Design methodology for common‐mode stability of OTA‐based gyrators. (22nd September 2015)

• Record Type: Journal Article
• Authors: Ghamari, Saeed; Tasselli, Gabriele; Botteron, Cyril; Farine, Pierre‐André
• Is Part Of: International journal of circuit theory and applications. Volume 44:Number 5(2016:May)
• Page Start: 1142
• Page End: 1155
• Publication Date: 2015-09-22
• Subjects: common‐mode stability -- gm − C filters -- gyrator -- operational transconductance amplifier (OTA) -- resonator; Electric circuit analysis -- Periodicals; 621.319205
• DOI: 10.1002/cta.2154
• Languages: English
• ISSNs: 0098-9886

Abstract

Summary: This paper presents a design methodology for common‐mode (CM) stability of operational transconductance amplifier (OTA)‐based gyrators. The topology of g m − C active inductors is briefly reviewed. Subsequently, a comprehensive mathematical analysis on the CM stability of OTA‐based gyrators is presented. Sufficient requirements for the gyrator's CM stability, which easily can be considered during the design process of common‐mode feedback (CMFB) amplifiers, are defined. Based on these stability requirements, a design methodology and a design procedure are proposed. Finally, in order to validate the proposed procedure, a resonator with 20 MHz resonance frequency and a quality factor of 20 is fabricated with UMC 180 nm complementary metal‐oxide‐semiconductor technology, and its CM stability is examined. Copyright © 2015 John Wiley & Sons, Ltd. Abstract : This paper presents a design methodology for common‐mode (CM) stability of operational transconductance amplifier (OTA)‐based gyrators. The topology of g m ‐ C active inductors is briefly reviewed. Subsequently, a comprehensive mathematical analysis on the CM stability of OTA‐based gyrators is presented. Sufficient requirements for the gyrator's CM stability, which easily can be considered during the design process of common‐mode feedback (CMFB) amplifiers, are defined. Based on these stability requirements, a design methodology and a design procedure are proposed. Finally, in order to validate the proposed procedure, a resonator with 20 MHz resonance frequency and a quality factor of 20 is fabricated with UMC 180 nm complementary metal‐oxide‐semiconductor technology, and its CM stability is examined.