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Built-in Local Oscillators for Radio Astronomy Receiving Systems at the 18 cm Wavelength

Transactions of IAA RAS, issue 48, 70–74 (2019)

Keywords: heterodyne, phase-locked loop, voltage-controlled oscillator, pulse-phase detector, VLBI.

Abstract

The paper presents the results of the development of a built-in heterodyne for microassemblies of radio astronomy receiving systems in the wavelength range of 18 cm, designed to be installed on the radio telescope RT-32. The heterodyne is a single-frequency frequency synthesizer built in a single-ring phase-locked loop scheme, which is implemented on the basis of a single chip KSN2675A. It contains a frequency synthesizer, a voltage controlled oscillator with a signal splitter and a low-pass loop filter. The frequency of synchronization of the reference signal of the heterodyne is 5 or 10 MHz. The output frequency of the 1.26 GHz heterodyne is obtained by dividing the oscillator frequency by two. The power of the heterodyne signal at the outputs is 0.8 mW at a phase temperature instability of no more than 0.8 ps/°C. The suppression of harmonics of the heterodyne output frequency is no less than 45 dB, while that for discrete components, multiples of the comparison frequency is no less than 90 dB, and power harmonics in the spectrum of the output signal — no less than 60 dB. The heterodyne signal jitter is no more than 0.5 ps, and RMS phase noise is no more than 0.2°. Power spectral density of the phase noise of local oscillator with frequency detuning from 1 kHz to 100 kHz is no less than 98 dB. The paper presents the principles of construction and functioning of the heterodyne main nodes, as well as its basic parameters.

Citation

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A. V. Krokhalev. Built-in Local Oscillators for Radio Astronomy Receiving Systems at the 18 cm Wavelength // Transactions of IAA RAS. — 2019. — Issue 48. — P. 70–74. @article{krokhalev2019, abstract = {The paper presents the results of the development of a built-in heterodyne for microassemblies of radio astronomy receiving systems in the wavelength range of 18 cm, designed to be installed on the radio telescope RT-32. The heterodyne is a single-frequency frequency synthesizer built in a single-ring phase-locked loop scheme, which is implemented on the basis of a single chip KSN2675A. It contains a frequency synthesizer, a voltage controlled oscillator with a signal splitter and a low-pass loop filter. The frequency of synchronization of the reference signal of the heterodyne is 5 or 10 MHz. The output frequency of the 1.26 GHz heterodyne is obtained by dividing the oscillator frequency by two. The power of the heterodyne signal at the outputs is 0.8 mW at a phase temperature instability of no more than 0.8 ps/°C. The suppression of harmonics of the heterodyne output frequency is no less than 45 dB, while that for discrete components, multiples of the comparison frequency is no less than 90 dB, and power harmonics in the spectrum of the output signal — no less than 60 dB. The heterodyne signal jitter is no more than 0.5 ps, and RMS phase noise is no more than 0.2°. Power spectral density of the phase noise of local oscillator with frequency detuning from 1 kHz to 100 kHz is no less than 98 dB. The paper presents the principles of construction and functioning of the heterodyne main nodes, as well as its basic parameters.}, author = {A.~V. Krokhalev}, doi = {10.32876/ApplAstron.48.70-74}, issue = {48}, journal = {Transactions of IAA RAS}, keyword = {heterodyne, phase-locked loop, voltage-controlled oscillator, pulse-phase detector, VLBI}, pages = {70--74}, title = {Built-in Local Oscillators for Radio Astronomy Receiving Systems at the 18 cm Wavelength}, url = {http://iaaras.ru/en/library/paper/1955/}, year = {2019} } TY - JOUR TI - Built-in Local Oscillators for Radio Astronomy Receiving Systems at the 18 cm Wavelength AU - Krokhalev, A. V. PY - 2019 T2 - Transactions of IAA RAS IS - 48 SP - 70 AB - The paper presents the results of the development of a built-in heterodyne for microassemblies of radio astronomy receiving systems in the wavelength range of 18 cm, designed to be installed on the radio telescope RT-32. The heterodyne is a single-frequency frequency synthesizer built in a single-ring phase-locked loop scheme, which is implemented on the basis of a single chip KSN2675A. It contains a frequency synthesizer, a voltage controlled oscillator with a signal splitter and a low-pass loop filter. The frequency of synchronization of the reference signal of the heterodyne is 5 or 10 MHz. The output frequency of the 1.26 GHz heterodyne is obtained by dividing the oscillator frequency by two. The power of the heterodyne signal at the outputs is 0.8 mW at a phase temperature instability of no more than 0.8 ps/°C. The suppression of harmonics of the heterodyne output frequency is no less than 45 dB, while that for discrete components, multiples of the comparison frequency is no less than 90 dB, and power harmonics in the spectrum of the output signal — no less than 60 dB. The heterodyne signal jitter is no more than 0.5 ps, and RMS phase noise is no more than 0.2°. Power spectral density of the phase noise of local oscillator with frequency detuning from 1 kHz to 100 kHz is no less than 98 dB. The paper presents the principles of construction and functioning of the heterodyne main nodes, as well as its basic parameters. DO - 10.32876/ApplAstron.48.70-74 UR - http://iaaras.ru/en/library/paper/1955/ ER -