公开(公告)号：US20200295773A1

公开(公告)日：2020-09-17

申请号：US16702090

申请日：2019-12-03

Applicant: Texas Instruments Incorporated

Inventor： Rahul Vijay Kulkarni ,  Shridhar More ,  Amal Kumar Kundu ,  Minkle Eldho Paul

IPC: H03M1/10

Abstract: An analog to digital (A/D) converter includes a capacitor array having respective first terminals selectively coupled to a reference voltage or ground via a plurality of switches and having respective second terminals coupled to a sample and hold (S/H) output. The A/D converter also includes a voltage comparator having a first input coupled to the S/H output and having a second input coupled to a bias voltage. The voltage comparator is configured to output a comparison voltage responsive to a sampled charge at the S/H output and the bias voltage. The A/D converter also includes a successive approximation register coupled to receive the comparison voltage and configured to output an approximate digital code responsive to the comparison voltage, wherein the approximate digital code is varied by controlling an equivalent capacitance of the capacitor array.