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DDS embedded in the video encoder and its Application

Author: LiZuo
Tutor: ZhangShuDan
School: Jiangnan University
Course: Microelectronics and Solid State Electronics
Keywords: Direct Digital Synthesis Spurious Rejection ROM compression Video encoder
CLC: TN74
Type: Master's thesis
Year: 2007
Downloads: 58
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Abstract


With the development of modern electronic systems, the performance of the frequency synthesizer raised higher and higher requirements. Frequency Synthesizer an impact on the performance of the entire electronic system key part. Low phase noise, high spectral purity, high-frequency switching speed and high-resolution frequency synthesis technology to become the target. Direct Digital Synthesis (DDS) technology is the second direct analog frequency synthesis (DS) technology and phase-locked frequency synthesizer (PLL) technology emerged after generation frequency synthesizer technology, with traditional frequency synthesis techniques do not have the advantage of being widely applications in communications, radar, electronic warfare and instrumentation and other fields. The subject comes from the Institute of the CLP Group 58 video encoder items. Wherein the integrated frequency synthesizer together with the multiplier and the adder constituting the signal synthesis circuit, generating quadrature carrier and the chrominance signal (UV) and synthesized uniform modulated harmonic signal. Multi-system compatible digital video encoder on the carrier frequency, resolution and signal to noise ratio has certain requirements. Direct digital frequency synthesis technique has the advantage, decided it is best suited for applications in video encoder. In this paper, the basic principle of the DDS and the logical structure of the DDS number of important parameters to determine the relationship between. Summarizes the DDS frequency synthesizer technology as a new generation of technology is relatively conventional frequency synthesis technique has the advantage, for the maximum output frequency of DDS many disadvantages such as low and spurious analyzes applied in practice more DDS PLL and DDS improved structure parallel . The DDS output spectrum ideals and made the actual analysis and simulation. Verified because the all-digital architecture brings DDS spurious sources, including phase truncation, amplitude quantization error and DAC nonlinearity errors. And the phase jitter injection technology spurious suppression technology to effectively improve the purity of the DDS output spectrum. On the use of look-up table method DDS, studied a series of ROM compression algorithm and CORDIC algorithms that can effectively reduce the delay caused by excessive ROM capacity, reliability, and power consumption. Video encoder according to the DDS output frequency index, based on a lookup table to determine the structure of the DDS module parameters. Using the quadrant symmetric algorithm, suppress spurious technical and trigonometric approximation three compression methods to improve the structure of the original and simulation proved the feasibility of improved structure, comparative analysis of the three compression methods their advantages and disadvantages.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Frequency synthesizer technology,frequency synthesizer
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