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. 13, 1999
Filed:
Dec. 20, 1996
Roger L Overton, New York, NY (US);
AirNet Communications Corp., Melbourne, FL (US);
Abstract
The Spurious-Free Dynamic Range (SFDR) in a broadband digital radio transceiver is typically limited by the required digital-to-analog converter which introduces differential nonlinearities that cause harmonic distortion in intermodulation products. The invention was a digital-to-analog conversion subsystem that coherently combines the outputs of two or more digital-to-analog converters that have different internal architectures. As a result, spurious responses are not correlated with one another while desired signal components do add coherently. The spurious responses therefore cancel in the combined output while the desired signal components add in phase. The overall result is to increase spurious-free dynamic range at the radio transmitter output.