Patent ID: 8599968

Claim:
A sampling circuit comprising: an in-phase and quadrature (IQ) generating circuit that outputs an in-phase (I) signal and a quadrature (Q) signal having phases 90 degrees shifted from one another, by sampling an input signal; a plurality of discrete time of circuits connected to an output stage of the IQ generating circuit in parallel and performs weighting of outputs from the IQ generating circuit; an adding circuit that is connected to an output stage of the plurality of discrete time circuits and adds outputs from each of the discrete time circuits which have performed weighting by electrical charge sharing of the discrete time circuits; and a digital controller that outputs control signals to control operation of the discrete time circuits and operation of the adding circuit; wherein each of the discrete time circuits has a rotate capacitor unit connected to one of I+, Q+, I− and Q− output stages of the IQ generating circuit and a dump switch directly connected to an output stage of the rotate capacitor unit.