IMPLEMENTATION OF THE FOLDED CASCODE OTA IN VARIOUS OPERATING DOMAINS USING THE GM ID APPROACH

Abstract

The study outlines a technique for designing folded cascode operational transconductance amplifiers (OTAs) that is optimised. Using the gm/ID technique, the design is carried out in several operational zones, including weak inversion, strong inversion, and moderate inversion, with the goal of optimising the size of MOS transistors. The developed folded cascode OTA attains a DC gain of 77.5 dB and a unity-gain frequency of 430 MHz in strong inversion mode with the use of a 0.35 μm CMOS technology. It offers a gain bandwidth product of around 69MHz and a DC gain of 92 dB when operated in moderate inversion mode. A DC gain of 75.5 dB and a unity-gain frequency are parameters of the OTA circuit. Using the Sigma Delta analog-to-digital converter design for broad band radio applications, our goal was to create a folded cascode OTA circuit. Following is the structure of this document. Chapter II examines the OTA structure of a folded cascode. The three operational areas' OTA circuit architecture is shown in Section III. The design window is given in Section IV. After assessing our research in relation to previous publications, we finally provide some closing observations.