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首页> 外文期刊>American journal of applied sciences >A 2-12 GHz Low Noise Amplifier Design for Ultra Wide Band Applications
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A 2-12 GHz Low Noise Amplifier Design for Ultra Wide Band Applications

机译：用于超宽带应用的2-12 GHz低噪声放大器设计

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摘要

Problem statement: The Low Noise Amplifier (LNA) is a core block of an Ultra Wide Band (UWB) receiver since it amplifies a very weak signal received at the antenna to acceptable levels while introducing less self-generated noise and distortions. The LNA design poses a unique challenge as it requires simultaneous optimization of various performance parameters like power gain, input matching, noise figure, power consumption and linearity over the entire UWB band. Approach: In this study, a three stage LNA is proposed with a resistive current reuse network as a first stage, a cascode amplifier with shunt-series peaking and a local active feedback as a second stage and a voltage buffer as a third stage. A resistive current reuse network is used to achieve better linearity, low noise figure, better input matching with lesser power consumption. A cascode stage with shunt-series peaking and a local active feedback is used to enhance the bandwidth and reverse isolation. A voltage buffer is used as an output stage to achieve better output matching. Results: The proposed LNA is designed using 0.18 μm CMOS technology and is simulated to verify its performance. It achieves a power gain of greater than 17.3 dB, a noise figure less than 2.45 dB with an input matching less than -11.2 dB over a 3-dB bandwidth of 2-12 GHz. The achieved output matching is below -12 dB, the reverse isolation is below -68 dB with a Rollet's stability factor is greater than 1000 to ensure better stability. This LNA also ensures better linearity with an IIP3 of 3 dBm at 7.5 GHz with low power consumption of 10.7 mW.Conclusion/Recommendations: From the simulation results it is evident that the presented LNA claims the advantages of very high gain, better input matching with low noise figure and less power consumption.
机译：问题陈述：低噪声放大器（LNA）是超宽带（UWB）接收器的核心模块，因为它可以将天线接收到的非常弱的信号放大到可接受的水平，同时引入更少的自生噪声和失真。 LNA设计提出了一个独特的挑战，因为它需要同时优化各种性能参数，例如功率增益，输入匹配，噪声系数，功耗和整个UWB频段的线性度。方法：在这项研究中，提出了一个三级LNA，第一级为电阻电流重用网络，第二级为共源共栅放大器，第二级为并联串联峰值，本地有源反馈，第三级为电压缓冲器。电阻电流重用网络用于获得更好的线性度，低噪声系数，更好的输入匹配以及更低的功耗。具有分流串联峰值和本地有源反馈的共源共栅级用于增强带宽和反向隔离。电压缓冲器用作输出级，以实现更好的输出匹配。结果：拟议的LNA使用0.18μmCMOS技术设计，并经过仿真以验证其性能。在2-12 GHz的3dB带宽内，它的功率增益大于17.3 dB，噪声系数小于2.45 dB，输入匹配小于-11.2 dB。实现的输出匹配低于-12 dB，反向隔离低于-68 dB，Rollet的稳定性系数大于1000，以确保更好的稳定性。该LNA还可以确保在7.5 GHz的IIP3为3 dBm且具有低功耗10.7 mW的情况下具有更好的线性度。噪声系数低，功耗低。

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