I'm reading up a little on ceramic resonators and I stumbled into some rather good resources
https://ecsxtal.com/news-resources/...nical-guides/127-ceramic-resonator-principles
https://www.mouser.com/ds/2/281/p17e14-188039.pdf
then if you search the online open markets
https://www.aliexpress.com/wholesale?SearchText=ceramic+resonator
you would find a variety of 2 pin and 3 pin types
accordingly 3 pin types is equivalent to simply having the caps to gnd at the terminals embedded - possibly the center pin is gnd
https://electronics.stackexchange.com/questions/524429/16mhz-ceramic-resonator-3pin-vs-2-pin
next I looked at some graphs / charts
https://ecsxtal.com/news-resources/...nical-guides/127-ceramic-resonator-principles
I think I've seen such charts (these are the most precise / characteristic yet).
Now I've a question:
If i use a ceramic resonator as a bandpass filter,
- I'd assume it 'resonates' at Fr which is the low impedance point?
- these charts now stirs lots of question in a sense that lets say I've a rf mixer prior this say a sa602 double mixer
https://www.nxp.com/docs/en/data-sheet/SA602A.pdf
and I make target the difference frequency (IF) of 455 khz
do this ceramic resonator in effect *band pass* the IF of 455 khz?
the charts are at least surprising as it implies that some other high frequencies could be present at the output
- the other thing is this is highly non-linear, it would seem that frequencies lower than and higher than Fr would be attenuated by very different levels.
at Fr lowest impedance, it implies this is the highest at the output (band pass), but frequencies lower and higher are attenuated differently, e.g. a frequency closer to Fa would be pretty much supressed, then higher frequencies are let through the filter again (non-linear)
while the lower frequencies are attenuated as well but following very different curves
so if one is trying to decode FM (frequency modulated signnals) centered around Fr, any thing closer to Fa is supressed, then varying signals, higher and lower frequencies still can be seen in the output and attenuated to different extent.
how would this in effect be the demodulated / detected signal?
https://ecsxtal.com/news-resources/...nical-guides/127-ceramic-resonator-principles
https://www.mouser.com/ds/2/281/p17e14-188039.pdf
then if you search the online open markets
https://www.aliexpress.com/wholesale?SearchText=ceramic+resonator
you would find a variety of 2 pin and 3 pin types
accordingly 3 pin types is equivalent to simply having the caps to gnd at the terminals embedded - possibly the center pin is gnd
https://electronics.stackexchange.com/questions/524429/16mhz-ceramic-resonator-3pin-vs-2-pin
next I looked at some graphs / charts
https://ecsxtal.com/news-resources/...nical-guides/127-ceramic-resonator-principles
I think I've seen such charts (these are the most precise / characteristic yet).
Now I've a question:
If i use a ceramic resonator as a bandpass filter,
- I'd assume it 'resonates' at Fr which is the low impedance point?
- these charts now stirs lots of question in a sense that lets say I've a rf mixer prior this say a sa602 double mixer
https://www.nxp.com/docs/en/data-sheet/SA602A.pdf
and I make target the difference frequency (IF) of 455 khz
do this ceramic resonator in effect *band pass* the IF of 455 khz?
the charts are at least surprising as it implies that some other high frequencies could be present at the output
- the other thing is this is highly non-linear, it would seem that frequencies lower than and higher than Fr would be attenuated by very different levels.
at Fr lowest impedance, it implies this is the highest at the output (band pass), but frequencies lower and higher are attenuated differently, e.g. a frequency closer to Fa would be pretty much supressed, then higher frequencies are let through the filter again (non-linear)
while the lower frequencies are attenuated as well but following very different curves
so if one is trying to decode FM (frequency modulated signnals) centered around Fr, any thing closer to Fa is supressed, then varying signals, higher and lower frequencies still can be seen in the output and attenuated to different extent.
how would this in effect be the demodulated / detected signal?
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