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:
Jul. 20, 1999
Filed:
Sep. 05, 1997
Lawrence D Engh, Redwood City, CA (US);
May Lee, San Jose, CA (US);
Information Storage Devices, Inc., San Jose, CA (US);
Abstract
An adaptive amplitude ramp controller that regulates how fast and how high a series of voltages is applied to a targeted non-volatile memory cell. The series of voltages include a coarse ramp pulse and at least one fine ramp pulse. The coarse ramp pulse undergoes a first ramp rate until a particular voltage is reached. Thereafter, it undergoes a second ramp rate until the cycle associated with the coarse ramp pulse is completed or a target voltage is reached. Programming of the non-volatile memory cell occurs during this portion of the course ramp pulse. Thereafter, the adaptive amplitude ramp controller produces at least one fine ramp pulse. The fine ramp pulse is quickly ramped up at a third ramp rate and then undergoes a fourth ramp rate until the final desired voltage of the non-voltage memory cell is generally reached.