AREA EFFICIENT FIR FILTER WITH PROGRAMMABLE COEFFICIENTS

摘要

The present invention is directed to an FIR filter for filtering sample values, which may include an adder circuit storing a plurality of coefficient values to be used in the FIR filter and for combining the samples values and the coefficient value to produce a combination value; and a memory circuit connected to the adder circuit for storing the combination value and for inputting at least a portion of the combination value back into the adder circuit to be combined with the sample values and the coefficient value. The present invention may also include a coefficient input circuit for inputting and storing a plurality of coefficient values to be used in the FIR filter; an ADC converter input circuit for inputting the sample values from the ADC converter; and an output circuit for outputting at least a portion of said combination value from the FIR filter. In the FIR filter of the present invention the coefficient values may be the same or different.