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Floating gyrator having a current cancellation circuit

  • US 4,245,202 A
  • Filed: 06/04/1979
  • Issued: 01/13/1981
  • Est. Priority Date: 06/04/1979
  • Status: Expired due to Term
First Claim
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1. A network for simulating an ungrounded inductor which comprises:

  • a single operational amplifier gyrator circuit having an ungrounded port and a grounded port, said ungrounded port being terminated in a capacitor C so as to provide an input impedance, looking into the grounded port, which simulates an inductor, and in which a current i2 developed in said single operational amplifier appears at the grounded terminal of said grounded port; and

    a current cancellation circuit connected to said gyrator circuit, said current cancellation circuit deriving a current i3 which is equal to but opposite in sign from said i2 current, said i3 current being applied to said grounded terminal so as to effectively cancel the i2 current, whereby a simulated ungrounded inductor is obtained.

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