IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
An offset compensated class-AB sample-and-hold amplifier using two sampling capacitors
Masayuki UnoShoji Kawahito
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2008 Volume 5 Issue 22 Pages 962-966

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Abstract

A new circuit topology of an offset compensated class-AB sample-and-hold (S/H) amplifier using two sampling capacitors is described. Conventional class-AB S/H amplifiers have high power efficiency, but suffer from offset deviations of the internal amplifier. The proposed class-AB S/H amplifier is free from the offset deviation of the internal amplifier, while achieving high power efficiency comparable to conventional class-AB S/H amplifiers. Simulation results show that systematic offset of the proposed S/H amplifier is comparable to that of an offset-compensated class-A S/H amplifier and has faster settling speed than that of the class-A type amplifier.

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