便携式医疗监护系统中信号调理模块的设计

从微功耗、微型化设计的角度出发,结合便携式医疗监护系统的总体设计思路和系统中信号调理模块的设计要求,详细阐述了信号放大电路、滤波电路等的设计思路和具体实现方法。该方法能较好地实现人体生理微小信号的不失真放大,为便携式系统提供了较高精度信号调理模块的解决方案。     

压电式能量获取装置的研究现状

微机电系统(MEMS)将是21世纪最重要的研究领域之一,而微能源器件是MEMS其中一个重要分支,其发展直接关系到MEMS在某些领域中的应用。现针对压电式能源获取装置在国际上的研究进展进行系统的阐述和介绍,以压电效应的本质特征为基础,详细描述了它的结构、原理和应用领域。     

集中抄表双模通信系统的设计

集抄系统正在逐步实现从载波通信向微功率无线通信的过渡,但2种通信方式各有利弊。文章介绍了一种用于集中抄表的双模通信系统的硬件设计方案,该方案集中器本地模块以ATMEL9260为核心芯片,智能电表的通信模块采用MSP430F5172为控制芯片,相互交互的载波通信采用青岛东软公司的载波芯片,微功率无线通信采用TI公司的无线射频收发芯片CC1100。双模通信方式自动尝试切换,实验及现场应用证明,双模通信系统较好地解决了当前集抄成功率低的问题。     

High Voltage MOSFET Gate/Bulk Driver Controller for a Microbattery Switch Matrix in a 0.35 μ m Microwave SOI Technology

Integrated microbatteries are being currently developed to act as a “micropower” source in microsatellites. The current and voltage rating of the microbattery is fixed. Certain highly miniaturized systems require higher voltages and currents. A switching matrix is designed to achieve the same. The switching matrix is designed using High Voltage Metal Oxide Semiconductor (MOS) structures and bulk isolated H gate transistors. This paper presents a design approach to help attain any random grouping pattern between the microbatteries. In this case, the result is an ability to charge microbatteries in parallel and to discharge microbatteries in parallel or pairs of microbatteries in series. This is achieved by providing the appropriate gate/bulk voltages to the matrix. High Voltage MOS structures are developed which can take higher drain-to-source voltages in a 3.3 V process. The designs are built using Microwave Silicon-on-Insulator process. Vinesh Sukumar received the B.E. degree in Electronics and Instrumentation Engineering from Nagarjuna University, Bapatla, India in 2000. He received his M.S. degree in Electrical and Electronics Engineering in 2003 from University of Idaho, Moscow, ID. He is presently pursuing his Doctoral degree in Electrical Engineering at University of Idaho, Moscow, ID. His research interests include Radiation Hard Analog Design and Integrated Power Electronics.     

微能源

微电子机械系统 (MEMS———MicroElectroMechanicalSystems) ,是指运用微电子加工技术和微机械加工技术 ,在较小的物理尺寸上 ,集成了微机械元件 ,微传感器 ,微机械执行器 ,微电子元件、电路和供能部件的器件或是系统。目前供能问题已经成为MEMS降低成本、进入实用化、自动化的最大障碍。现有的一个解决方案是微能源。介绍了微能源技术的发展和技术现状 ,分别讨论了微型内燃机系统、微燃料电池、微太阳电池、微型锂电池、微型核电池等几种微能源的制造工艺 ,工作特性以及应用现状。简单分析了微能源的发展方向和应用前景。     

基于模型预测的微电源逆变器控制

微电源逆变器的传统控制方法具有设计复杂、鲁棒性低等缺点,为了提高微电源逆变器的快速准确响应,提出将模型预测控制(model predictive control,MPC)引入逆变器。根据逆变器并网孤岛状态运行需求,设计了模型预测PQ控制方案和基于下垂特性的U/f模型预测控制方案,通过LC滤波器中电感和电容建立微分方程,推导出相应的数学预测模型,在并网运行时,控制逆变器输出电流跟踪由功率指令生成的参考电流;在孤岛运行时,控制逆变器跟踪功率控制器生成参考电压和频率。仿真表明,2种控制方案都实现了有效跟踪,并且相比于传统PI控制,系统响应速度快、超调小控制精度高。仿真证明了控制策略的可行性,使逆变系统达到了良好的控制效果。     

一种基于微功率网络的农村智能漏电流预警系统

由于各种原因,农村漏电流保护器投运率一直很低.本文介绍了一种基于微功率网络的漏电流预警系统,对系统的构架,主要硬件设备,主站功能等3个方面对漏电流预警系统做了论述,实现了农村用户漏保及台区总保的漏电流值和状态的整点监控,填补了农村漏电流集中管理的空白,提高了漏电流保护器的投运率.     

一种适合芯片技术的语音特征提取电路

设计一种便于芯片技术实现、结构简单的语音特征提取电路. 它由带通滤波器组、整流电路和低通滤波器构成.同时,借此电路阐述一种充分利用器件特性设计电路的思想. 这种思想以完成功能为目的，不以完成算法为目标. 据此建立的数学模型可能很复杂，但电路结构简单，便于芯片实现，芯片资源利用率高. 对实际语音信号进行SPICE模拟结果初步表明，此电路可以得到与线性系统类似的语音特征.     

Settling Analysis of MOS Regulated Current Mirrors Applied to Micropower D/A Converters

This paper provides an insight to the trade-off between settling time and power consumption in regulated current mirrors as building parts in micropower current-switching D/A converters. The regulation-loop frequency characteristic is obtained and difficulties to impose a dominant-pole condition to the resulting 2nd-order system are evaluated. Raising pole frequencies in micropower circuits, while meeting consumption requirements, is basically limited by parasitic capacitances. For such cases, an alternative is to impose a twin-pole condition in which design constraints are somewhat relieved and settling slightly improved. Relationships between pole frequencies, transistor geometry and bias are established and design guidelines for regulated current mirrors founded. By placing loop-transistors in either weak or strong inversion, small (W/L) ratios are allowed and stray capacitances reduced. Simulated waveforms suggest a good agreement with theory. The proposed approach applied to the design of a micropower current-mode D/A converter improves both simulated and experimental settling performance.     

HAC-μP微功率无线模块在数据采集中的应用

介绍了HACμ-P微功率无线模块的功能及特点,并通过一个数据采集终端应用实例阐述了HACμ-P微功率无线模块在数据采集系统中的应用原理及软硬件设计方法,文中还给出了终端的通信接口电路以及数据通信程序,具有一定的实用价值。