Design of Voltage Amplifiers with optimization of Multiple Design Parameters

Abstract

In the current age of having sophisticated appliances with sophisticated circuits, it becomes necessary to have circuit designs that are exploited to their full potential by making minimal changes in their basic designs. Low Power, high gain, high voltage swing and stable operating voltage amplifiers are required at various stages in these appliances. Therefore, the paper focuses on improving designs that have two stages. The three designs, namely, the simple two stage operational amplifier, the two stage operational amplifier with cascoding in the inner stage and lead compensation, and the two stage operational amplifier with cascoding in the inner stage, lead compensation and gain boosting are compared. The circuits are designed and simulated using the GPDK045 and Analog Library in the Cadence Virtuoso Design Environment with Length of MOSFETs as 180nm and VDD as 2V. Out of the three methods, the two stage operational amplifier with cascoding in the inner stage and lead compensation is found to give the highest unity gain bandwidth of 1.1436 GHz and the method with gain boosting is found to give the highest DC Gain of 117.1087dB. The corresponding phase margin and power dissipation of the two methods are 57.8963 degrees, 57.3776 degrees and 0.69mW, 0.235mW.