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This paper introduces the design of a power-area-efficient impedance sensor for a microelectrode array (MEA). The proposed architecture uses the quadrature phase integration method to estimate the magnitude and phase of the impedance-related current signal. By implementing a 12-bit 2-stage quantizer, a wide dynamic sensing range from 1 Hz to 100 kHz can be achieved. The sensor is designed in a 0.18...
Incremental analog to digital converters (lADCs) are aimed at converting low frequency signals with high accuracy. However the use of high oversampling ratios (OSR) usually decreases the conversion speed making them energy inefficient. The first integrator also consumes a lot of power due to high settling requirements, if a single bit quantizer is used. This paper introduces a two step feedforward...
Wideband (10 MHz) continuous-time (CT) sigma-delta modulators generally use active-RC filters. On the other hand, Gm-C-filters avoid the need of a power-hungry driving stage due to their small loading. At the moment, the major challenge for designing Gm-C-based modulator is the narrow linear input range due to the nonlinear Gm amplifier, which leads to low SNDR. This...
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