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:
Apr. 29, 1997
Filed:
Feb. 03, 1995
Thomas F Uhling, Monument, CO (US);
David J Dascher, Colorado Springs, CO (US);
Keith C Griggs, Colorado Springs, CO (US);
Other;
Abstract
A probe head includes integrated circuit chip inputs, a ground plane on a circuit board, and hundreds of probe leads comprising traces on the circuit board connected between the inputs and a circuit under test. Each trace is about 3 mils wide. There is a DICLAD polytetrafluoroethylene dielectric material of dielectric constant of about 2.2 between the ground and traces. Every other trace is electrically connected to the ground plane. Input resistors are buried in the circuit board and there is an on-chip input divider network. The customer defines the grounded pins of a circuit to be tested. Probe leads corresponding to the grounded pins are connected to the ground plane, maximizing the connections between the grounds of the probe and the circuit under test and minimizing unequal ground potentials.