Pseudo-Random Clocking to Enhance Signal Integrity

Abstract — A methodology is proposed to reduce power/ground and substrate coupling noise by randomizing the clock signal. A pseudo-random number generation algorithm is used to produce a pseudo-random clock. A probability adjustment technique is introduced to compensate for the speed loss, permitting the average frequency of the pseudo-random clock to be determined. The proposed method achieves more than 24 dB attenuation in noise at the center frequency at a cost of less than 4 % reduction in speed. I