AN ANALOG APPROACH TO COMPENSATE FOR OpAmp OFFSET AND FINITE GAIN IN SC CIRCUITRY: A CASE STUDY OF A CYCLIC RSD ADC |
|---|
| Reinhard Kindt, Richard Ižák |
- Abstract:
- Design of high-resolution Nyquist rate A/D converter necessitates the usage of advanced circuit techniques to compensate for arising analog errors. In switched capacitor ADC, besides the well know techniques such as bottom plate sampling, mismatch-independent and redundant (RSD: 1.5 bit/stage) conversion for the elimination of charge injection, capacitor mismatch, comparator and offset sensitivity, respectively, the most utilised circuit techniques are those for OpAmp’s offset and finite gain errors cancellation. An alternative technique for compensation of the errors due to finite gain and offset of Opamp in SC circuits is proposed. This novel method features a charge addition and is compared to so far used approaches based on voltage addition. The concept and the results of a 5 V CMOS implementation of cyclic RSD ADC with ratio-independent SC technique using this correction method are discussed.
- Keywords:
- cyclic/algorithmic analog-digital converter, switched capacitor circuit, amplifier’s finite gain and offset
- Download:
- IMEKO-TC4-2002-054.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC4
- Event name:
- TC4 Conference and Workshop 2002
- Title:
- 4th International Conference on Advanced A/D and D/A Conversion Techniques and their Applications (together with 7th IMEKO TC4 Workshop on ADC Modelling and Testing)
- Place:
- Prague, CZECH REPUBLIC
- Time:
- 26 June 2002 - 28 June 2002