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Svensson, Christer
Alternative names
Publications (10 of 192) Show all publications
Svensson, C. (2018). Increasing the dose efficiency in silicon photon-counting detectors utilizing dual shapers. In: Medical Imaging 2018: Physics of Medical Imaging, 2018: . Paper presented at Medical Imaging 2018: Physics of Medical Imaging, 2018 (pp. 105734W). , 0573
Open this publication in new window or tab >>Increasing the dose efficiency in silicon photon-counting detectors utilizing dual shapers
2018 (English)In: Medical Imaging 2018: Physics of Medical Imaging, 2018, 2018, Vol. 0573, p. 105734W-Conference paper, Published paper (Refereed)
Abstract [en]

Silicon photon-counting spectral detectors are promising candidates as the next generation detectors for medical CT. For silicon detectors, a low noise floor is necessary to obtain good detection efficiency. A low noise floor can be obtained by having a slow shaping filter in the ASIC, but this leads to a long dead-time, thus decreasing the count-rate performance. In this work, we evaluate the benefit of utilizing two sub-channels with different shaping times. It is shown by simulation that utilizing a dual shaper can increase the dose efficiency for equal count-rate capability by up to 17%

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-147525 (URN)
Conference
Medical Imaging 2018: Physics of Medical Imaging, 2018
Available from: 2018-04-23 Created: 2018-04-23 Last updated: 2018-04-23
Svensson, C. (2016). Letter: Response to the Comments by Willy Sansen on the paper "Towards Power Centric Analog Design," IEEE Circuits and Systems Magazine, vol. 15, no. 3, pp. 44-51, Sept. 2015. in IEEE CIRCUITS AND SYSTEMS MAGAZINE, vol 16, issue 1, pp 88-88 [Letter to the editor]. IEEE CIRCUITS AND SYSTEMS MAGAZINE, 16(1), 88-88
Open this publication in new window or tab >>Letter: Response to the Comments by Willy Sansen on the paper "Towards Power Centric Analog Design," IEEE Circuits and Systems Magazine, vol. 15, no. 3, pp. 44-51, Sept. 2015. in IEEE CIRCUITS AND SYSTEMS MAGAZINE, vol 16, issue 1, pp 88-88
2016 (English)In: IEEE CIRCUITS AND SYSTEMS MAGAZINE, ISSN 1531-636X, Vol. 16, no 1, p. 88-88Article in journal, Letter (Other academic) Published
Abstract [en]

n/a

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2016
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-126270 (URN)000370933600008 ()
Available from: 2016-03-21 Created: 2016-03-21 Last updated: 2016-04-11
He, Z., Chen, J., Svensson, C., Bao, L., Rhodin, A., Li, Y., . . . Zirath, H. (2015). A Hardware Efficient Implementation of a Digital Baseband Receiver for High-Capacity Millimeter-Wave Radios. IEEE transactions on microwave theory and techniques, 63(5), 1683-1692
Open this publication in new window or tab >>A Hardware Efficient Implementation of a Digital Baseband Receiver for High-Capacity Millimeter-Wave Radios
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2015 (English)In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 63, no 5, p. 1683-1692Article in journal (Refereed) Published
Abstract [en]

This paper presents an implementation solution for a digital baseband receiver, which consists mainly of an analog symbol timing recovery (STR) block and a digital carrier recovery block. The STR is realized based on "one-sample-per-symbol" sampling, resulting in relaxed requirement on the A/D converters sampling speed. In this sense, the proposed implementation solution is hardware efficient. To functionally verify the solution, a proof-of-concept E-band link system is implemented and tested in the laboratory, which supports 5-Gbit/s data traffic using 16 quadrature amplitude modulation. The test results demonstrate that the proposed solution works for high-capacity millimeter-wave radios for point-to-point links, one of the targeted applications.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2015
Keywords
Baseband receiver (Rx); E-band; point-to-point (PtP) radio; single sample per symbol; 16 quadrature amplitude modulation (16-QAM)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-118865 (URN)10.1109/TMTT.2015.2417541 (DOI)000354365900024 ()
Note

Funding Agencies|Swedish Foundation for Strategic Research (SSF); Vinnova

Available from: 2015-06-08 Created: 2015-06-04 Last updated: 2017-12-04
Svensson, C. (2015). Methods and QAM receiver for performing timing recovery. us 9,001,949.
Open this publication in new window or tab >>Methods and QAM receiver for performing timing recovery
2015 (English)Patent (Other (popular science, discussion, etc.))
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-122713 (URN)
Patent
US 9,001,949 (2015-04-07)
Available from: 2015-11-17 Created: 2015-11-17 Last updated: 2015-11-17
Svensson, C. (2015). Towards power centric analog design. IEEE Circuits and systems magazine, 15(3), 44-51
Open this publication in new window or tab >>Towards power centric analog design
2015 (English)In: IEEE Circuits and systems magazine, ISSN 1531-636X, Vol. 15, no 3, p. 44-51Article in journal (Other academic) Published
Abstract [en]

Power consumption of analog systems is poorly understoodtoday, in contrast to the very well developed analysis of digitalpower consumption. We show that there is good opportunity todevelop also the analog power understanding to a similar levelas the digital. Such an understanding will have a large impact inthe design of future electronic systems, where low power consumptionwill be crucial. Eventually we may reach a power centricanalog design methodology.

Place, publisher, year, edition, pages
IEEE Computer Society, 2015
Keywords
Electronics
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-120922 (URN)10.1109/MCAS.2015.2450671 (DOI)000361065600003 ()
Available from: 2015-08-31 Created: 2015-08-31 Last updated: 2015-10-07
Farahini, N., Hemani, A., Lansner, A., Clermidy, F. & Svensson, C. (2014). A scalable custom simulation machine for the Bayesian Confidence Propagation Neural Network model of the brain. In: Design Automation Conference (ASP-DAC), 2014 19th Asia and South Pacific: . Paper presented at The 19th Asia and South Pacific Design Automation Conference (ASP-DAC), January 20-23, 2014, Singapore (pp. 578-585). IEEE
Open this publication in new window or tab >>A scalable custom simulation machine for the Bayesian Confidence Propagation Neural Network model of the brain
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2014 (English)In: Design Automation Conference (ASP-DAC), 2014 19th Asia and South Pacific, IEEE , 2014, p. 578-585Conference paper, Published paper (Refereed)
Abstract [en]

A multi-chip custom digital super-computer called eBrain for simulating Bayesian Confidence Propagation Neural Network (BCPNN) model of the human brain has been proposed. It uses Hybrid Memory Cube (HMC), the 3D stacked DRAM memories for storing synaptic weights that are integrated with a custom designed logic chip that implements the BCPNN model. In 22nm node, eBrain executes BCPNN in real time with 740 TFlops/s while accessing 30 TBs synaptic weights with a bandwidth of 112 TBs/s while consuming less than 6 kWs power for the typical case. This efficiency is three orders better than general purpose supercomputers in the same technology node.

Place, publisher, year, edition, pages
IEEE, 2014
Series
Asia and South Pacific Design Automation Conference Proceedings, ISSN 2153-6961
Keywords
DRAM chips;belief networks;biomedical electronics;brain;mainframes;medical computing;neural chips;neurophysiology;parallel machines;3D stacked DRAM memories;BCPNN model;Bayesian confidence propagation neural network model;custom designed logic chip;eBrain;general purpose supercomputers;human brain;hybrid memory cube;multichip custom digital supercomputer;scalable custom simulation machine;synaptic weights;technology node;Aggregates;Bandwidth;Brain modeling;Computational modeling;Delays;Random access memory;Three-dimensional displays
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-114646 (URN)10.1109/ASPDAC.2014.6742953 (DOI)000350791700104 ()2-s2.0-84897883326 (Scopus ID)978-1-4799-2816-3 (ISBN)
Conference
The 19th Asia and South Pacific Design Automation Conference (ASP-DAC), January 20-23, 2014, Singapore
Available from: 2015-03-02 Created: 2015-03-02 Last updated: 2015-04-23
Nilsson, E. & Svensson, C. (2014). Power Consumption of Integrated Low-Power Receivers. IEEE JOURNAL ON EMERGING AND SELECTED TOPICS IN CIRCUITS AND SYSTEMS, 4(3), 273-283
Open this publication in new window or tab >>Power Consumption of Integrated Low-Power Receivers
2014 (English)In: IEEE JOURNAL ON EMERGING AND SELECTED TOPICS IN CIRCUITS AND SYSTEMS, ISSN 2156-3357, Vol. 4, no 3, p. 273-283Article in journal (Refereed) Published
Abstract [en]

With the advent of Internet of Things (IoT) it has become clear that radio-frequency (RF) designers have to be aware of power constraints, e.g., in the design of simplistic ultra-low power receivers often used as wake-up radios (WuRs). The objective of this work, one of the first systematic studies of power bounds for RF-systems, is to provide an overview and intuitive feel for how power consumption and sensitivity relates for low-power receivers. This was done by setting up basic circuit schematics for different radio receiver architectures to find analytical expressions for their output signal-to-noise ratio including power consumption, bandwidth, sensitivity, and carrier frequency. The analytical expressions and optimizations of the circuits give us relations between dc-energy-per-bit and receiver sensitivity, which can be compared to recent published low-power receivers. The parameter set used in the analysis is meant to reflect typical values for an integrated 90 nm complementary metal-oxide-semiconductor fabrication processes, and typical small sized RF lumped components.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2014
Keywords
Complementary metal-oxide-semiconductor (CMOS); Internet of things (IoT); low noise; low-power; receiver; wake-up radio (WuR)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-111454 (URN)10.1109/JETCAS.2014.2337151 (DOI)000342163700004 ()
Available from: 2014-10-21 Created: 2014-10-17 Last updated: 2016-04-08
Bornefalk, H., Persson, M., Xu, C., Karlsson, S., Svensson, C. & Danielsson, M. (2013). Effect of Temperature Variation on the Energy Response of a Photon Counting Silicon CT Detector. IEEE Transactions on Nuclear Science, 60(2), 1442-1449
Open this publication in new window or tab >>Effect of Temperature Variation on the Energy Response of a Photon Counting Silicon CT Detector
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2013 (English)In: IEEE Transactions on Nuclear Science, ISSN 0018-9499, E-ISSN 1558-1578, Vol. 60, no 2, p. 1442-1449Article in journal (Refereed) Published
Abstract [en]

The effect of temperature variation on pulse height determination accuracy is determined for a photon counting multibin silicon detector developed for spectral CT. Theoretical predictions of the temperature coefficient of the gain and offset are similar to values derived from synchrotron radiation measurements in a temperature controlled environment. By means of statistical modeling, we conclude that temperature changes affect all channels equally and with separate effects on gain and threshold offset. The combined effect of a 1 degrees C temperature increase is to decrease the detected energy by 0.1 keV for events depositing 30 keV. For the electronic noise, no statistically significant temperature effect was discernible in the data set, although theory predicts a weak dependence. The method is applicable to all x-ray detectors operating in pulse mode.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2013
Keywords
Photon counting multibin detector; spectral CT; temperature effect
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-96154 (URN)10.1109/TNS.2013.2244909 (DOI)000320856800027 ()
Available from: 2013-08-14 Created: 2013-08-14 Last updated: 2017-12-06
Xu, C., Chen, H., Persson, M., Karlsson, S., Danielsson, M., Svensson, C. & Bornefalk, H. (2013). Energy resolution of a segmented silicon strip detector for photon-counting spectral CT. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 715, 11-17
Open this publication in new window or tab >>Energy resolution of a segmented silicon strip detector for photon-counting spectral CT
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2013 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 715, p. 11-17Article in journal (Refereed) Published
Abstract [en]

We investigated the energy resolution of a segmented silicon strip detector for photon-counting spectral computed tomography (CT). The detector response to different monochromatic photon energies and various photon fluxes was characterized at the Elettra synchrotron. An RMS energy resolution of 1.50 keV has been demonstrated for 22 keV photons at zero flux, and it deteriorated as a function of input count rate at a rate of 5.1 eV mm(2)/Mcps. The charge sharing effect has been evaluated. The results show that around 11.1% of the interacting photons experience charge sharing for 22 keV photons and 15.3% for 30 keV.

Place, publisher, year, edition, pages
Elsevier, 2013
Keywords
Photon counting, Silicon strip detector, Spectral computed tomography, Energy resolution, Synchrotron
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-95497 (URN)10.1016/j.nima.2013.02.030 (DOI)000319252300002 ()
Note

Funding Agencies|Erling-Persson family foundation (Familjen Erling-Perssons stiftelse)||

Available from: 2013-07-05 Created: 2013-07-05 Last updated: 2017-12-06
Xu, C., Persson, M., Chen, H., Karlsson, S., Danielsson, M., Svensson, C. & Bornefalk, H. (2013). Evaluation of a Second-Generation Ultra-Fast Energy-Resolved ASIC for Photon-Counting Spectral CT. IEEE Transactions on Nuclear Science, 60(1), 437-445
Open this publication in new window or tab >>Evaluation of a Second-Generation Ultra-Fast Energy-Resolved ASIC for Photon-Counting Spectral CT
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2013 (English)In: IEEE Transactions on Nuclear Science, ISSN 0018-9499, E-ISSN 1558-1578, Vol. 60, no 1, p. 437-445Article in journal (Refereed) Published
Abstract [en]

A second-generation ultra-fast energy-resolved application specific integrated circuit (ASIC) has been developed for photon-counting spectral computed tomography (CT). The energy resolution, threshold dispersion and gain of the ASIC were characterized with synchrotron radiation at Diamond Light Source. The standard deviation of threshold offsets at zero keV is 0.89 keV. An RMS energy resolution of 1.09 keV has been demonstrated for 15 keV photon energy at a count rate of 40 kcps, and it deteriorates at a rate of 0.29 keV/Mcps with the increase of output cout rate. The count rate performance of the ASIC has also been evaluated with 120 kV polychromatic x-rays produced by a tungsten anode tube and the results are presented.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2013
Keywords
ASIC, photon counting, silicon strip detector, spectral computed tomography, synchrotron
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-90071 (URN)10.1109/TNS.2012.2228276 (DOI)000314973200032 ()
Note

Funding Agencies|Erling-Persson family foundation (Familjen Erling-Perssons stiftelse)||

Available from: 2013-03-21 Created: 2013-03-19 Last updated: 2017-12-06
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