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. 16, 2007
Filed:
Apr. 30, 2003
Applicants:
Jiren Yuan, Lund, SE;
Yijun Zhou, Lund, SE;
Inventors:
Jiren Yuan, Lund, SE;
Yijun Zhou, Lund, SE;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03C 1/00 (2006.01); H03C 3/00 (2006.01); H04L 27/36 (2006.01);
U.S. Cl.
CPC ...
Abstract
Various embodiments of a direct digital amplitude modulator (DDAM) for modulating radio frequency (RF) or intermediate frequency (IF) or baseband signal with the invented interpolation technique are disclosed. The interpolation technique greatly reduces the amplitudes of alias signals without using an analog filter. The embodiments therefore are significant for various communication transmitters to achieve simple structure, good linearity and high power efficiency.