High-speed frequency synthesizer for spread spectrum communication systems

Abstract

A high-speed direct digital frequency synthesizer has been designed for ultra-fast frequency-hopped spread spectrum applications. It is called the low-latency residue synthesizer (LLRS) and exhibits frequency switching times which are reduced by more than 50% below previously published designs. The switching speed advantage is made possible by the use of the residue number system and one-hot encoding of phase information. Pipeline lengths in the phase accumulator and other circuitry are thereby reduced significantly.<>