Parasitic resistance in non-Foster circuits caused by current conveyor frequency response

Current conveyors are useful for creating non-Foster circuit components such as negative capacitors. As with operational amplifiers, it is sometimes desirable to use phase compensation techniques to improve the phase margin and stability in these circuits. However, it is shown for negative capacitor applications that the frequency response in a current conveyor leads to undesired parasitic resistance and reduced quality factor, Q. Analysis of the circuit shows that current conveyor frequency response can cause such degraded performance. In addition, measured data for a CMOS implementation confirm the predicted deleterious effects of current conveyor frequency response on parasitic resistance and quality factor.