Signal spectrum studying at double frequency conversion

DOI: 10.34759/trd-2020-114-11

Аuthors

Podstrigaev A. S.^*, Smolyakov A. V.^**

Saint Petersburg Electrotechnical University “LETI”, 5, str. Professora Popova, Saint Petersburg, 197376, Russia

*e-mail: ap0d@ya.ru
**e-mail: andreismolyakow@gmail.com

Abstract

The article performs the harmonic composition analyzes of the output signal of the signal relay device with injection of Doppler frequency shift. Functional models of mixers and band-pass filters were developed in MATLAB. Mixers models are based on intermodulation tables. Band-pass filters models account for parasitic pass-bands. Powers of fundamental and spurious components of the output signal of device with double frequency conversion were determined by the developed models. The results were obtained for various device bandwidths. Simulation was performed for a single-tone input signal. The article considers three cases of the input signal location in the pass-band of the device, namely in the center of the band and at its borders. General patterns of changes in the device output signal while the device bandwidth changing were highlighted. Thus, with the device band-pass increasing, the power and number of spurious harmonics increase in its output signal. In each separate spectrum herewith, corresponding to the fixed value of the device band-pass, the power and number of spurious components decreases with the frequency increase. The cases, when the spectrum does not correspond to the above said patterns were considered in detail. The article demonstrates the possibility in principle to imitate Doppler frequency shift in the wide frequency band of the input signals with the relaying device of the signal with double frequency conversion. Thus, such device can be an integral part of a broadband simulator of radar targets.

Keywords:

mixer, intermodulation distortions, double frequency conversion, intermodulation tables, intermodulation distortion, Doppler frequency shift

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