Rapid power-on device for internal circuit of chip and working method of rapid power-on device

Abstract

The embodiment of the invention provides a rapid power-on device for a chip internal circuit and a working method of the rapid power-on device. The method is applied to integrated circuits. The device comprises a charging branch and a rapid power-on branch. Wherein the charging branch comprises a transistor PM1, a transistor PM2, a capacitor C1 and a resistor R1; the fast power-on branch comprises a transistor PM3, a transistor PM4, a transistor PM5, a comparator Comp1 and a resistor R2; in a power-on initial and charging branch, after first current sequentially passes through a transistor PM1 and a transistor PM2, one part of the first current flows to a capacitor C1 to charge the capacitor C1, and the other part of the first current flows to a resistor R1, so that voltage input by a positive input port of a comparator Comp1 is generated through the resistor R1; in the fast power-on branch, second current sequentially passes through a transistor PM4, a transistor PM5 and a resistor R2, so that voltage input by a negative input port of a comparator Comp1 is generated through the resistor R2; when the voltage input by the positive input port is lower than the voltage input by the negative input port, the transistor PM3 is conducted, and third current flows to the capacitor C1 through the transistor PM3 to charge the capacitor C1; when the voltage input by the positive input port is higher than the voltage input by the negative input port, the transistor PM3 is switched off, and the quick power-on branch stops working; wherein the first current, the second current and the third current are respectively provided by a power supply VDD. In this way, the internal circuit of the chip of the low-power-consumption circuit can be quickly powered on, and the power-on time requirement of most systems is met.

Description

Technical Field

[0001] The present disclosure relates to the field of integrated circuits, and in particular to a fast power-on device for a circuit inside a chip and a working method thereof. Background Art

[0002] In many applications, the system is required to start quickly. The fast startup of the system depends on the internal circuit of the chip, and power consumption is an important indicator in chip design. Generally, power consumption is reduced by reducing branch current. Capacitors are commonly used components in circuit design and are widely used in filtering, isolation, and noise processing. In circuit design, sometimes capacitors with larger capacitance are needed according to functional requirements, especially low-power circuits are increasingly widely used, but larger capacitors take a long time to establish the target potential, which affects the cold start performance of the chip circuit. Therefore, it is very necessary to study devices and methods for quickly powering on the internal circuit of the chip by shortening the time it takes for large capacitors to establish the target potential. Summary of the invention

[0003] The present disclosure provides a fast power-on device for a chip internal circuit and a working method thereof.

[0004] According to a first aspect of the present disclosure, a device for quickly powering on a circuit inside a chip is provided. The device comprises:

[0005] Charging branch and fast power-on branch; among them,

[0006] The charging branch includes a transistor PM1, a transistor PM2, a capacitor C1 and a resistor R1;

[0007] The fast power-on branch includes a transistor PM3, a transistor PM4, a transistor PM5, a comparator Comp1 and a resistor R2;

[0008] At the beginning of power-on, in the charging branch, after the first current passes through the transistor PM1 and the transistor PM2 in sequence, a part of it flows to the capacitor C1 to charge the capacitor C1, and the other part flows to the resistor R1 to generate the voltage input to the positive input port of the comparator Comp1 through the resistor R1;

[0009] In the fast power-on branch, the second current passes through transistor PM4, transistor PM5 and resistor R2 in sequence, so as to generate the voltage input to the negative input port of comparator Comp1 through resistor R2; when the voltage input to the positive input port is lower than the voltage input to the negative input port, transistor PM3 is turned on, and the third current flows to capacitor C1 through transistor PM3 to charge capacitor C1; when the voltage input to the positive input port is higher than the voltage input to the negative input port, transistor PM3 is turned off, and the fast power-on branch stops working; wherein the first current, the second current, and the third current are respectively provided by the power supply VDD.

[0010] In some implementations of the first aspect, the charging branches are connected in the following manner:

[0011] The source of the transistor PM1 is connected to the power supply VDD, the gate is connected to the first control potential port VB1, and the drain is connected to the source of the transistor PM2;

[0012] The gate of the transistor PM2 is connected to the second control potential port VB2, and the drain is connected to one end of the resistor R1 and one end of the capacitor C1 respectively;

[0013] The other end of the resistor R1 and the other end of the capacitor C1 are grounded respectively.

[0014] In some implementations of the first aspect, the fast power-on branch is connected in the following manner:

[0015] The sources of the transistor PM3 and the transistor PM4 are respectively connected to the power supply VDD, the gate of the transistor PM3 is connected to the output port of the comparator Comp1, and the drain is respectively connected to one end of the capacitor C1 and the positive input port of the comparator Comp1;

[0016] The gate of the transistor PM4 is connected to the first control potential port VB1, and the drain is connected to the source of the transistor PM5;

[0017] The gate of the transistor PM5 is connected to the second control potential port VB2, and the drain is respectively connected to one end of the resistor R2 and the negative input port of the comparator Comp1;

[0018] The other end of the resistor R2 is grounded.

[0019] In some implementations of the first aspect,

[0020] The transistor PM1 has the same size as the transistor PM4;

[0021] The transistor PM2 and the transistor PM5 have the same size;

[0022] The resistance value of the resistor R1 is greater than the resistance value of the resistor R2.

[0023] In some implementations of the first aspect, the transistors PM1 , PM2 , PM3 , PM4 , and PM5 are turned on when the voltage inputted at the gate is at a low level.

[0024] According to a second aspect of the present disclosure, a method for quickly powering on a chip internal circuit is provided. The method comprises:

[0025] The control voltages of the first control potential port VB1 and the second control potential port VB2 are both set to a low level, and the transistors PM1, PM2, PM4 and PM5 are turned on;

[0026] After the first current passes through transistor PM1 and transistor PM2 in sequence, a part of the current charges capacitor C1, and the other part of the current passes through resistor R1 to generate a voltage input to the positive input port of comparator Comp1; the second current passes through transistor PM4, transistor PM5 and resistor R2 in sequence, and generates a voltage input to the negative input port of comparator Comp1 through resistor R2;

[0027] At the beginning of power-on, the voltage input to the positive input port is lower than the voltage input to the negative input port, the voltage output from the output port of the comparator Comp1 is low, the transistor PM3 is turned on, and the third current charges the capacitor C1 through the transistor PM3; as the power-on time passes, the voltage input to the positive input port is higher than the voltage input to the negative input port, the voltage output from the output port of the comparator Comp1 is high, the transistor PM3 is turned off, and the fast power-on branch stops working.

[0028] In some implementations of the second aspect, the current values ​​of the first current, the second current, and the third current are positively correlated with the channel width-to-length ratio of the corresponding transistor; wherein,

[0029] The current value of the first current is equal to the current value of the second current.

[0030] In the present disclosure, the device includes a charging branch and a fast power-on branch; wherein the charging branch includes a transistor PM1, a transistor PM2, a capacitor C1 and a resistor R1; the fast power-on branch includes a transistor PM3, a transistor PM4, a transistor PM5, a comparator Comp1 and a resistor R2; at the beginning of power-on, in the charging branch, after the first current passes through the transistor PM1 and the transistor PM2 in sequence, a part of the first current flows to the capacitor C1 to charge the capacitor C1, and the other part flows to the resistor R1 so as to generate a voltage input to the positive input port of the comparator Comp1 through the ... In the power-on branch, the second current passes through transistor PM4, transistor PM5 and resistor R2 in sequence, so as to generate the voltage input to the negative input port of comparator Comp1 through resistor R2; when the voltage input to the positive input port is lower than the voltage input to the negative input port, transistor PM3 is turned on, and the third current flows to capacitor C1 through transistor PM3 to charge capacitor C1; when the voltage input to the positive input port is higher than the voltage input to the negative input port, transistor PM3 is turned off, and the fast power-on branch stops working; wherein the first current, the second current, and the third current are respectively provided by the power supply VDD. In this way, the internal circuit of the chip of the low-power circuit can be powered on quickly, and the power-on time requirements of most systems can be met.

[0031] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, among which:

[0033] Figure 1 A structural diagram of a device for quickly powering on a chip internal circuit provided by an embodiment of the present disclosure is shown;

[0034] Figure 2 A simulation comparison diagram of a chip internal circuit with and without a fast power-on device provided by an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0036] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In response to the problems in the background technology, the embodiments of the present disclosure provide a fast power-on device for the internal circuit of a chip and a working method thereof. Specifically, the device includes a charging branch and a fast power-on branch; wherein the charging branch includes a transistor PM1, a transistor PM2, a capacitor C1 and a resistor R1; the fast power-on branch includes a transistor PM3, a transistor PM4, a transistor PM5, a comparator Comp1 and a resistor R2; at the beginning of power-on, in the charging branch, after the first current passes through the transistor PM1 and the transistor PM2 in sequence, a part of it flows to the capacitor C1 to charge the capacitor C1, and the other part flows to the resistor R1, so as to generate a voltage input to the positive input port of the comparator Comp1 through the resistor R1; the fast power-on In the branch, the second current passes through transistor PM4, transistor PM5 and resistor R2 in sequence, so as to generate the voltage input to the negative input port of comparator Comp1 through resistor R2; when the voltage input to the positive input port is lower than the voltage input to the negative input port, transistor PM3 is turned on, and the third current flows to capacitor C1 through transistor PM3 to charge capacitor C1; when the voltage input to the positive input port is higher than the voltage input to the negative input port, transistor PM3 is turned off, and the fast power-on branch stops working; wherein the first current, the second current, and the third current are respectively provided by the power supply VDD. In this way, the internal circuit of the chip of the low-power circuit can be powered on quickly, and the power-on time requirements of most systems can be met.

[0038] The device for quickly powering on a chip internal circuit and its working method provided by the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings through specific embodiments.

[0039] Figure 1 The structure diagram of a device for quickly powering on a chip internal circuit provided by an embodiment of the present disclosure is shown, and the device includes:

[0040] Charging branch and fast power-on branch; among them,

[0041] The charging branch includes a transistor PM1, a transistor PM2, a capacitor C1 and a resistor R1;

[0042] The fast power-on branch includes a transistor PM3, a transistor PM4, a transistor PM5, a comparator Comp1 and a resistor R2;

[0043] At the beginning of power-on, in the charging branch, after the first current passes through the transistor PM1 and the transistor PM2 in sequence, a part of it flows to the capacitor C1 to charge the capacitor C1, and the other part flows to the resistor R1 to generate the voltage input to the positive input port of the comparator Comp1 through the resistor R1;

[0044] In the fast power-on branch, the second current passes through transistor PM4, transistor PM5 and resistor R2 in sequence, so as to generate the voltage input to the negative input port of comparator Comp1 through resistor R2; when the voltage input to the positive input port is lower than the voltage input to the negative input port, transistor PM3 is turned on, and the third current flows to capacitor C1 through transistor PM3 to charge capacitor C1; when the voltage input to the positive input port is higher than the voltage input to the negative input port, transistor PM3 is turned off, and the fast power-on branch stops working; wherein the first current, the second current, and the third current are respectively provided by the power supply VDD.

[0045] In some embodiments, the charging branches are connected in the following manner:

[0046] The source of the transistor PM1 is connected to the power supply VDD, the gate is connected to the first control potential port VB1, and the drain is connected to the source of the transistor PM2;

[0047] The gate of the transistor PM2 is connected to the second control potential port VB2, and the drain is connected to one end of the resistor R1 and one end of the capacitor C1 respectively;

[0048] The other end of the resistor R1 and the other end of the capacitor C1 are grounded respectively.

[0049] In some embodiments, the fast power-up branch is connected in the following manner:

[0050] The sources of the transistor PM3 and the transistor PM4 are respectively connected to the power supply VDD, the gate of the transistor PM3 is connected to the output port of the comparator Comp1, and the drain is respectively connected to one end of the capacitor C1 and the positive input port of the comparator Comp1;

[0051] The gate of the transistor PM4 is connected to the first control potential port VB1, and the drain is connected to the source of the transistor PM5;

[0052] The gate of the transistor PM5 is connected to the second control potential port VB2, and the drain is respectively connected to one end of the resistor R2 and the negative input port of the comparator Comp1;

[0053] The other end of the resistor R2 is grounded.

[0054] In some embodiments, the voltage input to the positive input port Vinp of the comparator Comp1 is represented by VA;

[0055] The voltage input to the negative input port Vinn of the comparator Comp1 is represented by VB;

[0056] The output port of the comparator Comp1 is denoted by Vout.

[0057] In some embodiments, the transistor PM1 has the same size as the transistor PM4;

[0058] The transistor PM2 and the transistor PM5 have the same size;

[0059] The resistance value of the resistor R1 is greater than the resistance value of the resistor R2.

[0060] In some embodiments, the transistors PM1 , PM2 , PM3 , PM4 , and PM5 are turned on when the voltage inputted at the gate is at a low level.

[0061] In some embodiments, when the voltage input to the positive input port Vinp of the comparator Comp1 is greater than the voltage input to the negative input port Vinn of the comparator Comp1 , the output port of the comparator Comp1 outputs a high level, otherwise it outputs a low level.

[0062] Furthermore, the working method of the device is as follows:

[0063] The control voltages of the first control potential port VB1 and the second control potential port VB2 are both set to a low level, and the transistors PM1, PM2, PM4 and PM5 are turned on;

[0064] After the first current passes through transistor PM1 and transistor PM2 in sequence, a part of the current charges capacitor C1, and the other part of the current passes through resistor R1 to generate a voltage input to the positive input port of comparator Comp1; the second current passes through transistor PM4, transistor PM5 and resistor R2 in sequence, and generates a voltage input to the negative input port of comparator Comp1 through resistor R2;

[0065] At the beginning of power-on, the voltage input to the positive input port is lower than the voltage input to the negative input port, the voltage output from the output port of the comparator Comp1 is low, the transistor PM3 is turned on, and the third current charges the capacitor C1 through the transistor PM3; as the power-on time passes, the voltage input to the positive input port is higher than the voltage input to the negative input port, the voltage output from the output port of the comparator Comp1 is high, the transistor PM3 is turned off, and the fast power-on branch stops working.

[0066] In some embodiments, the current values ​​of the first current, the second current, and the third current are positively correlated with the channel width-to-length ratio of the corresponding transistor; wherein,

[0067] The current value of the first current is equal to the current value of the second current.

[0068] Figure 2 The figure shows a simulation comparison diagram of a chip internal circuit with and without a fast power-on device provided by an embodiment of the present disclosure. Figure 2As shown, the horizontal axis represents the charging time in seconds, the vertical axis represents the capacitor voltage in v, the solid line represents the simulation curve when there is no fast power-on device in the internal circuit of the chip, and the dotted line represents the simulation curve when there is a fast power-on device in the internal circuit of the chip.

[0069] When there is no fast power-on device in the internal circuit of the chip, the first current flowing through the transistor PM1 and the transistor PM2 is very small. At the beginning of power-on, the transistor PM1 and the transistor PM2 are turned on, and part of the first current flows to the resistor R1, and the other part of the current flows to the capacitor C1 to charge the capacitor. Since the first current is small and the capacitance value of the capacitor C1 is large, the charging time will last for a long time; Figure 2 It can be seen from the solid line in that when the first current is 2uA and the capacitance value of capacitor C1 is 1uf, the simulated power-on time is 1.5s, which is far from meeting the requirement of most systems for fast startup.

[0070] When there is a fast power-on device in the internal circuit of the chip, transistors PM1, PM2, PM4 and PM5 are turned on. At the beginning of power-on, the voltage at the negative input port of the comparator Comp1 will quickly rise to the target potential due to the small parasitic resistance, while the voltage at the positive input port of the comparator Comp1 will have a slow voltage establishment time due to the large capacitance value of the capacitor C1. Therefore, for a considerable period of time, the voltage at the positive input port of the comparator Comp1 is lower than the voltage at the negative input port, so that the comparator Comp1 outputs a low level, and the transistor PM3 is turned on. The third current flowing through the transistor PM3 flows to the capacitor C1 to charge the capacitor. As the charging time increases, the voltage at the positive input port of the comparator Comp1 increases. When the voltage at the positive input port of the comparator Comp1 is higher than the voltage at the negative input port, the comparator Comp1 outputs a high level, and the transistor PM3 is disconnected, completing the fast charging. Figure 2 It can be seen from the dotted line in that when the first current is 2uA and the capacitance value of capacitor C1 is 1uf, the simulation results show that it only takes 2ms to reach 95% of the target voltage value. This power-on time is much shorter than the power-on time simulated without a fast power-on device, and the power-on time simulated after adding a fast power-on device can meet the requirements of most systems for fast startup.

[0071] According to an embodiment of the present disclosure, the device includes a charging branch and a fast power-on branch; wherein the charging branch includes a transistor PM1, a transistor PM2, a capacitor C1 and a resistor R1; the fast power-on branch includes a transistor PM3, a transistor PM4, a transistor PM5, a comparator Comp1 and a resistor R2; at the beginning of power-on, in the charging branch, after the first current passes through the transistor PM1 and the transistor PM2 in sequence, a part of the first current flows to the capacitor C1 to charge the capacitor C1, and the other part flows to the resistor R1 so as to generate a voltage input to the positive input port of the comparator Comp1 through the ... In the fast power-on branch, the second current passes through transistor PM4, transistor PM5 and resistor R2 in sequence, so as to generate the voltage input to the negative input port of comparator Comp1 through resistor R2; when the voltage input to the positive input port is lower than the voltage input to the negative input port, transistor PM3 is turned on, and the third current flows to capacitor C1 through transistor PM3 to charge capacitor C1; when the voltage input to the positive input port is higher than the voltage input to the negative input port, transistor PM3 is turned off, and the fast power-on branch stops working; wherein the first current, the second current, and the third current are respectively provided by the power supply VDD. In this way, the internal circuit of the chip of the low-power circuit can be powered on quickly, and the power-on time requirements of most systems can be met.

[0072] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should be aware that the present disclosure is not limited by the order of the actions described, because according to the present disclosure, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present disclosure.

[0073] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0074] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A device for quickly powering on a chip internal circuit, characterized in that: include: Charging branch and fast power-on branch; among them, The charging branch includes a transistor PM1, a transistor PM2, a capacitor C1 and a resistor R1; The fast power-on branch includes a transistor PM3, a transistor PM4, a transistor PM5, a comparator Comp1 and a resistor R2; At the beginning of power-on, in the charging branch, after the first current passes through the transistor PM1 and the transistor PM2 in sequence, a part of it flows to the capacitor C1 to charge the capacitor C1, and the other part flows to the resistor R1 to generate the voltage input to the positive input port of the comparator Comp1 through the resistor R1; In the fast power-on branch, the second current passes through transistor PM4, transistor PM5 and resistor R2 in sequence, so as to generate the voltage input to the negative input port of comparator Comp1 through resistor R2; when the voltage input to the positive input port is lower than the voltage input to the negative input port, transistor PM3 is turned on, and the third current flows to capacitor C1 through transistor PM3 to charge capacitor C1; when the voltage input to the positive input port is higher than the voltage input to the negative input port, transistor PM3 is turned off, and the fast power-on branch stops working; wherein the first current, the second current, and the third current are respectively provided by the power supply VDD.

2. The device according to claim 1, characterized in that The charging branches are connected in the following manner: The source of the transistor PM1 is connected to the power supply VDD, the gate is connected to the first control potential port VB1, and the drain is connected to the source of the transistor PM2; The gate of the transistor PM2 is connected to the second control potential port VB2, and the drain is connected to one end of the resistor R1 and one end of the capacitor C1 respectively; The other end of the resistor R1 and the other end of the capacitor C1 are grounded respectively.

3. The device according to claim 1, characterized in that The fast power-on branch is connected in the following manner: The sources of the transistor PM3 and the transistor PM4 are respectively connected to the power supply VDD, the gate of the transistor PM3 is connected to the output port of the comparator Comp1, and the drain is respectively connected to one end of the capacitor C1 and the positive input port of the comparator Comp1; The gate of the transistor PM4 is connected to the first control potential port VB1, and the drain is connected to the source of the transistor PM5; The gate of the transistor PM5 is connected to the second control potential port VB2, and the drain is respectively connected to one end of the resistor R2 and the negative input port of the comparator Comp1; The other end of the resistor R2 is grounded.

4. The device according to claim 1, characterized in that The transistor PM1 has the same size as the transistor PM4; The transistor PM2 and the transistor PM5 have the same size; The resistance value of the resistor R1 is greater than the resistance value of the resistor R2.

5. The device according to claim 1, characterized in that The transistor PM1, the transistor PM2, the transistor PM3, the transistor PM4 and the transistor PM5 are turned on when the voltage inputted at the gate is at a low level.

6. A working method for a fast power-on device for a chip internal circuit as claimed in any one of claims 1 to 5, characterized in that: The method comprises: The control voltages of the first control potential port VB1 and the second control potential port VB2 are both set to a low level, and the transistors PM1, PM2, PM4 and PM5 are turned on; After the first current passes through transistor PM1 and transistor PM2 in sequence, a part of the current charges capacitor C1, and the other part of the current passes through resistor R1 to generate a voltage input to the positive input port of comparator Comp1; the second current passes through transistor PM4, transistor PM5 and resistor R2 in sequence, and generates a voltage input to the negative input port of comparator Comp1 through resistor R2; At the beginning of power-on, the voltage input to the positive input port is lower than the voltage input to the negative input port, the voltage output from the output port of the comparator Comp1 is low, the transistor PM3 is turned on, and the third current charges the capacitor C1 through the transistor PM3; as the power-on time passes, the voltage input to the positive input port is higher than the voltage input to the negative input port, the voltage output from the output port of the comparator Comp1 is high, the transistor PM3 is turned off, and the fast power-on branch stops working.

7. The method according to claim 6, characterized in that The current values ​​of the first current, the second current, and the third current are positively correlated with the channel width-to-length ratio of the corresponding transistor; wherein, The current value of the first current is equal to the current value of the second current.

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