An analogue discrete-time implementation of an adaptive infinite-impulse-response (IIR) filter is presented. The filter structure uses the IIR modelling capability of first- and second-orderfilter sections and the ad...
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An analogue discrete-time implementation of an adaptive infinite-impulse-response (IIR) filter is presented. The filter structure uses the IIR modelling capability of first- and second-orderfilter sections and the adaptation process is a variable step-size version of the least-mean-squared (LMS) algorithm. The gradient signals were chosen to allow the use of the whole dynamic range of the four-quadrant analogue multiplier. With respect to implementation problems, the effects of nonidealities on the building elements an investigated and reduced using appropriate circuit techniques. The functional behaviour of the proposed structure is demonstrated for a low-complexity third-order adaptive filter with a parallel architecture.
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