共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
一种高电源噪声抑制宽线性范围CMOS压控振荡器设计 总被引:3,自引:3,他引:0
给出了一种高电源噪声抑制、高线性范围CMOS压控振荡器的结构:电压调节器用于隔离外部电源以抑制高频与低频噪声.并提供稳定的内部电压给振荡器;振荡器部分则使用双环结构,同时采用改进的V-I电路,提高了VCO电压-频率转换特性的线性范围。在TSMC0.25μmN阱CMOSS工艺参数下仿真表明,VCO的输出频率范围为0.081GHz至1.53GHz.控制电压调节范围81%,线性度6.9%。当输出频率为1GHz时,电源电压变化1V引起的输出周期变化为3ps。 相似文献
3.
提出了一种基于连续时间积分器的高精度占空比调整电路,利用积分电压控制倒相器上升沿延迟,并进一步通过触发器合成50%占空比时钟。电路采用CMOS0.35μ m2P4M混合电路工艺实现。后仿结果表明,该电路能将30%~70%占空比的输入时钟自动调整至50%±0.2%。电路结构简单,芯片面积约为0.18mm×0.12mm,仿真功耗仅为0.2~0.4mW。该调整方法本身受电路、工艺失配影响小,且调整过程中保持调整前后下降沿对齐,便于与锁相环或延迟锁相环结合,进一步在调整占空比的同时,改善输出时钟的其他性能。 相似文献
4.
5.
一种基于互补型单电子晶体管的全加器电路设计 总被引:4,自引:0,他引:4
基于单电子晶体管(SET)的I-V特性和CMOS数字电路的设计思想,提出了一种由28个互补型SKT构成的全加器电路结构。该全加器优点为:简化了“P—SET”逻辑块;通过选取一组参数使输入和输出高低电平都接近于0.02mV和0mV,电压兼容性好;延迟时间短,仅为0.24ns。SPICE宏模型仿真结果验证了它的正确性。 相似文献
6.
锁相环(PLL)电路PLL(锁相环)电路的基本组成如图1。压控振荡器(VCO)是一种用电压控制振荡频率的电路。假定基准振荡器的频率为100kHz,若要构成一个700MHz 的PLL 路,VCO 的输出需经过分频系数 N=700的分频器。也得到一个100kHz 的信号,若两者完全相同,比较器输出的 VCO 的控制电压不变,就能得到稳定的70MHz 的输出。由于某种原因使频率发生变化,经比较器和 LPF 输出的电压产生高低变化,对 VCO 的振荡频率起到补偿作用,使振荡稳定。若频率增高,加在 VCO 上的电 相似文献
7.
8.
一种用于高速锁相环的新型CMOS电荷泵电路 总被引:5,自引:0,他引:5
提出了一种适用于高速锁相环电路的新型CMOS电荷泵电路。该电路利用正反馈电路提高电荷泵的转换速度,利用高摆幅镜像电流电路提高输出电压的摆动幅度,消除了电压跳变现象。电路设计和H-SPICE仿真基于BL 1.2μm工艺BSIM3、LEVEL=47的CMOS库,电源电压为2V,功耗为0.1mW。仿真结果表明,该电路可以很好地应用于高速锁相环电路。 相似文献
9.
10.
11.
Michael Reilly 《半导体技术》2004,29(12)
DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system. 相似文献
12.
Thomas M.Trexler 《半导体技术》2004,29(5)
From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test. 相似文献
13.
The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation. 相似文献
14.
The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high. 相似文献
15.
Today, micro-system technology and the development of new MEMS (Micro-Electro-Mechanical Systems) are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible. 相似文献
16.
GU Min-fen LIANG Zhong-cheng WANG Ren-zhou DONG Xiang-mei ZHANG Pei-ming CHEN Jia-bi 《光电子快报》2008,4(2):150-152
Waveguide multilayer optical card (WMOC) is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling & processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic (VB) language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor. 相似文献
17.
Qi-jiang Ran Pei-de Han Yu-jun Quan Li-peng Gao Fan-ping Zeng Chun-hua Zhao 《光电子快报》2008,4(4):239-242
This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel's. 相似文献
18.
The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well. 相似文献
19.
Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems. 相似文献
20.
An insert layer structure organic electroluminescent device(OLED) based on a new luminescent material (Zn(salen)) is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn(salen)/Liq/LiF/A1/CuPc/NPD/Zn(salen)/Liq/LiF/A1. Effective insert electrode layers comprising LiF(1nm)/Al(5 nm) are used as a single semitransparent mirror, and bilayer cathode LiF(1 nm)/A1(100 nm) is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect. 相似文献