CN117742444A - High-performance low-frequency broadband vector signal generating circuit and method - Google Patents
High-performance low-frequency broadband vector signal generating circuit and method Download PDFInfo
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- CN117742444A CN117742444A CN202311696728.8A CN202311696728A CN117742444A CN 117742444 A CN117742444 A CN 117742444A CN 202311696728 A CN202311696728 A CN 202311696728A CN 117742444 A CN117742444 A CN 117742444A
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Abstract
The invention discloses a high-performance low-frequency broadband vector signal generating circuit and a method, vector waveform synthesized data are connected with a data input port of an FPGA (1) through a digital circuit (6), a high-speed digital-to-analog converter (2) is connected with a data output port of the FPGA (1) through a digital circuit (7), the high-speed digital-to-analog converter (2) is connected with an input end of a filter (3) through a radio frequency transmission line (8), the filter is connected with an input end of an amplifier (4) through a radio frequency transmission line (9), an output end of the amplifier (4) is connected with an input end of a digital potentiometer (5) through a radio frequency transmission line (10), and the digital potentiometer (5) outputs a low-frequency broadband vector signal (12); the method solves the technical problems that the prior art can only generate conventional waveforms such as sine waves, square waves, triangular waves and the like, can not realize fitting output of any waveform, has limited application range and the like.
Description
Technical Field
The invention belongs to the technical field of frequency synthesis, and particularly relates to a high-performance low-frequency broadband vector signal generating circuit and method.
Background
A low frequency signal generator is a device capable of providing various types of frequency, waveform, and output level signals. The device is used as a signal source or an excitation source for testing when measuring the amplitude characteristics, the frequency characteristics, the transmission characteristics and other parameters of various telecommunication systems or telecommunication equipment and measuring the characteristics and parameters of components, and has wide application in the production practice and the technological field. At present, low-frequency signal generating circuits mainly have two forms:
the first type is to construct a low-frequency oscillator by an RC circuit, and change the resistance and capacitance of the low-frequency oscillator by a relay to realize the switching of signals with different frequencies and amplitudes so as to generate a low-frequency signal output signal. The scheme realizes the output of the low-frequency signal, but the low-frequency vector signal cannot be generated due to the simple circuit structure and single function, and the circuit has large volume and is not beneficial to the miniaturization integration of the system.
The second type is to directly generate various standard waveform signals through the DDS. Although the circuit volume is reduced and the programmable control of the waveform is realized, the method has the defects that only conventional waveforms such as sine waves, square waves, triangular waves and the like can be generated, the fitting output of any waveform can not be realized, and the application range is limited.
Therefore, how to generate a high-performance low-frequency wideband vector signal is a technical problem to be solved in the field of low-frequency signal frequency synthesis.
Disclosure of Invention
The invention aims to solve the technical problems that: the circuit and the method for generating the high-performance low-frequency broadband vector signal are provided, so that the technical problems that the prior art can only generate conventional waveforms such as sine waves, square waves, triangular waves and the like, can not realize fitting output of any waveform, is limited in application range and the like are solved.
The technical scheme of the invention is as follows:
the high-performance low-frequency broadband vector signal generating circuit is characterized in that vector waveform synthesized data are connected with an FPGA data input port through a digital circuit, a high-speed digital-to-analog converter is connected with an FPGA data output port through a digital circuit, the high-speed digital-to-analog converter is connected with an input end of a filter through a radio frequency transmission line, the filter is connected with an input end of an amplifier through the radio frequency transmission line, an output end of the amplifier is connected with an input end of a digital potentiometer through the radio frequency transmission line, and the digital potentiometer outputs a low-frequency broadband vector signal.
The control end of the digital potentiometer is connected with the control output end of the FPGA through a digital circuit and is used for controlling the voltage dividing ratio of the digital potentiometer so as to adjust the amplitude of the low-frequency broadband vector signal.
The high-speed digital-to-analog converter is used for synthesizing the low-frequency broadband vector signal.
The FPGA is used for setting the voltage division ratio of the numerical control potentiometer through a serial bus, and simultaneously analyzing and transmitting analyzed vector waveform synthesized data through a parallel bus.
The filter is used for shaping and filtering the low-frequency broadband vector signal, and the cut-off frequency of the filter is larger than the frequency of the input signal.
A signal generation method of a high-performance low-frequency broadband vector signal generation circuit, comprising:
step 1, 3 IO ports of an FPGA are respectively connected with CLK, SEN and DATA ends of a numerical control potentiometer to form a group of SPI buses; meanwhile, the other 8 IO ports of the FPGA are respectively connected with the parallel control end of the high-speed analog-to-digital converter to form a parallel bus;
and step 2, the FPGA sends the analyzed vector waveform data to a high-speed digital-to-analog converter for waveform synthesis, and the high-performance low-frequency broadband vector signal generation is realized through waveform shaping and filtering of a filter, amplitude amplification of an amplifier and amplitude control of a numerical control potentiometer.
The invention has the beneficial effects that:
the high-performance low-frequency broadband vector signal generating circuit and the implementation method thereof can realize vector synthesis of high-quality low-frequency signals with arbitrary waveforms; when the circuit is designed by adopting an FPGA (field programmable gate array) with the model of XC7K325T-2FFG676I and a high-speed digital-to-analog converter with the model of AD9739BBCZ, the high-quality low-frequency broadband vector signal generation with the frequency range of 1 Hz-300 MHz and the signal distortion degree of better than 50dB can be realized.
The invention adopts the mode of FPGA, high-speed digital-to-analog converter and digital potentiometer to realize the generation of high-performance low-frequency broadband vector signals.
The method solves the technical problems that the prior art can only generate conventional waveforms such as sine waves, square waves, triangular waves and the like, can not realize fitting output of any waveform, has limited application range and the like.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Detailed Description
The following describes in detail the technical solutions provided by the embodiments of the present specification with reference to the accompanying drawings.
The invention relates to a high-performance low-frequency broadband vector signal generating circuit, which comprises: FPGA1, high-speed digital-to-analog converter 2, filter 3, amplifier 4 and digital potentiometer 5.
Vector waveform synthesis data are connected with a data input port of the FPGA1 through a digital line 6, a high-speed digital-to-analog converter 2 is connected with a data output port of the FPGA1 through a digital line 7, the high-speed digital-to-analog converter 2 is connected with an input end of a filter 3 through a radio frequency transmission line 8, the filter is connected with an input end of an amplifier 4 through a radio frequency transmission line 9, an output end of the amplifier 4 is connected with an input end of a digital potentiometer 5 through a radio frequency transmission line 10, and the digital potentiometer 5 outputs a low-frequency broadband vector signal 12.
The control end of the digital potentiometer 5 is connected with the control output end of the FPGA1 through a digital circuit 11 and is used for controlling the voltage division ratio of the digital potentiometer 5 so as to adjust the amplitude of the low-frequency broadband vector signal 12.
The high-speed digital-to-analog converter 2 is mainly used for synthesizing high-quality low-frequency broadband vector signals.
Optionally, the filter 3 is mainly used for shaping and filtering the low-frequency broadband vector signal, and the cut-off frequency of the filter is larger than the frequency of the input signal.
Optionally, the FPGA1 is mainly configured to set a voltage division ratio of the digitally controlled potentiometer 5 through a serial bus, and simultaneously parse and send parsed vector waveform synthesized data through a parallel bus.
The control principle of the low-frequency broadband vector signal generating process by the FPGA1 is described below:
firstly, the 3 IO ports of the FPGA1 are respectively connected with the CLK, SEN, DATA end of the numerical control potentiometer 5 to form a group of SPI buses. Meanwhile, the other 8 IO ports of the FPGA1 are respectively connected with the parallel control end of the high-speed analog-to-digital converter 2 to form a parallel bus.
And secondly, the FPGA1 sends the analyzed vector waveform data to the high-speed digital-to-analog converter 2 for waveform synthesis, and the purpose of generating high-performance low-frequency broadband vector signals is realized through waveform shaping and filtering of the filter 3, amplitude amplification of the amplifier 4 and amplitude control of the numerical control potentiometer 5.
Therefore, the embodiment provides a concept of a high-performance low-frequency broadband vector signal generating circuit, and a feasible implementation mode is provided for vector synthesis of high-performance low-frequency signals by adopting a mode of an FPGA (field programmable gate array), a high-speed digital-to-analog converter and a digital potentiometer, so that the existing problems in the field are effectively solved, and the beneficial characteristics of simple structure, random waveform editing, high circuit integration degree and the like are obtained.
Claims (6)
1. A high-performance low-frequency broadband vector signal generating circuit is characterized in that: vector waveform synthesis data are connected with a data input port of the FPGA (1) through a digital circuit (6), a high-speed digital-to-analog converter (2) is connected with a data output port of the FPGA (1) through a digital circuit (7), the high-speed digital-to-analog converter (2) is connected with an input end of a filter (3) through a radio frequency transmission line (8), the filter is connected with an input end of an amplifier (4) through a radio frequency transmission line (9), an output end of the amplifier (4) is connected with an input end of a digital potentiometer (5) through a radio frequency transmission line (10), and the digital potentiometer (5) outputs a low-frequency broadband vector signal (12).
2. The high-performance low-frequency broadband vector signal generating circuit according to claim 1, wherein: the control end of the digital potentiometer (5) is connected with the control output end of the FPGA (1) through a digital circuit (11) and is used for controlling the voltage division ratio of the digital potentiometer (5) so as to adjust the amplitude of the low-frequency broadband vector signal (12).
3. The high-performance low-frequency broadband vector signal generating circuit according to claim 1, wherein: the high-speed digital-to-analog converter (2) is used for synthesizing the low-frequency broadband vector signal.
4. The high-performance low-frequency broadband vector signal generating circuit according to claim 1, wherein: the FPGA (1) is used for setting the voltage division ratio of the numerical control potentiometer (5) through a serial bus and simultaneously analyzing and transmitting analyzed vector waveform synthesized data through a parallel bus.
5. The high-performance low-frequency broadband vector signal generating circuit according to claim 1, wherein: the filter (3) is used for shaping and filtering the low-frequency broadband vector signal, and the cut-off frequency of the filter (3) is larger than the frequency of the input signal.
6. A signal generating method of a high-performance low-frequency broadband vector signal generating circuit according to claim 1, wherein: comprising the following steps:
step 1, 3 IO ports of the FPGA (1) are respectively connected with CLK, SEN and DATA ends of a numerical control potentiometer (5) to form a group of SPI buses; meanwhile, the other 8 IO ports of the FPGA (1) are respectively connected with the parallel control end of the high-speed analog-to-digital converter (2) to form a parallel bus;
and 2, the FPGA (1) sends the analyzed vector waveform data to the high-speed digital-to-analog converter (2) for waveform synthesis, and the high-performance low-frequency broadband vector signal generation is realized through waveform shaping and filtering of the filter (3), amplitude amplification of the amplifier (4) and amplitude control of the numerical control potentiometer (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311696728.8A CN117742444A (en) | 2023-12-10 | 2023-12-10 | High-performance low-frequency broadband vector signal generating circuit and method |
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| CN202311696728.8A CN117742444A (en) | 2023-12-10 | 2023-12-10 | High-performance low-frequency broadband vector signal generating circuit and method |
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| CN117742444A true CN117742444A (en) | 2024-03-22 |
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