共查询到20条相似文献,搜索用时 281 毫秒
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Sub-1V CMOS Voltage Reference Based on Weighted Vgs 总被引:1,自引:1,他引:0
提出了一种新型CMOS恒压源的制作方案,它基于nMOS和pMOS的饱和区栅源电压随温度变化权重不同的原理,将两者做相关运算,得到零温度系数的恒压源.该电压源没有采用二极管和寄生三极管,并用SMIC 0.18μm数模混合工艺模型参数仿真并制造.测试结果表明,温度系数达到了44ppm/℃,PSRR为-46dB,650mV以上的电源电压就可以完全正常工作.芯片面积约为0.05mm2. 相似文献
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提出了一种新颖的带有数字控制的带隙基准电压源,此带隙基准电压源通过控制PNP晶体管的导通来实现可调的输出参考电压和可调的温度系数.此电路通过数字信号控制获得了一组不同的温度曲线,从这组温度曲线中,可以得到精确的输出参考电压和非常好的温度特性曲线.数字控制型带隙基准电压源的输出电压误差可以控制在±4 mV以内,最好的温度系数可以达到8.3×10-6/℃(温度从-40~80℃变化时),在电源电压从1.5~3.3 V变化时输出参考电压仅变化1 mV.所设计的带隙基准电压源,采用SMIC 0.18 μm CMOS工艺流片实现,面积为0.09 mm2. 相似文献
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电流叠加型CMOS基准电压源 总被引:4,自引:0,他引:4
介绍了一种CMOS基准电压源,该电路由NMOS管阈值电压的温度系数及NMOS管迁移率温度系数形成温度补偿,产生低温度系数的基准电压。与传统的带隙基准比较而言,不需要三极管;另外,通过结构的改进,变成正负温度系数电流叠加型的基准电压源,可以按需要任意调节输出基准电压的值,而且可以同时提供多个基准电压。电流叠加型基准电压源电路已经在3μmCMOS工艺线上实现,基准电压源输出中心值在2.2 V左右,温度系数为80 ppm/℃。 相似文献
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基于斩波运算放大器的曲率补偿CMOS带隙电压基准源电路,采用了折叠式的一阶放大器,较二阶结构线路简单,功耗低,版图面积小,并能很好地满足增益要求.采用二阶电流补偿进行曲率补偿,使带隙电压基准源能达到更好的温度系数,且系统稳定.应用0.5μm CMOS Spice模型进行了运算放大器和带隙电压基准源的电路仿真,输出电压为1.17V,在-20℃至120℃温度下,温度系数为4.7ppm/℃.该基准电压可根据工艺和内部电阻元件选取的不同获得不同电压值,其温度范围能够满足实际工作环境的需要. 相似文献
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这篇文章提出了一种低电源电压高温度稳定性的带隙基准源.这种基准源主要思路是将输出基准电压反馈回曲率补偿回路,从而建立了一个闭环反馈回路.在这个闭环回路中,一方面,输出电压的温度系数越低,补偿电路就可以产生更准确地补偿电流,从而更加完全的抵消掉具有温度依赖的对数项;另一方面,如果补偿电路将对数项抵消得更彻底,输出电压的温度系数就会更低,这就形成了一种静态的正反馈.因而通过不断的调节补偿电阻,可以完全抵消掉对数项,实现高温度稳定性的基准源.同时利用电平移位技术为基准源设计了一个适合低电压工作的运算放大器.基于标准的0.18μmCMOS工艺设计了一种基准源电路.仿真结果表明这种基准源可以工作在电源电压从0.8V到1.8V,输出基准电压Vref的电压偏差只有0.87mV/V,在-20到80度温度范围内,Vref的温度系数为0.63ppm/oC. 相似文献
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电压基准在模拟电路中提供一个受电源或温度等影响较小的参考电压,以保证整个电路正常工作.设计了一种低温漂低功耗带隙基准电压源,采用不受电源影响的串联电流镜做偏置,利用PTAT电压的正向温度系数和基极发射极电压的负向温度系数特性,以适当的系数加权构造零温度系数的电压量.该设计避开了运放的应用,结构简易,原理清晰,便于入门级的同学在短时间内学习掌握.0~70℃范围内,温漂系数为16.4 ppm/℃.供电电压在5~6V 范围内变化时,电源抑制比达57.7 dB.总输出噪声为140.3 μV,功耗为300.6 μW. 相似文献
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《Microelectronics Journal》2014,45(8):1087-1092
The driving capability of a single-electron transistor (SET) circuit is sensitive to the load and interconnects. We discuss about improving the performance of a SET logic in hybrid SET–CMOS circuit by parameter variation and circuit architecture along with its simulation results. With an intention of studying the SET logic drivability in a SET-only circuit, we examined a circuit composed of 213 SET inverters with its interconnect effect in a 3-D CMOS IC. The schematic of the simulation is based on fabrication model of this large circuit along with interlayer and coupling capacitances of its metallization. The simulation results for delay, bandwidth and power validate the efficiency of a SET circuit. 相似文献
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HgCdTe光导探测器的一种恒流偏置低噪声放大电路的设计 总被引:1,自引:0,他引:1
在多元光导探测器的工程应用中,串音是影响系统性能的一个重要因素。其中,由公共地线电阻引入的电子学串音可以通过提高偏置电阻来抑制。本文从HgCdTe光导探测器的工作特性出发,设计了等效内阻很高的恒流偏置低噪声前置放大电路。对电路的工作原理和噪声性能进行了分析和讨论,给出了电路的噪声模型,导出了电路的等效输入噪声表达式,并进行了电路实现和低噪声性能测试。 相似文献
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A new active pull-down emitter-coupled logic (ECL) circuit having full compensation against fluctuations in supply voltage and temperature is proposed. This circuit needs no capacitors but a feed-back circuit to adjust its pull-down capability to its load capacitance. The speed performance is compared between the active pull-down ECL circuit and the conventional ECL circuit using 0.8 μm SPICE parameters. The active pull-down ECL circuit is twice as fast as the conventional ECL circuit under the load capacitance of 0.8 pF with the same power dissipation. The relation between the power dissipation and the operating frequency is compared among the CMOS, the conventional ECL, and the active pull-down ECL circuits. The comparison adapts a new method in which the circuit parameters are optimized at each operating frequency. The SPICE simulation using this new method shows the conventional ECL circuit has a lower power dissipation than the CMOS circuit, even in the low operating frequency region of 100 MHz. The new active pull-down ECL circuit has the lowest power dissipation among the three circuits. The power dissipation of this circuit shows 47% lower than the CMOS circuit and 29% lower than the conventional ECL circuit at the operating frequency of 600 MHz and the load capacitance of 0.8 pF 相似文献
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L6598高压谐振控制器及应用 总被引:2,自引:0,他引:2
L6598是将谐振变换控制电路与高压半桥驱动器结合在一起的单片IC,它适用于AC/DC适配器和需要谐振拓扑结构的场合,在应用中其外部所需的元件极少。文中介绍了L6598内部结构、引脚功能、单元电路工作原理及其在宽范围AC/DC适配器中的应用电路。 相似文献
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Proposed is a discrete switch-mode fly-back power supply that combines part of its resonance topology into its switch-mode transformer (SMT). The resonant action is generated by the snubber circuit, and an expensive tank circuit is avoided. The "minimum switch on" circuit from the proposed SMT primary and lower auxiliary winding is designed in such a way that it provides a delay of half-resonant cycle before the driver circuit switches on the biasing circuit. This paper presents some practical design aspects of a series of SMTs intended to be used in developed and developing countries where the ac mains voltage is expected to fluctuate from very narrow to wide ranges, respectively. 相似文献
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电子电路是由具有特定功能的电子元器件组合成的,在电子电路中每个元器件都具备自己特定的作用。一旦某个元件发生损坏,电子电路的功能一定会受到影响,发生变化。这种电路系统丧失规定的功能的现象就被称之为电路故障。本文通过电子电路故障类型的分类着手,进而分析了电子电路故障诊断的基本技术,接着阐述了模拟电路诊断的方法,进而了解了数字电路故障测试的基本技术。希望这一项研究对今后这一课题的研究有借鉴价值和参考作用。 相似文献
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Equivalent circuit models for resonant and PWM switches 总被引:4,自引:0,他引:4
The nonlinear switching mechanism in pulsewidth-modulated (PWM) and quasi-resonant converters is that of a three-terminal switching device which consists only of an active and a passive switch. An equivalent circuit model of this switching device describing the perturbations in the average terminal voltages and current is obtained. Through the use of this circuit model the analysis of pulsewidth modulated and quasiresonant converters becomes analogous to transistor circuit analysis where the transistor is replaced by its equivalent circuit model. The conversion ratio characteristics of various resonant converters and their relationship to a single function, called the quasi-resonant function, is easily obtained using the circuit model for the three-terminal switching device. The small-signal response of quasi-resonant converters to perturbations in the switching frequency and input voltage is determined by replacing the three-terminal switching device by its small-signal equivalent circuit model 相似文献
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设计了接触式印刷电路板检测系统,利用3个轴的步进电机驱动针头运动,对印刷电路板的电子线路的质量进行检测,并对其原理和具体的实现作了分析.通过实际应用证明,弥补了其他方案的不足,提高了检测效率. 相似文献