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US 6,487,030 B2Granted
Write head with switchable impedance and method for operating same
AssigneeSTMicroelectronics S.r.l.
InventorsAlbino Pidutti, Axel Alegre de la Soujeole
Life of this patent
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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.
Claims13
A write head for writing data to a magnetic storage medium comprising:
- an inductor coupled to a driving circuit, the driving circuit being structured to provide current to the inductor in a plurality of directions;
- and
- an impedance element selectively coupled to the inductor;
- a switch having an active state and an inactive state to selectively couple the impedance element to the inductor when the switch is in the active state and wherein no impedance element is coupled to the inductor when the switch is in the inactive state.
1 more element
Dependencies are inferred from the claim text.