Browse Prior Art Database

Capacitor Read Only Memory

IP.com Disclosure Number: IPCOM000095732D
Original Publication Date: 1964-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Schick, HC: AUTHOR [+2]

Abstract

This capacitor read-only memory utilizes coaxial cables as the capacitive memory elements.

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Capacitor Read Only Memory

This capacitor read-only memory utilizes coaxial cables as the capacitive memory elements.

As shown at A, the external shield of a coaxial cable is selectively etched so that relatively long sections 10 and 12 and relatively short sections 14 of the outer copper shield conductor remain. These portions of the copper shield are insulated from center conductor 16 by an insulating medium 18. To form the memory, each coaxial conductor is so etched and laid into a notched circuit board 20 shown at B. Board 20 is provided with copper drive lines 22, 24 and 26, which are oriented orthogonally to the direction of the coaxial cables so that the lengths of copper shield are aligned with the specific drive lines. Once the coaxial cables are in place, the portions of copper shield are soldered to their respectively aligned drive lines. Central conductors 28, 30 and 32 are then used to provide the outputs from the memory.

The capacitance between the longer sections of copper shields, e.g., 36 and the inner conductor, e.g., 30, is considerably higher than that between the inner conductor and the short section of shield, e.g., 40. These differences in capacitance cause like differences in the voltage coupled between the drive lines and output conductors. By differentiating between the values, 1's and 0's can be permanently store and sensed. At C, is shown the electrical analogy of the memory shown at 13. As an operative example, if drive line 22 is pul...