EMI reduction of oscillating signals by way of controlled randomized modulation

摘要

An electrical circuit generates an oscillating signal that produces reduced electromagnetic interference by way of modulation of the frequency of the oscillating signal within a specified frequency range. A randomized signal generator creates a randomized signal, which is then used to drive a frequency range converter that is employed to produce a frequency modulation signal. The current state of the frequency modulation signal is based on the current state of the randomized signal, with the converter limiting the current state of the frequency modulation signal so that the oscillating signal will only operate within the specified frequency range. A variable frequency oscillator then generates the oscillating signal whose frequency is based on the current state of the frequency modulation signal.