| 基于AlGaN/GaN HEMT太赫兹探测器的340 GHz无线通信接收前端 |
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| 引用本文： | 廉宇轩,冯伟,丁青峰,朱一帆,孙建东,秦华,程凯. 基于AlGaN/GaN HEMT太赫兹探测器的340 GHz无线通信接收前端[J]. 红外与激光工程, 2021, 50(5): 20210202-1-20210202-8. DOI: 10.3788/IRLA20210202 |
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| 作者姓名： | 廉宇轩 冯伟 丁青峰 朱一帆 孙建东 秦华 程凯 |
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| 作者单位： | 1.中国科学技术大学 纳米技术与纳米仿生学院，安徽 合肥 230026 |
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| 基金项目： | 江苏省重点研发计划（BE2018005）；国家自然科学基金（61975227，61771466，61775231）；中国科学院青年创新促进会（2017372） |
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| 摘 要： | 利用天线耦合AlGaN/GaN HEMT太赫兹探测器的自混频和外差混频效应，分别设计并测试了340 GHz频段直接检波式和外差混频式接收机前端。通过接收机信噪比的测量和接收功率的定标，得到了两种接收机的等效噪声功率。直接检波模式下探测器的响应度约为20 mA/W，直接检波模式和外差混频模式下接收机的等效噪声功率分别约为?64.6 dBm/Hz1/2和?114.79 dBm/Hz。在相同的载波功率和接收信号带宽条件下，当本振太赫兹波功率大于?7 dBm时，外差混频接收的信噪比优于直接检波的信噪比。当本振功率大于0 dBm时，外差混频接收机表现出优良的解调特性，其信噪比高出直接检波接收机的信噪比10 dB以上。
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| 关 键 词： | 氮化镓 太赫兹无线通信 太赫兹探测器 直接检波 外差混频 |
| 收稿时间： | 2021-04-12 |
340 GHz wireless communication receiving front-ends based on AlGaN/GaN HEMT terahertz detectors |
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| Affiliation: | 1.School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China2.Key Laboratory of Nanodevices and Applications, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China3.School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China4.Enkris Semiconductor, Inc., Suzhou 215000, China |
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| Abstract: | Based on the self-mixing and heterodyne mixing effects of antenna-coupled AlGaN/GaN HEMT terahertz detectors, two receiving front-ends, namely homodyne receiver and heterodyne receiver, were designed and tested in 340 GHz frequency band, respectively. The equivalent noise powers of two receivers were calculated through measuring the signal-noise ratio (SNR) of the signal and the received power. The experimental result indicates that the responsivity of detectors is about 20 mA/W for homodyne receiver, the noise equivalent power is about ?64.6 dBm/Hz1/2 for homodyne receiver and ?114.79 dBm/Hz for heterodyne receiver, respectively. With the same carrier power and the signal bandwidth, the SNR of the heterodyne receiver is greater than that of the homodyne receiver when the local terahertz source power is greater than ?7 dBm. The heterodyne receiver exhibits excellent demodulation characteristics: a local terahertz source power above 0 dBm boosts the SNR by more than 10 dB compared with the homodyne receiver. |
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