CN101197563A - Magnetic retardation circuit and its amplifier circuit used for comparer - Google Patents
Magnetic retardation circuit and its amplifier circuit used for comparer Download PDFInfo
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- CN101197563A CN101197563A CN 200610160897 CN200610160897A CN101197563A CN 101197563 A CN101197563 A CN 101197563A CN 200610160897 CN200610160897 CN 200610160897 CN 200610160897 A CN200610160897 A CN 200610160897A CN 101197563 A CN101197563 A CN 101197563A
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Abstract
The invention discloses a hysteresis circuit for a comparator and an amplifier circuit thereof, wherein, the hysteresis circuit comprises a first resistance which is electrically coupled between a first input end and an output end of the comparator; a diode which is electrically coupled with the first resistance; and an operational amplifier which is provided with a first input end, a second input end and an output end, and is electrically coupled between the diode and the output end of the comparator, wherein, a high level or low level voltage signal is received by the first input end of the operational amplifier, and outputted by the output end of the operational amplifier to increase the difference between the input voltage signal of the comparator and a reference voltage signal. The invention arranges the hysteresis circuit on a positive feedback route of the comparator, so that the comparator can resist the interference of noise, and the hysteresis circuit has the characteristic of not affecting a feedback voltage signal, so that the hysteresis range of the comparator can be more accurate.
Description
Technical field
The present invention relates to a kind of hysteresis circuit (hysteresis circuit), particularly relate to a kind of hysteresis circuit and amplifier circuit thereof that is applied to comparator.
Background technology
Cause the output misjudgment phenomenon in order to solve comparator circuit because of noise jamming, the common practice is to utilize the comparator internal circuit to add that positive feedback mechanism makes hysteresis, to reach antimierophonic function, please refer to Fig. 1, conversion of signals schematic diagram for general hysteresis circuit, wherein transverse axis is represented input voltage signal Vin, the longitudinal axis is represented output voltage signal Vout, when output voltage signal Vout is low level voltage Vol, then input voltage signal Vin must rise to and be higher than upper limit thresholding (threshold) magnitude of voltage Vth, and output voltage signal Vout just can be converted to high levle voltage Voh from low level voltage Vol.
When output voltage signal Vout is high levle voltage Voh, then input voltage signal Vin must drop to and is lower than a lower limit threshold voltage Vtl, output voltage signal Vout just can be converted to low level voltage Vol from high levle voltage Voh, so when the input voltage signal Vin of comparator had noise jamming, the hysteresis comparator that produces by hysteresis circuit was not vulnerable to noise jamming and misoperation.
Next, please refer to Fig. 2 A, be general hysteresis circuit schematic diagram, a hysteresis circuit 10 is set on the positive feedback path of comparator 20, so that comparator 20 opposing noise jamming, wherein the reference voltage signal Vref of input comparator 20 is produced by power supply stabilization circuit 30, and hysteresis circuit 10 is made of resistance R 1, though this hysteresis circuit 10 has the low and advantage of simple structure of cost, but because the relation of resistance R 1 is set, make the input voltage signal Vin of comparator 20 be subjected to resistance R 1, the influence of resistance R 2 and resistance R 3, and then the accuracy of reduction comparator 20 magnetic hysteresis scopes.
So produced another kind of hysteresis circuit design, please refer to Fig. 2 B, be another kind of hysteresis circuit schematic diagram, being primarily aimed at hysteresis circuit 11 designs, its hysteresis circuit 11 is made of with diode D resistance R 1, so, though the input voltage signal Vin of comparator 20 can not be subjected to the influence of resistance R 1, but can have the relation of forward pressure drop (forward voltage drop) because of diode D, reduce the accuracy of comparator 20 magnetic hysteresis scopes equally.
Therefore, when comparator adopts general hysteresis circuit to design, can be because of the characteristic of circuit unit in the hysteresis circuit, the magnetic hysteresis scope that produces comparator is affected and coarse problem.
Summary of the invention
Technical problem to be solved by this invention is, a kind of hysteresis circuit and amplifier circuit thereof that is applied to comparator is provided, and allows the thresholding comparative voltage of comparator not be subjected to the influence of hysteresis circuit, so that the magnetic hysteresis scope of comparator is more accurate.
To achieve these goals, the invention discloses a kind of hysteresis circuit that is applied to comparator, this comparator has a first input end, one second input and an output, this first input end receives an input voltage signal, this second input receives a reference voltage signal, this comparator is poor according to this input voltage signal and this reference voltage signal, exports a high levle or a low level voltage signal by this output, includes:
One first resistance is electrically coupled between this first input end and this output of this comparator;
One diode is electrically coupled to this first resistance; And
One operational amplifier, have a first input end, one second input and an output, be electrically coupled between the output of this diode and this comparator, this first input end of this operational amplifier receives this high levle or this low level voltage signal, and export this high levle or this low level voltage signal by this output of this operational amplifier, poor with this input voltage signal of increasing this comparator and this reference voltage signal.
This operational amplifier and this diode constitute a super diode circuit, and the forward pressure drop that makes this diode is near zero.
This diode has an input and an output, and this input of this diode is electrically coupled to this output of this operational amplifier, and the output of this diode is electrically coupled to this second input of this first resistance and this operational amplifier.
When this input voltage signal during greater than this reference voltage signal, this output of this comparator is exported this high levle voltage signal.
When this input voltage signal was lower than this reference voltage signal, this output of this comparator was exported this low level voltage signal.
The invention also discloses a kind of amplifier circuit, include:
One first operational amplifier, have a first input end, one second input and an output, this first input end receives an input voltage signal, this second input receives a reference voltage signal, this first operational amplifier is poor according to this input voltage signal and this reference voltage signal, exports a high levle or a low level voltage signal by this output; And
One hysteresis circuit is electrically coupled between this first input end and this output of this first operational amplifier, and wherein this hysteresis circuit includes:
One first resistance is electrically coupled between this first input end and this output of this first operational amplifier;
One diode is electrically coupled to this first resistance; And
One second operational amplifier, have a first input end, one second input and an output, be electrically coupled between the output of this diode and this first operational amplifier, this first input end of this second operational amplifier receives this high levle or this low level voltage signal, and export this high levle or this low level voltage signal by this output of this second operational amplifier, poor with this input voltage signal of increasing this first operational amplifier and this reference voltage signal.
This second operational amplifier and this diode constitute a super diode circuit, and the forward pressure drop that makes this diode is near zero.
This diode has an input and an output, and this input of this diode is electrically coupled to this output of this second operational amplifier, and the output of this diode is electrically coupled to this second input of this first resistance and this second operational amplifier.
When this input voltage signal during greater than this reference voltage signal, this output of this first operational amplifier is exported this high levle voltage signal.
When this input voltage signal was lower than this reference voltage signal, this output of this first operational amplifier was exported this low level voltage signal.
Hysteresis circuit and the amplifier circuit thereof that is applied to comparator of the present invention, utilize operational amplifier and diode to constitute the characteristic of super diode circuit, make in original hysteresis circuit diode forward pressure drop be almost equal to zero, so, can make the feedback voltage signal of comparator not be subjected to the influence of hysteresis circuit, to promote the magnetic hysteresis range definition of comparator, and with respect to existing hysteresis circuit design, hysteresis circuit structure of the present invention only need be provided with an operational amplifier again and can finish, and has the simple advantage of circuit structure.
Description of drawings
Fig. 1 is the conversion of signals schematic diagram of the hysteresis circuit of prior art;
Fig. 2 A is the hysteresis circuit schematic diagram of prior art;
Fig. 2 B is another hysteresis circuit schematic diagram of prior art;
Fig. 3 is the hysteresis circuit schematic diagram of the embodiment of the invention; And
Fig. 4 is the amplifier circuit schematic diagram of the embodiment of the invention.
Wherein, description of drawings:
10 hysteresis circuits, 11 hysteresis circuits
12 hysteresis circuits, 20 comparators
30 power supply stabilization circuit D diodes
OP operational amplifier OP1 first operational amplifier
The OP2 second operational amplifier R1 first resistance
R2 second resistance R 3 the 3rd resistance
R4 the 4th resistance R 5 the 5th resistance
R6 the 6th resistance Vin input voltage signal
Vout output voltage signal Vol low level voltage
Voh high levle voltage Vref reference voltage signal
Vtl lower limit threshold voltage Vth upper limit threshold voltage
The ZD Zener diode
Embodiment
Please refer to Fig. 3, be the hysteresis circuit schematic diagram of the embodiment of the invention.As shown in Figure 3, hysteresis circuit 12 of the present invention includes first resistance R 1, diode D and operational amplifier OP, below explains with regard to each circuit unit annexation:
First resistance R 1 has first end and second end, and first end of first resistance R 1 is electrically coupled to the next stage circuit, and second end of first resistance R 1 is electrically coupled to the output of diode D.
Diode D has an input (being anode) and an output (being negative terminal), the input of diode D is electrically coupled to the output of operational amplifier OP, and the output of diode D is electrically coupled to second end of first resistance R 1 and second input of operational amplifier OP.
Operational amplifier OP has first input end (being normal phase input end), second input (being inverting input) and output, the first input end of operational amplifier OP is electrically coupled to the upper level circuit, and second input of operational amplifier OP is electrically coupled to the output of diode D, and the output of operational amplifier OP is electrically coupled to the input of diode D.
Next, please refer to Fig. 4, be the amplifier circuit schematic diagram of the embodiment of the invention.As shown in Figure 4, amplifier circuit of the present invention includes the first operational amplifier OP1 and hysteresis circuit 12, below explains with regard to each circuit unit annexation:
The first operational amplifier OP1 has first input end (being normal phase input end), second input (being inverting input) and output, the first input end of the first operational amplifier OP1 is electrically coupled to first end of first resistance R 1, first end of second end of second resistance R 2 and the 3rd resistance R 3, and second input of the first operational amplifier OP1 is electrically coupled to power supply stabilization circuit 30, and receive the reference voltage signal Vref that power supply stabilization circuit 30 is exported, and the output of the first operational amplifier OP1 is electrically coupled to the first input end of the second operational amplifier OP2 and first end of the 4th resistance R 4.
First termination of second resistance R 2 is received an input voltage signal Vin, second end of the 3rd resistance R 3 is electrically coupled to earth terminal, second end of the 4th resistance R 4 provides output voltage signal Vout, the second operational amplifier OP2 has first input end (being normal phase input end), second input (being inverting input) and output, the first input end of the second operational amplifier OP2 is electrically coupled to the output of the first operational amplifier OP1 and first end of the 4th resistance R 4, and second input of the second operational amplifier OP2 is electrically coupled to the output of diode D, and the output of the second operational amplifier OP2 is electrically coupled to the input of diode D, and the output of diode D is electrically coupled to second end of first resistance R 1 and second input of the second operational amplifier OP2.
Power supply stabilization circuit 30 includes Zener diode ZD, the 5th resistance R 5, the 6th resistance R 6 and capacitor C.
At first, first end of capacitor C is electrically coupled to first end of the 5th resistance R 5, and second end of capacitor C is electrically coupled to second end of the 6th resistance R 6, first end of the 5th resistance R 5 is electrically coupled to first end (being negative terminal) of Zener diode ZD, second end of second input of the first operational amplifier OP1 and the 7th resistance R 7, second end of the 5th resistance R 5 is electrically coupled to the 3rd end of Zener diode ZD and first end of the 6th resistance R 6, second end of the 6th resistance R 6 is electrically coupled to second end (being anode) and the earth terminal of Zener diode ZD, wherein capacitor C and the 5th resistance R 5, the 6th resistance R 6 constitutes a loop in parallel, and five resistance R 5, the 6th resistance R 6 constitutes a loop in parallel with Zener diode ZD.
The circuit working principle below is described:
When the first input end of the first operational amplifier OP1 receives input voltage signal Vin, the first operational amplifier OP1 compares input voltage signal Vin and reference voltage signal Vref, in input voltage signal Vin during greater than reference voltage signal Vref, output output high levle voltage signal Voh by the first operational amplifier OP1, and this high levle voltage signal Voh is via the second operational amplifier OP2, after the feedback path that the diode D and first resistance R 1 constitute inputs to the first input end of the first operational amplifier OP1, increase the input voltage signal Vin of the input first operational amplifier OP1 and the difference of reference voltage signal Vref, so, the output of the first operational amplifier OP1 can not be subjected to noise jamming and produce misoperation.
In like manner, in input voltage signal Vin during less than reference voltage signal Vref, then the output of the first operational amplifier OP1 is exported low level voltage signal Vol, and after the feedback path that this low level voltage signal Vol constitutes via the second operational amplifier OP2, diode D and first resistance R 1 inputs to the first input end of the first operational amplifier OP1, increase the input voltage signal Vin of the input first operational amplifier OP1 and the difference of reference voltage signal Vref, so, the output of the first operational amplifier OP1 can not be subjected to noise jamming and produce misoperation.
Wherein second operational amplifier OP2 in the hysteresis circuit 12 and diode constitute a super diode (super diode) circuit, equal zero so the forward drop of diode D is close to, so hysteresis circuit 12 can not influence the feedback voltage signal that inputs to the first operational amplifier OP1.
In sum, hysteresis circuit and the amplifier circuit thereof that is applied to comparator of the present invention, mainly can improve the hysteresis circuit that forms by positive feedback resistance and diode combinations and have the problem that influences the feedback voltage signal, and then make the magnetic hysteresis scope of comparator more accurate.
Though the present invention with aforesaid preferred embodiment openly as above; be not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can doing a little change and modification, therefore scope of patent protection of the present invention must be looked the appended claim person of defining of this specification and is as the criterion.
Claims (10)
1. hysteresis circuit that is applied to comparator, this comparator has a first input end, one second input and an output, this first input end receives an input voltage signal, this second input receives a reference voltage signal, this comparator is poor according to this input voltage signal and this reference voltage signal, export a high levle or a low level voltage signal by this output, it is characterized in that this hysteresis circuit includes:
One first resistance is electrically coupled between this first input end and this output of this comparator;
One diode is electrically coupled to this first resistance; And
One operational amplifier, have a first input end, one second input and an output, be electrically coupled between the output of this diode and this comparator, this first input end of this operational amplifier receives this high levle or this low level voltage signal, and export this high levle or this low level voltage signal by this output of this operational amplifier, poor with this input voltage signal of increasing this comparator and this reference voltage signal.
2. the hysteresis circuit that is applied to comparator as claimed in claim 1 is characterized in that, this operational amplifier and this diode constitute a super diode circuit, and the forward pressure drop that makes this diode is near zero.
3. the hysteresis circuit that is applied to comparator as claimed in claim 1, it is characterized in that, this diode has an input and an output, this input of this diode is electrically coupled to this output of this operational amplifier, and the output of this diode is electrically coupled to this second input of this first resistance and this operational amplifier.
4. the hysteresis circuit that is applied to comparator as claimed in claim 1 is characterized in that, when this input voltage signal during greater than this reference voltage signal, this output of this comparator is exported this high levle voltage signal.
5. the hysteresis circuit that is applied to comparator as claimed in claim 1 is characterized in that, when this input voltage signal was lower than this reference voltage signal, this output of this comparator was exported this low level voltage signal.
6. an amplifier circuit is characterized in that, includes:
One first operational amplifier, have a first input end, one second input and an output, this first input end receives an input voltage signal, this second input receives a reference voltage signal, this first operational amplifier is poor according to this input voltage signal and this reference voltage signal, exports a high levle or a low level voltage signal by this output; And
One hysteresis circuit is electrically coupled between this first input end and this output of this first operational amplifier, and wherein this hysteresis circuit includes:
One first resistance is electrically coupled between this first input end and this output of this first operational amplifier;
One diode is electrically coupled to this first resistance; And
One second operational amplifier, have a first input end, one second input and an output, be electrically coupled between the output of this diode and this first operational amplifier, this first input end of this second operational amplifier receives this high levle or this low level voltage signal, and export this high levle or this low level voltage signal by this output of this second operational amplifier, poor with this input voltage signal of increasing this first operational amplifier and this reference voltage signal.
7. amplifier circuit as claimed in claim 6 is characterized in that, this second operational amplifier and this diode constitute a super diode circuit, and the forward pressure drop that makes this diode is near zero.
8. amplifier circuit as claimed in claim 6, it is characterized in that, this diode has an input and an output, this input of this diode is electrically coupled to this output of this second operational amplifier, and the output of this diode is electrically coupled to this second input of this first resistance and this second operational amplifier.
9. amplifier circuit as claimed in claim 6 is characterized in that, when this input voltage signal during greater than this reference voltage signal, this output of this first operational amplifier is exported this high levle voltage signal.
10. amplifier circuit as claimed in claim 6 is characterized in that, when this input voltage signal was lower than this reference voltage signal, this output of this first operational amplifier was exported this low level voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610160897 CN101197563A (en) | 2006-12-08 | 2006-12-08 | Magnetic retardation circuit and its amplifier circuit used for comparer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610160897 CN101197563A (en) | 2006-12-08 | 2006-12-08 | Magnetic retardation circuit and its amplifier circuit used for comparer |
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| Publication Number | Publication Date |
|---|---|
| CN101197563A true CN101197563A (en) | 2008-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610160897 Pending CN101197563A (en) | 2006-12-08 | 2006-12-08 | Magnetic retardation circuit and its amplifier circuit used for comparer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101197563A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026998A (en) * | 2016-05-06 | 2016-10-12 | 武汉航空仪表有限责任公司 | Hysteresis comparison circuit with backup function |
| CN112311396A (en) * | 2020-10-22 | 2021-02-02 | 西安空间无线电技术研究所 | Successive comparison type analog-to-digital conversion circuit with novel architecture |
| CN113484589A (en) * | 2021-06-30 | 2021-10-08 | 杭州加速科技有限公司 | Power-off detection circuit with hysteresis function and control system |
-
2006
- 2006-12-08 CN CN 200610160897 patent/CN101197563A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026998A (en) * | 2016-05-06 | 2016-10-12 | 武汉航空仪表有限责任公司 | Hysteresis comparison circuit with backup function |
| CN106026998B (en) * | 2016-05-06 | 2018-11-06 | 武汉航空仪表有限责任公司 | A kind of hysteresis comparison circuit with backup functionality |
| CN112311396A (en) * | 2020-10-22 | 2021-02-02 | 西安空间无线电技术研究所 | Successive comparison type analog-to-digital conversion circuit with novel architecture |
| CN112311396B (en) * | 2020-10-22 | 2024-03-15 | 西安空间无线电技术研究所 | Successive comparison type analog-to-digital conversion circuit with new architecture |
| CN113484589A (en) * | 2021-06-30 | 2021-10-08 | 杭州加速科技有限公司 | Power-off detection circuit with hysteresis function and control system |
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Open date: 20080611 |