Pre-load apparatus and method for travelling wave digitizer

摘要

A digitizer propagates coarse and fine wavelength electric fields across a platen to perform phase delay measurements, the results of which correspond to a displacement of a cursor along a measurement axis. The time interval between propagating the longer wavelength coarse electric field at a high velocity and subsequently establishing and propagating a shorter wavelength fine electric field at a low velocity is minimized by pre-loading at high speed a propagation circuit with the pattern to be propagated as the shorter wavelength fine electric field.