On the Design Requirement Analysis and RF Validation of High-Rejection Passive Block Bandpass Filter for an Advanced STB Up-Converter
نویسندگان
چکیده
This paper proposes the design requirements and target specifications of a high-rejection radio frequency (RF) Surface Acoustic Wave (SAW) filter for an advanced digital set top box (STB) converter. The target application is in the Cable TV (CATV) domain for both retail customers and high-end cable operators. The RF frequency range of the STB is between 50-860MHz for the downstream path and 5-42MHz for the upstream path. The set top box supports both analog and digital video, audio and features. The design analysis and requirements of the SAW type passive bandpass filter has been explained with system level simulations. Simulations have also been carried out for multiple filter combinations to see the overall effect in the block up-converter RF performance. Actual performance validation for been carried out for the RF parameters to support the design analysis. An out of band rejection better than 35dB has been obtained.
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