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:
Mar. 09, 1999
Filed:
Aug. 28, 1996
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A signal switching apparatus performs precise and high speed measurements that indicate DUT breakdown. Several switching circuits having multiple signal switching apparatus provided in parallel with input terminals and output terminals. Each switching circuit is structured to have; (a) A first switch circuit which inputs the guard signal together with the low current measurement signal; (b) a current limiting circuit connected to a stress signal terminal on the input; (c) a second switch circuit connected on the input to the output of the current limiting circuit, having a guard terminal connected to the output of the first switch circuit; (d) A guarded line, one end of which is connected to the output terminals, and the other end of which is connected to the first switch circuit and the output of second switch circuit.