ARCHITECTURE FOR A HARD DISK DRIVE WRITE AMPLIFIER CIRCUIT WITH DAMPING CONTROL

摘要

A write amplifier circuit (300) in a magnetic storage system has a cross coupling circuit (80) and an active damp circuit (90) to supply an improved write current (IW(t)) to the head (50) writing the data onto the media within the magnetic storage system. The inclusion of the cross coupling circuit decreases a rise time and a fall time associated with the write current. The active damp circuit reduces the undershoot and ringing of the write current. Thus, the write amplifier circuit is suitable for high speed data storage writing applications requiring minimal distortion of the data written to a magnetic medium. The cross coupling circuit provides a feedforward path (89) within the write amplifier circuit to increase the write current available for the head. The active damp circuit provides a negative feedback path from the output terminals of the write amplifier circuit to damp an undershoot and ringing associated with the write current.