GDF
Full Member level 3
saw filter matching
I have a 1.5GHz SAW filter with 20MHz BW for channel selection, I have to match
it if I want to get correct filter response.
1) My question is do I need to do wideband matching which means the
50 ohms mathcing over wide frequecy range such as 0.5G~2.5GHz
or I only need to match it over narrow band 1.4G~1.6GHz?
2) If I do the narrow band matching, how do I guarantee the outband response,
for example the attenuation at 3GHz?
Anybody have the idea about this?
I have a 1.5GHz SAW filter with 20MHz BW for channel selection, I have to match
it if I want to get correct filter response.
1) My question is do I need to do wideband matching which means the
50 ohms mathcing over wide frequecy range such as 0.5G~2.5GHz
or I only need to match it over narrow band 1.4G~1.6GHz?
2) If I do the narrow band matching, how do I guarantee the outband response,
for example the attenuation at 3GHz?
Anybody have the idea about this?