VLSI IMPLEMENTATION OF NON-LINEAR CIRCUITS

Abstract

The design of analog circuits with reduced power consumption, components count, low power supply, better accuracy and less propagation delay is a challenging task. A lot of work has been done on non linear circuits using CMOS technology. The least power consumption and highest fidelity is possible by using CMOS- Operational Transresistance Amplifier (OTRA) instead of Op-amp. As a consequence, the CMOS based circuits approach has been area of interest and challenge to provide advantages of higher bandwidth, lower power consumption, higher slew rates, improved linearity, and better accuracy. This report describes the implementation of some non linear circuits and their applications based on Operational Transresistance Amplifier (OTRA) using CMOS technology.

The operational transresistance amplifier (OTRA) is an amplifier which provides an output voltage with inputs as two differential currents. Thus, it is a current controlled voltage source. The transresistance required is very high so as to realize open loop circuits such as comparator and closed loop circuits such as filters.

In this work, non linear circuits such as multiplier, squarer, dsb-sc modulator, frequency multiplier has been implemented. A frequency mixer circuit and relaxation oscillator using OTRA has been implemented.