Radio frequency port electrostatic protection circuit and method

Abstract

The invention discloses a radio frequency electrostatic protection circuit and method. The radio frequency electrostatic protection circuit comprises a radio frequency port, an electrostatic protection circuit and a radio frequency circuit module; the electrostatic protection circuit comprises a low-frequency leading-out circuit and a low-frequency filtering component; the low-frequency filteringcomponent is connected between the radio frequency port and the radio frequency circuit module; the low-frequency filtering component is used for performing low-frequency filtering on signals transmitted to the radio frequency circuit module; one end of the low-frequency leading-out circuit is connected between the radio frequency port and the low-frequency filtering component, and the other end of the low-frequency leading-out circuit is grounded; the low-frequency leading-out circuit is equivalent to an open circuit for a high-frequency signal and equivalent to a short circuit for a low-frequency signal, and therefore, when static electricity comes, the low-frequency leading-out circuit forms a low-pass loop to play a role in protecting a port device; radio frequency signals are relatively high and are generally greater than 450M, so that signals transmitted to the radio frequency circuit module are the low frequency-filtered radio frequency signals, and therefore, the influence of the static electricity on the radio frequency port is effectively avoided, and the influence of parasitic parameters of a TVS tube on the radio frequency performance of the port is reduced to the maximum extent.

Description

technical field [0001] The invention relates to the field of radio frequency design, in particular to a radio frequency port electrostatic protection circuit and method. Background technique [0002] In the radio frequency system, the back-end circuit of the radio frequency port generally includes a variety of components, some of which have relatively low ESD (Electro-Static discharge, electrostatic discharge) level, such as small signal amplifiers, radio frequency switches and variable attenuation Devices such as devices, static electricity will cause certain adverse effects on these devices with low ESD levels, and even cause the devices to fail to work normally. Therefore, it is necessary to add additional ESD protection measures to the ports to protect these components. [0003] The traditional method uses a TVS tube (Transient Voltage Suppressor, transient voltage suppressor diode), but this type of TVS tube has parasitic parameters at high frequencies, and this parasi...

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Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to provide a radio frequency port electrostatic protection circuit and method to solve the problem in the prior art that the radio frequency port uses TVS tube anti-static to introduce parasitic parameters and affect the radio frequency performance of the port

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