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. 22, 2006
Filed:
Jun. 22, 2004
Nobuhiro Sato, Tokyo, JP;
Nobuhiro Sato, Tokyo, JP;
Advantest Corp., Tokyo, JP;
Abstract
In a programmable power supply used in a semiconductor test apparatus, high-speed switching of a large current in a current rage or an output relay is enabled. In a MOSFET drive circuitof a switch portionprovided in a programmable power supplyof a semiconductor test apparatus, a capacitor portion-is charged with electric charges by a current from a light receiving portion-of a light insulating element-. When an SWA is turned on (SWB is turned off) by changeover of the analog switch portion-, a gate of each MOSFET in the MOSFET portionis charged with the electric charges stored in the capacitor portion-, and enters an ON state. On the other hand, when the SWB of the analog switch portion-is turned on (SWA is turned off), the gate of the MOSFET is discharged.