CCO-based continuous-time ΔΣ modulators for electrochemical sensor arrays: System- and transistor-level simulation results.
MIXDES（2014）
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.
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Key words
current-mode circuits,delta-sigma modulation,electrochemical electrodes,electrochemical sensors,electrolytes,radiofrequency oscillators,relaxation oscillators,sensor arrays,voltammetry (chemical analysis),1st order current-mode continuous-time delta-sigma modulator architecture,CCO-based continuous-time ΔΣ modulator,SNDR,bandwidth 10 kHz,current-controlled oscillator-based quantizer,cyclic voltammetry,electrochemical sensor array,electrode-to-electrolyte interface,in-sensor-site readout presentation,integration capacitance,noise figure 62 dB,noise figure 67 dB,relaxation oscillator,supply voltage variation,CCO-based quantizer,Cyclic Voltammetry,Delta Sigma modulator,electrochemical detection,relaxation oscillator,
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