Abstract: A clock frequency diffusing device including a multiphase clock signal generator, a random number generator, signal selectors, and a clock signal generator. The multiphase clock signal generator receives an input clock signal and produces a plurality of delayed clock signals that are delayed relative to the input clock signal by various amounts of time. The clock signal selector randomly chooses one of the delayed signals based upon random numbers generated by the random number generator and produces a selector output signal based on its chosen delayed clock signal. A clock signal generator receives the selector output signal and produces an output clock signal.