Estimados alumnos:
Están todos cordialmente invitados a una nueva Charla de Postgrado, la que se realizará el próximo martes 28 de Septiembre a las 13:00 hrs. En esta ocasión se trata de un invitado externo, ex alumno de nuestro Departamento.
Relator: ENRIQUE ALVAREZ-FONTECILLA, received the B.Sc. and M.Sc. degrees from Pontificia Universidad Católica de Chile (PUC), Santiago, Chile, in 2011 and 2013, respectively, and the Ph.D. degree from the University of California at San Diego, San Diego, CA, USA in 2021, all in electrical engineering. From 2012 to 2015, he was an Adjunct Assistant Professor at the School of Engineering and the Institute of Philosophy, PUC. He is currently an Algorithm Design Engineer with Analog Devices Inc., San Diego, CA, USA, where he works on high-speed analog-to-digital converters.
Titulo: "Spectral Breathing and its Mitigation in Digital PLLs".
Abstract: Although digital phase-locked loops (PLLs) offer several advantages over their analog counterparts, they suffer from a major disadvantage that is rarely mentioned in published articles. The disadvantage, known as spectral breathing, is caused by component mismatches among the frequency control elements within a PLL’s digitally controlled oscillator (DCO). The mismatches introduce DCO frequency modulation nonlinearity which fluctuates and, therefore, causes erratic variations in the PLL’s measured phase noise spectrum as the DCO’s free-running frequency drifts. The phenomenon is called spectral breathing because the measured phase noise spectrum tends to slowly swell and contract over time as if taking breaths of air. During these breaths, the PLL’s phase noise often becomes severely degraded. In this talk, an experimental demonstration of the spectral breathing phenomenon and its solution in a digital fractional-N PLL are presented. The demonstrated solution is a multi-rate dynamic element matching technique and a mismatch-noise cancellation technique that together eliminate spectral breathing.
Los esperamos a las 13:00 hrs. Si quieres participar, favor inscríbete en el adjunto.
Unirse a la reunión Zoom: zoom.com/my/abusleme
Atentos saludos,
MATIAS NEGRETE