Transient analysis with S-parameter for coupler designing

摘要

This paper describes a method to optimize the frequency property of a directional coupler in a high-speed memory bus. The method has two steps: a transient analysis modeling of the coupler described as S-parameters, and a maximizing the tolerance of a coupling waveform by cutting the bandwidth of the coupler. The SPICE simulations show that the bandwidth of the coupler optimized is enough to 2.3 times the -3dB frequency, which is the half-power point of the input pulse to the coupler.