CN204031099U - A kind of square-wave generator - Google Patents
A kind of square-wave generator Download PDFInfo
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- CN204031099U CN204031099U CN201420438030.6U CN201420438030U CN204031099U CN 204031099 U CN204031099 U CN 204031099U CN 201420438030 U CN201420438030 U CN 201420438030U CN 204031099 U CN204031099 U CN 204031099U
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Abstract
The utility model relates to a kind of square-wave generator, comprise wien-bridge oscillator, comparator, multichannel selection resistance and voltage follower, the output of described wien-bridge oscillator is connected to the input of described comparator, the output of described comparator is connected to the input of described voltage follower through the first resistance, described multichannel selects the output of resistance to be connected between the output of described comparator and the input of described voltage follower.The utility model produces sine wave signal by wien-bridge oscillator, the sine wave signal that utilizes comparator that wien-bridge oscillator is produced is converted to square wave, then utilize the first resistance and multichannel to select resistor group to become dividing potential drop modulation circuit, automatically to regulate at any time the amplitude of square wave; Finally at output, increase voltage follower, to improve the driving force of square-wave generator.
Description
Technical field
The utility model relates to a kind of square-wave generator.
Background technology
Square wave is a kind of waveform of non-sinusoidal cuve, conventionally when electronic applications and signal processing, occurs, square wave is again the control signal of many electronic systems.Square wave is the same substantially, just according to concrete applied environment, and the amplitude of the square wave needing, cycle, duty ratio difference.
At present, want to regulate the amplitude of square wave, conventionally adopt potentiometer, the resistance of manual adjustments output, and then the amplitude of adjusting square wave, this mode is not easy to regulate, low precision, and the driving force of whole square-wave generator is poor.
Utility model content
The utility model provides a kind of square-wave generator, to solve the problems of the technologies described above.
For solving the problems of the technologies described above, the utility model provides a kind of square-wave generator, comprise wien-bridge oscillator, comparator, multichannel selection resistance and voltage follower, the output of described wien-bridge oscillator is connected to the input of described comparator, the output of described comparator is connected to the input of described voltage follower through the first resistance, described multichannel selects the output of resistance to be connected between the output of described comparator and the input of described voltage follower.
Preferably, described comparator is selected dual operational amplifier, and the inverting input of described dual operational amplifier is connected to the output of described wien-bridge oscillator, and the in-phase input end of described dual operational amplifier is through the second grounding through resistance.
Preferably, described voltage follower is selected the four-operational amplifier with differential input, the in-phase input end of described four-operational amplifier is connected to the output of described comparator, and the inverting input of described four-operational amplifier is connected to the output of described four-operational amplifier.
Preferably, described multichannel selects resistance to select 8 channel selecting resistance, and the gating control end of described 8 channel selecting resistance is controlled by three binary system input pins.
Preferably, three binary system input pins in described 8 channel selecting resistance are connected with the output pin of single-chip microcomputer.
The square-wave generator that the utility model provides, comprise wien-bridge oscillator, comparator, multichannel selection resistance and voltage follower, the output of described wien-bridge oscillator is connected to the input of described comparator, the output of described comparator is connected to the input of described voltage follower through the first resistance, described multichannel selects the output of resistance to be connected between the output of described comparator and the input of described voltage follower.The utility model produces sine wave signal by wien-bridge oscillator, the sine wave signal that utilizes comparator that wien-bridge oscillator is produced is converted to square wave, then utilize the first resistance and multichannel to select resistor group to become dividing potential drop modulation circuit, automatically to regulate at any time the amplitude of square wave; Finally at output, increase voltage follower, to improve the driving force of square-wave generator.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the square-wave generator of the utility model one embodiment.
In figure: 10-wien-bridge oscillator, 20-comparator, 30-multichannel are selected resistance, 40-voltage follower.
Embodiment
For the technical scheme of the more detailed above-mentioned utility model of statement, below list specific embodiment and carry out Proof Technology effect; It is emphasized that these embodiment are not limited to limit scope of the present utility model for the utility model is described.
The square-wave generator that the utility model provides, as shown in Figure 1, comprise wien-bridge oscillator 10, comparator 20, multichannel selection resistance 30 and voltage follower 40, the output of described wien-bridge oscillator 10 is connected to the input of described comparator 20, the output of described comparator 20 is connected to the input of described voltage follower 40 through the first resistance R 1, described multichannel selects the output of resistance 30 to be connected between the output of described comparator 20 and the input of described voltage follower 40.The utility model produces sine wave signal by wien-bridge oscillator 10, the sine wave signal that utilizes comparator 20 that wien-bridge oscillator 10 is produced is converted to square wave, then utilize the first resistance R 1 and multichannel to select resistance 30 to form dividing potential drop modulation circuit, automatically to regulate at any time the amplitude of square wave; Finally at output, increase voltage follower 40, to improve the driving force of square-wave generator.
Particularly, described wien-bridge oscillator 10 comprises the 3rd, the 4th, the 5th, the 6th resistance R 3, R4, R5, R6, first, second capacitor C 1, C2 and an operational amplifier, in the present embodiment, select LM324 chip, after described the 3rd resistance R 3 is in parallel with the second capacitor C 2, the in-phase input end of one end access operational amplifier, other end ground connection, forms RC parallel circuits; After described the 4th resistance R 4 and the first capacitor C 1 series connection, be connected between the output and in-phase input end of operational amplifier, form RC series circuit; The inverting input of one end access operational amplifier of described the 6th resistance R 6, other end ground connection; Described the 5th resistance R 5 is connected between the output and inverting input of operational amplifier.The present embodiment combines formation RC oscillating circuit by RC connection in series-parallel frequency-selective network and operational amplifier, and RC connection in series-parallel frequency-selective network is connected between the output and in-phase input end of operational amplifier, forms positive feedback; Be connected on the output of operational amplifier and the 5th resistance R 5 between inverting input, form Voltage Series negative feedback.Described wien-bridge oscillator 10 not only vibrates more stable, and waveform is good, and carrying load ability is strong, and frequency of oscillation can regulate continuously easily in wider scope, and output voltage distortion is also smaller.
Preferably, please continue to refer to Fig. 1, described comparator 20 is selected dual operational amplifier, in the present embodiment, select LM358 chip, the inverting input of described dual operational amplifier is connected to the output of described wien-bridge oscillator 10, and the in-phase input end of described dual operational amplifier is through the second resistance R 2 ground connection, certainly, the pin 4 of LM358 chip needs ground connection, and pin 8 meets positive supply VCC.
Preferably, please continue to refer to Fig. 1, described voltage follower 40 is selected the four-operational amplifier with differential input, the same LM324 chip that adopts in the present embodiment, the in-phase input end of described four-operational amplifier is connected to the output of described comparator 20, the inverting input of described four-operational amplifier is connected to the output of described four-operational amplifier, thereby realizes voltage follow, improves the driving force of square-wave generator of the present utility model.
Preferably, please continue to refer to Fig. 1, described multichannel selects resistance 30 to select 8 channel selecting resistance, in the present embodiment, adopt ADG508 chip, the gating control end of described 8 channel selecting resistance is controlled by pin A, B, the C of three binary system inputs, particularly, when three pin A, B, C are respectively 0,0,0, the 7th resistance R 7 in passage S1 is connected to public output D; When three pin A, B, C are respectively 0,0,1, the 8th resistance R 8 in passage S2 is connected to public output D, and the rest may be inferred.Like this, only need to regulate the input low and high level of three pin A, B, C, can select 8 passage S1～S7, only the 7th resistance R 7 to the 14 resistance R 14 need be arranged to different resistances, can realize the adjusting of output resistance, and then regulate the amplitude of square wave.Certainly, the vdd terminal of ADG508 chip need be connected to positive supply VCC, and GND end needs ground connection.
Preferably, three binary system input pins in described 8 channel selecting resistance are connected with the output pin of single-chip microcomputer (not shown), that is to say, use the incoming level of Single-chip Controlling three pin A, B, C, can select fast as required needed amplitude, also can be set by the user and select automatically afterwards, more convenient adjusting; In addition, can also fixing resistance (R7～R14) need to be done to corresponding replacing according to concrete, that is to say, be not limited to original resistance.
In sum, the square-wave generator that the utility model provides, comprise wien-bridge oscillator 10, comparator 20, multichannel selection resistance 30 and voltage follower 40, the output of described wien-bridge oscillator 10 is connected to the input of described comparator 20, the output of described comparator 20 is connected to the input of described voltage follower 40 through the first resistance R 1, described multichannel selects the output of resistance 30 to be connected between the output of described comparator 20 and the input of described voltage follower 40.The utility model produces sine wave signal by wien-bridge oscillator 10, the sine wave signal that utilizes comparator 20 that wien-bridge oscillator 10 is produced is converted to square wave, then utilize the first resistance R 1 and multichannel to select resistance 30 to form dividing potential drop modulation circuit, automatically to regulate at any time the amplitude of square wave; Finally at output, increase voltage follower 40, to improve the driving force of square-wave generator.
Obviously, those skilled in the art can carry out various changes and modification and not depart from spirit and scope of the present utility model utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model is also intended to comprise these change and modification.
Claims (5)
1. a square-wave generator, it is characterized in that, comprise wien-bridge oscillator, comparator, multichannel selection resistance and voltage follower, the output of described wien-bridge oscillator is connected to the input of described comparator, the output of described comparator is connected to the input of described voltage follower through the first resistance, described multichannel selects the output of resistance to be connected between the output of described comparator and the input of described voltage follower.
2. square-wave generator as claimed in claim 1, it is characterized in that, described comparator is selected dual operational amplifier, and the inverting input of described dual operational amplifier is connected to the output of described wien-bridge oscillator, and the in-phase input end of described dual operational amplifier is through the second grounding through resistance.
3. square-wave generator as claimed in claim 1, it is characterized in that, described voltage follower is selected the four-operational amplifier with differential input, the in-phase input end of described four-operational amplifier is connected to the output of described comparator, and the inverting input of described four-operational amplifier is connected to the output of described four-operational amplifier.
4. square-wave generator as claimed in claim 1, is characterized in that, described multichannel selects resistance to select 8 channel selecting resistance, and the gating control end of described 8 channel selecting resistance is controlled by three binary system input pins.
5. square-wave generator as claimed in claim 4, is characterized in that, three binary system input pins in described 8 channel selecting resistance are connected with the output pin of single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420438030.6U CN204031099U (en) | 2014-08-05 | 2014-08-05 | A kind of square-wave generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420438030.6U CN204031099U (en) | 2014-08-05 | 2014-08-05 | A kind of square-wave generator |
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| CN204031099U true CN204031099U (en) | 2014-12-17 |
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| CN201420438030.6U Expired - Fee Related CN204031099U (en) | 2014-08-05 | 2014-08-05 | A kind of square-wave generator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233722A (en) * | 2018-03-23 | 2018-06-29 | 山东恒德智能装备科技有限公司 | A kind of DC-DC DC voltage-stabilizings multiple power supplies output circuit |
| CN113464413A (en) * | 2021-07-14 | 2021-10-01 | 东莞市凯格精机股份有限公司 | Alcohol flow controller |
-
2014
- 2014-08-05 CN CN201420438030.6U patent/CN204031099U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233722A (en) * | 2018-03-23 | 2018-06-29 | 山东恒德智能装备科技有限公司 | A kind of DC-DC DC voltage-stabilizings multiple power supplies output circuit |
| CN108233722B (en) * | 2018-03-23 | 2024-01-16 | 鲁东大学 | DC-DC direct-current voltage-stabilizing multipath power supply output circuit |
| CN113464413A (en) * | 2021-07-14 | 2021-10-01 | 东莞市凯格精机股份有限公司 | Alcohol flow controller |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141217 |
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| CF01 | Termination of patent right due to non-payment of annual fee |