共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
分析与设计了一种工作电源在0.6V~3.3V之间、超低功耗的跨导运算放大器(OTA)。整体电路基于工作在弱反型区的衬底驱动输入差分对和电平移位电路,且供电电压可低于晶体管PMOS的阈值电压。OTA电路采用HJTC0.35μm N阱CMOS工艺,Hspice仿真结果表明,在工作电压为0.6V时,功耗仅为326nW。 相似文献
4.
5.
衬底驱动超低压CMOS带隙基准电压源 总被引:2,自引:2,他引:0
采用二阶温度补偿和电流反馈技术,设计实现了一种基于衬底驱动技术和电阻分压技术的超低压CMOS带隙基准电压源。采用衬底驱动超低压运算放大器作为基准源的负反馈,使其输出用于产生自身的电流源偏置,其电源抑制比(PSRR)为-63.8dB。采用Hspice仿真,在0.9V电源电压下,输出基准电压为572.45mV,温度系数为13.3ppm/°C。在0.8~1.4V电源电压范围内,输出基准电压变化3.5mV。基于TSMC0.25μm2P5MCMOS工艺实现的衬底驱动带隙基准电压源的版图面积为203μm×478.1μm。 相似文献
6.
7.
8.
9.
Reza Moghimi 《电子设计技术》2005,12(11):110-110
由于多种原因.设计师们经常发现.他们的创新需要更多的电源电压。例如,一个由±2.5V电源供电的系统突然需要高精度的-1.4V基准,用于信号电平移位电路.并需要2.1V基准来驱动ADC。相应选择包括添加一对运算放大器和电阻器来使系统的电信号电平移位并缓冲,或添加几个DAC。运算放大器电路缺乏可编程能力来适应设计变化.并且,虽然DAC提供可编程能力,但它们的设定是易失性的.并且输出一般是单极性的,并缺乏驱动能力。 相似文献
10.
适合容性负载的高压大功率放大器 总被引:4,自引:1,他引:3
设计了一种适合压电陶瓷等容性负载的双极性可调高压大功率线性放大器,它由简单低廉的低压运算放大器、基于功率场效应管(MOSFET)的功率放大级组成主回路,通过电压负反馈构成闭环控制。对电路中各环节的特性进行了分析,并讨论了放大器的性能。该高压放大器在驱动等效电容为60nF的压电陶瓷时,单端到地输出电压为一600~ 600V,电压增益42dB,大信号带宽800Hz,小信号带宽7kHz,充放电电流可达200mA,静态电流可达1.4mA。实验与分析表明,高压直流放大器采用功率场效应管和电压闭环控制后,可拓展放大器通频带,提高放大器输出能力和长时间稳定性。 相似文献
11.
The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
12.
13.
解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
14.
15.
《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
16.
A. M. Emel’yanov 《Semiconductors》2010,44(9):1134-1139
A method for analyzing the luminescence spectra of semiconductors is suggested. The method is based on differentiation of
the spectra. The potentialities of the method are demonstrated for luminescence in the region of the fundamental absorption
edge of Si and SiGe alloy single crystals. The method is superior in accuracy to previously known luminescence methods of
determining the band gap of indirect-gap semiconductors and practically insensitive to different conditions of outputting
radiation from the sample. 相似文献
17.
“计算机组成原理”设计性实践教学模式研究 总被引:1,自引:0,他引:1
本文阐述了"计算机组成原理"设计性实验教学的重要性,对设计性实验教学的目的和基本特征进行了归纳,对"计算机组成原理"设计性实验教学的现状进行了调查,对存在的问题进行了较深入的分析;在此基础上.对组成原理设计性实验的教学模式进行了研究,对设计性实验的体系进行了初步设计,并对"计算机组成原理"设计性实验的实施方法进行了探讨. 相似文献