Title: Low mid frequency wireless receiver of automatic calibration circuit with image suppression
Application Number: 200510026341 Application Date: 2005.06.01
Publication Number: 1874167 Publication Date: 2006.12.06
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04B1/26,H04B1/10,H03D7/16
Applicant(s) Name: Dingxin Communication (Shanghai) Co., Ltd. Address: 201203
Inventor(s) Name: Zhang Zhaofeng, Xie Tingting, Yang Guanghui
Attorney & Agent: wang ji
Abstract:
     Radio receiver in low, medium frequencies includes voltage-controlled oscillator, diaschistic frequency divider, low noise amplifier, first mixer, second mixer, image rejection unit, image frequency interference generator, and control sequence searcher for image rejection. Through control sequence outputted from the said searcher, the radio receiver carries out calibration for coarse, fine adjustment and amplitude of phase of image frequency interference automatically so as to obtain optimal control sequence for image rejection as well as make capacity of calibration circuit for restraining image frequency interference reach optimum. Being simple structure of circuit, the invention is applicable to radio receiver in medium frequency directly.
Time: 21
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