Rail to rail CMOS complementary input stage with only one active differential pair at a time

Maria Rodanas Valero; Alejandro Roman-Loera; Jaime Ramírez-Angulo; Nicolas Medrano; Santiago Celma

doi:10.1587/elex.11.20140392

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Rail to rail CMOS complementary input stage with only one active differential pair at a time

Maria Rodanas Valero, Alejandro Roman-Loera, Jaime Ramírez-Angulo, Nicolas Medrano, Santiago Celma

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Keywords: analog integrated circuits, CMOS integrated circuits, amplifiers, low-voltage low power design

JOURNAL FREE ACCESS

2014 Volume 11 Issue 12 Pages 20140392

DOI https://doi.org/10.1587/elex.11.20140392

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Abstract

A simple scheme for rail to rail op-amp operation is introduced. The input stage uses complementary differential pairs but only one pair is active at a time. It uses very compact control circuitry. Experimental verification is provided from a test chip prototype in 0.5 µm CMOS technology.

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