Sorry if I come back to the subject. I found an RF transformer that might be right for me. Its function will be to supply 180 ° inverted signals on the two secondary outputs. I also chose this for the THT and it makes soldering easier.

SWB2010-1-PCL

https://www.mouser.it/datasheet/2/597/swb-1223867.pdf

The question is can I expect the same output voltage as the input voltage? I couldn't find an ideal model to at least test it with LTSPice.


Mod: link to other Thread.E
https://forum.allaboutcircuits.com/threads/interstage-rf-trasformer.181104/post-1656367

 

Check out the frequency response chart for the transformer in which you are interested. Attenuation of 0 db means to measurable loss, 1 db means 11% attenuation. The charts are in the datasheet.

 

So if there is no attenuation, I should expect the same output voltage. I used another simulator. To get the same output voltage I have to use a 1: 2 ratio and now I still have the doubt.

 

hi, Dani
What are the source and load lmpedances
E

 

Hi Eric,

It is mounted between two Jfet stages. Input voltage approximately 220mV Between the input JFet and the primary of the transformer, there is also a 100p capacitor in series and subsequently a 1MOhm resistor to ground. The secondaries go (one at a time) to the gate of the next JFet stage always with a 1MOhm resistance to ground.

 

hi Dani,
So what's your best estimate [ guess] on the two impedances at that operating frequency.?

A high to low impedance transfer is indicated if the signal I/O ratio is showing as 2:1

E

 

Actually, I use a 10Mhz for simulate. Being used between two JFets, wouldn't it be correct to use a 1: 2 ratio anymore? Where 1 is the output stage of the first stage and 2 is the input stage of the next JFet stage?