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September 2006 [Commercial] White Paper: Achieve Improved Spectrum Analyzer Amplitude Accuracy A swept-tuned superheterodyne spectrum analyzer (Fig. 1) mixes input signals with a local oscillator (LO) with signal amplification, filtering, and detection performed at intermediate frequencies (IFs). The preselector filter (sometimes a lowpass filter) prevents high-frequency signals from reaching the mixer and mixing with the LO. The reference level shown on the spectrum analyzer's display is adjusted by the level of... |
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