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A Reconfigurable Passive Mixer-Based Sub-GHz Receiver Front-End for Fast Spectrum Sensing Functionality
IEEE Transactions on Circuits and Systems I: Regular Papers ( IF 5.2 ) Pub Date : 2021-02-01 , DOI: 10.1109/tcsi.2020.3035167
Seongjin Bae , Dongmin Kim , Dongmyeong Kim , Ilku Nam , Donggu Im

A reconfigurable parallel mixing subharmonic mixer (SHM)-based time-interleaved RF channelizer is proposed for fast spectrum sensing. The reconfigurable mixer operates as a double-balanced mixer (DBM), a double-balanced mixer with harmonic rejection (DBM&HR), and an SHM. In contrast to conventional spectrum sensing receivers to detect RF frequency bands by sweeping local oscillator (LO) frequencies, the proposed receiver scans multiple frequency bands quickly through mode change of the reconfigurable mixer. The LO generation circuit employs a voltage subtractor-based phase adder and provides highly accurate 25% duty-cycle octet-phase LO signals. The front-end implements a high LO harmonic rejection ratio (HRR) in order to avoid signal corruption by LO harmonic mixing during spectrum sensing. In experiments, the proposed receiver achieves <40.3 dB conversion gain, <6.6 dB noise figure (NF), > −35.8 dBm in-band input-referred third-order intercept point (IIP3), > −22.3 dBm out-of-band IIP3, and an average 3rd LO HRR of 43 dB over 300–800 MHz in DBM&HR mode. Over 600–1200 MHz in SHM mode, it shows >31.8 dB conversion gain, <10.4 dB NF, > −30.9 dBm in-band IIP3, and > −20.1 dBm out-of-band IIP3. The switching time between DBH&HR and SHM modes is approximately 135 ns. The power dissipation is 24.7 mW from a 1.2 V supply voltage.

中文翻译:

基于可重构无源混频器的 Sub-GHz 接收器前端,可实现快速频谱感测功能

提出了一种基于可重构并行混频分谐波混频器 (SHM) 的时间交织射频信道器,用于快速频谱感知。可重构混频器作为双平衡混频器 (DBM)、具有谐波抑制功能的双平衡混频器 (DBM&HR) 和 SHM 运行。与通过扫描本地振荡器 (LO) 频率来检测 RF 频带的传统频谱感测接收器相比,所提出的接收器通过可重构混频器的模式改变快速扫描多个频带。LO 生成电路采用基于电压减法器的相位加法器,并提供高度准确的 25% 占空比八位字节相位 LO 信号。前端实现了高 LO 谐波抑制比 (HRR),以避免频谱感测期间 LO 谐波混合造成的信号损坏。在实验中,所提出的接收器实现了 < 40.3 dB 转换增益,<6.6 dB 噪声系数 (NF),> −35.8 dBm 带内输入参考三阶截取点 (IIP3),> −22.3 dBm 带外 IIP3,以及平均 3rd LO HRR在 DBM&HR 模式下,在 300–800 MHz 范围内为 43 dB。在 SHM 模式下超过 600–1200 MHz,它显示 >31.8 dB 转换增益、<10.4 dB NF、> −30.9 dBm 带内 IIP3 和 > −20.1 dBm 带外 IIP3。DBH&HR 和 SHM 模式之间的切换时间约为 135 ns。1.2 V 电源电压下的功耗为 24.7 mW。9 dBm 带内 IIP3,以及 > −20.1 dBm 带外 IIP3。DBH&HR 和 SHM 模式之间的切换时间约为 135 ns。1.2 V 电源电压下的功耗为 24.7 mW。9 dBm 带内 IIP3,以及 > −20.1 dBm 带外 IIP3。DBH&HR 和 SHM 模式之间的切换时间约为 135 ns。1.2 V 电源电压下的功耗为 24.7 mW。
更新日期:2021-02-01
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