DSP chip power supply circuit

Abstract

The utility model provides a DSP chip power supply circuit, comprising a first power supply module for providing a power supply VCC1V8DSP for a DSP chip, a second power supply module for providing a power supply VCC1V5DSP, and a third power supply module for providing a power supply VDD0V9, the first power supply module supplies power to the DSP chip and a first peripheral circuit of the DSP chip; the second power supply module supplies power to the DSP chip and a second peripheral circuit of the DSP chip; the third power supply module supplies power to the DSP chip, the second peripheral circuit of the DSP chip and the third peripheral circuit of the DSP chip; and the first peripheral circuit, the second peripheral circuit and the third peripheral circuit comprise a circuit formed by connecting a plurality of capacitors in parallel. According to the utility model, reliable power supply can be provided for the DSP chip, and the power supply safety of the DSP chip is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of power supply circuit design, in particular to a DSP chip power supply circuit. Background Art

[0002] DSP chips have been widely used in many fields such as signal processing, communication, radar, power system, automatic control, etc. When processing high-precision signals, DSP is very sensitive to power supply noise. A dedicated power supply circuit can reduce power supply noise and avoid affecting the quality of signal processing. Therefore, it is necessary to design a dedicated DSP chip power supply circuit. Utility Model Content

[0003] The utility model aims to at least solve the technical problems existing in the prior art, and in particular innovatively proposes a DSP chip power supply circuit.

[0004] In order to achieve the above-mentioned purpose of the utility model, the utility model provides a DSP chip power supply circuit, including a first power supply module that provides power VCC1V8_DSP for the DSP chip, a second power supply module that provides power VCC1V5_DSP, and a third power supply module that provides power VDD0V9, wherein the first power supply module supplies power to the DSP chip and the first peripheral circuit of the DSP chip; the second power supply module supplies power to the DSP chip and the second peripheral circuit of the DSP chip; the third power supply module supplies power to the DSP chip, the second peripheral circuit of the DSP chip, and the third peripheral circuit of the DSP chip;

[0005] The first peripheral circuit, the second peripheral circuit and the third peripheral circuit include circuits in which a plurality of capacitors are connected in parallel.

[0006] Furthermore, the first peripheral circuit also includes: a first end of capacitor C185, a first end of capacitor C192, a first end of capacitor C197, and an input end of capacitor C208 are connected to a voltage regulating end (VDD18_VQPS) of the DSP chip; a second end of capacitor C185, a second end of capacitor C192, and a second end of capacitor C197 are connected to a power ground;

[0007] The first end of capacitor C181, the first end of capacitor C188, the first end of capacitor C193, and the input end of capacitor C205 are connected to the PLL circuit power supply end (VDD18_PLL) of the DSP chip; the second end of capacitor C181, the second end of capacitor C188, and the second end of capacitor C193 are connected to the power ground;

[0008] The first end of capacitor C182, the first end of capacitor C189, the first end of capacitor C194, the first end of capacitor C200, and the input end of capacitor C206 are connected to the power supply end (VDD18_DDR_PLL) of the PLL circuit related to the DDR memory of the DSP chip; the second end of capacitor C182, the second end of capacitor C189, the second end of capacitor C194, and the second end of capacitor C200 are connected to the power ground;

[0009] The output end of capacitor C208, the output end of capacitor C205, the output end of capacitor C206, the first end of capacitor C216, the first end of capacitor C219 are connected to the power supply VCC1V8_DSP; the second end of capacitor C216, the second end of capacitor C219 are connected to the power supply VCC1V8_DSP.

[0010] Furthermore, the second peripheral circuit further includes:

[0011] The first end of capacitor C155, the first end of capacitor C164, the first end of capacitor C173, and the input end of capacitor C177 are connected to the first power supply end (VDDP15_VPTX1) of the transmitting module of the DSP chip; the second end of capacitor C155, the second end of capacitor C164, and the second end of capacitor C173 are connected to the power ground; the output end of capacitor C177 is connected to the power supply VCC1V5_DSP;

[0012] The first end of capacitor C157, the first end of capacitor C166, the first end of capacitor C174, and the input end of capacitor C178 are connected to the second power supply end (VDDP15_VPTX2) of the transmitting module of the DSP chip; the second end of capacitor C157, the second end of capacitor C166, and the second end of capacitor C174 are connected to the power ground; the output end of capacitor C178 is connected to the power supply VCC1V5_DSP;

[0013] The first end of capacitor C158, the first end of capacitor C169, the first end of capacitor C175, and the input end of capacitor C179 are connected to the power supply end (VDDPLL0V9) of the DSP chip phase-locked loop (PLL); the second end of capacitor C158, the second end of capacitor C169, and the second end of capacitor C175 are connected to the power ground; the output end of capacitor C179 and the first end of capacitor C180 are connected to the power supply VDD0V9; the second end of capacitor C180 is connected to the power ground;

[0014] The first end of capacitor C202, the first end of capacitor C210, the first end of capacitor C214, and the input end of capacitor C217 are connected to the third power supply end (VDDP15_VPTX3) of the transmitting module of the DSP chip; the second end of capacitor C202, the second end of capacitor C210, and the second end of capacitor C214 are connected to the power ground; the output end of capacitor C217 is connected to the power supply VCC1V5_DSP;

[0015] The first end of capacitor C203, the first end of capacitor C211, the first end of capacitor C215, and the input end of capacitor C218 are connected to the second power supply end (VDDP15_VPTX2) of the transmitting module of the DSP chip; the second end of capacitor C203, the second end of capacitor C211, and the second end of capacitor C215 are connected to the power ground; the output end of capacitor C218 is connected to the power supply VCC1V5_DSP.

[0016] Furthermore, capacitor C208, capacitor C205, capacitor C206, capacitor C177, capacitor C178, capacitor C179, capacitor C217, and capacitor C218 are through-hole capacitors.

[0017] Furthermore, the model of the feedthrough capacitor is NFM21CC221R1H3.

[0018] Further, the first power supply module includes: a first end of a capacitor C44, a first end of a capacitor C47, a first end of a capacitor C50, a power input terminal VIN of a synchronous buck converter U8 connected to a power supply VCC12V, an enable terminal EN of the synchronous buck converter U8 connected to a first end of a resistor R50, an internal power supply terminal VCC of the synchronous buck converter U8 connected to a first end of a capacitor C46, ​​a mode selection terminal MODE of the synchronous buck converter U8 connected to a first end of a resistor R51, a chip select terminal CS of the synchronous buck converter U8 connected to a first end of a resistor R52, a bootstrap power supply terminal BST of the synchronous buck converter U8 connected to a first end of a resistor R57, The first end of the resistor R57 is connected to the first end of the capacitor C56, the second end of the capacitor C56 is connected to the power switch terminals SW1, SW2 of the synchronous buck converter U8, and the first end of the inductor L3, the second end of the inductor L3 outputs the power supply VCC1.8V, wherein the inductor L3 is used as the energy storage inductor of the DCDC power supply, and cooperates with the MOS tube inside the DCDC chip to complete the voltage conversion; and is connected to the first end of the capacitor C349, the first end of the resistor R66, the first end of the capacitor C65, the first end of the capacitor C68, the first end of the capacitor C71, and the first end of the resistor R210; the second end of the resistor R210 outputs the power supply VCC1V8 DSP; the second end of capacitor C349 is connected to the first end of resistor R60, the second end of resistor R60 is connected to the feedback end FB of synchronous buck converter U8, the second end of resistor R66, and the first end of resistor R67, the state indication end PGOOD of synchronous buck converter U8 is connected to the first end of resistor R65, the second end of resistor R65 is connected to the power supply VCC3.3V, the reference end REF of synchronous buck converter U8 is connected to the first end of capacitor C59, the ground ends AGND, PGND1, and PGND2 of synchronous buck converter U8, the second end of capacitor C59, the second end of resistor R67, the second end of capacitor C65, the second end of capacitor C68, the second end of capacitor C71, the second end of capacitor C44, the second end of capacitor C47, the second end of capacitor C50, the second end of capacitor C46, ​​the second end of resistor R50, the second end of resistor R55, and the second end of resistor R52 are connected to the power ground.

[0019] Furthermore, the second power supply module includes:

[0020] A first end of capacitor C46, ​​a first end of capacitor C49, a first end of capacitor C52, and a power input end VIN of the synchronous buck converter U10 are connected to the power supply VCC12V, an enable end EN of the synchronous buck converter U10 is connected to a first end of the resistor R50, an internal power supply end VCC of the synchronous buck converter U10 is connected to a first end of capacitor C55, a mode selection end MODE of the synchronous buck converter U10 is connected to a first end of the resistor R55, a chip select end CS of the synchronous buck converter U10 is connected to a first end of the resistor R56, a bootstrap power supply end BST of the synchronous buck converter U10 is connected to a first end of the resistor R59, a second end of the resistor R59 is connected to a first end of the capacitor C58, a second end of the capacitor C58 is connected to the power switch ends SW1, SW2 of the synchronous buck converter U10, and a first end of the inductor L5, and a second end of the inductor L5 outputs the power supply VCC1V5 DSP, wherein the inductor L5 is used as the energy storage inductor of the DCDC power supply, and cooperates with the MOS tube inside the DCDC chip to complete the voltage conversion; and is connected to the first end of the capacitor C349, the first end of the resistor R70, the first end of the capacitor C67, the first end of the capacitor C70, and the first end of the capacitor C73; the second end of the capacitor C349 is connected to the first end of the resistor R62, the second end of the resistor R62 is connected to the feedback end FB of the synchronous buck converter U10, the second end of the resistor R70, and the first end of the resistor R71, and the state indication end PGOOD of the synchronous buck converter U10 is connected to the first end of the resistor R65, The second end of resistor R65 is connected to the power supply VCC3.3V, the reference end REF of the synchronous buck converter U10 is connected to the first end of capacitor C61, the ground terminals AGND, PGND1, PGND2 of the synchronous buck converter U10, the second end of capacitor C61, the second end of resistor R71, the second end of capacitor C67, the second end of capacitor C70, the second end of capacitor C73, the second end of capacitor C46, ​​the second end of capacitor C49, the second end of capacitor C52, the second end of capacitor C55, the second end of resistor R50, the second end of resistor R56, and the second end of resistor R56 are connected to the power ground.

[0021] Furthermore, the models of the synchronous buck converter U8 and the synchronous buck converter U10 are IS6605A.

[0022] Furthermore, the third power supply module includes:

[0023] The voltage input terminals VIN1 and VIN2 of the synchronous buck converter U2, the first terminal of the capacitor C84, the first terminal of the capacitor C85, the first terminal of the capacitor C86, the first terminal of the capacitor C87, and the first terminal of the capacitor C88 are connected to the power supply VCC12V, and the second terminals of the capacitor C84, the second terminal of the capacitor C85, the second terminal of the capacitor C86, the second terminal of the capacitor C87, and the second terminal of the capacitor C88 are connected to the power supply ground.

[0024] An internal power supply terminal VCC of the synchronous buck converter U2 is connected to a first end of a capacitor C90, a first end of a resistor R84, a first end of a resistor R83, a phase address setting terminal ADDPH of the synchronous buck converter U2, and a first end of a resistor R85, a second end of the resistor R85 is connected to a power ground, and a second end of the capacitor C90 and a ground terminal AGND of the synchronous buck converter U2 are connected to a power ground;

[0025] The driving power supply terminal VDRV of the synchronous buck converter U2 is connected to the second end of the resistor R84 and the first end of the capacitor C89. The second end of the capacitor C89 is connected to the power ground.

[0026] The power good indication terminal PG of the open drain output of the synchronous buck converter U2 is connected to the second end of the resistor R83.

[0027] The clock terminal SCL of the synchronous buck converter U2 is connected to the first terminal of the resistor R247.

[0028] The data terminal SDA of the synchronous buck converter U2 is connected to the first terminal of the resistor R248.

[0029] The alarm terminal ALT of the synchronous buck converter U2 is connected to the first terminal of the resistor R249.

[0030] The second end of the resistor R247, the second end of the resistor R248, and the second end of the resistor R249 are connected to the power supply VCC3.3V;

[0031] The enable terminal EN of the synchronous buck converter U2 is connected to the first terminal of the resistor R82, and the second terminal of the resistor R82 is connected to the power ground.

[0032] The bootstrap connection terminal BST of the synchronous buck converter U2 is connected to the first end of the resistor R86, the second end of the resistor R86 is connected to the first end of the capacitor C92, the switch output terminals SW1 and SW2 of the synchronous buck converter U2 are connected to the second end of the capacitor C92, the first end of the resistor R90, and the first end of the inductor L7, the second end of the inductor L7 outputs the power supply VDD0V9, and is connected to the first end of the resistor R94, the first end of the capacitor C94, the first end of the capacitor C95, the first end of the capacitor C96, the first end of the capacitor C97, the first end of the capacitor C98, the first end of the capacitor C99, and the first end of the capacitor C100, wherein the inductor L7 is used as an energy storage inductor of the DCDC power supply, and cooperates with the MOS tube inside the DCDC chip to complete the voltage conversion;

[0033] The remote sensing return terminal VFB of the synchronous buck converter U2 is connected to the first end of the resistor R87, the first end of the resistor R91, and the first end of the resistor R92. The second end of the resistor R91 is connected to the first end of the capacitor C93. The second end of the capacitor C93 is connected to the second end of the resistor R94 and the second end of the resistor R92.

[0034] The output remote sensing feedback terminal RGND of the synchronous buck converter U2 is connected to the second end of the resistor R87 and the first end of the resistor R95, and the second end of the resistor R95, the second end of the capacitor C94, the second end of the capacitor C95, the second end of the capacitor C96, the second end of the capacitor C97, the second end of the capacitor C98, the second end of the capacitor C99, and the second end of the capacitor C100 are connected to the power ground;

[0035] The phase shear terminal PS# of the synchronous buck converter U2 is connected to the first terminal of the capacitor R88, and the second terminal of the capacitor R88 is connected to the internal power supply terminal VCC of the synchronous buck converter U2;

[0036] The reference current setting terminal ISET of the synchronous buck converter U2 is connected to the first end of the resistor R93, the second end of the resistor R93 is connected to the power ground, the PMBus address setting terminal ADDR of the synchronous buck converter U2 is connected to the first end of the resistor R89, and the second end of the resistor R89 ​​is connected to the power ground.

[0037] Furthermore, the model of the synchronous buck converter U2 is IS6608A.

[0038] In summary, due to the adoption of the above technical solution, the utility model can reliably supply power to the DSP chip and prevent interference, thereby ensuring the power supply safety of the DSP chip.

[0039] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0041] Figure 1 It is a connection schematic diagram of the utility model.

[0042] Figure 2 This is a schematic diagram of the first connection part of the DSP chip of the utility model.

[0043] Figure 3 This is a schematic diagram of the second connection part of the DSP chip of the utility model.

[0044] Figure 4It is a connection diagram of the third part of the DSP chip of the utility model.

[0045] Figure 5 This is the fourth connection diagram of the DSP chip of the utility model.

[0046] Figure 6 This is the fifth connection diagram of the DSP chip of the utility model.

[0047] Figure 7 This is a schematic diagram of the connection of the first power supply module of the DSP chip of the utility model.

[0048] Figure 8 It is a connection diagram of the second power supply module of the DSP chip of the utility model.

[0049] Fig. 9 It is a schematic diagram of the connection of part of the third power supply module of the DSP chip of the utility model.

[0050] Fig.10 It is a schematic diagram of the connection of part of the third power supply module of the DSP chip of the utility model. DETAILED DESCRIPTION

[0051] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0052] The utility model proposes a DSP chip power supply circuit, such as Figure 1 As shown: the DSP chip is connected to the first power supply module, the second power supply module, and the third power supply module respectively. The circuit of the DSP chip includes 5 peripheral circuits, such as Figure 2 to Figure 6 As shown; the model of the DSP chip is preferably ft_m6678;

[0053] The first peripheral circuit includes: a first end of a capacitor C185, a first end of a capacitor C192, a first end of a capacitor C197, and an input end of a capacitor C208 connected to a voltage regulating end (VDD18_VQPS) of a DSP chip; a second end of a capacitor C185, a second end of a capacitor C192, and a second end of a capacitor C197 connected to a power ground;

[0054] The first end of capacitor C181, the first end of capacitor C188, the first end of capacitor C193, and the input end of capacitor C205 are connected to the PLL circuit power supply end (VDD18 PLL) of the DSP chip; the second end of capacitor C181, the second end of capacitor C188, and the second end of capacitor C193 are connected to the power ground;

[0055] The first end of capacitor C182, the first end of capacitor C189, the first end of capacitor C194, the first end of capacitor C200, and the input end of capacitor C206 are connected to the power supply end (VDD18_DDR_PLL) of the PLL circuit related to the DDR memory of the DSP chip; the second end of capacitor C182, the second end of capacitor C189, the second end of capacitor C194, and the second end of capacitor C200 are connected to the power ground;

[0056] The output end of capacitor C208, the output end of capacitor C205, the output end of capacitor C206, the first end of capacitor C216, the first end of capacitor C219 are connected to power supply VCC1V8_DSP; the second end of capacitor C216, the second end of capacitor C219 are connected to power supply VCC1V8_DSP;

[0057] The capacitors C208, C205 and C206 are through-hole capacitors. Since there is no parasitic inductance of the pins, they have excellent performance in filtering high-frequency interference and are used for filtering on power supplies that are sensitive to power supply noise. The models of the capacitors C208, C205 and C206 are NFM21CC221R1H3.

[0058] The first peripheral circuit also includes: a power supply VCC1V8_DSP is connected to a first end of a capacitor C138, a first end of a capacitor C1380, a first end of a capacitor C147, a first end of a capacitor C156, and a first end of a capacitor C163; a second end of the capacitor C138, a second end of the capacitor C1380, a second end of the capacitor C147, a second end of the capacitor C156, and a second end of the capacitor C163 are connected to a power ground;

[0059] By connecting capacitors in parallel in the power supply circuit, voltage fluctuations and noise in the power supply line can be reduced, providing a smoother DC voltage.

[0060] The second peripheral circuit includes: a power supply VCC1V8_DSP is connected to a first end of a capacitor C134, a first end of a capacitor C142, a first end of a capacitor C146, a first end of a capacitor C154, and a first end of a capacitor C162; a second end of the capacitor C134, a second end of the capacitor C142, a second end of the capacitor C146, a second end of the capacitor C154, and a second end of the capacitor C162 are connected to a power ground;

[0061] In addition, the power supply VCC1V8_DSP is also connected to the first end of capacitor C135, the first end of capacitor C139, the first end of capacitor C143, the first end of capacitor C148, the first end of capacitor C151, the first end of capacitor C159, the first end of capacitor C165, and the first end of capacitor C170; the second end of capacitor C135, the second end of capacitor C139, the second end of capacitor C143, the second end of capacitor C148, the second end of capacitor C151, the second end of capacitor C159, the second end of capacitor C165, and the second end of capacitor C170 are connected to the power ground;

[0062] In addition, the power supply VCC1V8_DSP is also connected to the first end of capacitor C183, the first end of capacitor C186, the first end of capacitor C190, the first end of capacitor C195, the first end of capacitor C198, the first end of capacitor C201, the first end of capacitor C207, and the first end of capacitor C212; the second end of capacitor C183, the second end of capacitor C186, the second end of capacitor C190, the second end of capacitor C195, the second end of capacitor C198, the second end of capacitor C201, the second end of capacitor C207, and the second end of capacitor C212 are connected to the power ground;

[0063] In addition, the power supply VCC1V8_DSP is also connected to the first end of capacitor C184, the first end of capacitor C187, the first end of capacitor C191, the first end of capacitor C196, the first end of capacitor C199, the first end of capacitor C204, the first end of capacitor C209, and the first end of capacitor C213; the second end of capacitor C184, the second end of capacitor C187, the second end of capacitor C191, the second end of capacitor C196, the second end of capacitor C199, the second end of capacitor C204, the second end of capacitor C209, and the second end of capacitor C213 are connected to the power ground; this is because the DSP chip has many identical power PINs, each PIN is connected to a filter capacitor, so there is a parallel circuit of multiple capacitors.

[0064] The third peripheral circuit includes: a first end of a capacitor C155, a first end of a capacitor C164, a first end of a capacitor C173, and an input end of a capacitor C177 are connected to a first power supply end (VDDP15_VPTX1) of a transmitting module of a DSP chip; a second end of a capacitor C155, a second end of a capacitor C164, and a second end of a capacitor C173 are connected to a power ground; and an output end of a capacitor C177 is connected to a power supply VCC1V5_DSP;

[0065] The first end of capacitor C157, the first end of capacitor C166, the first end of capacitor C174, and the input end of capacitor C178 are connected to the second power supply end (VDDP15_VPTX2) of the transmitting module of the DSP chip; the second end of capacitor C157, the second end of capacitor C166, and the second end of capacitor C174 are connected to the power ground; the output end of capacitor C178 is connected to the power supply VCC1V5_DSP;

[0066] The first end of capacitor C158, the first end of capacitor C169, the first end of capacitor C175, and the input end of capacitor C179 are connected to the power supply end (VDDPLL0V9) of the DSP chip phase-locked loop (PLL); the second end of capacitor C158, the second end of capacitor C169, and the second end of capacitor C175 are connected to the power ground; the output end of capacitor C179 and the first end of capacitor C180 are connected to the power supply VDD0V9; the second end of capacitor C180 is connected to the power ground;

[0067] The first end of capacitor C202, the first end of capacitor C210, the first end of capacitor C214, and the input end of capacitor C217 are connected to the third power supply end (VDDP15_VPTX3) of the transmitting module of the DSP chip; the second end of capacitor C202, the second end of capacitor C210, and the second end of capacitor C214 are connected to the power ground; the output end of capacitor C217 is connected to the power supply VCC1V5_DSP;

[0068] The first end of capacitor C203, the first end of capacitor C211, the first end of capacitor C215, and the input end of capacitor C218 are connected to the second power supply end (VDDP15_VPTX2) of the transmitting module of the DSP chip; the second end of capacitor C203, the second end of capacitor C211, and the second end of capacitor C215 are connected to the power ground; the output end of capacitor C218 is connected to the power supply VCC1V5_DSP;

[0069] Among them, capacitors C177, C178, C179, C217, and C218 are through-hole capacitors. Because there is no parasitic inductance of the pins, they have excellent performance in filtering high-frequency interference and are used for filtering on power supplies that are sensitive to power supply noise. The models of capacitors C177, C178, C179, C217, and C218 are NFM21CC221R1H3.

[0070] The third peripheral circuit also includes:

[0071] The regulating power supply VP_09_ADJ is connected to the first end of the capacitor C124, the first end of the capacitor C125, the first end of the capacitor C126, the first end of the capacitor C127, the first end of the capacitor C128, the first end of the capacitor C129, the first end of the capacitor C130, the first end of the capacitor C131, the first end of the capacitor C132, and the first end of the capacitor C133, and the second end of the capacitor C124, the second end of the capacitor C125, the second end of the capacitor C126, the second end of the capacitor C127, the second end of the capacitor C128, the second end of the capacitor C129, the second end of the capacitor C130, the second end of the capacitor C131, the second end of the capacitor C132, and the second end of the capacitor C133 are connected to the power ground;

[0072] Since the DSP chip has many identical power PINs, each PIN is connected to a filter capacitor, so there is a parallel circuit of multiple capacitors. In addition, the interference ripple frequency in the circuit is very wide. A certain type of capacitor can only filter out interference ripples in a certain frequency band due to the existence of parasitic inductance. Therefore, a power supply needs a combination of capacitors with different capacitance values ​​to filter out the interference ripple on the power supply. In addition, the chip has many power PINs, and at least one capacitor is required for each PIN. Therefore, there will be many capacitors on the power supply.

[0073] The fourth peripheral circuit and the fifth peripheral circuit are similar to the second peripheral circuit, with several capacitors connected in parallel, one end connected to the power supply VDD0V9, and the other end connected to the power ground. By connecting several capacitors in parallel, through-hole capacitor filtering is added for power supply filtering that is sensitive to ripple.

[0074] The first power supply module, the second power supply module, and the third power supply module are as follows: Figure 7 to Figure 10 As shown:

[0075] The first power supply module includes:

[0076] The first end of capacitor C44, the first end of capacitor C47, the first end of capacitor C50, the power input terminal VIN of synchronous buck converter U8 are connected to the power supply VCC12V, the enable terminal EN of synchronous buck converter U8 is connected to the first end of resistor R50, the internal power supply terminal VCC of synchronous buck converter U8 is connected to the first end of capacitor C46, ​​the mode selection terminal MODE of synchronous buck converter U8 is connected to the first end of resistor R51, the chip select terminal CS of synchronous buck converter U8 is connected to the first end of resistor R52, and the self- For example, the power supply terminal BST is connected to the first end of the resistor R57, the second end of the resistor R57 is connected to the first end of the capacitor C56, the second end of the capacitor C56 is connected to the power switch terminals SW1, SW2 of the synchronous buck converter U8, and the first end of the inductor L3, and the second end of the inductor L3 outputs the power supply VCC1.8V, wherein the inductor L3 is used as the energy storage inductor of the DCDC power supply, and cooperates with the MOS tube inside the DCDC chip to complete the voltage conversion; and is connected to the first end of the capacitor C349, the first end of the resistor R66, the first end of the capacitor C65, and the first end of the capacitor C68 , the first end of capacitor C71 and the first end of resistor R210 are connected; the second end of resistor R210 outputs power supply VCC1V8_DSP; the second end of capacitor C349 is connected to the first end of resistor R60, the second end of resistor R60 is connected to the feedback end FB of synchronous buck converter U8, the second end of resistor R66, and the first end of resistor R67, the state indication end PGOOD of synchronous buck converter U8 is connected to the first end of resistor R65, the second end of resistor R65 is connected to power supply VCC3.3V, and the reference end RE ...0, the second end of resistor R60 is connected to the feedback end FB of synchronous buck converter U8, the second end of resistor R66, and the first end of resistor R67, the state indication end PGOOD of synchronous buck converter U8 is connected to the first end of resistor R65, the second end of resistor R65 is connected to power supply VCC3.3V, and the reference end RE of synchronous buck converter U8 is connected to the first end of resistor R65, the second end of resistor R65 is connected to F is connected to the first end of capacitor C59, the ground terminals AGND, PGND1, and PGND2 of the synchronous buck converter U8, the second end of capacitor C59, the second end of resistor R67, the second end of capacitor C65, the second end of capacitor C68, the second end of capacitor C71, the second end of capacitor C44, the second end of capacitor C47, the second end of capacitor C50, the second end of capacitor C46, ​​the second end of resistor R50, the second end of resistor R55, and the second end of resistor R52 are connected to the power ground; the model of the synchronous buck converter U8 is IS6605A.

[0077] The second power supply module includes:

[0078] The first end of the capacitor C46, ​​the first end of the capacitor C49, the first end of the capacitor C52, and the power input terminal VIN of the synchronous buck converter U10 are connected to the power supply VCC12V, the enable terminal EN of the synchronous buck converter U10 is connected to the first end of the resistor R50, the internal power supply terminal VCC of the synchronous buck converter U10 is connected to the first end of the capacitor C55, the mode selection terminal MODE of the synchronous buck converter U10 is connected to the first end of the resistor R55, and the chip select terminal CS of the synchronous buck converter U10 is connected to the first end of the resistor R56. One end is connected, the bootstrap power supply end BST of the synchronous buck converter U10 is connected to the first end of the resistor R59, the second end of the resistor R59 is connected to the first end of the capacitor C58, the second end of the capacitor C58 is connected to the power switch ends SW1, SW2 of the synchronous buck converter U10, and the first end of the inductor L5, and the second end of the inductor L5 outputs the power supply VCC1V5_DSP, wherein the inductor L5 serves as the energy storage inductor of the DCDC power supply, cooperates with the MOS tube inside the DCDC chip to complete the voltage conversion; and is connected to the first end of the capacitor C349. The first end of the synchronous buck converter U10 is connected to the first end of the resistor R70, the first end of the capacitor C67, the first end of the capacitor C70, and the first end of the capacitor C73; the second end of the capacitor C349 is connected to the first end of the resistor R62, the second end of the resistor R62 is connected to the feedback end FB of the synchronous buck converter U10, the second end of the resistor R70, and the first end of the resistor R71, the state indication end PGOOD of the synchronous buck converter U10 is connected to the first end of the resistor R65, the second end of the resistor R65 is connected to the power supply VCC3.3V, and the synchronous buck converter A reference terminal REF of U10 is connected to a first end of a capacitor C61, and ground terminals AGND, PGND1, and PGND2 of the synchronous buck converter U10, a second end of capacitor C61, a second end of resistor R71, a second end of capacitor C67, a second end of capacitor C70, a second end of capacitor C73, a second end of capacitor C46, ​​a second end of capacitor C49, a second end of capacitor C52, a second end of capacitor C55, a second end of resistor R50, a second end of resistor R56, and a second end of resistor R56 are connected to a power ground;

[0079] The model of the synchronous buck converter U10 is IS6605A.

[0080] The third power supply module includes:

[0081] The voltage input terminals VIN1 and VIN2 of the synchronous buck converter U2, the first terminal of the capacitor C84, the first terminal of the capacitor C85, the first terminal of the capacitor C86, the first terminal of the capacitor C87, and the first terminal of the capacitor C88 are connected to the power supply VCC12V, and the second terminals of the capacitor C84, the second terminal of the capacitor C85, the second terminal of the capacitor C86, the second terminal of the capacitor C87, and the second terminal of the capacitor C88 are connected to the power supply ground.

[0082] An internal power supply terminal VCC of the synchronous buck converter U2 is connected to a first end of a capacitor C90, a first end of a resistor R84, a first end of a resistor R83, a phase address setting terminal ADDPH of the synchronous buck converter U2, and a first end of a resistor R85, a second end of the resistor R85 is connected to a power ground, and a second end of the capacitor C90 and a ground terminal AGND of the synchronous buck converter U2 are connected to a power ground;

[0083] The driving power supply terminal VDRV of the synchronous buck converter U2 is connected to the second end of the resistor R84 and the first end of the capacitor C89. The second end of the capacitor C89 is connected to the power ground.

[0084] The power good indication terminal PG of the open drain output of the synchronous buck converter U2 is connected to the second end of the resistor R83.

[0085] The clock terminal SCL of the synchronous buck converter U2 is connected to the first terminal of the resistor R247.

[0086] The data terminal SDA of the synchronous buck converter U2 is connected to the first terminal of the resistor R248.

[0087] The alarm terminal ALT of the synchronous buck converter U2 is connected to the first terminal of the resistor R249.

[0088] The second end of the resistor R247, the second end of the resistor R248, and the second end of the resistor R249 are connected to the power supply VCC3.3V;

[0089] The enable terminal EN of the synchronous buck converter U2 is connected to the first terminal of the resistor R82, and the second terminal of the resistor R82 is connected to the power ground.

[0090] The bootstrap connection terminal BST of the synchronous buck converter U2 is connected to the first end of the resistor R86, the second end of the resistor R86 is connected to the first end of the capacitor C92, the switch output terminals SW1 and SW2 of the synchronous buck converter U2 are connected to the second end of the capacitor C92, the first end of the resistor R90, and the first end of the inductor L7, the second end of the inductor L7 outputs the power supply VDD0V9, and is connected to the first end of the resistor R94, the first end of the capacitor C94, the first end of the capacitor C95, the first end of the capacitor C96, the first end of the capacitor C97, the first end of the capacitor C98, the first end of the capacitor C99, and the first end of the capacitor C100, wherein the inductor L7 is used as an energy storage inductor of the DCDC power supply, and cooperates with the MOS tube inside the DCDC chip to complete the voltage conversion;

[0091] The remote sensing return terminal VFB of the synchronous buck converter U2 is connected to the first end of the resistor R87, the first end of the resistor R91, and the first end of the resistor R92. The second end of the resistor R91 is connected to the first end of the capacitor C93. The second end of the capacitor C93 is connected to the second end of the resistor R94 and the second end of the resistor R92.

[0092] The output remote sensing feedback terminal RGND of the synchronous buck converter U2 is connected to the second end of the resistor R87 and the first end of the resistor R95, and the second end of the resistor R95, the second end of the capacitor C94, the second end of the capacitor C95, the second end of the capacitor C96, the second end of the capacitor C97, the second end of the capacitor C98, the second end of the capacitor C99, and the second end of the capacitor C100 are connected to the power ground;

[0093] The phase shear terminal PS# of the synchronous buck converter U2 is connected to the first terminal of the capacitor R88, and the second terminal of the capacitor R88 is connected to the internal power supply terminal VCC of the synchronous buck converter U2;

[0094] The reference current setting terminal ISET of the synchronous buck converter U2 is connected to the first end of the resistor R93, the second end of the resistor R93 is connected to the power ground, the PMBus address setting terminal ADDR of the synchronous buck converter U2 is connected to the first end of the resistor R89, and the second end of the resistor R89 ​​is connected to the power ground.

[0095] The model of the synchronous buck converter U2 is IS6608A.

[0096] The third power supply module also includes:

[0097] The first end of capacitor C343, the first end of capacitor C344, the first end of capacitor C345, and the power input terminal VIN of the synchronous buck converter U7 are connected to the power supply VCC12V, the enable terminal EN of the synchronous buck converter U7 is connected to the first end of the resistor R45, the internal power supply terminal VCC of the synchronous buck converter U7 is connected to the first end of the capacitor C346, the mode selection terminal MODE of the synchronous buck converter U7 is connected to the first end of the resistor R49, the chip select terminal CS of the synchronous buck converter U7 is connected to the first end of the resistor R72, the bootstrap power supply terminal BST of the synchronous buck converter U7 is connected to the first end of the resistor R81, the second end of the resistor R81 is connected to the first end of the capacitor C347, the second end of the capacitor C347 is connected to the power switch terminals SW1 and SW2 of the synchronous buck converter U7, and the first end of the inductor L11, the second end of the inductor L11 outputs the voltage VP_09_ADJ, and is connected to the first end of the capacitor C349, the first end of the resistor R206, and the capacitor C350 the first end of the synchronous buck converter U7, the first end of the capacitor C351, and the first end of the capacitor C352 are connected; the second end of the capacitor C349 is connected to the first end of the resistor R204, the second end of the resistor R204 is connected to the feedback end FB of the synchronous buck converter U7, the second end of the resistor R206, and the first end of the resistor R207, the state indication end PGOOD of the synchronous buck converter U7 is connected to the first end of the resistor R205, the second end of the resistor R205 is connected to the power supply VCC3.3V, the reference end REF of the synchronous buck converter U7 is connected to the first end of the capacitor C348, the ground ends AGND, PGND1, and PGND2 of the synchronous buck converter U7, the second end of the capacitor C348, the second end of the resistor R207, the second end of the capacitor C350, the second end of the capacitor C351, the second end of the capacitor C352, the second end of the capacitor C343, the second end of the capacitor C344, the second end of the capacitor C345, the second end of the capacitor C346, and the second end of the resistor R45 are connected to the power ground. The model of synchronous buck converter U7 is IS6605A.

[0098] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A DSP chip power supply circuit, characterized in that: It includes a first power supply module that provides power VCC1V8_DSP, a second power supply module that provides power VCC1V5 DSP, and a third power supply module that provides power VDD0V9, wherein the first power supply module supplies power to the DSP chip and the first peripheral circuit of the DSP chip; the second power supply module supplies power to the DSP chip and the second peripheral circuit of the DSP chip; the third power supply module supplies power to the DSP chip, the second peripheral circuit of the DSP chip, and the third peripheral circuit of the DSP chip; The first peripheral circuit, the second peripheral circuit and the third peripheral circuit include circuits in which a plurality of capacitors are connected in parallel.

2. A DSP chip power supply circuit according to claim 1, characterized in that: The first peripheral circuit also includes: a first end of capacitor C185, a first end of capacitor C192, a first end of capacitor C197, and an input end of capacitor C208 are connected to a voltage regulating end of the DSP chip; a second end of capacitor C185, a second end of capacitor C192, and a second end of capacitor C197 are connected to a power ground; The first end of capacitor C181, the first end of capacitor C188, the first end of capacitor C193, and the input end of capacitor C205 are connected to the voltage regulating end of the DSP chip; the second end of capacitor C181, the second end of capacitor C188, and the second end of capacitor C193 are connected to the power ground; The first end of capacitor C181, the first end of capacitor C188, the first end of capacitor C193, and the input end of capacitor C205 are connected to the PLL circuit power supply end of the DSP chip; the second end of capacitor C181, the second end of capacitor C188, and the second end of capacitor C193 are connected to the power ground; The first end of capacitor C182, the first end of capacitor C189, the first end of capacitor C194, the first end of capacitor C200, and the input end of capacitor C206 are connected to the PLL circuit power supply end of the DSP chip; the second end of capacitor C182, the second end of capacitor C189, the second end of capacitor C194, and the second end of capacitor C200 are connected to the power ground; The output end of capacitor C208, the output end of capacitor C205, the output end of capacitor C206, the first end of capacitor C216, the first end of capacitor C219 are connected to the power supply VCC1V8 DSP; the second end of capacitor C216, the second end of capacitor C219 are connected to the power supply VCC1V8 DSP.

3. A DSP chip power supply circuit according to claim 1, characterized in that: The second peripheral circuit also includes: The first end of capacitor C155, the first end of capacitor C164, the first end of capacitor C173, and the input end of capacitor C177 are connected to the first power supply end of the transmitting module of the DSP chip; the second end of capacitor C155, the second end of capacitor C164, and the second end of capacitor C173 are connected to the power ground; the output end of capacitor C177 is connected to the power supply VCC1V5_DSP; The first end of capacitor C157, the first end of capacitor C166, the first end of capacitor C174, and the input end of capacitor C178 are connected to the second power supply end of the transmitter module of the DSP chip; the second end of capacitor C157, the second end of capacitor C166, and the second end of capacitor C174 are connected to the power ground; the output end of capacitor C178 is connected to the power supply VCC1V5_DSP; The first end of capacitor C158, the first end of capacitor C169, the first end of capacitor C175, and the input end of capacitor C179 are connected to the power supply end of the DSP chip phase-locked loop; the second end of capacitor C158, the second end of capacitor C169, and the second end of capacitor C175 are connected to the power ground; the output end of capacitor C179 and the first end of capacitor C180 are connected to the power supply VDD0V9; the second end of capacitor C180 is connected to the power ground; The first end of capacitor C202, the first end of capacitor C210, the first end of capacitor C214, and the input end of capacitor C217 are connected to the third power supply end of the transmitter module of the DSP chip; the second end of capacitor C202, the second end of capacitor C210, and the second end of capacitor C214 are connected to the power ground; the output end of capacitor C217 is connected to the power supply VCC1V5 DSP; The first end of capacitor C203, the first end of capacitor C211, the first end of capacitor C215, and the input end of capacitor C218 are connected to the second power supply end of the transmitting module of the DSP chip; the second end of capacitor C203, the second end of capacitor C211, and the second end of capacitor C215 are connected to the power ground; the output end of capacitor C218 is connected to the power supply VCC1V5_DSP.

4. A DSP chip power supply circuit according to claim 2 or 3, characterized in that: Among them, capacitor C208, capacitor C205, capacitor C206, capacitor C177, capacitor C178, capacitor C179, capacitor C217, and capacitor C218 are through-hole capacitors.

5. A DSP chip power supply circuit according to claim 4, characterized in that: The model of the feedthrough capacitor is NFM21CC221R1H3.

6. A DSP chip power supply circuit according to claim 1, characterized in that: The first power supply module includes: a first end of a capacitor C44, a first end of a capacitor C47, a first end of a capacitor C50, a power input end VIN of a synchronous buck converter U8 connected to a power supply VCC12V, an enable end EN of the synchronous buck converter U8 connected to a first end of a resistor R50, an internal power supply end VCC of the synchronous buck converter U8 connected to a first end of a capacitor C46, ​​a mode selection end MODE of the synchronous buck converter U8 connected to a first end of a resistor R51, a chip select end CS of the synchronous buck converter U8 connected to a first end of a resistor R52, and a first end of a first resistor R53. The bootstrap power supply terminal BST of the converter U8 is connected to the first end of the resistor R57, the second end of the resistor R57 is connected to the first end of the capacitor C56, the second end of the capacitor C56 is connected to the power switch terminals SW1 and SW2 of the synchronous buck converter U8, and the first end of the inductor L3, the second end of the inductor L3 outputs the power supply VCC1.8V, and is connected to the first end of the capacitor C349, the first end of the resistor R66, the first end of the capacitor C65, the first end of the capacitor C68, the first end of the capacitor C71, and the first end of the resistor R210; the second end of the resistor R210 outputs the power supply VCC1V8 DSP; the second end of capacitor C349 is connected to the first end of resistor R60, the second end of resistor R60 is connected to the feedback end FB of synchronous buck converter U8, the second end of resistor R66, and the first end of resistor R67, the state indication end PGOOD of synchronous buck converter U8 is connected to the first end of resistor R65, the second end of resistor R65 is connected to the power supply VCC3.3V, the reference end REF of synchronous buck converter U8 is connected to the first end of capacitor C59, the ground ends AGND, PGND1, and PGND2 of synchronous buck converter U8, the second end of capacitor C59, the second end of resistor R67, the second end of capacitor C65, the second end of capacitor C68, the second end of capacitor C71, the second end of capacitor C44, the second end of capacitor C47, the second end of capacitor C50, the second end of capacitor C46, ​​the second end of resistor R50, the second end of resistor R55, and the second end of resistor R52 are connected to the power ground.

7. A DSP chip power supply circuit according to claim 1, characterized in that: The second power supply module includes: The first end of capacitor C46, ​​the first end of capacitor C49, the first end of capacitor C52, and the power input terminal VIN of the synchronous buck converter U10 are connected to the power supply VCC12V, the enable terminal EN of the synchronous buck converter U10 is connected to the first end of the resistor R50, the internal power supply terminal VCC of the synchronous buck converter U10 is connected to the first end of the capacitor C55, the mode selection terminal MODE of the synchronous buck converter U10 is connected to the first end of the resistor R55, the chip select terminal CS of the synchronous buck converter U10 is connected to the first end of the resistor R56, the bootstrap power supply terminal BST of the synchronous buck converter U10 is connected to the first end of the resistor R59, the second end of the resistor R59 is connected to the first end of the capacitor C58, the second end of the capacitor C58 is connected to the power switch terminals SW1 and SW2 of the synchronous buck converter U10, and the first end of the inductor L5, the second end of the inductor L5 outputs the power supply VCC1V5_DSP, and is connected to the first end of the capacitor C349, the first end of the resistor R70, and the first end of the capacitor C67 , a first end of capacitor C70, and a first end of capacitor C73 are connected; a second end of capacitor C349 is connected to a first end of resistor R62, a second end of resistor R62 is connected to a feedback end FB of the synchronous buck converter U10, a second end of resistor R70, and a first end of resistor R71, a state indication end PGOOD of the synchronous buck converter U10 is connected to a first end of resistor R65, a second end of resistor R65 is connected to a power supply VCC3.3V, a reference end REF of the synchronous buck converter U10 is connected to a first end of capacitor C61, and ground ends AGND, PGND1, and PGND2 of the synchronous buck converter U10, a second end of capacitor C61, a second end of resistor R71, a second end of capacitor C67, a second end of capacitor C70, a second end of capacitor C73, a second end of capacitor C46, ​​a second end of capacitor C49, a second end of capacitor C52, a second end of capacitor C55, a second end of resistor R50, a second end of resistor R56, and a second end of resistor R56 are connected to a power ground.

8. A DSP chip power supply circuit according to claim 6 or 7, characterized in that: The models of the synchronous buck converter U8 and the synchronous buck converter U10 are IS6605A.

9. A DSP chip power supply circuit according to claim 1, characterized in that: The third power supply module comprises: The voltage input terminals VIN1 and VIN2 of the synchronous buck converter U2, the first terminal of the capacitor C84, the first terminal of the capacitor C85, the first terminal of the capacitor C86, the first terminal of the capacitor C87, and the first terminal of the capacitor C88 are connected to the power supply VCC12V, and the second terminals of the capacitor C84, the second terminal of the capacitor C85, the second terminal of the capacitor C86, the second terminal of the capacitor C87, and the second terminal of the capacitor C88 are connected to the power supply ground. An internal power supply terminal VCC of the synchronous buck converter U2 is connected to a first end of a capacitor C90, a first end of a resistor R84, a first end of a resistor R83, a phase address setting terminal ADDPH of the synchronous buck converter U2, and a first end of a resistor R85, a second end of the resistor R85 is connected to a power ground, and a second end of the capacitor C90 and a ground terminal AGND of the synchronous buck converter U2 are connected to a power ground; The driving power supply terminal VDRV of the synchronous buck converter U2 is connected to the second end of the resistor R84 and the first end of the capacitor C89. The second end of the capacitor C89 is connected to the power ground. The power good indication terminal PG of the open drain output of the synchronous buck converter U2 is connected to the second end of the resistor R83. The clock terminal SCL of the synchronous buck converter U2 is connected to the first terminal of the resistor R247. The data terminal SDA of the synchronous buck converter U2 is connected to the first terminal of the resistor R248. The alarm terminal ALT of the synchronous buck converter U2 is connected to the first terminal of the resistor R249. The second end of the resistor R247, the second end of the resistor R248, and the second end of the resistor R249 are connected to the power supply VCC3.3V; The enable terminal EN of the synchronous buck converter U2 is connected to the first terminal of the resistor R82, and the second terminal of the resistor R82 is connected to the power ground. The bootstrap connection terminal BST of the synchronous buck converter U2 is connected to the first end of the resistor R86, the second end of the resistor R86 is connected to the first end of the capacitor C92, the switch output terminals SW1 and SW2 of the synchronous buck converter U2 are connected to the second end of the capacitor C92, the first end of the resistor R90, and the first end of the inductor L7, the second end of the inductor L7 outputs the power supply VDD0V9, and is connected to the first end of the resistor R94, the first end of the capacitor C94, the first end of the capacitor C95, the first end of the capacitor C96, the first end of the capacitor C97, the first end of the capacitor C98, the first end of the capacitor C99, and the first end of the capacitor C100, the remote sensing return terminal VFB of the synchronous buck converter U2 is connected to the first end of the resistor R87, the first end of the resistor R91, and the first end of the resistor R92, the second end of the resistor R91 is connected to the first end of the capacitor C93, the second end of the capacitor C93 is connected to the second end of the resistor R94 and the second end of the resistor R92, and the first end of the capacitor C100 is connected to the remote sensing return terminal VFB of the synchronous buck converter U2 The output remote sensing feedback terminal RGND of the synchronous buck converter U2 is connected to the second end of the resistor R87 and the first end of the resistor R95, and the second end of the resistor R95, the second end of the capacitor C94, the second end of the capacitor C95, the second end of the capacitor C96, the second end of the capacitor C97, the second end of the capacitor C98, the second end of the capacitor C99, and the second end of the capacitor C100 are connected to the power ground; The phase shear terminal PS# of the synchronous buck converter U2 is connected to the first terminal of the capacitor R88, and the second terminal of the capacitor R88 is connected to the internal power supply terminal VCC of the synchronous buck converter U2; The reference current setting terminal ISET of the synchronous buck converter U2 is connected to the first end of the resistor R93, the second end of the resistor R93 is connected to the power ground, the PMBus address setting terminal ADDR of the synchronous buck converter U2 is connected to the first end of the resistor R89, and the second end of the resistor R89 ​​is connected to the power ground.

10. A DSP chip power supply circuit according to claim 1, characterized in that: The third power supply module also includes: The first end of capacitor C343, the first end of capacitor C344, the first end of capacitor C345, and the power input terminal VIN of the synchronous buck converter U7 are connected to the power supply VCC12V, the enable terminal EN of the synchronous buck converter U7 is connected to the first end of the resistor R45, the internal power supply terminal VCC of the synchronous buck converter U7 is connected to the first end of the capacitor C346, the mode selection terminal MODE of the synchronous buck converter U7 is connected to the first end of the resistor R49, the chip select terminal CS of the synchronous buck converter U7 is connected to the first end of the resistor R72, the bootstrap power supply terminal BST of the synchronous buck converter U7 is connected to the first end of the resistor R81, the second end of the resistor R81 is connected to the first end of the capacitor C347, the second end of the capacitor C347 is connected to the power switch terminals SW1 and SW2 of the synchronous buck converter U7, and the first end of the inductor L11, and the second end of the inductor L11 outputs the voltage VP 09ADJ, and is connected to the first end of capacitor C349, the first end of resistor R206, the first end of capacitor C350, the first end of capacitor C351, and the first end of capacitor C352; the second end of capacitor C349 is connected to the first end of resistor R204, the second end of resistor R204 is connected to the feedback end FB of synchronous buck converter U7, the second end of resistor R206, and the first end of resistor R207, the state indication end PGOOD of synchronous buck converter U7 is connected to the first end of resistor R205, the second end of resistor R205 is connected to the feedback end FB of synchronous buck converter U7, the second end of resistor R206, and the first end of resistor R207, the state indication end PGOOD of synchronous buck converter U7 is connected to the first end of resistor R205, and the second end of resistor R205 is connected to the feedback end FB of synchronous buck converter U7. The source VCC is connected to 3.3V, the reference terminal REF of the synchronous buck converter U7 is connected to the first end of the capacitor C348, the ground terminals AGND, PGND1, PGND2 of the synchronous buck converter U7, the second end of the capacitor C348, the second end of the resistor R207, the second end of the capacitor C350, the second end of the capacitor C351, the second end of the capacitor C352, the second end of the capacitor C343, the second end of the capacitor C344, the second end of the capacitor C345, the second end of the capacitor C346, and the second end of the resistor R45 are connected to the power ground.

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