A mixed-mode analog-digital transposed 64-tap finite impulse response filter for multi-channel biomedical monitoring systems is presented. The presented architecture conducts multiplication in analog domain by taking advantage of a compact preceding multiplying-ΔΣ ADC, which is implemented by reusing the in-channel current-mode stimulating DAC. The analog domain multiplication results in a ×16.4 saving in silicon area, and is combined with a resource-sharing scheme to yields an overall ×31.5 saving in power×area. Mathematical analysis and simulation results based on IBM 0.13μm CMOS technology models are presented.
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