Patent ID: 6038090
Filing Date: 2000-03-14
Classification: G11B

Abstract:
An apparatus for improving data recovery for a magneto-resistive head, comprising:a circuit path carrying digital data signals read from a recording media by a magnetic head;an amplifier, coupled to the circuit path, for amplifying the digital data signals;a recovery time setting means, coupled to the amplifier, the recovery time setting means having a programmable recovery time constant associated with the recovery time setting means, the recovery time constant being adjusted to set a recovery time for the amplifier to optimize phase shift and amplitude reduction at low frequency data patterns, which provide readable data signals representing the digital data signals read by the magnetic head after a disturbance to the magnetic head; anda digital controller, coupled to the recovery time setting means, for adjusting the recovery time setting means to change the recovery time constants in response to a disturbance to the magnetic head;wherein the amplifier comprises a magnetic head preamplifier, wherein the recovery time setting means comprises an operational transconductance amplifier coupled to the preamplifier and wherein the recovery time constant comprises a selectable gain for the operational transconductance amplifier, the gain being selected to set a recovery time for the preamplifier.