PAFC243B Filters

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SAW filters are composed of resonators, which are combined to form a band pass filter. The PAFC243B SAW filter is a three-port band pass filter designed for use in FM portable radios. It features a low insertion loss over the FM band and a small size.

The PAFC243B filter is a ceramic filter that operates at 455 kHz. It is composed of three port resonators and lap-driven resonators connected in series. The resonators are arranged in a concentric circle in a radial configuration. The PAFC243B filter combines the use of semiconductor piezoelectric thin-film resonators in one package.

The lap-driven resonators of the PAFC243B filter are designed to operate within the 3dB frequency range of 55.875 kHz to 75.000 kHz. The filter also has an octave bandwidth of 3 dB and an insertion loss of less than 1.5 dB over the entire frequency band. In addition, the filter has a high rejection of unwanted signals outside its frequency range.

The PAFC243B SAW filter has a high Q factor and is calibrated to 455 kHz to provide high signal accuracy and a wide axial frequency range. It also has a low spurious response due to the ceramic technology used in the filter. This allows for good selectivity and high image rejection capability.

The PAFC243B filter is designed to be used in cellular radio systems, FM pagers, and for FM broadcast tuners. Its low insertion loss and small size make it ideal for portable and space-constrained applications. It is especially suitable for applications where low insertion loss and compact design are paramount.

To achieve the high attenuation required by FM receivers, the PAFC243B SAW filter has a three-port tapped-coupler configuration. The central port is the input port and the other two ports are the output ports. The input signal is tapped with a tapped-coupler at the external port. The filtered signal is then fed to the input port via the tapped-coupler. The tap length is adjusted to produce the desired frequency response.

The tap-driven resonators enable the PAFC243B filter to be precisely tuned. The tap length of the resonators is adjusted to achieve the optimum response. This allows the filter to be adjusted to compensate for any manufacturing, environmental, or aging effects that may occur.

The PAFC243B SAW filter is an excellent choice for FM mobile radio applications due to its high Q factor and wide frequency range of operation. It is a compact and reliable filter that performs at a high level and provides superior signal performance. Its adjustable design and low insertion loss make it a great choice for system designers and manufacturers who require a high-quality, low-cost filter solution.

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