| Summary: | 碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 100 === In RF and microwave communications, the receiver must deal with weak signals, but the noise generated from the system will lead to these weak signals unable to be accurately measured. Noise Figure (NF) is the key to specify the noise performance of a circuit or device.
For the most accurate measurement, it is important to understand the error contributors and identify which of these can be changed to improve the accuracy of measurement results. In addition, measurement accuracy includes contributions due to the measurement instrument, the device under test (DUT) and noise source which is specified by their excess noise ratio (ENR). User will face a big challenge in reducing measurement error and achieving accurate measurement results.
This thesis use spectrum analyzer and Y Factor technique to measure noise figure based on noise source hot and cold standards. The relation between noise figure and Y Factor is also presented. Furthermore, selection of an appropriate noise source and preamplifier will reduce the measurement error and improve the accuracy of measurement results.
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