Dissertation > Excellent graduate degree dissertation topics show

Design and Optimization of the Audio DAC Digital Path

Author: YangXuan
Tutor: LeiZuoMing
School: Huazhong University of Science and Technology
Course: Semiconductor chip system design and technology
Keywords: digital analog converter oversampling interpolation filter ΔΣmodulator noise shaping
CLC: TN713
Type: Master's thesis
Year: 2011
Downloads: 43
Quote: 0
Read: Download Dissertation

Abstract


Audio electronics market grows rapidly since the 21st century. More and more consumer electronics, such as MP3 players, PMP, require high-quality audio performance. And the realization of this performance requires high-performance audio codec chip, the research of the DAC audio system has a wide range of practical significance.This paper focuses on the digital part of the audio DAC, including oversampling digital interpolation filters andΔΣmodulator. Analyzes the oversampling technique, the principle of interpolation filters and the digitalΔΣmodulator principle, structure and stability. For the interpolation filters, first selects the appropriate digital filter, and then implements the multi-level interpolation filters according to the system specifications, finally designs, optimizes and simulates the interpolation filter in the algorithm level; For digitalΔΣmodulator, first selects appropriate structure, and determines the digitalΔΣmodulator orders and the number of the quantization bits according to the theoretical analysis and matlab simulation results, finally according to the system design specifications and consideration of the circuit area, designs, optimizes and simulates the digitalΔΣModulator .Using Verilog HDL to implement the digital part of the audio DAC; In order to save circuit area, using a variety of ways, such as the use CSD coding constant coefficient multipliers, optimizes the coefficient ofΔΣmodulator to reduce the number of multipliers, shares multiplier for implementation of the interpolation filter by time division multiplexing, etc.; In order to reduce the power consumption of half-band interpolation filter, use poly phase decomposition technique. In addition, verify the integrated system using FPGA. For the CIC filter, provides an effective compensation method, that is easy to RTL implementation.Based on the theoretical study on theΔΣDAC, specially the interpolation filter and the digitalΔΣmodulator, designs and implements the digital part of the audio DAC, and finally synthesizes and post-simulates by using the FPGA. The circuit consumes 1971 LEs and 3672bits embedded RAM, which equivalents to 30,000 logic gate. Finally, the SNR of the test result is 102.83dB, which fully achieves the desired design specifications.

Related Dissertations

  1. Millimeter wave detector signal analysis and processor design,TN911.6
  2. Study on Timing Recovery Technology for All-digital QAM Receivers,TN851
  3. A Design and Analyse for the High-powered Modulator of the Fourth Order Sigma-Delta,TN761
  4. Algorithm Research on Image Coregistration of SAR,TN957.52
  5. Non-invasive Detection System for Metallic Foreign Body,TH776
  6. Digital Phase-locked Detection System Based on FPGA,TN911.8
  7. Design of Continuous-time Sigma-Delta Modulator,TN761
  8. Design of Digital Up-converter Based on FPGA,TN773
  9. Multirate Filtering Based Fast Parallel Algorithm for Real-valued Discrete Gabor Expansion and Transform,TP391.41
  10. Delta-sigma modulator used in audio bandwidth low-power adjustable,TN761
  11. Research on High Precision Embedded Digital Power Regulator Applied to High Temperature Vacuum Kettle,TQ164
  12. Ultra-precision micro- macro motion and drive designs,TM301.2
  13. IP Design for USB2.0 Host/Device Controller and OTG Research,TM571
  14. Powerdensity Measurement System of Laser Surgery Instrument,R197.39
  15. Research & Design of Digital Audio Signal Processing Technology on the Basis of FPGA,TN911.72
  16. Sigma-Delta modulator digital post-processing circuit design,TN761
  17. Analysis and Design of a Fourth Order Bandpass Sigma-Delta Modulator,TN761
  18. Research and Improvement of Particle Filter Algorithm,TN713
  19. Research on the Improvement and Realization of the Matching Filter and Timing Synchronization Algorithm in High Data Rate System,TN919.6
  20. Research on Key Technology of 16 Bit Sigma-delta ADC,TN792
  21. The Predistortion Algorithm Used in Digital Audio Amplifier,TN722

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Filtering techniques,the filter
© 2012 www.DissertationTopic.Net  Mobile