Patent Number: 6,297,919

Title: Write head with switchable impedance and method for operating same

Abstract: A write head is described having a switchable damping resistance coupled in parallel with an inductor. The damping resistance is decoupled from the inductor by rendering a transistor nonconductive when a direction of current in the inductor changes. The damping resistance is then coupled to the inductor before oscillations begin in the current in the inductor. The decoupling of the damping resistor eliminates power dissipation in the damping resistor during a change in the direction of current in the inductor.

Inventors: Pidutti; Albino (Udine, IT), de La Soujeole; Axel Alegre (Scott's Valley, CA)

Assignee: STMicroelectronics, Inc.

International Classification: G11B 5/09 (20060101); G11B 5/02 (20060101); G11B 5/00 (20060101); G11B 5/012 (20060101); G11B 005/09 ()

Expiration Date: 10/02/2018