High-Speed DSP Systems Design Reference Guide
by Texas Instruments
Today’s digital signal processors (DSPs) are typically run at a 1GHz internal clock rate while transmit and receive signals to and from external devices operate at rates higher than 200MHz. These fast switching signals generate a considerable amount of noise and radiation, which degrades system performance and creates electromagnetic interference (EMI) problems that make it difficult to pass tests required to obtain certification from the Federal Communication Commission (FCC). Good high-speed system design requires robust power sources with low switching noise under dynamic loading conditions, minimum crosstalk between high-speed signal traces, high- and low-frequency decoupling techniques, and good signal integrity with minimum transmission line effects. This document provides recommendations for meeting the many challenges of high-speed DSP system design.