CN205427529U - Can adjust signal source circuit of output signal parameter through host computer - Google Patents
Can adjust signal source circuit of output signal parameter through host computer Download PDFInfo
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- CN205427529U CN205427529U CN201620208277.8U CN201620208277U CN205427529U CN 205427529 U CN205427529 U CN 205427529U CN 201620208277 U CN201620208277 U CN 201620208277U CN 205427529 U CN205427529 U CN 205427529U
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Abstract
The utility model discloses a can adjust signal source circuit of output signal parameter through host computer, including singlechip, digital potentiometer and MAX038 chip, digital potentiometer's hot end is connected with power VCC, digital potentiometer's cold end ground connection, and digital potentiometer's slip end is connected with the duty cycle adjusted end of MAX038 chip, and digital potentiometer's controlled end is continuous with the output of singlechip, simulation electronic switch's common port COM is connected with the outside capacitance connection end of MAX038 chip, simulation electronic switch's numerical control gating end is connected with the delivery outlet of singlechip, the power control input ground connection of AX038 chip. The utility model has the advantages of the regulation of output signal parameter no longer relies on dial switch of a great variety with setting for, and system design simplifies, user convenient to use moreover, system intelligent competent.
Description
Technical field
This utility model relates to a kind of signal source circuit, a kind of signal source circuit that can be realized the parameters numberization regulations such as output signal dutycycle and frequency by host computer, belongs to signal and occurs and control technical field.
Background technology
Signal source circuit system can produce some specific periodically time function waveform (common are sine wave, square wave, triangular wave, sawtooth waveforms and impulse wave etc.) signal, frequency range can have a wide range of applications in electronic surveying field from micro-hertz of level to up to a hundred megahertzs.
Function signal generator chip is the common core component realizing signal source circuit, such as L8038, the devices such as BA205 are applied the most widely, but their function is less, and precision is the highest, and upper frequency limit only has 3000kHz, the signal of higher frequency cannot be produced, socket mode also underaction, frequency and dutycycle can not independent regulation, the two influences each other.The MAX038 chip that Maxim company of the U.S. produces the most more is applied, this chip modelled signal source circuit is used not only to design simply, the various waveshape signals of same frequency signal can be generated, and Multi-waveshape signal generator can be constituted with minimum outer member.
But generally there are following two aspect defects in terms of output signal parameter adjustment and setting in the signal source circuit using AX038 chip to realize in prior art:
(1) regulation of dutycycle and setting: generally dutycycle is fixed as 50%, or need to realize manually regulation by multiple gear on-offs: No. 7 pins of MAX038 chip are that dutycycle adjusts end, adjust this port voltage, output waveform dutycycle 15%～85% can be realized adjust, prior art is realized the selection (being controlled the break-make of certain electrical nodes with specific voltage and No. 7 pins of MAX038 chip by a toggle switch) of No. 7 pin voltage of MAX038 chip typically by multiple toggle switch, one corresponding electrical nodes with specific voltage of toggle switch, obviously this can cause circuit complicated, and owing to too many gear on-off can not be arranged, therefore signal dutyfactor selects limited, the signal with various dutycycle can not be produced.
null(2) regulation of frequency and setting: with MAX038 chip as the signal source circuit of core，Output waveform frequency is by the input current of No. 10 pins (control current input terminal)、The capacitance of No. 5 pins (external capacitive connection end) and the magnitude of voltage of No. 8 pins (frequency regulation input) together decide on，Under common occasion，The voltage of No. 8 pins is set to 0V，When being 0V by the voltage of No. 8 pins，Output waveform frequency is only determined by the input current of No. 10 pins and the capacitance of No. 5 pins，And，Output signal automatic wave band switching (that is to say that the significantly gear of output signal frequency adjusts) is completed typically by No. 5 connect electric capacity of pin of switching，But electric capacity switching mode widely used in currently available technology is all the several toggle switch of manual toggle，The electric capacity of connection corresponding with certain toggle switch is connected with No. 5 pins of MAX038 chip，Therefore the toggle switch using more than at least 5 is realized the adjustment of output signal frequency significantly gear by system.
In sum, in prior art, the parameter regulation of signal source circuit needs to rely on substantial amounts of manual toggle switch to realize with setting, and this makes signal source system design complexity, and makes troubles owing to being provided with the use also to user of the too much toggle switch.
Utility model content
For deficiencies of the prior art, the purpose of this utility model is how to provide the regulation of a kind of output signal parameters and setting to be independent of a large amount of toggle switch, and system design is simple, the signal source circuit that user is easy to use.
To achieve these goals, this utility model have employed following technical scheme.
A kind of signal source circuit that can be regulated output signal parameter by host computer, it is characterised in that: include single-chip microcomputer, simulant electronic switch, digital regulation resistance, potentiometer and MAX038 chip；
Described MAX038 chip has first waveform and selects end, the second waveform selection end, dutycycle to adjust end, external capacitive connection end, frequency regulation input, control current input terminal, reference voltage output end and signal output part；
The hot end of described digital regulation resistance is connected with power supply VCC, the cold end ground connection of digital regulation resistance, and the sliding end of digital regulation resistance adjusts end with the dutycycle of MAX038 chip and is connected, and the controlled end of digital regulation resistance is connected with the outfan of single-chip microcomputer；
One end of the first input/output port I01 and the first electric capacity C1 of simulant electronic switch is connected, the other end ground connection of the first electric capacity C1；One end of the second input/output port I02 and the second electric capacity C2 of simulant electronic switch is connected, the other end ground connection of the second electric capacity C2；One end of the 3rd input/output port I03 and the 3rd electric capacity C3 of simulant electronic switch is connected, the other end ground connection of the 3rd electric capacity C3；One end of the 4th input/output port I04 and the 4th electric capacity C4 of simulant electronic switch is connected, the other end ground connection of the 4th electric capacity C4；One end of the 5th input/output port I05 and the 5th electric capacity C5 of simulant electronic switch is connected, the other end ground connection of the 5th electric capacity C5；The external capacitive of common port COM and the MAX038 chip of simulant electronic switch is connected end and is connected；The numerical control gating end of simulant electronic switch is connected with the delivery outlet of single-chip microcomputer；
One of described potentiometer is fixing, and end is connected with the tap terminals of potentiometer, the tap terminals of described potentiometer is connected with the reference voltage output end of described MAX038 chip, another fixing end of described potentiometer is connected with the control current input terminal of MAX038 chip, the frequency regulation input end grounding of MAX038 chip；Described single-chip microcomputer is connected with computer by serial ports.
Compared to existing technology, this utility model has the advantage that
In this utility model, the hot end of digital regulation resistance is connected with power supply VCC, the cold end ground connection of digital regulation resistance, the sliding end of digital regulation resistance adjusts end with the dutycycle of MAX038 chip and is connected, therefore digital regulation resistance actually constitutes a pressure regulator, the controlled end of Single-chip Controlling digital regulation resistance makes the sliding end current potential of digital regulation resistance be controlled, therefore, it is possible to the dutycycle of MAX038 chip signal output is controlled, to sum up, in this utility model, single-chip microcomputer is by sending the digital signal i.e. dutycycle of scalable signal source circuit output signal to the controlled end of digital regulation resistance.
In this utility model, each input/output port of simulant electronic switch is connected with one end of each electric capacity respectively, the common port of simulant electronic switch then external capacitive with MAX038 chip is connected end and is connected, therefore simulant electronic switch can arbitrarily gate under the control of single-chip microcomputer any one for the electric capacity regulating output signal frequency, this make output signal frequency adjust realize digitized.
Again due in this utility model, single-chip microcomputer is connected with computer by serial ports, therefore user can be by needing the output signal parameter set to pass to single-chip microcomputer as the computer of host computer, single-chip microcomputer is used for being controlled achieving to digital regulation resistance and simulant electronic switch the digitized regulation of output signal parameter by controlling data and sets again, this not only eliminates the use of a large amount of toggle switch, the regulation making output signal parameter eliminates the reliance on miscellaneous toggle switch with setting, simplify system design, and it is convenient for users, improve the intelligent level of system.
Accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present utility model；
Detailed description of the invention
With detailed description of the invention, this utility model is described in further detail below in conjunction with the accompanying drawings.
As it is shown in figure 1, a kind of signal source circuit that can be regulated output signal parameter by host computer, including single-chip microcomputer, digital regulation resistance, simulant electronic switch, potentiometer and MAX038 chip；
MAX038 chip can critically produce triangular wave, sawtooth waveforms, square wave (containing square wave), sine wave signal.It is mainly characterized by: frequency range, from 0.1Hz～20MHz, reaches as high as 40MHz, and the output amplitude of various waveforms is 2V (peak-to-peak value)；Duty cycle adjustment wide ranges, dutycycle and frequency all can individually regulate, and the two is independent of each other, and largest duty cycle range of accommodation is 15%～85%；Wave distortion is little, and the sinusoidal wave distortion factor is less than 0.75%, and duty cycle adjustment non-linear hour degree is less than 2%；Employing ± 5V dual power supply, it is allowed to have 5% excursion, source current is 80mA, and typical case's power consumption 400mW, operating temperature range is 0～70 DEG C.MAX038 chip has first waveform and selects end, the second waveform selection end, dutycycle to adjust end, external capacitive connection end, frequency regulation input, control current input terminal, reference voltage output end and signal output part.Wherein, No. 7 pins of MAX038 chip are that dutycycle adjusts end, adjust this port voltage, can realize output waveform dutycycle 15%～85% and adjust, and when this port voltage is 0, output waveform dutycycle is 50%.Output waveform frequency is by the input current of No. 10 pins (control current input terminal), the capacitance of No. 5 pins (external capacitive connection end) and the magnitude of voltage of No. 8 pins (frequency regulation input) together decide on, under common occasion, the voltage of No. 8 pins is set to 0V, when being 0V by the voltage of No. 8 pins, by the input current of No. 10 pins and the capacitance of No. 5 pins, output waveform frequency only determines that (formula is f=I/C, wherein, f is output signal frequency, I is for controlling current input terminal input current, C connects the capacitance of the connect electric capacity of end by external capacitive), and complete output signal automatic wave band switching (that is to say that the significantly gear of output signal frequency adjusts) typically by No. 5 connect electric capacity of pin of switching.
Simulant electronic switch uses CD4051 chip.CD4051 is single 8 digital control simulant electronic switches of passage, has tri-binary system numerical control gating ends of A, B and C, and CD4051 has low conduction impedance and the lowest cut-off leakage current.Amplitude be 4.5～20V digital signal can control the passage that peak-to-peak value to the analogue signal triad signal of 20V can gate in 8 passages, connect this input to common port.
Digital regulation resistance is X9313 chip, and this digital regulation resistance has following pin: " increase input pin", " lifting input pin", " hot end VH ", " cold end VL ", " hold VSS ", " sliding end VW " and " chip select input end", wherein " increase input pin", " lifting input pin" and " chip select input end" it is the controlled end of digital regulation resistance.Single-chip microcomputer uses common single-chip microcomputer.
Physical circuit annexation is:
(1) circuit structure relevant with dutycycle adjustment
The hot end of digital regulation resistance is connected with power supply VCC, the cold end ground connection of digital regulation resistance, and the sliding end of digital regulation resistance adjusts end with the dutycycle of MAX038 chip and is connected, and the controlled end of digital regulation resistance is connected with the outfan of single-chip microcomputer.
(2) circuit structure relevant with frequency regulation
One end of the first input/output port I01 and the first electric capacity C1 of simulant electronic switch is connected, the other end ground connection of the first electric capacity C1；
One end of the second input/output port I02 and the second electric capacity C2 of simulant electronic switch is connected, the other end ground connection of the second electric capacity C2；
One end of the 3rd input/output port I03 and the 3rd electric capacity C3 of simulant electronic switch is connected, the other end ground connection of the 3rd electric capacity C3；
One end of the 4th input/output port I04 and the 4th electric capacity C4 of simulant electronic switch is connected, the other end ground connection of the 4th electric capacity C4；
One end of the 5th input/output port I05 and the 5th electric capacity C5 of simulant electronic switch is connected, the other end ground connection of the 5th electric capacity C5；
The external capacitive of common port COM and the MAX038 chip of simulant electronic switch is connected end and is connected；The numerical control gating end of simulant electronic switch is connected with the delivery outlet of single-chip microcomputer；
One of described potentiometer is fixing, and end is connected with the tap terminals of potentiometer, the tap terminals of potentiometer is connected with the reference voltage output end of MAX038 chip, another fixing end of described potentiometer is connected with the control current input terminal of MAX038 chip, the frequency regulation input end grounding of MAX038 chip.
(3) circuit structure relevant with waveform selection
Selecting to realize various output waveform, the first waveform of MAX038 chip selects end and the second waveform selection end to be all connected with the outfan of single-chip microcomputer.
Additionally, due to the peak-to-peak amplitude of the various output waveforms of MAX038 is 2V, in order to be suitable for different application occasion, adding one-level filtering and amplifying circuit for it, the signal output part of MAX038 chip is connected with the input of filtering and amplifying circuit.
Utility model works principle is as follows:
(1) adjustment of dutycycle
Numbers above potentiometer connected and composed a regulating circuit, the outfan of regulating circuit is the sliding end VW of digital regulation resistance, owing to the hot end of digital regulation resistance is connected with power supply VCC, the cold end ground connection of digital regulation resistance, therefore the sliding end VW voltage of digital regulation resistance can change between supply voltage (5V) and ground voltage (0V), degree of regulation is determined by the tap number of selected digital regulation resistance, and the X9313 chip degree of regulation that this utility model detailed description of the invention is illustrated is 0.6V.During specific works, increase input pinBeing triggered by trailing edge, the direction that sliding end VW is increased or decreased towards internal counter is moved by the trailing edge that this pin occurs, lifts input pinOn logic level control the direction that digital regulation resistance sliding end VW moves；Increase input pinWith lifting input pinSignal provided by single-chip microcomputer, thus the sliding end VW voltage realizing digital regulation resistance continuously adjusts between 5V and 0V.Being connected owing to the sliding end of digital regulation resistance adjusts end with the dutycycle of MAX038 chip, therefore monolithic function realizes the dutycycle Digital Control of MAX038 chip signal output by adjusting the output voltage of regulating circuit (being made up of digital regulation resistance).The relation that the dutycycle of concrete MAX038 chip adjusts between terminal voltage and output signal dutycycle is: V=(50%-D) × 0.0575, in formula, D represents output signal dutycycle.
The Data Source being used for controlling digital regulation resistance controlled end that in certain above-mentioned principle, single-chip microcomputer sends is sent to the data of single-chip microcomputer in user by host computer, therefore user has only to as carrying out relative parameters setting on the computer of host computer, without using substantial amounts of toggle switch.
(2) frequency regulation
Single-chip microcomputer gates end (tri-binary system numerical control gating ends of A, B and C) transmission gating signal by its delivery outlet to the numerical control of simulant electronic switch can choose the first input/output port I01, the second input/output port I02 and the 3rd input/output port I03 respectively, selected input/output port is connected to common port COM, such as when A, B and C signal are 000, first input/output port IO1 is selected, it is connected to common port COM, when A, B and C signal are 001, second input/output port IO2 is selected, is connected to common port COM.And then owing to each input/output port of simulant electronic switch is connected with one end of each electric capacity respectively, the common port of simulant electronic switch then external capacitive with MAX038 chip is connected end and is connected, therefore simulant electronic switch can arbitrarily gate any one for the electric capacity regulating output signal frequency under the control of single-chip microcomputer, i.e. can determine that output signal frequency according to aforementioned formula (f=I/C), basis is as follows:
(1) MAX038 chip controls current input terminal input current I: (potentiometer connects into rheostat by potentiometer control, one of potentiometer is fixing, and end is connected with the tap terminals of potentiometer, and tap terminals is connected with the reference voltage output end of MAX038 chip, therefore MAX038 chip controls current input terminal input current I is determined by potentiometer resistance, is 20-200uA by this current settings in this utility model).
(2) external capacitive connects end connect electric capacity C: optional first electric capacity C1 to the 5th electric capacity C5 realizes 5 output signal waveband selections, the first concrete electric capacity C1 to the 5th electric capacity C5 is respectively set as 10000pF, 1000pF, 269pF, 48 and 30pF, then respective frequencies segment limit is: 2kHz-20kHz, 20kHz-200kHz, 200kHz-2MHz, 2MHz-8MHz and 8MHz-13MHz.
Certainly, the electric capacity that can also arrange more way makes optional gear more, if 8 road gears are still unsatisfactory for demand, then can arrange another sheet or multi-disc simulant electronic switch, all simulant electronic switches connected mode in circuit is the most identical, but usual 5 road gear electric capacity are enough.
Certainly user is also to send control parameter by the host computer being connected with single-chip microcomputer to realize the control of simulant electronic switch, host computer has only in its interface setting output signal wavelength band (some in 5 gears), host computer calculates the data that simulant electronic switch numerical control gating end corresponding to this gear needs, delivering the data to single-chip microcomputer, single-chip microcomputer sends data can realize waveband selection.
It should be noted that the fine setting of output signal frequency can be by what the regulation of the voltage on No. 8 pins of MAX038 chip (frequency regulation input) realized, the concrete potentiometer that can use realizes, but normal conditions also can by this foot directly in order to simplify design.
(2) waveform selection
Waveform selection the most of the present utility model can have first waveform by MAX038 chip and select the current potential of end and the second waveform selection end to realize.First waveform selects end and the second waveform selection end to be all connected with the outfan of single-chip microcomputer to realize obtaining level value, it is clear that user can also realize the selection of waveform by host computer.
To sum up, host computer can pass through chip microcontroller dutycycle, frequency, the Central Regulation of three kinds of important parameters of waveform and setting to system output signal, and this greatly facilitates the use of user.
Finally illustrate is, above example is only in order to illustrate the technical solution of the utility model and unrestricted, although this utility model being described in detail with reference to preferred embodiment, it will be understood by those within the art that, the technical solution of the utility model can be modified or equivalent, without deviating from objective and the scope of technical solutions of the utility model, it all should be contained in the middle of right of the present utility model.
Claims (2)
1. the signal source circuit that can be regulated output signal parameter by host computer, it is characterised in that: include single-chip microcomputer, simulant electronic switch, digital regulation resistance, potentiometer and MAX038 chip；
Described MAX038 chip has first waveform and selects end, the second waveform selection end, dutycycle to adjust end, external capacitive connection end, frequency regulation input, control current input terminal, reference voltage output end and signal output part；
The hot end of described digital regulation resistance is connected with power supply VCC, the cold end ground connection of digital regulation resistance, and the sliding end of digital regulation resistance adjusts end with the dutycycle of MAX038 chip and is connected, and the controlled end of digital regulation resistance is connected with the outfan of single-chip microcomputer；
One end of the first input/output port I01 and the first electric capacity C1 of simulant electronic switch is connected, the other end ground connection of the first electric capacity C1；One end of the second input/output port I02 and the second electric capacity C2 of simulant electronic switch is connected, the other end ground connection of the second electric capacity C2；One end of the 3rd input/output port I03 and the 3rd electric capacity C3 of simulant electronic switch is connected, the other end ground connection of the 3rd electric capacity C3；One end of the 4th input/output port I04 and the 4th electric capacity C4 of simulant electronic switch is connected, the other end ground connection of the 4th electric capacity C4；One end of the 5th input/output port I05 and the 5th electric capacity C5 of simulant electronic switch is connected, the other end ground connection of the 5th electric capacity C5；The external capacitive of common port COM and the MAX038 chip of simulant electronic switch is connected end and is connected；The numerical control gating end of simulant electronic switch is connected with the delivery outlet of single-chip microcomputer；
One of described potentiometer is fixing, and end is connected with the tap terminals of potentiometer, the tap terminals of described potentiometer is connected with the reference voltage output end of described MAX038 chip, another fixing end of described potentiometer is connected with the control current input terminal of MAX038 chip, the frequency regulation input end grounding of MAX038 chip；Described single-chip microcomputer is connected with computer by serial ports.
A kind of signal source circuit that can be regulated output signal parameter by host computer the most according to claim 1, it is characterised in that the described signal output part of MAX038 chip is connected with the input of filtering and amplifying circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620208277.8U CN205427529U (en) | 2016-03-09 | 2016-03-09 | Can adjust signal source circuit of output signal parameter through host computer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443097A (en) * | 2016-12-09 | 2017-02-22 | 北方民族大学 | High frequency harmonic current generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443097A (en) * | 2016-12-09 | 2017-02-22 | 北方民族大学 | High frequency harmonic current generator |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160803 Termination date: 20170309 |