Digital Transmitter Revolution: From Polar to Multiphase SCPAs
KEC 1003 Mon, 03/28/2016 - 4:00pm Jeffrey Walling Assistant Professor, Department of Electrical and Computer Engineering, University of Utah Abstract: CMOS is ubiquitous for computation, and as such plays an ever increasing role in our lives as we use computation to improve working efficiency. Increasing levels of integration have made it possible to embed analog and RF circuits with digital processing to create RF systems-on-chip. The RF PA has been the exception to integration in CMOS, owing to relatively poor performance (e.g., low peak output power and low energy efficiency) when compared to other semiconductor technologies (e.g., III-V compounds, GaN and SiGe). In this talk the switched capacitor PA (SCPAs) is introduced. It leverages CMOS inherent strengths of fast switching and lithographic matching to yield a linear, efficient digital PA. The original SCPA was a polar PA, subject to significant system level non-linearity (wide bandwidth, lack of synchronization, etc). I will introduce several techniques that implement SCPAs in discrete phase spaces; several multiple phase digital PA architectures will be discussed that alleviate the need for wideband phase modulators and synchronization. I will highlight several recent examples from the University of Utah PERFIC lab’s research with applications of the multiphase techniques to the SCPA. Bio: URL: http://eecs.oregonstate.edu/colloquium/digital-transmitter-revolution-polar-multiphase-scpas _______________________________________________ Colloquium mailing list [email protected] https://secure.engr.oregonstate.edu/mailman/listinfo/colloquium
