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. 31, 1999
Filed:
Sep. 03, 1997
Applicant:
Inventor:
Hiroyuki Shiotsuka, Tokyo, JP;
Assignee:
Advantest Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
3241581 ; 324 731 ;
Abstract
A programmable load circuit is constructed from two current sources that serve as loads of a device under test, a diode bridge to which is impressed a threshold voltage for selecting the load and which is connected to the input/output pins of the device under test, a first switch and a second switch for connecting to the diode bridge the appropriate current source according to output of the device under test, two constant-voltage sources for charging and discharging parasitic capacitance of the diode bridge, and a third switch and a fourth switch that connect the constant-voltage sources and the diode bridge when the device under test is in a signal-inputting state.