CN110233612A - A kind of single input current mode hysteresis comparator - Google Patents
A kind of single input current mode hysteresis comparator Download PDFInfo
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- CN110233612A CN110233612A CN201910614547.3A CN201910614547A CN110233612A CN 110233612 A CN110233612 A CN 110233612A CN 201910614547 A CN201910614547 A CN 201910614547A CN 110233612 A CN110233612 A CN 110233612A
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- resistance
- npn triode
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- current mode
- single input
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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
- H03K5/2409—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 bipolar transistors
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- Nonlinear Science (AREA)
- Manipulation Of Pulses (AREA)
Abstract
The present invention discloses a kind of single input current mode hysteresis comparator, belongs to Analogical Circuit Technique field.The single input current mode hysteresis comparator includes NPN triode Q1 ~ Q3, resistance R1 ~ R5 and buffer Buffer；Wherein, the collector of NPN triode Q1 is connected by resistance R3 with supply voltage VDD, and emitter meets input signal VIN by resistance R1；The collector of NPN triode Q2 is connected by resistance R4 with supply voltage VDD, and emitter is grounded GND by resistance R2；The collector of NPN triode Q3 is connected by resistance R5 with supply voltage VDD, and emitter connects between the emitter and the resistance R2 of the NPN triode Q2, and base stage connects between the collector and the resistance R4 of the NPN triode Q2；The base stage of the NPN triode Q1 and its collector are shorted；The input terminal of the buffer Buffer is connected between the collector of the NPN triode Q3 and the resistance R5, and output end connects the output end VOUT of comparator.
Description
Technical field
The present invention relates to Analogical Circuit Technique field, in particular to a kind of single input current mode hysteresis comparator.
Background technique
One typical comparator is usually voltage-type comparator, by comparing the voltage value and basis of two input signals
Their relative value generates output signal.Under normal conditions, when two input voltages are equal, output state will switch, and reach
To the effect of comparator.
In order to avoid the uncertainty caused when an input signal is located near or at another input signal, at present
Hysteresis loop usually is introduced in conventional voltage comparator, provides individual jump for positive change and the negative sense variation of input signal
Variable threshold value will not cause false triggering to overturn in this way when the voltage value of two input signals is close because of noise.However this biography
The voltage-type hysteresis comparator of system has its limitation: firstly, the operating rate of voltage-type comparator is slower, transmission delay is longer,
It is unable to satisfy the application of certain high speed situations, and hysteresis loop can further extend transmission time, and brings power consumption and area
Problem；Secondly, there was only single input voltage in some applications, it is unable to satisfy the requirement of double-width grinding.
Therefore, it is necessary to invent a kind of novel comparator with lag function, and overcome traditional double-width grinding electricity
Some defects and limitations of die mould comparator.
Summary of the invention
The purpose of the present invention is to provide a kind of single input current mode hysteresis comparators, to solve traditional double-width grinding electricity
The problem of area of die mould hysteresis comparator is big, speed is slow, power consumption is big and application scenarios limitation.
In order to solve the above technical problems, the present invention provides a kind of single input current mode hysteresis comparator, including NPN triode
Q1~Q3 and resistance R1~R5；Wherein,
The collector of NPN triode Q1 is connected by resistance R3 with supply voltage VDD, and emitter is connect defeated by resistance R1
Enter signal VIN；
The collector of NPN triode Q2 is connected by resistance R4 with supply voltage VDD, and emitter is grounded by resistance R2
GND；
The collector of NPN triode Q3 is connected by resistance R5 with supply voltage VDD, and emitter connects in the NPN tri-
Between the emitter of pole pipe Q2 and the resistance R2, base stage connects the collector and the resistance R4 in the NPN triode Q2
Between；
The base stage of the NPN triode Q1 and its collector are shorted.
Optionally, the single input current mode hysteresis comparator further includes buffer Buffer, the buffer Buffer
Input terminal be connected between the collector of the NPN triode Q3 and the resistance R5, output end connect comparator output
Hold VOUT.
Optionally, the BE junction voltage V of the NPN triode Q1BE1, the NPN triode Q2 BE junction voltage VBE2And institute
State the BE junction voltage V of NPN triode Q3BE3It is equal in the on-state, i.e. VBE=VBE1=VBE2=VBE3。
Optionally, the resistance value of the resistance R2 is greater than the resistance value of the resistance R1.
A kind of single input current mode hysteresis comparator, including NPN triode Q1~Q3, resistance R1 are provided in the present invention
~R5 and buffer Buffer；Wherein, the collector of NPN triode Q1 is connected by resistance R3 with supply voltage VDD, is emitted
Pole meets input signal VIN by resistance R1；The collector of NPN triode Q2 is connected by resistance R4 with supply voltage VDD, is sent out
Emitter-base bandgap grading is grounded GND by resistance R2；The collector of NPN triode Q3 is connected by resistance R5 with supply voltage VDD, emitter
It connects between the emitter and the resistance R2 of the NPN triode Q2, base stage connects the collector in the NPN triode Q2
Between the resistance R4；The base stage of the NPN triode Q1 and its collector are shorted；The input terminal of the buffer Buffer
It is connected between the collector of the NPN triode Q3 and the resistance R5, output end connects the output end VOUT of comparator.
The present invention realizes single input current mode sluggishness ratio by the connection type of current mirror and the resistance of different resistance values
Compared with the function of device, the area and power consumption of circuit are reduced, improves the response speed of circuit, and answering for single input can be suitable for
Use environment.
Detailed description of the invention
Fig. 1 is single input current mode hysteresis comparator structural schematic diagram provided by the invention；
Fig. 2 is single input current mode hysteresis comparator work wave schematic diagram provided by the invention.
Specific embodiment
Below in conjunction with the drawings and specific embodiments to a kind of single input current mode hysteresis comparator proposed by the present invention make into
One step is described in detail.According to following explanation and claims, advantages and features of the invention will be become apparent from.It should be noted that
Attached drawing is all made of very simplified form and using non-accurate ratio, only to convenient, lucidly aid illustration is of the invention
The purpose of embodiment.
Embodiment one
The present invention provides a kind of single input current mode hysteresis comparator, circuit structure is as shown in Figure 1.The single input
Current mode hysteresis comparator includes NPN triode Q1~Q3 and resistance R1~R5；Wherein, the collector of NPN triode Q1 passes through
Resistance R3 is connected with supply voltage VDD, and emitter meets input signal VIN by resistance R1；The collector of NPN triode Q2 is logical
It crosses resistance R4 to be connected with supply voltage VDD, emitter is grounded GND by resistance R2；The collector of NPN triode Q3 passes through electricity
Resistance R5 is connected with supply voltage VDD, and emitter connects between the emitter and the resistance R2 of the NPN triode Q2,
Base stage connects between the collector and the resistance R4 of the NPN triode Q2；The base stage of the NPN triode Q1 and its current collection
It is extremely short to connect.
Specifically, the single input current mode hysteresis comparator further includes buffer Buffer, institute please continue to refer to Fig. 2
The input terminal for stating buffer Buffer is connected between the collector of the NPN triode Q3 and the resistance R5, and output end connects
Meet the output end VOUT of comparator.
In the present embodiment one, the BE junction voltage V of the NPN triode Q1BE1, the NPN triode Q2 BE junction voltage
VBE2With the BE junction voltage V of the NPN triode Q3BE3It is equal in the on-state, i.e. VBE=VBE1=VBE2=VBE3。
The voltage of original hypothesis input signal VIN is zero, and supply voltage VDD is via resistance R3, NPN triode Q1 and resistance
After R1, the NPN triode Q1 branch forms conductive path, since setting resistance R2 value is greater than resistance R1 value, so that tri- pole NPN
Pipe Q2 branch does not have electric current, and supply voltage VDD provides base current, tri- pole NPN to the base stage of NPN triode Q3 by resistance R4
Pipe Q3 is in the conductive state, and the voltage of collector is low level, and it is low level that VOUT is exported after buffer Buffer.With
The voltage of input signal VIN raise, the base potential of NPN triode Q1 and Q2 are also accordingly raised, when being raised to VIH voltage value
When, the NPN triode Q2 branch conducting, the base voltage of NPN triode Q3 is pulled low, and NPN triode Q3 becomes closing shape
State, collector voltage become high level, and it is high level that VOUT overturning is exported after buffer Buffer.Therefore VIH voltage
As rise turn threshold voltage, rising turn threshold voltage VIH may be expressed as:
That is:
The voltage of original hypothesis input signal VIN is VDD, and the NPN triode Q1 branch does not have electric current, supply voltage
VDD provides base current to NPN triode Q2 base stage by resistance R3, and NPN triode Q2 is in the conductive state, collector electricity
Pressure is low level, and NPN triode Q3 is in close state, and collector voltage is high level, defeated after buffer Buffer
VOUT is high level out.As input voltage VIN reduces, the NPN triode Q1 branch generates electric current, base voltage and hair
Emitter voltage declines, and NPN triode Q2 branch current is caused to reduce, the emitter voltage decline of NPN triode Q2, but it collects
Electrode voltage increases.When input signal VIN voltage is reduced to VIL, between the collector and emitter of the NPN triode Q2
NPN triode Q3 is connected in voltage difference, and the collector drop-down of NPN triode Q3 is low level, after buffer Buffer
Exporting VOUT overturning is low level.Therefore VIL voltage is to decline turn threshold voltage, and decline turn threshold voltage VIL can
It indicates are as follows:
That is:
From formula (1) and formula (2) as can be seen that by appropriate adjustment resistance R1, R2, R3 and R4 resistance value, i.e., it is settable on
Rise turn threshold VIH and decline turn threshold VIL.
The present invention realizes single input current mode sluggishness ratio by the connection type of current mirror and the resistance of different resistance values
Compared with the function of device, the area and power consumption of circuit are reduced, improves the response speed of circuit, and answering for single input can be suitable for
Use environment.
In the present invention, the word that the expressions such as " connection ", " connected ", " company ", " connecing " are electrical connected, unless otherwise instructed,
Then indicate direct or indirect electric connection.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (4)
1. a kind of single input current mode hysteresis comparator, which is characterized in that including NPN triode Q1~Q3 and resistance R1~R5；
Wherein,
The collector of NPN triode Q1 is connected by resistance R3 with supply voltage VDD, and emitter connects input letter by resistance R1
Number VIN；
The collector of NPN triode Q2 is connected by resistance R4 with supply voltage VDD, and emitter is grounded GND by resistance R2；
The collector of NPN triode Q3 is connected by resistance R5 with supply voltage VDD, and emitter connects in the NPN triode
Between the emitter of Q2 and the resistance R2, base stage is connect between the collector and the resistance R4 of the NPN triode Q2；
The base stage of the NPN triode Q1 and its collector are shorted.
2. single input current mode hysteresis comparator as described in claim 1, which is characterized in that the single input current mode is sluggish
Comparator further includes buffer Buffer, and the input terminal of the buffer Buffer is connected to the current collection of the NPN triode Q3
Between pole and the resistance R5, output end connects the output end VOUT of comparator.
3. single input current mode hysteresis comparator as described in claim 1, which is characterized in that the BE of the NPN triode Q1
Junction voltage VBE1, the NPN triode Q2 BE junction voltage VBE2With the BE junction voltage V of the NPN triode Q3BE3In conducting shape
It is equal under state, i.e. VBE=VBE1=VBE2=VBE3。
4. single input current mode hysteresis comparator as described in claim 1, which is characterized in that the resistance value of the resistance R2 is greater than
The resistance value of the resistance R1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910614547.3A CN110233612B (en) | 2019-07-09 | 2019-07-09 | Single-input current type hysteresis comparator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910614547.3A CN110233612B (en) | 2019-07-09 | 2019-07-09 | Single-input current type hysteresis comparator |
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| CN110233612A true CN110233612A (en) | 2019-09-13 |
| CN110233612B CN110233612B (en) | 2022-08-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114706442A (en) * | 2022-04-12 | 2022-07-05 | 中国电子科技集团公司第五十八研究所 | Low-power-consumption band-gap reference circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1949668A (en) * | 2006-10-25 | 2007-04-18 | 华中科技大学 | Retarding comparator circuit of single terminal input |
| CN204517773U (en) * | 2015-05-14 | 2015-07-29 | 上海中基国威电子有限公司 | A kind of single ended input hysteresis comparator circuit |
| CN105630054A (en) * | 2014-11-04 | 2016-06-01 | 上海华虹宏力半导体制造有限公司 | Hysteresis voltage comparator |
-
2019
- 2019-07-09 CN CN201910614547.3A patent/CN110233612B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1949668A (en) * | 2006-10-25 | 2007-04-18 | 华中科技大学 | Retarding comparator circuit of single terminal input |
| CN105630054A (en) * | 2014-11-04 | 2016-06-01 | 上海华虹宏力半导体制造有限公司 | Hysteresis voltage comparator |
| CN204517773U (en) * | 2015-05-14 | 2015-07-29 | 上海中基国威电子有限公司 | A kind of single ended input hysteresis comparator circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114706442A (en) * | 2022-04-12 | 2022-07-05 | 中国电子科技集团公司第五十八研究所 | Low-power-consumption band-gap reference circuit |
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| CN110233612B (en) | 2022-08-02 |
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