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:
Dec. 26, 2006
Filed:
Sep. 30, 2004
Applicant:
Daniel Ho, Palo Alto, CA (US);
Inventor:
Daniel Ho, Palo Alto, CA (US);
Assignee:
Via Technologies, Inc., Taipei, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 4/06 (2006.01); H03B 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A driver circuit is disclosed comprising an amplifier, a data DAC, and a voltage control mechanism (VCM). During a power up sequence, the VCM provides gradually increasing voltage signals to the amplifier to cause a voltage at the output of the amplifier to increase gradually. During a power down sequence, the VCM provides gradually decreasing voltage signals to the amplifier to causes the voltage at the output of the amplifier to decrease gradually. By gradually increasing and decreasing the voltage at the output of the amplifier in this way, pop noise caused by a rapid change in voltage can be reduced or even eliminated.