How to calcul balanced matching circuit

Thread Starter

BRUNET Joss

Joined Nov 1, 2018
22
Hello everybody,

I would like some advices on balanced matching circuit utilisation. Today, my goal has to use in series a MRF136Y and a D1008UK with a wide-band working (from 40 MHz to 400 MHz) but I obtain some problems of impedance between.

After the MRF136Y, I use a transformer to obtain an unbalanced 50 Ohms output and after, I use a guanella transformer to attack the D1008UK but I think that it exist an easier method that my method. But which ?

upload_2018-11-28_18-47-18.png

Secondly, I don't understand the input stage (balanced matching network ?) of the D1008UK application note shematic (cf picture), I'm looking for some explications.

upload_2018-11-28_18-49-51.png

Have a good day!

Joss
 

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cariban

Joined Aug 14, 2018
68
Hello everybody,

I would like some advices on balanced matching circuit utilisation. Today, my goal has to use in series a MRF136Y and a D1008UK with a wide-band working (from 40 MHz to 400 MHz) but I obtain some problems of impedance between.

After the MRF136Y, I use a transformer to obtain an unbalanced 50 Ohms output and after, I use a guanella transformer to attack the D1008UK but I think that it exist an easier method that my method. But which ?

View attachment 164583



Secondly, I don't understand the input stage (balanced matching network ?) of the D1008UK application note shematic (cf picture), I'm looking for some explications.

View attachment 164584

Have a good day!

Joss
The 100 pF capacitors are just used as DC-blocking purpose. Only L1 is used for impedance matching.
 

Thread Starter

BRUNET Joss

Joined Nov 1, 2018
22
Ok, thank you Cariban. I'm looking for method, to realize retro-engineering on L1, to know his utility and adapt his value for my application.
 
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