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:
Jan. 13, 2009
Filed:
Apr. 22, 2005
Edris Rostami, Los Angeles, CA (US);
Alireza Mehrnia, Los Angeles, CA (US);
Rahim Bagheri, Los Angeles, CA (US);
Masoud Djafari, Marina Del Rey, CA (US);
Edris Rostami, Los Angeles, CA (US);
Alireza Mehrnia, Los Angeles, CA (US);
Rahim Bagheri, Los Angeles, CA (US);
Masoud Djafari, Marina Del Rey, CA (US);
Wilinx Corporation, Los Angeles, CA (US);
Abstract
Embodiments of the present invention include circuits and methods for reducing DC Offset. In one embodiment the present invention includes storing DC offset on internal capacitances. In one embodiment, parallel stages are used to remove DC offset corresponding to different local oscillator frequencies. Embodiments of the invention further include changing the low cutoff frequency of the DC cancellation circuits for fast calibration. In a first state, a high pass filter may have a first low cutoff frequency, and in a second state the high pass filter may have a second cutoff frequency lower than the first low cutoff frequency. The present invention also includes a variable gain amplifier with reduced DC offset.