A 4-Element Phased-Array System With Simultaneous Spatial- and Frequency-Domain Filtering at the Antenna Inputs
A 4-Element Phased-Array System With Simultaneous Spatial- and Frequency-Domain Filtering at the Antenna Inputs
复制标题
在天线输入端同时进行空域和频域滤波的 4 元件相控阵系统
DOI：
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发表时间：
2014
影响因子：
5.4
通讯作者：
B. Nauta
中科院分区：
文献类型：
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作者：
A. Ghaffari;E. Klumperink;F. V. Vliet;B. Nauta
为了抑制超过 0 dBm 的强干扰，提出了一种 4 元件 LO 相移相控阵接收器，该接收器具有由基带电容器端接的 8 相无源混频器。无源混频器将空间域和频域滤波从基带上变频到射频，从而直接在天线输入端实现阻塞抑制。综合数学模型提供了一组描述空间和频域滤波（包括缺陷）的封闭式方程。原型采用 28 nm CMOS 实现。它利用三次谐波接收，以 34-119 mW 功耗实现 0.6-4.5 GHz 的宽射频频率范围，同时还提供阻抗匹配。在频带/波束之外，测量到高达 +12/+10 dBm 的 1 dB 压缩点。 RF 频率范围内的 1 元件噪声系数为 4-6.3 dB，而测得的波束内/带内 IIP3 值为 0-+2.6 dBm。这项提出的技术有助于使射频接收器对干扰具有更强的鲁棒性，同时仍然可以灵活地调节频率。
To reject strong interference in excess of 0 dBm, a 4- element LO-phase shifting phased-array receiver with 8-phase passive mixers terminated by baseband capacitors is presented. The passive mixers upconvert both the spatial and frequency domain filtering from baseband to RF, hence realizing blocker suppression directly at the antenna inputs. A comprehensive mathematical model provides a set of closed-form equations describing the spatial and frequency domain filtering including imperfections. A prototype is realized in 28 nm CMOS. It exploits third harmonic reception to achieve a wide RF-frequency range from 0.6-4.5 GHz at 34-119 mW power dissipation, while also providing impedance matching. Out of the band/beam, a 1 dB-compression point as high as +12/+10 dBm has been measured. The 1-element noise figure over the RF-frequency range is 4-6.3 dB, while in-beam/band IIP3 values of 0- +2.6 dBm are measured. This proposed technique can be instrumental to make RF receivers more robust for interference, while still being flexibly tunable in frequency.