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CMOS-integrated capacitance based cell sensing has shown promising results for the monitoring cell volume growth. The process utilizes the direct correlation between cell health and measured capacitance. Prior sensors have used charge based capacitance measurement, which has limitations in offset correction, range and resolution. An alternative approach to monitoring small changes in the electrode...
This paper presents a ring oscillator based readoutcircuit for differential capacitive MEMS. Flicker noise isreduced by modulating it to frequencies above the bandwidthof interest and then filtering. A technique equivalent tochopping in conventional switched capacitor circuits isdeveloped and applied to a single ended ring oscillatorcontrolled by the MEMS capacitance. A prototype wasdesigned in a...
A new technique and circuit topology is proposed to readout the output of a capacitive sensor for lab on chip (LOC) applications. Using time-mode signal processing and adopting modified digital blocks, a first-order delta-sigma interface is developed. It offers an incredibly compact and low-power solution where analog precision is achieved by making advantage of digital design. The design is capable...
A new low-jitter polyphase-filter-based frequency multiplier incorporating a phase error calibration circuit to reduce the phase errors is presented. Designing with a multiplication ratio of eight, it has been fabricated in a 0.13-mum CMOS process. For input frequency of 25 MHz, the measured jitter is 2.46 ps (rms) and plusmn9.33 ps (pk-pk) at 200-MHz output frequency, while achievable maximum static...
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