Static information storage and retrieval – Systems using particular element – Semiconductive
Patent
1980-06-30
1982-04-06
Fears, Terrell W.
Static information storage and retrieval
Systems using particular element
Semiconductive
365177, 357 43, G11C 1140
Patent
active
043239862
ABSTRACT:
This is an electronic storage array used in data processing systems for the storage of information in the form of binary bits. The storage is fabricated in integrated circuit form, typically on a semiconductor chip, each storage cell being contained within a single isolated zone formed in the semiconductor chip. Each storage cell is DC stable and operates on a conductivity modulation principle, i.e. a cell conducts when it stores a binary "1" and the conductive state is maintained by conductivity modulation of an element of the cell, and the cell is non-conducting when storing a binary "0". In its most basic form, each cell includes at least two resistors formed in series in a P type semiconductor region. At least one of the resistors, formed in a lightly doped portion of the P type region, is a variable resistor having both high and low values of resistance. The high value of resistance is changed to a low value of resistance by injecting electrons from a proximate N type semiconductor region. The low value of resistance is then maintained by the current conducted through the storage cell during standby.
REFERENCES:
patent: 4070653 (1978-01-01), Ray et al.
patent: 4092735 (1978-05-01), McElroy
patent: 4142111 (1979-02-01), McElroy
patent: 4142112 (1979-02-01), Kroger
"An Improved Gambit Device Structure", Baliga, IEEE Transactions on Electron Devices, vol. ED-25, Dec. 1978, pp. 1411-1412.
"The Negit: A Surface Control Negative Impedance Transistor", Thomas, IEEE Transactions on Electron Devices, vol. ED-24, No. 8, Aug. 1977, pp. 1070-1076.
Fears Terrell W.
Galanthay Theodore E.
International Business Machines - Corporation
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