2π Low Drift Phase Detector for High-Precision Measurements
PBN-AR
Instytucja
Wydział Elektroniki i Technik Informacyjnych (Politechnika Warszawska)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
IEEE Transactions on Nuclear Science
ISSN
0018-9499
EISSN
Wydawca
IEEE Nuclear and Plasma Sciences Society
DOI
Rok publikacji
2015
Numer zeszytu
3
Strony od-do
1142 - 1148
Numer tomu
62
Identyfikator DOI
Liczba arkuszy
0.5
Autorzy
Pozostali autorzy
+ 2
Słowa kluczowe
en
Direct RF sampling RF signal phase measurement phase drift two-tone calibration
Streszczenia
Język
en
Treść
In modern particle accelerators, radio frequency (RF) phase detectors have to fulfill high demands on stability and accuracy to meet the goals of state-of-the-art synchronization systems. Especially challenging are those cases where the RF signal phase shift accuracy must be measured with fs accuracy for several hours over the full 2 π phase detection range. In these cases special measures on the component's nonlinearities and RF channel isolation have to be taken. The long-term stability of the phase detector is mostly affected by temperature and humidity variations. To meet the synchronization goals, we have built a phase detector that incorporates a high-speed dual analog-to-digital converter (ADC) with a special circuit for continuous phase drift calibration. In the calibration circuit we successfully combined the RF signal with an RF calibration signal (second tone) to compensate common phase drift that occurs in the microstrip lines, the RF transformers, and the ADC. The second-tone RF signals are directly converted to the digital domain by the fast ADC and, based on signal processing in the field-programmable gate array, are used to calculate the RF signal phase shift correction caused by detector drifts. In this paper, potential error sources of the analog and the digital part of the so-called two-tone calibration technique that limit the phase detector precision are discussed. Finally, the experimental results are presented showing a long-term phase measurement stability better than 0.01 ° pk-pk evaluated at an RF frequency of 1.3 GHz over a few days.
Inne
System-identifier
WUT409ca64cd19e4824b9b454f251ed20de
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