Erik J Ryman
Chalmers University of Technology
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Publication
Featured researches published by Erik J Ryman.
custom integrated circuits conference | 2011
Erik J Ryman; Anders Emrich; Stefan Back Andersson; J. Riesbeck; Lars Svensson; Per Larsson-Edefors
A high-speed low-power cross-correlator ASIC has been implemented in a 65-nm CMOS process for the purpose of synthetic aperture radiometry from geostationary orbiting earth observation satellites. The chip performs cross-correlation on all individual signal pairs from 64 digital 1-bit inputs, which amounts to 2016 individual cross-correlation products. The experimental evaluation, using a specially developed PCB, demonstrates that the 3-mm2 chip has a top performance of 3.6 GHz at a 1.2 V supply, at which it dissipates 790 mW.
international symposium on circuits and systems | 2013
Erik J Ryman; S. Back Andersson; J. Riesbeck; S. Dejanovic; Anders Emrich; Per Larsson-Edefors
We present a high-speed low-power 8-channel comparator tailored for the application of sampling antenna signals in a cross-correlator system for space-borne synthetic aperture radiometer instruments. Features like clock return path, perchannel offset calibration and bias current tuning make the comparator adaptable and gives the possibility to adjust the comparator for low power consumption, while keeping performance within the requirements of the cross-correlator system. The comparator has been implemented and fabricated in a 130-nm SiGe BiCMOS process. Measurements show that the comparator can perform sampling at a rate of 4.5 GS/s with a power consumption of 48 mW/channel or 1 GS/s with a power consumption of 17 mW/channel.
european solid state circuits conference | 2017
Erik J Ryman; Anders Emrich; Lars Svensson; Per Larsson-Edefors
We present a cross-correlator ASIC for synthetic aperture imaging of Earths atmosphere. Reconfigurability as a 2-level 96-channel or 3-level 48-channel cross-correlator provides adaptability to a wider array of applications. Implemented in a 65-nm CMOS process, the cross-correlator is capable of running at clock speeds of up to 3 GHz. In 2-level 96-channel mode, the cross-correlator consumes only 1.1 W at 2.5 GHz and 1.2 V, yielding a power efficiency of 96 μW/prod/GHz. The 450-Mb/s readout speed and double-buffering reduce blanking time of the interferometer system to a minimum.
conference on ph.d. research in microelectronics and electronics | 2011
Kasyab Parmesh Subramaniyan; Erik J Ryman; Magnus Själander; Tung Thanh Hoang; Mafijul Md. Islam; Per Larsson-Edefors
Designing a processor is a complex task that uses multiple and varied tools. The complete development cycle spans software as well as hardware design and verification. More often than not, in spite of the close dependencies between hardware and software, there is no common platform for quick and accurate testing of these dependencies. Though such systems are often employed in industry, it is not common for end-to-end frameworks to be deployed in educational and research settings.We present the FlexCore Design Exploration Framework (FlexDEF), an end-to-end tool-chain used to develop the FlexCore processor and its accompanying cache system. The tool-chain is a hierarchically linked system that spans the various development phases involved in design and verification. The processor system is intended to be a model, for use in research-oriented projects where both the software and hardware are in a constant state of flux. We discuss the complete framework and the advantages in each context. Finally, we summarize the developments and discuss the future of the FlexDEF tool-chain.
IEEE Journal of Solid-state Circuits | 2014
Erik J Ryman; Anders Emrich; Stefan Back Andersson; Lars Svensson; Per Larsson-Edefors
European Space Agency Microwave Technology and Techniques Workshop | 2010
Erik J Ryman; Per Larsson-Edefors; Lars Svensson; Anders Emrich; Stefan Back Andersson
Archive | 2018
Erik J Ryman
The 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad) | 2014
Erik J Ryman; Anders Emrich; Alan B. Tanner; Isaac Ramos
Proceedings of International Symposium on Space Terahertz Technology, Groningen, The Netherlands, April 8-10 2013 | 2013
Erik J Ryman; Anders Emrich; Stefan Back Andersson; Per Larsson-Edefors
Proceedings of Fourth International Workshop on Analogue and Mixed Signal Integrated Circuits for Space Applications (AMICSA) | 2012
Erik J Ryman; Anders Emrich; Stefan Back Andersson; Johan Riesbeck; Per Larsson-Edefors