RF output power closed-loop detection and adjustment device

Abstract

The invention discloses an RF output power closed-loop detection and adjustment device. The device comprises a power amplifier, a coupler, a detector, a controller and a digital potentiometer. The output end of the power amplifier outputs the power subjected to gain amplification to the coupler. The output end of the coupler directly outputs the output power of the power amplifier, meanwhile couples a part of the RF power to a coupling port, and outputs the power to the detector. The output end of the detector outputs an analog level value to the controller, the output end of the controller outputs a control signal to the digital potentiometer, and the output end of the digital potentiometer is connected to a gain control level input port of the power amplifier. The detector can obtain thereal-time output power of the system, and adjust the voltage divider resistance of the digital potentiometer through the controller to achieve the purpose of adjusting the Vapc. Under the premise that the RF input power is constant, the output power of the power amplifier U1 also changes accordingly to achieve detection and automatic adjustment of the system output power.

Description

technical field [0001] The invention belongs to the technical field of radio frequency and microwave, and in particular relates to a closed-loop detection and adjustment device of radio frequency output power. Background technique [0002] With the wide and in-depth application of radio frequency and wireless technology, radio frequency and microwave technology are widely used, and radio frequency and microwave power amplifiers are ubiquitous, and are used in almost all wireless communication modules, equipment, and terminals. It has a wide range of applications, such as radar, communication base stations, navigation systems, satellite ground stations, and various electronic countermeasure equipment; on the other hand, excessive output power will violate national standards, interfere with other communication equipment, and cause personal injury; Too small output power will cause communication failure. Furthermore, in many real-time communication systems, most of the output ...

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Problems solved by technology

[0003] At present, most of the output power control is realized by sampling feedback and DAC output control level. The main problem is that the ladder and noise of the DAC output signal will have a great impact on the sensitive power amplifier, and even cause the radio frequency signal. Distortion affects the normal communication of the system to a large extent, and even directly causes communication failure

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