Bi-dimensional radially-salphasic (standing wave) clock distribution

摘要

Salphasic (literally phase saltation) distribution assumes the creation of a standing wave pattern in the clock distribution network in such a way as to present an amplitude anti-node to the driving circuit. A characteristic of standing wave patterns is the existence of extended constant-phase regions (of a length of half-wavelength), with abrupt changes of 180 degrees at the amplitude nodes. These same-phase regions allow for simple implementations of (very) large synchronous systems. For proper distribution on large (two-dimensional) integrated circuits, it is desirable to use generalized multi-dimensional salphasic geometries. This article presents a model based on process specific parameters for such a configuration used in a two-dimensional case. Furthermore, based on the theoretical formulation, novel structures are readily derived - the present article details a radial bi-dimensional waveguide in which, instead of the normally cylindrical waves, the propagation assumes a pseudo-uni-dimensional behavior - i.e. a plane wave. The net benefit is that the bi-dimensional structure reduces to the common transmission line model, even for arbitrary signals in non-standing wave use cases.