GB/T 22318.2-2023 Active

Surface acoustic wave (SAW) resonators are widely used in various fields, including radio frequency (RF) converters for VCRs, local oscillators for cable television (CATV), measurement equipment, remote control, etc. At the same time, SAW resonators are also suitable for narrow-bandwidth filters. This document is limited to the application of SAW resonators in oscillators. The purpose of this document is not to provide a theoretical explanation or attempt to cover all possible problems in practical situations. The focus of this document is on some more fundamental issues, namely, the issues that users should consider before purchasing SAW resonators for a new application to prevent unsatisfactory performance of SAW resonators and protect the interests of users. This document and national standards or detailed specifications issued by manufacturers specify effective combinations of resonance frequency, quality factor, dynamic resistance, and parallel capacitance. The aforementioned specifications include a large number of SAW resonators with standard performance. It should not be overemphasized that users should always refer to these specifications when selecting SAW resonators in any case. If feasible, users can slightly modify their circuits to enable the use of standard resonators, especially in the selection of nominal frequency.