A 0.4 ​V, body-driven, fully differential, tail-less OTA based on current push-pull. (May 2020)

• Record Type: Journal Article
• Authors: Faraji Baghtash, Hassan
• Is Part Of: Microelectronics journal. Volume 99(2020)
• Publication Date: 2020-05
• Subjects: Current push-pull amplifier -- OTA -- Low power -- Low voltage -- Rail to rail -- Tail-less; Microelectronics -- Periodicals; Microélectronique -- Périodiques; Microelectronics; Electronic journals; Journals - contents and abstracts; Periodicals; 621.3805
• DOI: 10.1016/j.mejo.2020.104768
• Languages: English
• ISSNs: 0959-8324

Abstract

Abstract: A tail-less, fully differential trans-conductance amplifier is presented in this paper. The proposed structure arranges the current push-pulls as the core amplifier blocks in an elaborate manner to achieve fully differential function with tail-less power optimized elements. The current push-pull structures reuse the bias current effectively to maximize the trans-conductance of block. The proposed OTA structure exploits this advantage to reduce the power consumption of proposed structure down to 0.3 ​μW. The Spectre Post-layout simulations with TSMC 180 ​nm CMOS technology file have been performed to validate the performance of the proposed amplifier. The proposed amplifier exhibits a DC gain of 81.37 ​dB and a phase margin of 59.2° at unity-gain frequency of 280.4 ​kHz for a 5 ​pF load capacitance. The proposed structure also delivers high CMRR and PSRR values of 126.2 ​dB and 79.1 ​dB, respectively. To investigate the performance of the design over process and temperature variations, the Monte Carlo and corner simulations are performed. The circuit biased with 0.4 ​V power supply.