Basic Circuit and Analysis
INIC is a non-inverting amplifier (the op-amp and the voltage divider R1, R2 on the figure) with a resistor (R3) connected between its output and input. The op-amp output voltage is
The current going from the operational amplifier output through resistor toward the source is, and
So the input experiences an opposing current that is proportional to, and the circuit acts like a resistor with negative resistance
In general, elements, and need not be pure resistances (i.e., they may be capacitors, inductors, or impedance networks).
Read more about this topic: Negative Impedance Converter
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