Circuit for eliminating signal amplitude mismatch on orthogonal signal path
Title：
Circuit for eliminating signal amplitude mismatch on orthogonal signal path
Application Number：
 200410037724
Application Date：
 2004/05/10
Announcement Date：
 2005/01/26
Pub. Date：
 2007/06/06
Publication Number：
 1571286
Announcement Number：
 1320775
Grant Date：
 2007-6-6
Granted Pub. Date：
 2007-6-6
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 H04B 1/10, H04B 1/16
Applicant(s)：
 Tsinghua University
Inventor(s)：
 Li Yongming, Fan Jun, Liao Qing
Key Words：
 Circuit, eliminate, signal amplitude, mismatch, orthogonal signal path
Abstract：
 The invention relates to a signal amplitude mismatch eliminating circuit in orthogonal signal channel, including: two power detectors connected at the output ends of I and Q channels in the orthogonal signal channel, respectively, are used to detect the output powers of I and Q channels; a subtracter connected with the output end of both the two power detects is used to calculate the difference between I and Q channel powers; a VGA control signal generator connected with output end of the subtracter is used to generate gain control signals of I and Q channel VGAs, respectively to adjust VGA gains and equalize the powers of I and Q channel output signals. The invention can better solve the amplitude mismatch problem of orthogonal signal in the receiver and has the advantages of increasing process allowance and reducing communication code error rate.
Claim：
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PCT：
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