Patent ID: 7692471
Filing Date: 2010-04-06
Classification: H03F

Abstract:
1. A switched-capacitor circuit for performing a two-phase operation, including a sampling phase and an amplification phase, said switched-capacitor circuit comprising: an inverter with an input and an output, having a common source input transistor and a load transistor connected in series together, a gate of an input transistor serving as the input of the inverter, a node between the input transistor and the load transistor serving as the output of the inverter; a first capacitor whose first terminal is connected to the input of the inverter; a first switch which is controlled so as to connect the input of the inverter to the output of the inverter during the sampling phase, and which is controlled so as to disconnect the input of the inverter from the output of the inverter during the amplification phase; a second switch which is controlled to connect a second terminal of the first capacitor to an input voltage terminal which is supplied with an input voltage during the sampling phase, and which is controlled to connect a second terminal of the first capacitor to the output of the inverter during the amplification phase; a second capacitor with a first terminal is connected to a gate of the load transistor of the inverter and with a second terminal is connected to the second terminal of the first capacitor; and a third switch which is controlled so as to connect the gate of the of the load transistor to be supplied with a bias voltage during the sampling phase, and which is controlled so as to interrupt supply of the bias voltage to the gate of the load transistor during the amplification phase.