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Measurement of the Amplitude-Frequency Response of a SIS Mixer Using an Intermediate Frequency Signal
IEEE JOURNAL OF MICROWAVES. 2024. P. 214–217.
Nazarov G., Khudchenko A., Tretyakov I., Rudakov K., Filippenko L., Ivashentseva Irina, Vdovin V., Mansfeld M., Hesper R., Baryshev A., Koshelets V.
In this work we have measured the frequency response of a heterodyne receiver based on a mixer at the Superconductor-Insulator-Superconductor (SIS) tunnel junction for the frequency range 211–275 GHz. The measurement was done with a Fourier spectrometer using two methods of reading the detector signal: by direct current and by the power of the intermediate frequency output signal. The reason for studying these methods is that intermediate frequency (IF) measurements give a better signal-to-noise ratio than direct current (DC) measurements. It is found that the spectrograms obtained by these methods are different up to the degree of squaring, also for IF measurements the appearance of artefacts in the microwave range, which coincide with the bandwidth of the IF system, is found. Modelling of the spectrometer operation for both methods is carried out, explaining the reason of 'artefacts' occurrence at measurements in the intermediate frequency reading mode and describing the nature and size of the convolution of the receiver spectrum in comparison with direct current measurements.
Language:
English
Keywords: амплитудно-частотная характеристикаmicrowave measurementFrequency measurementcurrent measurementSpectroscopyReceiversDetectorsMicrowave theory and techniquesFrequency responseMixersSuperconducting microwave devicesМикроволновые измеренияСпектроскопияИзмерение токаПриёмникиДетекторыТеория и методы работы с микроволновым излучениемСмесителиСверхпроводящие микроволновые устройства
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