Research And Implementation Of Key Algorithms For Signal Processing In Phase Noise Test System

Phase noise is an important indicator to describe the frequency stability of the clock signal,and is crucial for signal analysis and testing work.The rapid development of electronic technology makes the clock signal quality raise a higher need,and the traditional phase noise test system has not adapted to the current development.The new-generation phase noise test system uses more advanced theories and technologies,with lower bottom noise and faster test time.This paper focuses on cross-correlation algorithm and power spectrum estimation algorithm,and the algorithm is verified in FPGA.This article mainly studies the following aspects:1.Research on phase noise measurement method and principle.We firstly study the theoretical background and structure of the mainstream phase noise test system,finally uses the architecture of analog phase discrimination and digital processing.2.Research on digital processing algorithm of phase noise for cross-correlation spectrum estimation.In this paper,the performance of the algorithm of direct estimation and indirect estimation of the power spectrum is compared,and the algorithm simulation of the cross-correlation power spectrum is carried out.It is finally proved that the multiple cross-correlation algorithm can obtain a lower noise floor power spectrum curve.The conclusion of the suppression effect on the bottom of the noise.3.Research on multi-resolution power spectrum estimation scheme.Aiming at the problem of the near-end resolution mismatch in cross-correlation power spectrum estimation,a multi-resolution power spectrum estimation scheme is proposed.The decimation filter design is implemented using the cascade of CIC+FIR,which can realize multi-resolution spectrum estimation.Using FPGA's limited hardware resources,a variety of data processing structures in the digital processing module are designed,which improves the calculation speed while minimizing resource utilization.In addition,this paper studies the modular design of the phase noise processing algorithm,and realizes the design of the clock management module,control module,data transmission across the clock domain,and data flow control structure.In this paper,the algorithms of this phase noise test system are verified to achieve the design goals.