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Introduction   NIC stands for Negative Impedance Converter. It's one particular circuit configuration that can exhibit the phenomena of negative resistance. I'm going to look at that first and then, once we've done that, I'm going to use a pair of them to power a rather curious oscillator circuit due to Chua (the fun bit).   An Op Amp Negative Impedance Converter   As I'm sure you all know, a simple passive resistor has a property called resistance. The resistance is the con ...