CN202841056U - High precision digital multifunctional function signal generator - Google Patents
High precision digital multifunctional function signal generator Download PDFInfo
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- CN202841056U CN202841056U CN 201220132990 CN201220132990U CN202841056U CN 202841056 U CN202841056 U CN 202841056U CN 201220132990 CN201220132990 CN 201220132990 CN 201220132990 U CN201220132990 U CN 201220132990U CN 202841056 U CN202841056 U CN 202841056U
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Abstract
Provided is a high-precision digital multifunctional function signal generator. The function signal generator comprises a microprocessor, wherein the microprocessor is connected with a touch screen, a communication interface and a DDS chip; the DDS chip is connected with a passive low pass filter and a programmable counter respectively, wherein the programmable counter is connected with a nonvolatile memory; the nonvolatile memory is connected with an active low pass filter; both the passive and active low pass filters are connected with a signal amplification circuit, wherein the output terminal of the signal amplification circuit is successively connected with a signal program-control attenuation circuit and a driving output circuit; and the microprocessor is connected with the nonvolatile memory. The high-precision digital multifunctional function signal generator has the advantages of low cost, small size, low power consumption, high precision, small error, multiple waveforms, and wide frequency band range.
Description
Technical field
The utility model relates to the multi-functional function signal generator of a kind of high-precision digital.
Background technology
The implementation of function signal generator has a lot, mainly contains following several:
1, the digital function signal generator that adopts microprocessor and Digital To Analog Convert directly to synthesize.Sort signal generator price is low, good reliability in low-frequency range, and volume is little, and is low in energy consumption, but is subject to the restriction of microprocessor, and output signal frequency is low, is difficult to realize high-frequency signal output.
2, adopt the single-chip Integrated Solution, namely single-chip integrated signal generating function can be realized sine wave, triangular wave, square wave etc.This type of scheme realizes simple, but the output waveform kind fixes, and frequency range is limited.
3, adopt the DDS technology to realize the function signal generating function.These class methods are taken a sample a sinusoidal signal, quantize, encode, form a table of natural sines, exist among the EPROM, change phase increment by the frequency control word that changes phase accumulator when synthetic, make the difference of the number of sampling in the one cycle, thereby realize the program control method of frequency.For realizing high-frequency signal output, usually adopt FPGA to realize.This scheme cost is high, and precision is low, the phase noise of output spectrum is large.
Summary of the invention
The purpose of this utility model has been to provide that a kind of cost is low, volume is little, low in energy consumption, precision is high, error is little, many waveforms, the wide multi-functional function signal generator of high-precision digital of frequency band range.
For reaching the goal of the invention the technical solution adopted in the utility model be:
The multi-functional function signal generator of high-precision digital, it is characterized in that: comprise microprocessor, be connected with touch-screen on the described microprocessor, communication interface, the DDS chip, described DDS chip respectively with passive low ventilating filter, programmable counter connects, described programmable counter is connected with nonvolatile storage, described nonvolatile storage is connected with active low-pass filter, described passive low ventilating filter and active low-pass filter all are connected with signal amplification circuit, the output of described signal amplification circuit is connected with the program control attenuator circuit of signal in turn, the driver output circuit, described microprocessor is connected with nonvolatile storage;
Described touch-screen, communication interface are used for sending frequency control word, signal amplitude, output waveform kind, Wave data parameter information to microprocessor;
Described microprocessor be used for to receive the parameter information that touch-screen or communication interface are sent, and output relevant control command information is to the DDS chip, or output waveform data to nonvolatile storage is stored;
Described DDS chip be used for to receive the relevant control instruction of microprocessor output and sine wave output signal to passive low ventilating filter, provides clock input signal to programmable counter;
Described nonvolatile storage is used for the Wave data of storage microprocessor output;
Described programmable counter is used for providing the address scan signal, and active low-pass filter is exported in the scanning of the Wave data in the nonvolatile storage;
The signal that described passive low ventilating filter and active low-pass filter are used for receiving carries out filtering, and the signal behind the output filtering is to signal amplification circuit;
The filtered signal that described signal amplification circuit is used for receiving amplifies, and the signal after will amplifying is exported to the program control attenuator circuit of signal;
The program control attenuator circuit of described signal be used for to be adjusted the signal amplitude after the amplification that receives, and the signal after will adjusting is exported to the driver output circuit;
Described driver output circuit is used for the signal after signal amplitude is adjusted in reception, and with its output.
Further, described DDS chip comprises the output clock input signal to the comparator of programmable counter, and described comparator is connected with the passive low ventilating filter that provides the clock input source to it.
Further, described DDS chip is the AD9851 chip.
When the utility model uses, at first send the parameters such as frequency control word, signal amplitude, output waveform kind, Wave data to microprocessor by touch-screen or communication interface.During sine wave output, the control words such as microprocessor transmission frequency, phase place are to the DDS chip, the sine wave output of DDS chip is to passive low ventilating filter, the discrete sine ripple is carried out low-pass filtering, and the sine wave of filtering is exported after adjusting signal amplitude, driver output drives by signal amplification circuit amplifying signal, the program control attenuator circuit of signal.
During the waveforms such as output triangular wave, sawtooth waveforms, square wave, the Wave data that obtains from touch-screen writes to nonvolatile storage by microprocessor, perhaps by communication interface Wave data is write to nonvolatile storage by microprocessor.Provide the address scan signal by programmable counter, Wave data in the nonvolatile storage is scanned output one by one, carry out filtering by active low-pass filter and obtain smooth waveform, by signal amplification circuit signal is amplified, by exporting after the program control attenuator circuit adjustment signal amplitude of signal and the driver output drives.The input clock signal of programmable counter is provided by the high-speed comparator of DDS chip internal, and the clock input signal of comparator is provided after by passive low ventilating filter filtering by the discrete sine signal of DDS chip output.
The random waveform data that are stored in the nonvolatile storage can artificially be drawn acquisition by touch-screen, also the Wave data on the PC can be sent by communication interface to obtain.
The beneficial effects of the utility model: cost is low, volume is little, low in energy consumption, precision is high, error is little, many waveforms, frequency band range are wide.
Description of drawings
Fig. 1 is theory diagram of the present utility model.
Embodiment
Come the utility model is further specified below in conjunction with specific embodiment, but the utility model is not confined to these embodiments.One skilled in the art would recognize that the utility model contained all alternatives, improvement project and the equivalents that may comprise in claims scope.
With reference to Fig. 1, the multi-functional function signal generator of high-precision digital, comprise microprocessor 3, be connected with on the described microprocessor 3 and touch 1, communication interface 2, DDS chip 4, described DDS chip 4 respectively with passive low ventilating filter 6, programmable counter 5 connects, described programmable counter 5 is connected with nonvolatile storage 7, described nonvolatile storage 7 is connected with active low-pass filter 9, described passive low ventilating filter 6 is connected with active low-pass filter and all is connected with signal amplification circuit 8, the output of described signal amplification circuit 8 is connected with the program control attenuator circuit 10 of signal in turn, driver output circuit 11, described microprocessor 3 is connected with nonvolatile storage 7;
Described touch-screen 1, communication interface 2 are used for sending frequency control word, signal amplitude, output waveform kind, Wave data parameter information to microprocessor 3;
Described microprocessor 3 is used for receiving the parameter information that touch-screen 1 or communication interface 2 are sent, and output relevant control command information is to DDS chip 4, or output waveform data is to nonvolatile storage 7 storages;
Described DDS chip 4 is used for receiving the relevant control instruction of microprocessor 3 outputs and sine wave output signal to passive low ventilating filter 6, provides clock input signal to programmable counter 5;
Described nonvolatile storage 7 is used for the Wave data of storage microprocessor 3 outputs;
Described programmable counter 5 is used for providing the address scan signal, and active low-pass filter 9 is exported in the scanning of the Wave data in the nonvolatile storage 7;
Described passive low ventilating filter 6 carries out filtering with the signal that active low-pass filter 9 is used for receiving, and the signal behind the output filtering is to signal amplification circuit 8;
The filtered signal that described signal amplification circuit 8 is used for receiving amplifies, and the signal after will amplifying is exported to the program control attenuator circuit 10 of signal;
The program control attenuator circuit of described signal 10 is used for adjusting the signal amplitude after the amplification that receives, and the signal after will adjusting is exported to driver output circuit 11;
Described driver output circuit 11 is used for the signal after signal amplitude is adjusted in reception, and with its output.
Described DDS chip 4 comprises the output clock input signal to the comparator of programmable counter 5, and described comparator is connected with the passive low ventilating filter 6 that provides the clock input source to it.
Described DDS chip 4 is AD9851 chips.
When the utility model uses, at first send the parameters such as frequency control word, signal amplitude, output waveform kind, Wave data to microprocessor 3 by touch-screen 1 or communication interface 2.During sine wave output, the control words such as microprocessor 3 transmission frequency, phase place are to DDS chip 4, the sine wave output of DDS chip 4 is to passive low ventilating filter 6, the discrete sine ripple is carried out low-pass filtering, and the sine wave of filtering is exported after adjusting signal amplitude, 11 drivings of driver output circuit by signal amplification circuit 8 amplifying signals, the program control attenuator circuit 10 of signal.
During the waveforms such as output triangular wave, sawtooth waveforms, square wave, the Wave data that obtains from touch-screen 1 writes to nonvolatile storage by microprocessor, perhaps by communication interface 2 Wave data is write to nonvolatile storage 7 by microprocessor.Provide the address scan signal by programmable counter 5, Wave data in the nonvolatile storage 7 is scanned output one by one, carry out filtering by active low-pass filter 9 and obtain smooth waveform, signal is amplified output after adjusting signal amplitudes and driver output circuit 11 and drive by the program control attenuator circuit 10 of signal by signal amplification circuit 8.The input clock signal of programmable counter 5 is provided by the high-speed comparator of DDS chip 4 inside, and the clock input signal of comparator is provided after by passive low ventilating filter 6 filtering by the discrete sine signal of DDS chip 4 output.
Claims (3)
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220132990 CN202841056U (en) | 2012-03-31 | 2012-03-31 | High precision digital multifunctional function signal generator |
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| CN 201220132990 CN202841056U (en) | 2012-03-31 | 2012-03-31 | High precision digital multifunctional function signal generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108287504A (en) * | 2018-01-23 | 2018-07-17 | 江西省智成测控技术研究所有限责任公司 | A kind of device and method that laser drive signal generator is calibrated automatically |
-
2012
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108287504A (en) * | 2018-01-23 | 2018-07-17 | 江西省智成测控技术研究所有限责任公司 | A kind of device and method that laser drive signal generator is calibrated automatically |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20150331 |
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| EXPY | Termination of patent right or utility model |