Laser diode drive circuit, electronic circuit, method for controlling laser diode drive circuit, and method for controlling duty
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United States of America Patent
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Sep 4, 2012
Grant Date -
Jan 29, 2009
app pub date -
Sep 30, 2008
filing date -
Mar 31, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A laser diode drive circuit includes: a duty control amplifier (23) that controls the duty ratio of a main signal for laser control in accordance with a duty control signal; and an AND gate (22) that outputs the duty control signal to the duty control amplifier (23), and outputs a duty control signal that controls the duty ratio of the main signal to be 0% in the duty control amplifier in accordance with a shutdown signal of a laser diode. With this structure, there is no need to input the main signal having the duty ratio controlled to a logic circuit that becomes unstable. Thus, outputs from a semiconductor laser can be shut down, and the output duty can be controlled in a stable manner.
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