The noise and spur delusion in fractional-N frequency synthesizer design

The standard design methodology for fractional-N frequency synthesizers assumes that the filtered shaped quantization noise from the requantizer is masked below the spectral envelope of the underlying integer-N synthesizer. Fractional-N frequency synthesizers are notorious for exhibiting an elevated noise floor and an unpredictable pattern of spurs. In this paper, we argue that designers should not be deluded by the overly conservative predictions of the simplified linear model but should instead consider nonlinearities as early as possible in the design process

Understanding Quantum Technologies 2022

Understanding Quantum Technologies 2022 is a creative-commons ebook that provides a unique 360 degrees overview of quantum technologies from science and technology to geopolitical and societal issues. It covers quantum physics history, quantum physics 101, gate-based quantum computing, quantum computing engineering (including quantum error corrections and quantum computing energetics), quantum computing hardware (all qubit types, including quantum annealing and quantum simulation paradigms, history, science, research, implementation and vendors), quantum enabling technologies (cryogenics, control electronics, photonics, components fabs, raw materials), quantum computing algorithms, software development tools and use cases, unconventional computing (potential alternatives to quantum and classical computing), quantum telecommunications and cryptography, quantum sensing, quantum technologies around the world, quantum technologies societal impact and even quantum fake sciences. The main audience are computer science engineers, developers and IT specialists as well as quantum scientists and students who want to acquire a global view of how quantum technologies work, and particularly quantum computing. This version is an extensive update to the 2021 edition published in October 2021.Comment: 1132 pages, 920 figures, Letter forma

The Reality of the Imaginary

Schon seit einiger Zeit wird die Architektur durch die neue Realität des Imaginären der digitalen Welt erschüttert. Mit dem digital turn sind wir Zeugen einer zunehmenden Liquidisierung einer Grenze zwischen der digitalen Bilder- und der materiellen Objektwelt. Dennoch, ob Idolatrie oder Ikonophilie, ob Handskizze oder Perspektive, war die Architektur nicht immer schon vom Bild her gedacht? War sie nicht immer schon eine Praxis medialer Grenzüberschreitung? Die Beiträge des Bauhaus-Kolloquiums gehen der Frage nach dem Grenzgängertum der Architektur zwischen Bild und Raum, zwischen Zeichenhaftigkeit und Vergegenständlichung, zwischen Realität und Imaginarität nach.The new digital media technologies have been unsetting architecture for quite some time. Since the digital turn of the 90ies we are witnessing a steady liquidification of the boundaries between the world of digital images and the world of material objects. Yet, has architecture not always been a practice that crosses media boundaries? The Bauhaus Colloquium will address the permanent border crossing in architecture between image and space, between sign and and objects as well as between the material world of objects and the imaginary worlds of images