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:
Aug. 22, 2017
Filed:
Sep. 30, 2015
Applicant:
Synaptics Incorporated, San Jose, CA (US);
Inventors:
Zheming Li, San Jose, CA (US);
Saikrishna Ganta, San Jose, CA (US);
Tae-Song Chung, San Jose, CA (US);
Rafael Betancourt, Santa Clara, CA (US);
John Michael Weinerth, San Jose, CA (US);
Farzaneh Shahrokhi, San Jose, CA (US);
Assignee:
SYNAPTICS INCORPORATED, San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G09G 5/00 (2006.01); G06F 3/044 (2006.01); G06F 3/01 (2006.01); G06F 3/041 (2006.01);
U.S. Cl.
CPC ...
G06F 3/044 (2013.01); G06F 3/016 (2013.01); G06F 3/0416 (2013.01); G06F 2203/04108 (2013.01);
Abstract
A capacitance measurement circuit cancels background capacitance while reducing charge leakage and supply ripples during reset phases and integrate phases. The capacitance measurement circuit operates a first switch into a linear mode causing a first resistance in the first switch, and after a delay, operates a second switch into a saturation mode causing a second resistance in parallel to the first resistance.