发明名称 |
Continuous-time-sigma-delta DAC using chopper stabalisation |
摘要 |
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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申请公布号 |
US2006139193(A1) |
申请公布日期 |
2006.06.29 |
申请号 |
US20050228114 |
申请日期 |
2005.09.16 |
申请人 |
MORROW PAUL J;CHAMARRO MARTI MARIA D M;LYDEN COLIN G;KEANE MIKE D;ADAMS ROBERT W;O'BRIEN RICHARD T;MINOGUE PASCHAL T;MANSSON HANS J O;MATAMURA ATSUSHI;ABO ANDREW |
发明人 |
MORROW PAUL J.;CHAMARRO MARTI MARIA D.M.;LYDEN COLIN G.;KEANE MIKE D.;ADAMS ROBERT W.;O'BRIEN RICHARD T.;MINOGUE PASCHAL T.;MANSSON HANS J.O.;MATAMURA ATSUSHI;ABO ANDREW |
分类号 |
H03M3/00 |
主分类号 |
H03M3/00 |
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