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. 31, 2004
Filed:
Jul. 02, 2002
Applicant:
Inventors:
Juergen T. Rickes, Cupertino, CA (US);
Hugh P. McAdams, McKinney, TX (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 1/122 ;
U.S. Cl.
CPC ...
G11C 1/122 ;
Abstract
A method and circuit for determining the accuracy of a measurement of a bit line voltage or a charge distribution for readout from FeRAM cells uses sense amplifiers to compare a bit line voltage to a series of reference voltages and then determines upper and lower limits of a range of range of reference voltages for which sensing operation provide inconsistent results. One embodiment uses an output signal of a sense amplifier to control a pull-down transistor of an I/O line and alternative precharging schemes for the I/O line allow determining both limits using the same compression circuitry to process a result value stream on the I/O line.