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:
Nov. 12, 1991
Filed:
Jul. 13, 1988
Tushar R Gheewala, Cupertino, CA (US);
Cross-Check Technology, Inc., San Jose, CA (US);
Abstract
A new test structure is described which allows full testing of highly complex Integrated Circuits. The test structure consists of a grid of externally as well as individually accessible probe-lines and sense-lines with electronic switches at the crossings of said probe and the sense-lines. One end of the switches is tied to an array of test-points on the IC that are to be either monitored or controlled during the testing, and the other end of the switches is tied to a sense-line. The ON and the OFF states of the switches are controlled by probe-lines. The probe and sense lines are connected to test electronics, thus permitting the test electronics to control the electrical signals on the probe-lines and to measure or apply signals on the sense-lines. Thus, by the excitation of an appropriate probe-line and the monitoring of an appropriate sense-line, the test signals present at any one of the test-points can be measured. Conversely, by the excitation of an appropriate probe-line and application of a test signal on another appropriate sense-line the electrical signal on any of the test-points can be externally controlled for the purpose of testing.