CN206023725U - A kind of square wave signal generator - Google Patents
A kind of square wave signal generator Download PDFInfo
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- CN206023725U CN206023725U CN201620742175.4U CN201620742175U CN206023725U CN 206023725 U CN206023725 U CN 206023725U CN 201620742175 U CN201620742175 U CN 201620742175U CN 206023725 U CN206023725 U CN 206023725U
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Abstract
This application discloses a kind of square wave signal generator, including input equipment, DDS module, waveform selecting unit, adjustment unit, comparator and control unit.Input equipment is connected with DDS module, and DDS module is connected with waveform selecting unit, and waveform selecting unit is connected with comparator, and control unit is connected with DDS module, waveform selecting unit and adjustment unit.By different initial signals being chosen respectively in low frequency and during high frequency be used as initial waveform, wherein, select soon along pulse signal during low frequency, basic waveform signal is selected during high frequency, again by comparator circuit enter line level compare with after shaping, obtain edge faster, shake the fine adjustable low-frequency square-wave of lower, dutycycle, obtain edge faster, shake lower high frequency square wave, fast along pulse signal and the advantage of comparator circuit so as to have concurrently.
Description
Technical field
The application is related to electronic instrumentation, more particularly to a kind of square wave signal generator.
Background technology
DDS (Direct Digital Synthesizer) is Direct Digital Synthesizer, can produce basic waveform
Signal, the conventional method for producing square-wave signal at present have two kinds：A kind of is the comparator circuit that is built using discrete component, right
The basic waveform signal that DDS is produced enters line level and compares and obtains square-wave signal with shaping；Another kind is for different needs, leads to
Cross and corresponding square wave data are filled into waveform data memory, then square-wave signal is directly exported with the mode of DDS.The first
Have the disadvantage that signal jitter is big, trigger position is unstable, the adjustable extent very little at edge and larger, the duty cycle adjustment essence that adjusts difficulty
Degree is little.The shortcoming of another is that the size at edge is affected by square-wave signal frequency, during low frequency edge time very big (in the least
Second level), it is impossible to quick edge (nanosecond) is set, and the dutycycle minimum of a value of low-frequency signals is limited, it is impossible to fine-tuned；If
Fast edge, dutycycle finely adjustable low-frequency square-wave signal is obtained by special edge control method, causes again to account for because of edge
According to the square-wave signal that two sampled points cannot export high frequency, and so that edge will be limited by DDS sampling rates, in sample rate
When lower, edge time is bigger.
Content of the invention
The application problem to be solved be to provide one kind not only realize in low frequency square-wave signal edge faster, shake more
Low, dutycycle is finely adjustable, moreover it is possible to realize in high frequency square-wave signal edge faster, shake lower square wave signal generator.
The application provides a kind of square wave signal generator, it is characterised in that include：
Input equipment, for the parameter of square-wave signal needed for receiving user's input；
DDS module, including fast-rising pulse generator and pulse generation and basic wave generator, fast-rising pulse generator and pulse generation is used for according to ripple
Shape parameter generates the pulse wave signal with quick edge, and basic wave generator is used for generating basic wave according to waveform parameter
Signal, the waveform parameter at least include waveform frequency；
Waveform selecting unit, for selecting the signal or basic wave generator of fast-rising pulse generator and pulse generation generation to produce
Signal is used as initial waveform signal output；
Comparator, the initial waveform signal of the first input end input waveform select unit output of the comparator, second
Input is input into datum, and initial waveform signal and datum be compared by the comparator, its output end according to than
Relatively result enters line level upset, so as to export required square-wave signal.
Preferably, in above-mentioned square wave signal generator, the square wave signal generator also includes：Control unit, the control
Unit processed is connected with waveform selecting unit, and control unit controls waveform selecting unit according to the frequency values of initial waveform signal to be carried out
State switches to connect the signal output part of the signal output part or basic wave generator of fast-rising pulse generator and pulse generation.
Preferably, described control unit is also connected with DDS module, and waveform parameter is sent to DDS module, the control list
Waveform frequency in waveform parameter is also compared by unit with default frequency boundary value, when waveform frequency is higher than predeterminated frequency
Control waveform selecting unit connects the signal output part of basic wave generator, controls when waveform frequency is less than predeterminated frequency
Waveform selecting unit connects the signal output part of fast-rising pulse generator and pulse generation.
Preferably, the waveform selecting unit is selecting switch.
Preferably, the selecting switch by stir, rotate or be pressed against fast-rising pulse generator and pulse generation signal output part and
Selected between the signal output part of basic wave generator.
Preferably, the comparator is high-speed comparator.
Preferably, the basic waveform signal includes triangular wave, sine wave or normal pulsed signal.
Preferably, when the parameter includes high level, low level, pulsewidth, frequency, time delay, rise time and declines
Between.
Preferably, in above-mentioned square wave signal generator, the square wave signal generator also includes：First wave filter and second
Wave filter, first wave filter are connected with the first output end of DDS module, for the fast filtering along pulse signal, institute
State the second wave filter to be connected with the second output end of DDS module, for the filtering to basic waveform signal.
Preferably, in above-mentioned square wave signal generator, the square wave signal generator also includes：Adjustment unit, the tune
One section of section unit is connected with control unit, and the other end is connected with comparator, for the initial waveform signal, through the ratio
Enter line level compared with device to compare with reforming process, the parameter is adjusted and is revised.
The beneficial effect of the application is：The square wave signal generator passes through to choose difference respectively in low frequency and during high frequency
Initial signal as initial waveform, wherein, select soon along pulse signal during low frequency, during high frequency, select basic waveform signal, then
By comparator circuit enter line level compare with after shaping, obtain edge faster, shake the fine adjustable low frequency of lower, dutycycle
Square wave, obtain edge faster, shake lower high frequency square wave, fast along pulse signal and the advantage of comparator circuit so as to have concurrently.
Description of the drawings
A kind of square wave signal generator structured flowchart that Fig. 1 is provided for the embodiment of the present application；
A kind of theory diagram of square wave signal generator that Fig. 2 is provided for the embodiment of the present application；
Corresponding to the intersection point of the different initial waveform signals triggering edges that Fig. 3 is provided for the embodiment of the present application and same level
Slope relationship schematic diagram；
The shake schematic diagram affected by level deviation for the different initial waveform signals that the embodiment of the present application is provided by Fig. 4；
A kind of flow chart of square-wave signal production method that Fig. 5 is provided for the embodiment of the present application.
Specific embodiment
Accompanying drawing is combined below by specific embodiment to be described in further detail the application.
As shown in figure 1, a kind of square wave signal generator 1 that the application is provided, including input equipment 11, DDS module 2, control
Unit processed 3, waveform selecting unit 41, adjustment unit 51 and comparator 52.Input equipment 11 is connected with control unit 3, DDS moulds
Block 2 is connected with waveform selecting unit 41, and waveform selecting unit 41 is also connected with comparator 52, and control unit 3 is set with input
Standby 11, DDS module 2, waveform selecting unit 41 are connected with adjustment unit 51.Wherein,
Input equipment 11 is connected with control unit 3, for the parameter of square-wave signal needed for receiving user's input, the ginseng
Waveform parameter is converted into after the process of Number of the control unit 3.
First output end and the second output end of DDS module 2 first input end and respectively with waveform selecting unit 41
Two inputs are connected, and including fast-rising pulse generator and pulse generation and basic wave generator, fast-rising pulse generator and pulse generation is used for according to ripple
Shape parameter generates the pulse signal with quick edge, and basic wave generator is used for generating basic waveform according to waveform parameter
Signal, the parameter of the user input that the waveform parameter can be received for input equipment are transformed through control unit 3, may also be and deposit
The waveform parameter data being stored in the memory 31 of square wave signal generator 1, the waveform parameter at least include frequency.Wherein,
Pulse signal for Publication No. CN103178809A patent document disclosed in one kind soon along pulse signal, basic waveform signal
Including triangular wave, sine wave or normal pulsed signal.Although described soon along pulse because frequency limited cannot function as the initial of high frequency
Waveform signal and edge are limited to DDS sampling rates, but the initial waveform signal as low frequency, and described fast have along pulse signal
The characteristics of having quick edge, larger pulse-width regulated scope, square-wave signal needed for can achieve have dutycycle concurrently and can finely reconcile side
Along quick the characteristics of.For the initial waveform signal of high frequency, it is contemplated that DDS reconfigurable filters exist larger to high frequency harmonic components
Inhibitory action, in a kind of specific embodiment, it is preferable that select single-tone sinusoidal signal as the initial signal of high band.
In the embodiment having, for the ease of data storage, square wave signal generator 1 will also include memory 31, storage
Device 31 is connected with DDS module 2, control unit 3 and waveform selecting unit 41, for data storage, including fast along pulse signal
Data, basic waveform signal data or waveform parameter data.
In the embodiment having, after initial waveform signal generation, in order to filter making an uproar in waveform signal transmitting procedure
Sound, distortion and clutter, square wave signal generator 1 will also include the first wave filter 21, the second wave filter 22, the first wave filter 21 with
First output end of DDS module 2 is connected, for the fast filtering along pulse signal, the second wave filter 22 and DDS module 2
Second output end is connected, for the filtering to basic waveform signal.
Waveform selecting unit 41 is connected with comparator 52, is a kind of selecting switch, in the signal of fast-rising pulse generator and pulse generation
Carry out being selected as initial waveform signal output with the signal of basic wave generator, and the initial waveform signal is transmitted
To comparator 52.When frequency values are low frequency, waveform selecting unit 41 connects the signal output part of fast-rising pulse generator and pulse generation, selects
Soon along pulse signal as initial waveform signal；When frequency values are high frequency, waveform selecting unit 41 is connected basic wave signal and is sent out
The signal output part of raw device, selects basic waveform signal as initial waveform signal.
In the embodiment having, waveform selecting unit 41 can be by stirring, rotating or by being pressed into, in fast-rising pulse generator and pulse generation
Signal output part and the signal output part of basic wave generator between selected.In the embodiment having, waveform is selected
Select unit 41 and the break-make for realizing circuit can be driven by curtage also, in the signal output part and base of fast-rising pulse generator and pulse generation
Selected between the signal output part of this wave generator.
Control unit 2 is connected with waveform selecting unit 41, and control unit 2 controls waveform according to initial waveform signal frequency value
Select unit 41 carries out state switching, to connect the letter of the signal output part or basic wave generator of fast-rising pulse generator and pulse generation
Number output end.When frequency values are low frequency, control waveform selecting unit 41 carries out state and is switched on fast-rising pulse generator and pulse generation
Signal output part, selects soon along pulse signal as initial waveform signal；When frequency values are high frequency, waveform selecting unit is controlled
41 carry out the signal output part that state is switched on basic wave generator, select basic waveform signal to believe as initial waveform
Number.
Control unit 2 is also connected with DDS module 2, and waveform parameter is sent to DDS module 2, and described control unit 2 will also
Waveform frequency in waveform parameter is compared with frequency boundary value, the frequency boundary value can pass through control unit 2 default or
Calculate analysis to draw.When the frequency values of initial waveform signal are less than frequency boundary value, control unit 2 controls waveform selecting unit
41 signal output parts for connecting fast-rising pulse generator and pulse generation, select soon along pulse signal as initial waveform signal；Work as initial waveform
When the frequency values of signal are more than frequency boundary value, the control waveform selecting unit 41 of control unit 2 is connected basic waveform signal and is occurred
The signal output part of device, selects basic waveform signal as initial waveform signal.
The initial waveform signal of the first input end input waveform select unit output of comparator 52, the second input are input into
Initial waveform signal and datum are compared by datum, the comparator, and its output end is carried out according to comparative result
Level is overturn to waveform shaping, so as to export required square-wave signal.It is noted that as described in background, using discrete
To the basic waveform signal that DDS is produced, the comparator circuit that components and parts are built, enters that line level compares and shaping obtains square-wave signal,
There is shake big, the unstable shortcoming of trigger position.This is its side as waveform signal is in the level conversion of high and low level
Side-play amount is inevitably generated along and ideal position between, i.e., described shake.As shown in figure 3, due to trigger edge with same
Slope relationship corresponding to the intersection point of level is triangular wave 101<Sine wave 102<Soon along pulse 103, comparator is directly resulted in defeated
The square-wave signal for going out is affected to differ by comparative level skew, and concrete manifestation is the difference on jitter performance.As shown in figure 4,
Triangular wave, sine wave and fast along pulse, the side-play amount through the square-wave signal after comparator output is different, and shake size is triangular wave
101>Sine wave 102>Soon along pulse 103.The comparator 52 is high-speed comparator, takes high transformation rate and as little as possible
The mode in propagation delay time (nanosecond), enters line level to the initial waveform signal and compares and shaping so that output low
Frequency square wave and high frequency square wave are respectively provided with the characteristics of shaking lower；Meanwhile, rise time and fall time are fixed on a very little
Nominal value (picosecond), accelerate the change of waveform signal edge, not only obtain the faster high-frequency signal in edge, and improve
The edge index of square-wave signal under low sampling rate, solves the problems, such as to be limited to DDS sampling rates along pulse signal edge soon, obtains
Obtained the faster low frequency signal in edge.
In the embodiment having, initial waveform signal level relatively in, in order that output square wave edge faster, tremble
Move lower, dutycycle finely adjustable, square wave signal generator 1 also includes adjustment unit 51, one section of adjustment unit 51 and control
Unit 3 is connected, and the other end is connected with comparator 52, enters line level for the initial waveform signal through comparator 52 and compares
In reforming process, to waveform parameter, including when high level, low level, pulsewidth, frequency, time delay, rise time and decline
Between, it is adjusted and revises.
As shown in Fig. 2 square wave signal generator 1 can be required according to user, and |input paramete, the square wave letter required for output
Number, the parameter at least includes frequency.Square wave signal generator 1 is different initial by being chosen in low frequency and during high frequency respectively
Signal wherein, is selected soon along pulse signal during low frequency as initial waveform, selects basic waveform signal during high frequency, then pass through than
Compared with device circuit enter line level compare with after shaping, obtain edge faster, shake the fine adjustable low-frequency square-wave of lower, dutycycle,
Obtain edge faster, shake lower high frequency square wave, fast along pulse signal and the advantage of comparator circuit so as to have concurrently, fully inhale
The advantage of two kinds of conventional methods described in background technology has been taken, the shortcoming of two kinds of conventional methods has been overcome.
Above-mentioned square wave signal generator 1, such as Fig. 5 is based on, a kind of explanation DDS square-wave signals that the application is provided produce process
Comprise the following steps：
|input paramete.The waveform parameter of required square-wave signal is input by a user, and the waveform parameter at least includes frequency.
Generate initial waveform.Initial waveform signal is generated according to the parameter of user input, the initial waveform signal includes
Soon along pulse signal and basic waveform signal.Wherein, soon along the patent document that pulse signal is Publication No. CN103178809A
Disclosed in one kind soon along pulse signal, basic waveform signal includes triangular wave, sine wave or normal pulsed signal.
In the embodiment having, after initial waveform signal generation, also waveform signal can be filtered respectively, filter ripple
Noise, distortion and clutter in shape signals transmission.
Select initial waveform.According to waveform signal frequency values size, a kind of initial waveform signal is selected, including working as frequency
Be worth for low frequency when, select soon along pulse signal as initial waveform signal；When frequency values are high frequency, basic waveform signal is selected
As initial waveform signal.
In a kind of specific embodiment, by default or calculating one frequency boundary value of analysis, when initial waveform signal
When frequency values are less than frequency boundary value, select soon along pulse signal as initial waveform signal；Frequency when initial waveform signal
When value is more than frequency boundary value, single-tone sinusoidal signal is selected as initial waveform signal.
In the embodiment having, before plinth waveform signal is selected, also respectively Wave data can be stored, in case
Subsequently selected.
Output square wave.To select initial waveform signal, initial waveform signal and datum are compared, according to than
After relatively result enters line level upset to waveform shaping, square-wave signal needed for output.Wherein, level compares with reforming process, adopts
Take the mode in high transformation rate and propagation delay time (nanosecond) as little as possible so that the low-frequency square-wave of output and high frequency side
Ripple is respectively provided with the characteristics of shaking lower；Meanwhile, rise time and fall time are fixed on the nominal value (psec of a very little
Level), accelerate the change of waveform signal edge, not only obtain the faster high-frequency signal in edge, and improve below low sampling rate
The edge index of ripple signal, solves the problems, such as to be limited to DDS sampling rates along pulse signal edge soon, can obtain edge more
Fast low frequency signal.
In the embodiment having, initial waveform signal level compare with reforming process, can also to waveform parameter, including
High level, low level, pulsewidth, frequency, time delay, rise time and fall time, it is adjusted and revises so that output
Square wave edge is faster, the lower, dutycycle of shake is finely adjustable.
Process is produced according to the square-wave signal, can be required according to user, |input paramete, the square wave letter required for output
Number.Be used as initial waveform by different initial signals being chosen respectively in low frequency and during high frequency, wherein, select fast edge during low frequency
Pulse signal, selects basic waveform signal, then enters line level by comparator circuit to compare with after shaping during high frequency, obtain edge
Faster, shake the fine adjustable low-frequency square-wave of lower, dutycycle, obtain edge faster, shake lower high frequency square wave, so as to and
Tool has fully drawn the advantage of two kinds of conventional methods described in background technology soon along pulse signal and the advantage of comparator circuit,
Overcome the shortcoming of two kinds of conventional methods.
Above content is the further description that the application is made with reference to specific embodiment, it is impossible to assert this Shen
Being embodied as please is confined to these explanations.For the application person of an ordinary skill in the technical field, do not taking off
On the premise of conceiving from the present application, some simple deduction or replace can also be made.
Claims (10)
1. a kind of square wave signal generator, it is characterised in that include：
Input equipment, for the parameter of square-wave signal needed for receiving user's input；
DDS module, including fast-rising pulse generator and pulse generation and basic wave generator, fast-rising pulse generator and pulse generation is used for being joined according to waveform
Number generates the pulse wave signal with quick edge, and basic wave generator is used for generating basic wave letter according to waveform parameter
Number, the waveform parameter at least includes waveform frequency；
Waveform selecting unit, for the signal for selecting the signal or basic wave generator of fast-rising pulse generator and pulse generation generation to produce
As initial waveform signal output；
Comparator, the initial waveform signal of the first input end input waveform select unit output of the comparator, the second input
End input datum, initial waveform signal and datum be compared by the comparator, and its output end is according to comparing knot
Fruit enters line level upset, so as to export required square-wave signal.
2. square wave signal generator as claimed in claim 1, it is characterised in that also include control unit, described control unit
It is connected with waveform selecting unit, control unit carries out state according to the frequency values of initial waveform signal control waveform selecting unit and cuts
Change to connect the signal output part of the signal output part or basic wave generator of fast-rising pulse generator and pulse generation.
3. square wave signal generator as claimed in claim 2, it is characterised in that described control unit also respectively with input equipment
It is connected with DDS module, needed for the user input that input equipment is received, the parameter of square-wave signal is converted into waveform parameter, and by institute
State waveform parameter and be sent to DDS module, the waveform frequency in waveform parameter is also carried out with frequency boundary value by described control unit
Relatively, when waveform frequency is higher than frequency boundary value, the signal for controlling the basic wave generator of waveform selecting unit connection is defeated
Go out end, when waveform frequency is less than frequency boundary value, control the signal output that waveform selecting unit connects fast-rising pulse generator and pulse generation
End.
4. square wave signal generator as claimed in claim 1, it is characterised in that the waveform selecting unit is selecting switch.
5. square wave signal generator as claimed in claim 4, it is characterised in that the selecting switch by stirring, rotate or
Selected between the signal output part of the signal output part and basic wave generator that are pressed against fast-rising pulse generator and pulse generation.
6. square wave signal generator as claimed in claim 1, it is characterised in that the comparator is high-speed comparator.
7. square wave signal generator as claimed in claim 1, it is characterised in that the basic waveform signal include triangular wave,
Sine wave or normal pulsed signal.
8. square wave signal generator as claimed in claim 1, it is characterised in that the parameter includes high level, low level, arteries and veins
Width, frequency, time delay, rise time and fall time.
9. the square wave signal generator as any one of claim 1 to 8, it is characterised in that also include the first wave filter
With the second wave filter, first wave filter is connected with the first output end of DDS module, for the fast filter along pulse signal
Ripple, second wave filter are connected with the second output end of DDS module, for the filtering to basic waveform signal.
10. the square wave signal generator as any one of claim 1 to 8, it is characterised in that also include adjustment unit,
One end of the adjustment unit is connected with control unit, and the other end is connected with comparator, for the initial waveform signal
Compare with reforming process line level is entered through the comparator, the parameter is adjusted and is revised.
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| CN201620742175.4U CN206023725U (en) | 2016-07-14 | 2016-07-14 | A kind of square wave signal generator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768647A (en) * | 2019-11-12 | 2020-02-07 | 中电科仪器仪表有限公司 | Method and system for reducing pulse signal jitter based on edge control |
| CN110838846A (en) * | 2019-11-28 | 2020-02-25 | 山东浪潮人工智能研究院有限公司 | Clock source debugging method and arbitrary waveform generator board card |
| CN111025315A (en) * | 2019-11-28 | 2020-04-17 | 深圳奥比中光科技有限公司 | Depth measurement system and method |
-
2016
- 2016-07-14 CN CN201620742175.4U patent/CN206023725U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768647A (en) * | 2019-11-12 | 2020-02-07 | 中电科仪器仪表有限公司 | Method and system for reducing pulse signal jitter based on edge control |
| CN110768647B (en) * | 2019-11-12 | 2023-05-09 | 中电科思仪科技股份有限公司 | Method and system for reducing pulse signal jitter based on edge control |
| CN110838846A (en) * | 2019-11-28 | 2020-02-25 | 山东浪潮人工智能研究院有限公司 | Clock source debugging method and arbitrary waveform generator board card |
| CN111025315A (en) * | 2019-11-28 | 2020-04-17 | 深圳奥比中光科技有限公司 | Depth measurement system and method |
| WO2021103428A1 (en) * | 2019-11-28 | 2021-06-03 | 深圳奥比中光科技有限公司 | Depth measurement system and method |
| CN110838846B (en) * | 2019-11-28 | 2023-06-13 | 山东浪潮科学研究院有限公司 | Debugging method of clock source and arbitrary waveform generator board card |
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Address after: 518000 Guangdong Province, Baoan District, Baoan District, Xin'an Street, Xingdong Community, 68 District, Antongda Industrial Factory Area, 4 factories, 3 floors, 5 office buildings, 1-3 floors Patentee after: Shenzhen dingyang Technology Co., Ltd Address before: Shenzhen City, Guangdong province Baoan District 518000 District 68 road left three Antongda Industrial Park, 4 floor Patentee before: Shenzhen Siglent Technologies Co., Ltd. |