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. 19, 2010
Filed:
Sep. 22, 2006
Applicant:
Zeljko Ignjatovic, Rochester, NY (US);
Inventor:
Zeljko Ignjatovic, Rochester, NY (US);
Assignee:
University of Rochester, Rochester, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M 1/20 (2006.01); H03M 3/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A sigma-delta ADC (A) uses blue-noise (random, pseudo-random) modulation () to reduce the effect of the substrate noise. Pairs of blue-noise multipliers () are placed before and after each non-delayed integrator (). In the case of a sample-delayed integrator, the integrator is first separated into a non-delayed integrator () followed by the delay element (). The multiplying sequence is a sequence of 1's and −1 's that has blue-noise spectral characteristics (i.e., the spectrum has a low frequency deficiency).