Electronics/Op-Amps/Non Linear Configurations/Negative Impedance Converter

Configuration

Operation

Creates a resistor having a negative value for any signal generator

• In this case, the ratio between the input voltage and the input current (thus the input resistance) is given by:

$R_{\text{in}}=-R_{3}{\frac {R_{1}}{R_{2}}}$

In general, the components $R_{1}$, $R_{2}$, and $R_{3}$ need not be resistors; they can be any component that can be described with an impedance.