Understanding Electromagnetic Compatibility Through DSP and Signal Integrity

Delve into the realm of Electromagnetic Compatibility (EMC) through an insightful presentation on DSP for EMC advisor with a focus on DC suppression, EMI reduction, power spectral density, signal integrity, 8b/10b encoding, EMI effects on periodic signals, scramblers, and linear feedback shift registers. Explore key concepts and practical applications in the field of EMC.

• Electromagnetic Compatibility
• DSP
• Signal Integrity
• EMI Reduction
• Power Spectral Density

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1. DSP for Electromagnetic Compatibility Advisor: Jian-Jiun Ding Presenter: Yun-Ting Tsai Presentation Date: 2022/06/10

2. Outline Introduction to EMC DC Suppression EMI Reduction 2

3. Introduction to EMC Electromagnetic Compatibility (EMC) Electromagnetic Interference (EMI) Electromagnetic Susceptibility (EMS) 3

4. Power Spectral Density Power spectral density ??? is defined as ??(?)? ????? ??? = W/Hz where ??(?) is the autocorrelation function of a signal Meaning of the power spectral density: average power per frequency 4 [1] C.R. Paul, Introduction to Electromagnetic Compatibility, 2nded., John Wiley & Sons, 2006.

5. Outline Introduction to EMC DC Suppression EMI Reduction 5

6. Signal Integrity Question: What will happen when a random NRZ signal pass through a capacitor? 10-Gbps signal 6

7. 8b/10b Encoding (1/2) 7 [2] https://en.wikipedia.org/wiki/8b/10b_encoding

8. 8b/10b Encoding (2/2) 8

9. Outline Introduction to EMC DC Suppression EMI Reduction 9

10. EMI Question: What will happen when a signal is periodic? 10

11. Scrambler Addictive scrambler Pseudorandom sequence 01011010101011100001010110 Data Output 0101010101010101010 01011111100 11

12. Linear Feedback Shift Register (1/3) Fibonacci LFSRs ?16+ ?14+ ?13+ ?11+ 1 1 0 1 0 0 0 0 1 0 1 0 0 1 0 1 0 1 0 0 1 0 1 0 1 1 0 1 0 1 0 1 1 0 1 0 1 0 1 1 0 1 0 0 0 1 1 0 1 1 0 0 1 1 0 1 1 0 0 1 1 1 1 1 0 0 1 0 1 1 1 0 0 0 0 1 1 1 0 0 0 0 1 1 1 0 0 0 0 1 1 1 0 0 0 0 1 12 [2] https://en.wikipedia.org/wiki/Linear-feedback_shift_register

13. Linear Feedback Shift Register (2/3) Galois LFSRs ?16+ ?14+ ?13+ ?11+ 1 1 1 0 0 0 0 0 1 1 0 0 0 1 1 1 1 0 0 0 0 1 1 1 0 1 0 0 1 1 1 1 0 0 0 1 1 0 1 0 0 0 1 0 0 1 0 0 0 1 0 0 1 0 0 1 1 0 0 1 0 1 1 1 0 0 1 0 1 1 1 0 0 0 0 1 1 1 0 0 0 0 1 1 1 0 0 0 0 1 1 1 0 0 0 0 1 13 [2] https://en.wikipedia.org/wiki/Linear-feedback_shift_register

14. Linear Feedback Shift Register (3/3) Amaximal-length LFSR has 2? 1 states Amaximal-length LFSR Anon-maximal-length LFSR ?4+ ?3+ 1 ?4+ ?2+ 1 1 0 0 0 1 0 0 1 1 0 1 0 1 1 1 1 0 1 0 0 1 1 0 1 0 1 1 1 1 0 0 0 0 0 1 0 0 1 1 0 1 0 1 1 1 1 0 0 0 0 0 1 0 0 1 1 0 1 0 1 1 1 1 0 1 0 0 0 1 0 1 0 1 0 0 0 1 0 0 0 1 0 1 0 0 0 0 0 1 0 1 0 Output period: Output period: ?4 1 = 15 bits 6 bits 14

15. EMI Suppression Addictive scrambler Pseudorandom sequence ?16+ ?14+ ?13+ ?11+ 1 Data Periodic NRZ signal 15

16. Summary 16

17. THANK YOU! 17