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摘要:
为满足宽带天线通信系统多输入多输出的要求,提出了一种新型路径共享真时延波束合成架构。通过真时延单元提供的一定延时差弥补信号到达天线的时间差,合成多路信号来提高输出能力。相比于传统的波束合成架构,该架构通过真时延单元共享,节省芯片面积。该架构具有中心对称性与可扩展性,可支持2
M 个输入和2K 个输出。基于HHNEC 0.18 μm CMOS工艺设计四入四出波束合成器单元,对提出的架构加以验证。仿真结果表明,工作频带为0.5~1.5 GHz,延时分辨率为80 ps、最大延时为720 ps。在天线间距为10.5 cm的情况下,能够提供±43°和±13°四个扫描角度。输入输出回波损耗≤-10 dB,带内整体增益为约26 dB,增益平坦度≤3 dB。版图面积(包括I/O焊盘和ESD)为3.69 mm×3.62 mm。Abstract:In order to meet the requirement of multi-input and multi-output of broadband wireless communication system, a new path-sharing true-time-delay beamformer architecture is proposed in this paper. The output capability is improved by synthesizing multiple signals, compensating the time difference in reaching the antenna with a certain delay difference provided by the true-time-delay unit. Compared with the traditional beamformer architecture, this architecture can save the area of chip by true-time-delay unit sharing. It is not only extensional, supporting 2
M antennas and synthesizing 2K signal beams, but also symmetrical. Based on HHNEC 0.18 μm CMOS process, four-in-four-out beamformer is designed to verify the proposed architecture. The simulation results show that this beamformer works over 0.5-1.5 GHz and has four antennas, with delay resolution of 80 ps and maximum delay of 720 ps. It can provide four scanning angles of ±43° and ±13° for four antennas with 10.5 cm spacing. The input-output return loss is not more than -10 dB, the gain is about 26 dB, and gain flatness is not more than 3 dB. The layout area (including I/O pad and ESD) is 3.69 mm×3.62 mm.-
Key words:
- multi-beam /
- path-sharing /
- true-time-delay /
- group delay /
- ultra wide band
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表 1 本文与其他文献的波束合成器性能对比
Table 1. Performance comparison with other references of beamformer
参数 文献[6] 文献[9] 文献[16] 文献[17] 本文 工艺 0.18 μm CMOS 0.13 μm CMOS 0.13 μm CMOS 0.14 μm CMOS 0.18 μm CMOS 带宽/GHz 0.35~1 1~15 0.1 ~2 1~2.5 0.5~1.5 延时通道 4 4 1 4 4 输出端口个数 4 1 1 1 4 延时范围/ps 0~720 0~225 250~1 700 0~550 0~720 分辨率/ps 80 15 10 14 80 增益/dB 18.5 24 0.6 12* 26 功耗/mW 234 555 112~364 450 544 面积/mm2 20.0 9.9 0.6 1 13.4 真时延技术 LC LC Gm-C Gm-C LC 注:*表示每通道增益。 -
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