公开(公告)号：US09935643B1

公开(公告)日：2018-04-03

申请号：US15453567

申请日：2017-03-08

Applicant: Marvell International Ltd.

Inventor： Nick C. Chang ,  Kenneth Thet Zin Oo ,  Wyant Chan ,  Pierte Roo

IPC: H03M1/00 ,  H03M1/80 ,  H03M1/06 ,  H03M1/12

CPC classification number: H03M1/462 ,  H03M1/00 ,  H03M1/06 ,  H03M1/0695 ,  H03M1/12 ,  H03M1/80 ,  H03M1/804

Abstract: A successive-approximation register (SAR) analog-to-digital converter (ADC) includes a SAR circuit configured to generate a digital code based on an analog input signal. A digital-to-analog converter (DAC) is configured to convert the digital code to an analog voltage. The SAR circuit is further configured to generate a digital output signal based on a comparison between the analog input signal and the analog voltage. A first capacitor is configured to provide a reference voltage to the DAC. An adaptive charging module is configured to stabilize the reference voltage provided to the DAC by selectively connecting to a supply voltage during a first operating phase of the ADC to store a charge in the adaptive charging module and selectively connecting to the first capacitor during a second operating phase of the ADC to combine the charge stored in the adaptive charging module with a charge of the first capacitor.