Abstract: This research presents a new calibration method for IQ channel amplitude and phase imbalance in a sideband separation receiver.In the new method，the equation set is established based on the rejection ratio difference and the information of gain imbalance between different curves in the separation rejection ratio curve cluster.Then，the solution process is derived，and the aim that calibrating the receivers only by adjusting the digital back-end calibration coefficient is accomplished.This study conducts MATLAB numerical simulation experiments based on the proposed calibration method.The simulation results demonstrate that the method achieves a separation rejection ratio exceeding 80 dB,thereby validating the feasibility and effectiveness of the calibration method.The new method solves the defect that the traditional calibration method of the sideband separation receiver needs to obtain both amplitude and phase information at the IF port in order to realize the calibration of the receiver.

Key words: Superheterodyne receiver, Image rejection ratio, Calibration factor