GB/T 27700.2-2011 in English

《GB/T 27700.2-2011有质量评定的声表面波（SAW）滤波器 第2部分：使用指南》由TC182（全国频率控制和选择用压电器件标准化技术委员会）归口，主管部门为工业和信息化部（电子）。

Scope

The surface acoustic wave filter specified in this part is widely used in the fields of television, satellite communication, optical fiber communication and mobile communication. Because these surface acoustic wave filters have different performance indicators. So it can be divided into some basic categories. This part includes various surface acoustic wave filter structures. The operating frequency range of these surface acoustic wave filter structures is about 10 MHz to 3 GHz, and the relative bandwidth is 0.02% to 100% of the center frequency. The purpose of formulating this section is not to provide theoretical explanations. At the same time, this section cannot solve problems that may occur in practice. This part aims to explain some basic issues that users should consider before ordering a new-purpose surface acoustic wave filter, so that users can obtain products that meet the performance requirements. The standards given in this part and the detailed specifications issued by the manufacturers define the nominal frequency, passband bandwidth, passband fluctuation, squareness coefficient and terminal impedance. This section lists a large number of various SAW filters with typical performance. But it should not be overemphasized that the user should choose the standard SAW filter in any case, and he may only cause minor changes in the circuit in order to use the standard SAW filter. This is especially for the selection of the nominal frequency of the surface acoustic wave filter.