Designing of nonlinear controllers using BJT Gilbert cells

Abstract

Nowadays nonlinear functions play a significant role in some fields like communication and signal processing. One of important problems that can be solved with them is designing nonlinear functions that are applicable in nonlinear control and effective control. Using discrete time nonlinear controllers cause some problems like instability that can be eliminated using continuous time nonlinear controllers. The most essential block for creating nonlinear functions is a precision multiplier. In this article redesigning and simulating a precision multiplier block using BJT Gilbert cell to creating nonlinear functions like a sinusoidal function block is desirable.