Deriving stability criteria for nonlinear circuits with application to worst-case noise margin of I2L

A simplified method of deriving stability criteria for nonlinear circuits is introduced. Unlike the conventional approach which requires construction of a small-signal equivalent circuit and identification of loops, only the basic nonlinear circuit equations are needed. The method is applied to the calculation of the worst-case static noise margin of I2L, which is shown to be much smaller than a recently published result.     

Generalized translinear circuit principle

It is shown that a generalized interpretation of the translinear (TL) principle leads quite naturally to an extension to MOS circuits. It is shown that two distinct classes of TL circuits exist, one suitable for bipolar and the other for MOS implementation. The MOS-translinear (MTL) circuit principle is derived and an initial classification of simple MTL circuits is proposed. Some examples are given of MTL circuits synthesizing nonlinear functions