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Title: Design of an auto-zeroed, differential, organic thin-film field-effect transistor amplifier for sensor applications
Authors: Binkley, David M.
Verma, Nikhil
Crawford, Robert L.
Brandon, Erik
Jackson, Thomas N.
Keywords: thin film transistors
Organic thin-film field-effect (OTFT) amplifiers
large-area electronics
organic sensors
dc offset cancellation
auto-zero circuits
differential amplifiers
analog circuits
switched-capacitor circuits
Issue Date: 3-Aug-2004
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004.
Citation: SPIE 49th International Symposium on Optical Science and Technology Annual Meeting, Denver, Colorado, August 2-6, 2004.
Abstract: Organic strain gauge and other sensors require high-gain, precision dc amplification to process their low-level output signals. Ideally, amplifiers would be fabricated using organic thin-film field-effect transistors (OTFT's) adjacent to the sensors. However, OTFT amplifiers exhibit low gain and high input-referred dc offsets that must be effectively managed. This paper presents a four-stage, cascaded differential OTFT amplifier utilizing switched capacitor auto-zeroing. Each stage provides a nominal voltage gain of four through a differential pair driving low-impedance active loads, which provide common-mode output voltage control. p-type pentacence OTFT's are used for the amplifier devices and auto-zero switches. Simulations indicate the amplifier provides a nominal voltage gain of 280 V/V and effectively amplifies a 1-mV dc signal in the presence of 500-mV amplifier input-referred dc offset voltages. Future work could include the addition of digital gain calibration and offset correction of residual offsets associated with charge injection imbalance in the differential circuits.
Appears in Collections:JPL TRS 1992+

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