How to use a Lange-coupler with amplifiers ?

[StoppTidigare]

Info on Lange coupler ?

Hi all, I need some info about how to use a Lange-coupler with amplifiers.

I know that a Lange coupler is a for port device, 1 input port, and one isolated and two ports to where the power is splitted equally.

The exercise for me is to "construct a balanced amplifier using the same transistor as in exercise ..."

This confuses me, because how can I make a balanced amplifier with only one transistor ?

I guess that the teacher used the word "balanced" in the wrong way.
I believe that he meant that the power to two transistors should be equal (balanced). Power is splitted equally to each transistor and combined at output.

Am I wrong or is it another way to use the Lange-coupler ?

Kindest Regards,
StoppTidigare

 

[sergio mariotti]

For my opinion, your teacher mean "use many trasistor you need whit the SAME PART/NUMBER"

 

[yuppi77]

Hi StoppTidigare,

I would have the same opinion as what you think. From the exercise quoting ""construct a balanced amplifier using the same transistor ..." , I would understand it as the i/p power to the two amplifiers should be balanced.

 

[AL0117]

Re: Info on Lange coupler ?

Hi,

here is a link to an example of a balanced amplifier using a Lange coupler:

hxxp://www.xpedion.com/pdf_files/SATCOM.pdf

rgds, Al

 

[qiang]

Re: Info on Lange coupler ?

I think the meaning of your teach is that the transistors you used have the same performance