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2. Negative impedance converter - Wikipedia

   en.wikipedia.org/wiki/Negative_impedance_converter

   The negative impedance converter (NIC) is an active circuit which injects energy into circuits in contrast to an ordinary load that consumes energy from them.This is achieved by adding or subtracting excessive varying voltage in series to the voltage drop across an equivalent positive impedance.

3. Miller theorem - Wikipedia

   en.wikipedia.org/wiki/Miller_theorem

   A typical application is a negative impedance converter with voltage inversion (VNIC). [5] It is interesting that the circuit input voltage has the same polarity as the output voltage, although it is applied to the inverting op-amp input; the input source has an opposite polarity to both the circuit input and output voltages.

4. Negative resistance - Wikipedia

   en.wikipedia.org/wiki/Negative_resistance

   A common example of an "active resistance" circuit is the negative impedance converter (NIC) [45] [46] [115] [125] shown in the diagram. The two resistors R 1 {\displaystyle R_{\text{1}}} and the op amp constitute a negative feedback non-inverting amplifier with gain of 2. [ 115 ]

5. Foster's reactance theorem - Wikipedia

   en.wikipedia.org/wiki/Foster's_reactance_theorem

   For example, it is possible to create negative capacitance and inductance with negative impedance converter circuits. These circuits will have an immittance function with a phase of ±π/2 like a positive reactance but a reactance amplitude with a negative slope against frequency.

6. Current source - Wikipedia

   en.wikipedia.org/wiki/Current_source

   In the last example (Fig. 1), the Howland current source consists of an input voltage source, V IN, a positive resistor, R, a load (the capacitor, C, acting as impedance Z) and a negative impedance converter INIC (R 1 = R 2 = R 3 = R and the op-amp).

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