CN111638390A - Sweep frequency electric field generator - Google Patents
Sweep frequency electric field generator Download PDFInfo
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- CN111638390A CN111638390A CN202010560281.1A CN202010560281A CN111638390A CN 111638390 A CN111638390 A CN 111638390A CN 202010560281 A CN202010560281 A CN 202010560281A CN 111638390 A CN111638390 A CN 111638390A
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- 230000005684 electric field Effects 0.000 title claims abstract description 16
- 238000009825 accumulation Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 3
- 239000003550 marker Substances 0.000 description 7
- 238000010408 sweeping Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- General Physics & Mathematics (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention relates to the technical field of electronic measurement, in particular to a sweep frequency electric field generator, which comprises a control unit, a sweep frequency signal generating unit for generating sweep frequency signals and a frequency standard generating unit for generating frequency standard signals, wherein the signal output end of the control unit is connected with the sweep frequency signal generating unit, the signal output end of the sweep frequency signal generating unit is connected with the frequency standard generating unit, the sweep frequency signal generating unit comprises a sweep frequency control unit, a time accumulator and a memory, the frequency standard generating unit comprises a frequency point memory, a frequency standard forming unit and a state generating unit, the output end of the sweep frequency signal generating unit is sequentially connected with an adder, a carrier wave table RAM, an analog-to-digital converter and a low-pass filter, and the adder is also connected with a carrier address accumulator, the precision and the frequency resolution of the generated sweep frequency signals are improved, and a plurality of frequency standards, and less system resources are occupied.
Description
Technical Field
The invention relates to the technical field of electronic measurement, in particular to a sweep frequency electric field generator.
Background
The signal generator can generate signals with adjustable frequency, amplitude, waveform and other parameters, and may be divided into sine signal generator, pulse signal generator, function generator, arbitrary waveform generator, noise generator, frequency sweep signal generator, etc. the frequency sweep signal generator outputs frequency sweep signal with continuous frequency change in certain range and certain rule.
With the development of microelectronic technology, Field Programmable Gate Array (FPGA) technology and direct digital frequency synthesis (DDS) technology are increasingly applied to signal generators, and a DDS frequency synthesizer and a DDS controller can be implemented by the FPGA, however, the frequency sweeping signal source and the frequency sweeping method for implementing frequency sweeping can generate new frequency each time after the DDS controller calculates a frequency control word K, so that the frequency sweeping speed is relatively low, and the frequency sweeping accuracy and the frequency resolution are also reduced.
In addition, the frequency sweep signal generator not only outputs the frequency sweep signal, but also generates a frequency marker, wherein the frequency marker is the frequency definite degree in the frequency sweep measurement, namely a marker signal is output when the frequency of the frequency sweep signal changes to the marker frequency set by a user, the frequency marker is called a frequency marker for short, the basic method for generating the frequency marker in the prior art is a difference frequency method, but the difference frequency method has the defects of complex circuit and high cost; the stability and accuracy of the frequency standard are poor due to the nonlinear distortion of analog devices such as a harmonic generator, a mixer and a band-pass filter; circuit delays can cause frequency timing errors.
Disclosure of Invention
Solves the technical problem
Aiming at the defects in the prior art, the invention provides a sweep frequency electric field generator, which solves the problems that a sweep frequency signal is generated by adopting a field programmable gate array and a direct digital frequency synthesis technology, a new frequency can be generated each time after a DDS controller calculates a frequency control word K, and the sweep frequency efficiency is low, so that the sweep frequency precision and the frequency resolution are reduced; meanwhile, the difference frequency method for generating the frequency standard in the prior art has complex circuit and high cost; the nonlinear distortion of analog devices such as a harmonic generator, a mixer, a band-pass filter and the like causes poor stability and accuracy of a frequency standard; circuit delays can cause frequency timing errors.
Problem of swept frequency signal generator.
Technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a frequency sweep electric field generator comprises a control unit, a frequency sweep signal generating unit for generating frequency sweep signals and a frequency scale generating unit for generating frequency scale signals, wherein the signal output end of the control unit is connected with the frequency sweep signal generating unit, the signal output end of the frequency sweep signal generating unit is connected with the frequency scale generating unit, the frequency sweep signal generating unit comprises a frequency sweep control unit, a time accumulator and a memory, the frequency scale generating unit comprises a frequency point memory, a frequency scale forming unit and a state generating unit, the output end of the frequency sweep signal generating unit is sequentially connected with an adder, a carrier wave table RAM, an analog-to-digital converter and a low-pass filter, and the adder is also connected with a carrier address accumulator.
Furthermore, the sweep frequency control unit generates sweep frequency control parameters including sweep frequency words, carrier frequency words, sweep control accumulation words and amplitude adjustment parameters according to sweep frequency parameters and sweep frequency commands set by a user in the control unit,
the time accumulator performs phase accumulation in each clock cycle according to the sweep frequency word to generate a frequency increment of the sweep signal,
the memory is used for storing the generated frequency increment.
Furthermore, the control unit is used for receiving the sweep frequency parameters and the sweep frequency commands set by the user.
Furthermore, the state generating unit is used for generating a state flag signal according to the state enabling information and the frequency sweeping state.
Furthermore, the frequency point memory generates frequency point marking signals according to the sweep frequency control parameters, and the frequency scale forming unit generates frequency scale signals according to the effective state of the frequency point marking signals.
Furthermore, the carrier address accumulator continuously accumulates the carrier frequency words generated by the sweep frequency control unit to generate the frequency basis quantity of the sweep frequency signal.
Furthermore, the adder adds the frequency increment and the frequency base quantity to generate an address for reading the carrier wave table, and reads the sweep frequency amplitude value of the sweep frequency signal from the carrier wave table RAM.
Furthermore, the analog-to-digital converter is configured to perform digital-to-analog conversion on the sweep amplitude value to generate an analog sweep signal.
Further, the low-pass filter is configured to perform low-pass filtering on the analog swept-frequency signal to generate a swept-frequency signal.
Advantageous effects
Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:
1. the frequency sweep signal is generated by adopting a method of adding the frequency basis quantity and the frequency increment of the frequency sweep signal, so that the precision and the frequency resolution of the generated frequency sweep signal are greatly improved.
2. The frequency point marking signals corresponding to the frequency sweeping points are stored by the memory, so that a plurality of frequency marks are generated, and less system resources are occupied.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the frequency sweep signal generation of the present invention;
FIG. 3 is a schematic structural diagram of a two-channel arbitrary waveform generator implemented by the sweep signal generator of the present invention;
FIG. 4 is a diagram illustrating a daughter card configuration of the present invention;
FIG. 5 is a schematic structural diagram of a sweep signal generating unit according to the present invention;
fig. 6 is a schematic structural diagram of a frequency scale generating unit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be further described with reference to the following examples.
Examples
A swept-frequency electric field generator of the present embodiment, with reference to fig. 1 to 6: the frequency sweep signal generating device comprises a control unit, a frequency sweep signal generating unit for generating frequency sweep signals and a frequency scale generating unit for generating frequency scale signals, wherein the signal output end of the control unit is connected with the frequency sweep signal generating unit, the signal output end of the frequency sweep signal generating unit is connected with the frequency scale generating unit, the frequency sweep signal generating unit comprises a frequency sweep control unit, a time accumulator and a memory, the frequency scale generating unit comprises a frequency point memory, a frequency scale forming unit and a state generating unit, the output end of the frequency sweep signal generating unit is sequentially connected with an adder, a carrier wave table RAM, an analog-to-digital converter and a low-pass filter, and the adder is also connected with a carrier address accumulator.
Wherein, the sweep frequency control unit generates sweep frequency control parameters including sweep frequency words, carrier frequency words, sweep frequency control accumulation words and amplitude adjustment parameters according to sweep frequency parameters and sweep frequency commands set by a user in the control unit, the time accumulator performs phase accumulation in each clock period according to the sweep frequency words to generate frequency increment of sweep frequency signals, the memory is used for storing the generated frequency increment, the control unit is used for receiving the sweep frequency parameters and the sweep frequency commands set by the user, the state generation unit is used for generating state flag signals according to state enabling information and sweep frequency states, the frequency point memory generates frequency point flag signals according to the sweep frequency control parameters, the frequency point forming unit generates frequency point signals according to the effective states of the frequency point flag signals, the carrier address accumulator continuously accumulates the carrier frequency words generated by the sweep frequency control unit, the frequency base quantity of the sweep frequency signal is generated, the adder adds the frequency increment and the frequency base quantity to generate an address for reading a carrier wave table, the sweep frequency amplitude value of the sweep frequency signal is read from a carrier wave table RAM, the analog-to-digital converter is used for performing digital-to-analog conversion on the sweep frequency amplitude value to generate an analog sweep frequency signal, and the low-pass filter is used for performing low-pass filtering on the analog sweep frequency signal to generate the sweep frequency signal.
The working principle is as follows: generating frequency sweep control parameters including frequency sweep frequency words, carrier frequency words, frequency sweep control accumulation words and amplitude adjustment parameters according to frequency sweep parameters and frequency sweep commands set by a user; storing the generated frequency sweep frequency word, generating a frequency sweep control parameter comprising a frequency sweep frequency word, a carrier frequency word, a frequency sweep control accumulation word and an amplitude adjustment parameter according to a frequency sweep parameter and a frequency sweep command set by a user, storing the frequency sweep frequency word, and adjusting the frequency sweep frequency word according to the frequency sweep command; the sweep frequency range of the sweep frequency signal can be conveniently changed by adjusting the sweep frequency word, meanwhile, the area for storing a sweep frequency word wavetable is also reduced, resources are saved, the sweep frequency word in the sweep frequency word RAM is read, phase accumulation is carried out in each clock period according to the sweep frequency word, the frequency increment of the sweep frequency signal is generated, and the carrier frequency words are continuously accumulated to generate the frequency basis quantity of the sweep frequency signal; adding the frequency increment and the frequency base quantity of the sweep frequency signal to generate an address for reading a pre-stored carrier wave table RAM, and reading a sweep frequency amplitude value of the sweep frequency signal from the carrier wave table, wherein the carrier wave table stores the carrier amplitude value, the sweep frequency amplitude value is subjected to digital-to-analog conversion to generate an analog sweep frequency signal, and the analog sweep frequency signal is subjected to low-pass filtering to generate a final sweep frequency signal.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. A swept-frequency electric field generator, characterized by: the frequency sweep signal generating device comprises a control unit, a frequency sweep signal generating unit for generating frequency sweep signals and a frequency scale generating unit for generating frequency scale signals, wherein the signal output end of the control unit is connected with the frequency sweep signal generating unit, the signal output end of the frequency sweep signal generating unit is connected with the frequency scale generating unit, the frequency sweep signal generating unit comprises a frequency sweep control unit, a time accumulator and a memory, the frequency scale generating unit comprises a frequency point memory, a frequency scale forming unit and a state generating unit, the output end of the frequency sweep signal generating unit is sequentially connected with an adder, a carrier wave table RAM, an analog-to-digital converter and a low-pass filter, and the adder is also connected with a carrier address accumulator.
2. A swept electric field generator according to claim 1,
the sweep frequency control unit generates sweep frequency control parameters including sweep frequency words, carrier frequency words, sweep frequency control accumulation words and amplitude adjustment parameters according to sweep frequency parameters and sweep frequency commands set by a user in the control unit,
the time accumulator performs phase accumulation in each clock cycle according to the sweep frequency word to generate a frequency increment of the sweep signal,
the memory is used for storing the generated frequency increment.
3. A swept electric field generator as claimed in claim 1, wherein the control unit is configured to receive user-defined sweep parameters and sweep commands.
4. A swept electric field generator as claimed in claim 1, wherein the state generating unit is configured to generate the state flag signal based on the state enabling information and the swept state.
5. A swept frequency electric field generator as claimed in claim 1, wherein the frequency point memory generates a frequency point identification signal according to the sweep frequency control parameters, and the frequency scale forming unit generates a frequency scale signal according to the effective state of the frequency point identification signal.
6. A swept frequency electric field generator as claimed in claim 1, wherein the carrier address accumulator continuously accumulates carrier frequency words generated by the sweep control unit to generate a frequency basis of the swept frequency signal.
7. A swept frequency electric field generator as claimed in claim 1, wherein the adder adds the frequency increment and the frequency base quantity to generate an address for reading the carrier wave table, and reads the sweep amplitude value of the sweep signal from the carrier wave table RAM.
8. A swept frequency electric field generator as claimed in claim 1, wherein the analog-to-digital converter is configured to perform digital-to-analog conversion on the swept frequency amplitude value to generate an analog swept frequency signal.
9. A swept frequency electric field generator as claimed in claim 1, wherein the low pass filter is configured to low pass filter the analog swept frequency signal to generate a swept frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010560281.1A CN111638390A (en) | 2020-06-18 | 2020-06-18 | Sweep frequency electric field generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010560281.1A CN111638390A (en) | 2020-06-18 | 2020-06-18 | Sweep frequency electric field generator |
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| CN111638390A true CN111638390A (en) | 2020-09-08 |
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| CN202010560281.1A Pending CN111638390A (en) | 2020-06-18 | 2020-06-18 | Sweep frequency electric field generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116577536A (en) * | 2023-07-10 | 2023-08-11 | 烟台东方威思顿电气有限公司 | Three-phase alternating current standard source based on waveform-amplitude separation control |
Citations (5)
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|---|---|---|---|---|
| CN102468805A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | Sweep signal generator and method for generating sweep signals |
| CN103178843A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Signal source with frequency sweeping function and generation method thereof |
| CN103178779A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Signal generator with amplitude compensation function and method thereof |
| CN104935258A (en) * | 2014-03-18 | 2015-09-23 | 苏州普源精电科技有限公司 | Sweep signal generator capable of generating a plurality of frequency markers |
| CN205215970U (en) * | 2015-11-12 | 2016-05-11 | 中国科学院上海应用物理研究所 | Be used for proton treatment device slow extraction system linearity sweep singla generator |
-
2020
- 2020-06-18 CN CN202010560281.1A patent/CN111638390A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102468805A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | Sweep signal generator and method for generating sweep signals |
| CN103178843A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Signal source with frequency sweeping function and generation method thereof |
| CN103178779A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Signal generator with amplitude compensation function and method thereof |
| CN104935258A (en) * | 2014-03-18 | 2015-09-23 | 苏州普源精电科技有限公司 | Sweep signal generator capable of generating a plurality of frequency markers |
| CN205215970U (en) * | 2015-11-12 | 2016-05-11 | 中国科学院上海应用物理研究所 | Be used for proton treatment device slow extraction system linearity sweep singla generator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116577536A (en) * | 2023-07-10 | 2023-08-11 | 烟台东方威思顿电气有限公司 | Three-phase alternating current standard source based on waveform-amplitude separation control |
| CN116577536B (en) * | 2023-07-10 | 2023-09-15 | 烟台东方威思顿电气有限公司 | Three-phase alternating current standard source based on waveform-amplitude separation control |
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