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Control system capable of quickly responding to automatic level control loop

A technology of automatic level and control loop, applied in the direction of transmission system, electrical components, etc., can solve problems such as poor stability and slow response speed

Active Publication Date: 2020-05-19
BEIJING MAXWELL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For this reason, the embodiment of the present invention provides a control system that responds quickly to the automatic level control loop to solve the problems of slow response speed and poor stability of the existing automatic level control loop

Method used

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  • Control system capable of quickly responding to automatic level control loop
  • Control system capable of quickly responding to automatic level control loop
  • Control system capable of quickly responding to automatic level control loop

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Embodiment 1

[0024] This embodiment discloses a control system that quickly responds to an automatic level control loop, including: a preset voltage module 1 and an automatic level control ALC loop module 2. The ALC loop module 2 changes when the input signal changes. , The front-end analog attenuator 3 works in the previous control voltage state, the output of the front-end analog attenuator 3 is sampled by the directional coupler 4, after sampling, it is converted into a real-time dynamic voltage by the loop detector 5, and the real-time dynamic voltage is transmitted to the loop Op amp, the loop op amp adjusts its output voltage through proportional calculation or integration, and then provides it to the front-end analog attenuator 3 to form a closed loop. The front-end analog attenuator 3 adjusts its own gain value according to the latest real-time control voltage, and the ALC loop forms The dynamic loop, until the voltage value corresponding to the required output power set at the loop ...

Embodiment 2

[0052] When the dynamic range of the input signal is not large, and the average detection independent of the modulation signal is required, and the peak average of the signal is relatively large, the detector in the ALC loop needs to use an average detector and cooperate with an external capacitor. The averaging detector itself has a slower time response because it contains an averaging part, and the time response time is slower when an external capacitor performs low video filtering on a signal with a high peak-to-average ratio. In order to meet the requirements of fast real-time signal power control, it is necessary to introduce the above-mentioned new preset voltage module 1 to the ALC loop to ensure that the initial attenuation state and final value of the front-end analog attenuator 3 are relatively different before the ALC loop works. small. The preset voltage value needs to be set by the voltage corresponding to the input signal, and the ALC loop completes the ALC closed...

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Abstract

The embodiment of the invention discloses a control system capable of quickly responding to an automatic level control loop. The control system comprises a preset voltage module and an automatic levelcontrol ALC loop module. When an input signal is changed, the ALC loop module is switched on; the output of a front-end analog attenuator is sampled by a directional coupler; converting into real-time dynamic voltage is carried out through a loop detector after sampling; the real-time dynamic voltage is transmitted to a loop operational amplifier; the output voltage of the loop operational amplifier is adjusted in a proportional calculation or integral form; then the signals are provided for the front-end analog attenuator to form a closed loop; the front-end analog attenuator adjusts the gain value of the front-end analog attenuator according to the latest real-time control voltage; the ALC loop forms a dynamic loop until the voltage value corresponding to the required output power set at the loop operational amplifier is adjusted; and the preset voltage module loads the preset voltage to the ALC loop, so that the ALC loop quickly works near the attenuation value and quickly enters astable state. The problems that an existing automatic level control loop is low in response speed and poor in stability are solved.

Description

Technical field [0001] The embodiment of the present invention relates to the technical field of automatic control, in particular to a control system that quickly responds to an automatic level control loop. Background technique [0002] When the radio frequency link channel receives or transmits signals, it will encounter the situation that the dynamic range of the input signal changes rapidly, and the response to the hardware link will make the output signal also have a larger dynamic range. In some applications, the output power needs to be able to keep the output stable at a certain fixed value when the input signal changes in a large dynamic range, and it is necessary to introduce the automatic loop gain control circuit ALC circuit part of the link. It can ensure that the output signal power is stable at a fixed value within a certain range during normal operation. [0003] In some networking applications, the system has multiple communication nodes, and each node needs to co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7085
CPCH04B1/7085
Inventor 李梁张江林
Owner BEIJING MAXWELL TECH
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