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Automatic range switching system for external modulation

A technology of automatic switching and external modulation, applied in the direction of amplitude modulation components, etc., can solve the problems of amplitude sampling distortion of external modulation source and reduce the signal-to-noise ratio of modulated signal, so as to avoid sampling distortion, improve signal-to-noise ratio, and increase sampling Amplitude effect

Active Publication Date: 2016-11-30
NANJING GUORUI ANTAIXIN TECH
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  • Application Information

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Problems solved by technology

[0003] If the amplitude of the external modulation source is too high, it will easily lead to sampling distortion. If the amplitude is too low, the signal-to-noise ratio of the modulation signal will be reduced. Therefore, the internal characteristics of the modulation system limit the amplitude of the external modulation source to a very narrow range.

Method used

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  • Automatic range switching system for external modulation
  • Automatic range switching system for external modulation
  • Automatic range switching system for external modulation

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Embodiment 1

[0020] Such as Figures 1 to 3 As shown, the range automatic switching system for external modulation includes a sampling control module, a data acquisition module, a data transmission module, a range control module, a data analysis and calculation module, and the data analysis and calculation module sets the range control code as an initial value , start the sampling control module, enable the data acquisition module, and collect the data of the external modulation source; the data analysis and calculation module calculates the extreme value and range control code of the data collected by the data acquisition module; when the extreme value of the collected data is greater than or equal to the sampling When the AD range is 1 / 2, the data collected by the data acquisition module is sent directly through the data sending module; when the extreme value of the collected data is less than 1 / 2 of the sampling AD range, the data analysis and calculation module expands the range control...

Embodiment 2

[0025] Applying the invention to a certain signal generator

[0026] 1. Refer to the principle of the range control module to design the matching resistors of the external modulation operational amplifier circuit of the digital board to form the amplification factors of ×1, ×2, ×4 and ×8, the sampling AD is 12 bits, and the reference voltage is 3.3V;

[0027] 2. Connect the external modulation source to the external modulation port of the signal generator, and output a 1KHz sinusoidal signal;

[0028] 3. Connect the receiver to the RF output of the signal generator;

[0029] 4. Set the RF frequency of the signal generator to 1GHz, set the AM external modulation, and set the modulation depth to 0~100%, with a step of 10%, to test the modulation depth and distortion of the signal generator respectively;

[0030] 5. Change the amplitude of the external modulation source, keep the frequency constant, and then set the modulation depth to 0~100%, with a step of 10%, to test the mod...

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Abstract

Automatic range switching system for external modulation, including sampling control module, data acquisition module, data transmission module, range control module, data analysis and calculation module, data analysis and calculation module sets the range control code as the initial value, and starts the sampling control module , enable the data acquisition module to collect the data of the external modulation source; the data analysis and calculation module calculates the extreme value of the data and the range control code; when the extreme value of the collected data is ≥ 1 / 2 of the sampling AD range, the data is sent directly ; When the extreme value of the collected data is less than 1 / 2 of the sampling AD range, the range control code is expanded, and the range control code is sent to the range control module to realize range switching. After switching, re-collect the data of the external modulation source and calculate the data again Extreme value and range control code, until the extreme value of the data ≥ 1 / 2 of the sampling AD range, the data is sent directly; the data of the external modulation source is continuously collected, processed and sent to the modulation circuit to generate a modulation signal.

Description

technical field [0001] The invention relates to an automatic range switching system, in particular to an automatic range switching system for external modulation, relates to the field of signal generation, and belongs to a signal processing method. Background technique [0002] When an external signal is used as the modulation source, the amplitude of the external signal is limited by the range and signal integrity of the internal sampling circuit of the modulation system. [0003] If the amplitude of the external modulation source is too high, it will easily lead to sampling distortion, and if the amplitude is too low, the signal-to-noise ratio of the modulation signal will be reduced. Therefore, the internal characteristics of the modulation system limit the amplitude of the external modulation source to a very narrow range. Contents of the invention [0004] Technical problem to be solved: In view of the above problems, the present invention provides a method that can c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03C1/02
Inventor 钟景华张玉凤
Owner NANJING GUORUI ANTAIXIN TECH
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