Patent ID: 7720170

Claim:
An integrated circuit system for reducing an electromagnetic radiation from a circuit board comprising: a transmitter for accepting an input signal and converting said input signal to an output signal that has a lower electromagnetic emission than said input signal, said transmitter comprises: a frequency divider for dividing said input signal by a number therefore generating an intermediate signal with lower frequency; wherein said number can be fixed or programmable; wherein said intermediate signal has pulses and each pulse has a leading edge and a trailing edge; a pulse shaper for generating the output signal having a first pulse at said leading edge of said intermediate signal and a second pulse at said trailing edge of said intermediate signal, said pulse shaper comprises: a first integrator for integrating the intermediate signal and output a first integrated signal; a first logic accepts the first integrated signal and the intermediate signal to generate a first logic signal; a second integrator for integrating the intermediate signal and output a second integrated signal; a second logic accepts the second integrated signal and the intermediate signal to generate a second logic signal; a third logic accepts the first and second logic signal to generate the output signal; wherein said first pulse has a first pulse duration and said second pulse has a second pulse duration; wherein said integrators are programmable to adjust said first pulse duration and said second pulse duration; wherein said integrators generate said output signal that has plurality of said first and said second pulses therefore spreading the energy in said output signal to reduce said electromagnetic emission; a receiver for receiving said output signal from said transmitter and generating a signal from said output signal which has substantially same frequency as said input signal.