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首页> 外文期刊>Wireless personal communications: An Internaional Journal >A 3.1–10.6?GHz UWB LNA Based on Self Cascode Technique for Improved Bandwidth and High Gain
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A 3.1–10.6?GHz UWB LNA Based on Self Cascode Technique for Improved Bandwidth and High Gain

机译：3.1-10.6？GHz UWB LNA，基于自级级码技术，提高带宽和高增益

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摘要

In this work, we present a self cascode based ultra-wide band (UWB) low noise amplifier (LNA) with improved bandwidth and gain for 3.1–10.6?GHz wireless applications. The self cascode (SC) or split-length compensation technique is employed to improve the bandwidth and gain of the proposed LNA. The improvement in the bandwidth of SC based structure is around 1.22?GHz as compared to simple one. The significant enhancement in the characteristics of the introduced circuit is found without extra passive components. The SC based CS–CG structure in the proposed LNA uses the same DC current for operating first stage transistors. In the designed UWB LNA, a common source (CS) stage is used in the second stage to enhance the overall gain in the high frequency regime. With a standard 90?nm CMOS technology, the presented UWB LNA results in a gain $$hbox {S}_{21}$$ S 21 of $$20.10 pm 1.65,hbox {dB}$$ 20.10 ± 1.65 dB across the 3.1–10.6?GHz frequency range, and dissipating 11.52?mW power from a 1?V supply voltage. However, input reflection, $$hbox {S}_{11}$$ S 11 , lies below $$-,10$$ - 10 ?dB from 4.9–9.1?GHz frequency. Moreover, the output reflection ( $$hbox {S}_{22}$$ S 22 ) and reverse isolation ( $$hbox {S}_{12}$$ S 12 ), is below $$-,10$$ - 10 and $$-,48$$ - 48 ?dB, respectively for the ultra-wide band region. Apart from this, the minimum noise figure ( $$hbox {NF}_{min}$$ NF min ) value of the proposed UWB LNA exists in the range of 2.1–3?dB for 3.1–10.6?GHz frequency range with a a small variation of $$pm ,0.45,hbox {dB}$$ ± 0.45 dB in its $$hbox {NF}_{min}$$ NF min characteristics. Linearity of the designed LNA is analysed in terms of third order input intercept point (IIP3) whose value is $$-,4.22$$ - 4.22 ?dBm, when a two tone signal is applied at 6?GHz with a spacing of 10?MHz. The other important benefits of the proposed circuit are its group-delay variation and gain variation of $$pm ,115,hbox {ps}$$ ± 115 ps and $$pm ,1.65,hbox {dB}$$ ± 1.65 dB , respectively.
机译：在这项工作中，我们介绍了一种基于自助式的超宽带（UWB）低噪声放大器（LNA），具有改进的带宽和增益3.1-10.6？GHz无线应用。采用自级级码（SC）或分流长度补偿技术来改善所提出的LNA的带宽和增益。与简单的结构相比，基于SC基结构的带宽的提高约为1.22？GHz。在没有额外的无源部件的情况下发现引入电路的特性的显着增强。所提出的LNA中的SC基CS-CG结构使用相同的DC电流用于操作第一级晶体管。在设计的UWB LNA中，在第二阶段中使用公共源（CS）阶段，以增强高频状态的总增益。使用标准90？NM CMOS技术，所呈现的UWB LNA导致增益$$ hbox {s} _ {21} $$ 20.10 pm 1.65 ， hbox {db} $$ 20.10±1.65 DB跨越3.1-10.6？GHz频率范围，并从1Ωv电源电压耗散11.52兆瓦功率。但是，输入反射，$$ hbox {s} _ {11} $$ s 11，低于$$ - ，10 $$ - 10？DB从4.9-9.1？GHz频率。而且，输出反射（$$ hbox {s} _ {22} $$ s 22）和反向隔离（$$ hbox {s} _ {12} $$ s 12），低于$$ - ， 10 $$ - 10和$$ - ，48 $$ - 48？DB，用于超宽带区域。除此之外，所提出的UWB LNA的最小噪声系数（$$ hbox {nf} _ {min} $$ nf min）值在2.1-3的范围内为3.1-10.6？GHz频率范围AA级别的$$ pm ，0.45 ， hbox {db}在$$ hbox {nf}中$$±0.45 dB _ {min} $$ nf min特性。在第三阶输入截取点（IIP3）方面分析了设计的LNA的线性，其值为$$ - ，4.22 $$ - 4.22？DBM，当在6个？GHz时施加两个音调信号时，具有10的间距？MHz。所提出的电路的其他重要效果是其组延迟变化和$$ PM ，115 ， hbox {ps}的增益变化$$±115 ps和$$ pm ，1.65 ， hbox { DB}分别$±1.65 dB。

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