On the design of high-performance wide-band continuous-time sigma-delta converters using numerical optimization
- 10 April 2006
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Circuits and Systems I: Regular Papers
- Vol. 53 (4) , 802-810
Abstract
Continuous-time (CT) sigma-delta (/spl Sigma//spl Delta/) modulators are growing increasingly popular in wide-band analog-digital conversion. High orders of quantization noise shaping, and multibit quantizers, are used to compensate for the low oversampling ratios in wide-band applications. These, however, add circuit complexities and excess loop delay that are detrimental to the /spl Sigma//spl Delta/ control loop. This paper presents an exact mathematical analysis technique, based on the CT-discrete time equivalence, that can take these effects into account. A design-by-optimization approach based on that analysis is used to compensate for these effects, avoid intractability issues and to gain flexibility in the design. It is also shown that it is advantageous not to fix the position of the quantization noise-shaping zeros in the signal band.Keywords
This publication has 9 references indexed in Scilit:
- Compensation of Finite Gain-Bandwidth Induced Errors in Continuous-Time Sigma–Delta ModulatorsIEEE Transactions on Circuits and Systems I: Regular Papers, 2004
- A Continuous-Time>tex<$Sigma Delta $>/tex<Modulator With 88-dB Dynamic Range and 1.1-MHz Signal BandwidthIEEE Journal of Solid-State Circuits, 2004
- CLANS: a high-level synthesis tool for high resolution data converters2003
- Excess loop delay in continuous-time delta-sigma modulatorsIEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 1999
- Optimal parameters for ΔΣ modulator topologiesIEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 1998
- Spectral shaping of circuit errors in digital-to-analog convertersIEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 1997
- Delta-sigma modulators employing continuous-time circuitryIEEE Transactions on Circuits and Systems I: Regular Papers, 1996
- A higher order topology for interpolative modulators for oversampling A/D convertersIEEE Transactions on Circuits and Systems, 1990
- A necessary and sufficient condition for quantization errors to be uniform and whiteIEEE Transactions on Acoustics, Speech, and Signal Processing, 1977