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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- 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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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 invention relates to the technical field of analog circuits, in particular to a single-input current type hysteresis comparator.
Background
A typical comparator is usually a voltage type comparator that generates an output signal by comparing the voltage values of two input signals and based on their relative values. Normally, when the two input voltages are equal, the output state switches, and the comparator functions.
To avoid the uncertainty caused when one input signal is at or near the other input signal, it is common to introduce hysteresis loops in conventional voltage comparators to provide separate transition thresholds for positive and negative changes in the input signals, so that false triggering flip-flop due to noise does not occur when the voltage values of the two input signals are close to each other. However, the conventional voltage-type hysteresis comparator has limitations: firstly, the voltage type comparator has a slow working rate and a long transmission delay, which cannot meet the application of some high-speed occasions, and the hysteresis loop can further prolong the transmission time and bring the problems of power consumption and area; secondly, in some application occasions, only single input voltage is provided, and the requirement of double-end input cannot be met.
Therefore, there is a need for a novel comparator with hysteresis function, which overcomes some of the drawbacks and limitations of the conventional double-ended input voltage type comparator.
Disclosure of Invention
The invention aims to provide a single-input current type hysteresis comparator to solve the problems of large area, low speed, high power consumption and application scene limitation of the traditional double-end input voltage type hysteresis comparator.
In order to solve the above technical problems, the present invention provides a single input current type hysteresis comparator, which comprises NPN transistors Q1-Q3 and resistors R1-R5; wherein,
a collector of the NPN triode Q1 is connected to the power supply voltage VDD through a resistor R3, and an emitter thereof is connected to the input signal VIN through a resistor R1;
the collector of the NPN triode Q2 is connected with the power supply voltage VDD through a resistor R4, and the emitter of the NPN triode Q2 is grounded GND through a resistor R2;
a collector of the NPN transistor Q3 is connected to the power supply voltage VDD through a resistor R5, an emitter thereof is connected between the emitter of the NPN transistor Q2 and the resistor R2, and a base thereof is connected between the collector of the NPN transistor Q2 and the resistor R4;
the base of the NPN triode Q1 is in short circuit with the collector thereof.
Optionally, the single-input current type hysteresis comparator further includes a Buffer, an input end of the Buffer is connected between a collector of the NPN triode Q3 and the resistor R5, and an output end of the Buffer is connected to an output terminal VOUT of the comparator.
Optionally, the BE junction voltage V of the NPN triode Q1BE1The BE junction voltage V of the NPN triode Q2BE2And the BE junction voltage V of the NPN triode Q3BE3In the on state being equal, i.e. VBE＝VBE1＝VBE2＝VBE3。
Optionally, the resistance value of the resistor R2 is greater than the resistance value of the resistor R1.
The invention provides a single-input current type hysteresis comparator which comprises NPN triodes Q1-Q3, resistors R1-R5 and a Buffer; the collector of the NPN triode Q1 is connected to the power supply voltage VDD through a resistor R3, and the emitter thereof is connected to the input signal VIN through a resistor R1; the collector of the NPN triode Q2 is connected with the power supply voltage VDD through a resistor R4, and the emitter of the NPN triode Q2 is grounded GND through a resistor R2; a collector of the NPN transistor Q3 is connected to the power supply voltage VDD through a resistor R5, an emitter thereof is connected between the emitter of the NPN transistor Q2 and the resistor R2, and a base thereof is connected between the collector of the NPN transistor Q2 and the resistor R4; the base electrode of the NPN triode Q1 is in short circuit with the collector electrode thereof; the input end of the Buffer is connected between the collector of the NPN triode Q3 and the resistor R5, and the output end of the Buffer is connected to the output end VOUT of the comparator.
According to the invention, through the connection mode of the current mirror and the resistors with different resistance values, the function of the single-input current type hysteresis comparator is realized, the area and the power consumption of the circuit are reduced, the response speed of the circuit is improved, and the circuit can be suitable for a single-input application environment.
Drawings
FIG. 1 is a schematic diagram of a single-input current hysteresis comparator according to the present invention;
fig. 2 is a schematic diagram of an operating waveform of the single-input current type hysteresis comparator provided in the present invention.
Detailed Description
The following describes a single-input current type hysteresis comparator in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Example one
The invention provides a single-input current type hysteresis comparator, and the circuit structure of the hysteresis comparator is shown as figure 1. The single-input current type hysteresis comparator comprises NPN triodes Q1-Q3 and resistors R1-R5; the collector of the NPN triode Q1 is connected to the power supply voltage VDD through a resistor R3, and the emitter thereof is connected to the input signal VIN through a resistor R1; the collector of the NPN triode Q2 is connected with the power supply voltage VDD through a resistor R4, and the emitter of the NPN triode Q2 is grounded GND through a resistor R2; a collector of the NPN transistor Q3 is connected to the power supply voltage VDD through a resistor R5, an emitter thereof is connected between the emitter of the NPN transistor Q2 and the resistor R2, and a base thereof is connected between the collector of the NPN transistor Q2 and the resistor R4; the base of the NPN triode Q1 is in short circuit with the collector thereof.
Specifically, referring to fig. 2, the single-input current hysteresis comparator further includes a Buffer, an input terminal of the Buffer is connected between the collector of the NPN transistor Q3 and the resistor R5, and an output terminal of the Buffer is connected to the output terminal VOUT of the comparator.
In the first embodiment, the BE junction voltage V of the NPN transistor Q1BE1The BE junction voltage V of the NPN triode Q2BE2And the BE junction voltage V of the NPN triode Q3BE3In the on state being equal, i.e. VBE＝VBE1＝VBE2＝VBE3。
Initially, it is assumed that the voltage of the input signal VIN is zero, after the power supply voltage VDD passes through the resistor R3, the NPN transistor Q1, and the resistor R1, the branch of the NPN transistor Q1 forms a conductive path, and since the value of the resistor R2 is set to be greater than the value of the resistor R1, the branch of the NPN transistor Q2 is free of current, the power supply voltage VDD provides a base current to the base of the NPN transistor Q3 through the resistor R4, the NPN transistor Q3 is in a conducting state, the voltage of the collector thereof is at a low level, and VOUT is output as a low level after passing through the Buffer. With the voltage rising of the input signal VIN, the base potentials of the NPN triodes Q1 and Q2 are correspondingly raised, when the input signal VIN is raised to the VIH voltage value, the branch of the NPN triode Q2 is turned on, the base voltage of the NPN triode Q3 is pulled low, the NPN triode Q3 becomes a closed state, the collector voltage of the NPN triode Q3 becomes a high level, and the output VOUT is inverted to the high level after passing through the Buffer. The VIH voltage is therefore the rising switching threshold voltage, which can be expressed as:
namely:
initially, it is assumed that the voltage of the input signal VIN is VDD, the branch of the NPN transistor Q1 has no current, the power supply voltage VDD supplies a base current to the base of the NPN transistor Q2 through the resistor R3, the NPN transistor Q2 is in a conducting state, the collector voltage of the NPN transistor Q2 is at a low level, the NPN transistor Q3 is in a closing state, the collector voltage of the NPN transistor Q2 is at a high level, and VOUT is output as a high level after passing through the Buffer. As the input voltage VIN decreases, the NPN transistor Q1 branch generates a current, both its base voltage and emitter voltage decrease, causing the current in the NPN transistor Q2 branch to decrease, the emitter voltage of NPN transistor Q2 to decrease, but its collector voltage to increase. When the voltage of the input signal VIN is reduced to VIL, the voltage difference between the collector and the emitter of the NPN transistor Q2 turns on the NPN transistor Q3, the collector of the NPN transistor Q3 is pulled down to a low level, and the output VOUT is inverted to a low level after passing through the Buffer. The VIL voltage is therefore the falling switching threshold voltage, which can be expressed as:
namely:
as can be seen from the formulas (1) and (2), the rising rollover threshold VIH and the falling rollover threshold VIL can be set by appropriately adjusting the resistances of the resistors R1, R2, R3, and R4.
According to the invention, through the connection mode of the current mirror and the resistors with different resistance values, the function of the single-input current type hysteresis comparator is realized, the area and the power consumption of the circuit are reduced, the response speed of the circuit is improved, and the circuit can be suitable for a single-input application environment.
In the present invention, the terms "connected", "connecting", and the like mean electrically connected, and mean directly or indirectly electrically connected unless otherwise specified.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (4)
1. A single-input current type hysteresis comparator is characterized by comprising NPN triodes Q1-Q3 and resistors R1-R5; wherein,
a collector of the NPN triode Q1 is connected to the power supply voltage VDD through a resistor R3, and an emitter thereof is connected to the input signal VIN through a resistor R1;
the collector of the NPN triode Q2 is connected with the power supply voltage VDD through a resistor R4, and the emitter of the NPN triode Q2 is grounded GND through a resistor R2;
a collector of the NPN transistor Q3 is connected to the power supply voltage VDD through a resistor R5, an emitter thereof is connected between the emitter of the NPN transistor Q2 and the resistor R2, and a base thereof is connected between the collector of the NPN transistor Q2 and the resistor R4;
the base of the NPN triode Q1 is in short circuit with the collector thereof.
2. The single input current mode hysteresis comparator as recited in claim 1, further comprising a Buffer, an input terminal of said Buffer being connected between the collector of said NPN transistor Q3 and said resistor R5, and an output terminal thereof being connected to the output terminal VOUT of the comparator.
3. The single input current-mode hysteretic comparator as claimed in claim 1, wherein BE junction voltage V of said NPN transistor Q1BE1The BE junction voltage V of the NPN triode Q2BE2And the BE junction voltage V of the NPN triode Q3BE3In the on state being equal, i.e. VBE＝VBE1＝VBE2＝VBE3。
4. The single input current mode hysteresis comparator as recited in claim 1, wherein the resistance of the resistor R2 is greater than the resistance of the resistor R1.
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| CN201910614547.3A CN110233612B (en) | 2019-07-09 | 2019-07-09 | Single-input current type hysteresis comparator |
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| 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 |
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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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