Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume 51, Issue 11, Pages 2123-2132Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2004.836842
Keywords
amplifier; analog-digital (A/D) conversion; aperture error; digital correction; low power; sample-and-hold amplifier (SHA); time constant
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Design techniques for a low-power pipelined analog-to-digital converters (ADCs) without using a front-end sample-and-hold amplifier are presented. Two sampling topologies are compared that minimize aperture error by matching the time constant between signal paths. A digital correction expansion technique is also presented for multibit ADCs, which further increases tolerance to aperture error. Elimination of the front-end SHA can save more than half of the ADCs static power dissipation.
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