Measurement of Microwave Signal Frequency by a Pair of Spin-Torque Microwave Diodes
Measurement of Microwave Signal Frequency by a Pair of Spin-Torque Microwave Diodes
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DOI：
10.1109/lmag.2021.3088400
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发表时间：
2021-06
影响因子：
1.2
通讯作者：
P. Artemchuk;Jieyi Zhang;O. Prokopenko;E. Bankowski;T. Meitzler;I. Krivorotov;J. Katine;V. Tyberkevych;A. Slavin
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文献类型：
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作者：
P. Artemchuk;Jieyi Zhang;O. Prokopenko;E. Bankowski;T. Meitzler;I. Krivorotov;J. Katine;V. Tyberkevych;A. Slavin
单谐振型自旋力矩微波二极管（STMD）可以用作二次检波器，当外部微波信号的功率P_{\rmrf}$已知时，可以确定该信号的频率f$。然而，除非信号的频率$f$恰好与检测器的谐振频率$f_{\rm res}$一致，否则存在有限的频率确定误差$\Delta f$。在这封信中，我们从理论上和实验上表明，如果一对独立的STMD与不同的谐振频率并联连接用于信号频率的确定，信号功率的知识是不必要的，和频率确定误差可以大大减少到$\Δ f \约$30 MHz的频率为$f \约$5.0 GHz。
A single resonance-type spin-torque microwave diode (STMD) can be used as a quadratic detector to determine the frequency $f$ of an external microwave signal when the power $P_{\rm rf}$ of this signal is known. However, unless the signal's frequency $f$ exactly coincides with the detector's resonance frequency $f_{\rm res}$, there exists a finite frequency determination error $\Delta f$. In this letter, we show theoretically and experimentally that if a pair of independent STMDs with different resonance frequencies connected in parallel is used for the signal frequency determination, knowledge of the signal power is not necessary, and the frequency determination error can be substantially reduced to $\Delta f \approx $ 30 MHz at the frequency of $f \approx $ 5.0 GHz.