Microvolt alternating-current signal generating device
An AC signal and generating device technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of insufficient frequency band, large signal noise, and low amplitude accuracy, and achieve low distortion and accurate microvolt signals , The effect of flat amplitude-frequency curve
Inactive Publication Date: 2013-11-20
CHANGSHA MINYUAN ELECTRONICS
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Problems solved by technology
Traditional signal sources generally use DDS to generate frequency-adjustable signals, and use analog potentiometers or digital potentiometers to adjust the output voltage. Although the application of these technologies can make signal sources better meet the above requirements, the common problem is that the frequency band is not wide enough. , low amplitude accuracy, large signal noise and other defects
For more stringent requirements such as outputting high-precision, low-amplitude, modulable, low-noise, and low-distortion signals, traditional signal sources are even more powerless.
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[0015] figure 1 It is a structural diagram of a microvolt-level AC signal generating device. Man-machine interface 101 , processor 102 , DDS circuit 103 , digital control attenuation 104 , filter circuit 105 , signal feedback circuit 106 , analog attenuation network 107 and output interface 108 . The man-machine interface 101 is a touch screen, through which the parameters of the output waveform can be set and processed by the processor. The processor 102 collects peripheral circuit feedback signals and analyzes and processes them. The DDS circuit 103 outputs an AC signal with adjustable frequency according to the control value given by the processor. The numerically controlled attenuation circuit 104 uses the output signal of the DDS circuit 103 as a signal source and performs amplitude modulation and attenuation on the signal of the signal source according to the control value given by the processor 102, and the filter circuit 105 receives the output signal of the numerica...
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The invention discloses a microvolt alternating-current signal generating device. The microvolt alternating-current signal generating device consists of a human-machine interface, a processor, a DDS (direct digital synthesis) circuit, a numerical-control attenuation circuit, a filter circuit, a signal feedback circuit, a simulation attenuation circuit and an output interface. In the device, the processor controls a backward-stage circuit to generate an alternating-current signal which is subjected to precise attenuation by the numerical-control attenuation circuit and an RCC bridge-type simulation attenuation network, and the amplitude of the signal after being attenuated is adjusted in a closed-loop manner through the signal feedback circuit so as to obtain a microvolt alternating-current signal.
Description
technical field [0001] The invention relates to a signal generating device, in particular to a microvolt-level AC signal generating device. Background technique [0002] With the development of science and technology, signal sources are widely used in communication, measurement and control, navigation, radar and other fields. As the core technology of the signal source, the signal generating device must meet the requirements of adjustable output amplitude and adjustable frequency. Traditional signal sources generally use DDS to generate frequency-adjustable signals, and use analog potentiometers or digital potentiometers to adjust the output voltage. Although the application of these technologies can make signal sources better meet the above requirements, the common problem is that the frequency band is not wide enough. , low amplitude accuracy, large signal noise and other defects. For more stringent requirements such as outputting high-precision, low-amplitude, modulable...
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IPC IPC(8): G05F1/12
Inventor 阳敏禹云辉
Owner CHANGSHA MINYUAN ELECTRONICS