Integrated control circuit for adaptive sampling

Authors:
Robert Rieger;Shu-Han Nian
Affiliations:
Electrical Engineering Department, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424;Electrical Engineering Department, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2012

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Abstract

A fully integrated controller for non-uniform data sampling suitable for the pre-processing of signals in a power- and size-restricted sensor front-end is presented. The sample rate is dynamically varied based on signal activity determined by the 2nd derivative of the input voltage. The derivative is realized with high-pass filters having 647 Hz cut-off frequency. A digital circuit generates the time-stamps and the trigger for an external analog-to-digital converter. Measured results of a 0.35 μm CMOS implementation show a sample rate variation of 7:1 and a system power advantage compared to conventional front-ends. The circuit dissipates 48 μW from 卤1.5 V supplies and consumes an active area of 0.068 mm2.