CN220457382U - Comparator circuit capable of being used for comparing large input common mode range with negative voltage - Google Patents

Comparator circuit capable of being used for comparing large input common mode range with negative voltage Download PDF

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Publication number
CN220457382U
CN220457382U CN202321782773.0U CN202321782773U CN220457382U CN 220457382 U CN220457382 U CN 220457382U CN 202321782773 U CN202321782773 U CN 202321782773U CN 220457382 U CN220457382 U CN 220457382U
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comparison
loop
detection
switch
module
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王迪
陈琛
方利泉
梁译丹
赖大伟
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Hangzhou Aoxin Technology Co ltd
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Hangzhou Aoxin Technology Co ltd
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Abstract

The comparator circuit capable of being used for comparing the large input common mode range with the negative voltage provided by the utility model has the advantages that the voltage reduction module is adopted in the circuit to reduce the large voltage of the input end, so that the large voltage comparison domain is converted into the small voltage to realize the comparison function, the difficulty of comparing signals in the large voltage domain is reduced, the voltage after the voltage reduction module is adopted to reduce the voltage is reflected to the voltage difference between the corresponding comparison switch grid electrode and the source electrode, so that the comparison module can not only compare the voltage signals in the positive voltage domain, but also compare the voltage signals in the negative voltage domain, and the problem that the negative voltage cannot be normally compared in the prior art is avoided; meanwhile, corresponding current sources and resistors are respectively arranged in a first detection loop and a second detection loop of the detection module, so that the signal overturning threshold value of the comparator circuit which can be used for comparing a large input common mode range with negative pressure is manually controllable, and the current control is realized by adopting the resistors in the comparison module, so that the comparator circuit has practical realizability.

Description

Comparator circuit capable of being used for comparing large input common mode range with negative voltage
Technical Field
The utility model relates to the technical field of electronic chips, in particular to a comparator circuit capable of being used for comparing a large input common mode range with negative voltage.
Background
The comparator is one of the basic blocks in an analog circuit, and is generally used to compare the magnitude of one analog signal with another analog signal (or reference signal), and output voltage information representing the magnitude of the signal. The comparator is an indispensable part of a plurality of analog circuit blocks, and thus it becomes one of the key circuits in the mixed signal processing system. Common comparator types are largely divided into static comparators and dynamic latching comparators. The open loop operational amplifier shown in fig. 1 can be used as a static comparator which is the most basic, the stability problem can not occur in the working process, meanwhile, frequency compensation is not needed, and the response speed is relatively high. Considering the time domain response of a single-stage operational amplifier, the open-loop operational amplifier amplifies small signals faster, and the longer the setup time, the higher the setup accuracy. Further improvement on the basis is that the positive and negative feedback structure is adopted to replace the resistance load as shown in fig. 2, so that the speed of the comparator can be effectively improved. When the comparison result of the output ends Von and Vop is established, the added positive feedback structure can accelerate the comparison speed and reduce the comparison time, and meanwhile, in order to ensure the consistency of the output ends, the transconductance of the MOS tubes at the two sides of the current source is the same, and the relative strength between the transconductance can be realized by changing the width of the MOS tubes. When the comparison switch M4 is stronger than the comparison switch M3, the function of a hysteresis comparator can be realized; when the comparison switch M4 is weaker than the comparison switch M3, gain improvement can be achieved.
The design of the two static comparators is common comparator design circuits at present, the two design modes are that input voltages to be compared are connected into the grid electrode of the MOS tube, the input signals are compared within a certain voltage range in which the MOS tube can normally work, and finally a compared voltage result is output.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a comparator circuit which can be used for comparing a large input common mode range with negative voltage.
In order to achieve the above object, the present utility model provides a comparator circuit usable for comparing a large input common mode range with a negative voltage, comprising: the system comprises a voltage reduction module, a comparison module and a detection module, wherein the comparison module and the detection module further comprise a current compensation module;
the voltage reducing module is connected with the comparison module and the detection module and comprises a first voltage reducing loop and a second voltage reducing loop;
the comparison module comprises a first comparison loop and a second comparison loop which are arranged in a mirror image mode, wherein the first comparison loop comprises a first comparison switch M3, and the second comparison loop comprises a second comparison switch M4. One end of the first comparison loop and one end of the second comparison loop are connected with a positive power supply, the other end of the first comparison loop is connected with the first voltage reduction loop, and the other end of the second comparison loop is connected with the second voltage reduction loop;
the detection module comprises a first detection loop and a second detection loop.
The utility model provides a comparator circuit capable of being used for comparing a large input common mode range with negative voltage, which is characterized by comprising the following components: the system comprises a voltage reduction module, a comparison module and a detection module, wherein the comparison module and the detection module further comprise a current compensation module;
the voltage reducing module is connected with the comparison module and the detection module and comprises a first voltage reducing loop and a second voltage reducing loop;
the comparison module comprises a first comparison loop and a second comparison loop which are arranged in a mirror image mode, wherein the source electrode of the first comparison switch M3 is connected with the source electrode of the second comparison switch M4, the source electrode of the first comparison switch M3 is connected with the first voltage reduction loop, and the source electrode of the second comparison switch M4 is connected with the second voltage reduction loop;
the detection module comprises a first detection loop and a second detection loop.
The utility model provides a comparator circuit capable of being used for comparing a large input common mode range with negative voltage, which is characterized by comprising the following components: the device comprises a voltage reduction module, a comparison module and a detection module, wherein the comparison module further comprises a constant current source module, and the detection module further comprises a current compensation module;
the voltage reducing module is connected with the comparison module and the detection module and comprises a first voltage reducing loop and a second voltage reducing loop;
the comparison module comprises a first comparison loop and a second comparison loop which are arranged in a mirror image mode, the sources of the first comparison switch M3 and the second comparison switch M4 are connected, one end of the first comparison loop and one end of the second comparison loop are connected with a positive power supply, the other end of the first comparison loop is connected with a first voltage reduction loop, and the other end of the second comparison loop is connected with a second voltage reduction loop;
the detection module comprises a first detection loop and a second detection loop.
Preferably, the constant current source module includes:
a first constant current source connected between the first comparison switch M3 and the first step-down loop;
and a second constant current source connected between the second comparison switch M4 and the second step-down loop.
Preferably, the first detection circuit comprises a first detection switch M1, and the second detection circuit comprises a second detection switch M2; the grid electrode of the first detection switch M1 is connected with the drain electrode, the grid electrode of the first detection switch M1 is connected with the grid electrode of the first comparison switch M3, and the source electrode of the first detection switch M1 is connected with the first voltage dropping loop; the grid electrode and the drain electrode of the second detection switch M2 are connected, the grid electrode of the second detection switch M2 is connected with the grid electrode of the second comparison switch M4, the source electrode of the second detection switch M2 is connected with the second voltage dropping loop, and the width-to-length ratio of the first detection switch M1 and the second detection switch M2 is equal.
Preferably, the first detection circuit further comprises: the resistor R1 and the current source I1, the resistor R1 is connected between the source electrode of the first detection switch M1 and the first voltage reduction loop, and the current source I1 is connected between the drain electrode of the first detection switch M1 and the power supply; the second detection loop further comprises: the resistor R4 is connected between the source electrode of the second detection switch M2 and the second voltage reduction loop, and the current source I2 is connected between the drain electrode of the second detection switch M2 and the power supply.
Preferably, the voltage domain of the signal received by the input end of the voltage dropping module is a positive voltage domain or a negative voltage domain.
Preferably, each step-down loop comprises at least two resistors, and the comparison module and the detection module are respectively connected between the two resistors.
Preferably, the first detection circuit further comprises: the resistor R1 and the current source I1, the resistor R1 is connected between the source electrode of the first detection switch M1 and the first voltage reduction loop, and the current source I1 is connected between the drain electrode of the first detection switch M1 and the power supply; the second detection loop further comprises: the resistor R4 is connected between the source electrode of the second detection switch M2 and the second voltage reduction loop, and the current source I2 is connected between the drain electrode of the second detection switch M2 and the power supply; the first comparison loop further includes: a resistor R2 connected between the source of the first comparison switch M3 and the first buck circuit, the second comparison circuit further comprising: and a resistor R3 connected between the source of the second comparison switch M4 and the second buck circuit.
Preferably, the current compensation module includes:
and one end of the first current source is connected with a power supply, and the other end of the first current source is connected between the source electrode of the second detection switch M2 and the R4.
And one end of the second current source is connected with a power supply, and the other end of the second current source is connected between the first voltage dropping loop and the resistor R1.
And one end of the third current source is connected with a power supply, and the other end of the third current source is connected between the source of the second comparison switch M4 and the resistor R3.
And one end of the fourth current source is connected with a power supply, and the other end of the fourth current source is connected between the first voltage dropping loop and the resistor R2.
The beneficial illustration of a comparator circuit that can be used for comparing a large input common mode range with negative voltage provided by the utility model is: the voltage reduction module is adopted in the circuit to reduce the large voltage of the input end, so that the large voltage comparison domain is converted into the small voltage to realize the comparison function, the difficulty of large voltage domain signal comparison is reduced, and the realizability of the circuit is improved. In addition, the voltage of the step-down module is reflected as the voltage difference between the grid electrode and the source electrode of the corresponding comparison switch by adopting the detection module in the circuit, and the comparison module can obtain the comparison result of the input voltage by comparing the current of the corresponding comparison switch; by converting the input comparison voltage signal into the comparison current signal, the comparison module can compare the voltage signal of the positive voltage domain and the voltage signal of the negative voltage domain, so that the problem that the negative voltage cannot be normally compared in the prior art is avoided, and the range of the comparison voltage domain is further widened. Meanwhile, corresponding current sources and resistors are respectively arranged in a first detection loop and a second detection loop of the detection module, so that the signal inversion threshold of the comparator circuit which can be used for comparing the large input common mode range with the negative voltage is manually controllable, and the applicability of the comparator circuit which can be used for comparing the large input common mode range with the negative voltage is enhanced. Furthermore, the current control is realized by adopting the resistor in the comparison module, compared with the control mode of the current source in the prior art, the current control device has practical realizability, ensures that the comparison function of the comparison module has higher stability, and improves the reliability and the stability of function realization of the comparator circuit which can be used for comparing a large input common mode range with negative voltage.
Drawings
FIG. 1 is a first comparator circuit of the prior art;
FIG. 2 is a second comparison circuit of the prior art;
FIG. 3 is a circuit diagram of a first embodiment of a comparator circuit that can be used for comparing a large input common mode range with a negative voltage in accordance with the present utility model;
FIG. 4 is a circuit diagram of a second embodiment of a comparator circuit that can be used for comparing a large input common mode range with a negative voltage in accordance with the present utility model;
fig. 5 is a circuit diagram of a third embodiment of a comparator circuit that can be used for comparing a large input common mode range with a negative voltage.
Detailed Description
The following describes the embodiments of the present utility model in detail with reference to the drawings.
Example 1
As shown in fig. 3, the comparator circuit capable of comparing a large input common mode range with negative voltage provided by the utility model comprises a voltage reduction module 1, a comparison module 2 and a detection module 3, wherein the comparison module 2 and the detection module 3 also comprise a current compensation module. The buck module 1 is connected to the comparing module 2 and the detecting module 3, and the buck module 1 includes a first buck circuit 11 and a second buck circuit 12. The comparison module 2 comprises a first comparison circuit 21 and a second comparison circuit 22 which are arranged in a mirror image manner, wherein the first comparison circuit 21 comprises a first comparison switch M3, and the second comparison circuit 22 comprises a second comparison switch M4; one end of the first comparison circuit 21 and one end of the second comparison circuit 22 are connected with a positive power supply, the other end of the first comparison circuit 21 is connected with the first voltage reduction circuit 11, and the other end of the second comparison circuit 22 is connected with the second voltage reduction circuit 12. The detection module 3 comprises a first detection circuit 31 and a second detection circuit 32, the first detection circuit 31 comprises a first detection switch M1, and the second detection circuit 32 comprises a second detection switch M2; the grid electrode of the first detection switch M1 is connected with the drain electrode, the grid electrode of the first detection switch M1 is connected with the grid electrode of the first comparison switch M3, and the source electrode of the first detection switch M1 is connected with the first voltage dropping loop 11; the gate and drain of the second detection switch M2 are connected, and the gate thereof is connected to the gate of the second comparison switch M4, and the source thereof is connected to the second buck circuit 12.
Specifically, the first buck circuit 11 and the second buck circuit 12 in the buck module 1 each include a plurality of resistors, and are configured to convert a high-voltage signal received at an input end into a small-voltage signal, convert a comparison scene from a large-voltage domain into a small-voltage domain, and perform signal comparison, so that difficulty in voltage comparison under the large-voltage scene is reduced, and feasibility of the circuit is improved. In this embodiment, the voltage domain received by the input end of the voltage reducing module 1 may be a positive voltage domain or a negative voltage domain, the number of resistors in each voltage reducing loop is preferably 2, and the first voltage reducing loop 11 includes a resistor R5 and a resistor R6; the second buck circuit 12 includes a resistor R7 and a resistor R8. When the input end of the first step-down loop 11 receivesInput signal V ip And the input end of the second step-down loop 12 receives the input signal V in After that, the first step-down loop 11 is connected with the resistor R5 and the resistor R6 to the voltage V ip Obtaining the electric signal V after depressurization ip_div The second step-down loop 12 is connected with the resistor R7 and the resistor R8 to the voltage V in Obtaining the electric signal V after depressurization in_div 。
In this embodiment, the first detection circuit 31 further includes a resistor R1 and a current source I1, the resistor R1 is connected between the source of the first detection switch M1 and the first step-down circuit 11, and the current source I1 is connected between the drain of the first detection switch M1 and the power supply; the second detection circuit 32 further includes: the resistor R4 and the current source I2, the resistor R4 is connected between the source of the second detection switch M2 and the second buck circuit 12, and the current source I2 is connected between the drain of the second detection switch M2 and the power supply. The first comparison circuit 21 further includes: the resistor R2 is connected between the source of the first comparison switch M3 and the first buck circuit 11, and the second comparison circuit 22 further includes: and a resistor R3 connected between the source of the second comparison switch M4 and the second buck circuit 12. Wherein the resistances of the resistors R1 to R4 are the same, and the current values of the first current source I1 and the second current source I2 are the same.
After the input signal is reduced in voltage, the first detection circuit 31 outputs an electric signal V through the first detection switch M1 ip_div Reflecting the voltage difference between the gate and the source of the first comparison switch M3 connected thereto to determine the magnitude of the gate voltage of the first comparison switch M3. The second detection circuit 32 outputs the electric signal V through the second detection switch M2 in_div Reflecting the voltage difference between the gate and the source of the second comparison switch M4 connected thereto to determine the magnitude of the gate voltage of the second comparison switch M4. Specifically, as shown in fig. 3, the gate of the first comparison switch M3 is set to point a, the gate of the second comparison switch M4 is set to point b, and the first current source I1 and the second current source I2 provide stable currents I to the first detection circuit 31 and the second detection circuit 32, respectively. At this time, the voltage V at the point a in the module 2 is compared a And voltage V at point b b Then there are:
V b ＝V gs2 +IR2+V in_div
wherein V is gs1 Representing the voltage difference between the gate and the source of the first detection switch M1, V gs2 The voltage difference between the gate and the source of the second detection switch M2 is represented by R1, the resistance in the first detection circuit 31, and R2, the resistance in the second detection circuit 32.
Based on V a And V b When the current flowing through the first detection circuit 31 and the second detection circuit 32 are both I, the width-to-length ratio of the first detection switch M1 and the second detection switch M2 is set to be equal, and V can be obtained gs1 ＝V gs2 At this time, V ip_div And V in_div The relative size of (2) can be reflected in V a And V b On, when V ip_div >V in_div Corresponding to V a >V b Current I of the first comparison loop 21 21 >The current I flowing through the second comparison loop 22 22 The output of the output Von of the first comparison circuit 21 is low and the output of the output Vop of the second comparison circuit 22 is high. When V is ip_div <V in_div When there is V a <V b Current I of the first comparison loop 21 21 < current I flowing through the second comparator circuit 22 22 The output of the output Vop of the second comparison circuit 22 is low and the output of the output Von of the first comparison circuit 21 is high. Wherein the first comparison circuit 21 further comprises a resistor R9 and the second comparison circuit 22 further comprises a resistor R10. According to the utility model, the voltage comparison is realized by reflecting the magnitude of the input voltage as the magnitude of the gate voltage of the corresponding comparison switch through the detection module 3, so that the comparison circuit can realize the comparison in the positive voltage domain and the signal comparison in the negative voltage domain, and the problem that the comparator cannot work normally due to the input negative pressure is avoided.
The current compensation module in this embodiment includes: a first current source DeltaI 1 A second current source DeltaI 2 A third current source DeltaI 3 And a fourth current source DeltaI 4 . A first current source DeltaI 1 One end of which is connected with a power supply and the other end is connected with the firstThe source electrode of the second detection switch M2 is located between the source electrode and the R4. A second current source delta I 2 The other end of which is connected to the power supply and the other end of which is connected between the first step-down loop 11 and the resistor R1. Third current source DeltaI 3 The other end of the second comparison switch M4 is connected between the source of the second comparison switch M4 and the resistor R3. Fourth current source DeltaI 4 The other end of which is connected to the power supply and the other end of which is connected between the first step-down loop 11 and the resistor R2. Wherein the first current source DeltaI 1 A second current source DeltaI 2 A third current source DeltaI 3 And a fourth current source DeltaI 4 Are all current sources with the same current magnitude.
For the signal V obtained after the first step-down loop 11 is step-down ip_div And the signal V obtained after the voltage is reduced by the second voltage reducing loop 12 in_div After a certain fixed difference exists between the two, the output comparison result is turned over, such as V ip_div And V in_div Is 10mV, only when V ip_div And V in_div If the difference between (a) and (b) is greater than 10mV, the output signal will be inverted, otherwise the comparison result will be unchanged, thus introducing a first current source DeltaI into the second detection loop 32 1 The voltage Va 'at the point a and the voltage Vb' at the point b in the comparison module 2 are changed to:
V a '＝V gs1 +IR+V ip_div
V′ b ＝V gs2 +IR+ΔI 1 R+V in_div
the width-length ratio of the first detection switch M1 and the second detection switch M2 is also set to be equal, at this time V ip_div And V in_div +ΔI 1 The relative size of R will be reflected in V a And V b Applying; when V is ip_div >V in_div +ΔI 1 R is V a >V b The opposite is true. At this time, the delta I can be regulated 1 Is to control the magnitude of Δi 1 R, thereby controlling the change in the comparator flip threshold. In addition, in order to let out V ip_div And V in_div No difference in current in the first detection loop 31Setting a second current source delta I 2 The current directly flows out of the connection point of the first buck circuit 11 to compensate the current generated by the first current source delta I 1 The current is introduced.
In this embodiment, the manner of connecting the resistor R2 and the resistor R3 to the source of the corresponding comparison switching tube and the connection point of the corresponding step-down loop after step-down respectively has actual realizability after the current sheet verification, and the comparison function has better stability. Similarly, to eliminate the difference of the voltage difference of the input signal to the currents generated in the first and second comparison circuits 21 and 22, a third current source ΔI is provided in the second comparison circuit 22 3 And a resistor R3 to compensate for the current generated by the first current source DeltaI 1 The voltage difference introduced. Also for maintaining outflow V ip_div And V in_div The first comparison circuit 21 introduces Δi of the same current value 4 Compensating by a third current source DeltaI 3 The current is introduced.
Example two
The principle of the present embodiment is basically the same as that of the first embodiment, except that the source of the first comparison switch M3 is shorted to the source of the second comparison switch M4, the source voltages of the first comparison switch M3 and the second comparison switch M4 are the same, and the comparison module 2 only maintains the fourth current source Δi provided in the first comparison circuit 21 4 Compensating by a first current source DeltaI 1 The introduced voltage difference value can save design cost under the condition that the comparison function of the comparator circuit which can be used for comparing the large input common mode range with the negative voltage is unchanged.
As shown in fig. 4, the comparator circuit capable of comparing a large input common mode range with negative voltage provided by the utility model comprises a voltage reduction module 1, a comparison module 2 and a detection module 3, wherein the comparison module 2 and the detection module 3 also comprise a current compensation module. The buck module 1 is connected to the comparing module 2 and the detecting module 3, and the buck module 1 includes a first buck circuit 11 and a second buck circuit 12. The comparison module 2 comprises a first comparison circuit 21 and a second comparison circuit 22 which are arranged in a mirror image manner, wherein the first comparison circuit 21 comprises a first comparison switch M3, and the second comparison circuit 22 comprises a second comparison switch M4; the source of the first comparison switch M3 is connected to the source of the second comparison switch M4, and the source of the first comparison switch M3 is connected to the first buck circuit 11, and the source of the second comparison switch M4 is connected to the second buck circuit 12. The detection module 3 comprises a first detection circuit 31 and a second detection circuit 32, the first detection circuit 31 comprises a first detection switch M1, and the second detection circuit 32 comprises a second detection switch M2; the grid electrode of the first detection switch M1 is connected with the drain electrode, the grid electrode of the first detection switch M1 is connected with the grid electrode of the first comparison switch M3, and the source electrode of the first detection switch M1 is connected with the first voltage dropping loop 11; the gate and drain of the second detection switch M2 are connected, and the gate thereof is connected to the gate of the second comparison switch M4, and the source thereof is connected to the second buck circuit 12.
Example III
The principle of this embodiment is the same as that of the second embodiment, except that: resistor R2 and fourth current source Δi in the first comparison loop 21 in the first and second embodiments 4 And a resistor R3 and a third current source Δi in the second comparison loop 22 3 Instead of the constant current source module 5, the constant current source module 5 is based on the current source Iss in fig. 1 and is divided into a first constant current source 51 and a second constant current source 52 with the same current value, and the current value of each constant current source is Iss/2. In the working process, the first constant current source 51 and the second constant current source 52 can output stable current signals, wherein the first constant current source 51 is connected between the source of the first comparison switch M3 and the first buck circuit 11, and is used for fixing the current flow direction of the first comparison switch M3 and providing bias for the first comparison circuit 21; the second constant current source 52 is connected between the second comparing switch M4 and the second buck circuit 12, and is used for fixing the current flow direction of the second comparing switch M4 and providing bias for the second comparing circuit 22.
As shown in fig. 5, the comparator circuit capable of comparing a large input common mode range with negative voltage provided by the utility model comprises a voltage reduction module 1, a comparison module 2 and a detection module 3, wherein the comparison module 2 further comprises a constant current source module 5, and the detection module 3 further comprises a current compensation module. The buck module 1 is connected to the comparing module 2 and the detecting module 3, and the buck module 1 includes a first buck circuit 11 and a second buck circuit 12. The comparison module 2 comprises a first comparison loop 21 and a second comparison loop 22 which are arranged in a mirror image manner, the first comparison loop 21 comprises a first comparison switch M3, the second comparison loop 22 comprises a second comparison switch M4, and sources of the first comparison switch M3 and the second comparison switch M4 are connected; one end of the first comparison circuit 21 and one end of the second comparison circuit 22 are connected with a positive power supply, the other end of the first comparison circuit 21 is connected with the first voltage reduction circuit 11, and the other end of the second comparison circuit 22 is connected with the second voltage reduction circuit 12. The detection module 3 comprises a first detection circuit 31 and a second detection circuit 32, the first detection circuit 31 comprises a first detection switch M1, and the second detection circuit 32 comprises a second detection switch M2; the grid electrode of the first detection switch M1 is connected with the drain electrode, the grid electrode of the first detection switch M1 is connected with the grid electrode of the first comparison switch M3, and the source electrode of the first detection switch M1 is connected with the first voltage dropping loop 11; the gate and drain of the second detection switch M2 are connected, and the gate thereof is connected to the gate of the second comparison switch M4, and the source thereof is connected to the second buck circuit 12.
In summary, the comparator circuit capable of comparing the large input common mode range with the negative voltage provided by the utility model adopts the voltage reduction module to reduce the large voltage of the input end in the circuit, so that the large voltage comparison domain is converted into the small voltage to realize the comparison function, the difficulty of comparing signals in the large voltage domain is reduced, and the feasibility of the circuit is improved. In addition, the voltage of the step-down module is reflected as the voltage difference between the grid electrode and the source electrode of the corresponding comparison switch by adopting the detection module in the circuit, and the comparison module can obtain the comparison result of the input voltage by comparing the current of the corresponding comparison switch; by converting the input comparison voltage signal into the comparison current signal, the comparison module can compare the voltage signal of the positive voltage domain and the voltage signal of the negative voltage domain, so that the problem that the negative voltage cannot be normally compared in the prior art is avoided, and the range of the comparison voltage domain is further widened. Meanwhile, corresponding current sources and resistors are respectively arranged in a first detection loop and a second detection loop of the detection module, so that the signal inversion threshold of the comparator circuit which can be used for comparing the large input common mode range with the negative voltage is manually controllable, and the applicability of the comparator circuit which can be used for comparing the large input common mode range with the negative voltage is enhanced. Furthermore, the current control is realized by adopting the resistor in the comparison module, compared with the control mode of the current source in the prior art, the current control device has practical realizability, ensures that the comparison function of the comparison module has higher stability, and improves the reliability and the stability of function realization of the comparator circuit which can be used for comparing a large input common mode range with negative voltage.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the concept of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.

Claims (10)

1. A comparator circuit for comparing a large input common mode range with a negative voltage, comprising: the system comprises a voltage reduction module, a comparison module and a detection module, wherein the comparison module and the detection module further comprise a current compensation module;
the voltage reducing module is connected with the comparison module and the detection module and comprises a first voltage reducing loop and a second voltage reducing loop;
the comparison module comprises a first comparison loop and a second comparison loop which are arranged in a mirror image mode, wherein the first comparison loop comprises a first comparison switch M3, and the second comparison loop comprises a second comparison switch M4; one end of the first comparison loop and one end of the second comparison loop are connected with a positive power supply, the other end of the first comparison loop is connected with the first voltage reduction loop, and the other end of the second comparison loop is connected with the second voltage reduction loop;
the detection module comprises a first detection loop and a second detection loop, wherein the first detection loop comprises a first detection switch M1, and the second detection loop comprises a second detection switch M2; the grid electrode of the first detection switch M1 is connected with the drain electrode, the grid electrode of the first detection switch M1 is connected with the grid electrode of the first comparison switch M3, and the source electrode of the first detection switch M1 is connected with the first voltage dropping loop; the gate and the drain of the second detection switch M2 are connected, the gate thereof is connected to the gate of the second comparison switch M4, and the source thereof is connected to the second buck circuit.
2. A comparator circuit for comparing a large input common mode range with a negative voltage, comprising: the system comprises a voltage reduction module, a comparison module and a detection module, wherein the comparison module and the detection module further comprise a current compensation module;
the voltage reducing module is connected with the comparison module and the detection module and comprises a first voltage reducing loop and a second voltage reducing loop;
the comparison module comprises a first comparison loop and a second comparison loop which are arranged in a mirror image mode, wherein the first comparison loop comprises a first comparison switch M3, and the second comparison loop comprises a second comparison switch M4; the source electrode of the first comparison switch M3 is connected with the source electrode of the second comparison switch M4, the source electrode of the first comparison switch M3 is connected with the first voltage reduction loop, and the source electrode of the second comparison switch M4 is connected with the second voltage reduction loop;
the detection module comprises a first detection loop and a second detection loop, wherein the first detection loop comprises a first detection switch M1, and the second detection loop comprises a second detection switch M2; the grid electrode of the first detection switch M1 is connected with the drain electrode, the grid electrode of the first detection switch M1 is connected with the grid electrode of the first comparison switch M3, and the source electrode of the first detection switch M1 is connected with the first voltage dropping loop; the gate and the drain of the second detection switch M2 are connected, the gate thereof is connected to the gate of the second comparison switch M4, and the source thereof is connected to the second buck circuit.
3. Comparator circuit according to claim 1 or 2, wherein the first detection loop further comprises: the resistor R1 and the current source I1, the resistor R1 is connected between the source electrode of the first detection switch M1 and the first voltage reduction loop, and the current source I1 is connected between the drain electrode of the first detection switch M1 and the power supply; the second detection loop further comprises: the resistor R4 is connected between the source electrode of the second detection switch M2 and the second voltage reduction loop, and the current source I2 is connected between the drain electrode of the second detection switch M2 and the power supply; the first comparison loop further includes: a resistor R2 connected between the source of the first comparison switch M3 and the first buck circuit, the second comparison circuit further comprising: and a resistor R3 connected between the source of the second comparison switch M4 and the second buck circuit.
4. A comparator circuit according to claim 3, wherein the aspect ratio of the first and second detection switches M1, M2 is equal.
5. A comparator circuit for comparing a large input common mode range with a negative voltage, comprising: the device comprises a voltage reduction module, a comparison module and a detection module, wherein the comparison module further comprises a constant current source module, and the detection module further comprises a current compensation module;
the voltage reducing module is connected with the comparison module and the detection module and comprises a first voltage reducing loop and a second voltage reducing loop;
the comparison module comprises a first comparison loop and a second comparison loop which are arranged in a mirror image mode, wherein the first comparison loop comprises a first comparison switch M3, and the second comparison loop comprises a second comparison switch M4; the source electrodes of the first comparison switch M3 and the second comparison switch M4 are connected, one end of the first comparison loop and one end of the second comparison loop are connected with a positive power supply, the other end of the first comparison loop is connected with the first voltage reduction loop, and the other end of the second comparison loop is connected with the second voltage reduction loop;
the detection module comprises a first detection loop and a second detection loop, wherein the first detection loop comprises a first detection switch M1, and the second detection loop comprises a second detection switch M2; the grid electrode of the first detection switch M1 is connected with the drain electrode, the grid electrode of the first detection switch M1 is connected with the grid electrode of the first comparison switch M3, and the source electrode of the first detection switch M1 is connected with the first voltage dropping loop; the gate and the drain of the second detection switch M2 are connected, the gate thereof is connected to the gate of the second comparison switch M4, and the source thereof is connected to the second buck circuit.
6. The comparator circuit of claim 5, wherein the constant current source module comprises:
a first constant current source connected between the first comparison switch M3 and the first step-down loop;
the second constant current source is connected between the second comparison switch M4 and the second voltage reduction loop, the first constant current source is used for fixing the current flow direction of the first comparison switch M3 and providing bias for the first comparison loop, and the second constant current source is used for fixing the current flow direction of the second comparison switch M4 and providing bias for the second comparison loop.
7. The comparator circuit for comparing a large input common mode range with a negative voltage according to claim 5, wherein the first detection loop further comprises: the resistor R1 and the current source I1, the resistor R1 is connected between the source electrode of the first detection switch M1 and the first voltage reduction loop, and the current source I1 is connected between the drain electrode of the first detection switch M1 and the power supply; the second detection loop further comprises: the resistor R4 is connected between the source electrode of the second detection switch M2 and the second voltage reduction loop, and the current source I2 is connected between the drain electrode of the second detection switch M2 and the power supply.
8. The comparator circuit of claim 1, 2 or 5, wherein each buck circuit includes at least two resistors, and the comparing module and the detecting module are respectively connected between the two resistors.
9. The comparator circuit of claim 8, wherein the voltage domain of the signal received at the input of the buck module is either a positive voltage domain or a negative voltage domain.
10. The comparator circuit of claim 1, 2 or 5, wherein the current compensation module comprises:
one end of the first current source is connected with a power supply, and the other end of the first current source is connected between the source electrode of the second detection switch M2 and the R4 and is used for manually regulating and controlling the turnover threshold value of the comparator;
the second current source is connected with the power supply at one end and connected between the first voltage dropping loop and the resistor R1 at the other end, and is used for compensating the current introduced by the first current source;
a third current source, one end of which is connected to the power supply and the other end of which is connected between the source of the second comparison switch M4 and the resistor R3, for compensating the voltage difference introduced by the first current source;
and one end of the fourth current source is connected with the power supply, and the other end of the fourth current source is connected between the first voltage dropping loop and the resistor R2 and is used for compensating the current introduced by the third current source.
CN202321782773.0U 2023-07-08 2023-07-08 Comparator circuit capable of being used for comparing large input common mode range with negative voltage Active CN220457382U (en)

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