Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Low distortion audio range class-AB full H-bridge pre-driver amplifier










Image Number 2 for United States Patent #6353298.

A circuit (40) and method for applying drive voltages to a voice coil motor (VCM) (22) of a mass data storage device (10) has two driver sets, each having a high side driver (HSD) (42,46) and a low side driver (LSD) (44,48) connected to the VCM (22). Each driver set has two SENSEFETs (50,52), each having a power FET and a sense FET. A circuit (106,104) is provided for sensing a sense current in the sense FET of the LSD, and a circuit (60,76,74) is provided for increasing the bias on the gates of the SENSEFET (52) in the LSD when the sense current falls below a predetermined level (VREF). Also, a circuit (113,114,110) is provided for driving a predetermined current in the SENSEFET of the HSD when the sense current falls below the predetermined level. Thus, a current at the predetermined level always flows in the SENSEFETs (50,52).








 
 
  Recently Added Patents
Grip for a racket
Methods to fabricate a photoactive substrate suitable for microfabrication
Method for producing interferon alpha 5
Server chassis
Fuel-based injection control
Method and apparatus to adjust received signal
Vaccination with killed but metabolically active (KBMA) protozoans with toll-like receptor agonists
  Randomly Featured Patents
Coffee roaster filter, chaff collector and smoke reducer
Non-invasive sensor capable of determining optical parameters in a sample having multiple layers
Prosthetic urinary sphincter
Impeller
Plastic dental matrix and method of manufacturing same
Resin coated sand and method for producing same
Multilayer printed wiring board
Dual clock interface for an integrated circuit
Perfume bottle
cDNA-genomic DNA hybrid sequence encoding APP770 containing a genomic DNA insert of the KI and OX-2 regions