Patent ID: 7768438

Claim:
A sample and integrate circuit, comprising: a first switching device having a first state and a second state, the first switching device including a first terminal and a second terminal, wherein the first terminal of the first switching device is configured to communicate with a first input voltage in response to the first switching device being in the second state, and communicate with a first voltage reference in response to the first switching device being in the first state; a first capacitance in communication with the second terminal of the first switching device; a second capacitance; a second switching device having a first state and a second state, the second switching including a first terminal and a second terminal, wherein the first terminal of the second switching device is configured to communicate with a second input voltage in response to the second switching device being in the first state, and communicate with a second voltage reference in response to the second switching device being in the second state; a third capacitance in communication with the second terminal of the second switching device; a fourth capacitance; and an amplifier having a first input and a second input, wherein the first input of the amplifier is in communication with the first capacitance and the second capacitance, and the second input of the amplifier is in communication with the third capacitance and the fourth capacitance.