Method and apparatus for closed loop control of supply and/or comparator common mode voltage in a successive approximation register analog to digital converter

Patent metadata

Field	Value
Publication number	US-8994568-B2
Application number	US-201313782335-A
Country	US
Kind code	B2
Filing date	Mar 1, 2013
Priority date	Mar 1, 2013
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

A method and apparatus for controlling supply voltage for a successive approximation register analog to digital converter and comparator common mode voltage. The method comprises: measuring a successive approximation register conversion time; comparing the successive approximation register conversion time with a desired conversion time; and if necessary, performing a closed loop adjustment of at least one of the supply and/or comparator common mode voltage. The apparatus consists of a common mode voltage and regulator correction module. The common mode voltage and regulator correction module includes a phase frequency detector, a charge pump and may include a transconductance cell.

First claim

What is claimed is:

1. A method for controlling supply voltage for a successive approximation register (SAR) analog to digital converter (ADC) comparator common moved voltage, comprising:
measuring a SAR conversion time;
comparing the SAR conversion time to a desired conversion time; and
adjusting in closed loop fashion at least one of a supply and comparator common mode voltage.

2. The method of claim 1 , wherein both the supply and the comparator commo…

Assignees

• Qualcomm Inc

Inventors

• Nagarajan Karthik
• Alladi Dinesh J

Classifications

• H03M1/0604 Primary

  Electricity · mapped topic

• G06F1/3296

  Physics · mapped topic

• H03M1/46

  Electricity · mapped topic

• H03M1/12 Primary

  Electricity · mapped topic

• H03M1/00

  Electricity · mapped topic