共查询到20条相似文献,搜索用时 62 毫秒
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设计实现了一种具有高增益大带宽的全差分增益自举运算放大器,适用于高速高精度流水线模数转换器采保电路的应用.增益自举放大器的主放大器和子放大器均采用折叠共源共栅式全差分结构,并且主放大器采用开关电容共模反馈来稳定输出电压.该放大器工作在3.0 V电源电压下,单端负载为2pF,采用0.18Wn CMOS工艺库对电路进行仿真,结果显示该放大器的直流增益可达到112dB,单位增益带宽为1.17GHz. 相似文献
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一种高性能运算放大器的设计 总被引:4,自引:7,他引:4
应用0.35μm工艺,在10mw功耗下设计了一个放大倍数为124db、单位增益带宽为233MHz(负载为2pF)的全差分运算放大器,可以同时满足一定的高速、高精度指标.其中,高的直流电压增益通过两级的cascode结构提高运放的输出电阻得到,同时,采用两个全差分运算放大器替代传统的四个单端运算放大器作为增益自举结构,而增益自举运放的共模反馈利用单MOS管来实现.仿真表明,这种新型结构的全差分运算放大器在面积、功耗以及建立时间上都优于传统的运算放大器. 相似文献
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设计了一种新颖的全差分的CMOS运算放大器.在全部晶体管都取最小沟道长度的情况下,层叠的负电阻晶体管结构来提高增益.在电源电压为2.5V, 0.25 μm CMOS工艺条件下进行电路模拟.模拟结果表明, 开环直流增益为86 dB,单位增益带宽为200 MHz,相位裕度为80°. 相似文献
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The avalanche modo characteristics of bipolar transistors are considered. A theoretical analysis based on an extension to the Ebers-Moll transistor model is shown to provide satisfactory agreement with various experimental results in the avalanche mode. 相似文献
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Y. Bruck 《International Journal of Electronics》2013,100(5):441-456
The prominent inventions of D.E. Norton as well as other similar schematics are widely used in different circuits of amplifiers and mixers. However, the use of these circuits in high-frequency integrated circuits (IC) is still hindered by the presence of the broadband feedback transformer. We propose new configuration schematics of transformer-less amplifiers with similar properties. Now we understand implicitly that this opportunity was already contained in our previous patents and papers. Here, the generalised circuit of an amplifier with a complex positive current feedback and with a common base (CB) transistor configuration is considered. Besides, the circuit of low noise amplifier (LNA) with a resistive positive feedback (RPF) is investigated in detail. RPF and CB amplifiers are compared. It is demonstrated that LNA RPF provides gain stability vs scattering of parameters, a good level of the input and output matching, a wider frequency band and the noise temperature more than twice as low as that in CB and, despite a positive feedback, it provides a high stability gain. 相似文献
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Donald T. Comer 《Analog Integrated Circuits and Signal Processing》1996,11(3):243-251
Circuits which achieve precise gains without the use of negative feedback are of interest because of their simplicity and potential for achieving large bandwidths. A circuit architecture based upon precision current mirrors for producing fixed gains without the use of feedback has been reported in the literature and implemented on a BiCMOS process [1]. This paper provides further analysis of this approach and applies it to a new bipolar amplifier, intended for such applications as real-time active filter synthesis. 相似文献
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D类数字功率放大器电路失真分析及其负反馈方案讨论 总被引:3,自引:0,他引:3
本文采用Bennett方法^[1]对D类数字功率放大电路进行失真分析,在此基础上讨论了用负反馈设计来降低失真的可行性方案。以一个10-W放大器为实例,分析仿真结果表明:THD为0.03-0.6%,能量转换效率达89%。 相似文献
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宽带、超宽带光纤放大器研究进展 总被引:2,自引:0,他引:2
目前,实现宽带、超宽带光纤放大器的技术主要有四种:宽带掺铒光纤放大(EDFA)技术、宽带拉曼放大技术、宽带混合放大技术和光纤参量放大技术.综述了宽带和超宽带光纤放大器的研究现状,并分别分析了其特点及发展趋势. 相似文献
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采用分布电路原理、CAD技术和微带电路技术,制作出多倍频程超宽带放大器。其主要技术参数为,f=2~18GHz,G_p≥30dB,△G_p≤±3dB,F_n≤7dBm,P_(-1)≥+10dB,VSWR≤2.5:1。 相似文献
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针对有线电视网双向改造的需要,设计了一种电路简洁、性能优良、成本低廉的双向放大器。详细介绍了电路的工作原理、元件选择、指标测试、使用维护等。 相似文献