 1Vrms,the output signal has the same waveform, same frequency, especially no phase difference(no lead & no lag) with input wave, other electric characteristics need not care. How to design? Can you help me?