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A Complementary Recycling Operational Transconductance Amplifier with Data-Driven Enhancement of Transconductance

Department of Precision Instruments, Tsinghua University, Beijing 100084, China
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This paper is an extended version of our previous conference paper: Li, X.; Wei, Q.; Zhou, B.; Chen, Z.; Zhang, R. Data-driven complementary recycling folded cascode OTA. In Proceedings of the International Conference on Mechanical, Electric and Industrial Engineering (MEIE), Hangzhou, China, 26–28 May 2018.
Electronics 2019, 8(12), 1457; https://doi.org/10.3390/electronics8121457
Received: 23 October 2019 / Revised: 25 November 2019 / Accepted: 28 November 2019 / Published: 1 December 2019
(This article belongs to the Section Microelectronics and Optoelectronics)
An improved operational transconductance amplifier (OTA) is presented in this work. The fully differential OTA adopts the current recycling technique and complementary NMOS and PMOS input branches to enhance the total transconductance. Moreover, in order to achieve higher current efficiency, a data-driven biasing circuit was developed to dynamically adjust the power consumption of the amplifier. Two comparators were added to detect the voltage difference at the input nodes, and when the differential input is large enough to activate either comparator, extra biasing current is activated and poured into the amplifier to enhance its slew rate and gain-bandwidth product (GBW). The threshold voltage of the complementary recycling folded cascode (CRFC)-based comparator is configured to suppress overshoot. Complementary common-mode feedback (CMFB) topology with local CMFB structure is built to acquire high common-mode gain. The OTA was fabricated in SMIC 0.18- μ m CMOS technology. The experimental result based on a capacitive feedback loop shows that the data-driven operation improves the average slew rate of the amplifier from 10.2 V/ μ s to 55.5 V/ μ s while the power only increases by 150%. The OTA has good potential to satisfy the fast settling demands for capacitive sensing circuits. View Full-Text
Keywords: complementary recycling folded cascode (CRFC); switched capacitor circuit; OTA; data-driven complementary recycling folded cascode (CRFC); switched capacitor circuit; OTA; data-driven
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MDPI and ACS Style

Li, X.; Hou, B.; Ju, C.; Wei, Q.; Zhou, B.; Zhang, R. A Complementary Recycling Operational Transconductance Amplifier with Data-Driven Enhancement of Transconductance. Electronics 2019, 8, 1457.

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