http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Youtao Zhang (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
A 2 GS/s, 6-bit DAC for UWB Applications In 0.18 ㎛ CMOS Technology
Yi Zhang,Zhonghua Liu,Changchun Zhang,Yufeng Guo,Ying Zhang,Xiaopeng Li,Youtao Zhang,Hao Gao 대한전자공학회 2019 Journal of semiconductor technology and science Vol.19 No.6
To satisfy higher and higher transmission rate and broadband requirement of modern communication, high-speed, low-resolution Digital-to-Analog Converters (DACs) becomes the key element. In this paper, the design of a 2 GS/s, 6 bit DAC without calibration for Ultra-wideband (UWB) applications, is presented. The DAC is based on current steering architecture and is segmented with 4 bit unary and 2 bit binary. To realize larger linear range and fast switching, the source degeneration switch is designed instead of the traditional differential switch. The DAC is designed and taped-out in SMIC 0.18 ㎜ CMOS technology and the area is 975 ㎛´ 775 ㎛. The wafer bonding measurement results shows that the DNL is 0.11 LSB, INL is 0.25 LSB. Under a clock frequency of 2 ㎓, the DAC can achieve a SFDR of 51 ㏈ for input signal of 6㎒, and a SFDR of 32.4 ㏈ for Nyquist input while the power consumption is 79 ㎽.
-
A 32.2 GHz Full Adder Designed with TLE Method in a InP DHBT Technology
Yi Zhang,Xiaopeng Li,Youtao Zhang,Yufeng Guo,Ying Zhang,Hao Gao 대한전자공학회 2021 Journal of semiconductor technology and science Vol.21 No.6
Ultra-high-speed full adder is the bottleneck in a tens of GHz Direct digital synthesizer (DDS). In this paper, a 32.2 GHz, 1bit full adder in a 0.7 μm InP double hetero-junction bipolar transistor (DHBT) technology is presented. In such a high-speed circuit, signal integrity is a crucial issue. Therefore, a transmission line equivalent (TLE) method is proposed. With the TLE method, the design of the full adder could be simplified with good accuracy. The synchronous latch is combined with adding operation to improve the calculation speed. A single-level parallel-gated circuit is designed using majority decision algorithm to reduce power consumption. Measurement results show that the maximum clock frequency of the full adder is 32.2-GHz, and the overall power consumption is 350 mW. The full adder is successfully adopted in a 17 GHz, 8 bit DDS which can synthesize sin-wave outputs from 66.41 MHz to 8.5 GHz in 66.41 MHz steps with an average Spurious-Free Dynamic Range (SFDR) of -18.1 dBc.
-
Siyi Li,Meng Zhang,Xue Ma,Jing Qiao,Hongbo Zhang,Jun Wang,Youtao Song 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
In this work, an ortho-symmetric double (OSD) Z-scheme SnO2\CdSe/Bi2O3 sonocatalyst is skillfullydesigned and synthesized via ultrasonic-assisted isoelectric point method and then the sonocatalyticactivity is studied under ultrasonic irradiation in the degradation of organic contaminants. The effects ofultrasonic irradiation time, sonocatalyst dosage, initial Rhodamine B concentration, organic dye kind andused times are investigated systemically. The formation of OH and h+ are confirmed by using t-BuOH andoxalate, respectively. The Rhodamine B can completely be degraded under given experimental conditionssuch as 10 mg/L Rhodamine B solution, 1.00 g/L OSD Z-scheme SnO2\CdSe/Bi2O3 dosage and 150 minultrasonic process. The formation of mainly intermediate products is studied by Liquid Chromatography–Mass Spectrometry. Moreover, the sonocatalytic reaction mechanism caused by OSD Z-schemeSnO2\CdSe/Bi2O3 is presented.
-
Xue Ma,Siyi Li,Zhihui Qu,Meng Zhang,Jing Qiao,Xin Cui,Chunquan Wang,Jun Wang,Youtao Song 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
The separation efficiency of photogenerated electron-hole pairs (e –h+) is an important factor for ahighly photocatalytic activity of Z-scheme photocatalytic system. In order to suppress the recombining ofphotogenerated e and h+ and enhance the electron transfer rate, anthraquinone (AQ) as special electrontransfer channel is combined with NiGa2O4 and MoO3, forming a Z-scheme NiGa2O4/AQ/MoO3photocatalyst. Due to unique chemical and physical properties, AQ provides a novel electron transmissionway. Compared with traditional conductive channels (for example, noble metals and graphene), in thisway, the AQ may greatly enhance the electron transfer efficiency. In addition, the related morphology,optical properties and chemical composition were investigated by a sequence of characterizationmethods. The influences of photocatalyst species, irradiation time and used times in simultaneouslyconverting nitrite and sulfite under simulated sunlight were also studied. The results indicate that theprepared Z-scheme NiGa2O4/AQ/MoO3 photocatalyst exhibits a much high activity. The conversion ratesof nitrite and sulfite can reach 89.81% and 94.47%, respectively, under simulated sunlight irradiation forfour hours. The enhanced photocatalytic activity is attributed to the fact that AQ can rapidly transferelectron by inner charge transfer. This charge transfer way can provide a new idea to design subsequentphotocatalysts.
-
Bowen Li,Yidi Wang,Fangyuan Tian,Guanshu Li,Zhaohong Zhang,Jun Wang,Youtao Song 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
In order to expand the light response range of wide band-gap semiconductor photocatalyst (NaTaO3) for effective photocatalytic conversion of Cr(VI), an up-conversion luminescence agent (Er3+:YAlO3) is combined with NaTaO3 and a visible-light driven photocatalyst, NaTaO3/Er3+:YAlO3, is prepared. Moreover, several conduction band co-catalysts (Ag, Au and Pt) are deposited the surface of NaTaO3/Er3+: YAlO3, respectively, to facilitate the transfer rate of photo-generated electrons. X-ray diffractometer (XRD), energy dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM) analyses are employed to confirm the morphology, microstructure and composition of the prepared photocatalysts. In addition, UV–vis diffuse reflectance spectra are determined to explore the visible-light absorption properties of Er3+:YAlO3, NaTaO3, NaTaO3/Er3+:YAlO3 and X/NaTaO3/Er3+:YAlO3 (X = Ag, Au and Pt). Photoluminescence (PL) spectra are used to estimate the recombination rate of electron–hole pairs. The effects of irradiation time, photosource kind, solution acidity and used times on the photocatalytic capabilities of NaTaO3/Er3+:YAlO3 and X/NaTaO3/Er3+:YAlO3 (X = Ag, Au and Pt) are investigated in detail. The results show that the uses of up-conversion luminescence agent (Er3+:YAlO3) and co-catalysts (Ag, Au and Pt) can promote NaTaO3 to utilize visible-light to carry out the photocatalytic conversion of Cr(VI). Particularly, the prepared Au/NaTaO3/Er3+:YAlO3 nanocomposite with 1.0 wt% Au and 0.3:1.0 molar ratio of Er3+:YAlO3 and NaTaO3 shows the highest photocatalytic activity in conversion of Cr(VI).
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
