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. 22, 2013
Filed:
Jul. 25, 2007
Philip Quinlan, Glounthaune, IE;
Miguel Chanca, Valencia, ES;
Hyman Shanan, Douglas, IE;
Vincent Foley, Blarney, IE;
Philip Quinlan, Glounthaune, IE;
Miguel Chanca, Valencia, ES;
Hyman Shanan, Douglas, IE;
Vincent Foley, Blarney, IE;
Analog Devices, Inc., Norwood, MA (US);
Abstract
Image rejection calibration includes initializing the calibration mode by applying to quadrature mixers, in place of the wanted RF input, an RF source in the frequency range of the wanted RF input, sensing the power output from the poly-phase filter, developing gain adjust and phase adjust correction values in response to the power output and adjusting in accordance with the correction values the gain of the quadrature signals from the quadrature mixers to the poly-phase filter and the phase of local oscillator quadrature signals from the local oscillator to the quadrature mixers to reduce the power output.