Continuous-time-sigma-delta DAC using chopper stabalization

Continuous-time-sigma-delta DAC using chopper stabalization

A sigma-delta digital-to-analog converter comprises a current digital-to-analog converter (IDAC) stage which generates a current depending on an input digital signal. An output current-to-voltage converter converts the generated signal to a voltage on a continuous-time basis. The amplifier used in t...

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Hauptverfasser: O'BRIEN RICHARD THOMAS, MATAMURA ATSUSHI, LYDEN COLIN G, ADAMS ROBERT W, MORROW PAUL JOHN, MINOGUE PASCHAL THOMAS, MANSSON HANS JOHAN OLAF, CHAMARRO MARTI MARIA DEL MAR, ABO ANDREW, KEANE MIKE DOMINIC
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
ELECTRICITY
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creator O'BRIEN RICHARD THOMAS
MATAMURA ATSUSHI
LYDEN COLIN G
ADAMS ROBERT W
MORROW PAUL JOHN
MINOGUE PASCHAL THOMAS
MANSSON HANS JOHAN OLAF
CHAMARRO MARTI MARIA DEL MAR
ABO ANDREW
KEANE MIKE DOMINIC
description A sigma-delta digital-to-analog converter comprises a current digital-to-analog converter (IDAC) stage which generates a current depending on an input digital signal. An output current-to-voltage converter converts the generated signal to a voltage on a continuous-time basis. The amplifier used in the output current-to-voltage converter is chopper-stabilized. The converter can be single bit or multi-bit. The IDAC stage can be implemented with a pair of branches, a first branch comprising a first biasing current source and a second branch comprising a second biasing current source. The biasing current sources can be chopper-stabilized by connecting the bias current sources to the output current-to-voltage converter by a set of switches. The switches connect the biasing current sources to the output current-to-voltage converter in a first configuration and a second, reversed, configuration. This modulates flicker noise contributed by the bias current sources to the chopping frequency. from where it can be removed by filtering downstream of the current-to-voltage converter.
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subjects BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
ELECTRICITY
title Continuous-time-sigma-delta DAC using chopper stabalization
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