Dissertation > Excellent graduate degree dissertation topics show

The Design and Verification of the Sigma-Delta Modulator

Author: LiuGuanDong
Tutor: YanYongHong; JiangAiGuo
School: Hunan University
Course: Electronics and Communication Engineering
Keywords: power amplifier Sigma-Delta modulation Signal to Noise Ratio Simulinksimulation FPGA verification
CLC: TN761
Type: Master's thesis
Year: 2011
Downloads: 40
Quote: 0
Read: Download Dissertation

Abstract


In the21st century, with the rapid development of science and technology, portable digital devices have become an integral part in people’s daily life. Designed with high efficiency, high quality audio amplifiers, you can continue to push toward high-fidelity digital devices, miniaturization, multi-functional direction.Power amplifiers play an important role in the audio system. And they directly related to the audio system’s sound quality, efficiency, power consumption, size and other properties of the good or bad. Because class D amplifier works is rather special, it has only two states on and off, so people call this amplifier "digital power amplifier " Compared with the traditional A class, B class, AB class power amplifier, D power amplifier have significant advantages: high efficiency (90%), low power consumption, small size, simple manufacturing processes and so on. So, in the background of green, class D power amplifier has been widely applied.Modulator is an important part of class D power amplifier and plays an important role in analog-digital conversion. The D class power amplifier which based on∑-△modulation has significant advantages:distortion smaller, more efficient and less susceptible to electromagnetic interference.Firstly, class D power amplifier∑-△modulation is analyzed theoretically in this paper. Established a∑-△modulator order "simple cascade structure" model, and derive the SNR and the modulator order, over sampling ratio as a function of type. Taking into account the existence of various nonlinear factors, we can introduce feedback to make the∑-△modulator work stably. This is the model of∑-△modulator which is called "Cascade-of-resonators, feedback form (CRFB)".Based on theoretical analysis, I designed the structure of a6-order CRFB∑-△modulator and simulate by using Simulink and then verify the stability. The waveform is consistent with the theoretical analysis. Finally, I used the Verilog HDL to describe the circuit and then I used FPGA to verify.The results of the simulation and verification show that the modulator has a high signal to noise ratio (about110dB) and well stability. At the same time, it takes fewer resources and has the advantages of simple. Overall, it has a certain practical value.

Related Dissertations

  1. Research and Improvement of Multi-Level Modulation Self-Adaptive Digital Predistortion Algorithm,TN722.75
  2. Design of Digital Predistorter for RF Power Amplifier Based on FPGA,TN722.75
  3. Packet Loss Recovering Technology for Speech Transmission over Network,TN912.3
  4. Research on Power Supply of Contactless Power Transfer System,TM46
  5. Design Power Amplifier of Basestation and Study on Predistortion System,TN722.75
  6. The Hebei Nanpai at the Seventh City Games and Effect Analysis Research Work,G842
  7. A Kind of High Efficient D Class Audio Power Amplifier Design,TN722.75
  8. Study on Behavoral Models of Radio Frequency Power Amplifier,TN722.75
  9. 30MHz ~ 512MHz wideband amplifier design,TN722.75
  10. Research of Spectral Beam Combining Technology for High Power Fiber Lasers,TN248
  11. Design and Implementation of Power Amplifier Control Board of Photolithography Motion Platform,TN305.7
  12. Research on 60GHz Millimeter-wave Power Source in CMOS Technology,TN722.75
  13. S-Band RF Power Amplifier Design Method,TN722.75
  14. Design of RF Power for RF-excited CO2 Laser,TN248.22
  15. The Research of Switching Power Amplifier for Microprocessor Relay Protection Testing System,TM774
  16. 100-400MHz broadband power amplifier design and implementation,TN722.75
  17. Integration technique based on linear RF power amplifier design Doherty,TN722.75
  18. The Research and Exploitation of Giant Magnetostrictive Intelligent Component Driving System,TG502.3
  19. Research of MOPA-frame 1550nm Passively Mode-locked Fiber Laser,TN248
  20. The Design of Excitation Power Supply for Ultrasonic Guided Wave Detection,TP274.53
  21. Research of Power and Data Wireless Transmission System for Visual Prosthesis,R318.1

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Modulation technique and the modulator,demodulator and the demodulator > Modulation technique and the modulator
© 2012 www.DissertationTopic.Net  Mobile