CN204883283U - Wave form produces circuit - Google Patents
Wave form produces circuit Download PDFInfo
- Publication number
- CN204883283U CN204883283U CN201520699928.3U CN201520699928U CN204883283U CN 204883283 U CN204883283 U CN 204883283U CN 201520699928 U CN201520699928 U CN 201520699928U CN 204883283 U CN204883283 U CN 204883283U
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- main control
- generating circuit
- analog converter
- control unit
- waveform generating
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Abstract
The utility model discloses a wave form produces circuit, include, main control unit, input interface unit, display element, digital analog converter, current -to -voltage convertor and band pass filter, wherein, the main control unit is connected respectively input interface unit, digital analog converter and display element, the main control unit passes through digital analog converter and produces PWM signal and warp band pass filter filtering base frequency signal output sine wave signal. The utility model discloses a wave form produces circuit, its is small, and circuit structure is simple, and it is convenient to adjust, and the consumption is little, can produce PWM ripples and sine wave, and the frequency range is adjustable, and the sinusoidal wave wave form signal of production is also more stable.
Description
Technical field
The utility model relates to a kind of signal generation apparatus, specifically, relates to a kind of Waveform generating circuit.
Background technology
Whether Waveform generating circuit is a kind of data signal generator, when debug hardware, usually needs to add some signals, normal to observe circuit working.Namely introduce positive feedback to integrated transporting discharging, coordinate suitable amplitude limit measure, stable periodicity vibration can be produced.
Traditional Waveform generating circuit can be built by hardware circuit completely, and it changes frequency by the resistance capacitance value in regulating circuit, but the waveform that this circuit exports is unstable, and adjustable extent is little, and hardware circuit is complicated.Especially, when signal frequency is lower, the RC value of needs is very large, its to the precision of resistance capacitance and quality requirements very high.
Utility model content
For solving the problems of the technologies described above, the utility model provides a kind of Waveform generating circuit, it comprises, main control unit, input interface unit, display unit, digital to analog converter, current-to-voltage convertor and bandpass filter, wherein, described main control unit connects described input interface unit, digital to analog converter and display unit respectively, and described main control unit is by digital to analog converter generation pwm signal and through described bandpass filter filtering fundamental frequency signal sine wave output signal.
Preferably, described main control unit adopts STC89C51 chip.
Preferably, described display unit is LCDs.
Preferably, the centre frequency of described bandpass filter and bandwidth can manual adjustments.
Preferably, described digital to analog converter is the D/A converter of DACO832.
Preferably, between described current-to-voltage convertor and bandpass filter, be also provided with output amplifier, described output amplifier comprises operational amplifier OPA551 chip.
Preferably, described input interface unit comprises selection key switch and potentiometer.
Compared with prior art, a kind of Waveform generating circuit described in the utility model, its volume is little, and circuit structure is simple, and easy to adjust, power consumption is little, can produce PWM ripple and sine wave, and Frequency and Amplitude is adjustable.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the Waveform generating circuit disclosed in the utility model embodiment.
Embodiment
For making those skilled in the art understand the technical solution of the utility model better, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as to restriction of the present utility model.
With reference to shown in Fig. 1, a kind of Waveform generating circuit disclosed in the utility model embodiment, comprise, main control unit 10, input interface unit 20, display unit 30, digital to analog converter 40, current-to-voltage convertor 50 and bandpass filter 60, wherein, described main control unit 10 connects described input interface unit 20, digital to analog converter 40 and display unit 30 respectively, and described main control unit 10 produces pwm signal by digital to analog converter 40 and through described bandpass filter 60 filtering fundamental frequency signal sine wave output signal.
Specifically, described input interface unit 20 mainly selects the frequency and the dutycycle that need the waveform (mainly PWM ripple) produced; Described main control unit 10 can adopt STC89C51 single-chip microcomputer to control, described main control unit 10 can detect the output signal of input interface unit 20, and the output action of input interface unit 20 is shown on described display unit 30, and control described digital to analog converter 40, described display unit is LCDs, as LCM12864M, finally produce waveform pattern to show, comprise the periodic waveforms such as sine wave, square wave triangular wave or pulsating wave; Described digital to analog converter 40, is converted to analog quantity by digital quantity, exports as current signal, and described digital to analog converter adopts model to be the D/A converter of DACO0832, and it is the D/A converter of 8; Current-to-voltage convertor 50, is converted to voltage signal by the current signal of reception, through effect and the exportable PWM ripple of current-to-voltage convertor 50; Because cyclical signal carries out Fourier expansion, namely each harmonic component is obtained, therefore fundamental frequency signal is obtained after bandpass filter 60 filtering, export and be the sine wave with pwm signal same frequency, utilize bandpass filter, produced by pwm signal filtering sinusoidal wave, also can avoid cannot making large problem because data point required in a certain cycle causes that waveform frequency occurs too much.In addition, centre frequency and the bandwidth of the bandpass filter 60 in the utility model are adjustable, can produce the sine wave of various frequency in principle, therefore for various frequency, as long as be transferred to suitable position, just the frequency component of energy filtering except fundamental frequency, obtains the waveform of standard.
In order to improve the driving force of output voltage waveforms, output amplifier is added between current-to-voltage convertor and bandpass filter, and preferably adopt OPA551 chip, to provide powerful current output capability, guarantee to export the sine waveform obtained more reliable.In addition, the input interface unit in the utility model comprises corresponding selection key switch and potentiometer, and selection key switch can be selected to export corresponding voltage waveform, and potentiometer is used for the waveform frequency, range value etc. of regulation output.
A kind of Waveform generating circuit disclosed in the utility model, its volume is little, and circuit structure is simple, and easy to adjust, power consumption is little, can produce PWM ripple and sine wave, and Frequency and Amplitude is adjustable, and the sine wave signal of generation is also more stable.
Above-mentioned explanation illustrate and describes some preferred embodiments of the present utility model, but as previously mentioned, be to be understood that the utility model is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in utility model contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from spirit and scope of the present utility model, then all should in the protection domain of the utility model claims.
Claims (7)
1. a Waveform generating circuit, it is characterized in that comprising, main control unit, input interface unit, display unit, digital to analog converter, current-to-voltage convertor and bandpass filter, wherein, described main control unit connects described interface circuit, digital to analog converter and display unit respectively, and described main control unit produces pwm signal by digital to analog converter and exports through described bandpass filter filtering fundamental frequency signal and obtains corresponding waveform.
2. Waveform generating circuit as claimed in claim 1, it is characterized in that, described main control unit is STC89C51 chip.
3. Waveform generating circuit as claimed in claim 1, it is characterized in that, described display unit is LCDs.
4. Waveform generating circuit as claimed in claim 1, it is characterized in that, the centre frequency of described bandpass filter and bandwidth can manual adjustments.
5. Waveform generating circuit as claimed in claim 1, it is characterized in that, described digital to analog converter is the D/A converter of DACO832.
6. Waveform generating circuit as claimed in claim 1, it is characterized in that, between described current-to-voltage convertor and bandpass filter, be also provided with output amplifier, described output amplifier comprises operational amplifier OPA551 chip.
7. Waveform generating circuit as claimed in claim 1, it is characterized in that, described input interface unit comprises selection key switch and potentiometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520699928.3U CN204883283U (en) | 2015-09-10 | 2015-09-10 | Wave form produces circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520699928.3U CN204883283U (en) | 2015-09-10 | 2015-09-10 | Wave form produces circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204883283U true CN204883283U (en) | 2015-12-16 |
Family
ID=54827639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520699928.3U Expired - Fee Related CN204883283U (en) | 2015-09-10 | 2015-09-10 | Wave form produces circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204883283U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067082A (en) * | 2020-10-10 | 2020-12-11 | 安图实验仪器(郑州)有限公司 | Liquid level detection circuit module based on MCU |
-
2015
- 2015-09-10 CN CN201520699928.3U patent/CN204883283U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067082A (en) * | 2020-10-10 | 2020-12-11 | 安图实验仪器(郑州)有限公司 | Liquid level detection circuit module based on MCU |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 |