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本文叙述了单谐振体差接桥型晶体滤波器的设计过程,推导出了实用的设计计算公式。探讨了利用通用晶体设计出满足一定指标要求的窄带晶体滤波器的方法。无需滤波晶体,而用普通的振荡晶体研制出了符合工程要求的相位跟随反馈(PFFB)环内的窄带晶体滤波器。灾践证明,所采用的设计理论是正确的。
This paper describes the design process of a single resonator differential bridge crystal filter and deduces a practical design and calculation formula. The method of designing a narrowband crystal filter which meets certain requirements by using general-purpose crystal is discussed. Without filtering the crystal, a narrow band crystal filter in the phase following feedback (PFFB) loop that meets the engineering requirements has been developed using ordinary oscillating crystals. Disaster proved that the design theory used is correct.