Device and method for amplification and noise compensation

摘要

A method and a device having amplification and noise reduction capabilities, the device may include (a) an amplifier; (b) an input circuit that includes multiple sampling circuits, (c) an error capacitor that is arranged to be charged by the amplifier, during a noise integration period, to an error voltage that is indicative of noise generated as a result of a sampling of first and second signals; and (d) a feedback circuit that is arranged to provide to the second input of the amplifier and in proximity to a beginning of second phase of operation, a feedback signal that represents the error voltage and thereby at least partially compensate for the noise.

主权项

1. A device having amplification and noise reduction capabilities, comprising:
an amplifier that comprises a first input, a second input and an output; an input circuit that is coupled to an input of the amplifier out of the first input and the second input; wherein the input circuit comprises:
a first sampling circuit that is arranged to sample a first signal (S1) during a first phase of operation and during a noise integration period;a second sampling circuit that is arranged to sample a second signal (S2) during a first phase of operation; anda third sampling circuit arranged to sample a third signal (S3) during a second phase of operation; an error capacitor that is coupled to the output of the amplifier; wherein the error capacitor is arranged to be charged by the amplifier, during the noise integration period, to an error voltage that is indicative of noise generated as a result of a sampling of the first and second signals; and a feedback circuit coupled between the error capacitor and the second input of amplifier; wherein the feedback circuit is arranged to provide to the second input of the amplifier and in proximity to a beginning of the second phase of operation, a feedback signal that represents the error voltage and thereby at least partially compensate for the noise.