Feb 12
22
Pole Saw Operations
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Single-pole resonators using SAW cavities were first proposed in 1970. [1, 2] By the mid 1970’s, single-pole resonators were becoming practical and multi-pole SAW CR filters were shown to be feasible. [3, 4] In the early 1980’s, CR filters of up to six poles were emonstrated [5–7] and twopole SAW CR filters turned quickly available in range and at affordable cost. SAW CR filters at wavelengths as high as 1500 MHz were shown in the mid 1980’s.
In spite of the understanding of SAW CR filter features in the ultrasonics community and the availability of realistic devices in manufacturing volumes, this specific technology is still not well known among RF circuit and system designers.A surprisingly large percentage of RF design engineers seem unaware of the capabilities presently available and the design possibilities made viable by this technology.
SAW CR filters possess narrow bandwidths (typically 0.03% to 0.6%), low insertion losses (as low as 2 dB), and good ultimate rejection without harmonic spurious responses.Combined with center frequencies up to 1650 MHz, this type of filter is ideal for many consumer, industrial, and military applications in signal selection and frequency control. In addition, SAW CR filters often offer the smallest size and lowest unit cost of any of the alternatives.
In this application note, a brief overview of basic SAW CR filter concepts is followed by a description of current practical performance capabilities important to the RF design engineer. The capabilities of SAW CR filters are then compared with other passive bandpass filter technologies with an emphasis on optimizing the selection process at the system Theory of operation is not the subject of this application
note. However, a very brief review and description of the basic concepts is in order as a point of reference for the RF design engineer
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