Patent ID: 8179185

Claim:
A sampling mixer, comprising: a transconductance amplifier which converts a received signal into a current; a first sampling switch connected to the transconductance amplifier, for discretizing the signal that is converted into the current on a time axis; a second sampling switch connected to the transconductance amplifier, for discretizing the signal that is converted into the current on a time axis in phase that is different from the first sampling switch by 180 degree; a first history capacitor for integrating a signal that is discretized by the first sampling switch; a second history capacitor for integrating a signal that is discretized by the second sampling switch; a first rotate capacitor connected to the first history capacitor for a predetermined time, for integrating the signal that is discretized by the first sampling switch; a second rotate capacitor connected to the second history capacitor for a predetermined time, for integrating the signal that is discretized by the second sampling switch; a buffer capacitor for integrating the signals discharged from the first and second rotate capacitors; a first discharge switch for discharging the signal integrated in the second rotate capacitor to the first rotate capacitor; and a second discharge switch for discharging the signal integrated in the first rotate capacitor to the second rotate capacitor.