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Variable-rate data sampling for low-power microsystems using modified Adams methods

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4 Author(s)
Irvine, G.B. ; Dept. of Electron. & Electr. Eng., Glasgow Univ., UK ; Lei Wang ; Dickman, P. ; Cumming, D.R.S.

A method for variable-rate data sampling is proposed for the purpose of low-power data acquisition in a small footprint microsystem. The procedure enables energy saving by utilizing dynamic power management techniques and is based on the Adams-Bashforth and Adams-Moulton multistep predictor-corrector methods for ordinary differential equations. Newton-Gregory backward difference interpolation formulae and past value substitution are used to facilitate sample rate changes. It is necessary to store only 2m+1 equispaced past values of t and the corresponding values of y, where y=g(t), and m is the number of steps in the Adams methods. For the purposes of demonstrating the technique, fourth-order methods are used, but it is possible to use higher orders to improve accuracy if required.

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Signal Processing, IEEE Transactions on  (Volume:51 ,  Issue: 12 )