Programmable integrated crosspoint switch

Details Programmable integrated crosspoint switch Programmable integrated crosspoint switch

1988-10-17

1990-08-14

Olms, Douglas W.

Communications: electrical

Continuously variable indicating

With meter reading

357 45, 357 59, 361393, H04Q 118

Patent

active

049490842

ABSTRACT:
An interconnection device in the form of a programmable integrated crosspoint switch includes a matrix of first and second pluralities of electrically conductive paths, e.g. an M line by N line matrix, and selectively permanently and affirmatively programmable switch elements for completing passive conductive circuit paths between one or more of the conductive paths of such first and second pluralities thereof. The programmable integrated crosspoint switch invention may be utilized in various hierarchical levels of interconnection. Each switch element is an irreversible semiconductor switching element, for example of high resistivity polycrystalline material, that initially is a high impedance and, thus, effectively presents an open circuit-like condition, and each may be programmed by applying an appropriate electrical input thereto exceeding a given threshold level, whereupon the element permanently takes on a low impedance characteristic and effectively becomes a closed or short circuit between a respective pair of conductive paths without the need for transistor driving, logic or other circuits for useful operation. Thus, the semiconductor elements provide selectable interconnection at each crosspoint by application of programming voltage between the proper M line and N line of the matrix. The invention also relates to a method for rerouting electrical signals for various purposes.

REFERENCES:
patent: 4420820 (1983-12-01), Preedy

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