Optimally Factored Interpolated FIR Filter Design

摘要

A method and system for the design and implementation of an optimally factored interpolated finite impulse response (IFIR) filter is presented. Techniques used to increase the implementation efficiency of the filter include joint sequencing of the filter stages, use of an nested IFIR filter, taming of a stage by relocation of that stage, fusing two or more stages together to form a single stage, and manual manipulation of a post-stage multiplier. IFIR filters using this approach may be realized as low pass filters or high pass filters, and in either analog or digital form.

主权项

1. A filter, implemented in hardware, configured to receive an input signal and generate an output signal, the filter comprising:
a first IFIR sub-filter having a first plurality of stages, wherein each stage of the first plurality of stages has an order of four or greater, and a second IFIR sub-filter having a second plurality of stages, wherein each stage of the second plurality of stages has an order of less than four; and wherein a total order of the first plurality of stages is higher than a total order of the second plurality of stages.