Design Methodology for Common-Mode Stability of OTA-based Gyrators

This paper presents a design methodology for common-mode (CM) stability of operational transconductance ampliﬁer (OTA)-based gyrators. The topology of gm−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, that 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 CMOS technology and its CM stability is examined.

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Design Methodology for Common-Mode Stability of OTA-based Gyrators

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