Loop Delay Compensation in Bandpass Continuous-Time Modulators without Additional Feedback Coefficients

Abstract : Loop-delay is one of the major sources of instability and signal-to-noise ratio degradation in continuous-time band-pass /spl Sigma//spl Delta/ modulators. In this paper, we use the modified-z-transform technique to calculate the value of the additional feedback coefficient required to compensate for the loop-delay. It is shown that, in certain conditions, this additional feedback coefficient can be removed and the loop-delay is compensated only by modifying the modulator coefficients. This is illustrated by several examples of loop-delay compensation in 2nd, 4th and 6th order bandpass modulators.
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Hassan Aboushady, Marie-Minerve Rosset-Louërat. Loop Delay Compensation in Bandpass Continuous-Time Modulators without Additional Feedback Coefficients. IEEE International Symposium on Circuits and Systems (ISCAS), May 2004, Vancouver, Canada. pp.1124-1127, ⟨10.1109/ISCAS.2004.1328397⟩. ⟨hal-01521103⟩

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