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The Implementation of Delta-Sigma Modulation in Digital-to-Analog Converter

The Implementation of Delta-Sigma Modulation in Digital-to-Analog Converter. Group member: Zhaoxin Mamengduo Cfang Stanley . Project Idea. Motivation: EE 505 CMOS Data Conversion circuits During the process of digital-to-analog converting

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The Implementation of Delta-Sigma Modulation in Digital-to-Analog Converter

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  1. The Implementation ofDelta-Sigma Modulation in Digital-to-Analog Converter Group member: ZhaoxinMamengduoCfangStanley 

  2. Project Idea Motivation: EE 505 CMOS Data Conversion circuits During the process of digital-to-analog converting • Use Delta-sigma modulator to push noise in music to high frequency band • Use speaker/headphone as the low-pass filter to filtrate high frequency white noise

  3. Top Level Components PCM(digital) In Serial Delta-sigma modulation Pulse Width Modulation (PWM,digital) Signal In Serial Low pass filter

  4. Level-shifter for DVD Output Signal • Output signal(from DVD) voltage: -0.5V~+0.5V Schmidt trigger: SN74LS14N rheostat

  5. Demo • Film1Play CD http://www.youtube.com/watch?v=582E_OXeVOU • Film2Input signal voltage shift http://www.youtube.com/watch?v=uBhcLwn46QM&feature=youtu.be • Film3Sleep mode http://www.youtube.com/watch?v=Q74URMVuhF8&feature=youtu.be

  6. The Structure of DAC module

  7. Input: PCM

  8. The 3-stage Delta-sigma Modulation • Y1＝X+(1－Z-1)•Q • Y2＝－Q1＋（1－Z－1)•Q2 • Y3＝（－Q2）＋ (1－Z-1)•Q3 • Y＝ X+（1－Z－1)3•Q3 PCM PWM

  9. Eleven PWM Signals

  10. Output: PWM • PWM: digital signal but has analog info.

  11. Matlab Simulation:Noise is pushed to higher frequencies

  12. Using Filter to Cutoff Noise

  13. One Order Noise Shaping Model • Q＝Y－U • U－Y＝－Q • U＝X－Q

  14. One Order Noise Shaping Model • U(n)＝X(n)－Q(n-1) • Q(n)＝Y(n)－U(n) • Y(n)＝X(n)－Q(n－1)＋Q(n) ＝X(n)＋Q(n)－Q(n－1) • Q(n)－Q(n－1)＝（1－Z－1）•Q • Y＝X＋（1－Z－1）•Q

  15. The 3-stage Delta-Sigma Modulation • Y1＝X+(1－Z-1)•Q • Y2＝－Q1＋（1－Z－1)•Q2 • Y3＝（－Q2）＋ (1－Z-1)•Q3 • Y＝ X+（1－Z－1)3•Q3

  16. Clock Synchronization with DVD • Input signal(from DVD) is in serial: Need to decode SPDIF signal • So need to synchronize clock with DVD

  17. Clock Synchronizationand Data Extraction

  18. Clock Synchronization • 44.1kHz frame rate×2 channel ×32 data×2 phase ＝5.6448MHz • Keep detecting : temp1=temp2=temp3 & temp4=temp5=temp6 • Then generate sampling clock @ center pulse

  19. Clock Synchronization(cont.)

  20. Data Extraction

  21. Data Extraction(cont.) • Keep detecting frame header 11100010 or 00011101 | 11100100 or 00011011

  22. Sleep Mode(Power Saving) system

  23. Volume Control • Matlab verification • Lower volume: right shift • Larger volume: left shift • Debounce module( real world)

  24. Reference • http://en.wikipedia.org/wiki/Delta-sigma_modulation • http://www.cscamm.umd.edu/programs/ocq05/adams/adams_ocq05.pdf • http://www.beis.de/Elektronik/DeltaSigma/DeltaSigma.html • http://www.intersil.com/data/an/an9504.pdf • http://hephaestusaudio.com/media/2009/07/MASH-Delta-Sigma.pdf

  25. Thank you! Q and A

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