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:
May. 08, 2001
Filed:
Jul. 23, 1999
Applicant:
Inventors:
David W. Kelly, Lino Lakes, MN (US);
Robert A. Norman, Bloomington, MN (US);
Haoyan Chen, Eagan, MN (US);
Assignee:
Lucent Technologies, Inc., Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02R 2/300 ; G11B 5/596 ;
U.S. Cl.
CPC ...
H02R 2/300 ; G11B 5/596 ;
Abstract
An actuator circuit includes an H-bridge having sense and power FETs to drive a voice coil motor. A differential amplifier configuration is connected to the H-bridge. A bias circuit connected to the H-bridge and to current sources controls bias current through the one sense FET and one power FET and through the other sense FET and other power FET. A common mode feedback is circuit connected to the voice coil motor to provide common mode feedback to the differential amplifier configuration. The FETs, which may be unmatched, are operated to achieve class AB operation.