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1GHz the synthetic sweep source hardware circuit design

Author: XieJingLin
Tutor: HuangJianGuo
School: University of Electronic Science and Technology
Course: Measuring Technology and Instruments
Keywords: frequency synthesis PLL DDS Sweeping Frequency Source
CLC: TN74
Type: Master's thesis
Year: 2011
Downloads: 42
Quote: 0
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Abstract


In the field of modern electronic test technology, the standard signal generators with high performance is necessary either from the performance test of the most basic electronic components or to the comprehensive evaluation on large-scale electronic equipments, for example, the spectrum analyzer needing local oscillator and tracking source, and the network analyzer needing excitation source. It can also be the interference signals in the ECM equipment. Therefore, the performance of the signal source is directly related to that of the electronic systerm. The purpose of this research project is to design the synthesis sweep signal with wide range of frequency and little step frequency and fast frequency hopping.After the detailed comparison among different projects, the advantages and disadvantages of different frequency synthesis techniques are summarized. In addition, this paper points out the DDS + PLL technique and the fractional frequency technique are the main development direction to the current frequency synthesis techniques. The advantages of the DDS + PLL technique include wide frequency band, small stepping, low phase noise and fast frequency hopping, while its disadvantages are insufficient stray performance. And the fractional frequency synthesis technique is characterized by wide frequency band, small stepping, low stray, little phase noise and fast frequency hopping. By combining the advantages of both, the final project adopted in this paper is DDS + PLL technique, and the DDS is used as the the fractional frequency rather than the traditional one used as a clock.Based on the synthesis sweep frequency source, this paper proposes the final realizable project, demonstrates its feasibility and introduces each functional module design in detail. The key point is to introduce the basic theories of DDS and PLL, and the realization of each module control. Finally, debugging results prove that the design of this project conforms to the requirement of the synthesis sweep frequency source design.

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