Electrostatic discharge protection circuit for...

Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier

Reexamination Certificate

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C360S046000, C360S323000

Reexamination Certificate

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10877033

ABSTRACT:
A magnetic storage system includes a read element including a tunneling giant magneto-resistive (TGMR) sensor. A shunting device includes a control terminal and first and second terminals that communicate with respective first and second terminals of the read element. The shunting device shorts said first and second terminals when said control terminal is not powered to protect the read element from electrostatic discharge. A first voltage limiting circuit limits voltage that is input to first terminals of said shunting device and said read element. Said first voltage limiting circuit includes first and second diodes. An anode of said first diode and a cathode of said second diode communicate with said first terminal of said read element and said first terminal of said shunting device and a cathode of said first diode and an anode of said second diode communicate.

REFERENCES:
patent: 6005733 (1999-12-01), Schuelke et al.
patent: 6067220 (2000-05-01), Ahmann et al.
patent: 6128149 (2000-10-01), Li
patent: 6429991 (2002-08-01), Tucker et al.
patent: 6891702 (2005-05-01), Tang

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