Reduced hardware control circuit device with current loop for broad band hard disk drive applications

摘要

The present invention relates to a reduced hardware control circuit device with current loop for broad band Hard Disk Drive applications, of the type comprising a current loop for detecting the value of the current (I) flowing on the coils of a voice coil electric motor (M) incorporated in said Hard Disk Drive and including a sensing resistance (Rs), connected in series to the motor and at least a driving driver for a relative motor coil. Advantageously the current loop is a transconductance loop with a transconductance amplifier (Gm1) associated with the sensing resistance (Rs) and with a second transconductance amplifier (Gm2) for fixing the current value (I) to be applied to the motor(M).;The device according to the invention is deprived of a local compensation in correspondence with the first transconductance amplifier (Gm1).