A VCO-based current-to-digital converter for sensor applications

Praveen Prabha,Seong Joong Kim,Karthikeyan Reddy,Sachin Rao,Nathanael Griesert,Arun Rao,Greg Winter,Pavan Kumar Hanumolu

CICC（2014）

引用 8|浏览73

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摘要

A current sensing VCO based ADC architecture is realized using a passive integrator, VCO-based quantizer, and mostly digital circuits. A digital IIR filter is used instead of an analog loop filter to tackle VCO non-linearity in a power efficient and scaling friendly manner. The prototype circuit designed for an ambient light sensor application achieves 900pA accuracy over an input current range of 4μA, consumes a total of 77.8μA current, and occupies an active area of 0.36mm2 in 0.18μm CMOS process.

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关键词

current 900 pa,cmos process,current measurement,cmos integrated circuits,analogue-digital conversion,voltage-controlled oscillators,adc architecture,electric current measurement,current 4 mua,analog-digital conversion,digital circuits,current sensing vco,sensor applications,digital iir filter,delta-sigma modulation,electric sensing devices,size 0.18 mum,analog loop filter,current 77.8 mua,light sensor,vco-based quantizer,optical sensors,passive integrator,current-to-digital converter,iir filters,photodiodes,sensor systems and applications,size 0.36 mm,vco non-linearity

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