OFFSET CANCELLATION APPARATUS AND VOICE COIL MOTOR DRIVER INCLUDING THE SAME
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United States of America Patent
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Issued Date -
Mar 3, 2016
app pub date -
Aug 28, 2015
filing date -
Aug 28, 2014
priority date (Note) -
Abandoned
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Abstract
There is provided an offset cancellation apparatus including: a power amplifier forcibly generating an offset; a replica amplifier, which is the same replica amplifier as the power amplifier, having a non-inverting input terminal and an inverting input terminal connected to a non-inverting input terminal and an inverting input terminal, respectively, of the power amplifier and outputting an offset compensation determining signal; and an offset compensating unit applying an offset compensating current to the power amplifier and the replica amplifier based on the offset compensation determining signal. According to the offset cancellation apparatus, whether or not the offset is compensated may be accurately determined and additional switches for sensing the offset are not required, and since the same replica amplifier as the power amplifier is used, a configuration is simple and an operation for canceling the offset is simple, thereby making it possible to rapidly cancel the offset.
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