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Differential Dynamic Element Matching Analog-To-Digital Converter

Detailed Technology Description

Products: High resolution data converters optimized for use in single-poly CMOS integrated circuits. Technology: A 3.3V .5µ single-poly CMOS audio ADC Delta-Sigma modulator with 98dB Peak SINAD is realized which overcomes the inherent limitations placed on analog devices when incorporated in optimized digital environments. This invention provides improvements to conventional flash analog-to-digital converters (ADCs) as used in a variety of applications, including internal components within delta-sigma modulator circuits for performing very precise analog-to-digital conversion. Typically such precise devices require very linear capacitors and low-noise low-distortion amplifier circuits. Good quality ADCs have thus far been difficult to achieve within a single-poly CMOS environment. To overcome these limitations, the invention here sets out to implement two independent improvements: The first improvement is to realize a differential-input flash ADC using digital common-mode rejection wherein the output sequences from two non-differential flash ADCs are (i) differenced, and (ii) further processed, in the digital domain. The second improvement, is to effect comparator offset dynamic element matching as a means of reducing the deleterious effects of ADC error resulting from the inevitable non-zero offset voltages of the comparators from which a flash ADC is constructed. Status: Patented and successfully prototyped with accompanying design and layout files. Licenses are available.

Supplementary Information

Patent Number: US6816100B1
Application Number: US2000523509A
Inventor: Galton, Ian | Fogelman, Eric | Jensen, Henrick T.
Priority Date: 12 Mar 1999
Priority Number: US6816100B1
Application Date: 10 Mar 2000
Publication Date: 9 Nov 2004
IPC Current: H03M000106 | H03M000136 | H03M000304
US Class: 341155 | 341143 | 341144
Assignee Applicant: The Regents of the University of California
Title: Analog-to-digital converters with common-mode rejection dynamic element matching, including as used in delta-sigma modulators
Usefulness: Analog-to-digital converters with common-mode rejection dynamic element matching, including as used in delta-sigma modulators
Summary: For digital circuits such as mismatch-shaping multibit delta sigma modulator (claimed).
Novelty: Differential flash analog-to-digital converter for mismatch-shaping multibit delta sigma modulator, re-quantizes difference signal of converted digital signals to produce N-level quantized representation of difference signal

Industry

Electronics

Sub Category

Circuit Design

Application No.

6816100

Others

Tech ID/UC Case

22710/1998-114-0

Related Cases

1998-114-0

*Abstract

None

*IP Issue Date

Nov 9, 2004

*Principal Investigator

Name: Eric Fogleman

Department:

Name: Ian Galton

Department:

Name: Henrik Jensen

Department:

Country/Region

USA