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Browse Prior Art Database

Charge Redistribution Read Only Array

IP.com Disclosure Number: IPCOM000086672D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Sonoda, G: AUTHOR

Abstract

This is a field-effect transistor (FET) memory array incorporated on a monolithic substrate in which a charge redistribution principle is used to fully equalize current flowing into and out of the substrate, thereby avoiding voltage transients on the substrate.

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Charge Redistribution Read Only Array

This is a field-effect transistor (FET) memory array incorporated on a monolithic substrate in which a charge redistribution principle is used to fully equalize current flowing into and out of the substrate, thereby avoiding voltage transients on the substrate.

As illustrated in Fig. 1, four one device read-only store (ROS) cells, Q1 through Q4, form part of a large array of cells with n word lines and m bit lines in conjunction with bit-line restore devices Q5, Q6, and Q12; as well as bit switch devices Q7 and Q8 and detector devices Q9 and Q10. These devices perform their normal function in known read-only store configurations. By adding device Q11, the potential level at node A, as well as the charge level in capacitance C3, is set to a uniform desired level by the presence of the restore pulse at the gate of Q11. The charge is initially stored on capacitor C3 through the device Q11, which turns on during standby conditions and charges to the power supply voltage VH, which is less than the threshold voltage of Q11. During a selected operation, Q11 is turned off and charge is allowed to redistribute from C3 to C1, whenever "ones" exist along the selected word line (W.L.).

Nearly perfect coupling compensation is achieved independently of the data content, since capacitors C1 and C3 are dominated by diffusion capacitance, and C3 loses charge in the exact amount that C1 gains charge. Thus, no sensitivity exists to the number o...