Patent ID: 6169889
Filing Date: 2001-01-02
Classification: H04B

Abstract:
An electronic device having reduced radio frequency interference (RFI) emissions, comprising: a signal generator coupled to a reference clock signal, that generates a random signal derived from the reference clock signal; a first digital circuit coupled to the signal generator; and a radio receiver that receives the RFI that is emitted by the first digital circuit, wherein the signal generator generates a spread spectrum clock signal based on the random signal, and wherein the electronic device further comprises a clock multiplexer coupled to the reference clock signal, the spread spectrum clock signal and the first digital circuit, and wherein the first digital circuit is clocked by one of the reference clock signal and spread spectrum clock signal as selected by the clock multiplexer, and wherein when the radio receiver is in a deactivated state, the clock multiplexer selects the reference clock signal, and wherein when the radio receiver is in an activated state, the clock multiplexer selects the spread spectrum clock signal.