FBAR filter

• Main Authors: ZHANG SHIQIANG, WANG LEI, WANG SHENGFU, LI YONGCHENG, QIAN LIXUN, GUO SONGLIN, LI LI, LI JIANGUO, MA WENTAO, LI HONGJUN, SUN CONGKE, WANG XIAOWEI, YANG LIANG, SONG BINGBING, WANG XIAOLONG, ZHANG SHAOHUA, XU JIA, WANG QIANLONG, SHI JUAN, FENG LIYAN, LI LIANG
• Format: Patent
• Language: Chinese; English
• Published: 16.04.2021
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

The invention is suitable for the technical field of filters, and provides an FBAR filter, which is characterized in that the input end of a cancellation circuit is connected with the input end of an FBAR filter circuit, the output end of the cancellation circuit is connected with the output end of the FBAR filter circuit, the cancellation circuit is used for forming a second path, and when the working frequency is in the stop band of the FBAR filter, When the working frequency is in the passband of the FBAR filter, the signal passes through the cancellation circuit, and when the working frequency is in the passband of the FBAR filter, the signal passes through the FBAR filter circuit. High suppression can be realized at the low-frequency end of the stop band by adding the offset circuit, and components in the offset circuit do not cause great increase of the chip size of the FBAR filter, and do not introduce more loss and deteriorate in-band insertion loss. 本发明适用于滤波器技术领域，提供了一种FBAR滤波器，该FBAR滤波器包括：将抵消电路的输入端连接FB