High-performance LC duplexer circuit

Abstract

The invention discloses a high-performance LC duplexer circuit. The high-performance LC duplexer circuit comprises a symmetric topology circuit structure which is an elliptic function response, wherein a Port-Com port is a common port connected to a CATV, a Port-TV port is a television signal output port, and a Port-Dat port is a broadband data access port. A capacitor C01, a capacitor C02, a capacitor C03, a capacitor C02 and a capacitor C01 are connected between the Port-Com port and the Port-TV port in series. A filter L11, a filter L12, a filter L13, a filter L12 and a filter L11 are connected between the Port-Com port and the Port-Dat port in series. According to the high-performance LC duplexer circuit, element specification values of a traditional filter prototype circuit are symmetrically arranged, technical measures such as the number of adjustable parameters of a high-order filter are further reduced, the debuggability of the filter performance in practical engineering application is enhanced, and the production efficiency and the product performance are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of radio frequency circuit design, in particular to a high-performance LC duplexer circuit. Background technique [0002] In many LC duplexer circuit applications, it is necessary to adopt a higher-order filter comprehensive design to meet the design requirements. As the design order of the filter becomes higher and higher, the specifications of the inductors, capacitors and other components The accuracy requirements have also increased, so that it is difficult to meet the requirements of SMD components with existing specifications. The relevant technical difficulties and improvement factors can be summarized as follows: [0003] The value of LC components deviates from the standard SMD component specifications; due to the increasing perfection and maturity of the comprehensive design technology of filters, conventional and well-known design methods can be used to quickly and conveniently obtain LC filter co...

AI Technical Summary

Problems solved by technology

[0004] The influence of distributed response in PCB circuit topology design (Layout); to achieve higher stop-band suppression performance, the filter design with elliptic function response is usually used. For LC filters, the topology is mainly carried out on the PCB board through lumped components. The wiring is connected to each other. The number of components that need to be connected to the same connection node in the circuit is up to 5. Conventional PCB design can easily imply too many distribution parameters in the wiring connecting 5 components, resulting in deterioration of the filter response. The response of the filter is quite different from that of the synthesized design

[0005] There are too many variable parameters of LC filters, resulting in poor performance consistency; for high-order LC filters, conventional design synthesis usually gets more design variables, especially for high-order filters, too many design variables will seriously affect It is difficult to debug the filter, especially in the design improvement that needs to minimize the accuracy requirements of the components, reducing the filter design variables is an important and effective means

[0006] The manual intervention and debugging of the LC filter reduces production efficiency; in the actual application requirements of the C filter or duplexer, especially the high-order filter, due to the actual situation that the accuracy of the components is too high, usually the real object of the air-core coil The form replaces the inductance element in it, and manual intervention is performed in the form of manual adjustment of the air-core coil, so as to realize the small correction of the component parameters, which seriously affects the production efficiency

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