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Optimum Split Ratio for Folded Cascode OTA Bias Current: A Qualitative and Quantitative Study | IEEE Conference Publication | IEEE Xplore

Optimum Split Ratio for Folded Cascode OTA Bias Current: A Qualitative and Quantitative Study


Abstract:

This paper presents a systematic study on the effect of varying the bias current split ratio (S) in the ubiquitous folded cascode amplifier. A unity gain capacitive feedb...Show More

Abstract:

This paper presents a systematic study on the effect of varying the bias current split ratio (S) in the ubiquitous folded cascode amplifier. A unity gain capacitive feedback amplifier is used as a design example to show the effect of S on the amplifier parameters such as loop gain, closed-loop bandwidth, phase margin, and thermal noise. Moreover, the effect of S on the slew rate and the overall settling time of the amplifier is investigated. Analytical equations are derived and verified by simulation results using 180nm CMOS technology. Results show that the common practice of splitting the current equally does not yield optimum results even in the case of slewing. The optimum choice of S can result in 3dB increase in DC gain, 40% increase in bandwidth, 33% reduction in noise density, and 56% improvement in settling time.
Date of Conference: 15-18 December 2019
Date Added to IEEE Xplore: 05 March 2020
ISBN Information:
Conference Location: Cairo, Egypt

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