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:
Apr. 08, 2008
Filed:
Jun. 12, 2006
Yonggang Wu, Santa Clara, CA (US);
Nian Yang, Mountain View, CA (US);
Boon-aik Ang, Santa Clara, CA (US);
Yonggang Wu, Santa Clara, CA (US);
Nian Yang, Mountain View, CA (US);
Boon-Aik Ang, Santa Clara, CA (US);
Spansion LLC, Sunnyvale, CA (US);
Abstract
A method and apparatus are provided for improved noise reduction from switching on and off drain pumps () in a high voltage generator. The drain pumps () are divided into groups () and activation of the groups () of drain pumps () is staggered (). In addition, when drain pumps are switched on and off for power conservation or to maintain a steady state high voltage level, the groups () of drain pumps () are switched on and off in response to various predetermined high voltage levels (), with different voltage levels for different groups () of drain pumps ().