共查询到19条相似文献,搜索用时 562 毫秒
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数字电视发射机中功率放大器的设计 总被引:1,自引:0,他引:1
用最新的LDMOSFET器件,采用平衡放大电路结构熏设计数字电视发射机中的功率放大器。工作频段在470MHz~860MHz,整个频带内增益在12dB左右,工作在线性状态,交调抑制小于-35dB。 相似文献
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采用Cree公司提供的CGH40010F GaN高电子迁移率晶体管(HEM T)作为有源器件,设计了一款工作在2.2 G Hz的射频功率放大器.利用ADS软件对功率管的偏置电路进行设计的仿真,利用阶跃式匹配方法扩展了带宽,通过对功率管寄生参数的仿真,有效地提高了功率附加效率(PA E).仿真结果表明,在2.1 GHz~2.3 GHz的频率范围内,小信号S21增益为12.03 dB~12.77 dB,大信号输出功率为40.17 dBm,功率附加效率达到61.3%.达到设计指标的要求. 相似文献
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一种0.8GHz~6GHz CMOS超宽带低噪声放大器设计 总被引:1,自引:0,他引:1
给出了一个针对0.8GHz~6GHz 的超宽带低噪声放大器 UWB LNA(ultra-wideband low noiseamplifier)设计。设计采用0.18μm RF CMOS 工艺完成。在0.8GHz~6GHz 的频段内,放大器增益 S21达到了17.6dB~13.6dB。输入、输出均实现良好的阻抗匹配,S11、S22均低于-10dB。噪声系数(NF)为2.7dB~4.6dB。在1.8V 工作电压下放大器的直流功耗约为12mW。 相似文献
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针对轨道交通运营安全保障需求,本文阐述了一种以临近空间浮空器为中心的空天车地立体环境下的宽带传输系统设计方案,在分析主要技术指标要求的基础上,给出了主要工作参数设计思路,并重点论述了S频段宽带网络收发器和S频段功率放大器设计方案,并在最后给出了验证方法和实测结果,结果表明本文所述方案满足系统指标要求。 相似文献
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《电子技术应用》2016,(5):39-41
设计了一个工作频率高达20 GHz、最高输出功率23.4 dBm的CMOS功率放大器(PA),该PA由两级放大器组成,采用全差分Cascode电路结构。PA的输入、级间、输出匹配网络均采用片上变压器实现,实现单端输入、单端输出,功率合成器用来提高PA的输出信号摆幅。该PA基于TSMC 0.18μm CMOS工艺模型进行设计,采用Agilent ADS软件进行PA性能仿真和片上变压器的设计,版图仿真结果表明:在20 GHz频段内,PA的输入、输出完全匹配(S11=-13.85 dB、S22=-10.94 d B),小信号增益S21达到21.5 dB,芯片面积仅为0.56 mm~2。 相似文献
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Ramkrishna Kundu Abhishek Pandey Subhra Chakraborty Vijay Nath 《Microsystem Technologies》2016,22(11):2707-2714
In this paper a 2.45 GHz narrowband low noise amplifier (LNA) for wireless communication system is enunciated. The proposed CMOS Low Noise amplifier has been verified through cadence spectre RF simulation in standard UMC 90 nm CMOS process. The proposed LNA is designed by cascoding of two transistors; that is the common source transistor drives a common gate transistor. To achieve better power gain along with low noise figure, cascoding of two transistor and source degeneration technique is used and for low power consumption, the MOS transistors are biased in subthreshold region. At 2.45 GHz frequency, it exhibits power gain 31.53 dB. The S11, S22 and S12 of the circuit is ?9.14, ?9.22 and ?38.03 dB respectively. The 1 dB compression point of the circuit is ?16.89 dBm and IIP3 is ?5.70 dBm. The noise figure is 2.34 dB, input/output match of ?9.14 dB/?9.22 dB and power consumption 8.5 mW at 1.2 V. 相似文献
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为了更准确地描述带有记忆效应的射频(RF)功放特性,基于传统的动态X参数模型,结合功放长期记忆效应以及短期记忆效应机理,提出一种新型动态X参数功放建模方法。新模型保留X参数模型的静态核函数,利用双记忆路径模型提取出表征记忆效应的非线性函数,替换动态核函数。采用输出信号为幅度与频率双变量的新型反馈(FB)结构,引入时变频率变量而简化动态核函数为二维核函数。使用MW6S010N设计功放并建模,由仿真可知,新模型在单音大信号及码分多址(CDMA)信号激励下,均能正确表征功放特性,归一化均方误差(NMSE)较静态X参数模型、传统动态X参数模型以及前馈(FF)结构X参数模型分别减少8.0 dB、6.3 dB、2.5 dB。结果表明该模型能够更加准确拟合带有非线性记忆效应功率放大器的特性。 相似文献
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A common‐drain power amplifier (PA) for envelope tracking systems is presented. In envelope tracking, the main PA operates mostly in compression and the power supply rejection ratio (PSRR) is not high. Furthermore, the output noise of the supply modulator can be mixed with the RF signal and generates out‐of‐band emissions. In this article, instead of using a common‐source topology, the PSRR of the envelope tracking PA is inherently improved by utilizing a common‐drain topology. A comprehensive analysis shows that the common‐drain topology is less sensitive to the supply noise, as compared to the conventional common‐source topology. The proposed common‐drain PA is implemented using a discrete LDMOS PD20010‐E RF transistor. Measurement results show that the PSRR of the proposed common‐drain PA is improved by up to 7 dB as compared to that of the common‐source PA. For a two‐tone input with 10 MHz bandwidth at the center frequency of 700 MHz, the power added efficiency (PAE) and IM3 of the envelope tracking common‐drain PA are 20% and ? 28 dBc, respectively, at an average output power of 33.4 dBm. The amplifier also shows a 12.4 dB power gain. Moreover, by utilizing the envelope tracking, the PAE is improved by more than 5%. 相似文献
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This article focused on 5.2 GHz highly integrated power amplifier for IEEE 802.11a WLAN application. Multiple‐gated transistor technique was used to improve linearity. A new approach for choosing the bias voltage of auxiliary transistor by analyzing the shift of gate bias is used in the design. The simulated results of the proposed two‐stage differential power amplifier indicate 25.28 dBm P1‐dB, 32.87% PAE, and 26.18 dBm saturated output power with a 5.2 dB P1‐dB improvement compared to conventional single transistor amplifier. © 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2011. 相似文献
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Karun Rawat Gowrish B Girish Ajmera Ananjan Basu Shiban K. Koul 《国际射频与微波计算机辅助工程杂志》2015,25(8):655-674
This article proposes a design strategy for broadband Doherty power amplifier (PA) using broadband load combiner. The bandwidth of the Doherty PA based on the proposed combiner using packaged transistor is about 2.5 times the bandwidth of conventional Doherty PA using a quarter‐wave transformer. An easy to implement analytical design methodology has been presented for the proposed load‐combiner while describing the bandwidth enhancement strategy. The design methodology is validated with the design of a broadband Doherty PA based on CREE 10 W packaged GaN high electron mobility transistor devices using the proposed load combiner. Measurement results show more than 45% drain efficiency at 6 dB output power back‐off (OPBO) over 400 MHz frequency range, centred around 1.95 GHz. The peak drain efficiency at saturation is better than 60% over this band of operation. At 6 dB OPBO, the maximum improvement of 18.5% in drain efficiency is achieved as compared to the balanced mode PA. Measurement with single carrier wideband code division multiple access modulated signal shows the average drain efficiency of more than 44% at 36.6 dBm average output power at center frequency of operation. The adjacent channel power ratio is better than ?45 dBc after applying digital predistortion. The circuit is realized with microstrip technology, which can be easily fabricated using conventional printed circuit processes. © 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:655–674, 2015. 相似文献
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为满足3.5 GHz单载波超宽带无线接收机的射频需求,设计了一种工作在3~4 GHz的超宽带低噪声放大器。电路采用差分输入的CMOS共栅级结构,利用MOS管跨导实现宽带输入匹配,利用电容交叉耦合结构和噪声消除技术降低噪声系数,同时提高电压增益。分析了该电路的设计原理和噪声系数,并在基于SMIC 0.18μm CMOS射频工艺进行了设计仿真。仿真结果表明:在3~4GHz频段内,S11和S22均小于-10 dB,S21大于14dB,带内起伏小于0.5dB,噪声系数小于3dB;1.8V电源电压下,静态功耗7.8mW。满足超宽带无线接收机技术指标。 相似文献