LST-9.0MHz晶体滤波器的研制

The Design and manufacture of LST-9.0MHz Crystal Filter

设计制作了一种以AT切基频压电石英晶体振子为滤波元件的LST - 9.0MHz型分立式带通晶体滤波器。滤波电路采用两节差接桥型电路即格型网络 ,输入信号在输入端为双路平衡输入 ,网络输入 /输出端阻抗不对称 ,直流不共地 ,具有在 - 5 5～ +85℃工作环境温度范围内、工作频率 9.0MHz时 ,中心频率偏差≤ 2 0 0Hz、矩形系数≤ 2 .

Using AT cut thickness oscillate mode piezoelectricity quartz resonator and the normal crossed network at the crystal filter design, It was designed LST-9.0MHz two channel message balance input, input/output resistance dissymmetry, two stage bridge circuit segregative net of band pass. when the operation temperature is at the range from -55 to +85℃, the operation frequency is 9.0 MHz, the center frequency deviation will less than 200 Hz, the rectangle coefficient will less than 2.5.