Mitigating interference from switch-mode power supplies in sampling receivers
DOI:
https://doi.org/10.17159/2413-3051/2018/v29i1a1441Keywords:
SMPS, FMCW, range-Doppler processingAbstract
This paper presents the research and development of techniques to mitigate interference from switch-mode power supplies (SMPS) in sampling receivers and also more specifically for FMCW radar receiver applications. During the system testing phase of an FMCW Radar at Reutech Radar Systems (RRS), it was found that a large false target was emerging on the Range-Doppler Map (RDM). It was concluded that the problem was originating from interference caused by the SMPS, which supplies DC power to the radar receiver subsystem. This created the need for a new DC power supply, which is able to minimize the interference itself, and mitigate the effects of the interference caused by the switching of the power supply. The study was divided four main sections, namely, research, simulation, design and evaluation. The research involved obtaining background information on sampling receivers, sampling theory, Range-Doppler Processing, SMPS’s, their effects and mitigation thereof. In the simulation phase, the research was utilised to simulate the various interference mitigation techniques. A power supply PCB was designed in the design phase to practically illustrate the techniques being utilised. Lastly, during evaluation, this PCB was evaluated against the criteria set out in the research phase. The results demonstrated that the techniques of synchronising the PWM clock to the Sampling frequency and Sweep Repetition Frequency yielded a significant reduction in the SMPS noise on the RDM. This technique may also be applied in other electronic sampling systems which perform digitisation of the input data, such as Analog to Digital Converters etc.
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References
Ponsford, A. M. and Bagwell, D. J., 1988. Receiver design for high frequency ground-wave radar. London, Fourth International Conference on HF Radio Systems and Techniques: 254–258.
Aljasmi, R., 2002. Frequency modulated continuous wave-radar signal processing and parameter estimation, Linköping: Swedish defence reseacrch agency.
Brown, M. C., 1990. Practical switching power supply design. 1 ed. s.l.: Academic Press, Inc.
Dunfan Y., Xifeng W., Dongwei L., Y ongguang Z. and Shunming S., 2011. Design of a low-cost and high-performance direct current linear power supply using in electronic experiment, Heilongjiang, 2011 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference, Vol. 2:1103–1106 .
Griffiths, H. D., 1990. New ideas in frequency modulated radar. Electronics & Communication Engineering Journal 2(5): 185–194.
Ho-En L., Guan-Yu L., Ming-Hwa S., Siang-Min S. and Sin-Siang W., 2013. A computation efficiency and-constant false alarm rate. Beijing, 2013 Ninth International Conference on Intelligent Information Hiding and Multimedia Signal Processing: 108–112.
Howie, J., 2015. Design Rule Checking. [Online]
Available at: https://techdocs.altium.com/display/ ADOH/Design+Rule+Checking [Accessed 31 March 2016].
Huffman, B., 1991. Efficiency and power characteristics of switching regulator circuits. [Online]
Available at: http://cds.linear.com/docs/en/application-note/an46.pdf [Accessed 15 October 2015].
Indiana University, 2013. Nyquist theorem and aliasing. [Online] Available at: http://www.indiana.edu/ ~emusic/etext/digital_audio/chapter5_nyquist.shtml
[Accessed 30 March 2016].
Institute for Interconnecting and Packaging Electronic Circuits (IPC), 1999. IPC-A-600F. F ed. Northbrook: IPC.
Institute for Interconnecting and Packaging Electronic Circuits (IPC), 2002. IPC/WHMA-A-620 – Requirements and acceptance for cable and wire harness assemblies. [Online] Available at: http:// www.ipc.org/TOC/IPC-A-620.pdf [Accessed 05 October 2015].
Institute for Interconnecting and Packaging Electronic Circuits (IPC), 2014. IPC-J-STD-001E – Requirements for soldered electrical and electronic assemblies. E ed. s.l.:IPC.
Institute for Interconnecting and Packaging Electronic Circuits (IPC), 2016. IPC – Association connecting electronics industries — Overview document. [Online] Available at: http://www.ipc.org/2.0_ IPC/2.1_About/pdfs/IPC_Overview.pdf
[Accessed 28 February 20157].
Kuo-Bin L., Chen-Yao L. and Jeng-Tzong S., 1999. High efficiency linear power supply with a preregulator controlled by keeping constant RDS of MOSFET. New York, Proceedings of the 1999 Particle Acellerator Conference, Vol. 5: 3776–3778.
Teodorescu, L. and Brezeanu, G., 2014. High efficiency low noise linear power supply for high power measurement systems. Bucharest, 2014 International Symposium on Fundamentals of Electrical Engineering: 1–5.
Linear Technologies, 2009. LTC3601 15V Monolithic synchronous step-down regulator. [Online]
Available at: http://cds.linear.com/docs/en/ datasheet/3601fc.pdf [Accessed 28 February 2017].
Linear Technologies, 2013. Basic concepts of linear regulator and switching mode power supplies. [Online]
Available at: http://cds.linear.com/docs/en/application-note/AN140fa.pdf [Accessed 28 January 2014].
Mee, S. W. and Teune, J. E., 2002. Reducing emissions in the buck converter switch-mode power supply. Minneapolis, Electromagnetic Compatibility, 2002. IEEE International Symposium, Vol. 1: 179–183.
National Instruments, 2016. Aliasing and sampling at frequencies above the nyquist frequency. [Online]
Available at: http://www.ni.com/white-paper/3000/ en/ [Accessed 31 March 2016].
Olshausen, B. A., 2000. Aliasing. [Online]
Available at: http://redwood.berkeley.edu/bruno/ npb261/aliasing.pdf [Accessed 30 March 2016].
Pefhany, S., 2014. What benefit is there in synchronizing my switching supply to the system clock. [Online]
Available at: http://electronics.stackexchange.com/ questions/97865/what-benefit-is-there-in-synchronizing-my-switching-supply-to-the-system-clock
[Accessed 31 March 2016].
Deacon, P, Hunt, R, Koenigsknecht, D, Leonard, C and Oakley, C., 2011. Frequency modulated continuous wave radar. [Online] Available at: http://www.egr. msu.edu/classes/ece480/capstone/fall11/group06/style/Technical%20Presentation.pdf [Accessed 31 March 2016].
Salous, S., 1986. Frequency modulated continuous wave channel sounder with digital processing for measuring the coherence of wideband high frequency radio links. Communications, Radar and Signal Processing, IEE Proceedings F, 133(5): 456–462.
Siversima, 2011. Frequency modulated continuous wave radar sensors. [Online] Available at: http://www.siversima.com/wp-content/uploads/ 2011/06/FMCW-Radar-App-Notes-Frequency-Modulated-Continuous-Wave-Radar.pdf
[Accessed 20 January 2015].
Skolnik, M. I., 1980. Introduction to radar systems. 2nd ed. s.l.: McGraw-Hill.
Stove, A., 1992. Linear Frequency Modulated Continuous Wave radar techniques. Radar and Signal Processing, IEE Proceedings F 139: 343–350.
Chand, S. and Sathyanarayanan, A., 2006. Emission analysis & compliance practices of switch-mode power supplies. Bangalore, 9th International Conference on Electromagnetic Interference and Compatibility: 189–194.
Texas Instruments, 2011. Intermediate frequency sampling receiver concepts. [Online]
Available at: http://www.ti.com/lit/wp/snaa107/ snaa107.pdf [Accessed 2 February 2015].
Wagner, T, Feger, R and Stelzer, A., 2013. Wide-band range-doppler processing for frequency modulated continuous wave systems. Nuremberg, 2013 European Radar Conference: 160–163.
Van der Merwe, P. J., 2015. [Interview] (10 March 2015).
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