GAIN ASYMMETRY CHARACTERIZING CIRCUIT AND METHOD FOR DETERMINING CHARACTERISTICS OF GAIN ASYMMETRY POSSESSED BY TRANSMITTER

摘要

A gain asymmetry characterizing circuit for determining characteristics of gain asymmetry possessed by a transmitter includes a baseband loopback path, a test signal generating unit and a gain asymmetry measuring unit. The baseband loopback path is coupled to a baseband node on a first transmission path of the transmitter. The test signal generating unit is arranged to generate a first differential baseband test signal pair to the first transmission path. The first differential baseband test signal pair includes a first baseband signal and a second baseband signal. During a first period, the first baseband signal and the second baseband signal are fed into a positive input node and a negative input node of the first transmission path, respectively. During a second period, the second baseband signal and the first baseband signal are fed into the positive input node and the negative input node of the first transmission path, respectively.

主权项

1. A gain asymmetry characterizing circuit for determining characteristics of gain asymmetry possessed by a transmitter, comprising:
a baseband loopback path, coupled to a baseband node on a first transmission path of the transmitter; a test signal generating unit, arranged to generate a first differential baseband test signal pair to the first transmission path, wherein the first differential baseband test signal pair includes a first baseband signal and a second baseband signal; during a first period, the first baseband signal and the second baseband signal are fed into a positive input node and a negative input node of the first transmission path, respectively; and during a second period, the second baseband signal and the first baseband signal are fed into the positive input node and the negative input node of the first transmission path, respectively; and a gain asymmetry measuring unit, arranged to measure a response of a positive sideband of the gain asymmetry according to a first baseband loopback signal received from the baseband loopback path during one of the first period and the second period, and measure a response of a negative sideband of the gain asymmetry according to the first baseband loopback signal received from the baseband loopback path during the other of the first period and the second period.