Apparatus and methods for anti-aliasing in electronic circuits

摘要

A circuit operating with a switching clock signal and a sampling clock signal can have one or more of its switching and sampling clock signals periodically phase-reversed. The period of phase reversal can be greater than twice the period of the original switching and/or sampling clock signal, and in certain configurations the switching and sampling clock signals can be synchronized. With a selection of phase reversal period (or frequency), aliasing frequency components of the mixed signal from the switching and sampling clock signals can be removed.

主权项

1. An apparatus comprising:
a switching circuit configured to receive a first clock signal and to generate an output signal, wherein the switching circuit comprises a first switch configured to receive the first clock signal, wherein the first clock signal is configured to control a switching operation of the switching circuit; a sampling circuit configured to receive a second clock signal and the output signal, wherein the sampling circuit comprises a second switch configured to receive the second clock signal, wherein the second clock signal is configured to control a sampling operation of the sampling circuit; and a first clock modification circuit configured to receive a first input clock signal and to generate a first modified clock signal by periodically reversing a phase of the first input clock signal, wherein the first modified clock signal comprises either the first clock signal or the second clock signal.