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. 23, 2004
Filed:
May. 28, 2003
Applicant:
Inventors:
Assignee:
STMicroelectronics SA., Montrouge, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03M 3/00 ;
U.S. Cl.
CPC ...
H03M 3/00 ;
Abstract
A digital to digital Sigma-Delta modulator comprises an input which receives a digital input value encoded over N bits, an output which delivers a digital output value encoded over n bits, where n is less than N, and at least a first Sigma-Delta cell which includes a quantizer having a quantization interval which is a prime number. The choice of a prime number decreases the power of the limit cycles (lines with a power value higher than the local mean value) which may appear depending on the input code of the modulator and on the initial conditions. Application is proposed to a digital frequency synthesizer.