Decoupling circuit and power source

Abstract

Disclosed in the present application is a decoupling circuit. The decoupling circuit comprises: at least two decoupling units, which are connected in parallel. Each decoupling unit comprises a first capacitor assembly and a second capacitor assembly, which are connected in parallel, wherein the first capacitor assembly comprises at least two first capacitors, with the withstand voltage of each first capacitor being less than a power source voltage, and the second capacitor assembly comprises a second capacitor. The at least two first capacitors are connected in series, and are then connected in parallel to the second capacitor. In the first capacitor assembly, two adjacent first capacitors are connected to form a common terminal of the decoupling unit, and common terminals of a plurality of decoupling units are connected together.

Description

Decoupling circuit and power supply TECHNICAL FIELD

[0001] The present application relates to the technical field of integrated circuits, in particular to a decoupling circuit and a power supply. BACKGROUND

[0002] With the development of information technology, the requirements for signal acquisition and processing circuits are becoming higher and higher. In order to improve the anti-interference ability of the circuit, the power supply needs to be decoupled. In high-reliability circuits, especially in anti-radiation hardened circuits, the reliability requirements for the decoupling circuit are higher. With the continuous reduction of process size, the problem of device voltage resistance is becoming more and more serious, which leads to the fact that the traditional power supply voltage decoupling method is not applicable under advanced processes, and there are the following two problems: (1) the decoupling capacitor voltage resistance is not enough, and it is easy to be broken down under radiation conditions, resulting in leakage; (2) the leakage will worsen the stability of the power supply voltage, resulting in that the internal circuit cannot work normally.

[0003] SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a decoupling circuit and a power supply for solving at least one problem existing in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the present application provides a decoupling circuit for a power supply, which comprises:

[0006] At least two decoupling units are connected in parallel; each decoupling unit comprises a first capacitor assembly and a second capacitor assembly, and the first capacitor assembly and the second capacitor assembly are connected in parallel;

[0007] The first capacitor assembly comprises at least two first capacitors, and the voltage resistance of each first capacitor is less than the power supply voltage; the second capacitor assembly comprises a second capacitor, and the at least two first capacitors are connected in series and then connected in parallel with the second capacitor;

[0008] In the first capacitor assembly, the adjacent two first capacitors are connected to form the common end of the decoupling unit, and the common ends of the plurality of decoupling units are connected together.

[0009] In an embodiment of the present application, the decoupling unit further comprises:

[0010] A resistance unit, one end of the resistance unit is connected with one end of the first capacitor assembly and one end of the second capacitor assembly respectively, and the other end of the resistance unit is connected with the power supply voltage.

[0011] In an embodiment of the present application, the resistance unit comprises at least one resistance, and when the resistance unit comprises a plurality of resistances, the plurality of resistances are connected in parallel or / and in series.

[0012] In an embodiment of the present application, the first capacitances of the at least two decoupling units are arranged in the same well.

[0013] In an embodiment of the present application, the first capacitances of some of the at least two decoupling units are arranged in the same well.

[0014] In an embodiment of the present application, the first capacitances of each of the at least two decoupling units are arranged in different wells.

[0015] In an embodiment of the present application, in each of the decoupling units, the first capacitance and the second capacitance are arranged in a stacked manner in a layout.

[0016] In an embodiment of the present application, the decoupling circuit further comprises an input port and an output port, the plurality of decoupling units are connected in parallel between the input port and the output port, the input port is connected to a power supply voltage, and the output port is connected to a unit circuit to be powered.

[0017] In an embodiment of the present application, the time constants of each of the decoupling units are the same.

[0018] To achieve the above object and other related objects, the present application provides a power supply comprising the decoupling circuit.

[0019] As described above, the decoupling circuit and the power supply provided by the present application have the following beneficial effects:

[0020] The decoupling circuit provided by the present application comprises at least two decoupling units connected in parallel, each of the decoupling units comprises a first capacitance component and a second capacitance component connected in parallel, the first capacitance component comprises at least two first capacitances each having a voltage resistance less than a power supply voltage, the second capacitance component comprises a second capacitance, the at least two first capacitances are connected in series and then connected in parallel with the second capacitance, in the first capacitance component, two adjacent first capacitances are connected to form a common end of a decoupling unit, and the common ends of a plurality of decoupling units are connected together. The present application solves the problem of electric leakage due to insufficient voltage resistance of a capacitance by connecting a plurality of capacitances in series, thereby improving the voltage resistance of the decoupling unit.

[0021] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not limiting to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description only some of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor under the premise of these drawings.

[0023] FIG. 1 is a circuit diagram of a decoupling circuit according to an embodiment of the present application;

[0024] FIG. 2 is a circuit diagram of a decoupling circuit according to another embodiment of the present application. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be described below through specific concrete examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The present application can also be implemented or applied through other different specific embodiments, and each detail in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The actual implementation of each component can be randomly changed in terms of type, number and proportion, and the layout pattern of the components can also be more complex.

[0027] Although the terms "first", "second", "A", and "B" and the like can be used herein to describe various elements, these elements should not be limited by these terms, and are only used to distinguish one element from another element. For example, without departing from the scope of the technology described below, a first element can be referred to as a second element, and similarly, a second element can be referred to as a first element. The term "and / or" includes a combination of related items or any of the related items.

[0028] As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it will be understood that the term "comprising" means that the presence of the stated features, numbers, steps, operations, elements, or combinations thereof, but does not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

[0029] Before the detailed description of the drawings, it is intended that the division of components in the present specification is divided only by the main function of each component. That is, two or more components to be described below can be combined into one component, or can be divided into two or more components according to a more detailed function. In addition to the main function of the component, each component to be described below can additionally perform some or all of the functions of other components, and some main functions of each component can be exclusively performed by other components.

[0030] With the development of information technology, the requirements for signal acquisition and processing circuit are higher and higher, in order to improve the anti-interference ability of the circuit, the power supply needs to be decoupled design, in the high reliability circuit, especially the anti-radiation reinforced circuit, the reliability requirement of decoupling circuit is higher, with the continuous reduction of process size, the problem of device withstand voltage is more and more serious, resulting in that the traditional power voltage decoupling method is not applicable under advanced process, there are the following two problems: (1) the withstand voltage of decoupling capacitor is not enough, which is easy to be broken down under radiation condition, resulting in leakage; (2) the leakage will worsen the stability of power supply voltage, resulting in that the internal circuit cannot work normally.

[0031] In view of the above-mentioned shortcomings of the prior art, the present application proposes a decoupling circuit for solving the problem that the insufficient withstand voltage of the decoupling capacitor in the traditional implementation scheme causes the decoupling capacitor to be broken down after the decoupling capacitor is broken down, resulting in the decline of the overall performance of the circuit.

[0032] Please refer to Figure 1, which is a circuit diagram of a decoupling circuit according to an embodiment of the present application. As shown in Figure 1, the decoupling circuit comprises:

[0033] At least two decoupling units are connected in parallel; each decoupling unit comprises a first capacitor component and a second capacitor component, and the first capacitor component and the second capacitor component are connected in parallel;

[0034] The first capacitor component comprises at least two first capacitors, and the withstand voltage of each first capacitor is less than the power supply voltage; the second capacitor component comprises a second capacitor, and the at least two first capacitors are connected in series and connected in parallel with the second capacitor;

[0035] In the first capacitor component, the adjacent two first capacitors are connected to form the common end of the decoupling unit, and the common ends of the plurality of decoupling units are connected together.

[0036] The present application solves the problem of leakage caused by insufficient withstand voltage of the capacitor by connecting a plurality of capacitors in series, and improves the withstand voltage of the decoupling unit.

[0037] Referring to FIG. 1, at least two decoupling units in the embodiment of the present application can include a first decoupling unit 11, a second decoupling unit 12,..., and an n-th decoupling unit 1n, and the first decoupling unit 11, the second decoupling unit 12,..., and the n-th decoupling unit 1n are connected in parallel. Wherein, Vdd_in is an input port of the decoupling unit, and is connected to a power supply voltage; Vdd_out is an output port of the decoupling unit, and is connected to a unit circuit to be powered; and Vc is an internal common port of the unit, and is used for internal connection of the decoupling unit, that is, all the decoupling units are connected together through the common port Vc, and the purpose is to save layout area.

[0038] Continuing to refer to FIG. 1, in FIG. 1, each decoupling unit includes a first capacitor assembly and a second capacitor assembly, and the first capacitor assembly and the second capacitor assembly are connected in parallel to form a capacitor structure, and the capacitor structure has an input end and an output end, the input end is connected to the input port Vdd_in, and the output end is connected to the output port Vdd_out.

[0039] The first capacitor assembly includes at least two first capacitors connected in series. It should be noted that the withstand voltage of each first capacitor is less than the power supply voltage, and by connecting at least two first capacitors with a withstand voltage less than the power supply voltage in parallel, the voltage drop on the first capacitor is reduced, so as to solve the problem that the overall performance of the circuit is reduced after the decoupling capacitor is broken down due to insufficient withstand voltage. Referring to FIG. 1, the first capacitor assembly in the first decoupling unit 11 includes a capacitor C1a and a capacitor C1b connected in series; the first capacitor assembly in the second decoupling unit 12 includes a capacitor C2a and a capacitor C2b connected in series, and the first capacitor assembly in the n-th decoupling unit 1n includes a capacitor Cna and a capacitor Cnb connected in series. Of course, in other embodiments, the first capacitor assembly can include more capacitors with a withstand voltage less than the power supply voltage according to the circuit demand, and the number thereof is not limited herein.

[0040] Continuing to refer to FIG. 1, the second capacitor assembly includes one second capacitor, and the two capacitors in the first capacitor assembly are connected in series and then connected in parallel with the second capacitor. The second capacitor assembly of the first decoupling unit 11 includes a capacitor C1c, and the capacitor C1a and the capacitor C1b are connected in series and then connected in parallel with the capacitor C1c; the second capacitor assembly of the second decoupling unit 12 includes a capacitor C2c, and the capacitor C2a and the capacitor C2b are connected in series and then connected in parallel with the capacitor C2c; and the second capacitor assembly of the n-th decoupling unit 1n includes a capacitor C2n, and the capacitor Cna and the capacitor Cnb are connected in series and then connected in parallel with the capacitor Cnc. It should be noted that in the embodiment of the present application, the second capacitor is a capacitor with a withstand voltage greater than or equal to the power supply voltage. Of course, in other embodiments, if the withstand voltage of the second capacitor is less than the power supply voltage, then the second capacitor assembly needs to be composed of a plurality of second capacitors connected in series.

[0041] It should be noted that, in the first capacitor assembly, two adjacent capacitors are connected, and the connection end forms the common end of the decoupling unit, that is, C1a and C1b are connected to form the common end of the first decoupling unit 11, C2a and C2b are connected to form the common end of the second decoupling unit 12, and Cna and Cnb are connected to form the common end of the nth decoupling unit 1n. Then, the common ends of all decoupling units are connected together.

[0042] In the embodiment of the present application, referring to FIG. 1, the decoupling unit further comprises a resistance unit, one end of the resistance unit is connected with one end of the first capacitor assembly and one end of the second capacitor assembly respectively, and the other end of the resistance unit is connected with a power supply voltage.

[0043] It should be noted that the resistance unit comprises at least one resistor, and when the resistance unit comprises a plurality of resistors, the plurality of resistors are connected in parallel or / and in series.

[0044] In the embodiment of the present application, in the embodiment of the present application, the first capacitors of the at least two decoupling units are arranged in the same well.

[0045] For example, the first capacitors C1a, C1b, C2a, C2b,..., Cna and Cnb are arranged in the same well, so that the layout area can be saved.

[0046] In the embodiment of the present application, the first capacitors of part of the decoupling units of the at least two decoupling units are arranged in the same well, or the first capacitors of each of the at least two decoupling units are arranged in different wells respectively.

[0047] If the layout area does not need to be saved, part of the first capacitors C1a, C1b, C2a, C2b,..., Cna and Cnb can be arranged in the same well, or only the first capacitors C1a and C1b, C2a and C2b,..., Cna and Cnb are arranged in the respective wells, as shown in FIG. 2.

[0048] In the embodiment of the present application, in each of the decoupling units, the first capacitor and the second capacitor are arranged in a stack on a layout. For example, the second capacitor C1c and the first capacitors C1a and C1b are arranged in a stack on a layout, so as to improve the unit area capacitance density.

[0049] Referring to FIG. 1, the first decoupling unit 11, the second decoupling unit 12,..., and the nth decoupling unit 1n all adopt the same unit or a proportional unit, so as to ensure that the time constant is the same, that is:

[0050] Generally, C1a, C1b are the same capacitance, C2a, C2b are the same capacitance, …, Cna, Cnb are the same capacitance.

[0051] To sum up, the application achieves the purpose of improving the voltage resistance capability of the decoupling unit by connecting multiple capacitors with voltage resistance less than the power voltage in series; meanwhile, the purpose of improving the unit area capacitance density is achieved by connecting the first capacitor and the second capacitor in parallel and stacking them on the layout; again, the application ensures that the current limiting resistance value inside the sub-decoupling unit is large enough, even if the internal capacitor of the sub-unit is damaged and there is a leakage, a small leakage current can be achieved through resistance current limiting, and on the other hand, the time constant of the overall decoupling unit is unchanged after parallel connection; further, the application realizes the equal time constant of each sub-unit through the same unit and proportional unit.

[0052] The application also provides a power supply comprising the decoupling circuit shown in FIG. 1 or FIG. 2.

[0053] The above embodiments only exemplarily illustrate the principle and effect of the application, and are not used to limit the application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the application should be covered by the claims of the application.

Claims

1. A decoupling circuit for a power supply, characterized in that, The decoupling circuit includes: At least two decoupling units are connected in parallel; each decoupling unit includes a first capacitor assembly and a second capacitor assembly, the first capacitor assembly and the second capacitor assembly being connected in parallel. The first capacitor assembly includes at least two first capacitors, and the voltage rating of each first capacitor is less than the power supply voltage; the second capacitor assembly includes a second capacitor, and the at least two first capacitors are connected in series and then connected in parallel with the second capacitor; In the first capacitor assembly, two adjacent first capacitors are connected to form a common terminal of the decoupling unit, and the common terminals of multiple decoupling units are connected together.

2. The decoupling circuit according to claim 1, characterized in that, The decoupling unit further includes: A resistor unit, one end of which is connected to one end of the first capacitor assembly and one end of the second capacitor assembly, and the other end of which is connected to the power supply voltage.

3. The decoupling circuit according to claim 2, characterized in that, The resistor unit includes at least one resistor, and when the resistor unit includes multiple resistors, the multiple resistors are connected in parallel and / or in series.

4. A decoupling circuit according to claim 1, characterized in that, The first capacitors of the at least two decoupling units are all disposed in the same trap.

5. A decoupling circuit according to claim 1, characterized in that, The first capacitors of some of the at least two decoupling units are disposed in the same trap.

6. A decoupling circuit according to claim 1, characterized in that, The first capacitor of each of the at least two decoupling units is respectively disposed in a different trap.

7. A decoupling circuit according to any one of claims 4-6, characterized in that, In each of the decoupling units, the first capacitor and the second capacitor are stacked on the layout.

8. A decoupling circuit according to claim 1, characterized in that, The decoupling circuit further includes an input port and an output port. The plurality of decoupling units are connected in parallel between the input port and the output port. The input port is connected to the power supply voltage, and the output port is connected to the powered unit circuit.

9. A decoupling circuit according to claim 1, characterized in that, Each of the decoupling units has the same time constant.

10. A power supply, characterized in that, Includes the decoupling circuit as described in any one of claims 1-9.

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