Monitoring circuit for a light emission device
AssigneeSumitomo Electric Industries, Ltd.
InventorKazuo Murayama
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Abstract
There is disclosed a monitoring circuit for a light emission device comprising; conversion circuit for converting a current flowing through a light emission device when a drive signal is applied thereto a voltage; shift adjustment circuit for producing shift adjustment signal of a variable output level; and a feedback type amplification unit for amplifying the output voltage of the conversion circuit to produce a monitor signal; wherein amplification unit includes gain control circuit for controlling gain of said amplification unit; the shift adjustment signal is supplied to a feedback loop of the amplification unit.
Claims7
A monitoring circuit for monitoring a light emission device, comprising:
- conversion means for providing a voltage signal based upon current flowing through said light emission device;
- means for amplifying said voltage signal of said conversion means to produce an amplified voltage;
- level adjustment means for producing a shift adjustment signal of a variable output voltage level;
- and
- feedback type amplification means for controlling further amplification of said amplified voltage by using a feedback loop and said shift adjustment signal to produce a monitor signal which has a linear relationship to the amount of light emitted by said light emission device.
A monitoring circuit for monitoring a light emission device, comprising:
- conversion means for providing a voltage signal based upon current flowing through said light emission device;
- shift adjustment means for producing a shift adjustment signal of a variable output voltage level;
- and
- feedback type amplification means for amplifying said voltage signal of said conversion means to produce an output monitor signal which has a linear relationship to the amount of light emitted by said light emission device, whereby said shift adjustment signal is supplied to a feedback loop of said feedback type amplification means.
Dependencies are inferred from the claim text.