Patent ID: 7805123

Claim:
A frequency hopping communication IC comprising: a direct digital synthesizer for outputting first quadrature phase signals of 0 degree, 90 degrees, 180 degrees, and 270 degrees, whose phases differ from each other at least by 90 degrees, at a frequency based on a frequency setting parameter in synchronization with a reference clock; a fixed frequency oscillator for outputting second quadrature phase signals of 0 degree, 90 degrees, 180 degrees, and 270 degrees, whose phases differ from each other by 90 degrees; and a single side band mixer having an RF input to which the first quadrature phase signals are inputted and a local oscillation signal input terminal to which the second quadrature phase signals are inputted, for outputting either one of a sum component frequency or a difference component frequency to an output terminal; wherein an operation of switching an output frequency of the single side band mixer is performed by an operation of switching an output frequency of the direct digital synthesizer.