ETRI Journal

Electronics and Telecommunications Research Institute (한국전자통신연구원)
권호 표지

Integrated Rail-to-Rail Low-Voltage Low-Power Enhanced DC-Gain Fully Differential Operational Transconductance Amplifier

  • Ferri, Giuseppe (Department of Information and Electronic Engineering, University of L'Aquila) ;
  • Stornelli, Vincenzo (Department of Information and Electronic Engineering, University of L'Aquila) ;
  • Celeste, Angelo (Department of Information and Electronic Engineering, University of L'Aquila)
  • Received : 2007.05.31
  • Published : 2007.12.31
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Abstract

In this paper, we present an integrated rail-to-rail fully differential operational transconductance amplifier (OTA) working at low-supply voltages (1.5 V) with reduced power consumption and showing high DC gain. An embedded adaptive biasing circuit makes it possible to obtain low stand-by power dissipation (lower than 0.17 mW in the rail-to-rail version), while the high DC gain (over 78 dB) is ensured by positive feedback. The circuit, fabricated in a standard CMOS integrated technology (AMS 0.35 ${\mu}m$), presents a 37 V/${\mu}s$ slew-rate for a capacitive load of 15 pF. Experimental results and high values of two quality factors, or figures of merit, show the validity of the proposed OTA, when compared with other OTA configurations.

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