CN209001912U - A kind of square wave generative circuit - Google Patents
A kind of square wave generative circuit Download PDFInfo
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- CN209001912U CN209001912U CN201822105319.7U CN201822105319U CN209001912U CN 209001912 U CN209001912 U CN 209001912U CN 201822105319 U CN201822105319 U CN 201822105319U CN 209001912 U CN209001912 U CN 209001912U
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Abstract
A kind of square wave generative circuit, signal triggering end is connect with the control electrode of the first switch tube, the control electrode of first switch tube also passes through first resistor and connect with power end, the control electrode of first switch tube also passes through first capacitor and connect with square wave output end, second pole of first switch tube is connect with power end, the third pole of first switch tube is grounded by second resistance, and the second capacitor is in parallel with the second resistance；The control electrode of second switch and the third pole of first switch tube connect, second pole of second switch is connect with power end, the third pole of second switch is grounded by a 3rd resistor, third capacitor is in parallel with the 3rd resistor, and the third pole of second switch also passes through the Schmidt trigger and connect with square wave output end.Due to the parameter by adjusting second resistance or the second capacitor, the width of adjustable high level pulse, by adjusting 3rd resistor or the parameter of third capacitor, adjustable low level pulse width has the advantages that flexible in application.
Description
Technical field
This application involves a kind of square wave generative circuits.
Background technique
Existing square wave generative circuit typically cost is higher, and is unable to flexible modulation pulse width.
Summary of the invention
The application provide it is a kind of at low cost, can flexible modulation pulse width square wave generative circuit.
According in a first aspect, provide a kind of square wave generative circuit in a kind of embodiment, including signal triggering end, power end,
Square wave output end, first switch tube, second switch, first capacitor, the second capacitor, third capacitor, periphery resistance and Shi Mi
Special trigger, signal triggering end are connect with the control electrode of the first switch tube, and the control electrode of first switch tube also passes through one
One resistance is connect with power end, and the control electrode of first switch tube also passes through first capacitor and connect with square wave output end, first switch
Second pole of pipe is connect with power end, and the third pole of first switch tube is grounded by a second resistance, the second capacitor and described the
Two resistor coupled in parallel；The control electrode of second switch and the third pole of first switch tube connect, the second pole of second switch and electricity
The third pole of source connection, second switch is grounded by a 3rd resistor, and the third capacitor is in parallel with the 3rd resistor,
The third pole of the second switch also passes through the Schmidt trigger and connect with square wave output end.
Preferably, the first switch tube is PMOS tube, the control of first switch tube extremely grid, the of first switch tube
Two extremely source electrode, the thirds of first switch tube extremely drain；Or first switch tube is PNP triode, the control of first switch tube
Extremely base stage, the extremely emitter of the second of first switch tube, the third of first switch tube extremely collector.
Preferably, the second switch is PMOS tube, the control of second switch extremely grid, the of second switch
Two extremely source electrode, the thirds of second switch extremely drain；Or second switch is PNP triode, the control of second switch
Extremely base stage, the extremely emitter of the second of second switch, the third of second switch extremely collector.
It preferably, further include first diode, the anode of first diode is connect with the control electrode of first switch tube, and first
The cathode of diode is connect with power end.
It preferably, further include the second diode, the anode of the second diode is connected to ground, the cathode of the second diode and
The control electrode of one switching tube connects.
Preferably, the model 74HC14 of the Schmidt trigger.
Preferably, the first switch tube and second switch are the PMOS tube that model is MMSF4205.
Square wave generative circuit according to above-described embodiment can due to the parameter by adjusting second resistance or the second capacitor
To adjust the width of high level pulse, by adjusting 3rd resistor or the parameter of third capacitor, adjustable low level pulse
Width has the advantages that flexible in application.In addition above-described embodiment is made of the common component such as resistance, capacitor, switching tube, so that
Circuit has the advantages that at low cost.
Detailed description of the invention
Fig. 1 is the circuit diagram of one embodiment square wave generative circuit of the application.
Specific embodiment
Below by specific embodiment combination attached drawing, invention is further described in detail.Wherein different embodiments
Middle similar component uses associated similar element numbers.In the following embodiments, many datail descriptions be in order to
The application is better understood.However, those skilled in the art can recognize without lifting an eyebrow, part of feature
It is dispensed, or can be substituted by other elements, material, method in varied situations.In some cases, this Shen
Please it is relevant it is some operation there is no in the description show or describe, this is the core in order to avoid the application by mistake
More descriptions are flooded, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary, they
Relevant operation can be completely understood according to the general technology knowledge of description and this field in specification.
It is herein component institute serialization number itself, such as " first ", " second " etc., is only used for distinguishing described object,
Without any sequence or art-recognized meanings.And " connection ", " connection " described in the application, unless otherwise instructed, include directly and
It is indirectly connected with (connection).
Referring to FIG. 1, square wave generative circuit, including signal triggering end TRI, power end VCC, square wave output end CLK, first
Switching tube M1, second switch M2, first capacitor C1, the second capacitor C2, third capacitor C3, periphery resistance and schmidt trigger
Device U1.
Signal triggering end TRI can be low level pulse for accessing trigger signal and stop signal, trigger signal, stop
Signal can be high level pulse.
Signal triggering end TRI is connect with the grid of first switch tube M1, and the grid of first switch tube M1 also passes through the first electricity
Resistance R1 is connect with power end VCC, and the grid of first switch tube M1 also passes through first capacitor C1 and connect with square wave output end CLK, the
The source electrode of one switching tube M1 is connect with power end VCC, and the drain electrode of first switch tube is grounded by second resistance R2, the second capacitor C2
It is connected in parallel with second resistance R2；The grid of second switch M2 is connect with the drain electrode of first switch tube M1, second switch M2
Source electrode connect with power end VCC, the drain electrode of second switch M2 is grounded by 3rd resistor R3, third capacitor C3 and third electricity
It is in parallel to hinder R2, the drain electrode of second switch M2 also passes through Schmidt trigger U1 and connect with square wave output end CLK.
It further include first diode D1, the anode of first diode D1 is connect with the grid of first switch tube M1, and the one or two
The cathode of pole pipe D1 is connect with power end VCC, and first diode D1 is for preventing during circuit work first switch tube M1's
Grid generates high voltage and burns out first switch tube M1.
It further include the second diode D2, the anode of the second diode D2 is connected to ground, the cathode of the second diode D2 and
The grid of one switching tube M1 connects, and first diode D1 is used to prevent the grid during circuit work in first switch tube M1 from generating
Negative voltage and the conducting for influencing first switch tube M1.
In the present embodiment, the model 74HC14 that Schmidt trigger U1 is used.
In the present embodiment, first switch tube M1 and second switch M2 uses the metal-oxide-semiconductor of model MMSF4205.
Below to the working principle explanation of foregoing circuit.
When signal triggering end TRI receives low level pulse, first switch tube M1 conducting, power end VCC is to the second electricity
Hold C2 to charge rapidly, while second switch M2 ends rapidly, third capacitor C3 is gradually discharged by 3rd resistor R3, in third
The electricity of capacitor C3 storage drops to this period before certain value, and the input terminal 1 of Schmidt trigger U1 is high level, Shi Mi
Then reverse phase is low level to special trigger U1 output end 2, i.e. square wave output end CLK exports low level pulse, and first capacitor C1 is connected,
The grid of first switch tube M1 is low level, and first switch tube M1 conducting makes second switch M2 maintain off state；Thus may be used
See that the capacitance of third capacitor C3 is bigger or the resistance value of 3rd resistor is bigger, then the time for discharging into certain value is more long, that is, maintains
The square wave output end CLK output low level time is more long, so as to be adjusted by adjusting third capacitor C3 or 3rd resistor
Save low level pulse width.
After the electricity of third capacitor C3 storage drops to certain value, the input terminal 1 of Schmidt trigger U1 is low electricity
Flat, then reverse phase is high level to Schmidt trigger U1 output end 2, and the grid of first switch tube M1 is high level, first switch tube
M1 cut-off, the second capacitor C2 are gradually discharged by second resistance R2, the electricity of the second capacitor C2 storage drop to certain value it
Preceding this period, first switch tube M1 maintain off state, and the input terminal 1 of Schmidt trigger U1 is low level, Schmidt
Then reverse phase is high level to trigger U1 output end 2, i.e. square wave output end CLK exports low level pulse；It can be seen that the second capacitor
The capacitance of C2 is bigger or the resistance value of second resistance R2 is bigger, then the time for discharging into certain value is more long, i.e. the output of maintenance square wave
The time that end CLK exports low Gao Ping is more long, so as to by adjusting the second capacitor C2 or the adjustable high level of second resistance
Pulse width.
The second capacitor C2 storage electricity drop to certain value after, second switch M2 grid be low level, second
Switching tube M2 conducting, power end VCC charge rapidly to third capacitor C3 while making the high electricity of the input terminal 1 of Schmidt trigger U1
Flat, the output end 2 of Schmidt trigger U1 is low level, loops back and forth like this generation square wave.
Additionally it should illustrate that the low level pulse width that signal triggering end TRI is received should be greater than square-wave cycle, so that
Circuit has time enough starting of oscillation.
When signal triggering end TRI receives high level pulse, so that first switch tube M1 is maintained off state always, make electricity
Road stops concussion and generates square wave.Here also it should be noted that signal triggering end TRI receives high-level pulse width should also be greater than
Square-wave cycle, so that circuit will not cause circuit starting of oscillation again due to the low level of square wave output end CLK.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (7)
1. a kind of square wave generative circuit, which is characterized in that including signal triggering end, power end, square wave output end, first switch
Pipe, second switch, first capacitor, the second capacitor, third capacitor, periphery resistance and Schmidt trigger, signal triggering end
It being connect with the control electrode of the first switch tube, the control electrode of first switch tube also passes through a first resistor and connect with power end,
The control electrode of first switch tube also passes through first capacitor and connect with square wave output end, and the second pole of first switch tube and power end connect
It connects, the third pole of first switch tube is grounded by a second resistance, and the second capacitor is in parallel with the second resistance；Second switch
Control electrode and the third pole of first switch tube connect, the second pole of second switch connect with power end, second switch
Third pole is grounded by a 3rd resistor, and the third capacitor is in parallel with the 3rd resistor, the third of the second switch
Pole also passes through the Schmidt trigger and connect with square wave output end.
2. square wave generative circuit as described in claim 1, which is characterized in that the first switch tube is PMOS tube, and first opens
The control extremely grid of pipe, the extremely source electrode of the second of first switch tube are closed, the third of first switch tube extremely drains；Or first open
Guan Guanwei PNP triode, the control of first switch tube extremely base stage, the extremely emitter of the second of first switch tube, first switch
The third of pipe extremely collector.
3. square wave generative circuit as described in claim 1, which is characterized in that the second switch is PMOS tube, and second opens
The control extremely grid of pipe, the extremely source electrode of the second of second switch are closed, the third of second switch extremely drains；Or second open
Guan Guanwei PNP triode, the control of second switch extremely base stage, the extremely emitter of the second of second switch, second switch
The third of pipe extremely collector.
4. square wave generative circuit as described in claim 1, which is characterized in that it further include first diode, first diode
Anode is connect with the control electrode of first switch tube, and the cathode of first diode is connect with power end.
5. square wave generative circuit as described in claim 1, which is characterized in that it further include the second diode, the second diode
Anode is connected to ground, and the cathode of the second diode and the control electrode of first switch tube connect.
6. square wave generative circuit as described in claim 1, which is characterized in that the model of the Schmidt trigger
74HC14。
7. square wave generative circuit as described in claim 1, which is characterized in that the first switch tube and second switch are type
It number is the metal-oxide-semiconductor of MMSF4205.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822105319.7U CN209001912U (en) | 2018-12-15 | 2018-12-15 | A kind of square wave generative circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822105319.7U CN209001912U (en) | 2018-12-15 | 2018-12-15 | A kind of square wave generative circuit |
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| Publication Number | Publication Date |
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| CN209001912U true CN209001912U (en) | 2019-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822105319.7U Active CN209001912U (en) | 2018-12-15 | 2018-12-15 | A kind of square wave generative circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111739469A (en) * | 2020-06-28 | 2020-10-02 | 昆山国显光电有限公司 | Display device |
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2018
- 2018-12-15 CN CN201822105319.7U patent/CN209001912U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111739469A (en) * | 2020-06-28 | 2020-10-02 | 昆山国显光电有限公司 | Display device |
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