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:
Jul. 16, 2019
Filed:
Jul. 14, 2017
Texas Instruments Incorporated, Dallas, TX (US);
TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US);
Abstract
An integrated circuit (IC) chip includes a substrate of a piezo-electric material having a first resistivity coefficient associated with a first direction that is longitudinal to a first crystal axis and a second resistivity coefficient associated with a second direction that is transverse to the first crystal axis. The first and second resistivity coefficients have opposite signs. The IC chip also includes a first stress sensing element formed in the substrate and coupled to pass a first current therethrough. The first stress sensing element includes a first resistor aligned such that the major direction of current flow through the first resistor is in the first direction and a second resistor coupled in series with the first resistor and aligned such that the major direction of current flow through the second resistor is in the second direction. A ratio of the resistance of the second resistor to the resistance of the first resistor is equal to a value α, where α is equal to the ratio of the first resistivity coefficient to the second resistivity coefficient.