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!
Innovative Power Products Couplers

Ideal Balun ADS - 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

mike

Post subject: Ideal Balun ADS Posted: Thu Dec 29, 2005 5:11 pm

Hello guys:

What's the component for IDEAL balun in ADS...there are a few and i'm not sure which one to use. I need to convert both ways....single to diff. and diff. to single. The components I found are:

Balun1 found under Passive-RF Circuit palette

Balun2 found under Passive-RF Circuit palette

Balun3 found under System-Passive palette

Balun4 found under System-Passive palette

Balun1 and Balun2 don't seem ideal because they involve transmission line parameters and frequency parameter. Balun1 and Balun2 seem to be for diff. to single conversion but again they don't seem ideal.

Balun3 seems like single to differential but Balun4 has differential ports on both sides. I can use Balun3 for single to diff. conversion but what about diff. to single conversion? Do you use Balun4 for that but it has diff. ports on both sides....should i just connect my diff. signal on one side and take out the unbalanced signal from the other side leaving one port 'open'??? Is there any other balun component in ADS??

Top

mike

Post subject: Posted: Thu Dec 29, 2005 6:55 pm

Any response?? I thought I might try Balun3. Is it ok if I use Balun3 component in ADS like the image below. also, should this setup give me matched condition to 50 Ohm. I ran the simulation and didn't get exact match to 50 Ohms so I was wondering if something is wrong here with the balun setup. also does any one know how to use zin() function within the schematic in ADS. thanx

Top

Rod

Post subject: Posted: Sat Dec 31, 2005 2:15 am

I believe the 2 outputs should be 25ohms.

Rod

Top

DisAgree

Post subject: Posted: Tue Jan 03, 2006 7:26 am

No, I think your setup is correct...you specify an impedance for the ideal balun: i.e. Zo=50 and this will set each port to 50 ohms. since one port is grounded on the single ended side, you will terminate the other port to 50 ohms....that's what i think

JR

Top

Rod

Post subject: Posted: Wed Jan 04, 2006 3:21 am

Well, I think you're wrong. For the same reason a power splitter requires a 2:1 tranformer at it's intput.

If the BALUN was being used with a balanced output it would require a single 50ohm resistor from output+ to output-. That's because it's a 1:1 balun.

ohhh SNAP!

Top

Rod

Post subject: Posted: Thu Jan 05, 2006 2:35 am

What's the matter? Is that all you got?

You're lucky there's a Moderator here!

Top

Rod--ChillOut

Post subject: Posted: Sat Jan 07, 2006 11:52 am

Hi Rod,

No need to fight here although. DisAgree and you're on the wrong page.

This setup will not match as it is given (and will match if 25 Ohms each is on the differential side) but I think the guy wanted to know about ideal Balun in general and I think his setup would not correctly tell what the Balun is doing because he's grounding the differential side impedances. Isn't that right? If there was an actual balanced output and each side of the balanced output was matched to 50 Ohms and then an ideal balun was used to convert the balanced to single ended then I think you will terminate it in 50 Ohms and not 100 Ohms.

So, the setup shown by the guy, yes it's wrong and will not match unless impedance on the differential side sums up to 50 but I think the guy was asking what would actually happen if one tries to convert a balanced output that has its each side matched to 50 Ohms to single ended. In that case you do terminate in 50 Ohms. Rod your thoughts welcomed!!

Top

Rod

Post subject: Posted: Mon Jan 09, 2006 1:08 pm

I'm sorry, I'm just extremely sensistive. I am also right!

Top

Solomon

Post subject: Posted: Mon Jan 09, 2006 2:16 pm

Hi guys. I have an opinion, but shan't present it here because level heads do not prevail. Here's a simple empirical solution to determine who is correct:

Connect a 50 ohm source to TERM2 and look at the VSWR with 50 ohms on each of the differential ports, and then with 25 ohms on each differential port. Whichever setup results in a 1:1 VSWR wins.

Top

rod

Post subject: Posted: Mon Jan 09, 2006 2:34 pm

Yeah, you can do that if you want to burn precious calories.

Mike already mentioned in his second post he was not seeing a good match.

You guys need to lighten up and just admit..YOU GOT SERVED!

Posted  11/12/2012

TotalTemp Technologies (Thermal Platforms) - RF Cafe
RF Electronics Shapes, Stencils for Office, Visio by RF Cafe
Anatech Electronics (RF Filters) - RF Cafe
Lotus Communication Systems Modular RF Component Building Blocks - RF Cafe
Innovative Power Products Passive RF Products - 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