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An Integrated CMOS Front-End for Optical Absolute Rotary Encoders

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Abstract

This paper presents a front-end circuit for optical rotary encoders. The light pulses modulated by the encoder disc are transduced into current signals, which are pre-processed and converted into digital waveforms related to the disc angular position information. The proposed front-end circuit is compensated against temperature drifts. Digitally programmable calibration is provided to account for spreads in impinging light pulse power. Measurement results on integrated prototypes are shown, demonstrating correct operation of the front-end with an optical input power from 0.5 μW to 3 μW up to a signal frequency of 500 kHz in a temperature range from 0 °C to 80 °C.

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Authors and Affiliations

  1. Centro per la Ricerca Scientifica e Tecnologica, Istituto Trentino di Cultura, Via Sommarive 18, 38055, Povo (TN), Italy

    Massimo Gottardi, Lorenzo Gonzo & Andrea Simoni

  2. Dipartimento di Elettronica, Università di Pavia, Via Ferrata 1, 27100, Pavia, Italy

    Stefano Gregori & Guido Torelli

  3. Dipartimento di Tecnologie dell'Informazione, Università di Milano, Via Bramante 65, 26013, Crema (CR), Italy

    Valentino Liberali

Authors
  1. Massimo Gottardi
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  2. Lorenzo Gonzo
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  3. Stefano Gregori
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  4. Valentino Liberali
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  5. Andrea Simoni
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  6. Guido Torelli
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Gottardi, M., Gonzo, L., Gregori, S. et al. An Integrated CMOS Front-End for Optical Absolute Rotary Encoders. Analog Integrated Circuits and Signal Processing 34, 143–154 (2003). https://doi.org/10.1023/A:1021989119819

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  • DOI: https://doi.org/10.1023/A:1021989119819

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