18 October 2004 Design of an auto-zeroed differential organic thin film field-effect transistor amplifier for sensor applications
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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 pentacene 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.
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David M. Binkley, David M. Binkley, Nikhil Verma, Nikhil Verma, Robert L. Crawford, Robert L. Crawford, Erik J. Brandon, Erik J. Brandon, Thomas N. Jackson, Thomas N. Jackson, } "Design of an auto-zeroed differential organic thin film field-effect transistor amplifier for sensor applications", Proc. SPIE 5522, Organic Field-Effect Transistors III, (18 October 2004); doi: 10.1117/12.559934; https://doi.org/10.1117/12.559934
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