Design and Analysis of Two Stage Fully Differential Telescopic Operational Amplifier and Two Stage Fully Differential Folded Cascode Operational Amplifier
This paper presents a design methodology of a two stage fully differential telescopic operational amplifier. Similar analysis is carried out for the two stage folded cascode operational amplifier and results are compared at 180 nm technology node. Here effort is made to make the unity gain frequency and the slew rate same of both the respective two stage amplifiers. The purpose of such an effort is to carry out a comparison of various parameters viz. voltage gain, phase margin, common mode rejection ratio (CMRR), power supply rejection ratio (PSRR), output swing and power consumption. It has been observed that the two stage telescopic amplifier gives better results in terms of voltage gain, CMRR, PSRR as compared to folded cascade counter-part. Whereas the folded cascode two stage gives better results in terms of bandwidth and output swing limit. Furthermore, it is also seen that the two stage telescopic amplifier is more suitable for low power applications. Keywords: Operational Amplifier, Telescopic, Folded Cascode, Output SwingCite this Article Soumen Chatterjee, Mayank Kumar Rai, Design and Analysis of Two Stage Fully Differential Telescopic Operational Amplifier and Two Stage Fully Differential Folded Cascode Operational Amplifier, Recent Trends in Electronic and Communication System, 2015; 2(2): 7–19p.
