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Title of Journal: Analog Integr Circ Sig Process

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Abbravation: Analog Integrated Circuits and Signal Processing

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Springer US

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DOI

10.1007/s10879-008-9109-x

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1573-1979

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Automatic tuning of digitallycontrollable positiv

Authors: Astria Nur Irfansyah Andrew Peter Nicholson Artemij Iberzanov Julian Jenkins Torsten Lehmann Tara Julia Hamilton
Publish Date: 2016/07/30
Volume: 89, Issue: 2, Pages: 469-483
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Abstract

This paper proposes a technique suitable for onchip tuning of digitallytunable positivefeedback operational transconductor amplifiers in a continuoustime sigma–delta modulator CTSDM with activeRC integrator stages The work we present relies on phase shift and offset measurement of individual activeRC integrator stages output using comparators to estimate output conductance DCgain and common mode level of the differential output signals The tuning methodology aims to tune the integrator stages to achieve sufficient DCgain as required by the SDM We present experimental results to confirm the correlation of our integrator phase and output offset detection technique with the operational transconductance amplifier OTA DC gain We employ this technique in a tuning process of two digitallytunable OTA chips implemented in complementary metaloxide semiconductor 180 nm process configured in a secondorder CTSDM circuit with discrete components The tuning algorithm results in a measured signaltonoise and distortion ratio SNDR of 4697 dB which is close to the maximum SNDR of 4783 dB achievable across a subset of the digitallytunable OTA code space Highspeed operation of the CTSDM and tuning circuitry has been verified through circuit simulationsThis work was supported by the Australian Research Council ARC Linkage Grant LP100200275 and Perceptia Devices Australia Pty Ltd The PhD Program for the first author has been supported by the Indonesian Government Directorate of Higher Education scholarship

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