File:RF Intermodulation at 280 MHz.jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file (954 × 731 pixels, file size: 94 KB, MIME type: image/jpeg)

Captions

Captions

Intermodulation distortion spectrum sample

Summary

[edit]
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

Licensing

[edit]
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.
w:en:Creative Commons
attribution share alike 		This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
This licensing tag was added to this file as part of the GFDL licensing update.

Original upload log

[edit]
The original description page was here. All following user names refer to en.wikipedia.
  • 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-

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current09:20, 5 July 2022Thumbnail for version as of 09:20, 5 July 2022954 × 731 (94 KB)Myzhang1029 (talk | contribs)Uploaded a work by Nader Moussa from https://en.wikipedia.org/wiki/File:RF_Intermodulation_at_280_MHz.jpg with UploadWizard

You cannot overwrite this file.

There are no pages that use this file.

File usage on other wikis

The following other wikis use this file:

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:RF_Intermodulation_at_280_MHz.jpg&oldid=920876977"