Canova Tech. IEEE802.3cg TF EMC/EMI measurements on 10BASE-T1S evaluation boards March 5 th 2018 PIERGIORGIO BERUTO GIAN MARCO BO
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1 Canova Tech The Art of Silicon Sculpting PIERGIORGIO BERUTO GIAN MARCO BO TF EMC/EMI measurements on 10BASE-T1S evaluation boards March 5 th 2018
2 10BASE-T1S Evaluation Board 10BASE-T1S Prototype Analog in discrete components Digital in FPGA Industrial / Automotive certified CPU with standard MAC Multidrop support
3 EMC / EMI Testing Joint session Canova Tech - Kone EMC laboratory IASELAB (Ferrara - Italy) Conducted Emission (EN 55032) Conducted Immunity (EN , EN 55024) Radiated Emission (EN CISPR 25) NOTE: referenced normatives specify both test conditions and limits. For the sake of this presentation the limits are just informative.
4 Conducted Emission Test Setup SIMULATOR (Auxiliary Equipment) AE1 10BASE- T1S AE2 10BASE- T1S 10m ISN 4 Ethernet 5 Ethernet 1 - Data Communication 1.8m in bundle for 0.8m EU T 10BASE-T1S + FILTERING BOARD 1.m LISN 2 - DC power input EMC Lab DC power module RF receiver CABLES ISN UTP CAT 5E MC > 30db TESEQ ISN T8-Cat6 AE3 10BASE- T1S Port 1 to be tested 6 Ethernet AE4 10BASE- T1S AC/DC power module 7 - AEs power supply PC1 MONITORING 3 - Ethernet - 10m AC/DC power module 8 PC power supply LISN 230VAC Optional Filter board (top)
5 Conducted Emission Test Setup
6 PSD MASK Measured PSD MASK matches simulations Slightly below upper limit currently defined in 802.3cg RBW=10 KHz VBW=1 KHz NOTE: Mask is in dbm (not dbm/hz)
7 100BASE-T1 vs 10BASE-T1S PSD 10BASE-T1S 10BASE-T1S
8 100BASE-T1 vs 10BASE-T1S PSD Simulated PSD for 100BASE-T1 and 10BASE-T1S with typical TX amplitude Red 100BASE-T1 PSD RBW=10KHz matched load Green 10BASE-T1S PSD RBW=10KHz matched load
9 Cable MC measurement AWG, 50Ω UTP, 5m, 100 Ω 1:2 2:1 50Ω BALUN BW: 3-300Mhz IL = 1 db Spectrum Analyzer 50Ω - TCL Spectrum Analyzer 50Ω - TCTL
10 CAT 5E cable under test Cable MC measurement
11 db Cable MC measurement TCL MC better than 802.3cg for f < 7MHz MC worse than 802.3cg for f > 7MHz MC adopted in 802.3cg F/MHz
12 Conducted emission - results EN peak limit EN AVG limit TRANSMITTER OFF Contribution from powered-on board Peaks caused by onboard DC/DC supplies BLACK = PEAK PINK = AVG
13 Conducted emission - results EN peak limit EN AVG limit TRANSMITTER - 2 Vp-p Sending repetitive payload (all 0x55) causes additional peaks to show up BLACK = PEAK PINK = AVG
14 Conducted emission - results EN peak limit EN AVG limit TRANSMITTER - 2 Vp-p with scrambler Peaks are redistributed over a wider spectrum Peaks due to DC/DC converters remain Additional peaks at 12.5 MHz and 25 MHz (unfiltered TX) BLACK = PEAK PINK = AVG
15 Conducted emission - results EN peak limit EN AVG limit TRANSMITTER - 1 Vp-p with scrambler BLACK = PEAK Lower than 2 Vp-p PINK = AVG Peaks due to DC/DC converters remain Additional peaks at 12.5 MHz and 25 MHz (unfiltered TX) remain
16 Conducted emission - results EN peak limit EN AVG limit TRANSMITTER - 1 Vp-p with scrambler and CMC Best Result Peaks due to DC/DC converters remain Peaks at 12.5 MHz and 25 MHz are filtered out BLACK = PEAK PINK = AVG
17 Radiated Emission Test Setup Anechoic Chamber
18 Radiated Emission results TRANSMITTER OFF (Board Contribution)
19 Radiated Emission results TRANSMITTER 2 Vp-p (without scrambler, with CMC)
20 Radiated Emission results TRANSMITTER 2 Vp-p (with scrambler, with CMC)
21 Radiated Emission results TRANSMITTER 1 Vp-p (with scrambler, with CMC)
22 Conclusions Emission tests results on evaluation boards shows that proposed PSD mask Do not preclude meeting CISPR EMC requirements, both for conducted and radiated tests Proposed PSD masks limits are close to the ones of 100BASE- T1 Immunity test results post-processing in progress To achieve CISPR 25 class-5 limits Common mode chokes are required Scrambler significantly reduces the emission peaks in case of repetitive patterns
23 Thank You!
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