FLAT SPIRAL DELAY-LINE DESIGN WITH MINIMUM CROSSTALK PENALTY

A novel routing scheme for the planar delay line is proposed to minimi ze the signal distortion and delay time penalty incurred by the backwa rd propagating crosstalk among the sections of delay line, In contrast to the commonly employed serpentine delay line in which the crosstalk noise accumulates synchronously to drastically deteriorate the receiv ing waveform, the new flat spiral delay line design spreads the crosst alk noise uniformly in time and avoids the crosstalk penalty. A simple wave tracing model is employed to describe qualitatively the spreadin g mechanism of the new design, Furthermore, quantitative analysis, sim ulation, and TDT/TDR measurement are performed to validate the advanta ge and utility of this design.