| 摘要 |
A measurement circuit and a corresponding method for a three poles monolithic quartz crystal filter. With the first and the second switch connected respectively to the first and the third pole, any terminal electrode of the filter (the second not included) is not only electrically coupled with the impedance matching circuits, but also electrically coupled with the terminal impeders or the measuring instruments according to the status of the switches. Therefore, by controlling the switches, Fo and BW of the filter could be acquired by the measuring instruments. Moreover, applying the conventional two-pole short-circuits bandwidth theorem, A-sym of the filter could also be acquired by separating the 3-poles filter into two 2-poles filter.
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