Patent ID: 7973586

Claim:
A sampling mixer, comprising: a first transconductance amplifier which converts a received signal into a current; a second transconductance amplifier which converts the received signal into a current, and has a transconductance that is an α-times transconductance of the first transconductance amplifier; a first sampling switch for sampling a signal that underwent the current conversion by the first transconductance amplifier; a second sampling switch for sampling a signal that underwent the current conversion by the second transconductance amplifier; a first history capacitor for integrating a signal that is sampled by the first sampling switch; a second history capacitor for integrating a signal that is sampled by the second sampling switch; a first rotate capacitor connected to the first history capacitor for a predetermined time, for integrating the signal converted into the current by the first transconductance amplifier; a second rotate capacitor connected to the second history capacitor for a predetermined time, for integrating the signal converted into the current by the second transconductance amplifier; a buffer capacitor for integrating the signal that is discharged from the first rotate capacitor; and a first discharge switch for discharging the signal that is integrated in the second rotate capacitor to the first rotate capacitor.