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Balanced Capacitor Read Only Storage Unit

IP.com Disclosure Number: IPCOM000094825D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Tunis, CJ: AUTHOR

Abstract

In this card capacitor read-only storage unit, memory card 1 has a plurality of rows of drive lines 2. Each line 2 is connected in parallel to a selected number of conductive tabs 3 constituting the respective one plates of unique capacitors. One or more such cards are separated by a dielectric film from an etched printed circuit board 4 providing another set of conductive tabs 5 constituting the respective other plates of the unique capacitors. Board 4 has a plurality of sense lines 6, each serially connecting all of such other plates in a respective column.

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Balanced Capacitor Read Only Storage Unit

In this card capacitor read-only storage unit, memory card 1 has a plurality of rows of drive lines 2. Each line 2 is connected in parallel to a selected number of conductive tabs 3 constituting the respective one plates of unique capacitors. One or more such cards are separated by a dielectric film from an etched printed circuit board 4 providing another set of conductive tabs 5 constituting the respective other plates of the unique capacitors. Board 4 has a plurality of sense lines 6, each serially connecting all of such other plates in a respective column.

To improve the signal-to-noise ratio, a drive line 7 is connected to a balance or dummy word of all 0 bits 8. A drive line 7 is driven with a pulse of polarity opposite to that of the word being read out to create a cancelling effect for the noise resultant from the 0 bits of the addressed valid word. One such dummy word is preferably used per board to improve phase relationship between the drive signals to valid words and to the balancing dummy word. A single dummy word can, however, serve a large number of data words on each board.

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