TMR/GMR amplifier with input current compensation
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United States of America Patent
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May 12, 2009
Grant Date -
N/A
app pub date -
Jan 11, 2007
filing date -
Aug 30, 2004
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Abstract
An amplifier system with feedback current cancellation comprises an amplifier with at least one stage, a feedback network, first and second replica circuits, a buffer, second and third resistances, an operational amplifier (op-amp), a transistor, and a current mirror. The feedback network includes a first resistance that communicates with an input and an output of the amplifier. The first and second replica circuits approximately replicate DC characteristics of the output and the input of the amplifier, respectively. An output of the op-amp communicates with a control terminal of the transistor. The current mirror provides a current at the input of the amplifier that is proportional to a second current flowing through the transistor. The buffer communicates with the first replica circuit. The second resistance communicates with an output of the buffer. The third resistance communicates with the second resistance and with the second replica circuit.
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