24 September 2012 A new phase-lock algorithm for the ALMA receivers
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In this work, a new phase-lock algorithm for the Local Oscillator system of the ALMA receiver is presented. This new algorithm replaced the look-up table based scheme used originally in the ALMA receivers. In this new scheme all variables are adjusted dynamically on each lock attempt, except for the YIG oscillator frequency limits. The new developed is able to correct aging and non-linearity of the YIG oscillators used in the LO system. The provided solution reduces the locking time in up to a factor of ten, improving lock success rate up to 99.91%.
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Juan Pablo Garcia, Claudio Alvarez Barros, "A new phase-lock algorithm for the ALMA receivers", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 845232 (24 September 2012); doi: 10.1117/12.926777; https://doi.org/10.1117/12.926777

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