Guide to Spectrum and Signal Analysis

Guide to Spectrum and Signal Analysis
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Guide to Spectrum and Signal Analysis

  • www.anritsu.com | 15Distortion products are produced in the analyzer whenever a signal is applied to the input. These distortion products are usually produced by the inherent nonlinearity of the mixer. By biasing the mixer at an optimum level internal distortion products can be kept to a minimum. Typically, modern spectrum analyzer mixers are specified as having an 80 dB spurious free measurement range for an input level of –30 dBm. Obviously the analyzer will be subjected to input signals greater than –30 dBm and to prevent exceeding the 1 dB compression point, an attenuator is positioned between the analyzer input and the first mixer. The attenuator automatically adjusts the input signal to provide the –30 dBm optimum level.Figure 15+30 dBm Damage Level–10 dBm < 1 dB Gain Compression–30 dBm Max Input for Specified Distortion–110 dBm Noise Level (10 kHz BW)–120 dBm Noise Level (1 kHz BW)–130 dBm Noise Level (100 Hz BW)–140 dBm Noise Level (10 Hz BW)Optimum Operating Range(80 dB, Spurious-FreeTotalMeasurementRangeFigure 16P inP out1 dB