Common Mode Choke
Transcript of Common Mode Choke
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© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
USB 3.1 Type-C solutions from Texas Instruments and Würth Elektronik
Speaker:Frank Puhane
Würth Elektronik eiSosGmbH & Co. KG
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117.08.2016 | Wurth Elektronik eiSos | Public | Common Mode Chokes
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Common Mode Choke
• For signal integrity it is recommended to not filter the first four harmonics • Cut off frequency should be greater than the fourth harmonic
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Time [ms] Frequency [GHz]
Time [ms]Frequency [GHz]
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Common Mode Choke
• Signal has a NRZ-coding and data rate is 1Gbit/s• Filter with two SMD-Ferrite => WE-CBF HF• Transmission line without filter (left) and with SMD-Ferrites WE-CBF HF (right)
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Common Mode Choke
• Inserted components changes the impedance of the system• Causes unwanted reflexion
• Solution: insert components without differential impedance
• Signal has a NRZ-coding and data rate 2,5Gbit/s• Reflexion because of impedance mismatching
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Common Mode Choke
• Comparison between WE-CNSW (black) and WE-CNSW HF (red)
• Same impedance in common and differential mode
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Common Mode Choke
• S-Parameter measurement• S-Parameter with 4-Port measurement
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Common Mode Choke
• Measurement setup (simulation with Qucs)
[Hz] [Hz]
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• Comparison between WE-CNSW (left) and WE-CNSW HF (right)
Common Mode Choke
[Hz] [Hz]
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Common Mode Choke
• Data rate: 2,5 Gbit/s • Difference in signal integrity is not so big• Harmonics of the signal are not filtered
WE-CNSW WE-CNSW HF
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Common Mode Choke
• Data rate: 5 Gbit/s• Difference in the signal because of the differential impedance
WE-CNSW WE-CNSW HF
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Common Mode Choke
• Data rate: 7 Gbit/s• WE-CNSW filters the fundamental frequency of the signal• WE-CNSW HF filters only the high frequency harmonics of the signal
WE-CNSW WE-CNSW HF
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1117.08.2016 | Wurth Elektronik eiSos | Public | Common Mode Chokes
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Common Mode Choke