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:
Jan. 18, 2005
Filed:
Feb. 14, 2003
Yasunori Yamamoto, Osaka, JP;
Taishi Iwanaga, Kyoto, JP;
Yasunori Yamamoto, Osaka, JP;
Taishi Iwanaga, Kyoto, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The amplitude expansion circuit as a main part of a drive circuit includes: a VM DC power supply line to which a voltage VM is applied; a VH DC power supply line to which a voltage VH roughly twice as high as the voltage VM is applied; an inverter circuit receiving a pulse signal oscillating between the ground voltage and the voltage VM; another inverter circuit receiving a pulse signal oscillating between the voltage VM and the voltage VH in correspondence with the oscillation of the voltage level of the above pulse signal; a p-channel MOSFET having a gate receiving an output from the inverter circuit; another p-channel MOSFET having a gate connected to the VM DC power supply line; an n-channel MOSFET having a gate connected to the VM DC power supply line; and another n-channel MOSFET having a gate receiving an output from the other inverter circuit. A common connection node of the p-channel MOSFET and the n-channel MOSFET works as the output terminal of the amplitude expansion circuit.