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Summary

Description
English: Stanford University High Frequency Electronics Laboratory

Frequency Spectrum of intermodulation distortion in a radio-frequency signal passed through the linear broad-band amplifier I built. The process of intermodulation is due to third-order harmonics of closely spaced signals. I tested this phenomenon with two signals: a Local Oscillator (LO) at 270 MHz, +0dBm, and an RF signal at 275 MHz. (Closer spacing would push the limitations of the RF spectrum analyzer resolution). Clear intermodulation products were seen at 265 and 280 MHz. As seen on the attached graph, the intermodulation power is 55.66 dB lower than the signal power.

This graph nicely shows our desired signal peaks, as well as the side-band intermodulation. These closely spaced distortions would likely interfere with our signal, since it would be difficult to build a high-quality filter to cancel them out in our application. However, their overall power is more than 50 dB below the desired signal, which was sufficiently low for our purposes. We used this measurement to estimate the IP3 (third order intercept point) parameter.
Date
Source Created by Nader Moussa, in the EE344 High Frequency Electronics Laboratory at Stanford University
Author Nader Moussa

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GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
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  • 2008-06-22 16:29 Nimur 954×731× (96536 bytes) {{Information |author=Nader Moussa |source=Created by me, in the EE344 High Frequency Electronics Laboratory at [[Stanford University]] |date=[[1 November]] [[2006]] |location=[[Stanford University]] High Frequency Electronics Laboratory |description=Freq
  • 2008-05-22 16:02 Nimur 1168×850× (96291 bytes) {{Information |author=Nader Moussa |source=Myself |date= |location=[[Stanford University]] High Frequency Electronics Laboratory |description=Frequency Spectrum of [[intermodulation]] distortion in a radio-frequency signal passed through the linear broad-

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Intermodulation distortion spectrum sample

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1 November 2006

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current09:20, 5 July 2022Thumbnail for version as of 09:20, 5 July 2022954 × 731 (94 KB)Myzhang1029Uploaded a work by Nader Moussa from https://en.wikipedia.org/wiki/File:RF_Intermodulation_at_280_MHz.jpg with UploadWizard

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