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:
Feb. 21, 2012
Filed:
Aug. 17, 2009
Ming LI, Shanghai, CN;
Qingyang Wu, Shanghai, CN;
Liwu Yang, Shanghai, CN;
Yangyuan Wang, Shanghai, CN;
Ming Li, Shanghai, CN;
Qingyang Wu, Shanghai, CN;
Liwu Yang, Shanghai, CN;
Yangyuan Wang, Shanghai, CN;
Abstract
A charge pump circuit includes a switch unit adapted to transmit charges from the input of the charge pump to the output of the charge pump; a transmission unit adapted to control turn-on or cut-off of an MOS transistor in the switch unit; and a charging unit in one-to-one correspondence with a PMOS transistor in the switch unit and adapted to store charges to boost the transmission voltage. A first NMOS transistor and at least two PMOS transistor are used as the switch unit during transmission of the charges, so that normal work can be enabled with high transmission efficiency in the case of a low source voltage.