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Publication Detail
A 92dB 560MHz 1.5V 0.35μm CMOS operational transconductance amplifier
  • Publication Type:
    Conference
  • Authors:
    Adeniran O, Demosthenous A
  • Publisher:
    IEEE Computer Society
  • Publication date:
    2005
  • Place of publication:
    Piscataway, US
  • Pagination:
    325, 328
  • Published proceedings:
    Proceedings of the 2005 European Conference on Circuit Theory and Design
  • Volume:
    3
  • Editors:
    O'Regan F,Wegener C
  • ISBN-10:
    0780390660
  • Status:
    Published
  • Language:
    English
  • Notes:
    Conference took place between 28 August-2 September 2005 in Cork, Ireland
Abstract
This paper describes the design of a fully-differential, 1.5 V CMOS operational transconductance amplifier (OTA) for use in a pipeline analog-to-digital converter (ADC). Post-layout simulations for a 2 pF load capacitance show that the OTA achieves a gain-bandwidth of 560 MHz at a phase margin of 62°, with 92 dB dc gain. The OTA settles to an accuracy of -69 dB in 20 ns (closed loop-gain of 4), thus facilitating its use in the implementation of the multiplying digital-to-analog (MDAC) stages of a 1.5 V, 25 MS/s 10-bit pipeline ADC. Input-referred noise is about 8 nV/√Hz, power consumption is 3.9 mW and input range is 1 V peak-to-peak differential. A standard 0.35 μm CMOS process was used for the design.
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