Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Forums Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Bittele Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol RF Superstore San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!
PCB Directory (Manufacturers)

Noise from a Class C Amplifier - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2010 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts.

NOTICE: The original RF Cafe Forum is available again for reading, and the new RF Cafe Blog is an active board.

-- Amateur Radio

-- Anecdotes, Gripes, & Humor

-- Antennas

-- CAE, CAD, & Software

-- Circuits & Components

-- Employment & Interviews

-- Miscellany

-- Swap Shop

-- Systems

-- Test & Measurement

-- Webmaster

Michael

Post subject: Noise from a Class C Amplifier Posted: Fri Jan 27, 2006 10:37 am

Good day.

This might be a simple question, but I need some assistance. I am looking at the noise generated by a Class C amplifier (to keep things simple, lets assume it is has a 10 watt amplifier) and how to measure it.

Also I would like to know if anyone has some suggestions about how to analyze the noise (instead of measuring it, can I perform some calculations and get an approximate answer?)

Finally, has anyone tried to simulate the noise from a Class C amplifier?

Any information will be appreciated - websites, magazine articles, books, etc.

Thank you

Michael

Top

IR

Post subject: Posted: Sun Jan 29, 2006 11:54 am

Site Admin

Joined: Mon Jun 27, 2005 2:02 pm

Posts: 373

Location: Germany

Hello Michael,

You can measure the output noise of the PA by using Spectrum Analyzer. You first have to measure the output noise when the PA is off, this result will be used as reference point, you have to know the temperature at which it was measured. Then turn on the PA and notice that the noise floor is increased. Make these measurements at the same RBW.

The difference between the noise floors at both cases is the gain of the noise + PA´s Noise Figure. Of course that the noise is also dependent on the BW of operation (RBW of the SA in this case) and the temperature according to: Pn=kTB

After this calculation, you can deduce the self-contribution of the PA to the noise measured.

Good luck!

_________________

Best regards,

- IR

Posted  11/12/2012

Anatech Electronics - RF Cafe
Berkeley Nucleonics Corporation - RF Cafe
Exodus Advanced Communications Best in Class RF Amplifier SSPAs
Holzworth RF Synthesizers
Amplifier Solutions Corporation (ASC) - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free

 

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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:

AirplanesAndRockets.com