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:
Nov. 30, 2004
Filed:
Sep. 13, 1999
Applicant:
Inventor:
Brian J. Minnis, Crawley, GB;
Assignee:
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 2/712 ;
U.S. Cl.
CPC ...
H04L 2/712 ;
Abstract
A radio transmitter for multi-standard mobile communication systems has two stages of frequency up-conversion, the first being a digital process generating a variable IF and the second being an analogue conversion using a fixed frequency local oscillator, which alleviates the need for RF filtering after the final stage of power amplification. The IF frequency band is symmetrical about zero frequency and thus includes negative frequencies.