2018 年 138 巻 12 号 p. 1517-1528
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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