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:
May. 17, 2022
Filed:
Jun. 26, 2019
Nordic Semiconductor Asa, Trondheim, NO;
Bartosz Gajda, Trondheim, NO;
Nordic Semiconductor ASA, Trondheim, NO;
Abstract
A circuit portion for indicating a mutual capacitance between a first and second node is provided. The circuit portion comprises a switchable constant current source arrangement configured to supply a first current to the first node in a first direction or a second current to the first node in a second, opposite direction; a variable voltage source configured to output a voltage to the second node so as to hold the first node at a reference voltage; and a comparator arrangement configured to switch between said first and second directions of the constant current source when the voltage output by the variable voltage source reaches a lower threshold voltage or an upper threshold voltage and to output a signal in synchrony with said constant current direction switching. The signal is indicative of the mutual capacitance between the first and second nodes.