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. 15, 2011
Filed:
Feb. 21, 2008
Applicant:
Chih-hong Lou, Yilan County, TW;
Inventor:
Chih-Hong Lou, Yilan County, TW;
Assignee:
Mediatek Inc., Hsin-Chu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R 3/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A microphone bias circuit is disclosed. A current source provides a first current. A voltage buffer provides a first reference voltage. A microphone coupled between the current source and the first reference voltage receives acoustic waves and converts the received acoustic waves to a second current. A loading device coupled between the current source and a second reference voltage lower than the first reference voltage outputs an output voltage according to the first current and the second current.