Title：IQ mismatch corrction apparatus for quadrature downconversion receiver
Country：China
Patent No.：201110076268.X
Legal Status：Authorized
Inventor：Baoyong Chi, Yang Xu, Nan Qi, Zhihua Wang
Assignee：Tsinghua University
Address：Institute of Microelectronics,Tsinghua Univ. Beijing,10084
Filing Date：2011-03-29
Issue Date：2014-01-01
Abstract：
The invention discloses a mismatch calibrating device for I and Q channel signals of an orthogonal down-conversion receiver, which belongs to the technical field of frequency conversion receiver calibration. The device comprises two calibrating modules with same structures of an I channel and a Q channel, wherein each calibrating module comprises twelve MOS (Metal Oxide Semiconductor) transistors M1-M12, two load resistors R11 and R12, three adjustable resistors Rsp1, Rsp2 and Rsg and seven bias current sources I1-I7. The phase mismatch of I and Q channel signals of the orthogonal down-conversion receiver can be calibrated by adjusting resistance values of the first adjustable resistor Rsp1 and the second adjustable resistor Rsp2; and the amplitude mismatch of the I and Q channel signals of the orthogonal down-conversion receiver can be calibrated by adjusting a resistance value of the third adjustable resistor Rsg. The calibrating device improves the capability for inhibiting an image signal of the frequency conversion receiver and reduces the error rate of the receiver. A calibrating method is simple.
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