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. 03, 2007
Filed:
Jan. 27, 2003
Daniel E. Fague, Andover, MA (US);
Thomas J. Liptay, Cambridge, MA (US);
Colm J. Prendergast, Cambridge, MA (US);
Edmund J. Balboni, Littleton, MA (US);
Daniel E. Fague, Andover, MA (US);
Thomas J. Liptay, Cambridge, MA (US);
Colm J. Prendergast, Cambridge, MA (US);
Edmund J. Balboni, Littleton, MA (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
Frequency offsets between a received carrier signal and a receiver's LO frequency are compensated by determining the offset and adjusting the phase of a demodulated signal derived from the modulated carrier. For frequency offsets that produce DC voltage offsets in I and Q components of the demodulated signal, the phase correction is implemented by operating upon the I and Q components with phase rotation operators in the form of sin θ and cos θ, where θ is an angle whose tangent is the result of dividing the Q by the I frequency offsets.