Efficient technique for excess loop delay compensation in continuous-time ΔΣ modulators

A highly digital technique is proposed for excess loop delay (ELD) compensation in multi-bit continuous-time ΔΣ modulators. A digitally controlled reference switching matrix is used to replace the power-hungry signal adder and extra DAC driving the quantiser, which are commonly used in ELD compensat...

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Veröffentlicht in:	Electronics letters 2013-11, Vol.49 (24), p.1522-1523
Hauptverfasser:	Zhang, Y, Chen, C.H, Temes, G.C
Format:	Artikel
Sprache:	eng
Schlagworte:	Analog-digital conversion, digital-analog conversion, pcm coding Applied sciences Circuits and systems continuous time systems delta‐sigma modulation digitally controlled reference switching matrix ELD compensation Exact sciences and technology excess loop delay compensation highly digital technique Information, signal and communications theory matrix algebra multibit continuous‐time Î”Î£ modulators Signal and communications theory Telecommunications and information theory
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Beschreibung
Zusammenfassung:	A highly digital technique is proposed for excess loop delay (ELD) compensation in multi-bit continuous-time ΔΣ modulators. A digitally controlled reference switching matrix is used to replace the power-hungry signal adder and extra DAC driving the quantiser, which are commonly used in ELD compensation. With the proposed technique, the feedback DAC is embedded in the quantiser and implemented by a few switches. Thus, it allows low-voltage and low-power operation.
ISSN:	0013-5194 1350-911X 1350-911X
DOI:	10.1049/el.2013.3470