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:
Oct. 03, 2017
Filed:
Jun. 04, 2015
Synaptics Incorporated, San Jose, CA (US);
Chunbo Liu, San Jose, CA (US);
Rafael Betancourt, Santa Clara, CA (US);
Tae-Song Chung, San Jose, CA (US);
Steve Chikin Lo, Sunnyvale, CA (US);
SYNAPTICS INCORPORATED, San Jose, CA (US);
Abstract
Various embodiments provide a processing module that calibrates a current-mode baseline correction system to account for features in an input device that lead to 'offset' in output of a charge integrator used for sensing presence of an input object. The offset is a difference between a common mode voltage, which is the average voltage output of the charge integrator over a sensing cycle and a mid-rail voltage midway between high and low power supply voltages. Calibration is performed by adjusting an N-side and/or P-side current flow duration parameter until common mode voltage falls within a low offset window in which the offset is deemed to be sufficiently close to the mid-rail voltage. The resulting duration parameters are stored and used for current-mode baseline corrections when operating an associated sensor electrode for capacitive sensing.