Maple V: programming guide
A multistage closed-loop sigma-delta modulator (MSCL)
Analog Integrated Circuits and Signal Processing
Digital Control of Dynamic Systems
Digital Control of Dynamic Systems
A behavioral simulation tool for continuous-time ΔΣ modulators
Proceedings of the 2002 IEEE/ACM international conference on Computer-aided design
Nyquist-criterion based design of a CT ΣΔ-ADC with a reduced number of comparators
Integration, the VLSI Journal
Accurate time-domain simulation of continuous-time sigma-delta modulators
IEEE Transactions on Circuits and Systems Part I: Regular Papers
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A methodology for analysis and synthesis of lowpass sigma-delta (ΣΔ) converters is presented in this paper. This method permits the synthesis of ΣΔ modulators employing continuous-time filters from discrete-time topologies. The analysis method is based on the discretization of a continuous-time model and using a discrete simulator, which is more efficient than an analog simulator. In our analysis approach, the influence of the sample and hold block and non-idealities of the feedback DAC can be systematically modeled by discrete-time systems. Finally, a realistic design of a second-order ΣΔ modulator with a compensation of the non-ideal behavior of the DAC is given. Moreover, simulation results show a good agreement with the theoretical predictions.