Method for restraining cavity effect of low-noise amplifier circuit

Abstract

The invention belongs to the radio frequency technical field of satellite receivers, and particularly relates to a method for restraining the cavity effect of a low-noise amplifier circuit. Accordingto the FSS electromagnetic simulation software, the resonant frequency points of the inherent form of a metal cavity are simulated and analyzed. Therefore, the cavity effect possibly existing in thedesign of the low-noise amplifier circuit is inhibited. Based on the method for restraining the cavity effect of the low-noise amplifier circuit, the hidden danger that the cavity effect can exist canbe distinguished at the initial stage of design, so that the influence of the prolonged development cycle caused by the engineering verification means is reduced.

Description

technical field [0001] The invention belongs to the radio frequency technical field of satellite receivers, and in particular relates to a method for suppressing the cavity effect of a low-noise amplifier circuit. Background technique [0002] The low noise amplifier circuit is an important part of the satellite receiving antenna. Its main function is to filter and amplify the noise signal received by the antenna, and the noise introduced should be as small as possible. Through the analysis of the RF link, it can be known that the noise figure of the system mainly depends on the LNA circuit, so the LNA circuit should be well shielded by the cavity, and at the same time, because the cavity has a self-resonant frequency, it cannot resonate with the LNA. Excited. In engineering, it is often necessary to verify whether the LNA circuit and the cavity will have self-excitation through a large number of samples. The ideal solution is to change the shape of the cavity inside and th...

AI Technical Summary

Problems solved by technology

In engineering, it is often necessary to verify whether the LNA circuit and the cavity will have self-excitation through a large number of samples. The ideal solution is to change the shape of the cavity inside and then change the self-resonant frequency of the cavity, or only need to change the structure If it is heavy, the printed board needs to be changed, but it also needs to be verified under various environmental conditions through a large number of samples

Therefore, if there is no effective method to predict and guide the design, once the self-excitation phenomenon occurs in the product development process, it will have a serious impact on the development cycle