Patent ID: 8112057

Claim:
A sampling mixer comprising: a history capacitor which integrates a received signal that is converted into current in a continuous time; a plurality of rotation capacitors which are connected to the history capacitor for a predetermined time, and integrates the received signal; and a buffer capacitor which integrates signals discharged from the plurality of rotation capacitors, wherein, when signals that are integrated by the plurality of rotation capacitors are discharged to the buffer capacitor, a quantity of the plurality of rotation capacitors that are connected at a time to the buffer capacitor is changed; wherein the plurality of rotation capacitors are eight rotation capacitors; wherein the rotation capacitors are connected at a time to the buffer capacitor every four capacitors, two capacitors, or one capacitor; wherein, when the rotation capacitors are connected at a time to the buffer capacitor every two capacitors, four groups in which the rotation capacitors are combined every two capacitors integrate the received signal sequentially; and wherein, when the rotation capacitors are connected to the buffer capacitor every capacitor, each of the rotation capacitors integrates the received signal sequentially.