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:
May. 15, 2001
Filed:
Dec. 07, 1995
Applicant:
Inventors:
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M 1/66 ;
U.S. Cl.
CPC ...
H03M 1/66 ;
Abstract
A noise cancellation circuit for use with a digital signal includes a plurality of equally weighted cells (,) for providing an analogue output signal (,) in dependence upon the value of the digital signal. A switching arrangement (,) dynamically switches a number of the plurality of cells according to a sequencing scheme, which comprises a first sequence arranged to switch each of the plurality of cells (,) an equal number of times, and a second sequence arranged to define one of the plurality of cells (,) as a starting position for the first sequence. In this way low frequency tone generation within the analogue output signal is substantially eliminated.