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:
Sep. 01, 2009
Filed:
Jan. 26, 2007
Dejan Mijuskovic, Chandler, AZ (US);
Liviu Chiaburu, Chandler, AZ (US);
Dejan Mijuskovic, Chandler, AZ (US);
Liviu Chiaburu, Chandler, AZ (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
An apparatus and method are provided for reducing noise in a capacitive sensor (). One apparatus includes a gain stage () including an output, the gain stage configured to generate a first signal having a noise component and a second signal having a desired output component and the noise component, and a filtered-sampling stage () having an input coupled to the gain stage output, the filtered-sampling stage configured to sample the first signal, store the first signal, and subtract the first signal from the second signal to produce a desired output signal. A method includes generating a first signal having a first noise component of the gain stage (), storing the first signal (), generating a second signal comprising a desired output component and the first noise component (), and subtracting the first signal from the second signal to produce a first output signal having the desired output component ().