Photo detector circuit having a current mirror circuit
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United States of America Patent
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-
Nov 9, 1999
Grant Date -
N/A
app pub date -
Mar 10, 1998
filing date -
Mar 14, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A photo detector circuit comprises a photodiode for detecting a reflected light beam from an optical recording medium and converting the light beam to a current output, and a current-voltage converter for converting the output current of the photodiode to a proportional voltage. In this circuit, the output current of the photodiode is inputted via a current mirror circuit to the current-voltage converter, so that the S/N is improved and the entire circuit can be formed into a single chip to thereby decrease the number of external elements with another advantage of dimensional reduction.
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