COMPLEX BANDPASS FILTER WITH I/Q PHASE MISMATCH COMPENSATION FUNCTION

摘要

A complex bandpass filter is provided to cut down the time and the cost required for the phase compensation by compensating the phase of I and Q signal. The first low pass filter comprises the first input part delivering the first OP amp(601); the first input part delivering the I channel input signal to the input terminal of the first OP amp; the first feedback unit delivering I channel output signal to the input terminal of the first OP amp. The second low pass filter comprises the second operational amplifier; the second input part delivering the Q channel input signal to the input terminal of the second operational amplifier; the second feedback unit delivering the Q channel output signal to the input terminal of the second operational amplifier. The pole transform unit comprises the first intersection feedback unit delivering the Q channel output signal to the input terminal of the first OP amp; the second intersection feedback unit delivering the I channel output signal to the input terminal of the second operational amplifier. The phase compensation part comprises the first compensation delivering the Q channel input signal to the input terminal of the first OP amp; the second compensation delivering the I channel input signal to the input terminal of the second operational amplifier.