A Topological Condition for an RC Active Circuit Containing Op-amps to be Unstable

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  • Ogata Masato
    Department of Computer Science and Communication Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu University
  • Nishi Tetsuo
    Department of Computer Science and Communication Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu University

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  • Topological Condition for an RC Active Circuit Containing Op amps to be Unstable

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This paper deals with the instability of RC active circuits containing non-ideal op-amps. It is very often that, when we design a circuit with a prescribed transfer function, installed RC active circuits are unstable, even though the designed transfer function itself is stable. One of the reasons for it is the existence of inevitable deviations of circuit element characteristics from ideal ones. In this paper we assume that the voltage gain of each op-amp is represented by the one-pole model and give a topological sufficient condition for the denominator polynomial of RC active circuits with these op-amps to be able to possess negative coefficient terms.

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