Power rail circuit, power supply and chip

Abstract

The utility model discloses a power rail circuit, a power supply and a chip. The power rail circuit includes: a power input; the input end of the voltage following control circuit is connected with the power supply input end; the constant current source circuit is connected with the output end and the control end of the voltage following control circuit; the power supply output end is connected with the constant current source circuit; the output voltage output by the power supply output end is output along with the input voltage input by the power supply input end through the voltage following control circuit and the constant current source circuit. According to the invention, the time sequence requirement of complex multiple power rails is met, and the performance of a chip is improved.

Description

Technical Field

[0001] The embodiments disclosed in this application relate to the field of circuit technology, and more specifically, to a power rail circuit, power supply, and chip. Background Technology

[0002] In the rapid development of integrated circuit technology, the functional complexity and integration of chips are constantly increasing. To meet the differentiated power supply requirements of different functional modules within a chip, many chips adopt a multi-power-rail power supply design, typically setting up multiple independent power rails to provide specific voltages for different circuit modules. However, with the improvement of chip performance and the increase in operating frequency, the power rails need to meet strict timing requirements to ensure the stable operation of the chip power supply system. Utility Model Content

[0003] According to embodiments of this application, this application proposes a power rail circuit, power supply, and chip to meet the timing requirements of complex multi-power rail applications and improve chip performance.

[0004] The first aspect of this application discloses a power rail circuit, comprising: a power input terminal; a voltage follower control circuit, the input terminal of which is connected to the power input terminal; a constant current source circuit, connected to the output terminal and control terminal of the voltage follower control circuit; and a power output terminal, connected to the constant current source circuit; wherein the output voltage output by the power output terminal is output by following the input voltage input to the power input terminal through the voltage follower control circuit and the constant current source circuit.

[0005] In some embodiments, the voltage follower control circuit includes a first voltage divider circuit, an operational amplifier circuit, and a feedback circuit. The operational amplifier circuit is connected to the first voltage divider circuit and the feedback circuit. A first terminal of the operational amplifier circuit is connected to a first preset node of the first voltage divider circuit, a second terminal of the operational amplifier circuit is connected to the feedback circuit, and a third terminal of the operational amplifier circuit is connected to the constant current source circuit. The feedback circuit is connected to the second terminal of the operational amplifier circuit and a second preset node of the constant current source circuit. The voltage at the first preset node increases with the increase of the input voltage at the power input terminal, and the voltage at the second preset node increases with the increase of the output voltage at the power output terminal. The operational amplifier circuit is used to regulate the output voltage at the power output terminal through the constant current source circuit based on the difference between the voltage at the first preset node and the voltage at the second preset node.

[0006] In some embodiments, the first voltage divider circuit includes a first resistor and a second resistor connected in series, a first end of the first resistor is connected to the power input terminal, a second end of the first resistor is connected to the first end of the second resistor, and a second end of the second resistor is grounded; the first preset node is disposed between the first resistor and the second resistor.

[0007] In some embodiments, the constant current source circuit includes a first transistor, a second transistor, and a third resistor; wherein, the first terminal of the first transistor is connected to the power input terminal, the second terminal of the first transistor is connected to the third terminal of the operational amplifier circuit, and the third terminal of the first transistor is connected to the first terminal of the third resistor; the first terminal of the second transistor is connected to the third terminal of the operational amplifier circuit and the second terminal of the first transistor, the second terminal of the second transistor is connected to the third terminal of the first transistor and the first terminal of the third resistor, and the third terminal of the second transistor is connected to the second terminal of the third resistor; the second terminal of the third resistor is connected to the power output terminal.

[0008] In some embodiments, the constant current source circuit further includes a second voltage divider circuit, which includes a fourth resistor, a fifth resistor, and a sixth resistor; wherein, the first end of the fourth resistor is connected to the second end of the second transistor, and the second end of the fourth resistor is connected to the second end of the third resistor; the first end of the fifth resistor is connected to the second end of the third resistor and the power output terminal, the second end of the fifth resistor is connected to the first end of the sixth resistor, and the second end of the sixth resistor is grounded; the second preset node is disposed between the fifth resistor and the sixth resistor.

[0009] In some embodiments, when the output current output by the power supply output terminal is greater than the current limit of the constant current source circuit, the voltage difference between the second terminal and the third terminal of the second transistor increases, the voltage difference between the first terminal and the third terminal of the second transistor increases, the voltage difference between the second terminal and the third terminal of the first transistor decreases, the voltage difference between the first terminal and the third terminal of the first transistor decreases, and consequently the output current output by the power supply output terminal decreases.

[0010] In some embodiments, the feedback circuit includes a seventh resistor, an eighth resistor, and a first capacitor connected in series; wherein, the first end of the seventh resistor is connected to the voltage input circuit, the second end of the seventh resistor is connected to the first end of the first capacitor and the third end of the operational amplifier circuit; the first end of the eighth resistor is connected to the second end of the first capacitor, and the second end of the eighth resistor is connected to the second end of the operational amplifier circuit and the second preset node of the constant current source circuit.

[0011] In some embodiments, the power rail circuit further includes a power input circuit and a power output circuit; wherein, the power input circuit includes a second capacitor and a third capacitor, a first terminal of the second capacitor is connected to the power input terminal, and a second terminal of the second capacitor is grounded; a first terminal of the third capacitor is connected to the first terminal of the second capacitor and the input terminal of the voltage follower control circuit, and a second terminal of the third capacitor is grounded; the power output circuit includes a fourth capacitor and a fifth capacitor, a first terminal of the fourth capacitor is connected to the power output terminal, and a second terminal of the fourth capacitor is grounded; a first terminal of the fifth capacitor is connected to the first terminal of the fourth capacitor and the constant current source circuit, and a second terminal of the fifth capacitor is grounded.

[0012] The second aspect of this application discloses a power supply including at least one power rail circuit as described in the first aspect.

[0013] The third aspect of this application discloses a chip including at least one power rail circuit as described in the first aspect or a power supply as described in the second aspect.

[0014] The beneficial effects of this application are as follows: The power rail circuit includes a power input terminal, a voltage follower control circuit, a constant current source circuit, and a power output terminal. The input terminal of the voltage follower control circuit is connected to the power input terminal, and the constant current source circuit is connected to the output terminal and control terminal of the voltage follower control circuit. The output voltage output by the power output terminal follows the input voltage input by the power input terminal through the voltage follower control circuit and the constant current source circuit. That is, the voltage follower control circuit can control the output signal of the output terminal of the voltage follower control circuit based on the input voltage and the output voltage, and actively adjust the output of the constant current source circuit so that the output voltage changes with the change of the input voltage. Thus, the power rail circuit meets the timing requirements of complex multi-power rail circuits. Attached Figure Description

[0015] The present application will be further described below with reference to the accompanying drawings and embodiments. In the drawings:

[0016] Figure 1 This is a schematic diagram of the power rail circuit in an embodiment of this application;

[0017] Figure 2 This is a circuit diagram of a power rail circuit according to an embodiment of this application;

[0018] Figure 3 This is a circuit diagram of a power rail circuit according to another embodiment of this application;

[0019] Figure 4 This is a schematic diagram illustrating the effect of voltage following changes in an embodiment of this application;

[0020] Figure 5This is a schematic diagram of the power supply structure according to an embodiment of this application;

[0021] Figure 6 This is a schematic diagram of the chip structure according to an embodiment of this application. Detailed Implementation

[0022] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, "many" in this application means two or more. Moreover, the term "at least one" in this application means any combination of at least two of any one or more of a plurality of objects. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C. Furthermore, the terms "first," "second," and "third" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0024] During the rise and fall of voltage on the power rails of a chip, the voltage difference between them needs to be controlled within a specific threshold range. Exceeding this range can lead to internal circuit logic corruption, abnormal signal transmission, and even permanent chip damage. For example, in high-speed data processing chips, if the voltage difference between the core power rail and the I / O interface power rail exceeds design standards, it will severely affect the accuracy and reliability of data transmission. Currently, existing chip power management technologies still have limitations in meeting the timing requirements of complex multi-power rail systems.

[0025] To address these issues, this application proposes a power rail circuit, a power supply, and a chip.

[0026] To enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Please see Figure 1 , Figure 1This is a schematic diagram of the power rail circuit according to an embodiment of this application. The power rail circuit 100 includes a power input terminal 101, a voltage follower control circuit 20, a constant current source circuit 30, and a power output terminal 401.

[0028] The input terminal 201 of the voltage follower control circuit 20 is connected to the power input terminal 101, and the constant current source circuit 30 is connected to the output terminal 202 and the control terminal 203 of the voltage follower control circuit 20. For example... Figure 1 As shown, power input terminal 101 provides input voltage V_IN to input terminal 201 of voltage follower control circuit 20. Output terminal 202 of voltage follower control circuit 20 is connected to constant current source circuit 30. Constant current source circuit 30 is also connected to control terminal 203 of voltage follower control circuit 20 and power output terminal 401, from which voltage V_OUT is output. In some examples, output voltage V_OUT can be core voltage 1.2V, I / O voltage 3.3V, analog circuit voltage 5V, etc.

[0029] The output voltage from the power output terminal 401 is output by following the input voltage from the power input terminal 101 through the voltage follower control circuit 20 and the constant current source circuit 30. In some examples, the output voltage V_OUT output by the power output terminal 401 follows the input voltage V_IN input by the power input terminal 101 through the voltage follower control circuit 20 and the constant current source circuit 30. The input terminal 201 of the voltage follower control circuit 20 obtains the input voltage V_IN, and the control terminal 203 of the voltage follower control circuit 20 obtains feedback on the output voltage V_OUT. Based on the input voltage V_IN and the output voltage V_OUT, the voltage follower control circuit 20 controls the output signal of the output terminal 202 of the voltage follower control circuit 20. The constant current source circuit 30 adjusts its own output based on the output signal so that the output voltage V_OUT can follow the input voltage V_IN. For example, the output voltage V_OUT increases as the input voltage V_IN increases, or the output voltage V_OUT decreases as the input voltage V_IN decreases. That is, the voltage difference between the output voltage V_OUT and the input voltage V_IN is within a preset range so that they can meet a specific start-up sequence or voltage difference limit.

[0030] In this embodiment, the power rail circuit 100 includes a power input terminal 101, a voltage follower control circuit 20, a constant current source circuit 30, and a power output terminal 401. The input terminal 201 of the voltage follower control circuit 20 is connected to the power input terminal 101, and the constant current source circuit 30 is connected to the output terminal 202 and the control terminal 203 of the voltage follower control circuit 20. The output voltage output by the power output terminal 401 follows the input voltage input by the power input terminal 101 through the voltage follower control circuit 20 and the constant current source circuit 30. That is, the voltage follower control circuit 20 can control the output signal of the output terminal 202 of the voltage follower control circuit 20 based on the input voltage and the output voltage, and actively adjust the output of the constant current source circuit 30 so that the output voltage changes with the change of the input voltage. Thus, the power rail circuit 100 meets the timing requirements of complex multi-power rails.

[0031] like Figure 2 As shown, Figure 2 This is a circuit diagram of a power rail circuit according to an embodiment of this application. The voltage follower control circuit 20 includes a first voltage divider circuit 210, an operational amplifier circuit 220, and a feedback circuit 230. The operational amplifier circuit 220 is connected to the first voltage divider circuit 210 and the feedback circuit 230.

[0032] In some embodiments, such as Figure 2 As shown, the first voltage divider circuit 210 includes a first resistor R1 and a second resistor R2 connected in series. The first end of the first resistor R1 is connected to the power input terminal 101, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is grounded. The resistance values ​​of the first resistor R1 and the second resistor R2 can be set according to the magnitude of the output voltage V_OUT.

[0033] In some embodiments, such as Figure 2 As shown, the constant current source circuit 30 includes a first transistor Q1, a second transistor Q2, and a third resistor R3. In some examples, the first transistor Q1 and the second transistor Q2 can be NPN (Negative-Positive-Negative Transistor) type transistors.

[0034] In this configuration, the first terminal of the first transistor Q1 is connected to the power input terminal 101, the second terminal of the first transistor Q1 is connected to the second transistor Q2, and the third terminal of the first transistor Q1 is connected to the first terminal of the third resistor R3. For example, the collector (c) of the first transistor Q1 is connected to the power input terminal 101, the base (b) of the first transistor Q1 is connected to the second transistor Q2, and the emitter (e) of the first transistor Q1 is connected to the first terminal of the third resistor R3. The first terminal of the second transistor Q2 is connected to the second terminal of the first transistor Q1, the second terminal of the second transistor Q2 is connected to the third terminal of the first transistor Q1 and the first terminal of the third resistor R3, and the third terminal of the second transistor Q2 is connected to the second terminal of the third resistor R3. For example, the collector (c) of the second transistor Q2 is connected to the base of the first transistor Q1, the base (b) of the second transistor Q2 is connected to the emitter of the first transistor Q1 and the first terminal of the third resistor R3, and the emitter (e) of the second transistor Q2 is connected to the second terminal of the third resistor R3. The second terminal of the third resistor R3 is connected to the power output terminal 401.

[0035] In some embodiments, such as Figure 2 As shown, the constant current source circuit 30 also includes a second voltage divider circuit 310, which includes a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The first terminal of the fourth resistor R4 is connected to the third terminal of the second transistor Q2, and the second terminal of the fourth resistor R4 is connected to the second terminal of the third resistor R3. The first terminal of the fifth resistor R5 is connected to the second terminal of the third resistor R3 and the power output terminal 401, and the second terminal of the fifth resistor R5 is connected to the first terminal of the sixth resistor R6. The second terminal of the sixth resistor R6 is grounded. The resistance values ​​of the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 can be set according to the magnitude of the output voltage V_OUT.

[0036] In some embodiments, such as Figure 2 As shown, a first preset node 2101 is provided between the first resistor R1 and the second resistor R2, and a second preset node 3101 is provided between the fifth resistor R5 and the sixth resistor R6.

[0037] The first terminal of the operational amplifier circuit 220 is connected to the first preset node 2101 of the first voltage divider circuit, the second terminal of the operational amplifier circuit 220 is connected to the feedback circuit 230, the third terminal of the operational amplifier circuit 220 is connected to the constant current source circuit 30, and the feedback circuit 230 is also connected to the second preset node 3101 of the constant current source circuit 30.

[0038] The operational amplifier circuit 220 may include an operational amplifier U1. For example, the positive input terminal of the operational amplifier U1 is connected to the first preset node 2101 of the first voltage divider circuit 210, the negative input terminal of the operational amplifier U1 is connected to the second preset node 3101 of the feedback circuit 230 and the constant current source circuit 30, and the output terminal of the operational amplifier U1 is connected to the constant current source circuit 30.

[0039] In some examples, the voltage V_S_IN of the first preset node 2101 increases as the input voltage V_IN input to the power input terminal 101 increases, and the voltage V_FB of the second preset node 3101 increases as the output voltage V_OUT output to the power output terminal 401 increases. The operational amplifier circuit 220 is used to regulate the output voltage output to the power output terminal 401 based on the difference between the voltage of the first preset node 2101 and the voltage of the second preset node 3101.

[0040] For example, the initial voltage at the negative input terminal of operational amplifier U1 is 0V. The voltage V_S_IN at the positive input terminal of operational amplifier U1 increases as the input voltage V_IN rises, and the voltage V_OP_OUT at the output terminal of operational amplifier U1 also rises accordingly, outputting to the input terminal of constant current source circuit 30, which outputs to V_OUT. The voltage V_FB at the second preset node 3101 at the negative input terminal of operational amplifier U1, i.e., the feedback voltage, increases as the output voltage V_OUT output from power supply output terminal 401 rises. When V_FB rises to V_S_IN, the entire loop reaches stability.

[0041] In some embodiments, when the output current output by the power output terminal 401 is greater than the current limiting of the constant current source circuit 30, the voltage difference between the second terminal (b) and the third terminal (e) of the second transistor Q2 increases, the voltage difference between the first terminal (c) and the third terminal (e) of the second transistor Q2 increases, the voltage difference between the second terminal (b) and the third terminal (e) of the first transistor Q1 decreases, the voltage difference between the first terminal (c) and the third terminal (e) of the first transistor Q1 decreases, and consequently the output current output by the power output terminal 401 decreases.

[0042] In some examples, the current limit of the constant current source circuit 30 is I_R3, with a value of Vbe / R3. For example... Figure 2 As shown, when the output current I_OUT from the power supply output terminal 401 is greater than the current limiting current I_R3 of the constant current source circuit 30, Vbe(Q2)=V(R3)=I_OUT*R3 increases accordingly, the transistor operates in the amplification region, and Ice(Q2)=βIbe(Q2) also increases accordingly. At this time, Ibe(Q1)=Is_out-Ice(Q2), that is, Ibe(Q1) decreases in the reverse direction, and further I_OUT=Ice(Q1)=βIbe(Q1) also decreases. Wherein, β is the current amplification factor.

[0043] In some embodiments, such as Figure 3 As shown, Figure 3This is a circuit diagram of a power rail circuit according to another embodiment of this application. The power rail circuit 100 also includes a power input circuit 10 and a power output circuit 40.

[0044] The power input circuit 10 includes a second capacitor C2 and a third capacitor C3. The first terminal of the second capacitor C2 is connected to the power input terminal 101, and the second terminal of the second capacitor C2 is grounded. The first terminal of the third capacitor C3 is connected to the first terminal of the second capacitor C2 and the input terminal of the voltage follower control circuit 20, and the second terminal of the third capacitor C3 is grounded. In some examples, the second capacitor C2 is a low-frequency filter capacitor, and the third capacitor C3 is a high-frequency filter capacitor, used for filtering, energy storage, and input stabilization to improve power quality and reduce system failure risks.

[0045] The power output circuit 40 includes a fourth capacitor C4 and a fifth capacitor C5. The first terminal of the fourth capacitor C4 is connected to the power output terminal 401, and the second terminal of the fourth capacitor C4 is grounded. The first terminal of the fifth capacitor C5 is connected to the first terminal of the fourth capacitor C4 and the constant current source circuit 30, and the second terminal of the fifth capacitor C5 is grounded. In some examples, the fourth capacitor C4 is a low-frequency filter capacitor, and the fifth capacitor C5 is a high-frequency filter capacitor, used to achieve filtering, energy storage, and stable output to improve power quality and reduce the risk of system failure.

[0046] In some examples, power input terminal 101 provides an input voltage V_IN of 3.3V, and power output terminal 401 outputs an output voltage V_OUT of 1.8V. The 1.8V output voltage from power output terminal 401 can be output by following the 3.3V input voltage from power input terminal 101 through voltage follower control circuit 20 and constant current source circuit 30. Accordingly, Figure 3 The parameters of some electrical components in the power rail circuit 100 shown are as follows: C1-0.01μ; C2-10μ; C3-0.01μ; C4-0.01μ; C5-10μ; R11-10kΩ; R12-16.5kΩ; R2-10kΩ; R31-1.5Ω; R32-1.5Ω; R4-10kΩ; R5-10kΩ; R6-10kΩ; R7-240Ω; R8-22kΩ; R9-33Ω; R10 can be a load.

[0047] Among them, V_IN starts at 3.3V. As the input voltage rises, V_S_IN rises with the input voltage V_IN after being divided by resistors. When V_IN = 3.3V, V_S_IN finally reaches:

[0048]

[0049] The initial voltage at the negative input terminal of operational amplifier U1 is 0V. The voltage V_S_IN at the positive input terminal of operational amplifier U1 increases as the input voltage V_IN rises, and the voltage V_OP_OUT at the output terminal of operational amplifier U1 also rises accordingly, outputting to the input terminal of constant current source circuit 30, which outputs to V_OUT. Specifically, the voltage V_FB at the second preset node 3101 at the negative input terminal of operational amplifier U1 rises as the output voltage V_OUT output from power supply output terminal 401 rises. When V_FB rises to V_S_IN, the entire loop reaches stability. At this point:

[0050]

[0051] The current limit of the constant current source circuit 30 is I_(R31+R32), and its magnitude is Vbe / (R31+R32). For example... Figure 2 As shown, when the output current I_OUT output by the power supply output terminal 401 is greater than the current limiting current I_R3 of the constant current source circuit 30, Vbe(Q2)=V(R31+R32)=I_OUT*(R31+R32) increases accordingly, the transistor operates in the amplification region, Ice(Q2)=βIbe(Q2) also increases accordingly, at this time Ibe(Q1)=Is_out-Ice(Q2), that is, Ibe(Q1) decreases in the reverse direction. At this time, I_OUT=Ice(Q1)=βIbe(Q1) can also decrease accordingly.

[0052] Furthermore, the output voltage (V_OUT) of 1.8V output from power output terminal 401 follows the input voltage (V_IN) of 3.3V input from power input terminal 101. Figure 4 As shown, Figure 4 This is a schematic diagram illustrating the effect of voltage following changes in an embodiment of this application. It can be seen that the output voltage V_OUT changes in the same trend as the input voltage V_IN. The output voltage V_OUT increases as the input voltage V_IN increases, and the output voltage V_OUT decreases as the input voltage V_IN decreases.

[0053] Please see Figure 5 , Figure 5 This is a schematic diagram of the power supply structure according to an embodiment of this application. The power supply 500 includes at least one of the above-described power rail circuits 100, wherein the power rail circuits 100 enable the output voltage to change in accordance with the changes in the input voltage, thereby enabling the power supply 500 to meet the timing requirements of complex multi-power rails.

[0054] Please see Figure 6 , Figure 6 This is a schematic diagram of the chip structure according to an embodiment of this application. Chip 600 includes at least one of the aforementioned power rail circuits 100, such as... Figure 6 As shown in (a) above. Alternatively, chip 600 includes the aforementioned power supply 500, as shown in [example]. Figure 6 As shown in (b) of the diagram. The output voltage changes in accordance with the input voltage through the power rail circuit 100 or the power supply 500, thereby enabling the chip 600 to meet the timing requirements of complex multi-power rails and improving its operating performance.

[0055] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0056] In the several embodiments provided in this application, it should be understood that the disclosed methods and related devices can be implemented in other ways. For example, the related device implementations described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication disconnection shown or discussed may be indirect coupling or communication disconnection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0057] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0058] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0059] Those skilled in the art will readily recognize that numerous modifications and variations can be made to the apparatus and method while maintaining the teachings of this application. Therefore, the above disclosure should be considered limited only by the scope of the appended claims.

Claims

1. A power rail circuit, characterized in that, include: Power input terminal; A voltage follower control circuit, wherein the input terminal of the voltage follower control circuit is connected to the power input terminal; A constant current source circuit is connected to the output and control terminals of the voltage follower control circuit. The power output terminal is connected to the constant current source circuit. The output voltage from the power supply output terminal is output by following the input voltage from the power supply input terminal through the voltage follower control circuit and the constant current source circuit.

2. The circuit of claim 1, wherein, The voltage follower control circuit includes a first voltage divider circuit, an operational amplifier circuit, and a feedback circuit, wherein the operational amplifier circuit is connected to the first voltage divider circuit and the feedback circuit. Wherein, the first terminal of the operational amplifier circuit is connected to the first preset node of the first voltage divider circuit, the second terminal of the operational amplifier circuit is connected to the feedback circuit, and the third terminal of the operational amplifier circuit is connected to the constant current source circuit; the feedback circuit is connected to the second terminal of the operational amplifier circuit and the second preset node of the constant current source circuit. The voltage of the first preset node increases as the input voltage at the power input terminal increases, and the voltage of the second preset node increases as the output voltage at the power output terminal increases. The operational amplifier circuit is used for: Based on the difference between the voltage of the first preset node and the voltage of the second preset node, the output voltage output by the power supply output terminal is regulated by the constant current source circuit.

3. The circuit of claim 2, wherein, The first voltage divider circuit includes a first resistor and a second resistor connected in series. The first end of the first resistor is connected to the power input terminal, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is grounded. The first preset node is located between the first resistor and the second resistor.

4. The circuit of claim 2, wherein, The constant current source circuit includes a first transistor, a second transistor, and a third resistor; Wherein, the first end of the first transistor is connected to the power input terminal, the second end of the first transistor is connected to the third terminal of the operational amplifier circuit, and the third end of the first transistor is connected to the first end of the third resistor; The first terminal of the second transistor is connected to the third terminal of the operational amplifier circuit and the second terminal of the first transistor; the second terminal of the second transistor is connected to the third terminal of the first transistor and the first terminal of the third resistor; the third terminal of the second transistor is connected to the second terminal of the third resistor. The second end of the third resistor is connected to the power output terminal.

5. The circuit of claim 4, wherein, The constant current source circuit further includes a second voltage divider circuit, which includes a fourth resistor, a fifth resistor, and a sixth resistor. Wherein, the first end of the fourth resistor is connected to the third end of the second transistor, and the second end of the fourth resistor is connected to the second end of the third resistor; The first end of the fifth resistor is connected to the second end of the third resistor and the power output terminal, the second end of the fifth resistor is connected to the first end of the sixth resistor, and the second end of the sixth resistor is grounded. The second preset node is located between the fifth resistor and the sixth resistor.

6. The circuit according to claim 4, characterized in that, When the output current output by the power supply output terminal is greater than the current limit of the constant current source circuit, the voltage difference between the second terminal and the third terminal of the second transistor increases, the voltage difference between the first terminal and the third terminal of the second transistor increases, the voltage difference between the second terminal and the third terminal of the first transistor decreases, the voltage difference between the first terminal and the third terminal of the first transistor decreases, and consequently the output current output by the power supply output terminal decreases.

7. The circuit of claim 2, wherein, The feedback circuit includes a seventh resistor, an eighth resistor, and a first capacitor connected in series; Wherein, the first end of the seventh resistor is connected to the voltage input circuit, and the second end of the seventh resistor is connected to the first end of the first capacitor and the third end of the operational amplifier circuit; the first end of the eighth resistor is connected to the second end of the first capacitor, and the second end of the eighth resistor is connected to the second end of the operational amplifier circuit and the second preset node of the constant current source circuit.

8. The circuit of claim 1, wherein, The power rail circuit also includes a power input circuit and a power output circuit. The power input circuit includes a second capacitor and a third capacitor. The first terminal of the second capacitor is connected to the power input terminal, and the second terminal of the second capacitor is grounded. The first terminal of the third capacitor is connected to the first terminal of the second capacitor and the input terminal of the voltage follower control circuit, and the second terminal of the third capacitor is grounded. The power output circuit includes a fourth capacitor and a fifth capacitor. The first end of the fourth capacitor is connected to the power output terminal, and the second end of the fourth capacitor is grounded. The first end of the fifth capacitor is connected to the first end of the fourth capacitor and the constant current source circuit, and the second end of the fifth capacitor is grounded.

9. A power supply, characterized by, It includes at least one power rail circuit as described in any one of claims 1 to 8.

10. A chip, characterized in that, It includes at least one power rail circuit as described in any one of claims 1 to 8 or the power supply as described in claim 9.

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