一种应用于模拟卫星电视调谐器的单端晶体OSC

介绍了一种应用于模拟卫星电视调谐器的单端晶体OSC实现方法,本结构所有负载电容都集成在片内,片外只需连接晶体的单个管脚,片内所有电容都由MOS管栅电容实现,从而大大减小了芯片的面积,在0.18μm1P6MCMOS工艺下,整体版图面积只有0.023mm2.电路可实现外接晶体模式或外接激励模式自由切换,外接晶体时可在2-10M晶体下正常工作,振荡稳定产生轨到轨正弦波形,起振时间在1ms内,外接激励模式下可满足0.1～3.3V的正弦波输入.     

Neural oscillator based control for pathological tremor suppression via functional electrical stimulation

This paper explores the possibility to adopt neural oscillators for pathological tremor attenuation. The objective is to suppress the tremor of a single joint of upper limb via functional electrical stimulation (FES). A biologically inspired neural oscillator is developed, which generates the anti-tremor rhythmic stimulation patterns to stimulate a pair of antagonist muscles. Surface electromyographic (EMG) signal is used to entrain the neural oscillator reciprocally and shape the stimulation pattern adaptively. The neural oscillator serves as an adaptive feedforward controller, which is combined with a feedback regulator. Simulation study is performed on musculoskeletal models of wrist joint and elbow joint separately, and some promising results are presented.     

A direct digital frequency synthesizer based on ROM free algorithm

An ROM free quadrature direct digital frequency synthesizer (DDFS) was proposed in this paper. The proposed DDFS mainly consists of two adders and two multipliers to generate quadrature outputs. The proposed DDFS was implemented in both cell-base library and ALTERA Stratix EP1S40F780C5 FPGA board for verification.     

Differential precisely controllable piezoresonant absolute pressure transducer with a manifold increase in sensitivity

A new system is developed for a multiple increase change in the output of transducer frequency that leads to an increase in its sensitivity. The system does not disturb the vacuum and it makes it possible to perform precise micrometric control of absolute pressure. Deceased. __________ Translated from Izmeritel’naya Tekhnika, No. 12, pp. 34–37, December, 2005.     

Emotion as a Thermostat: Representing Emotion Regulation Using a Damped Oscillator Model.

The authors present in this study a damped oscillator model that provides a direct mathematical basis for testing the notion of emotion as a self-regulatory thermostat. Parameters from this model reflect individual differences in emotional lability and the ability to regulate emotion. The authors discuss concepts such as intensity, rate of change, and acceleration in the context of emotion, and they illustrate the strengths of this approach in comparison with spectral analysis and growth curve models. The utility of this modeling approach is illustrated using daily emotion ratings from 179 college students over 52 consecutive days. Overall, the damped oscillator model provides a meaningful way of representing emotion regulation as a dynamic process and helps identify the dominant periodicities in individuals' emotions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

带温度与工艺补偿的新型振荡器

设计了一种能够对温度和工艺进行补偿的振荡器电路,无外部器件连接,芯片采用自补偿技术对温度和工艺进行检测并校准,而不需要额外的修调。使用0.18μm CMOS工艺,工作温度变化范围为-30～70℃,输出频率最大偏差为2%,芯片面积为0.12mm2。电源电压为3.3V,室温正常工作时功耗为165μW。     

转换电容滤波器时钟信号的产生

提出转换电容滤波器时钟信号产生的解决方案。     

基于FPGA的全场景试验系统主时钟终端频率校准方法

针对全场景试验系统主时钟终端的时钟源频率精度低和稳定性不足的问题,文中提出了一种简单有效的恒温晶振校准方法。该方法基于FPGA时间系统建立的原理,通过TDC(时间数字转换器)测得的恒温晶振与GPS秒脉冲之间的周期偏差值,修改FPGA内部计数器的周期计数值,达到校准主时钟频率的目的。为降低GPS信号抖动的影响,采用滑动平均滤波算法,实现恒温晶振的快速驯服。通过仿真和试验测试,驯服后主时钟平均频率精度高于5×10-10,守时精度优于1.8μ/h。     

Enhanced entanglement in a non-degenerate four-level atom with a parametric oscillator

We discuss the generation and evolution of a macroscopic entanglement light with a subthreshold non-degenerate parametric oscillator, coupled to a vacuum reservoir. The four-level atoms driven by two classical fields interact with the parametric oscillator. The master equation for the cavity modes of the scheme is derived and analyzed, the entanglement properties of the two-mode light generated by this scheme inside and outside the cavity is studied. We show that the light produced by this system is strongly entangled with time evolution inside and outside a cavity.