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What and Who
Title:Fast All-Digital Clock Frequency Adaptation Circuit for Voltage Droop Tolerance
Speaker:Matthias Függer
coming from:Max-Planck-Institut für Informatik - D1
Speakers Bio:Matthias Függer received his M.Sc. (2006) and his PhD (2010) in computer engineering from TU Wien, Austria. He worked as an assistant professor at TU Wien, and as a post-doctoral researcher at LIX, Ecole polytechnique and at MPI for Informatics. Currently, he is a CNRS researcher at LSV, ENS Paris-Saclay, and co-leading the Digicosme group HicDiesMeus on Highly Constrained Discrete Agents for Modeling Natural Systems.
Event Type:AG1 Mittagsseminar (own work)
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Level:AG Audience
Date, Time and Location
Date:Tuesday, 8 May 2018
Duration:30 Minutes
Building:E1 4
Naive handling of supply voltage droops in synchronous circuits results in conservative bounds on clock speeds, resulting in poor performance even if droops are rare. Adaptive strategies detect such potentially hazardous events and either initiate a rollback to a previous state or proactively reduce clock speed in order to prevent timing violations. The performance of such solutions critically depends on a very fast response to droops. However, state-of-the-art solutions incur synchronization delay to avoid that the clock signal is affected by metastability.

Addressing the challenges discussed by Keith Bowman in his ASYNC 2017 keynote talk, we present an all-digital circuit that can respond to droops within a fraction of a clock cycle. This is achieved by delaying clock signals based on measurement values while they undergo synchronization simultaneously. We verify our solution by formally proving correctness, complemented by VHDL and Spice simulations of a 65 nm ASIC design confirming the theoretically obtained results.

Name(s):Christoph Lenzen
Video Broadcast
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Note:This is a prep talk for the presentation at ASYNC 2018 (an EE conference), for which high quality might be especially important. Feedback concerning how to improve the presentation is highly appreciated!
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Christoph Lenzen, 04/10/2018 04:50 PM
Last modified:
Uwe Brahm/MPII/DE, 04/11/2018 04:01 AM
  • Christoph Lenzen, 04/10/2018 04:50 PM -- Created document.