Large dynamic power control unit of airborne broadband linear power amplifier

Abstract

The invention provides a large dynamic power control unit of an airborne broadband linear power amplifier, which comprises a preceding-stage driving and releasing link, a numerical control correction module, a temperature sensor and a final-stage power amplifier link, and is characterized in that the output end of the preceding-stage driving and releasing link is connected with the final-stage power amplifier link, the input end of the preceding-stage driving and releasing link receives an excitation signal and outputs a driving signal end to the final-stage power amplifier link; the numerical control correction module is connected with the preceding-stage driving and releasing link, and the final-stage power amplifier link outputs a set power value by controlling the preceding-stage driving and releasing link; and the temperature sensor is arranged on the shell of the final-stage power amplifier module, is connected with the numerical control correction module, and is used for monitoring the temperature of a final-stage power amplifier link in real time and outputting a preceding-stage driving link control signal. The method has the characteristics of large power control dynamic range, easy engineering implementation, high power control precision, stable power at high and low temperatures, excellent broadband power flatness and the like.

Description

technical field [0001] The invention relates to power amplifier control technology, in particular to a large dynamic power control unit of an airborne broadband linear power amplifier. Background technique [0002] As airborne electronic countermeasure equipment has higher and higher requirements for reliability and miniaturization, solid-state power amplifiers have gradually replaced traveling wave tube amplifiers and become the first choice for electronic countermeasure transmitters. In order to form a variety of radar patterns to form deception, electronic countermeasure equipment needs to linearly adjust the transmission power within a large dynamic range. At the same time, because the working environment of the airborne equipment is prone to change, the output power of the power amplifier needs to be stable at different temperatures. At present, the power control circuit for airborne linear power amplifiers mainly has the following characteristics: 1. Multiple digitall...

AI Technical Summary

Problems solved by technology

[0003] For feature 1, ideally, when the power of the power amplifier needs to be attenuated in a wide range, the signal power at the output end of the digital control attenuator is extremely small, but in the electromagnetic environment of the power amplifier, the signal power in the back-end amplification link is generally large, which is easy Signal coupling, leakage, etc. will cause the signal power at the output end of the digital control attenuator to be too large, which cannot achieve the ideal situation. Therefore, the circuit has disadvantages such as difficulty in debugging and difficulty in improving the dynamic range of power control in engineering.

For feature 2, due to the characteristics of the power amplifier core, the output power of different frequencies varies with the change of the ambient temperature, so the temperature compensation attenuator cannot accurately compensate the power attenuation for each frequency point, which affects the transmission of the power amplifier. Power Control Accuracy

For feature 3, the two-dimensional attenuation correction table cannot accurately correct the transmit power of the power amplifier according to temperature and frequency changes, which affects the frequency flatness of the power amplifier

Images