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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.|
Crawford, Robert L.
Jackson, Thomas N.
|Keywords: ||thin film transistors|
Organic thin-film field-effect (OTFT) amplifiers
dc offset cancellation
|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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