FBAR filter circuit structure

The invention discloses an FBAR filter circuit structure which is characterized in that the FBAR filter circuit structure comprises a filtering module and a notch module, and the notch module is connected with the input end or the output end of the filtering module and used for forming a transmission zero point in a stop band of an FBAR filter circuit. According to the FBAR filter circuit, the notch module and the filtering module which are connected in series are adopted, the notch module can form a transmission zero point in the stop band of the FBAR filter circuit, so that out-of-band rejection can be improved, and the position of the transmission zero point of the FBAR filter circuit can be accurately controlled by adjusting the resonant frequency of the first resonator in the notch module. 本发明公开了一种FBAR滤波器电路结构，一种FBAR滤波器电路结构，其特征在于：包括滤波模块和陷波模块，所述陷波模块与滤波模块的输入端或输出端相连，用于在FBAR滤波器电路的阻带形成一个传输零点。本发明通过采用串联的陷波模块和滤波模块，其中的陷波模块可以在FBAR滤波器电路的阻带形成一个传输零点，从而可以提高带外抑制，通过调整陷波模块中第一谐振器的谐振频率，能够准确控制FBAR滤波器电路传输零点的位置。