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:
Jun. 08, 2010
Filed:
Jun. 13, 2008
Yoshiaki Nozaki, Iga, JP;
Hiroshi Kawamura, Kashihara, JP;
John Kevin Twynam, Yamatokoriyama, JP;
Masatomo Hasegawa, Nara, JP;
Yoshiaki Nozaki, Iga, JP;
Hiroshi Kawamura, Kashihara, JP;
John Kevin Twynam, Yamatokoriyama, JP;
Masatomo Hasegawa, Nara, JP;
Sharp Kabushiki Kaisha, Osaka-Shi, JP;
Abstract
In a voltage clamp circuit, a normally-on type field-effect transistor having a negative threshold voltage has a drain connected to an input node, a source connected to an output node and grounded via a resistance element, and a gate supplied with an output voltage of a variable direct-current power supply. When a voltage at the output node becomes higher than a clamping voltage because of voltage drop of the resistance element, the field-effect transistor is tuned off. Accordingly, the output voltage is limited to be at most the clamping voltage. Thus, a response speed is higher than those of conventional voltage clamp circuits using diodes or the like.