What do you mean by negative impedance converter, Electrical Engineering

Q. What do you mean by Negative Impedance Converter?

The op-amp circuit of Figure causes a negative resistance Rin between the input terminal and ground. In the more general case, when R is replaced by an impedance Z, the circuit gives a negative impedance. Using ideal op-amp techniques, one has

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744_Negative Impedance Converter1.png

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