Overvoltage protection circuit, device and equipment

Abstract

The invention discloses an overvoltage protection circuit, device and equipment. A radio frequency signal amplification circuit comprises N first transistors; one end of a voltage regulating circuit is connected with a first voltage source, and the other end of the voltage regulating circuit comprises N voltage output ports which are connected with the gates of the N first transistor respectively;the voltage regulating circuit divides the voltage of the first voltage source to obtain N control voltages; the N control voltages control the N transistors to be in different working modes; the N control voltages control the N first transistors to be in an operation mode, and the radio frequency signal amplification circuit amplifies input radio frequency signals and outputs the amplified radiofrequency signals through the radio frequency output end. Thus, the voltage regulating circuit outputs N control voltages to the first voltage source in a voltage division mode according to the working mode of the radio frequency signal amplification circuit, the N control voltages control the corresponding N first transistors to work in the corresponding modes, and the overvoltage situation of the first transistors is avoided by reasonably setting N control voltage values.

Description

technical field [0001] The present application relates to circuit protection technology, in particular to an overvoltage protection circuit. Background technique [0002] The low noise amplifier is generally used as the front end of the radio frequency receiver, and is mainly used to amplify the received radio frequency signal. Low-noise amplifiers usually require low-voltage transistors to achieve low-noise amplification. [0003] In the prior art, in order to ensure that the low withstand voltage transistors are not damaged in any working mode, different voltage sources provide corresponding voltages for the low withstand voltage transistors in different operating modes, thereby avoiding overvoltage of the transistors. Since low noise amplifiers generally include multiple transistors, each transistor needs to correspond to different voltage sources in different operating modes, so that there are multiple voltage sources in the circuit design, which increases the complexit...

AI Technical Summary

Problems solved by technology

Since low noise amplifiers generally include multiple transistors, each transistor needs to correspond to different voltage sources in different operating modes, so that there are multiple voltage sources in the circuit design, which increases the complexity of the circuit design, and also increases the complexity of the circuit design. cost

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