Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1996-08-28
1999-03-09
Gaffin, Jeffrey A.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
324 731, 324765, G01R 3126
Patent
active
058805400
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.
REFERENCES:
patent: 4215309 (1980-07-01), Frey
patent: 4637020 (1987-01-01), Schinabeck
patent: 4661791 (1987-04-01), Wakasugi et al.
patent: 4818934 (1989-04-01), Tamamura
patent: 5414352 (1995-05-01), Tanase
patent: 5644115 (1997-07-01), Knauer
Bessho Yoshiyuki
Iwasaki Yuko
Sone Norio
Gaffin Jeffrey A.
Hewlett--Packard Company
Paladini Albert W.
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