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. 24, 2010
Filed:
Dec. 18, 2008
Applicants:
Julie Stultz, Scarborough, ME (US);
Steven M. Macaluso, Scarborough, ME (US);
Inventors:
Julie Stultz, Scarborough, ME (US);
Steven M. Macaluso, Scarborough, ME (US);
Assignee:
Fairchild Semiconductor Corporation, South Portland, ME (US);
Primary Examiner:
Int. Cl.
CPC ...
H03K 17/16 (2006.01); H03K 17/687 (2006.01);
U.S. Cl.
CPC ...
Abstract
A MOSFET switch is disclosed that is driven on by a circuit that provides a constant gate to source voltage, Vgs, that is independent of the input voltage, the power supply and any logic signals. The constant Vgs is derived from a reference voltage and biases the MOSFET switch such that Ron is constant, or Rflatness is minimized. A minimized Rflatness provides a higher fidelity transfer of audio signals compared to prior art switches where Rflatness is greater.