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Application of Correlated Double Sampling in Space TDICCD Camera
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作者 HUANGMei-ling ZHANGBo-heng +1 位作者 BIANChuan-ping LILu-yao 《Semiconductor Photonics and Technology》 CAS 2005年第2期135-138,共4页
As a sampling technique for CCD output video signal, the correlated double sampling(CDS) technique is described as well as the filtering effects of the CDS technique on the output noise of CCD including the reset nois... As a sampling technique for CCD output video signal, the correlated double sampling(CDS) technique is described as well as the filtering effects of the CDS technique on the output noise of CCD including the reset noise of CCD, the white noise of output amplifier and 1/f noise. From real application of CDS device——TH7982A, it is concluded that the output signal-to-noise ratio of 50dB for CCD signal can be obtained. 展开更多
关键词 time delay and integration CCD correlated double samplings signal-to-noiseratio
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CCD signal acquisition and optimal digital denoise technology 被引量:1
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作者 Li Wencan Wen Yan +1 位作者 Wang Dong Yao Dalei 《High Technology Letters》 EI CAS 2021年第4期422-429,共8页
To reduce the charge-coupled device(CCD)readout noise and improve the detection ability under low illumination and dim targets,a new low-noise CCD signal processing technology-CCD digital denoiseis gradually being emp... To reduce the charge-coupled device(CCD)readout noise and improve the detection ability under low illumination and dim targets,a new low-noise CCD signal processing technology-CCD digital denoiseis gradually being employed in aerospace detection and other fields.In this study,the main readout noise of CCD detectors and its characteristics are analyzed.A CCD digital denoise system and an experimental platform are designed as well as established by using a PCIe data acquisition card.According to the characteristics of readout noise,some digital filters are analyzed and designed based on distributed kernel coefficient,and the optimal kernel coefficients are obtained through iteration.Then,CCD signal and filter model are established,and the optimal filter is designed to apply to the digital denoise system.Finally,according to the image data obtained from the system,the performance of the digital denoise system and digital filtering algorithm is evaluated and compared.At 500 kHz and 1 MHz CCD readout rates,the denoising performance of the optimal filter designed in the experiment is 16%-32%higher than that of the digital filter with kernel distribution coefficient,and 50%-60%higher than that of the traditional correlated double sampling technology. 展开更多
关键词 charge-coupled device(CCD) low noise reset noise digital correlated double sampling optimal filter
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Why Well Spread Probability Samples Are Balanced 被引量:3
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作者 Anton Grafstrom Niklas L.P.Lundstrom 《Open Journal of Statistics》 2013年第1期36-41,共6页
When sampling from a finite population there is often auxiliary information available on unit level. Such information can be used to improve the estimation of the target parameter. We show that probability samples tha... When sampling from a finite population there is often auxiliary information available on unit level. Such information can be used to improve the estimation of the target parameter. We show that probability samples that are well spread in the auxiliary space are balanced, or approximately balanced, on the auxiliary variables. A consequence of this balancing effect is that the Horvitz-Thompson estimator will be a very good estimator for any target variable that can be well approximated by a Lipschitz continuous function of the auxiliary variables. Hence we give a theoretical motivation for use of well spread probability samples. Our conclusions imply that well spread samples, combined with the Horvitz- Thompson estimator, is a good strategy in a varsity of situations. 展开更多
关键词 Balanced Sample Local Pivotal Method Spatial Balance Spatially correlated Poisson sampling Voronoi Polytopes
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A novel switched capacitor bandgap reference with a correlated double sampling structure
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作者 陈建广 郝跃国 程玉华 《Journal of Semiconductors》 EI CAS CSCD 2013年第2期109-112,共4页
A switched capacitor bandgap voltage reference with correlated double sampling structure embedded in a temperature sensor is implemented in a standard 0.35 um CMOS process. Due to the smaller change of the op-amp's o... A switched capacitor bandgap voltage reference with correlated double sampling structure embedded in a temperature sensor is implemented in a standard 0.35 um CMOS process. Due to the smaller change of the op-amp's output voltage, this topology is very suitable for low power applications. In addition, errors caused by the finite op-amp gain, input offset voltage, and 1/f noise are eliminated with the correlated double sampling technique. Additionally, two-level process calibration techniques are designed to minimize the process spread. Finally, a method of getting a full period valid reference voltage output is discussed and experimental results are provided to verify the effectiveness of the proposed structure. 展开更多
关键词 bandgap correlated double sampling low power switched capacitor
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A low-power high-quality CMOS image sensor using 1.5 V 4T pinned photodiode and dual-CDS column-parallel single-slope ADC
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作者 Wenjing Xu Jie Chen +3 位作者 Zhangqu Kuang Li Zhou Ming Chen Chengbin Zhang 《Journal of Semiconductors》 EI CAS CSCD 2022年第8期53-59,共7页
This paper presents a low-power high-quality CMOS image sensor(CIS)using 1.5 V 4T pinned photodiode(4T-PPD)and dual correlated double sampling(dual-CDS)column-parallel single-slope ADC.A five-finger shaped pixel layer... This paper presents a low-power high-quality CMOS image sensor(CIS)using 1.5 V 4T pinned photodiode(4T-PPD)and dual correlated double sampling(dual-CDS)column-parallel single-slope ADC.A five-finger shaped pixel layer is proposed to solve image lag caused by low-voltage 4T-PPD.Dual-CDS is used to reduce random noise and the nonuniformity between columns.Dual-mode counting method is proposed to improve circuit robustness.A prototype sensor was fabricated using a 0.11μm CMOS process.Measurement results show that the lag of the five-finger shaped pixel is reduced by 80%compared with the conventional rectangular pixel,the chip power consumption is only 36 mW,the dynamic range is 67.3 dB,the random noise is only 1.55 e^(-)_(rms),and the figure-of-merit is only 1.98 e^(-)·nJ,thus realizing low-power and high-quality imaging. 展开更多
关键词 CMOS image sensor 4T pinned photodiode single-slope ADC correlated double sample counting method
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320×240 Pixels CMOS Digital Image Sensor with Wide Dynamic Range
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作者 FANGJie WANGJing-guang HONGZhi-liang 《Semiconductor Photonics and Technology》 CAS 2004年第2期133-137,140,共6页
A 320×240 CMOS image sensor is demonstrated,which is implemented by a standard 0.6 μm 2P2M CMOS process.For reducing the chip area,each 2×2-pixel block shares a sample/hold circuit,analog-to-digital convert... A 320×240 CMOS image sensor is demonstrated,which is implemented by a standard 0.6 μm 2P2M CMOS process.For reducing the chip area,each 2×2-pixel block shares a sample/hold circuit,analog-to-digital converter and 1-b memory.The 2×2 pixel pitch has an area of 40 μm×40 μm and the fill factor is about 16%.While operating at a low frame rate,the sensor dissipates a very low power by power-management circuit making pixel-level comparators in an idle state.A digital correlated double sampling,which eliminates fixed pattern noise,improves SNR of the sensor, and multiple sampling operations make the sensor have a wide dynamic range. 展开更多
关键词 CMOS image sensor Digital image sensor PHOTODIODE Analog-to-digital converter correlated double sampling Fixed pattern noise
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MIXED-GRAINED CMOS FIELD PROGRAMMABLE ANALOG ARRAY FOR SMART SENSORY APPLICATIONS
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作者 Cheng Xiaoyan Yang Haigang +3 位作者 Yin Tao Wu Qisong Zhi Tian Liu Fei 《Journal of Electronics(China)》 2014年第2期129-142,共14页
The drive towards shorter design cycles for analog integrated circuits has given impetus to the development of Field Programmable Analog Arrays(FPAAs),which are the analogue counterparts of Field Programmable Gate Arr... The drive towards shorter design cycles for analog integrated circuits has given impetus to the development of Field Programmable Analog Arrays(FPAAs),which are the analogue counterparts of Field Programmable Gate Arrays(FPGAs).In this paper,we present a new design methodology which using FPAA as a powerful analog front-end processing platform in the smart sensory microsystem.The proposed FPAA contains 16 homogeneous mixed-grained Configurable Analog Blocks(CABs) which house a variety of processing elements especially the proposed fine-grained Core Configurable Amplifiers(CCAs).The high flexible CABs allow the FPAA operating in both continuous-time and discrete-time approaches suitable to support variety of sensors.To reduce the nonideal parasitic effects and save area,the fat-tree interconnection network is adopted in this FPAA.The functionality of this FPAA is demonstrated through embedding of voltage and capacitive sensor signal readout circuits and a configurable band pass filter.The minimal detectable voltage and capacitor achieves 38 uV and 8.3 aF respectively within 100 Hz sensor bandwidth.The power consumption comparison of CCA in three applications shows that the FPAA has high power efficiency.And the simulation results also show that the FPAA has good tolerance with wide PVT variations. 展开更多
关键词 Field Programmable Gate Array(FPGA) Field Programmable Analog Array(FPAA) Sensor Mixed-grained Configurable Analog Block(CAB) correlated Double sampling(CDS)
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Monte Carlo Method and Its Variance Reduction Techniques for On-stream Coal Slurry Parameter Determination
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作者 王汝赡 姜宏宇 《Tsinghua Science and Technology》 SCIE EI CAS 1998年第2期102-106,共5页
The special purpose Monte Carlo program McMesh was used to study neutron transport in coal slurries for on stream determination of the slurry parameters. McMesh uses the mesh weight window method as the major variance... The special purpose Monte Carlo program McMesh was used to study neutron transport in coal slurries for on stream determination of the slurry parameters. McMesh uses the mesh weight window method as the major variance reduction technique with other methods such as exponential transforms and correlated sampling included as options. There was good agreement between the calculated results from McMesh and from MCNP, a general Monte Carlo program, but McMesh was more efficient and more convenient. 展开更多
关键词 Monte Carlo method coal slurry variance reduction technique weight window correlated sampling
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Research on high-speed TDICCD remote sensing camera video signal processing 被引量:3
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作者 ZHANG Da XU Shu-yan MENG Qing-ju 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2009年第3期95-102,共8页
Video signal processing needs high signal-to-noise ratio (SNR) in high-speed time delay and integration charge coupled devices (TDICCD). To solve this problem, this article first analyzes the characteristics of th... Video signal processing needs high signal-to-noise ratio (SNR) in high-speed time delay and integration charge coupled devices (TDICCD). To solve this problem, this article first analyzes the characteristics of the output video signal of a new type of high-speed TDICCD and its operation principle. Then it studies the correlation double sample (CDS) method of reducing noise. Following that a synthesized processing method is proposed, including correlation double sample, programmable gain control, line calibration and digital offset control, etc. Among the methods, XRD98L59 is a video signal processor for the charge coupled device (CCD). Application of this processor to one kind of high-speed TDICCD with eight output ports achieves perfect video images. The experiment result indicates that the SNR of the images reaches about 50 dB. The video signal processing for high-speed multi-channel TDICCD is implemented, which meets the required project index. 展开更多
关键词 charge coupled device correlated double sample programmable gain control digital offset control
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Recent developments in two-dimensional (2D) correlation spectroscopy 被引量:9
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作者 Isao Noda 《Chinese Chemical Letters》 SCIE CAS CSCD 2015年第2期167-172,共6页
Recent noteworthy developments in the field of two-dimensional(2D) correlation spectroscopy are reviewed.2D correlation spectroscopy has become a very popular tool due to its versatility and relative ease of use.The... Recent noteworthy developments in the field of two-dimensional(2D) correlation spectroscopy are reviewed.2D correlation spectroscopy has become a very popular tool due to its versatility and relative ease of use.The technique utilizes a spectroscopic or other analytical probe from a number of selections for a broad range of sample systems by employing different types of external perturbations to induce systematic variations in intensities of spectra.Such spectral intensity variations are then converted into2 D spectra by a form of correlation analysis for subsequent interpretation.Many different types of 2D correlation approaches have been proposed.In particular,2D hetero-correlation and multiple perturbation correlation analyses,including orthogonal sample design scheme,are discussed in this review.Additional references to other important developments in the field of 2D correlation spectroscopy,such as projection correlation and codistribution analysis,were also provided. 展开更多
关键词 Two-dimensional correlation spectroscopy Hetero-correlation Multiple perturbation correlation Orthogonal sample design
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An A/D interface based on ∑△ modulator for thermal vacuum sensor ASICs 被引量:1
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作者 李金凤 唐祯安 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2010年第7期115-120,共6页
A newΣΔmodulator architecture for thermal vacuum sensor ASICs is proposed.The micro-hotplate thermal vacuum sensor fabricated by surface-micrornachining technology can detect the gas pressure from 1 to 10;Pa. The am... A newΣΔmodulator architecture for thermal vacuum sensor ASICs is proposed.The micro-hotplate thermal vacuum sensor fabricated by surface-micrornachining technology can detect the gas pressure from 1 to 10;Pa. The amplified differential output voltage signal of the sensor feeds to theΣΔmodulator to be converted into digital domain.The presentedΣΔmodulator makes use of a feed-forward path to suppress the harmonic distortions and attain high linearity.Compared with other feed-forward architectures presented before,the circuit complexity,chip area and power dissipation of the proposed architecture are significantly decreased.The correlated double sampling technique is introduced in the 1st integrator to reduce the flicker noise.The measurement results demonstrate that the modulator achieves an SNDR of 79.7 dB and a DR of 80 dB over a bandwidth of 7.8 kHz at a sampling rate of 4 MHz.The circuit has been fabricated in a 0.5μm 2P3M standard CMOS technology.It occupies an area of 5 mm;and dissipates 9 mW from a single 3 V power supply.The performance of the modulator meets the requirements of the considered application. 展开更多
关键词 integrated sensor analog to digital conversion feed-forward path correlated double sampling ΣΔmodulator
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A digital CDS technique and its performance testing 被引量:1
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作者 刘晓艳 陆景彬 +21 位作者 杨彦佶 陆波 王于仨 徐玉朋 崔苇苇 李炜 李茂顺 王娟 韩大炜 陈田祥 霍嘉 胡渭 张艺 朱玥 张子良 尹国和 王宇 赵仲毅 付艳红 张娅 马克岩 陈勇 《Chinese Physics C》 SCIE CAS CSCD 2015年第7期48-52,共5页
Readout noise is a critical parameter for characterizing the performance of charge-coupled devices(CCDs), which can be greatly reduced by the correlated double sampling(CDS) circuit. However, a conventional CDS ci... Readout noise is a critical parameter for characterizing the performance of charge-coupled devices(CCDs), which can be greatly reduced by the correlated double sampling(CDS) circuit. However, a conventional CDS circuit inevitably introduces new noise since it consists of several active analog components such as operational amplifiers. This paper proposes a digital CDS circuit technique, which transforms the pre-amplified CCD signal into a train of digital presentations by a high-speed data acquisition card directly without the noisy CDS circuit,then implements the digital CDS algorithm through a numerical method. A readout noise of 3.3 e- and an energy resolution of 121 e V@5.9 ke V can be achieved via the digital CDS technique. 展开更多
关键词 charge-coupled devices readout noise correlated double sampling
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A 10-bit column-parallel cyclic ADC for high-speed CMOS image sensors 被引量:2
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作者 韩烨 李全良 +1 位作者 石匆 吴南健 《Journal of Semiconductors》 EI CAS CSCD 2013年第8期177-182,共6页
This paper presents a high-speed column-parallel cyclic analog-to-digital converter(ADC) for a CMOS image sensor.A correlated double sampling(CDS) circuit is integrated in the ADC,which avoids a stand-alone CDS ci... This paper presents a high-speed column-parallel cyclic analog-to-digital converter(ADC) for a CMOS image sensor.A correlated double sampling(CDS) circuit is integrated in the ADC,which avoids a stand-alone CDS circuit block.An offset cancellation technique is also introduced,which reduces the column fixed-pattern noise(FPN) effectively.One single channel ADC with an area less than 0.02 mm^2 was implemented in a 0.13μm CMOS image sensor process.The resolution of the proposed ADC is 10-bit,and the conversion rate is 1.6 MS/s. The measured differential nonlinearity and integral nonlinearity are 0.89 LSB and 6.2 LSB together with CDS, respectively.The power consumption from 3.3 V supply is only 0.66 mW.An array of 48 10-bit column-parallel cyclic ADCs was integrated into an array of CMOS image sensor pixels.The measured results indicated that the ADC circuit is suitable for high-speed CMOS image sensors. 展开更多
关键词 CMOS image sensor column-parallel cyclic ADC correlated double sampling offset cancellation
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Exact Fixed-node Quantum Monte Carlo: Differential Approach
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作者 HUANG, Hong-Xin 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2005年第11期1474-1478,共5页
A differential approach for exact fixed-node quantum Monte Carlo calculation was proposed in this paper. This new algorithm can be used to directly compute the energy differential between two systems in exact fixed-no... A differential approach for exact fixed-node quantum Monte Carlo calculation was proposed in this paper. This new algorithm can be used to directly compute the energy differential between two systems in exact fixed-node quantum Monte Carlo process, making the statistical error of calculation reduce to order of 10^-2 kJ/mol and recover about more than 90% of the correlation energy. The approach was employed to set up a potential energy surface of a molecule, through a model of rigid move, and Jacobi transformation utilized to make energy calculation for two configurations of a molecule having good positive correlation. So, an accurate energy differential could be obtained, and the potential energy surface with good quality depicted. This novel algorithm was used to study the potential energy curve of the ground state of BH and the potential energy surface of H3, and could be also applied to study other related fields such as molecular spectroscopy and the energy variation of chemical reactions. 展开更多
关键词 exact fixed-node quantum Monte Carlo differential approach correlation sampling potential energy surface
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The Asymptotic Distributions of the Largest Entries of Sample Correlation Matrices under an α-mixing Assumption
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作者 Hao Zhu ZHAO Yong ZHANG 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2022年第11期2039-2056,共18页
Let{Xk,i;k≥1,i≥1}be an array of random variables,{Xk;k≥1}be a strictly stationaryα-mixing sequence,where Xk=(Xk,1,Xk,2,...).Let{pn;n≥1}be a sequence of positive integers such that c1≤p n n≤c2,where c1,c2>0.I... Let{Xk,i;k≥1,i≥1}be an array of random variables,{Xk;k≥1}be a strictly stationaryα-mixing sequence,where Xk=(Xk,1,Xk,2,...).Let{pn;n≥1}be a sequence of positive integers such that c1≤p n n≤c2,where c1,c2>0.In this paper,we obtain the asymptotic distributions of the largest entries Ln=max1≤i<j≤pn|ρ(n)ij|of the sample correlation matrices,whereρ(n)ij denotes the Pearson correlation coefficient between X(i)and X(j),X(i)=(X1,i,X2,i,...).The asymptotic distributions of Ln is derived by using the Chen–Stein Poisson approximation method. 展开更多
关键词 Sample correlation matrices α-mixing sequence Chen-Stein method
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Differential diffusion quantum Monte Carlo method: determination of potential energy surfaces of molecules
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作者 黄宏新 曹泽星 +3 位作者 曾先标 李泽林 曾越 杨志健 《Chinese Journal of Chemistry》 SCIE CAS CSCD 1999年第3期267-273,202,共7页
A differential approach for self-optimizing diffusion Monte Carlo calculation was proposed in this paper, which is a new algorithm combining three techniques such as optimizing, diffusion and correlation sampling. Thi... A differential approach for self-optimizing diffusion Monte Carlo calculation was proposed in this paper, which is a new algorithm combining three techniques such as optimizing, diffusion and correlation sampling. This method can be used to directly compute the energy differential between two system in the diffusion process, making the statistical error of calculation be reduced to Order of 10?-5 hartree, and recover about more than 80% of the correlation. We employed this approach to set up a potential energy surface of a molecule, used a “rigid move” model, and utilized Jacobi transformation to make energy calculation for two configurations of a molecule having good positive correlation. So, an accurate energy differential could be obtained, and the potential energy surface with good quality can be depicted. In calculation, a technique called “post-equilibrium remaining sample” was set up firstly, which can save about 50% of computation expense. This novel algorithm was used to study the potential as molecular spectroscopy and the energy variation in chemical reactions. 展开更多
关键词 Differential approach quantum Monte Carlo method correlation sampling potential energy surface
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