Novel design technique for nonlinear MIS capacitors

A design technique is suggested in this paper for the realization of a generic nonlinear capacitor entirely from uniformly doped and standard MIS capacitors. A new capacitive element—capacitor doublet—is proposed which is used as the building block to achieve the required nonlinear capacitance. The method involves Q–V curve engineering to back trace the parameters of various doublets required to be connected in order to approximate the desired Q–V curve. One specific example of the design of nonlinear (logarithmic) capacitor required in a μ-law compander is discussed.