QUADRATURE SIGNAL PHASE CONTROLLER FOR CONTROLLING PHASE

摘要

PURPOSE: A quadrature signal phase controller is provided to enhance the image rejection ratio of a receiver by consecutively and variably controlling the phase between a common mode signal and a quadrature phase signal. CONSTITUTION: A first phase shifter(30) combines each of common differential input signals and each of quadrature phase differential input signals in response to one or both of a first control signal and a second control signal. The first phase shifter generates phase-shifted first common mode differential output signals and phase-shifted first quadrature phase differential output signals. A second phase shifter(40) combines each of the common mode differential input signals and each of the quadrature phase differential input signals in response to one or both of the first control signal and the second control signal. The second phase shifter generates phase-shifted second differential output signals and phase-shifted second quadrature phase differential output signals.