On 4/1/21 4:49 PM, Bob kb8tq wrote:
Hi
At least back when I did it for a living …. the SAW you used
for an oscillator was a bit different than the one you used for
an oscillator. The “normal” problem was coming up with
enough tune range cover the (massive) TC plus the aging.
Bob
Yeah, for filters, SAW devices are awesome. You've got a lot of control
over the passband and stopband shape. And they are cheap to make (at
least for ordinary aluminum transducers on the substrate, with no ion
milling).
for resonators - the big TC is an issue. And I don't know how high the Q
can be. I worked for a place that used SAW resonators (on quartz) as
sensors for all kinds of things (a multitude of SBIRs) - pressure,
chemical presence, etc. you name it. Bend the quartz or change the mass
loading, and the frequency changes, in a fairly repeatable way. They
make a nice detector for the output of a Gas Chromatograph for instance
- they're basically sensing mass, so they don't have poisoning problems
like some others.
On Apr 1, 2021, at 7:40 PM, Gerhard Hoffmann <[email protected]>
wrote:
OOps, the 400 MHz filter is
<
https://www.digikey.de/product-detail/de/qualcomm-rf360-a-qualcomm-tdk-joint-venture/B39401B3742H110/495-3923-1-ND/1858979
>
Gerhard
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