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1. US7009541 - Input common-mode voltage feedback circuit for continuous-time sigma-delta analog-to-digital converter

Office
United States of America
Application Number 10970213
Application Date 21.10.2004
Publication Number 7009541
Publication Date 07.03.2006
Grant Number 7009541
Grant Date 07.03.2006
Publication Kind B1
IPC
H03M 3/00
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING, DECODING OR CODE CONVERSION, IN GENERAL
3Conversion of analogue values to or from differential modulation
CPC
H03M 3/356
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING; DECODING; CODE CONVERSION IN GENERAL
3Conversion of analogue values to or from differential modulation
30Delta-sigma modulation
322Continuously compensating for, or preventing, undesired influence of physical parameters
352of deviations from the desired transfer characteristic
354at one point, i.e. by adjusting a single reference value, e.g. bias or gain error
356Offset or drift compensation
H03M 3/454
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING; DECODING; CODE CONVERSION IN GENERAL
3Conversion of analogue values to or from differential modulation
30Delta-sigma modulation
39Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators
436characterised by the order of the loop filter, e.g. error feedback type
438the modulator having a higher order loop filter in the feedforward path
454with distributed feedback, i.e. with feedback paths from the quantiser output to more than one filter stage
H03M 3/464
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING; DECODING; CODE CONVERSION IN GENERAL
3Conversion of analogue values to or from differential modulation
30Delta-sigma modulation
458Analogue/digital converters using delta-sigma modulation as an intermediate step
464Details of the digital/analogue conversion in the feedback path
Applicants Analog Devices, Inc.
Inventors Nguyen Khiem
Agents Gauthier & Connors LLP
Priority Data 10970213 21.10.2004 US
Title
(EN) Input common-mode voltage feedback circuit for continuous-time sigma-delta analog-to-digital converter
Abstract
(EN)

A novel circuit is used to monitor the common-mode voltage at the summing junctions of the first integrator in a continuous-time ΣΔ ADC, wherein the circuit produces a control voltage which adjusts the quiescent current of the feedback DAC to compensate for any common-mode offset current. Since the adjustment takes place within the feedback DAC, there is no extra noise added to the differential signal path. The implementation provides for no degradation to the SNR of the converter.


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