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. 06, 2005
Filed:
Feb. 14, 2002
Applicants:
Anthony Petrovich, Tewksbury, MA (US);
John R. Williams, Lexington, MA (US);
Christopher E. Dubé, Lexington, MA (US);
Inventors:
Anthony Petrovich, Tewksbury, MA (US);
John R. Williams, Lexington, MA (US);
Christopher E. Dubé, Lexington, MA (US);
Assignee:
The Charles Stark Draper Laboratory, Inc., Cambridge, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R023/00 ; G01R029/22 ; G01G003/16 ;
U.S. Cl.
CPC ...
Abstract
A sensor readout circuit which provides a frequency signal output including a phase detector circuit responsive to an output signal from a sensor and an input signal to the sensor and configured to detect the phase difference between the input signal and the output signal, and a drive circuit responsive to the phase detector circuit and configured to maintain a fixed phase difference between the input signal and the output signal.