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:
Nov. 19, 2002
Filed:
Sep. 24, 2001
Applicant:
Inventor:
Chien-Hung Ho, Kaohsiung, TW;
Assignee:
Ememory Technology Inc., Hsinchu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L 5/00 ;
U.S. Cl.
CPC ...
H03L 5/00 ;
Abstract
A two-stage negative level shifting circuit for preventing field breakdown due to an excessive voltage shift. The first stage has a first voltage distributor and a first driver and the second stage has a second voltage distributor and a second driver. In the first stage, an input voltage shifting between a positive voltage and a ground voltage is converted into a voltage shifting between a first negative voltage and the ground voltage. In the second stage, the voltage is further converted into a voltage shifting between the ground voltage and a second negative voltage, which has a larger absolute magnitude than the first negative voltage.