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首页> 外文OA文献 >A 300-800MHz Tunable Filter and Linearized LNA applied in a Low-Noise Harmonic-Rejection RF-Sampling Receiver
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A 300-800MHz Tunable Filter and Linearized LNA applied in a Low-Noise Harmonic-Rejection RF-Sampling Receiver

机译：300-800mHz可调谐滤波器和线性化LNa应用于低噪声谐波抑制RF采样接收器

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摘要

A multiband flexible RF-sampling receiver aimed at software-defined radio is presented. The wideband RF sampling function is enabled by a recently proposed discrete-time mixing downconverter. This work exploits a voltage-sensing LNA preceded by a tunable LC pre-filter with one external coil to demonstrate an RF-sampling receiver with low noise figure (NF) and high harmonic rejection (HR). The second-order LC filter provides voltage pre-gain and attenuates the source noise aliasing, and it also improves the HR ratio of the sampling downconverter. The LNA consists of a simple amplifier topology built from inverters and resistors to improve the third-order nonlinearity via an enhanced voltage mirror technique. The RF-sampling receiver employs 8 times oversampling covering 300 to 800 MHz in two RF sub-bands. The chip is realized in 65 nm CMOS and the measured gain across the band is between 22 and 28 dB, while achieving a NF between 0.8 to 4.3 dB. The IIP2 varies between +38 and +49 dBm and the IIP3 between -14 dBm and -9 dBm, and the third and fifth order HR ratios are more than 60 dB. The LNA and downconverter consumes 6 mW, and the clock generator takes 12 mW at 800 MHz RF.udud
机译：提出了一种针对软件定义的无线电的多频带柔性RF采样接收机。宽带射频采样功能由最近提出的离散时间混频下变频器实现。这项工作采用了电压感应LNA，再加上带有一个外部线圈的可调谐LC预滤波器，以演示具有低噪声系数（NF）和高谐波抑制（HR）的RF采样接收机。二阶LC滤波器可提供电压预增益并衰减源噪声混叠，还可以提高采样下变频器的HR比。 LNA由一个简单的放大器拓扑组成，该拓扑由反相器和电阻构建，以通过增强的电压镜技术改善三阶非线性。 RF采样接收机在两个RF子带中采用8倍的过采样，覆盖300至800 MHz。该芯片采用65 nm CMOS实现，在整个频段内测得的增益在22至28 dB之间，而NF在0.8至4.3 dB之间。 IIP2在+38至+49 dBm之间变化，IIP3在-14 dBm至-9 dBm之间变化，三阶和五阶HR比大于60 dB。 LNA和下变频器的功耗为6 mW，而时钟发生器在800 MHz RF时的功耗为12 mW。

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