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:
Aug. 26, 2003
Filed:
Oct. 02, 1998
Thorsten Schier, Sundbyberg, SE;
Svante Signell, Vällingby, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
A down-converter converts an amplitude modulated high frequency signal into a low frequency or baseband signal. A first mixer ( ) mixes the high frequency signal into a composite signal having an in-phase component and a quadrature component. A complex bandpass filter ( ) bandwidth limits the composite signal into a bandwidth limited signal with an in-phase component and a quadrature component. A second mixer ( ) mixes the bandwidth limited signal into an intermediate signal with an in-phase component and a quadrature component, and an adder ( ) adds one component of the intermediate signal to the other. A similar up-converter performs the reverse process.