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. 20, 2002
Filed:
May. 30, 2001
Takao Myono, Gunma, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A charge-pump circuit has means biasing electrical potential of a substrate of a MOS transistor for control M so that forward direction current does not flow substantially through a,parasitic diode Dp . In the concrete, the substrate of the substrate of a MOS transistor for control M is biased by voltage of a connecting point of the substrate of a MOS transistor for control M and a capacitor at the case that the substrate of a MOS transistor for control M is P-channel type. Thus, it is prevented that a parasitic diode is biased to forward direction in a charge-pump circuit carrying out voltage fluctuation with lower voltage step than power source voltage Vdd so as to carry out normally charge-pump operation.