Comparator

Abstract

An embodiment of the present disclosure provides a comparator, comprising: two first current sources, two second current sources, a first voltage follower circuit, a second voltage follower circuit, a first voltage difference control circuit, and a second voltage difference control circuit, wherein the output of the first voltage follower circuit is connected to the output of the second voltage difference control circuit; and the output of the second voltage follower circuit is connected to the output of the first voltage difference control circuit. The embodiment of the present disclosure utilizes a cross-coupling structure as its core, and determines the comparison result through positive feedback of a DC input voltage. This solves the problem that existing high-voltage comparators require all internal MOS transistors to use high-voltage MOS transistors, which occupies a large chip area, consumes a large amount of static current, and the output voltage is biased toward the high-voltage upper rail or lower rail, making it inconvenient for lower-level circuits to process.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of integrated circuits, and in particular, to a comparator. Background Art

[0002] With the development of semiconductor technology, comparators are widely used in almost all industries. Figure 1 Figure 1 shows a circuit diagram of a commonly used comparator 100. VP and VN represent the comparator's power supply and virtual ground, respectively. (V+) and (V-) represent the positive input voltage and negative input voltage, respectively. When the voltage difference between V+ and V- is high, to prevent transistor burnout, all MOSFETs in the circuit must be high-voltage transistors (with a withstand voltage greater than 5.5V). Furthermore, the circuit structure of existing comparators results in a relatively large output voltage difference, meaning the output voltage tends to be biased toward the high-voltage upper rail (VP) or lower rail (VN).

[0003] From the above analysis, we can see that existing comparators used for high voltage all require internal MOS tubes to use high-voltage MOS tubes, which will result in the problems of occupying a large chip area and consuming a lot of static current. In addition, the output voltage is biased towards the high-voltage upper rail or lower rail, resulting in a large output swing, which is inconvenient for downstream circuits to process. Summary of the Invention

[0004] The embodiments described herein provide a comparator to address the problems of existing comparators for high voltage applications, such as large chip area, high static current consumption, large output swing, and inconvenience in downstream circuit processing.

[0005] According to a first aspect of the present disclosure, a comparator is provided, which includes: two first current sources, two second current sources, a first voltage follower circuit, a second voltage follower circuit, a first voltage difference control circuit, and a second voltage difference control circuit, wherein the first voltage follower circuit is configured to receive a first input voltage and is also used to follow the first input voltage to obtain a first following voltage, the output end of the first voltage follower circuit is connected to the ground end after passing through the first second current source, and the output end of the first voltage follower circuit is also connected to the output end of the second voltage difference control circuit; the second voltage follower circuit is configured to receive a second input voltage and is also used to follow the second input voltage to obtain a second following voltage, The output end of the second voltage follower circuit is connected to the ground end after passing through the second second current source, and the output end of the second voltage follower circuit is also connected to the output end of the first voltage difference control circuit; the first voltage difference control circuit is configured to control the voltage difference between the first follower voltage and the second follower voltage, the first voltage difference control circuit receives the first input voltage through the first first current source, and the first voltage difference control circuit is connected to the first voltage follower circuit; the second voltage difference control circuit is configured to control the voltage difference between the first follower voltage and the second follower voltage, the second voltage difference control circuit receives the second input voltage through the second first current source, and the second voltage difference control circuit is connected to the second voltage follower circuit.

[0006] Optionally, the first voltage follower circuit includes a first high-voltage transistor, the first electrode of the first high-voltage transistor is connected to the input end of the first input voltage; the second electrode of the first high-voltage transistor is the output end of the first voltage follower circuit, outputting a first follower voltage; the control electrode of the first high-voltage transistor is respectively connected to the first electrode of the first low-voltage transistor in the first voltage difference control circuit and the control electrode of the first low-voltage transistor.

[0007] Optionally, the second voltage follower circuit includes a second high-voltage transistor, the first electrode of the second high-voltage transistor is connected to the input end of the second input voltage; the second electrode of the second high-voltage transistor is the output end of the second voltage follower circuit, outputting the second follower voltage; the control electrode of the second high-voltage transistor is respectively connected to the first electrode of the fourth low-voltage transistor in the second voltage difference control circuit and the control electrode of the fourth low-voltage transistor.

[0008] Optionally, the first pressure difference control circuit includes: the first low-voltage transistor and a first pressure difference control module, the first pole of the first low-voltage transistor being the input end of the first pressure difference control circuit, and the second pole of the first low-voltage transistor being connected to the first pressure difference control module; the first pressure difference control module is configured to be composed of n1 low-voltage transistors connected in series, and the output end of the first pressure difference control module serves as the output end of the first pressure difference control circuit, wherein n1 is greater than or equal to 1.

[0009] Optionally, the second pressure difference control circuit includes: the fourth low-voltage transistor and a second pressure difference control module, the second pole of the fourth low-voltage transistor being the input end of the second pressure difference control circuit, and the second pole of the fourth low-voltage transistor being connected to the second pressure difference control module; the second pressure difference control module is configured to be composed of n2 low-voltage transistors in series, and the output end of the second pressure difference control module serves as the output end of the second pressure difference control circuit, wherein n2 is greater than or equal to 1.

[0010] Optionally, the first pressure difference control module includes: a second low-voltage transistor and a third low-voltage transistor, the first pole of the second low-voltage transistor serves as the input end of the first pressure difference control module, and the first pole of the second low-voltage transistor is respectively connected to the second pole of the first low-voltage transistor and the control pole of the second low-voltage transistor; the first pole of the third low-voltage transistor is respectively connected to the second pole of the second low-voltage transistor and the control pole of the third low-voltage transistor, and the second pole of the third low-voltage transistor serves as the output end of the first pressure difference control module and is connected to the second pole of the second high-voltage transistor.

[0011] Optionally, the second voltage difference control module includes: a fifth low-voltage transistor and a sixth low-voltage transistor, the first pole of the fifth low-voltage transistor serving as the input end of the second voltage difference control module, the first pole of the fifth low-voltage transistor being respectively connected to the second pole of the fourth low-voltage transistor and the control pole of the fifth low-voltage transistor; the first pole of the sixth low-voltage transistor being respectively connected to the second pole of the fifth low-voltage transistor and the control pole of the sixth low-voltage transistor, the second pole of the sixth low-voltage transistor serving as the output end of the second voltage difference control module, being connected to the second pole of the first high-voltage transistor.

[0012] Optionally, the first voltage difference control circuit and the second voltage difference control circuit control the difference between the first follower voltage and the second follower voltage by controlling the driving voltage of the low-voltage transistor.

[0013] Optionally, the first high-voltage transistor, the second high-voltage transistor, and the first to sixth low-voltage transistors are all N-type MOS transistors.

[0014] According to a second aspect of the present disclosure, a comparator is provided, which includes: a first high-voltage transistor, a second high-voltage transistor, a first low-voltage transistor, a fourth low-voltage transistor, a first voltage difference control module, a second voltage difference control module, two first current sources, and two second current sources, wherein the first electrode of the first high-voltage transistor is connected to the input end of the first input voltage; the second electrode of the first high-voltage transistor outputs a first follower voltage; the second electrode of the first high-voltage transistor is also connected to the first second current source and then grounded; the control electrode of the first high-voltage transistor is respectively connected to the first electrode of the first low-voltage transistor and the control electrode of the first low-voltage transistor; the first electrode of the second high-voltage transistor is connected to the input end of the second input voltage; the second electrode of the second high-voltage transistor outputs a second follower voltage; the second electrode of the second high-voltage transistor is also connected to the second second current source and then grounded; the control electrode of the second high-voltage transistor The first electrode of the fourth low-voltage transistor and the control electrode of the fourth low-voltage transistor are respectively connected; the first electrode of the first low-voltage transistor is connected to the first first current source and then to the input end of the first input voltage, and the second electrode of the first low-voltage transistor is connected to the first pressure difference control module; the first pressure difference control module is configured to be composed of n1 low-voltage transistors connected in series, and the output end of the first pressure difference control module is connected to the second electrode of the second high-voltage transistor, wherein n1 is greater than or equal to 1; the first electrode of the fourth low-voltage transistor is connected to the second first current source and then to the input end of the second input voltage, and the second electrode of the fourth low-voltage transistor is connected to the second pressure difference control module; the second pressure difference control module is configured to be composed of n2 low-voltage transistors connected in series, and the output end of the second pressure difference control module is connected to the second electrode of the first high-voltage transistor, wherein n2 is greater than or equal to 1.

[0015] The comparator of the embodiment of the present disclosure includes: two first current sources, two second current sources, a first voltage follower circuit, a second voltage follower circuit, a first voltage difference control circuit, and a second voltage difference control circuit, wherein the first voltage follower circuit is configured to receive a first input voltage and is also used to follow the first input voltage to obtain a first follow voltage, the output end of the first voltage follower circuit is connected to the ground end after passing through the first second current source, and the output end of the first voltage follower circuit is also connected to the output end of the second voltage difference control circuit; the second voltage follower circuit is configured to receive a second input voltage and is also used to follow the second input voltage to obtain a second follow voltage, and the second voltage follower circuit The output end of the circuit is connected to the ground end after passing through a second second current source, and the output end of the second voltage follower circuit is also connected to the output end of the first voltage difference control circuit; the first voltage difference control circuit is configured to control the voltage difference between the first follower voltage and the second follower voltage, the first voltage difference control circuit receives the first input voltage through the first first current source, and the first voltage difference control circuit is connected to the first voltage follower circuit; the second voltage difference control circuit is configured to control the voltage difference between the first follower voltage and the second follower voltage, the second voltage difference control circuit receives the second input voltage through the second first current source, and the second voltage difference control circuit is connected to the second voltage follower circuit. The comparator of the disclosed embodiment is based on a cross-coupling structure and determines the comparison result through positive feedback of the DC input voltage. The comparison result can be limited to a smaller range by the first and second voltage difference control circuits. In this way, high-voltage transistors can be eliminated in the first and second voltage difference control circuits. Compared with existing comparators used in high voltage applications, the use of high-voltage transistors is reduced, the chip area occupied, and the consumption of static current are reduced. In addition, because the comparison result is limited to a smaller range, the output swing is smaller, which is convenient for processing by the lower circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. It should be noted that the drawings described below only relate to some embodiments of the present disclosure and are not intended to limit the present disclosure.

[0017] Figure 1 is an exemplary circuit diagram of a conventional comparator;

[0018] Figure 2 is a schematic structural diagram of a comparator according to an embodiment of the present disclosure;

[0019] Figure 3 is an exemplary circuit diagram of a comparator according to an embodiment of the present disclosure.

[0020] Elements in the drawings are schematic and not drawn to scale. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work also fall within the scope of protection of the present disclosure.

[0022] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the specification and the relevant art, and will not be interpreted in an idealized or overly formal manner unless otherwise explicitly defined herein. As used herein, a statement that two or more parts are "connected" or "coupled" together shall mean that the parts are joined together either directly or through one or more intermediate components.

[0023] In all embodiments of the present disclosure, since the source and drain (emitter and collector) of the transistor are symmetrical, and the directions of the conduction current between the source and drain (emitter and collector) of the N-type transistor and the P-type transistor are opposite, in the embodiments of the present disclosure, the controlled middle end of the transistor is referred to as the control electrode, and the remaining two ends of the transistor are referred to as the first electrode and the second electrode, respectively. In addition, terms such as "first" and "second" are only used to distinguish one component (or a part of a component) from another component (or another part of a component).

[0024] To address the problems of existing comparators for high-voltage applications, such as large chip area, high quiescent current consumption, and large output swing, which are inconvenient for downstream circuit processing, this disclosure proposes a new comparator. This comparator, based on a cross-coupling structure, determines the comparison result through positive feedback of the DC input voltage, thereby limiting the comparison result to a smaller range (which is applicable to both high-voltage and low-voltage applications). The following is a detailed description of the comparator disclosed in this disclosure.

[0025] like Figure 2As shown, it is a structural diagram of a comparator 200 according to an embodiment of the present disclosure. The comparator 200 includes: two first current sources I1, two second current sources I2, a first voltage follower circuit 210, a second voltage follower circuit 220, a first voltage difference control circuit 230, and a second voltage difference control circuit 240, wherein the first current source I1 and the second current source I2 provide a static operating point for the entire comparator 200 circuit; the first voltage follower circuit 210 is configured to receive a first input voltage V1, and is also used to follow the first input voltage V1 to obtain a first following voltage V1', the output end of the first voltage follower circuit 210 is connected to the ground end after passing through the first second current source I2, and the output end of the first voltage follower circuit 210 is also connected to the output end of the second voltage difference control circuit 240; the second voltage follower circuit 220 is configured to receive the second input voltage V2, and is also used to Following the second input voltage V2, a second following voltage V2' is obtained. The output end of the second voltage follower circuit 220 is connected to the ground end after passing through the second second current source I2. The output end of the second voltage follower circuit 220 is also connected to the output end of the first voltage difference control circuit 230; the first voltage difference control circuit 230 is configured to control the voltage difference between the first following voltage V1' and the second following voltage V2'. The first voltage difference control circuit 230 receives the first input voltage V1 through the first first current source I1. The first voltage difference control circuit 230 is connected to the first voltage follower circuit 210; the second voltage difference control circuit 240 is configured to control the voltage difference between the first following voltage V1' and the second following voltage V2'. The second voltage difference control circuit 240 receives the second input voltage V2 through the second first current source I1. The second voltage difference control circuit 240 is connected to the second voltage follower circuit 220. Under the action of the comparator 200 in the embodiment of the present disclosure, from the start of power-on, after the first follower voltage V1' rises, the second follower voltage V2' will also rise through the voltage difference control of the second voltage difference control circuit 240. After the second follower voltage V2' rises, the first follower voltage V1' will rise again through the voltage difference control of the first voltage difference control circuit 230, forming a positive feedback.If the first input voltage V1 is less than the second input voltage V2, in the positive feedback process, when the first follower voltage V1' rises to be close to the first input voltage V1, the second follower voltage V2' is close to the second input voltage V2, and the entire circuit is in a stable state; similarly, if the first input voltage V1 is greater than the second input voltage V2, in the positive feedback process, when the second follower voltage V2' rises to be close to the second input voltage V2, the first follower voltage V1' is close to the first input voltage V1, and the entire circuit is in a stable state, and then by comparing the first follower voltage V1' with the second follower voltage V2' The comparison result between the first input voltage V1 and the second input voltage V2 is determined based on the result. The comparison result between the first follower voltage V1' and the second follower voltage V2' is mainly determined by the voltage difference between the first voltage difference control circuit 230 and the second voltage difference control circuit 240. Therefore, a smaller voltage difference can be set. In this way, the comparison result between the first follower voltage V1' and the second follower voltage V2' can be limited to a smaller range, which is convenient for processing by the lower-level circuit. In addition, the smaller voltage difference can use low-voltage MOS transistors, so there is no need to use high-voltage MOS transistors in the entire circuit, thereby reducing the chip area occupied and reducing the consumption of static current.

[0026] Further, if Figure 3 , which is an exemplary circuit diagram of a comparator according to an embodiment of the present disclosure.

[0027] In which, the first voltage follower circuit 210 includes a first high-voltage transistor Mh1, the first electrode of the first high-voltage transistor Mh1 is connected to the input end of the first input voltage V1; the second electrode of the first high-voltage transistor Mh1 is the output end of the first voltage follower circuit 210, outputting the first follower voltage V1'; the control electrode of the first high-voltage transistor Mh1 is respectively connected to the first electrode of the first low-voltage transistor M1 and the control electrode of the first low-voltage transistor M1 in the first voltage difference control circuit 230.

[0028] The second voltage follower circuit 220 includes a second high-voltage transistor Mh2, a first electrode of the second high-voltage transistor Mh2 is connected to the input end of the second input voltage V2; the second electrode of the second high-voltage transistor Mh2 is the output end of the second voltage follower circuit 220, and outputs the second follower voltage V2'; the control electrode of the second high-voltage transistor Mh2 is respectively connected to the first electrode and the control electrode of the fourth low-voltage transistor M4 in the second voltage difference control circuit 240.

[0029] The first pressure difference control circuit 230 includes: a first low-voltage transistor M1 and a first pressure difference control module 231. The first pole of the first low-voltage transistor M1 is the input end of the first pressure difference control circuit 230, and the second pole of the first low-voltage transistor M1 is connected to the first pressure difference control module 231. The first pressure difference control module 231 is configured to be composed of n1 low-voltage transistors in series, and the output end of the first pressure difference control module 231 serves as the output end of the first pressure difference control circuit 230, wherein n1 is greater than or equal to 1, and the value of n1 can be determined according to actual needs.

[0030] The second voltage difference control circuit 240 includes: a fourth low-voltage transistor M4, a second voltage difference control module 241, the second pole of the fourth low-voltage transistor M4 is the input end of the second voltage difference control circuit 240, and the second pole of the fourth low-voltage transistor M4 is connected to the second voltage difference control module 241; the second voltage difference control module 241 is configured to be composed of n2 low-voltage transistors connected in series, and the output end of the second voltage difference control module 241 serves as the output end of the second voltage difference control circuit 240, wherein n2 is greater than or equal to 1, and the value of n2 can be determined according to actual needs.

[0031] Specifically, the first voltage difference control circuit 230 and the second voltage difference control circuit 240 control the difference between the first follower voltage V1 ′ and the second follower voltage V2 ′ by controlling the driving voltage (Vgs) of the low voltage transistor.

[0032] Further, Figure 3 The case shown in FIG is n1=n2=2, specifically as Figure 3 As shown, the first voltage difference control module 231 includes: a second low-voltage transistor M2 and a third low-voltage transistor M3, the first electrode of the second low-voltage transistor M2 serves as the input end of the first voltage difference control module 231, and the first electrode of the second low-voltage transistor M2 is respectively connected to the second electrode of the first low-voltage transistor M1 and the control electrode of the second low-voltage transistor M2; the first electrode of the third low-voltage transistor M3 is respectively connected to the second electrode of the second low-voltage transistor M2 and the control electrode of the third low-voltage transistor M3, and the second electrode of the third low-voltage transistor M3 serves as the output end of the first voltage difference control module 231, and is connected to the second electrode of the second high-voltage transistor Mh2.

[0033] The second voltage difference control module 241 includes: a fifth low-voltage transistor M5 and a sixth low-voltage transistor M6. The first electrode of the fifth low-voltage transistor M5 serves as the input end of the second voltage difference control module 241. The first electrode of the fifth low-voltage transistor M5 is respectively connected to the second electrode of the fourth low-voltage transistor M4 and the control electrode of the fifth low-voltage transistor M5; the first electrode of the sixth low-voltage transistor M6 is respectively connected to the second electrode of the fifth low-voltage transistor M5 and the control electrode of the sixth low-voltage transistor M6. The second electrode of the sixth low-voltage transistor M6 serves as the output end of the second voltage difference control module 241 and is connected to the second electrode of the first high-voltage transistor Mh1. It should be noted that in actual applications, the values ​​of n1 and n2 can also be other values, and specific circuit diagrams are not given here for illustration. In addition, Figure 3 In the embodiment, the first high-voltage transistor Mh1 , the second high-voltage transistor Mh2 , and the first to sixth low-voltage transistors M6 are all N-type MOS transistors.

[0034] The following combination Figure 3 The circuit diagram in the figure illustrates the working principle of the comparator according to the embodiment of the present disclosure:

[0035] Assuming that the Vgs of the first to sixth low-voltage transistors (M1-M6) is 1V, after the circuit is powered on, under the positive feedback of the internal cross-coupling structure, as V1' rises, the gate voltage of Mh2 is raised to V1'+3Vgs=V1'+3V, and V2' is raised to V1'+2Vgs=V1'+2V (here it is assumed that the Vgs of Mh2 is also 1V). In this state, the comparison result (difference) between V1' and V2' is 2V; then the gate voltage of Mh1 continues to rise, V1 ' also continues to be raised, and then the Mh2 gate voltage is raised again, and changes according to this rule. When V1' is raised to close to V1 (Mh1 is turned on) or V2' is raised to close to V2 (Mh2 is turned on), the circuit is in a stable state. When V1' is raised to close to V1, if V2 is much larger than V1 (that is, the difference between V2 and V1 is greater than 2V, where 2V is twice Vgs), then in the stable state, V2' is close to V1'+2V, and the comparison result (difference) between V1' and V2' is 2V. If V2 is greater than V1, but not much greater than it (i.e. the difference between V2 and V1 is less than 2V, where 2V is twice Vgs), since V1' is close to V1, then V1'+2V is close to V1+2V, and V1+2V is greater than V2, so V2' can only be close to V2 at most. The comparison result (difference) between V1' and V2' is the difference between V1 and V2. Similarly, when V2' is raised to close to V2, if V1 is much greater than V2 (i.e. the difference between V1 and V2 is greater than 2V, where 2V is 2 If V1 is greater than V2, but not significantly greater than V1 (i.e., the difference between V1 and V2 is less than 2V, where 2V is twice Vgs), then V2' is close to V2, so V2'+2V is close to V2+2V. Since V2+2V is greater than V1, V1' can only approach V1 at most. Therefore, the difference between V1' and V2' is the difference between V1 and V2. In summary, when V2 is significantly higher than V1, V1'≈V1, and V2'≈V1'+2V. Conversely, when V2 is significantly lower than V1, V2'≈V2 and V1'≈V2'+2V. The output voltage difference is limited to 2V. When V2 is no more than 2V higher than V1, due to the positive feedback effect of the cross-coupling structure, V1' ≈ V1 and V2' ≈ V2, resulting in an output voltage difference of V2 - V1. Conversely, when V1 is no more than 2V higher than V2, the output voltage difference is V1 - V2. Based on the above analysis, the output voltage difference, or the comparison between V1' and V2', can be expressed as: min{2, |V1 - V2|}.

[0036] Based on the analysis of the above principle, if n1=n2=3 and Vgs is also 1V, the output voltage difference will be controlled within 3V. Therefore, the values ​​of n1 and n2 can be adjusted according to the actual output voltage difference requirement, that is, the number of transistors connected in series in the first voltage difference control module 231 and the second voltage difference control module 241 can be adjusted.

[0037] In order to further illustrate the comparator of the embodiment of the present disclosure, the circuit principle of the comparator is further illustrated with reference to a specific example. Assume that V1 = 10V, V2 = 100V, and Vgs = 1V. Under the positive feedback of the cross-coupling structure, after the stable state, V1'≈10V, and V2'≈V1'+2V≈12V, and the corresponding output voltage difference is 2V. It can be seen that in the comparison of high-voltage signals, the comparison result is still limited to a small range, which is convenient for lower-level processing. In addition, for the aforementioned example, when V2'≈12V, the voltage value that Mh2 needs to withstand is 88V, so Mh2 needs to be a high-voltage transistor. Similarly, when the first input voltage is high voltage, Mh1 also needs to be a high-voltage transistor, but the other transistors can be low-voltage transistors. This can reduce the chip area and reduce the static current consumption.

[0038] The descriptions of the same or corresponding module units in various embodiments of the present disclosure can refer to each other.

[0039] In the above description, the well-known structural elements and steps are not described in detail. However, it should be understood by those skilled in the art that the corresponding structural elements and steps can be implemented by various technical means. In addition, in order to form the same structural elements, those skilled in the art can also design methods that are not completely the same as the methods described above. In addition, although each embodiment is described separately above, this does not mean that the measures in each embodiment cannot be advantageously used in combination.

[0040] The embodiments of the present invention are described above, but these embodiments do not describe all details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and modify and use it based on the present invention. The scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

[0041] Unless the context clearly indicates otherwise, as used herein and in the appended claims, the singular includes the plural, and vice versa. Thus, when referring to the singular, the plural of the corresponding term is generally included. Similarly, the words "include" and "comprising" are to be interpreted as inclusive rather than exclusive. Likewise, the terms "include" and "or" should be interpreted as inclusive unless such interpretation is expressly prohibited herein. Where the term "example" is used herein, particularly when it follows a group of terms, the "example" is merely exemplary and illustrative and should not be considered exclusive or comprehensive.

[0042] Further aspects and scope of adaptability become apparent from the description provided herein. It should be understood that various aspects of the present disclosure can be implemented individually or in combination with one or more other aspects. It should also be understood that the description and specific embodiments herein are intended to be illustrative only and are not intended to limit the scope of the present disclosure.

[0043] Several embodiments of the present disclosure have been described in detail above, but it is obvious that those skilled in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the present disclosure. The scope of protection of the present disclosure is defined by the appended claims.

Claims

1. A comparator, characterized in that: The comparator includes: two first current sources, two second current sources, a first voltage follower circuit, a second voltage follower circuit, a first voltage difference control circuit, and a second voltage difference control circuit. The first voltage follower circuit is configured to receive a first input voltage and to follow the first input voltage to obtain a first following voltage. The output end of the first voltage follower circuit is connected to the ground end after passing through the first second current source. The output end of the first voltage follower circuit is also connected to the output end of the second voltage difference control circuit. The second voltage follower circuit is configured to receive a second input voltage and to follow the second input voltage to obtain a second following voltage, wherein the output end of the second voltage follower circuit is connected to the ground end after passing through a second second current source, and the output end of the second voltage follower circuit is also connected to the output end of the first voltage difference control circuit; The first voltage difference control circuit is configured to control the voltage difference between the first follower voltage and the second follower voltage, the first voltage difference control circuit receives the first input voltage through a first first current source, and the first voltage difference control circuit is connected to the first voltage follower circuit; The second voltage difference control circuit is configured to control the voltage difference between the first follower voltage and the second follower voltage. The second voltage difference control circuit receives the second input voltage through the second first current source. The second voltage difference control circuit is connected to the second voltage follower circuit.

2. The comparator according to claim 1, wherein: The first voltage follower circuit includes a first high-voltage transistor, the first electrode of the first high-voltage transistor is connected to the input end of the first input voltage; the second electrode of the first high-voltage transistor is the output end of the first voltage follower circuit, outputting a first follower voltage; the control electrode of the first high-voltage transistor is respectively connected to the first electrode of the first low-voltage transistor in the first voltage difference control circuit and the control electrode of the first low-voltage transistor.

3. The comparator according to claim 2, wherein: The second voltage follower circuit includes a second high-voltage transistor, the first electrode of the second high-voltage transistor is connected to the input end of the second input voltage; the second electrode of the second high-voltage transistor is the output end of the second voltage follower circuit, outputting the second follower voltage; the control electrode of the second high-voltage transistor is respectively connected to the first electrode of the fourth low-voltage transistor in the second voltage difference control circuit and the control electrode of the fourth low-voltage transistor.

4. The comparator according to claim 3, wherein: The first voltage difference control circuit includes: the first low voltage transistor, a first voltage difference control module, The first electrode of the first low-voltage transistor is an input end of the first voltage difference control circuit, and the second electrode of the first low-voltage transistor is connected to the first voltage difference control module; The first pressure difference control module is configured to be composed of n1 low-voltage transistors connected in series, and the output end of the first pressure difference control module serves as the output end of the first pressure difference control circuit, wherein n1 is greater than or equal to 1.

5. The comparator according to claim 4, wherein: The second voltage difference control circuit includes: the fourth low voltage transistor, a second voltage difference control module, The second electrode of the fourth low-voltage transistor is an input end of the second voltage difference control circuit, and the second electrode of the fourth low-voltage transistor is connected to the second voltage difference control module; The second voltage difference control module is configured to be composed of n2 low-voltage transistors connected in series, and the output end of the second voltage difference control module serves as the output end of the second voltage difference control circuit, wherein n2 is greater than or equal to 1.

6. The comparator according to claim 5, wherein: The first voltage difference control module includes: a second low voltage transistor and a third low voltage transistor, The first electrode of the second low-voltage transistor serves as an input terminal of the first voltage difference control module, and the first electrode of the second low-voltage transistor is connected to the second electrode of the first low-voltage transistor and the control electrode of the second low-voltage transistor respectively; The first electrode of the third low-voltage transistor is respectively connected to the second electrode of the second low-voltage transistor and the control electrode of the third low-voltage transistor. The second electrode of the third low-voltage transistor serves as the output end of the first voltage difference control module and is connected to the second electrode of the second high-voltage transistor.

7. The comparator according to claim 6, wherein: The second voltage difference control module includes: a fifth low voltage transistor and a sixth low voltage transistor, The first electrode of the fifth low-voltage transistor serves as the input end of the second voltage difference control module, and the first electrode of the fifth low-voltage transistor is respectively connected to the second electrode of the fourth low-voltage transistor and the control electrode of the fifth low-voltage transistor; The first electrode of the sixth low-voltage transistor is respectively connected to the second electrode of the fifth low-voltage transistor and the control electrode of the sixth low-voltage transistor. The second electrode of the sixth low-voltage transistor serves as the output end of the second voltage difference control module and is connected to the second electrode of the first high-voltage transistor.

8. The comparator according to claim 7, wherein: The first voltage difference control circuit and the second voltage difference control circuit control the difference between the first follower voltage and the second follower voltage by controlling the driving voltage of the low voltage transistor.

9. The comparator according to claim 7, wherein: The first high-voltage transistor, the second high-voltage transistor, and the first to sixth low-voltage transistors are all N-type MOS transistors.

10. A comparator, characterized in that: The comparator includes: a first high-voltage transistor, a second high-voltage transistor, a first low-voltage transistor, a fourth low-voltage transistor, a first voltage difference control module, a second voltage difference control module, two first current sources, and two second current sources. Wherein, the first electrode of the first high-voltage transistor is connected to the input end of the first input voltage; the second electrode of the first high-voltage transistor outputs a first follower voltage; the second electrode of the first high-voltage transistor is also connected to the first second current source and then to ground; the control electrode of the first high-voltage transistor is respectively connected to the first electrode of the first low-voltage transistor and the control electrode of the first low-voltage transistor; The first electrode of the second high-voltage transistor is connected to the input terminal of the second input voltage; the second electrode of the second high-voltage transistor outputs a second follower voltage; the second electrode of the second high-voltage transistor is also connected to the second second current source and then to ground; the control electrode of the second high-voltage transistor is respectively connected to the first electrode of the fourth low-voltage transistor and the control electrode of the fourth low-voltage transistor; The first electrode of the first low-voltage transistor is connected to the first current source and then connected to the input end of the first input voltage, and the second electrode of the first low-voltage transistor is connected to the first voltage difference control module; The first pressure difference control module is configured to be composed of n1 low-voltage transistors connected in series, the output end of the first pressure difference control module is connected to the second electrode of the second high-voltage transistor, wherein n1 is greater than or equal to 1; The first electrode of the fourth low-voltage transistor is connected to the second first current source and then connected to the input end of the second input voltage, and the second electrode of the fourth low-voltage transistor is connected to the second voltage difference control module; The second pressure difference control module is configured to be composed of n2 low-voltage transistors connected in series, and the output end of the second pressure difference control module is connected to the second electrode of the first high-voltage transistor, wherein n2 is greater than or equal to 1.

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