Simple Scheme for the Implementation of Low Voltage Fully Differential Amplifiers without Output Common-Mode Feedback Network

Simple Scheme for the Implementation of Low Voltage Fully Differential Amplifiers without Output Common-Mode Feedback Network

A simple scheme to implement class AB low-voltage fully differential amplifiers that do not require an output common-mode feedback network (CMFN) is introduced. It has a rail to rail output signal swing and high rejection of common-mode input signals. It operates in strong inversion with ±300 mV sup...

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Bibliographic Details
Main Authors: Mario Renteria-Pinon, Jaime Ramirez-Angulo, Alejandro Diaz-Sanchez
Format: Article
Language:English
Published: MDPI AG 2020-10-01
Series:Journal of Low Power Electronics and Applications
Subjects:
low voltage amplifiers
class AB operational amplifiers
analog integrated circuits
Online Access:https://www.mdpi.com/2079-9268/10/4/34
id doaj-a78a6d883d964f218c09c1873f57438f
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spelling doaj-a78a6d883d964f218c09c1873f57438f2020-11-25T03:37:46ZengMDPI AGJournal of Low Power Electronics and Applications2079-92682020-10-0110343410.3390/jlpea10040034Simple Scheme for the Implementation of Low Voltage Fully Differential Amplifiers without Output Common-Mode Feedback NetworkMario Renteria-Pinon0Jaime Ramirez-Angulo1Alejandro Diaz-Sanchez2Klipsch School of Electrical and Computer Engineering, New Mexico State University, Las Cruces, NM 88003, USAKlipsch School of Electrical and Computer Engineering, New Mexico State University, Las Cruces, NM 88003, USADepartment of Electronics, INAOE, Puebla 72840, MexicoA simple scheme to implement class AB low-voltage fully differential amplifiers that do not require an output common-mode feedback network (CMFN) is introduced. It has a rail to rail output signal swing and high rejection of common-mode input signals. It operates in strong inversion with ±300 mV supplies in a 180 nm CMOS process. It uses an auxiliary amplifier that minimizes supply requirements by setting the op-amp input terminals very close to one of the rails and also serves as a common-mode feedback network to generate complementary output signals. The scheme is verified with simulation results of an amplifier that consumes 25 µW, has a gain-bandwidth product (GBW) of 16.1 MHz, slew rate (SR) of 8.4 V/µs, the small signal figure of merit (FOM<sub>SS</sub>) of 6.49 MHz*pF/µW, the large signal figure of merit (FOM<sub>LS</sub>) of 3.39 V/µs*pF/µW, and current efficiency (CE) of 2.03 in strong inversion, with a 10 pF load capacitance.https://www.mdpi.com/2079-9268/10/4/34low voltage amplifiersclass AB operational amplifiersanalog integrated circuits
collection DOAJ
language English
format Article
sources DOAJ
author Mario Renteria-Pinon
Jaime Ramirez-Angulo
Alejandro Diaz-Sanchez
spellingShingle Mario Renteria-Pinon
Jaime Ramirez-Angulo
Alejandro Diaz-Sanchez
Simple Scheme for the Implementation of Low Voltage Fully Differential Amplifiers without Output Common-Mode Feedback Network
Journal of Low Power Electronics and Applications
low voltage amplifiers
class AB operational amplifiers
analog integrated circuits
author_facet Mario Renteria-Pinon
Jaime Ramirez-Angulo
Alejandro Diaz-Sanchez
author_sort Mario Renteria-Pinon
title Simple Scheme for the Implementation of Low Voltage Fully Differential Amplifiers without Output Common-Mode Feedback Network
title_short Simple Scheme for the Implementation of Low Voltage Fully Differential Amplifiers without Output Common-Mode Feedback Network
title_full Simple Scheme for the Implementation of Low Voltage Fully Differential Amplifiers without Output Common-Mode Feedback Network
title_fullStr Simple Scheme for the Implementation of Low Voltage Fully Differential Amplifiers without Output Common-Mode Feedback Network
title_full_unstemmed Simple Scheme for the Implementation of Low Voltage Fully Differential Amplifiers without Output Common-Mode Feedback Network
title_sort simple scheme for the implementation of low voltage fully differential amplifiers without output common-mode feedback network
publisher MDPI AG
series Journal of Low Power Electronics and Applications
issn 2079-9268
publishDate 2020-10-01
description A simple scheme to implement class AB low-voltage fully differential amplifiers that do not require an output common-mode feedback network (CMFN) is introduced. It has a rail to rail output signal swing and high rejection of common-mode input signals. It operates in strong inversion with ±300 mV supplies in a 180 nm CMOS process. It uses an auxiliary amplifier that minimizes supply requirements by setting the op-amp input terminals very close to one of the rails and also serves as a common-mode feedback network to generate complementary output signals. The scheme is verified with simulation results of an amplifier that consumes 25 µW, has a gain-bandwidth product (GBW) of 16.1 MHz, slew rate (SR) of 8.4 V/µs, the small signal figure of merit (FOM<sub>SS</sub>) of 6.49 MHz*pF/µW, the large signal figure of merit (FOM<sub>LS</sub>) of 3.39 V/µs*pF/µW, and current efficiency (CE) of 2.03 in strong inversion, with a 10 pF load capacitance.
topic low voltage amplifiers
class AB operational amplifiers
analog integrated circuits
url https://www.mdpi.com/2079-9268/10/4/34
work_keys_str_mv AT mariorenteriapinon simpleschemefortheimplementationoflowvoltagefullydifferentialamplifierswithoutoutputcommonmodefeedbacknetwork
AT jaimeramirezangulo simpleschemefortheimplementationoflowvoltagefullydifferentialamplifierswithoutoutputcommonmodefeedbacknetwork
AT alejandrodiazsanchez simpleschemefortheimplementationoflowvoltagefullydifferentialamplifierswithoutoutputcommonmodefeedbacknetwork
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