← 返回 JSSC 论文列表JSSC 2014第6期RF & Wireless28nmNeural Network Accelerator
A 4-Element Phased-Array System With Simultaneous Spatial- and Frequency-Domain Filtering at the
一种采用8相位被动混频器的4元件LO相位偏移相控阵接收机，用于抑制超过0 dBm的强干扰。
28 nm CMOS, 0.6–4.5 GHz, 34–119 mW, 1 dB压缩点+12/+10 dBm, 噪声系数4–6.3 dB, IIP3 0–+2.6 dBm
相控阵干扰抑制被动混频器空间滤波频率域滤波
▸创新点1：空间和频率域滤波技术。该方法创新性地将空间和频率域滤波结合，通过被动混频器将基带滤波上变频至射频，直接在天线输入端实现干扰抑制，显著提升了抗干扰能力。
▸创新点2：基于基带电容的被动混频器。电路创新中采用8相被动混频器并终止于基带电容，实现了高效的信号处理，同时降低了功耗和复杂度，提升了系统性能。
▸创新点3：第三谐波接收以实现宽频带覆盖。系统创新中利用第三谐波接收技术，实现了0.6–4.5 GHz的宽频带覆盖，同时提供了阻抗匹配，显著扩展了应用范围。
▸创新点4：高线性度和低噪声设计。通过优化电路设计，实现了高达+12 dBm的1 dB压缩点和4–6.3 dB的噪声系数，显著提升了系统的动态范围和接收灵敏度。
Abstract
To reject strong interference in excess of 0 dBm, a 4-element LO-phase shifting phased-array r eceiver with 8-phase passive mixers terminated by baseband capacitors is presented. The passive mixers upconvert bot h the spatial and frequency do- main filtering from baseband to RF, hence re alizing blocker sup- pression directly at the antenna inputs. A comprehensive mathe- matical 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, wh ile 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.