Signal-level detecting apparatus, optical receiver, and signal-level detecting method
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United States of America Patent
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Mar 23, 2010
Grant Date -
Feb 21, 2008
app pub date -
Oct 24, 2006
filing date -
Jun 14, 2006
priority date (Note) -
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Abstract
An amplifying unit performs a differential amplification with a highest level or a lowest level of an input signal and a previous input signal. A semiconductor element transfers a signal level output from the amplifying unit from a second terminal to a third terminal by using a current conducted from the second terminal to the third terminal in response to a voltage applied to a first terminal. A control unit controls the voltage applied to the first terminal of the semiconductor element based on a voltage or a current related to a reference semiconductor element. A holding unit holds a signal level output from the third terminal of the semiconductor element.
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