Optical signal detecting circuit and information reproducing device using the same
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United States of America Patent
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Nov 5, 2013
Grant Date -
Oct 15, 2009
app pub date -
Apr 9, 2009
filing date -
Apr 10, 2008
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Abstract
An object of the present invention is to achieve both low noise and fast response in an optical signal detecting circuit capable of providing all of three signals—a focus error signal, a tracking error signal, and an RF signal—with only a single detection system. A single current-to-voltage converter converts a current signal obtained by adding currents flowing through two photodiodes, into a voltage signal. Not only currents flowing into the photodiodes, but also currents flowing out from the photodiodes are taken out as the voltage signals. Moreover, by applying two different reference voltages to the current-to-voltage converters, a reverse bias voltage is applied between the terminals of each photodiode.
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