DC imbalance calibration system and DC imbalance calibration method

• Main Authors: ZHANG CHUN, LI FULE, ZHANG LINGWEI, WANG ZHIHUA, DONG JINGJING, JIANG HANJUN, WEI JIANJUN
• Format: Patent
• Language: Chinese; English
• Published: 26.02.2014
• Subjects: BASIC ELECTRONIC CIRCUITRY; CONTROL OF AMPLIFICATION; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

The invention provides a DC imbalance calibration system. The DC imbalance calibration system comprises a receiver module, a sampling comparison module, a digital controller and an analog-to-digit converter, wherein the receiver module comprises a radio frequency circuit and a DC imbalance circuit set in electrical connection with the output end of the radio frequency circuit; the DC imbalance circuit set comprises n stages of DC imbalance circuits connected in serials; the receiver module respectively outputs DC common mode voltages Vopi and Voni through the positive output end i and the negative output end i of an i-th DC imbalance circuit; the sampling comparison module is used for obtaining a determination result based on a delta Vopi and a delta Voni; the digital controller is used for sending corresponding input control words to the analog-to-digit converter according to the determination result, and sending corresponding gain control instructions to the receiver module; and the analog-to-digit converte