Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Reexamination Certificate
2005-10-25
2005-10-25
Sniezek, Andrew L. (Department: 2651)
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
C360S046000, C360S067000
Reexamination Certificate
active
06958872
ABSTRACT:
A circuit for measuring signal output of a transducer includes an amplifier having a differential input and a single ended output referenced to a fixed potential. One transducer terminal is coupled through a source follower to an input terminal of the differential input and the other transducer terminal is coupled through a source follower and a resistive element to the other input terminal of the differential input whereby the transducer terminals are isolated from the fixed potential. A voltage to current converter converts the voltage at the single ended output to an output current that is applied to an input branch of a current mirror. A first output branch of the current mirror supplies a current equal to the converter output current to one terminal of the differential input. A second output branch of the current mirror supplies a current equal to the converter output current to the other terminal of the differential input. A third output branch of the current mirror supplies a multiple of the converter output current to a resistive element having a terminal connected to the fixed potential.
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patent: 2003/0053239 (2003-03-01), Jiang
Cheng Yi
Lam Steven
Marvell International Ltd.
Sniezek Andrew L.
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