Patent ID: 8513982
Filing Date: 2013-08-20
Classification: G11C

Abstract:
1. A sample and hold circuit configured to operate in a first phase and a second phase, comprising: a first capacitor; a second capacitor; an operational amplifier having an input and an output; and a plurality of switches selectively coupling the first capacitor, the second capacitor and the operational amplifier, wherein the plurality of switches are configured to receive a plurality of control signals such that in the first phase the first capacitor is configured to be coupled between an input of the sample and hold circuit and ground and the second capacitor is configured to be coupled between the input of the operational amplifier and the output of the operational amplifier, and in the second phase the first capacitor is configured to be coupled between the input of the operational amplifier and the output of the operational amplifier and the second capacitor is configured to be coupled between the output of the operational amplifier and ground, wherein a first switch of the plurality of switches is directly coupled between the first capacitor and the input of the sample and hold circuit, a second switch of the plurality of switches is directly coupled between the first capacitor and the output of the operational amplifier, a third switch of the plurality of switches is directly coupled between the first capacitor and the input of the operational amplifier, a fourth switch of the plurality of switches is directly coupled between the first capacitor and ground, a fifth switch of the plurality of switches is directly coupled between the input of the operational amplifier and the second capacitor, and a sixth switch of the plurality of switches is directly coupled between the second capacitor and ground.