Design of Folded Cascode Operational Amplifier with Power Optimization using Geometric Programming

This paper presents a design of Folded Cascode operational amplifier with power optimization using Geometric Programming. Operational Amplifiers are the backbone for many analog circuit designs. The architecture of folded-cascode op-amp is commonly used in many analog applications. The cascode arrangement has high open-loop voltage gain in low frequency range that makes it easy to be designed as a high-speed operational amplifier. The basic idea of the folded-cascode opamp is to apply cascode opamp transistors to the input differential pair. In this study, the main concepts of power optimization using geometric programming are introduced. Geometric Programming, a method for optimizing and automating component and transistor sizing will apply to the power optimization of Folded Cascode operational amplifier. The simulation of the folded cascode circuit is done using TSPICE simulation tool and 0.035 ?m CMOS technology is used. Design of the circuit and simulation results are presented demonstrating the amplifier power optimization.