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# Transmission Line Transformer Balun

#### ge

##### Full Member level 5
1) Could someone suggest a reference to more detailed explain a balun? I'm reading through Jerry Sevick's book Transmission Line Transformers. On page 1-4, he says "By connecting a ground to terminal 5, a negative potential gradient -(V1-V2/2) is established from terminal 3 to 4 and -V2/2 from terminal 1 to 2.
This is likely true, but why is it true?

2) At the bottom of page 1-4, Boot-Strap. What is meant by "Boot-Strap"?

I don't know about any of these questions, but "Marchand balun"
found me a lot of realted stuff back when I was looking for it.

Scratch request. I need to keep reading.

Agreed. I think the book is pretty clear.
What is meant by "Boot-Strap"?
The term has different meanings in electronics. Here it's about connecting a voltage source on top of another voltage to increase the voltage level.

ge

### ge

Points: 2
The analysis is quite simple. If the node 5 is conneccted to ground, the voltage V45=V52=V2/2

From KVL: V31=V34+V45, where node 1 is connected to ground, then

V34=V1-V2/2

SInce node 1 is connected to ground, then: V21=V2/2

About the bootstrapping, it's a method to rise the output voltage by adding some of the input voltage. See:

ge

### ge

Points: 2
The analysis is quite simple. If the node 5 is conneccted to ground, the voltage V45=V52=V2/2

From KVL: V31=V34+V45, where node 1 is connected to ground, then

V34=V1-V2/2

SInce node 1 is connected to ground, then: V21=V2/2

About the bootstrapping, it's a method to rise the output voltage by adding some of the input voltage. See:

Hi albbg,
>>
V45=V52=V2/2
I'm good with that.
From KVL: V31=V34+V45
Where did the drops V52 and V21 go? ... oops, I now see. "Both" V1 and V5 is grounded.