共查询到20条相似文献,搜索用时 78 毫秒
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介绍了一种采用0.6μm CMOS工艺设计的高增益两级运放结构。结构主要采用基本的两级运放结构,并采用增益提高技术提高放大器的增益。用SmartSpice软件对电路进行了仿真,仿真结果表明,此电路能够将输入信号放大20000倍以上,单位增益带宽为13MHz,±2.5V电源供电,功耗小于1.4mW。 相似文献
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通过对传统两级单端运放结构的改进,设计了一种AB类输入和输出的全差分运放,在不损失增益的前提下提高了带宽和压摆率。本运放基于JAZZ 0.18μm CMOS工艺进行设计,为了保证设计的鲁棒性,仿真覆盖了全工艺角,结果表明,在3.3 V 10%的电源电压、5 p F的大负载电容、-40~125℃温度条件下,此运放的直流开环增益大于80 d B,单位增益带宽大于170.74 MHz,转换速率大于150 V/μm,静态电流最大为5.8 m A。此运放的版图面积很小,仅为0.017 mm2,通过寄生参数的提取进行了后仿真,其结果和前仿真结果拟合得很好。 相似文献
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一种高增益宽频带的增益自举运算放大器 总被引:1,自引:0,他引:1
设计了一个应用于高精度流水线结构ADC中的高增益、宽频带全差分运算跨导放大器(OTA).整体运放采用了2级结构,第一级采用套筒共源共栅结构,并结合增益自举技术来提高增益;第二级采用共源放大器结构作为输出级,以增大运放的输出信号摆幅.该设计采用UMC 0.18μm CMOS工艺,版图面积为320μm×260μm.仿真结果显示:在1.8 V电源供电5 pF负载下,在各个工艺角及温度变化下增益高于120 dB,增益带宽积(GBW)大于800 MHz,而整个运放消耗16.36 mA的电流,FOM值为306 MHz·pF/mA. 相似文献
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设计了一种用于高速ADC中的高速高增益的全差分CMOS运算放大器。主运放采用带开关电容共模反馈的折叠式共源共栅结构,利用增益提高和三支路电流基准技术实现一个可用于12~14 bit精度,100 MS/s采样频率的高速流水线(Pipelined)ADC的运放。设计基于SMIC 0.25μm CMOS工艺,在Cadence环境下对电路进行Spectre仿真。仿真结果表明,在2.5 V单电源电压下驱动2 pF负载时,运放的直流增益可达到124 dB,单位增益带宽720 MHz,转换速率高达885 V/μs,达到0.1%的稳定精度的建立时间只需4 ns,共模抑制比153 dB。 相似文献
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一种适用于传感器信号检测的斩波运算放大器 总被引:1,自引:0,他引:1
提出一种适合传感器微弱信号检测应用的全差分低噪声、低失调斩波运算放大器。采用两级折叠共源共栅运放结构,基于斩波稳定及动态元件匹配技术,通过在运放低阻节点的电流通路上添加斩波开关的设计方式,增加了运放的输入信号带宽和输出电压摆幅。芯片采用TSMC 0.18μm 1P6MCMOS工艺实现。测试结果表明,在1.8V电源电压,25kHz输入信号和300kHz斩波频率下,斩波运放输入等效失调电压小于120μV,在10Hz~1kHz之间,输入等效噪声为5nV/Hz1/2,最高开环增益为84dB,单位增益带宽为4MHz。 相似文献
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为了提高增益自举OTA的电流效率,对主运放、辅助运放及其共模反馈电路进行了电流复用,在华宏0.35μm工艺5 V电源电压下实现了一种具有大DC增益(大于121 dB)、高电流效率(大于1 146 MHz*pF/mA)、宽差分输出动态范围(大于9 V)的OTA结构. 相似文献
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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
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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
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《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
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By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film
element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental
researches of large-scale models are represented. 相似文献
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Moshrefzadeh R.S. Radcliffe M.D. Lee T.C. Mohapatra S.K. 《Lightwave Technology, Journal of》1992,10(4):420-425
The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in N TE-N TM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced 相似文献
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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
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“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