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《Semiconductor Optoelectronics》 2011-03
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Study on Readout Integrated Circuit with Input Offset Voltage Compensation to Suppress Dark Current

HUANG Songlei1,2,ZHANG Wei1,2,HUANG Zhangcheng1,2,FANG Jiaxiong41(1.State Key Laboratories of Transducer Technology,Shanghai Institute of Technical Physics,Chinese Academy of Science,Shanghai 200083,CHN;2.Graduate University of Chinese Academy of Sciences,Beijing 100039,CHN)  
The dark current of InGaAs is one important indicator for evaluating the performance of detector materials.For the InGaAs with the cut-off wavelength of 2.4 μm,the dark current is two or three orders of magnitude larger than that of 1.7 μm InGaAs.In this article,the relationship of the dark current,noise and bias voltage is briefly introduced.The dark current and noise become smaller under lower bias voltage.And then a circuit structure is presented in detail,which is based on input offset voltage compensation to suppress the dark current of InGaAs.The circuit has two work modes of offset voltage compensation mode and no compensation mode.With offset voltage compensation,the bias voltage of InGaAs can be brought down to be less than 0.5 mV,even when the offset voltage of amplifier reaches 28 mV.
【Fund】: 国家自然科学基金资助项目(50632060)
【CateGory Index】: TN215
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