Li-Jun Zhang

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This paper presents an automatic gain control (AGC) amplifier with temperature compensation for high-speed applications. The proposed AGC consists of a folded Gilbert variable gain amplifier (VGA), a dc offset canceller, inductorless post amplifiers, a linear open-loop peak detector (PD), an integrator, a symmetrical exponential voltage generator, and a(More)
Power consumption is becoming a pressing issue in cache design. And SRAM (static random access memory) cells occupy a large area of the cache. Recent research shows that SRAM's power dissipation contributes to a key part of the whole chip power consumption. By using separate write and read operation, this paper presents a new 6T-SRAM cell structure of(More)
MERSI is the keystone payload of FengYun-3 and there have been two sensors operating on-orbit since 2008. The on-orbit response changes obviously at reflective solar bands (RSBs) and must be effectively monitored and corrected. However MERSI can not realize the RSBs onboard absolute radiometric calibration. This paper presents a new vicarious calibration(More)
Chinese MODIS onboard ShenZhou-3 spacecraft (SZ-3/CMODIS)is the experiment instrument of next generation environmental and meteorological satellites. CMODIS can obtain the data of 30 bands in visible and near infrared region from the earth-atmosphere system. But the quantitative application of these data is limited by radiometric calibration The present(More)
In this paper a two-port register file (RF) compiler with ultra high density design is presented. The memory implemented using a single port memory core, which is combined with a smart address selector circuit to reduce peripheral devices number and thus the silicon area is decreased significantly. The separate read and write replica scheme are implemented,(More)
In this paper, an integrated 512KB SRAM architecture with low power circuit design is presented. An extra Z decoding circuit is introduced, which is combined with divided wordline/bitline scheme to reduce half-selected memory cells and thus dynamic power is decreased significantly. In circuit level, we utilize source biasing scheme to achieve leakage(More)
Infrared spectroscopy (IR), the normal Raman spectroscopy (NRS) and the surface enhanced Raman spectroscopy (SERS) in new Ag/Cu nanomaterial of Rotundine were studied in the present paper. The IR and the NRS of Rotundine were calculated by the density functional theory (DFT) using B3LYP/6-311+G(d, p), then the spectral intensity graph of Rotundine were(More)
The three-dimensional model of 2500hp shale gas fracturing truck chassis frame was established and the natural frequency of the frame was obtained by modal analysis. Taking the displacement power spectrum density of a typical road as a random excitation, the random vibration response of frame was obtained by PSD module of finite element analysis software(More)