EvilmonkeyzDesignz | Inside a SAW filter @EvilmonkeyzDesignz | Uploaded March 2024 | Updated October 2024, 3 hours ago.
Let’s take a look at a SAW filter.
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In this context, SAW stands for Surface Acoustic Wave. This particular part is one that I’ve opened previously in the past, and is actually number 196 in the #ComponentsCloseUp series.
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As stated in the video, this SAW filter is made using a large piece of quartz with some circuits on it. The main components of these circuits are in the form IDTs, or Interdigital Transducers, which are made up of hundreds of tiny lines. The IDTs on either side of the device are not physically connected to each other.
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An ultra-simplified explanation of how they work would be as follows. A standing wave is generated on one end of the device by the IDT from an incoming signal, which is then propagated across the surface of the quartz, thanks to its piezoelectric properties. The propagated wave is then collected by another IDT as the output. SAWs are often used to filter out unwanted frequencies to only leave desired ones.
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I would highly recommend the Wikipedia page titles “Surface acoustic wave” and "Interdigital Transducers" for more information.
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Surface Acoustic Wave:
en.wikipedia.org/wiki/Surface_acoustic_wave
Interdigital Transducer:
en.wikipedia.org/wiki/Interdigital_transducer
Let’s take a look at a SAW filter.
-
In this context, SAW stands for Surface Acoustic Wave. This particular part is one that I’ve opened previously in the past, and is actually number 196 in the #ComponentsCloseUp series.
-
As stated in the video, this SAW filter is made using a large piece of quartz with some circuits on it. The main components of these circuits are in the form IDTs, or Interdigital Transducers, which are made up of hundreds of tiny lines. The IDTs on either side of the device are not physically connected to each other.
-
An ultra-simplified explanation of how they work would be as follows. A standing wave is generated on one end of the device by the IDT from an incoming signal, which is then propagated across the surface of the quartz, thanks to its piezoelectric properties. The propagated wave is then collected by another IDT as the output. SAWs are often used to filter out unwanted frequencies to only leave desired ones.
-
I would highly recommend the Wikipedia page titles “Surface acoustic wave” and "Interdigital Transducers" for more information.
-
Surface Acoustic Wave:
en.wikipedia.org/wiki/Surface_acoustic_wave
Interdigital Transducer:
en.wikipedia.org/wiki/Interdigital_transducer
