12-GHz 0.25μmCMOS 1:2动态分频器

基于D触发器的电路结构 ,采用TSMC 0 .2 5 μmCMOS工艺 ,成功地实现了12GHz 1:2动态分频器。经测试 ,该分频器在输入信号频率为 10 .5 3GHz时 ,最小可分频幅度小于 2mV ,输入信号单端幅度小于 30 0mV时 ,可分频范围为 7GHz～ 12GHz。电源电压 3.3V ,核心功耗 2 4mW。

基于InP HBT工艺的100 GHz静态及动态分频器

南京电子器件研究所基于76．2mm（3英寸）InP HBT圆片工艺，研制出最高工作频率达100GHz的静态分频器以及动态分频器。图1为静态分频器测试结果，此电路可在2～100GHz范围内实现二分频。图2为动态分频器测试结果，此电路可在75～100GHz范围内实现二分频。

基于InP HBT工艺的超高速静态及动态分频器

磷化铟异质结双极型晶体管（InP HBT）具有超高速、高器件一致性、高击穿等优点，在超高速数模混合电路应用方面具有独特优势。南京电子器件研究所基于76．2mm InP HBT圆片工艺，研制出60GHz静态分频器以及92GHz动态分频器。图1为静态分频器测试结果，此电路可在2～60GHz范围内实现二分频。图2为动态分频器测试结果，此电路可在75～92GHz范围内实现二分频。

动态分频器技术

本文介绍了动态分频器的基本原理；详细叙述了动态分频器电路及其主要工艺技术；综述了国外动态分频器的发展动态。

W波段InGaAs/InP动态二分频器(英文)

采用fT=214 GHz,fmax=193 GHz的InGaAs/InP异质结双极型晶体管工艺,设计了一款基于时钟驱动型反相器的动态二分频器.该分频器工作频段为60～100 GHz,但由于测试系统上限频率的限制,只能测出62～83 GHz的工作范围.在-4.2 V和-5.2 V的单电源直流偏置下该分频器的功耗分别为596.4 mW、1060.8 mW.此分频器的成功制作对于工作在W波段锁相环的构建有较大的意义.

智能转速传感器设计

为了实现涡扇发动机的智能控制,针对传统传感器测量精度不高,易受外界环境干扰的问题,设计了一种通过测量发电机电压信号获取发动机转速的智能转速传感器,利用动态分频法进行了软件设计,并设计了软硬件抗干扰方案。实验结果表明,该智能传感器实时性好,测量精度高,抗干扰能力强,适用于涡扇发动机的分布式控制系统。

全数字锁相环SiC超高频感应加热电源分时控制探讨

在2 MHz的超高频感应加热电源研究背景下,通过两种理论分析方法来研究基于SiC器件的分时控制方法对开关损耗的影响,同时改进了FPGA全数字锁相环根据负载谐振频率的动态分频,从而扩大锁相范围。

The motion analysis of fire video images based on moment features and flicker frequency

In this paper, motion analysis methods based on the moment features and flicker frequency features for early fire flame from ordinary CCD video camera were proposed, and in order to describe the changing of flame and disturbance of non-flame phenomena further more, the average changing pixel number of the first-order moments of consecutive flames has been defined in the moment analysis as well. The first-order moments of all kinds of flames used in our experiments present irregularly flickering, and their average changing pixel numbers of first-order moments are greater than fire-like disturbances. For the analysis of flicker frequency of flame, which is extracted and calculated in spatial domain, and therefore it is computational simple and fast. The method of extracting flicker frequency from video images is not affected by the catalogues of combustion material and distance. In experiments, we adopted two kinds of flames, i. e. , fixed flame and movable flame. Many comparing and disturbing experiments were done and verified that the methods can be used as criteria for early fire detection.

Dynamic Subcarrier Assignment for OFDM-PON Network Based on RSOA for ACCORDANCE

In this paper, we overview the principle of Orthogonal Frequency Division Multiplexing Passive Optical Network （OFDM-PON） systems, with a particular focus on upstream architectures capable of achieving 10Gbit/s colorless upstream transmission using Reflective Semiconductor Optical Amplifier （RSOA）. We propose an architecture of RSOA based OFDM-PON which can achieve 10Gbit/s upstream transmission over a single wavelength. A novel Dynamic Subcarrier Assignment （DSA） algorithm is also proposed to support my architecture, namely Service based Polling in Pipeline （SPP） dynamic subcarrier algorithm. A simulation was conducted to study the performance of SPP algorithm. Compared with the traditional dynamic bandwidth allocation algorithms, service based polling meets the quality of in pipeline algorithm service requirements excellently, and adapts orthogonal frequency division multiplexing passive optical network better with higher bandwidth efficiency and lower algorithm complexity.

Modal analysis on transverse vibration of axially moving roller chain coupled with lumped mass

The modal characteristics of the transverse vibration of an axially moving roller chain coupled with lumped mass were analyzed.The chain system was modeled by using the multi-body dynamics theory and the governing equations were derived by means of Lagrange's equations.The effects of the parameters,such as the axially moving velocity of the chain,the tension force,the weight of lumped mass and its time-variable assign position in chain span,on the modal characteristics of transverse vibration for roller chain were investigated.The numerical examples were given.It is found that the natural frequencies and the corresponding mode shapes of the transverse vibration for roller chain coupled with lumped mass change significantly when the variations of above parameters are considered.With the movement of the chain strand,the natural frequencies present a fluctuating phenomenon,which is different from the uniform chain.The higher the order of mode is,the greater the fluctuating magnitude and frequency are.

Correction of Dynamic Error Result from Measurement System Limitations

The main cause of dynamic errors is due to frequency response limitation of measurement system. One way of solving this problem is designing an effective inverse filter. Since the problem is ill-conditioned, a small uncertainty in the measurement will came large deviation in reconstncted signals. The amplified noise has to be suppressed at the sacrifice of biasing in estimation. The paper presents a kind of designing method of inverse filter in frequency domain based on stabilized solutions of Fredholm integral equations of the fast kind in order to reduce dynamic errors. Compared with previous several work, the method has advantage of generalization. Simulations with different Signal-to-Noise ratio （SNR） are investigated. Flexibility of the method is verified. Application of correcting dynamic error is given.

Dynamic Properties of Long Large Cross-section Underground Structures in Dynamic Seismic Analysis

Seismic safety of underground structures is one of the main concerns in underground space exploitation. As the first step for dynamic seismic response analysis, the free vibration of long large cross-section underground structures is studied in the present paper. The general free transverse vibration motion equation of long large cross-section underground structure is derived with the comprehensive consideration of internal and external damping, effects of shear, cross-sectional rotational inertia and axial force, and a twoparameter soil model. In this way, Timoshenko＇s beam theory is extended. Two limit cases of free transverse vibration of underground structures are discussed. Parameter study shows that in general wave propagation velocities in structures increase with soil elastic parameters. However the influence of Winkler＇s parameter k is significant while the effect of the second soil elastic parameter gp is insignificant. The free vibration frequency of underground structures increases with relative wave number and soil elastic parameters. Unlike the influence of soil elastic parameters on wave propagation velocities, the influence of soil elastic parameters k and gp on the vibration frequency of underground structures have the same order; therefore the influence of the second soil parameter gp on the free vibration of underground structures should not be neglected in dynamic seismic analysis of underground structures

倍频器、分频器、混频器、变频器、移相器

Y2001-62877-170 0120754—8通道采样速率36G/秒 CMOS 定时分析仪=Aneight channel 36G sample/s CMOS timing analyzer[会.英]/Weinlader,D.& Ho,R//2000 IEEE Interna-tional Solid-State Circuits Conference,Digest.—170～171(EC)

Dynamic background modeling using tensor representation and ant colony optimization

Background modeling and subtraction is a fundamental problem in video analysis. Many algorithms have been developed to date, but there are still some challenges in complex environments, especially dynamic scenes in which backgrounds are themselves moving, such as rippling water and swaying trees. In this paper, a novel background modeling method is proposed for dynamic scenes by combining both tensor representation and swarm intelligence. We maintain several video patches, which are naturally represented as higher order tensors,to represent the patterns of background, and utilize tensor low-rank approximation to capture the dynamic nature. Furthermore, we introduce an ant colony algorithm to improve the performance. Experimental results show that the proposed method is robust and adaptive in dynamic environments, and moving objects can be perfectly separated from the complex dynamic background.

An ultra-accurate dynamic isogeometric analysis with higher order mass formulation

An ultra-accurate isogeometric dynamic analysis is presented.The key ingredient of the proposed methodology is the development of isogeometric higher order mass matrix.A new one-step method is proposed for the construction of higher order mass matrix.In this approach,an adjustable mass matrix is formulated through introducing a set of mass parameters into the consistent mass matrix under the element mass conservation condition.Then the semi-discrete frequency derived from the free vibration equation with the adjustable mass matrix is served as a measure to optimize the mass parameters.In 1D analysis,it turns out that the present one-step method can perfectly recover the existing reduced bandwidth mass matrix and the higher order mass matrix by choosing different mass parameters.However,the employment of the proposed one-step method to the2D membrane problem yields a remarkable gain of solution accuracy compared with the higher order mass matrix generated by the original two-step method.Subsequently a full-discrete isogeometric transient analysis algorithm is presented by using the Newmark time integration scheme and the higher order mass matrix.The full-discrete frequency is derived to assess the accuracy of space-time discretization.Finally a set of numerical examples are presented to evaluate the accuracy of the proposed method,which show that very favorable solution accuracy is achieved by the present dynamic isogeometric analysis with higher order mass formulation compared with that obtained from the standard consistent mass approach.