Automatic gain control device of superheterodyne receiving circuit and superheterodyne receiving circuit
An automatic gain control and receiving circuit technology, applied in the field of circuits, can solve problems such as burning hardware and algorithm non-convergence, and achieve the effect of reducing risks and improving stability and security.
Inactive Publication Date: 2015-05-20
BEIJING NORTHEN FIBERHOME TECH CO LTD
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[0005] However, the existing automatic gain control method is realized through the execution of corresponding algorithms by the processor, which has the risk of positive feedback due to non-convergence of the algorithm, and even burns the hardware in severe cases.
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[0048] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0049] The present application embodies an automatic gain control device for a superheterodyne receiving circuit. The automatic gain control device is composed of a detector and a voltage comparison module, and the output of the variable gain amplifier in the superheterodyne receiving circuit The voltage is detected to obtain the detection voltage. The voltage comparison module compares the detection voltage with the reference voltage to obtain a difference voltage, which is then out...
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The embodiment of the invention provides an automatic gain control device of a superheterodyne receiving circuit and the superheterodyne receiving circuit. The automatic gain control device comprises a radiodetector and a voltage comparison module connected with the radiodetector, wherein the radiodetector is connected with the output end of a variable gain amplifier of the superheterodyne receiving circuit, detects the intensity of output signals of the variable gain amplifier and obtains detection voltage; the voltage comparison module is connected with the input end of the variable gain amplifier of the superheterodyne receiving circuit, comprises the detection voltage with the reference voltage, obtains difference voltage and outputs the difference voltage to the variable gain amplifier, so that the variable gain amplifier is subjected to gain regulation according to the difference voltage. The automatic gain control is realized in a hardware mode, and compared with the prior art of executing the corresponding algorithm through a processor, the automatic gain control device and the superheterodyne receiving circuit have the advantages that the automatic gain control mode is realized, and the stability and the security of a circuit are improved.
Description
technical field [0001] The present application relates to the field of circuit technology, and more specifically relates to an automatic gain control device for a superheterodyne receiving circuit and a superheterodyne receiving circuit. Background technique [0002] The superheterodyne receiving circuit adopts the superheterodyne method. After the signal received by the antenna is amplified and frequency-converted, the frequency-converted signal is obtained, and then the digital signal is obtained through analog / digital conversion, and the signal is processed by the processor. The superheterodyne receiving circuit can be widely used in various applications, such as in frequency scanners, for acquiring radio frequency signals, etc. [0003] In the superheterodyne receiving circuit, due to the different sizes of the received signals, in order to achieve a larger receiving dynamic range, it is usually necessary to design an automatic gain control (AGC, automatic gain control) ...
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IPC IPC(8): H03G3/30H04B1/26
Inventor 刘俊
Owner BEIJING NORTHEN FIBERHOME TECH CO LTD