An Adaptable Time Domain Gating Implementation with Enhanced Edge Treatment for Facilitating Vector Frequency Domain Data Analyses
2024 102ND ARFTG MICROWAVE MEASUREMENT CONFERENCE, ARFTG(2023)
摘要
The utilization of time domain gating through Fourier analysis, a technique commonly employed in commercial Vector Network Analyzers (VNAs), has become an established practice for data post-processing. Despite its effectiveness, the specific implementation often remains enigmatic, leading to challenges in comprehending measurement uncertainties. Furthermore, once the data has been downloaded to a computer, it is difficult to further process or adjust gating parameters. To address these issues, we have developed a comprehensive library. The library incorporates a range of functions including inverse chirp-Z transform to convert from frequency to time domain, gating operation, and post-gate edge treatment. These functions can be used in a standalone application, or seamlessly integrate into users' programs, such as Matlab, Python, C#, or others. Our other objective is to offer transparency in the implementation, thereby enabling users to gain a clear understanding of the underlying algorithms and aiding in uncertainty evaluation. In addition to incorporating the conventional "edge renormalization" approach found in commercial VNAs, we introduce a novel method termed Spectrum Extension Edgeless Gating (SEEG). This method involves extending frequency domain data beyond the edges in a physically meaningful manner before applying time domain gating. Numerous applications of measurement attest to the efficacy of the SEEG approach, notably in significantly mitigating edge-related errors while improving measurement accuracy.
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关键词
time domain gating,edge effects,vector network analyzer,edge renormalization.
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