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:
Apr. 11, 2017
Filed:
Nov. 27, 2014
Tan Siew Seong, Shenzhen, CN;
Chua Tiong Kee, Singapore, SG;
Tan Siew Seong, Shenzhen, CN;
Chua Tiong Kee, Singapore, SG;
AAC TECHNOLOGIES PTE. LTD., Singapore, SG;
Abstract
A capacitive sensor circuit includes a sensor for providing a sensing voltage, a pre-processing circuit electrically connected to the sensor via an input connection line, and an impedance transformation circuit electrically connected between the input connection line and a bias point. The impedance transformation circuit includes a first impedance unit and a second impedance unit. The first impedance unit includes a first current mirror, and the second impedance unit includes a second current mirror configured as an invented matching current mirror of the first current mirror. The first current mirror is electrically connected to the input connection line, and the second current mirror is electrically connected to the bias point to receive a bias voltage.