An area and power-efficient mixed-mode fully programmable FIR filter for biomedical interface microsystems

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 χ 31.5 saving in power χ area. Mathematical analysis and simulation results based on IBM 0.13μm CMOS technology models are presented.