POLYPHASE TECHNIQUES ALLOW YOU TO CREATE LARGE FILTERS IN SMALLER IMPLEMENTATIONS IN MIDRANGE FPGAs: POLYPHASE FILTERS REDUCE SATURATION

摘要

Digital signal processing is ubiquitous in modern electronic systems, from MP3 players to digital cameras to wireless handsets. One of the mainstays of a DSP designer's tool box is the FIR (finite-impulse-response) filter. The longer the FIR filter-that is, the greater the number of taps-the better the filter's response. This situation involves a trade-off, however, because more taps require increased logic requirements, increased computational complexity, increased power consumption, and a greater potential for saturation or overflow.