Yes.1. are the caps and inductors for the purpose of impedance matching?
BAW requires 50ohm terminations at both sides.If yes, is it still necessary to design the 50 ohm impedance trace at indicated location?
What do you mean by "50 ohm trace design impedance matching" ?2. What is the difference of LC impedance matching and 50 ohm trace design impedance matching?
If you mean "signal integrity" as spurious emission, for both.3. is the impedance matching for signal integrity or max power efficiency, or for both?
To make small filter.4. The BAW filter will change electrical signal to acoustic signal, what is the purpose of such conversion?
Rather broadband is difficult.And how to realize narrow bandpass fitering with BAW?
Still need impedance matching, since BAW requires 50ohm terminations at both sides.5. If all the traces are very short, e.g less then 1cm, still need impedance matching or not?
Yes.
BAW requires 50ohm terminations at both sides.
What do you mean by "50 ohm trace design impedance matching" ?
If you mean "signal integrity" as spurious emission, for both.
To make small filter.
Consider wavelength of 1GHz as both electrical and acoustic signals.
Latter is very short.
Rather broadband is difficult.
Still need impedance matching, since BAW requires 50ohm terminations at both sides.
If line length is enough short, e.g, less than λ/10, 50 ohm characteristic impedance line is not required.what I mean by 50 ohm trace design is to design a 50 ohm characteristic impedance trace in the PCB for that rf signal
Completely different.2. What is the difference of LC impedance matching and 50 ohm trace design impedance matching?
BAW requires 50ohm terminations at both sides.
5. If all the traces are very short, e.g less then 1cm, still need impedance matching or not?
However, the BAW itself is usually not matched to 50 Ohm. The 50 Ohm are obtained by BAW + matching components.
This means that internal 50 Ohm line between BAW and matching components is not correct anyway, the interface to 50 Ohm is outside the [BAW + matching] block.
View attachment 148973
What frequency? Impdenace controlled transmission lines have an effect when the line length is > 1/10 wavelength. Wavelength must be calculated including the substrate influence.
No.However, the BAW itself is usually not matched to 50 Ohm.
The 50 Ohm are obtained by BAW + matching components.
No.This means that internal 50 Ohm line between BAW and matching components is not correct anyway, the interface to 50 Ohm is outside the [BAW + matching] block.
Operation frequency.What frequency?
You can not understand BAW at all.So now I understand BAW's RX/TX and Antenna port is not designed to have 50 ohm impedance, thus needs external matching elements(caps and inductors) to achieve so.
Need LC match for BAW's I/O ports.But if I say the signal line is less than 1cm, signal frequency is 2.4GHz, so we do not need LC match for BAW's I/O ports
LC elements are required.Or still need because even though signal integrity is not a problem,
but we need to maximize the power efficiency, both LC elements and PCB trace design are needed even signal line is very short?
Volker's explanations are completely wrong.
Of course, sweetheart. You are the only true expert. Good luck!
Ask @pancho_hideboo for an answer.
He is behaving like that in all his threads.
I'm no RF/uWave expert like some of the people here, but pancho needs to learn some manners. Being this rude all the time to everyone is not sustainable.
EDABOARD managers turn a blind eye to his behavior and nothing can be done in this case unfortunately.
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