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:
Mar. 04, 2003
Filed:
Jun. 30, 2000
James F. Imbornone, Methuen, MA (US);
Jean-Marc Mourant, Groton, MA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
To overcome problems in an image reject mixer in a radio frequency receiver when there is a degradation in image rejection due to process variations, such as variations in the values of components, a reactance feedback path of a first differential amplifier in the intermediate frequency combiner of the image reject mixer is tuned during assembly of the radio frequency receiver. This tuning places the first differential amplifier and a second differential amplifier in the intermediate frequency combiner in phase quadrature when the pole frequency of reactance feedback path is at least ten times lower than the frequency of the intermediate frequency and sets the gain of the two differential amplifiers to be equal when the reactance of the reactance feed back path in the first differential amplifier is equal to the resistance of a resistance feedback path in second differential amplifier.