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Td sequential equation1/4/2024 The analyzers have certain frequency limits. A noise figure meter also has limitations. An engineer can measure the noise figure over a certain frequency range, and the analyzer can display the system gain together with the noise figure to help the measurement. In most cases it is also the most accurate. Using a noise figure meter is the most straightforward way to measure noise figure. Also, certain parameters need to be set up in the Noise Figure Meter before the measurement, such as frequency range, application (Amplifier/Mixer), etc. For certain applications (mixers and receivers), a LO signal might be needed, as shown in Figure 1. Since the input noise and Signal-to-Noise ratio of the noise source is known to the analyzer, the noise figure of the DUT can be calculated internally and displayed. The output of the DUT is then measured by the noise figure analyzer. The noise figure meter, such as Agilent N8973A Noise Figure Analyzer, generates a 28VDC pulse signal to drive a noise source (HP346A/B), which generates noise to drive the device under test (DUT). Noise Figure Meter/Analyzer is employed as shown in Figure 1. In this article, a Noise Figure Meter as well as two other popular methods - "gain method" and "Y factor method" - will be discussed. Measurement methods have to be chosen carefully. As shown in the table above, some applications have high gain and low noise figure (Low Noise Amplifiers under HG mode), some have low gain and high noise figure (mixers and LNAs under LG mode), some have very high gain and wide range of noise figure (receiver systems). Measurement methods vary for different applications. * HG = High Gain Mode, LG = Low Gain Mode Below is a table of typical RF system Noise Figures: Category The basic definition is:įrom this definition, many other popular equations of the Noise Figure (Noise Factor) can be derived. Noise Figure (Noise Factor) contains the important information about the noise performance of a RF system. Noise Figure (NF) is sometimes referred to as Noise Factor (F). This tutorial discusses this important parameter in more detail and describes three different noise figure measurement procedures. The lower the value of noise figure, the better the performance. In wireless communication systems, the "noise figure (NF)" or the related "noise factor (F)" is a number used to specify the performance of a radio receiver. The three approaches are compared in a table. Three different methods to measure noise figure are presented: Gain method, Y-factor method, and the Noise Figure Meter method.
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