A kind of feed-forward agc device
A feedforward and gain control technology, which is applied in the electronic field, can solve the problems of long building time of the AGC circuit loop and beard structure, etc., and achieve the effect of shortening the gain setting time and simple structure
Active Publication Date: 2015-11-18
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology
[0004] For the purpose of the present invention is to provide a kind of feedforward type AGC device, to solve the traditional AGC circuit loop set-up time is long, must construct the problems such as exponential VGA, can build up gain quickly
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[0018] A kind of feed-forward AGC device of the present invention comprises VGA, signal detection module and gain control module, and VGA is connected with signal detection module, gain control module, is used for receiving external input signal, and determines the VGA according to the size of gain control signal Gain, so as to amplify the input signal accordingly;
[0019] The signal detection module is connected with the VGA and the gain control module, and is used to detect the amplitude of the external input signal, and sends the detected amplitude information to the gain control module;
[0020] The gain control module is connected with the VGA and the signal detection module, and is used for converting the current signal containing the amplitude information of the input signal into a voltage signal, and serving as a gain control signal of the VGA.
[0021] The device of the present invention will be described in detail below through embodiments and in conjunction with th...
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The invention discloses a feedforward-type automatic gain control (AGG) device and relates to an electronic technology. The feedforward-type AGG device comprises a variable gain amplifier (VGA), a signal detecting module and a gain control module, wherein the input of the VGA is connected with the input of the signal detecting module, the output of the signal detecting module is connected with the input of the gain control module, the output end of the gain control module is connected with a control end of the VGA, the output of the gain control module serves as gain control signals of the VGA to control gain changes of the VGA, the output of the VGA is the output of the AGC circuit. Gain of the VGA is inversely proportional to the gain control signals, and the gain control signals are inversely proportional to ranges of input signals. Thus, the output of the AGC circuit is one fixed value to input signals of random ranges in the input range, and output signals are not changed along with changes of the input signals. According to the feedforward-type AGG device, the gain of the VGA is inversely proportional to the gain control signals, fixed output signals can be obtained quickly and accurately by a feedforward AGC system to the random input signals in the input range, and a circuit is simple in structure.
Description
technical field [0001] The invention relates to the field of electronic technology, and is a feed-forward AGC device. Background technique [0002] The automatic gain control circuit (AGC) is a circuit that keeps the swing of the output signal independent of the input signal and constant by changing the gain. It is widely used in various electronic systems to increase the dynamic range. The traditional AGC circuit structure such as figure 1 As shown, it consists of a variable gain amplifier (VGA), an amplitude detector, and a loop filter. The detector is used to detect the magnitude of the output signal, and the output of the detector is compared with the reference level to generate a control voltage through the loop filter to control the gain of the VGA. When the amplitude of the output signal increases, the output level of the detector also increases, and the control voltage decreases by comparing with the reference level, and the gain of the VGA and the output signal a...
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IPC IPC(8): H03G3/30
Inventor 杨海钢程心高同强尹韬
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI