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A low-voltage fully differential current-mode continuous time delta-sigma modulator is presented for application in electrochemical sensor arrays. Although a first order topology is realized by using a single differential integrator, second order noise shaping is achieved. A differential quantizer based on current controlled oscillators (CCOs) allows a current-mode implementation with high noise-immunity...
A current-mode delta-sigma modulator is presented for electrochemical sensor arrays utilizing a Current Conveyor and a Current Controlled Oscillator (CCO). Second order noise shaping is achieved although a very simple topology is used with only one integrator. The impact of oscillator non-linearity is kept low thanks to a pseudo-differential design. Simulations predict an SNDR of 102 dB at 10 kHz...
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...
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