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Top-Down Design of 260k Color TFT-LCD One-Chip Driver ICs

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Journal of Semiconductors 2008年第4期29卷 706-712页

作者：魏廷存高武西北工业大学航空微电子中心西安710072

A top-down design methodology is proposed for the design of TFT-LCD one-chip driver ICs,and a 260k color, 176RGB× 220-dot TFT-LCD one-chip driver IC is successfully developed with silicon verification. This IC is a typical mixed-signal VLSI and is implemented by a 0.18μm HV CMOS process. The static power dissipation is about 5mW for 260k color display mode,and the settling time of the output grayscale voltages within 0.2% error is less than 26μs.

关键词： TFT-LCD driver IC top-down design driving circuit mixed-signal VLSI

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TFT-LCD驱动控制电路芯片研究

固体电子学研究与进展 2008年第2期28卷 258-263页

作者：魏廷存高武西北工业大学计算机学院西安710072

研制成功一款彩屏手机用262144色132RGB×176-dot分辨率TFT-LCD单片集成驱动控制电路芯片,提出了基于低/中/高混合电压工艺、数模混合信号VLSI显示驱动芯片的设计及其验证方法,开发了SRAM访问时序冲突解决电路、二级输出驱动电路和动态... 详细信息

研制成功一款彩屏手机用262144色132RGB×176-dot分辨率TFT-LCD单片集成驱动控制电路芯片,提出了基于低/中/高混合电压工艺、数模混合信号VLSI显示驱动芯片的设计及其验证方法,开发了SRAM访问时序冲突解决电路、二级输出驱动电路和动态负载补偿输出缓冲电路等新型电路结构,有效减小了电路的功耗和面积,抑制了回馈电压的影响,提高了液晶显示画面质量。采用0.25μm混合电压CMOS工艺实现的工程样片一次性流片成功,整个芯片的静态功耗约为5mW,输出灰度电压的安定时间小于30μs,芯片性能指标均达到设计要求。

关键词：薄膜晶体管液晶显示驱动芯片时序冲突验证模型

Two-Stage Driving Circuit for One-Chip TFT-LCD Driver IC

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Journal of Semiconductors 2007年第3期28卷 385-392页

作者：高武魏廷存高德远西北工业大学航空微电子中心西安710072

A two-stage driving circuit of a one-chip TFT-LCD driver IC for portable electronic devices is proposed. The driving buffers of the new circuit are built in the γ-correction circuit rather than in the source driver. The power consumption,die area, and driving capability of the driving circuit are discussed in detail. For a two-stage driving circuit with 13 driving buffers, the settling time of the driving voltage within 0.2% error is about 19.2μs when 396 pixel-loads are driven by the same grayscale voltage. The quiescent current of the whole driving circuit is 518μ~A,and the power consumption can be reduced by 77%. The proposed driving circuit is successfully applied in a 132RGB × 176-dot,260k color one-chip driver IC developed by us for the TFT-LCD of mobile phone, and it can also be used in other portable electronic devices, such as PDAs and digital cameras.

关键词： TFT-LCD source driver γ-correction grayscale voltage

Effect of diffraction on the ultrasonic velocity measuredby the pulse interference method in VHF range

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Chinese Journal of Acoustics 2002年第1期21卷 30-35页

作者： wei tingcun(Department of Electrical Engineering, Tohoku University Japan) Department of Electrical Engineering Tohoku University Japan

The effect of diffraction on the ultrasonic velocity measured by the pulse interference method has been investigated in VHF range theoretically and experimentally. Two silicate glasses are taken as the specimens, their frequency dependences of longitudinal velocities are measured in the frequency range of 50-350 MHz, and the phase advances of ultrasonic signals caused by diffraction effect are calculated using A. O. Williams' theoretical expression. For the velocity error due to diffraction effect, the experimental results are in good agreement with the theoretical prediction. It has been shown that the velocity error due to diffraction effect is directly proportional to dθ21 (f)/df, whereθ21 (f) is the phase advances difference between the two partial reflection signals used in velocity measurement and f is the ultrasonic frequency.

关键词： Effect of diffraction on the ultrasonic velocity measuredby the pulse interference method in VHF range VHF

Measurement errors of ultrasonic velocity and attenuation due to nonparallelness of specimen faces

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Chinese Journal of Acoustics 2003年第2期22卷 113-120页

作者： wei tingcun(Department of Electrical Engineering, Tohoku University Japan) Department of Electrical Engineering Tohoku University Japan

The measurement errors due to nonparallelness of specimen faces in the ultrasonic velocity and attenuation coefficient measured by the pulse reflection method in VHF range have been investigated theoretically, and the theoretical expressions for estimating these measurement errors are given. It has also been shown that, the attenuation coefficient error is depending on both the nonparallelness angle of specimen faces and the ultrasonic frequency, but the velocity error is only depending on the former. Furthermore, for pure silica glass specimen it is estimated that, in VHF range in order to insure that the attenuation coefficient and velocity errors due to nonparallelness of specimen faces are less than 10% and 0.01%, respectively, the nonparallelness angle of specimen faces must be less than 10 s and 40 s correspondingly.

关键词： of on it as Measurement errors of ultrasonic velocity and attenuation due to nonparallelness of specimen faces that is

Design of a Low-Noise Front-End Readout CSP-Shaper System for CZT Detectors

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Journal of Signal and Information Processing 2013年第2期4卷 118-122页

作者： Huiming Zeng tingcun wei Bo Gan Wu Gao School of Computer Science and Technology Northwestern Polytechnical University Xi’an China

This paper describes a low-noise front-end readout circuit for CZT detectors based on TSMC 0.35 um mixed-single CMOS technology;mainly analyzes the noise model of the detector-preamplifier and presents the low-noise circuit schematic of charge sensitive preamplifier and shaper. Considering the parasitical influences, the circuit and layout-design are optimized to reduce noise. The preliminary simulation results show that, the equivalent noise charge (ENC) is 74 e﹣ (rms), noise slope is 9 e﹣/pF, power consumption is 2 mW, and non-linearity

关键词： CZTdetector Front-End Readout CSP Low-Noise

Design of a Novel Front-End Readout ASIC for PET Imaging System

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Journal of Signal and Information Processing 2013年第2期4卷 129-133页

作者： Huiming Zeng tingcun wei Linkai Shen Wu Gao School of Computer Science and Technology Northwestern Polytechnical University Xi’an China

The architecture of a multi-channel front-end system is important for realizing a high-resolution PET system. We propose a novel front-end readout electronic system with TDC to deal with time information for PET system which can easily design the timing control. Each channel consists of a charge preamplifier, slow/fast shaper, discriminator and an analog memory. There are an ADC and a TDC to process the energy information and time information for each channel at the same time. In this paper, the whole system signals flow is all simulated by MATLAB. The simulation results show that the proposed system can process slender current from the detector and achieve the energy and time information. The proposed architecture can be applied to high-resolution PET imaging systems with multi-channel ASICs.

关键词： PET Front-End Readout Electronics TDC Positron Emission Tomography Imaging

Accurate measurement of ultrasonic velocity by eliminating the diffraction effect

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Chinese Journal of Acoustics 2003年第3期22卷 217-221页

作者： wei tingcun(Department of Electrical Engineering, Tohoku University Japan) Department of Electrical Engineering Tohoku University Japan

The accurate measurement method of ultrasonic velocity by the pulse interference method with eliminating the diffraction effect has been investigated in VHF range experimentally. Two silicate glasses were taken as the specimens, their frequency dependences of longitudinal velocities were measured in the frequency range 50-350 MHz, and the phase advances of ultrasonic signals caused by diffraction effect were calculated using A. O. Williams' theoretical expression. For the frequency dependences of longitudinal velocities, the measurement results were in good agreement with the simulation ones in which the phase advances were included. It has been shown that the velocity error due to diffraction effect can be corrected very well by this method.

关键词： of as on it by Accurate measurement of ultrasonic velocity by eliminating the diffraction effect into is that been

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面向压电振动能量俘获的电能管理电路综述

力学学报 2021年第11期53卷 2928-2940页

作者：陈楠刘京睿魏廷存西北工业大学电子信息学院西安710072 西北工业大学微电子学院西安710072

随着物联网(internet of things, IoT)技术的高速发展,传统的电池供电方式已经不能满足其供电需求.利用压电能量俘获技术将机械能转换为电能,可为IoT提供持久的电能,具有广阔的应用前景.本文在讨论压电振动俘能器的电学特性基础上,全面... 详细信息

随着物联网(internet of things, IoT)技术的高速发展,传统的电池供电方式已经不能满足其供电需求.利用压电能量俘获技术将机械能转换为电能,可为IoT提供持久的电能,具有广阔的应用前景.本文在讨论压电振动俘能器的电学特性基础上,全面总结了面向压电振动俘能器的电能管理电路的最新研究成果.电能管理电路通常由AC-DC变换和DC-DC开关变换器(包括控制算法)两部分组成,前者用于将压电振动俘能器输出的交流电转变为直流电,后者用于提高能量俘获效率.首先,针对AC-DC变换,分析了全桥整流器、电压倍增器、同步开关电感电路和同步开关电容电路的工作原理和优缺点.接着,重点讨论了用于压电振动俘能器的典型开关变换器电路,包括电感式、全电容式和变压器式DC-DC开关变换器以及AC-DC开关变换器,分析了它们的特点和适用场合.最后,针对压电振动俘能器的特点,分析了实现最大能量俘获的几种典型控制算法,包括最大功率点跟踪、阻抗匹配和同步电荷提取控制算法.本文通过对面向压电振动俘能器的电能管理电路的全面分析和综述,揭示了该领域目前存在的瓶颈问题,并展望了其未来发展方向,对压电能量俘获自供电系统的研究和开发具有重要的参考价值.

关键词：振动能量压电能量俘获电能管理最大能量俘获