Common-mode level shift treatment circuit and method for operational amplifier

The embodiment of the invention discloses common-mode level shift treatment circuit and method for an operational amplifier. The treatment circuit comprises a buffer for buffering a received signal so as to improve the driving capacity of the signal, a first filter circuit for performing band-pass filtering for the signal processed by the buffer, a first operational amplifier for amplifying the signal processed by the buffer and subjected to band-pass filtering, and a second filter circuit for performing band-pass filtering for the signal amplified by the signal amplifier so as to obtain a filtered signal. By adopting the treatment circuit, the problem of common-mode level shift at the input end and the output end of the operational amplifier during amplifying a signal transmitted through an RF antenna by a wireless manner through the operational amplifier can be solved; the output signals can be kept in the same common-mode level, which facilitates the subsequent treatment on digital signals, and moreover, signal error code can be avoided.