NIC as an extremely simple symmetrical circuit consisting of only three components - two resistors and an op-amp. The picture shows the remarkable feature of this circuit solution to be universal: if we look (drive) at this NIC from the left, it behaves as a current-inversion negative impedance converter (INIC); if we look (drive) at it from the right, it behaves as a voltage-inversion negative impedance converter (VNIC).