circuit's name?

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#1
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I attached a picture, part of some circuit, and I wonder is there a name of it. And what is its function?

The two input lines on the left side i believe they get the signal which were distinguished to each other. Like on and off status but not as 0v and 5v, as we used to see.

Look like it's a band pass filter

Is anyone know?

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"Chill out with Atmel Corp."
- Scud88.

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have u tried to simulate it, in orcad or something.?

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Definitely band pass. Nothing through at zero frequency (C29,C28). Nothing through at infinite frequency (L1,L2). Min loss where C28 and L1 (and C29/L2) resonate.

It is designed for a differential circuit, differential in, differential out. There is nothing that has any effect on common-mode signals, at all.

So, I would just call it "differential band-pass filter"

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

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Not a double pi-filter or double T-filter? (from HF area)

:?

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HF: Antenna impedance matching (and filter as RoBski notes), transforming from a low impedance differential output to a higher impedance differential load (the antenna).
C28/C29 are somewhat large but not unrealistic. Hard to say without seeing what's driving it.

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Agree with KKP. And, yes, functionally, it may be used as an impedance matching network. It might be called a "balanced-L" network as it is neither pi nor T. As noted, it is hard to name it without knowing more about how it is used.

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

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great!

I'll try looking into those you had mentioned

"Chill out with Atmel Corp."
- Scud88.