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. 18, 2006
Filed:
May. 10, 2004
Feng Pan, San Jose, CA (US);
Trung Pham, Fremont, CA (US);
Feng Pan, San Jose, CA (US);
Trung Pham, Fremont, CA (US);
Sandisk Corporation, Sunnyvale, CA (US);
Abstract
In a Dickson type charge pump in which a plurality of serially connected diodes sequentially respond to anti-phase 50/50 clock cross over or overlapped (φ), efficiency of the charge pump is increased by providing with each diode a charge transfer transistor in parallel therewith between two adjacent nodes, and driving the charge transfer transistor to conduction during a time when the parallel diode is conducting thereby transferring any residual trapped charge at one node through the charge transfer transistor to the next node. Operating frequency can be increased by providing a pre-charge diode coupling an input node to the gate of the charge transfer transistor to facilitate conductance of the charge transfer transistor, and by coupling the control terminal of the charge transfer transistor to an input node in response to charge on an output node to thereby equalize charge on the control terminal and on the input node during a recovery period.