Patent ID: 7346325

Claim:
A receiver comprising: mixers which convert received signals having in-phase (I) and quadrature (Q) components with a first frequency into quadrature modulated signals with a second frequency; signal paths which at least amplify and output said quadrature modulated signals output from said mixers; a calibration circuit for phase and amplitude mismatch which calibrates phase and amplitude mismatches between the I and Q components of said quadrature modulated signals output through said signal paths; a frequency converter which, when said mixers or said signal paths selected output calibration signals having I and Q components with said second frequency instead of said quadrature modulated signals, converts said calibration signals into calibration signals with a third frequency higher than said second frequency; and an arithmetic operation circuit which calculates phase and amplitude mismatches between the I and Q components from the calibration signals with said third frequency output by said frequency converter and outputs calculation results, wherein said calibration circuit for phase and amplitude mismatch executes the calibration, using said calculation results.