Analysis and Design of Regenerative Comparators for Low Offset and Noise

We make the case that in most comparators, offset and noise are determined by a dynamic preamplifier always embedded ahead of a regenerative latch. An analysis of this amplifier follows, from which simple expressions are obtained for input-referred offset and noise bandwidth. Practical circuit metho...

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Veröffentlicht in:	IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2019-08, Vol.66 (8), p.2817-2830
Hauptverfasser:	Xu, Hao, Abidi, Asad A.
Format:	Artikel
Sprache:	eng
Schlagworte:	analog-digital conversion analog-digital integrated circuits Bandwidth Capacitors Circuit noise circuit theory Comparators coupled mode analysis Field effect transistors Integrated circuit modeling Latches Topology
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Beschreibung
Zusammenfassung:	We make the case that in most comparators, offset and noise are determined by a dynamic preamplifier always embedded ahead of a regenerative latch. An analysis of this amplifier follows, from which simple expressions are obtained for input-referred offset and noise bandwidth. Practical circuit methods to compensate offset and lower noise become evident. We compare the StrongArm comparator with the double tail topology, and identify requirements for correct operation.
ISSN:	1549-8328 1558-0806
DOI:	10.1109/TCSI.2019.2909032