IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
Digital-tuning of RC time constant in Multi-Bit continuous-time Delta-Sigma modulators
Hossein Shamsi
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2008 Volume 5 Issue 17 Pages 662-667

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Abstract

In this paper an RC time constant digital-tuning method is proposed for multi-bit continuous-time Delta-Sigma modulators. In this approach the effects of the imprecise RC time constant are compensated in digital domain without any requirement to the conventional analog tuning circuitries. In this method, acquiring the response of the loop-filter of the modulator to a known input signal, the actual loop-gain of the modulator is estimated. Comparing the actual loop-gain and the ideal loop-gain, a proper digital IIR (impulse invariant response) filter is inserted in the feedback path of the modulator. Analytic formulas and MATLAB simulations prove that the proposed method compensates the detrimental effects of the imprecise RC time constant appropriately.

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© 2008 by The Institute of Electronics, Information and Communication Engineers
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