Thank you for visiting RF Cafe! Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Forums RF Cafe Homepage Thank you for visiting RF Cafe!

Mixer SSB and DSB Conversion Loss and NF - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

Post subject: Mixer SSB and DSB conversion loss and NF
Unread postPosted: Fri Dec 24, 2004 5:22 pm

Hi All,

I read in an application note that there is a difference of 3dB between SSB noise figure and conversion loss of a mixer to these paramaters in DSB (conversion loss of SSB is 3dB higher than DSB).

If you input DSB (Dual Side Band) signal with twice as power as SSB signal to a given mixer you will obtain twice as power at the output as well. And if you input the SSB signal to that mixer the ratio of power in the input and output should remain the same (only with 3dB less in the aboslute values at each port) - please correct me if I am wrong!

My question is why is this difference?


- IR


Post subject: Mixer Noise Figure
Unread postPosted: Mon Dec 27, 2004 2:36 pm

The double side band has twice the power level , therfore the signal to noise ratio at the output is 3dB higher. In a SSB mixer, half the power is at the output, but the same noise power. The signal to noise ratio is 3dB lower. Therefore, the noise figure is 3dB higher.

Posted  11/12/2012

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
Kirt Blattenberger,

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !