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:
Aug. 18, 1998
Filed:
Jun. 26, 1996
Applicant:
Inventors:
Charles L Vinn, Milpitas, CA (US);
Bruce G Armstrong, San Mateo, CA (US);
Assignee:
Other;
Primary Examiner:
Int. Cl.
CPC ...
H03G / ;
U.S. Cl.
CPC ...
330 51 ; 330149 ; 381 94 ; 381120 ;
Abstract
An audio amplifier that does not exhibit a 'pop' during a change-of-state such as being turned on. The popless amplifier includes an operational amplifier to power a speaker, a circuit to prevent the application of an output voltage from the operational amplifier to the speaker for a selectable period of time and a circuit to charge the output of the operational amplifier to a selectable mid-rail voltage during the time a voltage from the operational amplifier is prevented from reaching the speaker.