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. 06, 2015
Filed:
Apr. 22, 2014
Applicant:
Nxp B.v., Eindhoven, NL;
Inventors:
Han Martijn Schuurmans, Cuijk, NL;
Maarten van Dommelen, Nijmegen, NL;
Assignee:
NXP B.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03G 3/30 (2006.01); G07C 9/00 (2006.01); H03F 3/45 (2006.01);
U.S. Cl.
CPC ...
H03G 3/301 (2013.01); G07C 9/00309 (2013.01); G07C 9/00571 (2013.01); H03F 3/45071 (2013.01); G07C 2009/00634 (2013.01); G07C 2009/00777 (2013.01); G07C 2009/00793 (2013.01); H03F 2003/45008 (2013.01); H03F 2200/03 (2013.01); H03F 2203/45528 (2013.01); H03F 2203/45588 (2013.01);
Abstract
A true ground amplifier circuit in which a voltage sensor senses the output voltage and generates a binary output which indicates whether the output is above or below a threshold. A variable gain feedback system generates a feedback signal for combination with the digital input, thereby to provide offset cancellation. The variable gain is reduced over time to provide offset cancellation during an initial period of time of operation of the amplifier circuit. This provides offset cancellation during a start-up period, for example.