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. 17, 2021
Filed:
Feb. 14, 2019
Applicant:
Rohm Co., Ltd., Kyoto, JP;
Inventor:
Yuji Shimada, Kyoto, JP;
Assignee:
ROHM CO., LTD., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F 3/044 (2006.01); G06F 3/041 (2006.01); G01R 27/26 (2006.01); H03F 3/45 (2006.01); H03F 3/26 (2006.01);
U.S. Cl.
CPC ...
G01R 27/2605 (2013.01); G06F 3/044 (2013.01); G06F 3/0416 (2013.01); G06F 3/04166 (2019.05); H03F 3/45475 (2013.01); G06F 3/04182 (2019.05); H03F 3/265 (2013.01); H03F 2200/129 (2013.01); H03F 2203/45116 (2013.01); H03F 2203/45512 (2013.01); H03F 2203/45528 (2013.01);
Abstract
A capacitance detection circuit for measuring an electrostatic capacitance, includes: a control signal generator configured to generate a control signal; a drive circuit having a push-pull type output stage and configured to apply a drive voltage to the electrostatic capacitance according to the control signal; a current detection circuit configured to generate a detection current which is a replica of a current flowing through the output stage of the drive circuit; and an integrating circuit configured to integrate the detection current to generate a detection voltage.