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Balanced Capacitor Read Only Storage Unit

IP.com Disclosure Number: IPCOM000094824D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Southard, CD: AUTHOR

Abstract

To improve the signal-to-noise ratio in a capacitor read-only storage unit, each data bearing document provides two drive lines per data word. One line is driven positively, the other negatively.

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Balanced Capacitor Read Only Storage Unit

To improve the signal-to-noise ratio in a capacitor read-only storage unit, each data bearing document provides two drive lines per data word. One line is driven positively, the other negatively.

Memory card 1 has conductive tabs 2 arranged in columns and rows. All tabs 2 in each row are disposed between and connected via leads 3 and 4 in parallel to both a negative drive line 5 and a positive drive line 6, respectively. To denote a binary 0 at a particular bit position, e.g., 7, the appropriate lead 4 is severed, removed or omitted to disconnect the corresponding tab 2 from drive line 6. To denote a binary 1 at a particular bit position, e.g., 8, the appropriate lead 3 is eliminated to disconnect corresponding tab 2 from drive line 5.

Tabs 2 overlie corresponding tabs 9 on memory board 10 and are separated from it by a dielectric film. The tabs on 1 and 10 constitute the respective plates of unique capacitors at each bit position. Sense lines 11 are provided on board
10. Each sense line passes through all tabs 9 in a respective column to enable readout of the respective words on card 1. This occurs when negative and positive signals are concurrently applied to 5 and 6, respectively, of a selected one of words W1...W6 via conductive pads 12 and 13. Thus, a 1 bit in the selected word produces in the corresponding sense line a voltage signal of one polarity. A 0 bit produces a voltage signal of equal amplitude but opposite ...