ENHANCING THE DC-GAIN OF THE OPERATIONAL AMPLIFIER BY THE USE OF POSITIVE FEEDBACK METHODS

Abstract

One of the key components of integrated systems are operational amplifiers, or Op- amps. Band gap voltage references, digital-to-analog converters, sample-and-hold circuits, and very precise analog-to-digital converters are just a few of the uses for operational amplifiers with high speed and gain. Presenting the architecture of a high DC-gain operational trans-conductance amplifier (OTA) is the aim of this study. In order to do this, the output resistance and, consequently, the DC-gain are increased using the positive feedback technique. Other operational amplifier characteristics, such unity gain bandwidth and stability, are unaffected by the suggested configuration. Some simulations are run in a 0.18 μm CMOS process with a supply voltage of 1.4 V in order to evaluate the performance of the suggested structures. The results of the simulation demonstrate that the suggested operational amplifier performs better than the current constructions.