CN108768352A - Comparator - Google Patents
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- CN108768352A CN108768352A CN201810786073.6A CN201810786073A CN108768352A CN 108768352 A CN108768352 A CN 108768352A CN 201810786073 A CN201810786073 A CN 201810786073A CN 108768352 A CN108768352 A CN 108768352A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
- H03K5/2472—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude using field effect transistors
- H03K5/2481—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude using field effect transistors with at least one differential stage
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Abstract
The embodiment of the present application provides a kind of comparator comprising：Amplifier, selecting unit, the first branch, the second branch, amplifier are used to amplify the difference between two voltage, and selecting unit is used for according to amplified voltage difference, and the first branch or the second branch are connected to the output end of comparator by selection；Corresponding first comparison result of the output end output first branch of comparator or corresponding second comparison result of output end output the second branch of comparator；The electric current of the first branch and the electric current of the second branch are determined by reference current source, so that the output current of comparator output terminal is determined by reference current source, so that the electric current of the output end of comparator is the electric current determined by reference current source, two voltages for comparing can be disturbed when the output end overturning for avoiding comparator, and then improve the reliability of comparator output.
Description
Technical field
The invention relates to field of circuit technology more particularly to a kind of comparators.
Background technology
In existing integrated circuit technique, often application comparator closes to compare the size between two voltage
System.To avoid comparator from being occurred accidentally overturning by noise jamming, existing comparator generally has certain sluggish ability and lock
Ability is deposited, to avoid the mistake occurred by noise jamming from overturning by sluggish and latch, improves the reliability of comparator output.
In order to realize that sluggish ability and latch ability, existing comparator generally comprise voltage rating unit and sluggishness portion
Point, when comparing two voltage, the size that voltage rating unit compares two voltage, and output voltage comparison result are first passed through,
Then sluggish part promotes hysteresis to generate further according to the voltage comparison result of output, and latches output result.The electricity of output
There is logic overturning in pressure comparison result, and the output of sluggish part can be caused also to carry out logic overturning, but the logic of sluggish part
Overturning can disturb the voltage for comparing, and influence the size of two voltage differences, to interfere output as a result, reducing comparator
The reliability of output.
Invention content
In view of this, one of the technical issues of the embodiment of the present application is solved is to provide a kind of comparator, to solve
The relatively low problem of the reliability of the output result of comparator in the prior art.
The embodiment of the present application provides a kind of comparator comprising：Amplifier, selecting unit, the first branch, second
Road,
The amplifier is used to amplify the difference between two voltage, and the selecting unit is used for according to amplified voltage difference
The first branch or the second branch are connected to the output end of the comparator by value, selection；
The output end of the comparator exports corresponding first comparison result of the first branch or the comparator
Output end exports corresponding second comparison result of the second branch；
The electric current of the first branch and the electric current of the second branch are determined by reference current source so that the comparison
The output current of device output end is determined by the reference current source.
Optionally, in any embodiment of the application, if the first branch is connected to the output end of the comparator,
Then the output end of the comparator carries out positive feedback by the first feedback branch；
If alternatively, the second branch is connected to the output end of the comparator, the output end of the comparator passes through
Second feedback branch carries out positive feedback.
Optionally, in any embodiment of the application, first feedback branch and second feedback branch
On off operating mode is directly controlled by the selecting unit, so that the overturning of the output result of the comparator is happened at hysteresis effect
After generation, the hysteresis effect is caused by the positive feedback of first feedback branch or second feedback branch.
Optionally, in any embodiment of the application, the amplifier include Differential Input to pipe, the first current source,
Second current source,
The Differential Input is connected to two control poles of pipe, and two input poles are first defeated respectively as the amplifier
Enter end and the second input terminal, output of the Differential Input to the output stage of a transistor in pipe as the amplifier
End；
First current source and second current source respectively connect two output stages of pipe with the Differential Input
It connects, the electric current of first current source and the second current source for reference current source described in mirror image.
Optionally, in any embodiment of the application, the first branch includes the 5th current source, the 5th electric current
Electric current of the source for reference current source described in mirror image, it is described if the first branch is connect with the output end of the comparator
The output current of comparator output terminal is determined according to the electric current of the 5th current source so that the output of the comparator output terminal
Electric current is determined by the reference current source.
Optionally, in any embodiment of the application, the comparator further includes the 6th current source,
One end of 6th current source is connect with the first input end of the comparator, for Differential Input described in mirror image
To the electric current of a transistor in pipe, the other end of the 6th current source is connected by a switch with first current source
It connects；
If the first branch is connect with the output end of the comparator, the 6th current source and described are connected
The switch conduction of one current source so that the 6th current source and the Differential Input are to being mirrored the transistor of electric current in pipe
The electric current for dividing first current source, to carry out positive feedback to the comparator.
Optionally, in any embodiment of the application, the second branch includes the 7th current source, the 7th electric current
Source is used for electric current of the Differential Input described in mirror image to a transistor in pipe,
If the second branch is connect with the output end of the comparator, the electric current of the comparator output terminal is according to institute
The determination of the 7th current source is stated, so that the output current of the comparator output terminal is determined by the reference current source.
Optionally, in any embodiment of the application, the comparator further includes the 8th current source,
One end of 8th current source is connect by a switch with the output stage for the transistor for being mirrored electric current, institute
State the electric current of reference current source described in the 8th current source mirror image；
If the second branch is connect with the output end of the comparator, connects the 8th current source and be mirrored electricity
The switch conduction of the differential input transistor of stream so that the electric current for being mirrored the differential input transistor of electric current increases
Add, to carry out positive feedback to the comparator.
Optionally, in any embodiment of the application, the selecting unit includes that first switch circuit and second open
The on off operating mode of powered-down road, the first switch circuit and the second switch circuit is opposite；
The first branch is connected to the output end of the comparator when first switch circuit turn-on, and described second opens
The second branch is connected to the output end of the comparator when closing circuit turn-on.
Optionally, in any embodiment of the application, the first switch circuit is opened including the first sub switch, the second son
It closing, the second switch circuit includes third sub switch, the 4th sub switch,
The control terminal of first sub switch and the third sub switch is connect with the output end of the amplifier, with logical
Cross the on off operating mode that amplified voltage difference controls first sub switch and the third sub switch；
Second sub switch is arranged in series in the second branch, and the 4th sub switch is arranged in series in described
One road；
If the first sub switch conducting, the shutdown of third sub switch, first sub switch control second son and open
Shutdown, third sub switch control the 4th sub switch conducting, and the first branch is connected to the defeated of the comparator
Outlet；
If the first sub switch shutdown, the conducting of third sub switch, first sub switch control second son and open
Conducting, third sub switch control the 4th sub switch shutdown are closed, the second branch is connected to the defeated of the comparator
Outlet.
Comparator provided by the embodiments of the present application comprising：Amplifier, selecting unit, the first branch, the second branch, institute
It states amplifier and is used for according to amplified voltage difference for amplifying the difference between two voltage, the selecting unit, selection will
The first branch or the second branch are connected to the output end of the comparator；The output end of the comparator exports institute
The output end for stating corresponding first comparison result of the first branch or the comparator exports the second branch corresponding second
Comparison result；The electric current of the first branch and the electric current of the second branch are determined by reference current source so that the ratio
Output current compared with device output end is determined by the reference current source, so that the electric current of the output end of comparator is to pass through
The electric current that reference current source determines, when output end overturning for avoiding comparator, can disturb two voltages for comparing, in turn
Improve the reliability of comparator output.
Description of the drawings
Some of detailed description the embodiment of the present application by way of example rather than limitation with reference to the accompanying drawings hereinafter are specific
Embodiment.Identical reference numeral denotes same or similar component or part in attached drawing.Those skilled in the art should manage
Solution, the drawings are not necessarily drawn to scale.In attached drawing：
Fig. 1 is a kind of structural schematic diagram of comparator provided by the embodiments of the present application；
Fig. 2 is a kind of electrical block diagram of comparator provided by the embodiments of the present application；
Fig. 3 is a kind of structural schematic diagram of hysteresis comparator using Schmidt trigger；
Circuit waveform figure when Fig. 4 is the circuit work shown in Fig. 3；
Fig. 5 is a kind of structural schematic diagram of comparator provided by the present application；
Fig. 6 is the circuit waveform figure of circuit at work shown in Fig. 5.
Specific implementation mode
Implementing any technical solution of the embodiment of the present application must be not necessarily required to reach simultaneously above all advantages.
In order to make those skilled in the art more fully understand the technical solution in the embodiment of the present application, below in conjunction with the application
Attached drawing in embodiment, technical solutions in the embodiments of the present application are clearly and completely described, it is clear that described reality
It is the embodiment of the present application a part of the embodiment to apply example only, instead of all the embodiments.Based on the implementation in the embodiment of the present application
Example, the every other embodiment that those of ordinary skill in the art are obtained should all belong to the range of the embodiment of the present application protection.
Further illustrate that the embodiment of the present application implements with reference to the embodiment of the present application attached drawing.
Fig. 1 is a kind of structural schematic diagram of comparator provided by the embodiments of the present application, as shown in Figure 1 comprising：Amplifier
11, selecting unit 12, the first branch 13, the second branch 14.
In the present embodiment, the amplifier 11 is used to amplify the difference between two voltage, as shown in Figure 1, two voltages point
It Wei not VIN1, VIN2.
The selecting unit 12 is used for according to amplified voltage difference, and selection is by the first branch 13 or described the
Two branches 14 are connected to the output end of the comparator.
Specifically, work as VIN1>When VIN2, selecting unit 12 can select the output that the first branch 13 is connected to comparator
VIN1 is worked as at end<When VIN2, selecting unit 12 can select the output end that the second branch 14 is connected to comparator.
The output end of the comparator exports 13 corresponding first comparison result of the first branch or the comparator
Output end export 14 corresponding second comparison result of the second branch.
In the present embodiment, as shown in Figure 1, in actual use, one end of the first branch 13 can be with the output of comparator
End connection, the other end connect with first voltage V1, and first voltage V1 is specifically as follows VIN1 or VIN2 so that comparator it is defeated
Outlet exports corresponding first comparison result of first voltage；One end of the second branch 14 can be connect with the output end of comparator,
The other end is connect with second voltage V2, and second voltage V2 is specifically as follows such as GND so that the output end output second of comparator
Corresponding second comparison result of voltage.
In the present embodiment, the electric current of the first branch 13 and the electric current of the second branch 14 are true by reference current source
It is fixed so that the output current of the comparator output terminal is determined by the reference current source.Comparator output end it is defeated
When going out voltage and overturning, such as from the first output result switch to the second output result or by the second output result switching
To the first output as a result, the electric current of the output end of comparator is the electric current determined by reference current source, to avoid comparing
Two voltages for comparing can be disturbed when the output end overturning of device, and then improve the reliability of comparator output.
Fig. 2 is a kind of electrical block diagram of comparator provided by the embodiments of the present application, as shown in Figure 2 comprising put
Big device, selecting unit, the first branch, the second branch.
In the present embodiment, amplifier includes Differential Input to pipe MP0, MP3, the first current source MN1, the second current source MN4.
The Differential Input is connected to two control poles (i.e. the grid of MP0, MP3) of pipe MP0, MP3, two input poles
(i.e. the source electrode of MP0, MP3) is respectively as the first input end and the second input terminal of the amplifier, first input end connection
First input voltage VIN 1, the second input terminal connect the second input voltage VIN 2, and the Differential Input is to a crystal in pipe
Output end of the output stage (draining) of pipe MP3 as the amplifier, the node of the output end of amplifier is the A in Fig. 2
Point.
The first current source MN1 and the second current source MN4 are respectively with the Differential Input to pipe MP0, MP3
Base described in two output stage (i.e. the drain electrode of MP0, MP3) connections, the first current source MN1 and the second current source MN4 mirror images
The electric current of quasi- current source Ibias.
In the present embodiment, the input terminal of reference current source Ibias is connect with supply voltage VIN0, reference current source Ibias
Output end and the drain electrode of MN0 connect, the drain electrode of the grid of MN0 and MNO connect, the source electrode ground connection of MN0 so that reference current source
The electric current of electric current, that is, MN0 of Ibias.
The grid of the source electrode of first current source MN1 and the second current source MN4 ground connection, grid and MN0 connects so that first
The electric current of reference current source Ibias described in current source MN1 and the second current source MN4 mirror images.
In the present embodiment, the drain electrode of the first current source MN1 connect the drain electrode of the MP0 in pipe with Differential Input, the second electricity
The drain electrode of stream source MN4 connect the drain electrode of the MP3 of pipe with Differential Input, using the current source load as Differential Input to pipe.
In the present embodiment, selecting unit includes first switch circuit and second switch circuit, the first switch circuit
And the on off operating mode of the second switch circuit is opposite；The first branch is connected to institute when the first switch circuit turn-on
State the output end of comparator, when second switch circuit turn-on, the second branch was connected to the output end of the comparator.
Specifically, described as shown in Fig. 2, the first switch circuit includes the first sub switch MP4, the second sub switch MP2
Second switch circuit includes third sub switch MN5, the 4th sub switch MN3.
The control terminal of the first sub switch MP4 and the third sub switch MN5 and the output end of the amplifier connect
It connects, to control the break-make shape of the first sub switch MP4 and the third sub switch MN5 by amplified voltage difference
State.
The second sub switch MP2 is arranged in series in the second branch, and the 4th sub switch MN3 is arranged in series in
In the first branch.
Specifically, the grid of the 4th sub switch MN3 is connect with the grid of the first current source, the source electrode of the 4th sub switch MN3
And both ends of the drain electrode as switch, the 4th sub switch MN3 are arranged in series in the first branch.The grid of second sub switch MP2
The grid of pipe MP0, MP3 are connected to Differential Input, the source electrode of the second sub switch MP2 and the both ends to drain as switch, the
Two sub switch MP2 are arranged in series in the second branch.
If the first sub switch MP4 conductings, the MN5 shutdowns of third sub switch, described in the first sub switch MP4 controls
Second sub switch MP2 shutdowns, third sub switch MN5 control the 4th sub switch MN3 conductings, and the first branch is connected
To the output end of the comparator.
If the first sub switch MP4 shutdowns, the MN5 conductings of third sub switch, described in the first sub switch MP4 controls
Second sub switch MP2 conductings, third sub switch MN5 control the 4th sub switch MN3 shutdowns, and the second branch is connected
To the output end of the comparator.
Specifically, in the present embodiment, as shown in Fig. 2, the first branch includes the 5th current source MN2, the 5th current source
Electric currents of the MN2 for reference current source Ibias described in mirror image, grid and source electrode connection type and the first above-mentioned current source
MN1 is identical, and drain electrode is connected with the source electrode of third switching tube MN5 and the 4th switching tube MN3.
If the first sub switch MP4 conducting, the MN5 shutdowns of third sub switch, the source electrode of the second sub switch MP2 passes through the
One sub switch MP4 is connected to the source electrode of MP0 to be connected to the grid of the second sub switch MP2, leads to the second sub switch MP2 shutdowns, the
Three sub switch MN5, which are turned off, makes the source electrode of the 4th sub switch MN3 connect low-voltage by the 5th current source MN2, and the 4th son is caused to be opened
Close MN3 conductings.
5th current source MN2 is connected to the output by the 4th sub switch MN3 of conducting so that the first branch and comparator
Output end connection, and using the electric current of the 5th current source MN2 as the output current of comparator.
Further, if the first branch is connected to the output end of the comparator, the output end of the comparator
Positive feedback is carried out by the first feedback branch.
Specifically, the comparator further includes the 6th current source MP1, is compared described in one end of the 6th current source MP1
The first input end of device connects, for Differential Input described in mirror image to the electric current of a transistor MP0 in pipe, the 6th electricity
The other end of stream source MP1 is connect by a switch with the first current source MN1, the first sub switch of switch multiplexing MP4 herein.
If the first branch is connect with the output end of the comparator, the 6th current source and described are connected
The switch conduction of one current source, i.e. MP4 are connected so that the 6th current source MP1 divides first electric current with transistor MP0
The electric current of source MN1 so that MN1, MP0, MP1, MP3 form the first feedback branch, to carry out positive feedback to the comparator.
In addition, in the present embodiment, the second branch includes the 7th current source, and the 7th current source is for described in mirror image
Differential Input is to the electric current of a transistor in pipe, and in the present embodiment, the 7th current source is multiplexed above-mentioned 6th current source MP1.
Specifically, the source electrode of the 7th current source MP1 is connect with the first input voltage VIN 1, and grid is with Differential Input in pipe
MP0 grids connection, with mirror image Differential Input to the electric current of the MP0 in pipe.
If the first sub switch MP4 shutdown, the MN5 conductings of third sub switch, the first sub switch control described the
Two sub switch MP2 conductings, third sub switch MN5 control the 4th sub switch MN3 shutdowns, and the second branch is connected to
The output end of the comparator.
If the first sub switch MP4 shutdown, the MN5 conductings of third sub switch, the shutdown of the first sub switch MP4 makes the
The source electrode of two sub switch MP2 connects high voltage by the 7th current source MP1, leads to the second sub switch MP2 conductings, third sub switch
MN5, which is connected, makes the source electrode of the 4th sub switch MN3 connect high voltage, leads to the 4th sub switch MN3 shutdowns.
7th current source MP1 is connected to the output by the second sub switch MP2 of conducting so that the second branch and comparator
Output end connection, and using the electric current of the 7th current source MP1 as the output current of comparator.
Further, if the second branch is connected to the output end of the comparator, the output end of the comparator
Positive feedback is carried out by the second feedback branch.
Specifically, the comparator further includes the 8th current source, and one end of the 8th current source passes through a switch and quilt
The Differential Input of image current connects the output stage of the transistor MP0 in pipe, and the 8th current source is used for mirror image institute
The electric current of reference current source Ibias is stated, the 8th current source herein is multiplexed the 5th current source MN2, switch multiplexing third sub switch
MN5。
If the second branch is connect with the output end of the comparator, the 8th current source MN2 is connected and by mirror
The switch MN5 conductings of the transistor MP0 of image current so that the electric current for being mirrored the transistor MP0 of electric current increases, that is, passes through switch
The electric current of 8th current source MN5 is incorporated into Differential Input in the MP0 in pipe by MN5 so that MN1, MN2, MN5, MP0,
MP3 forms the second feedback branch, to carry out positive feedback to the comparator.
Specifically, the on off operating mode of above-mentioned first feedback branch and second feedback branch directly passes through the selection
Unit controls so that after the positive feedback causes hysteresis effect, the output end of the comparator exports comparison result.
Below by Fig. 2, the circuit operation logic in the embodiment of the present application is specifically described.
Specifically, in the present embodiment, amplifier amplifies first voltage VIN1 and second voltage VIN2 differences and exports, and amplifies
The output point of device is the A points in Fig. 2.
Assuming that in the initial state, the output of A points is low level, then the MP4 pipes in Fig. 2 are open-minded, the shutdown of MN5 pipes, MP2 pipes
Source electrode be connected with grid, MP2 pipes shutdown, the electric current for flowing through MP2 pipes is zero.Electric current Ip1 on MN1 pipes flow to MP4 pipes；MN2
The electric current In2 of pipe drags down the source voltage of MN3 pipes so that MN3 pipes are connected, and the output end of comparator is flow to by MN3 pipes
OUT, and since the source electrode of MN2 pipes is grounded so that the voltage of the output end OUT of comparator is dragged down by the electric current In2 of MN2 pipes, i.e.,
The output end OUT of comparator exports low level.
Under above-mentioned primary condition, if VIN1 is reduced, until the small Δ V1 of voltage of the voltage ratio VIN2 of VIN1 so that A points
Output switching activity be high level so that MP4 pipes shutdown, MN5 pipes conducting.The electric current Ip1 of MP1 flow to ratio by the MP2 pipes of conducting
Compared with the output end OUT of device so that the output end OUT of comparator is drawn high by the electric current Ip1 of MP1 pipes.
Meanwhile MN5 is connected so that the electric current In2 of MN2 is flowed out from MN5 pipes, and flow to MP0 pipes so that the electric current of MP0 pipes
Ip0 increases, and Ip0=In1+In2 is set up.Since the electric current of MP0 pipes increases, and the source voltage of MP0 pipes is constant so that MP0 is managed
Grid voltage reduce.Since the grid of MP3 pipes is connected to the grid of MP0 pipes, then the grid voltage of MP3 pipes equally reduces, MP3
The electric current Ip3 of pipe equally increases, and A point voltages are further pulled up, to realize positive feedback.
Under the conditions of above-mentioned A points voltage is raised, VIN1 is increased, due to the presence of above-mentioned positive feedback so that comparator is deposited
In lag function, i.e., when the voltage of VIN1 rises to Δ V2 bigger than the voltage of VIN2, the caused MP3 of positive feedback can just be overcome to manage
The increased influence of electric current, A points can just overturn as low level.
The overturning of A points is MP4 pipes conducting after low level, the shutdown of MN5 pipes.The conducting of MP4 pipes is so that the electric current Ip1 of MP1 pipes flows
It is managed to MP4, and MN1 pipes is flow to by MP4 pipes.The conducting of MP4 pipes makes MP2 pipes turn off simultaneously, while the shutdown of MN5 pipes, MN3 pipes
Conducting so that the electric current In2 of MN2 pipes is flowed out from MN3 pipes, to provide output current for the output end OUT of comparator.And due to
The source electrode of MN2 pipes is grounded so that the voltage of the output end OUT of comparator is dragged down by the electric current In2 of MN2 pipes, i.e., comparator is defeated
Outlet OUT overturnings are low level.
Due to the presence of positive feedback so that comparator have hysteresis effect, and sluggishness generate after, comparator it is defeated
Outlet OUT's can just overturn as low level so that comparator provided by the present application does not need additional capacitor element or other prolong
When circuit, you can both rotary movements occurs for the output level of the generation action and comparator that ensure hysteresis effect in sequential
Sequencing.
It being managed simultaneously as MP1 is connected to MN1 by MP4 pipes so that MP1 is managed and the electric current of MP0 pipes segmentation MN1 pipes,
Ip0=In1-Ip1 is set up, so that the electric current Ip0 of MP0 pipes reduces.At this point, the electric current due to MP0 pipes reduces, and MP0
Source voltage VIN1 is increased, and MP0 tube grid voltages is caused to increase.Since the grid of MP3 pipes is connected to the grid of MP0 pipes so that
The grid voltage of MP3 pipes increases, since the source voltage VIN2 of MP3 pipes is constant so that the electric current Ip3 of MP3 pipes reduces, A point electricity
Pressure is further dragged down, to realize positive feedback.
In comparator provided in this embodiment, in the case where second voltage VIN2 is constant, the electric current Ip0 of MP0 pipes occurs
Variation so that the comparison threshold value of comparator, which follows, to change, to generate hysteresis effect.And the electric current Ip0 of MP0 pipes becomes
Change, that is, indicates that its corresponding positive feedback process starts, hysteresis effect generates immediately.
In conclusion the hysteresis effect is drawn by the positive feedback of first feedback branch or second feedback branch
It rises, since the on off operating mode of above-mentioned the first feedback branch and the second feedback branch is also directly to be controlled according to selecting unit
So that the overturning of the output result of the comparator is happened at after hysteresis effect generation.Therefore, electricity proposed by the present invention
Road equally ensure that the logic overturning of the output end OUT of comparator will not interfere sluggish generation process, Jin Erzeng in sequential
The reliability for having added comparator to export.
It is further to note that when multiple current source image currents in above-described embodiment, it can be with one to one ratio
Image current, can also be according to other scaled mirror electric currents, and the present embodiment is to this without limiting.And the corresponding embodiments of Fig. 2
In, it is only illustrated by NMOS tube and PMOS tube, under the premise of said program, those skilled in the art can incite somebody to action
NMOS tube, PMOS in Fig. 2 etc. are replaced or by increasing other metal-oxide-semiconductors, are replaced or change, or will be above-mentioned
NMOS tube and PMOS tube replace with other circuit devcies such as BJT pipes；Equally, above-mentioned amplifier etc. is also used only as lifting
Example explanation, amplifier can directly replace with the amplifier of other circuit structures.These modifications or replacements do not make corresponding skill
The essence of art scheme is detached from the spirit and scope of each embodiment technical solution of the application, still falls within the protection domain of the application.
Fig. 3 is a kind of structural schematic diagram of hysteresis comparator using Schmidt trigger, as shown in Figure 3 comprising：It puts
Big device, Schmidt trigger, feedback circuit.
In the present embodiment, amplifier includes two input terminals, and two input terminals input first voltage VIN1 and the respectively
Two voltage VIN2.
In the present embodiment, voltage source VIN3 and MN2 pipe is not a part for hysteresis comparator, and voltage source VIN3 passes through
MN2 pipes connect, and can be corresponding voltage sources when being powered by weak mains to provide first voltage VIN1, VIN3.
Amplifier includes resistance R1, R2, R0, MN0, MN1, MP0, MP1, MP2.
Wherein, the control pole of MP0 is connect with output stage, MP1 be used for mirror image MP0 electric current, MP0 pipe and MP1 pipes it is defeated
Enter pole respectively by resistance R1, R2 and first voltage VIN1 connections, the output stage of MP0 pipes is grounded by resistance R0, MP1 pipes it is defeated
The input pole for going out pole and MN0 connects, and the control pole of the output stage ground connection of MN0, MN0 is connect with input pole.
The control pole of MP2 pipes and the control pole of MP0 connect, and the output stage of MP2 and the input pole of MN1 connect, the control of MN1
The control pole of pole and MN0 connect, the output stage ground connection of MN1.
Output end of the output stage B points of MP2 as amplifier, connect with the input terminal of Schmidt trigger schmitt, applies
Schmitt trigger provides operating current (or providing electric current by second voltage VIN2), and Schmidt by first voltage VIN1
Trigger and amplifier are altogether.
Feedback circuit includes MP3 pipes and R3, R3 and the input pole and the output stage both ends that are connected in MP3 pipes, and R3 and MP3 pipes are whole
Body is serially connected between the input pole of second voltage VIN2 and MP2 pipe.
The output end of Schmidt trigger is connect with the control pole of MP3 pipes, to be controlled by the output of Schmidt trigger
MP3 pipe on off operating modes, and then the electric current of MP2 pipes is influenced, positive feedback is carried out to amplifier.
Circuit waveform figure when Fig. 4 is the circuit work shown in Fig. 3, as shown in figure 4, the voltage as voltage source VIN3 increases
When, first voltage VIN1 increases so that the voltage of the output node B of amplifier reduces, and causes the overturning of Schmidt trigger, applies
Schmitt trigger can extract electric current when overturning from VIN1 so that there are part-times to continue with the increase of VIN3 by VIN1
Increasing, the voltage difference between VIN1 and VIN2 is insufficient to allow the current potential of B points to further decrease, such as shown in the dotted line frame in Fig. 4,
Although the voltage of B points declines, it is not enough to support the overturning of Schmidt trigger, this can lead to the overturning of Schmidt trigger
It pauses, and then leads to the output result mistake of hysteresis comparator.
And it can be with as shown in figure 5, Fig. 5's and Fig. 3 be distinguished as increase voltage source after the comparator in Fig. 3 of application the application
VIN3 and NMOS tube MN6, voltage source VIN3 are connected to comparator input terminal of the present invention by NMOS tube MN6, using as
The power supply source or input signal of first voltage VIN1.
Fig. 6 is the circuit waveform figure of circuit at work shown in Fig. 5, as shown in fig. 6, when VIN3 increases, A nodes
After voltage becomes low level from high level, and MP4 pipes are opened, hysteresis effect starts to generate so that and A point voltages quickly reduce, with
The output level overturning of the output end OUT of comparator afterwards, and the rotary movement additionally will not take out electric current, while the overturning from VIN1
Action is happened at after hysteresis effect generation, will not generate interference to comparison procedure so that the output end OUT overturnings of comparator are just
Often.
Finally it should be noted that：Above example is only to illustrate the technical solution of the embodiment of the present application, rather than limits it
System；Although the application is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its
Still can be with technical scheme described in the above embodiments is modified, or which part technical characteristic is equal
It replaces；And these modifications or replacements, each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution
Spirit and scope.
Claims (10)
1. a kind of comparator, which is characterized in that including：Amplifier, selecting unit, the first branch, the second branch,
The amplifier is used to amplify the difference between two voltage, and the selecting unit is used for according to amplified voltage difference,
The first branch or the second branch are connected to the output end of the comparator by selection；
The output end of the comparator exports the output of corresponding first comparison result of the first branch or the comparator
End exports corresponding second comparison result of the second branch；
The electric current of the first branch and the electric current of the second branch are determined by reference current source so that the comparator is defeated
The output current of outlet is determined by the reference current source.
2. comparator according to claim 1, which is characterized in that if the first branch is connected to the defeated of the comparator
Outlet, then the output end of the comparator pass through the first feedback branch carry out positive feedback；
If alternatively, the second branch is connected to the output end of the comparator, the output end of the comparator passes through second
Feedback branch carries out positive feedback.
3. comparator according to claim 2, which is characterized in that first feedback branch and the second feedback branch
The on off operating mode on road is directly controlled by the selecting unit, so that the overturning of the output result of the comparator is happened at sluggishness
After effect generates, the hysteresis effect is caused by the positive feedback of first feedback branch or second feedback branch.
4. according to claim 1-3 any one of them comparators, which is characterized in that the amplifier includes Differential Input pair
Pipe, the first current source, the second current source,
The Differential Input is connected to two control poles of pipe, first input end of two input poles respectively as the amplifier
And second input terminal, output end of the Differential Input to the output stage of a transistor in pipe as the amplifier；
First current source and second current source respectively connect two output stages of pipe with the Differential Input, institute
State the electric current of the first current source and the second current source for reference current source described in mirror image.
5. comparator according to claim 4, which is characterized in that the first branch includes the 5th current source, and described the
Electric current of five current sources for reference current source described in mirror image, if the first branch is connect with the output end of the comparator,
Then the output current of the comparator output terminal is determined according to the electric current of the 5th current source so that the comparator output terminal
Output current determined by the reference current source.
6. comparator according to claim 5, which is characterized in that the comparator further includes the 6th current source,
One end of 6th current source is connect with the first input end of the comparator, for Differential Input described in mirror image to pipe
In a transistor electric current, the other end of the 6th current source connect by a switch with first current source；
If the first branch is connect with the output end of the comparator, the 6th current source and first electricity are connected
The switch conduction in stream source so that the 6th current source and the Differential Input divide the transistor that electric current is mirrored in pipe
The electric current of first current source, to carry out positive feedback to the comparator.
7. comparator according to claim 4, which is characterized in that the second branch includes the 7th current source, and described the
Seven current sources are used for electric current of the Differential Input described in mirror image to a transistor in pipe,
If the second branch is connect with the output end of the comparator, the electric current of the comparator output terminal is according to described
Seven current sources determine, so that the output current of the comparator output terminal is determined by the reference current source.
8. comparator according to claim 7, which is characterized in that the comparator further includes the 8th current source,
One end of 8th current source is connected by the output stage of a switch and the differential input transistor for being mirrored electric current
It connects, electric current of the 8th current source for reference current source described in mirror image；
If the second branch is connect with the output end of the comparator, connects the 8th current source and be mirrored electric current
The switch conduction of the differential input transistor so that the electric current for being mirrored the differential input transistor of electric current increases, with
Positive feedback is carried out to the comparator.
9. according to claim 1-8 any one of them comparators, which is characterized in that the selecting unit includes first switch electricity
The on off operating mode of road and second switch circuit, the first switch circuit and the second switch circuit is opposite；
The first branch is connected to the output end of the comparator, the second switch electricity when first switch circuit turn-on
The second branch is connected to the output end of the comparator when conducting of road.
10. comparator according to claim 9, which is characterized in that the first switch circuit includes the first sub switch, the
Two sub switchs, the second switch circuit include third sub switch, the 4th sub switch,
The control terminal of first sub switch and the third sub switch is connect with the output end of the amplifier, with by putting
Voltage difference after big controls the on off operating mode of first sub switch and the third sub switch；
Second sub switch is arranged in series in the second branch, and the 4th sub switch is arranged in series in described first
On the road；
If the first sub switch conducting, the shutdown of third sub switch, first sub switch control second sub switch and close
Disconnected, third sub switch controls the 4th sub switch conducting, and the first branch is connected to the output end of the comparator；
If the first sub switch shutdown, the conducting of third sub switch, first sub switch control second sub switch and lead
Logical, third sub switch controls the 4th sub switch shutdown, and the second branch is connected to the output end of the comparator.
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| CN201810786073.6A CN108768352B (en) | 2018-07-17 | 2018-07-17 | Comparator with a comparator circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111865274A (en) * | 2019-04-24 | 2020-10-30 | 雅特力科技(重庆)有限公司 | Comparator circuit |
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| CN108768352B (en) | 2023-11-03 |
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Address after: Room 1201, No.2, Lane 908, Xiuwen Road, Minhang District, Shanghai, 201199 Patentee after: SHANGHAI AWINIC TECHNOLOGY Co.,Ltd. Country or region after: China Address before: Room 303-39, building 33, 680 Guiping Road, Xuhui District, Shanghai 200233 Patentee before: SHANGHAI AWINIC TECHNOLOGY Co.,Ltd. Country or region before: China |