IEEJ Transactions on Electronics, Information and Systems
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
<Electrical and Electronic Circuit, LSI>
Analysis and Design of Operational Amplifier Stability Based on Routh-Hurwitz Stability Criterion
Jianlong WangGopal AdhikariNobukazu TsukijiHaruo Kobayashi
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2018 Volume 138 Issue 12 Pages 1517-1528

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Abstract

This paper proposes to use Routh-Hurwitz stability criterion for analysis and design of the opamp stability, when its small equivalent circuit is derived; this can lead to explicit stability condition derivation for opamp circuit parameters. In the theoretical part, we describe the equivalence between Nyquist and Routh-Hurwitz stability criteria under some conditions, and we deduce the relationship that between parameters of Routh-Hurwitz stability criterion and phase margin of the operational amplifier. In the verification part, our statement is confirmed with LTspice simulations at transistor level opamp circuits.

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© 2018 by the Institute of Electrical Engineers of Japan
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