Calibration method and calibration apparatus for calibrating mismatch between I-path and Q-path of transmitter/receiver

摘要

A method for calibrating mismatches of an in-phase signal path and a quadrature signal path of a transmitter, including: additionally configuration at least one mixer calibration coefficient at a transmitting part of the transmitter; obtaining at least one mixer testing signal from the transmitting part via loopback for spectrum analysis to derive at least one mixer spectrum analysis result; adjusting the mixer calibration coefficient of the transmitting part according to the mixer spectrum analysis result; and additionally utilizing an in-phase signal path finite impulse response filter and a quadrature signal path finite impulse response filter to calibrate mismatches between a low pass filter of the in-phase signal path of the transmitting part of the transmitter and a low pass filter of the quadrature signal path of the transmitting part of the transmitter. A similar mismatch calibration operation may be applied to a receiver.

主权项

1. A method for calibrating mismatches between a first signal path and a second signal path of a receiver, wherein one of the first signal path and the second signal path is an in-phase signal path; and the other is a quadrature signal path, and the method comprises:
additionally configuring at least one mixer calibration coefficient at a receiving terminal of the receiver; outputting the mixer test signal at a transmission terminal of the receiver as a first transmission signal, and looping back the first transmission signal and performing spectrum analysis upon the received first transmission signal after it passes through the mixer calibration coefficient, for deriving at least one mixer spectrum analysis result; adjusting the mixer calibration coefficient of the receiver according to the mixer spectrum analysis result to derive a final value of the mixer calibration coefficient for calibrating a mismatch between a first mixer of the first signal path and a second mixer of the second signal path; and performing a first signal path finite impulse response (FIR) filtering process upon the first signal path by additionally utilizing a first signal path FIR filter, and performing a second signal path FIR filtering process upon the second signal path by additionally utilizing a second signal path FIR filter, to calibrate a mismatch between a first filter of the first signal path and a second filter of the second signal path.