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!
withwave microwave devices - RF Cafe

PA - 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

sofialebbar

Post subject: PA Posted: Fri Jun 17, 2005 7:50 am

am new in microwave power amplifiers.

I can build the system using couple of tranistors , capacity and inductors .

the probleme is how we can find the transistor model that we need to use .

and how we can find the system layout using ADS

please answer at

maha201177@yahoo.com

Top

Jeanalmira

Post subject: Posted: Sun Jun 19, 2005 9:07 pm

General

Joined: Tue Mar 15, 2005 11:43 pm

Posts: 65

Location: Singapore

Hi:

For choosing transistors for RF PA, you need to consider the specifications of the PA, such as how much gain are you needed, how much power and linearity to be achieved. and whether it's single-stage or multi-stages PA?

For example, at multi-stages PA, usually we use high-impedance transistor at first stage and low impedance transistor at last stage. The high impedance gives us lower input reflection with simpler input and interstage matching networks .

While the high impedance at the last stage (output side) will give us some room for power matching at the end.

and also , you may consider the gain you need, and check the GMax of the transistors, and see whether it is possible to achive certain gain.

If you could provide me more details, I might be able to help you.

Hope it helps,

Regards,

Jean

Top

sofialebbar

Post subject: PAPosted: Wed Aug 10, 2005 3:54 pm

thanks alot for answering my request .and sory for not responding earlier n that time

in fact my problem is when designing the PA , i needed to choose a model for my FET transistors (am using ADS software), and i don't have one.so do u need any place were i can telecharge the library that i will need .

thanks alot for all

Top

sos

Post subject: Posted: Thu Aug 11, 2005 7:31 pm

You can visit some transistor supplier for more infor: advanced power technologies RF, macom or philip...

You can find more info by talking to their application engineers....good luck to you

Posted  11/12/2012

DC-70 GHz RF Cables - RF Cafe
KR Electronics (RF Filters) - RF Cafe
Exodus Advanced Communications Best in Class RF Amplifier SSPAs
Windfreak Technologies Frequency Synthesizers - RF Cafe
Triad RF Systems Amplifiers - 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