System for varying the dynamic range of coefficients in a digital filter

摘要

A digital filter includes a plurality of filter cells, each of which includes circuitry to determine a coefficient for the filter cell, to adjust the coefficient in accordance with a gain that is used by each of the plurality of filter cells, and to multiply input data by the adjusted coefficient in order to generate a filter cell output. An adder circuit generates a filter output by adding filter cell outputs from each of the plurality of filter cells, and an inverse gain circuit adjusts the filter output in accordance with an inverse of the gain used to adjust the coefficients of the plurality of filter cells.