Automatic gain correction circuit with variable setpoint

摘要

An automatic gain correction circuit for radiofrequency signals applies notably to the regulation of the amplification of signals for satellite radionavigation. The automatic gain correction circuit is able to receive an input radiofrequency signal and to deliver an output radiofrequency signal of which a mean amplitude is slaved to a setpoint. It comprises means for modifying the setpoint as a function of the mean amplitude of the input signal between a minimum setpoint value and a maximum setpoint value, the minimum setpoint value corresponding to a first mean amplitude of the input signal and the maximum setpoint value corresponding to a second mean amplitude of the input signal, the first mean amplitude being lower than the second mean amplitude.

主权项

1. An automatic gain correction circuit configured to receive an input radiofrequency signal and to deliver an output radiofrequency signal of which a mean amplitude is slaved to a setpoint, comprising:
means for generating the setpoint as a function of the mean amplitude of the input signal, said setpoint configured to evolve between a minimum setpoint value and a maximum setpoint value, the minimum setpoint value corresponding to a first mean amplitude of the input signal and the maximum setpoint value corresponding to a second mean amplitude of the input signal, the first mean amplitude being lower than the second mean amplitude; an open loop; an adder receiving on a first input the input signal and on a second input a signal as output from the open loop, the adder delivering on an output the output signal; a return loop receiving said output signal; a subtractor receiving on a first input a signal as output from the return loop and on a second input the setpoint, the subtractor having an output delivering a signal equal to the difference between the two signals received as input, said signal being injected on an input of the open loop; and a regulating loop receiving a signal from the open loop and delivering the setpoint.