The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 1999
Filed:
Apr. 18, 1997
Jemmy Wen, Hsinchu, TW;
Abstract
A ROM structure and its method of manufacture using separate parallel trench bit lines for increasing memory component density as well as using a diode as the fundamental memory unit, each diode having a junction formed inside a bit line with a forward biased voltage of about 0.4 V and a reverse biased voltage dependent upon the doping condition in an N.sup.- region. At a junction between a word line and a bit line, either an ON state or an OFF state diode memory unit is created depending on whether a contact opening in the insulating layer for connection between the two is formed or not. When a definite operating voltage is applied to the word line, the stored information bit in the diode memory unit can be read off from the bit line by sensing a cut-off or a conducting current representing previous program coding of the diode memory unit.