Two-stage class-AB OTA with improved specifications

This paper proposes a 95 dB DC-gain operational trans-conductance amplifier (OTA) with improved specifications. The trans-conductance of the first stage is increased by simultaneously using active loads and recycling folded cascode structure. Therefore, the DC-gain of the OTA is enhanced. Using the...

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Bibliographic Details
Published in:	Analog integrated circuits and signal processing Vol. 111; no. 2; pp. 159 - 168
Main Authors:	Ghorbanzadeh, Shahrbanoo, Dehbovid, Hadi, Ghorbani, Alireza, Abedi Pahnekola, Mehdi
Format:	Journal Article
Language:	English
Published:	New York Springer US 01-05-2022 Springer Nature B.V
Subjects:	Amplification Circuits and Systems Current mirrors Electrical Engineering Engineering Signal,Image and Speech Processing Slew rate Specifications OTA specifications Unity-gain bandwidth Operational trans-conductance amplifier Figures of merits
Online Access:	Get full text
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Summary:	This paper proposes a 95 dB DC-gain operational trans-conductance amplifier (OTA) with improved specifications. The trans-conductance of the first stage is increased by simultaneously using active loads and recycling folded cascode structure. Therefore, the DC-gain of the OTA is enhanced. Using the nonlinear current mirror in the second stage the current of the output stage is increased. Therefore, the slew rate is improved. The class-AB operation is achieved without unity-gain bandwidth (UGBW) or noise deterioration. The efficiency of the proposed OTA is evaluated by several simulations in a 0.18 μm CMOS process with the 1.8 V supply voltage. This technique is very helpful for high amplification, stability, and low power applications. Simulations results show that DC gain and (UGBW) are increased.
ISSN:	0925-1030 1573-1979
DOI:	10.1007/s10470-022-01986-4