Protective circuit of power amplifier tube, method of power amplifier tube and power amplifier tube

Abstract

The invention provides a protective circuit of a power amplifier tube, a method of the power amplifier tube and the power amplifier tube. The protective circuit of the power amplifier tube comprises the power amplifier tube, an input end of the power amplifier tube is connected with an input end of a radio-frequency signal, a drain electrode or a collector of the power amplifier tube is connected with a first power supply (VDD) end, and an grid electrode or a base of the power amplifier tube is connected with a second power supply (VGC) end. The protective circuit of the power amplifier tube further comprises a transient current detector and a controller, wherein the transient current detector is located between the drain electrode or the collector of the power amplifier tube and a direct current power supply end and is used for detecting in real-time the current when the power amplifier tube works, and the controller is connected with the transient current detector and is used for cutting off the radio-frequency signal which is input into the power amplifier tube or controlling the cutting-off of the power amplifier tube when the current detected by the transient current detector is larger than a preset limit value. The protective circuit of the power amplifier tube, the method of the power amplifier tube and the power amplifier tube can avoid injury caused by overload of the power amplifier tube.

Description

technical field [0001] The invention relates to the communication field, in particular to a protection circuit and method for a power amplifier tube and a power amplifier tube. Background technique [0002] In today's increasingly fierce competition for base station products, the power amplifier module is a key module of base station products, and its competition is more intense. In addition to efficiency and single board cost, it is also reflected in maintenance costs. The related research and development technology and production applications will surely become The focus of attention of enterprises in the industry. [0003] The schematic diagram of the traditional power amplifier tube circuit in the industry is as follows: figure 1 As shown, that is, the circuit includes a power amplifier tube, the input terminal of the power amplifier tube is connected to the input terminal (RFin) of the radio frequency signal, the drain or collector of the power amplifier tube is connec...

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Problems solved by technology

[0005] The embodiment of the present invention provides a protection circuit, method and power amplifier tube for a power amplifier tube to solve the problem of damage to the power amplifier tube caused by the overload of the power amplifier tube due to load mismatch, voltage instability, etc.

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