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:
Jun. 19, 2001
Filed:
Apr. 17, 2000
Applicant:
Inventors:
Khaled Maalej, Paris, FR;
Emmanuel Hamman, Paris, FR;
Amaury Demol, Paris, FR;
Yannick Levy, Paris, FR;
Assignee:
Atmel Corporation, San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03D 3/00 ; H03K 9/10 ; H04L 2/738 ;
U.S. Cl.
CPC ...
H03D 3/00 ; H03K 9/10 ; H04L 2/738 ;
Abstract
A quadrature amplitude modulation (QAM) type demodulator having a pair of direct digital synthesizer (DDS) circuits. The first DDS circuit is located in a baseband conversion circuit before a receive filter and digitally tunes the signal within the receive filter bandwidth. The second DDS circuit is within a carrier recovery circuit located after the receive filter and serves to fine tune the signal phase.