ADS-based phase noise simulation method for frequency synthesizer and frequency synthesizer
A technology of frequency synthesizer and phase noise, which is applied in the direction of instruments, special data processing applications, electrical digital data processing, etc., can solve the problems of unreasonable input data form of noise source, inaccurate simulation, etc., and achieve accurate prediction, high precision, Accurately Simulate and Predict Effects
Inactive Publication Date: 2018-09-21
XIDIAN UNIV
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[0004] To sum up, the problem existing in the prior art is: using the phase noise simulation template of the phase-locked frequency synthesizer in the ADS radio frequency simulation software for simulation, the unreasonable input data form of the noise source will lead to inaccurate simulation
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[0034] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0035] The present invention utilizes the reference oscillator, the voltage-controlled oscillator, the noise source phase noise power law mathematical function model of the N frequency division circuit to construct the phase noise source mathematical expression of the phase-locked frequency synthesizer, and utilizes the power law mathematics of each noise source The expression modifies the phase noise input model of each noise source in the ADS phase noise simulation circuit to achieve more accurate phase noise simulation prediction.
[0036] The application principle of the present invention will be described in detail bel...
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The invention belongs to the technical field of electronic measurement, and discloses an ADS simulation software-based phase noise simulation method for a phase locked frequency synthesizer. The method comprises the steps of fitting actual noise data of component devices of the phase locked frequency synthesizer according to a power law mathematic model by utilizing a nonlinear least square method, thereby obtaining mathematic representation forms of noise sources; and then modifying a phase noise simulation circuit template about the phase locked frequency synthesizer in an ADS by utilizing power law representation forms of phase noises of the devices, thereby realizing more accurate prediction of the phase noises of the phase locked frequency synthesizer. According to the method, the phase noise simulation circuit template of the ADS is compared with phase noise values obtained by the proposed ADS-based phase noise simulation method and theoretical numerical values to obtain a conclusion that the phase noise data obtained by the proposed phase noise simulation method is more accurate than that obtained by the conventional ADS-based phase noise simulation template.
Description
technical field [0001] The invention belongs to the technical field of electronic measurement, in particular to a simulation method based on the phase noise of an ADS frequency synthesizer. Background technique [0002] With the continuous development of electronic science and technology, higher requirements are put forward for the performance index of the frequency synthesizer. In the communication system, with the continuous improvement of the communication bandwidth and the increasingly dense channels, the phase noise requirements of the key signals in the communication system are also getting higher and higher. Phase noise is an important indicator affecting the output frequency stability of the frequency synthesizer. At the same time, it has attracted more and more attention. Many engineering designers at home and abroad will use some RF simulation software to simulate and predict the phase noise of the phase-locked frequency synthesizer before designing the frequency s...
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IPC IPC(8): G06F17/50
CPCG06F30/367G06F2119/10
Inventor 陈晓龙段秀林李丹丹李智奇
Owner XIDIAN UNIV