Multi-beam 4 GHz microwave apertures using current-mode DFT approximation on 65 nm CMOS
Multi-beam 4 GHz microwave apertures using current-mode DFT approximation on 65 nm CMOS
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在 65 nm CMOS 上使用电流模式 DFT 近似的多波束 4 GHz 微波孔径
DOI：
10.1109/mwsym.2015.7167112
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
L. Belostotski
中科院分区：
文献类型：
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作者：
V. Ariyarathna;Sunera Kulasekera;A. Madanayake;Dora Suarez;R. Cintra;F. M. Bayer;L. Belostotski
提出了一种电流模CMOS设计，利用一种新颖的DFT近似来实现模拟域的接收模多波束。在低压电流反射镜中采用高带宽CMOS射频晶体管，可实现超过4 GHz的带宽，并具有良好的波束保真度。电流镜实现所考虑的DFT近似值的系数，仅取{0，±1，±2}的简单值。这允许使用简单的电路实现高带宽，而不需要移相器或延迟。提出的设计是一种有效实现空间离散傅里叶变换操作的方法，可以跨ULA获得多个同时的射频波束。一个使用1.2 V电流模式近似DFT在65 nm CMOS上的例子，使用来自RF套件的BSIM4模型，显示了8个独立孔径光束高达4 GHz的潜在工作。
A current-mode CMOS design is proposed for realizing receive mode multi-beams in the analog domain using a novel DFT approximation. High-bandwidth CMOS RF transistors are employed in low-voltage current mirrors to achieve bandwidths exceeding 4 GHz with good beam fidelity. Current mirrors realize the coefficients of the considered DFT approximation, which take simple values in {0,±1,±2} only. This allows high bandwidths realizations using simple circuitry without needing phase-shifters or delays. The proposed design is used as a method to efficiently achieve spatial discrete Fourier transform operation across a ULA to obtain multiple simultaneous RF beams. An example using 1.2 V current-mode approximate DFT on 65 nm CMOS, with BSIM4 models from the RF kit, show potential operation up to 4 GHz with eight independent aperture beams.