Power control circuit and power control method of solid-state power amplifier

Abstract

The invention relates to a power control circuit, especially to a power control circuit and a power control method of a solid-state power amplifier. The invention provides the power control circuit and the power control method of a solid-state power amplifier to solve the problems in the prior art. An automatic level control loop and an amplitude limiter are adopted to realize the circuit. The circuit ensures that the output power is constant without changing while the input power and the temperature of a solid-state power amplifier change, and has an input over-excitation protection function for a radio frequency amplification link during locking of the automatic level control loop. The automatic level control loop is used for stabilizing an output power value P2 of the automatic level control loop as an output power set value P2-bar if the amplitude of an input signal power value Pin changes, and when the output power value P2 of the automatic level control loop passes by the amplitude limiter and the radio frequency link, formed output power Pout is stabilized as an output power set value Pout-bar.

Description

technical field [0001] The invention relates to the field of power control circuits, in particular to a power control circuit and method of a solid-state power amplifier. Background technique [0002] In transmission systems such as communication and navigation, solid-state power amplifiers are required to ensure that the output power remains constant under the conditions of temperature changes and input power changes. The output power and overdrive of a solid-state power amplifier are directly determined by the input power, so it is necessary to control the input power. [0003] During the use of solid-state power amplifiers, the factors that cause input power changes mainly come from three aspects. One is the change of the output power of the pre-stage module of the solid-state power amplifier with temperature or time; the other is the overshoot before the loop is stable when the front-end module of the power amplifier has an ALC circuit; the third is the temperature char...

AI Technical Summary

Problems solved by technology

The traditional automatic level control loop performs power sampling at the back end of the RF amplification link. Although this structure can compensate the temperature characteristics of the RF amplifier, the detection voltage is easily disturbed and the electromagnetic compatibility performance is poor; the traditional automatic level control The control voltage of the electronically adjustable attenuator in the loop is generated by the differential amplifier circuit. Due to the limited amplification factor, the threshold value is not sensitive and debugging is difficult. At the same time, the ALC circuit will output a short-term overshoot signal during the locking process. And enter the input end of the RF amplification link, it is easy to cause the power amplifier in the RF amplification link to be over-excited and burned

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