A 10-bit 500 kHz low-power successive approximation register(SAR)analog-to-digital converter(ADC)for cryogenic infrared readout circuit is proposed.To improve the simulation accuracy of metal-oxidesemiconductor field-...A 10-bit 500 kHz low-power successive approximation register(SAR)analog-to-digital converter(ADC)for cryogenic infrared readout circuit is proposed.To improve the simulation accuracy of metal-oxidesemiconductor field-efect transistors(MOSFETs),corresponding modification in device model is presented on the basis of BSIM3v3 with parameter extraction at 77 K.Corresponding timing is adopted in comparator to eliminate the influence caused by abnormal performance of MOSFETs at 77 K.The SAR ADC is fabricated and verified by standard 0.35μm complementary metal oxide semiconductor(CMOS)process.At 77 K,measurement results show that signal to noise and distortion ratio(SNDR)is 54.74 dB and efective number of bits(ENOB)is 8.8 at the sampling rate of 500 kHz.The total circuit consumes 0.6 mW at 3.3 V power supply.展开更多
Novel organic and inorganic hybrid photovoltaic devices were thbricated by in-situ electrochemical copolymerization of 3-methylthiophene（3MT） and bithiophene（BT） into the pores of nanostructured TiO2 sintered on f...Novel organic and inorganic hybrid photovoltaic devices were thbricated by in-situ electrochemical copolymerization of 3-methylthiophene（3MT） and bithiophene（BT） into the pores of nanostructured TiO2 sintered on fluorine-doped tin oxide（FTO） substrate. The photoactive layer was investigated by Fourier transform infrared（FTIR） spectroscopy, ultraviolet-visable（UV-Vis） spectrometer, scanning electron microscope（SEM） and cyclic voltammo- gram characterization. Device efficiency based on different molar feed ratios of 3MT and BT during electrochemical polymerization, and the effect of in-situ copolymer state（doped by electrolyte and de-doped） were measured and compared. Under the solar illumination of 100 mW/cm2（AM 1.5）, an optimized device efficiency of 0.938% was obtained when the molar ratio of 3MT to BT was 500：1, polymerization time was 500 s and the system was in doped copolymer state, respectively. The mechanism of overall photovoltaic parameter improvement was discussed.展开更多
基金the National Major Scientific and Technological Special Project of China(No.2012ZX03004008)the Science and Technology Pillar Program of Tianjin(No.11ZCKFGX01400)
文摘A 10-bit 500 kHz low-power successive approximation register(SAR)analog-to-digital converter(ADC)for cryogenic infrared readout circuit is proposed.To improve the simulation accuracy of metal-oxidesemiconductor field-efect transistors(MOSFETs),corresponding modification in device model is presented on the basis of BSIM3v3 with parameter extraction at 77 K.Corresponding timing is adopted in comparator to eliminate the influence caused by abnormal performance of MOSFETs at 77 K.The SAR ADC is fabricated and verified by standard 0.35μm complementary metal oxide semiconductor(CMOS)process.At 77 K,measurement results show that signal to noise and distortion ratio(SNDR)is 54.74 dB and efective number of bits(ENOB)is 8.8 at the sampling rate of 500 kHz.The total circuit consumes 0.6 mW at 3.3 V power supply.
基金the National Natural Science Foundation of China
文摘Novel organic and inorganic hybrid photovoltaic devices were thbricated by in-situ electrochemical copolymerization of 3-methylthiophene（3MT） and bithiophene（BT） into the pores of nanostructured TiO2 sintered on fluorine-doped tin oxide（FTO） substrate. The photoactive layer was investigated by Fourier transform infrared（FTIR） spectroscopy, ultraviolet-visable（UV-Vis） spectrometer, scanning electron microscope（SEM） and cyclic voltammo- gram characterization. Device efficiency based on different molar feed ratios of 3MT and BT during electrochemical polymerization, and the effect of in-situ copolymer state（doped by electrolyte and de-doped） were measured and compared. Under the solar illumination of 100 mW/cm2（AM 1.5）, an optimized device efficiency of 0.938% was obtained when the molar ratio of 3MT to BT was 500：1, polymerization time was 500 s and the system was in doped copolymer state, respectively. The mechanism of overall photovoltaic parameter improvement was discussed.
