Patent ID: 9455695
Filing Date: 2016-09-27
CPC Classification: H03K,H03M

Claim Text:
1. An analog-to-digital comparator, comprising: a differential amplifier unit wherein the differential amplifier unit receives a sampling signal and provides an output signal based on a voltage provided by the sampling signal, wherein the differential amplifier unit includes: an input stage wherein the input stage receives the sampling signal and integrates a current on integration nodes based on potentials of the sampling signal; a sense amplifier coupled with the integration nodes wherein the sense amplifier detects a potential difference and amplifies the potential difference to generate the output signal; and a charge injection circuit wherein the charge injection circuit comprises injection capacitors each of which is coupled with a respective one of the integration nodes, so that charges are selectively injected into the integration nodes, and wherein each of the injection capacitors of the charge injection circuit is coupled with one first terminal thereof with a respective one of the integration nodes, wherein by changing a potential on a second terminal of the injection capacitors during the integration cycle charges are injected into the integration nodes, and wherein the charge injection circuit injects equal charges into the integration nodes.