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CCO-based continuous-time ΔΣ modulators for electrochemical sensor arrays: System- and transistor-level simulation results | IEEE Conference Publication | IEEE Xplore

CCO-based continuous-time ΔΣ modulators for electrochemical sensor arrays: System- and transistor-level simulation results


Abstract:

A 1st order current-mode continuous-time delta-sigma modulator architecture is presented for in-sensor-site readout in electrochemical sensor arrays. The electrode-to-ele...Show More

Abstract:

A 1st order current-mode continuous-time delta-sigma modulator architecture is presented for in-sensor-site readout in electrochemical sensor arrays. The electrode-to-electrolyte interface is used as integration capacitance, followed by a Current-Controlled Oscillator-based quantizer. A relaxation oscillator is optimized to meet the requirements of Cyclic Voltammetry. Two circuit realizations are presented and investigated by means of simulation. Both modulators achieve 30 dB/decade noise shaping and reach an SNDR of 67 dB and 62 dB, respectively, at a signal bandwidth of 10 kHz. The reported modulators are highly efficient regarding area and power, and immune to noise and supply voltage variations.
Date of Conference: 19-21 June 2014
Date Added to IEEE Xplore: 07 August 2014
ISBN Information:
Conference Location: Lublin, Poland

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