who can tell me what's balun ? thanks.

[vivsim]

balun, if it's a transfer ?
thanks .

 

[FoxyRick]

BalUn = Balnced / Unbalanced

A balun is a device that joins a balanced line (one that has two conductors, with equal currents in opposite directions, such as a twisted pair cable) to an unbalanced line (one that has just one conductor and a ground, such as a coaxial cable). A balun is a type of transformer: it's used to convert an unbalanced signal to a balanced one or vice versa. Baluns isolate a transmission line and provide a balanced output. A typical use for a balun is in a television antenna.

In a balun, one pair of terminals is balanced, that is, the currents are equal in magnitude and opposite in phase. The other pair of terminals is unbalanced; one side is connected to electrical ground and the other carries the signal.

https://www.qsl.net/iz7ath/web/02_brew/11_balun/pag01_eng.htm

https://en.wikipedia.org/wiki/Balun

Google is your friend

FoxyRick.

 

[vivsim]

thanks.
another question is if balun can be integrated in a IC ?

thanks.

 

[the_risk_master]

A simple answer would be a device that couples balanced transmission lines to unbalanced transmission lines or vice versa.

I think theres no IC of a Balun

 

[aandrew]

A balun is a device designed to convert between balanced and unbalanced electrical signals, such as between coaxial cable and ladder line. Baluns can be considered as simple forms of transmission line transformers.

 

[jallem]

Johanson Technology has some baluns:
https://www.johansontechnology.com/products/rfc/blct/

 

[mkhafaji]

Balun is used now in integrated circuits to convert a single signal to differential signal in the input of chip (like for LNAs) it is implemented az two coupled transformers

 

[kender]

Question

There are mass produced baluns for hundreds of MHz. I'm looking for a balun for 100kHz. Will a balun rated for higher frequency work at a much lower frequency (assuming the same current)?

 

[sinip]

Re: Question

There are mass produced baluns for hundreds of MHz. I'm looking for a balun for 100kHz. Will a balun rated for higher frequency work at a much lower frequency (assuming the same current)?

No it will not work, especiallz on such a big diferrence between frequencies...

 

[kender]

Re: Question

There are mass produced baluns for hundreds of MHz. I'm looking for a balun for 100kHz. Will a balun rated for higher frequency work at a much lower frequency (assuming the same current)?

No it will not work, especiallz on such a big diferrence between frequencies...

How can I calculate the balun parameters? I have a receiving antenna with biult-in LNA that outputs a differential 100kHz signal. I want to convert it to single-ended. Right now it's done with an instrumentation amp (the low frequency allows it), but I think that balun is a "cleaner" solution. I have never designed magnetics before. Could anyone help me design a balun or point me to the article that describes how to design one?

Thanks!
Kender

 

[janet]

balun can be used to generate differential signals

 

[jallem]

For 100 KHz a trasnformer will do the job

 

[kender]

Re: Question

For 100 KHz a trasnformer will do the job

Do you mean the kind of transformer used in power supplies to step down 220AC? If it's not too much hassle, could you tell me a certain transformer model that would work?

 

[jallem]

Probably the kind used for 220 VAC is too much for your aplication.
The reason is, we are talking about a power transformer, it is designed
to handle a lot of power and consequently it is bulky(big). But in essence
a balun is just a device which transform +V (referenced to ground) into
+V/2 and -V/2 referenced to a common point ( the center tap in the case
of transformer). It is just like transforming from single ended to
diferential (just another name for the same). It is just like differential
op-amp, the same concept.......