Abstract
A frequency synthesizer of the microwave spectrometer of a magnetic-resonance imager (MRI) with a 0.06-T intensity of the basic magnetic field is described. The synthesizer is based on a programmable logic integrated circuit and a direct digital synthesis microcircuit. The synthesizer is capable of operating in a range up to 70 MHz with a 3-μHz tuning step, allowing one to use it in MRI systems with a basic magnetic intensity of up to 1.5 T. The unit is intended to store up to 16348 frequency values in its random-access memory, and the switching is carried out by a logic signal, the source of which can be, e.g., a pulse train programmer of the microwave spectrometer. The frequency switching rate is 1 kHz and higher. The synthesizer is loaded through a USB 2.0 standard interface.
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www.analog.com/static/imported-files/data-sheets/AD8611-8612.pdf
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Original Russian Text © D.D. Gabidullin, N.M. Gafiyatullin, N.A. Krylatykh, Ya.V. Fattakhov, 2012, published in Pribory i Tekhnika Eksperimenta, 2012, No. 4, pp. 49–51.
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Gabidullin, D.D., Gafiyatullin, N.M., Krylatykh, N.A. et al. A precision frequency synthesizer with direct digital synthesis for a low-field magnetic-resonance imager. Instrum Exp Tech 55, 462–464 (2012). https://doi.org/10.1134/S0020441212030037
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DOI: https://doi.org/10.1134/S0020441212030037