The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 1991
Filed:
Dec. 13, 1990
Michael Cooperman, Framingham, MA (US);
Richard W Sieber, Attleboro, MA (US);
Arnold Paige, Natick, MA (US);
GTE Laboratories Incorporated, Waltham, MA (US);
Abstract
A broadband switching matrix having M.times.N crosspoint switches is arranged into a selected number of groups of vertically cascaded stages in which adjacent groups are interconnected with expansion stages. An input signal switched from row to column in a particular group propagates through the remaining stages in that group and then propagates successively through the expansion stages in each following group before reaching an output port. In another array configuration, a set of N multiplexers arranged in parallel each receive N input signals and provide a single output signal at a respective output port. The multiplexers are constructed from 2:1 selector elements which are arranged in a vertical tree configuration having log.sub.2 N cascaded stages. Each multiplexer has the same number of stages and hence selector elements. Both broadband switching arrays are designed so that each switch drives only one other switch in the array, thereby minimizing capacitive loading and maximizing propagation speed.