SPREAD FREQUENCY SPECTRUM WAVEFORM GENERATING CIRCUIT

摘要

A circuit for generating a spread frequency spectrum waveform with shaped frequency spectrum distribution. A waveform generator has a spread spectrum waveform generating circuit (1) that generates a waveform with a spread spectrum and a frequency spectrum distribution shaping circuit (2) that shapes the frequency spectrum distribution of the spread spectrum waveform. In one embodiment, distribution shaping circuit (2) shapes the spread spectrum waveform to give a frequency spectrum distribution having a reduced spectrum part in at least one band. Also, in one embodiment, the frequency of the spread spectrum waveform can vary periodically or non periodically.