Reconfigurable band-pass filter and manufacturing method thereof

Abstract

The present invention discloses a reconfigurable band-pass filter and a manufacturing method thereof. The reconfigurable band-pass filter includes two or more filter units connected in cascade with amplifier unit(s) connected between two adjacent filter units; the filter units are frequency-reconfigurable filter units, and the amplifier unit(s) is / are gain-reconfigurable amplifier unit(s). Through the arrangement of two or more filter units connected in cascade and the amplifier unit(s) connected between two adjacent filter units, the problem of inter-stage matching among the multi-stage filter units is solved and a reconfigurable band-pass filter featuring the reconfigurable frequency, bandwidth and gain can be reconstructed. The control is simple and convenient and is conducive to the integration, modularization and miniaturization of an RF front-end, helping to further control the cost and the convenience of mass production.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a reconfigurable bandpass filter and a manufacturing method thereof. Background technique [0002] In the frequency band below 6GHz, wireless communication systems of various standards (such as GSM, GPS, WCDMA, TD-SCDMA, LTE) and wireless local area network (WLAN) are crowded, so it supports multi-frequency multi-mode radio frequency for wireless communication of various standards Technology has become a research and application hotspot. As a key component of the RF transceiver, the filter plays the role of frequency selection or frequency suppression. If multiple groups of filters are used in a multi-frequency multi-mode radio frequency transceiver, not only the cost is high but also it is not conducive to miniaturization. Therefore, frequency and bandwidth reconfigurable bandpass filter becomes an effective means to solve the above problems. [0003] Therefore, w...

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Problems solved by technology

However, the above control strategies are complex, the passband insertion loss is large, and cannot meet the requirements of narrowband applications.

In addition, the Chinese patent "Variable Bandwidth RF Filter" (authorized announcement number CN104205481B) adopts two reconfigurable filters to realize the strategy of reconfigurable bandwidth, but there is an inter-stage resonance problem in this structure, which requires an additional band The notch adjustable filter is used for suppression, which increases the design workload and control complexity, especially in the case of narrow band, the interstage resonance is difficult to eliminate, and even destroys the performance of the pass band

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