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A Fully Integrated \Delta \Sigma ADC in Organic Thin-Film Transistor Technology on Flexible Plastic Foil

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4 Author(s)
Hagen Marien ; Department of Electrical Engineering, Katholieke Universiteit Leuven, Heverlee, Belgium ; Michiel S. J. Steyaert ; Erik van Veenendaal ; Paul Heremans

In this work we present a fully integrated first order continuous-time ΔΣ ADC made in a pentacene-based dual-gate organic thin-film transistor technology on flexible plastic foil. The ADC achieves a precision of 26.5 dB at a clock speed of 500 Hz and draws 100 μA from a 15 V power supply. As sub-blocks of the ADC, we also present a Vt -insensitive single-stage differential amplifier with 10 kHz GBW, a 3-stage operational amplifier, an integrator, a comparator and a level shifter. The circuits are designed following a strict Vt -insensitive design strategy and use high-pass filters for offset cancellation. The active area is 13 × 20 mm2.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:46 ,  Issue: 1 )