Band-gap reference circuit, chip and electronic equipment

Abstract

The utility model provides a band-gap reference circuit, a chip and electronic equipment, and belongs to the technical field of electronics. The band-gap reference circuit comprises a starting current generation module and a band-gap reference voltage generation module, the starting current generation module comprises a first current mirror unit and a current source unit, and a first mirror image branch of the first current mirror unit is connected with the first end of the band-gap reference voltage generation module. The current flowing through the first end of the band-gap reference voltage generation module comprises a set current generated by the current source unit or a mirror current of the set current; the first reference branch is connected with the second end of the band-gap reference voltage generation module, after the first reference branch is powered on, current flowing through the second end of the band-gap reference voltage generation module comprises negative feedback current, and current flowing through the first end of the band-gap reference voltage generation module further comprises mirror current of the negative feedback current. According to the band-gap reference circuit, the starting current generation module does not need to be disconnected after normal work, and extra power consumption can be reduced.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a bandgap reference circuit, a chip and an electronic device. Background Art

[0002] BGR (Bandgap Reference) is also called bandgap reference circuit. The output voltage of BGR changes little with the power supply voltage, process and temperature. Based on its unique advantages, this circuit is widely used in various systems (voltage regulators, analog / digital converters, data acquisition systems, digital / analog converters, microcontroller units MCU) to provide a stable reference voltage for the system.

[0003] When the bandgap reference circuit is working, there are usually two stable states, the zero current state and the normal working state. When the power is turned on, all active devices in the reference circuit can transmit zero current, and all active devices can remain in the off state indefinitely; in order to break the zero current state, a startup circuit is usually added to make the bandgap reference circuit work in a normal state.

[0004] In order to achieve reliable startup of the bandgap reference circuit, a bias state is usually applied when the circuit is started to make the circuit work. After the circuit is working, the bias state applied to the bandgap reference circuit is disconnected to avoid affecting the normal operation of the bandgap reference circuit. However, in some cases, the startup circuit may not be properly disconnected from the bandgap reference circuit, thereby affecting the normal operation of the bandgap reference circuit. In addition, after the startup circuit is disconnected from the bandgap reference circuit, additional power consumption may still exist. Utility Model Content

[0005] In order to solve the problems of the prior art, the embodiments of the present application provide a bandgap reference circuit, a chip and an electronic device, which do not need to disconnect the startup current generation module after normal operation and can reduce additional power consumption. The technical solution is as follows:

[0006] According to one aspect of the present application, a bandgap reference circuit is provided, the bandgap reference circuit comprising a startup current generating module and a bandgap reference voltage generating module, the startup current generating module comprising a first current mirror unit and a current source unit, the first current mirror unit comprising a first reference branch and a first mirror branch;

[0007] The first end of the first mirror branch is connected to the first end of the bandgap reference voltage generation module, and when powered on, the current flowing through the first end of the bandgap reference voltage generation module includes the set current generated by the current source unit or the mirror current of the set current;

[0008] The first end of the first reference branch is connected to the second end of the bandgap reference voltage generating module. After power-on, the current flowing through the second end of the bandgap reference voltage generating module includes the negative feedback current generated by the bandgap reference voltage generating module, and the current flowing through the first end of the bandgap reference voltage generating module also includes a mirror current of the negative feedback current.

[0009] According to another aspect of the present application, a chip is provided, comprising the above-mentioned bandgap reference circuit.

[0010] According to another aspect of the present application, an electronic device is provided, comprising the above-mentioned bandgap reference circuit.

[0011] In the present application, the bandgap reference circuit may include a startup current generating module and a bandgap reference voltage generating module, the startup current generating module may include a first current mirror unit and a current source unit, and the first current mirror unit may include a first reference branch and a first mirror branch. When powered on, the set current or the mirror current of the set current generated by the current source unit is injected into the bandgap reference voltage generating module through the startup current generating module, so that the bandgap reference circuit can be efficiently started. Moreover, after the circuit works stably, the startup current generating module can continue to be in the path without being disconnected, thereby avoiding the problem of failure to disconnect normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Further details, features and advantages of the present application are disclosed in the following description of exemplary embodiments in conjunction with the accompanying drawings, in which:

[0013] Figure 1 A schematic diagram of a bandgap reference circuit provided according to an exemplary embodiment of the present application is shown;

[0014] Figure 2 A schematic diagram of a first starting current generating module provided according to an exemplary embodiment of the present application is shown;

[0015] Figure 3 A schematic diagram of a second starting current generating module provided according to an exemplary embodiment of the present application is shown;

[0016] Figure 4 A schematic diagram of a third starting current generating module provided according to an exemplary embodiment of the present application is shown;

[0017] Figure 5 A schematic diagram of a fourth starting current generating module provided according to an exemplary embodiment of the present application is shown;

[0018] Figure 6 A schematic diagram of a bandgap reference voltage generation module provided according to an exemplary embodiment of the present application is shown;

[0019] Figure 7 A schematic diagram of another bandgap reference voltage generation module provided according to an exemplary embodiment of the present application is shown;

[0020] Figure 8 A schematic diagram of another bandgap reference circuit provided according to an exemplary embodiment of the present application is shown.

[0021] In the figure,

[0022] 1. Start-up current generating module; 11. First current mirror unit; 111. First reference branch; 112. First mirror branch; 12. Current source unit; 13. Second current mirror unit; 131. Second reference branch; 132. Second mirror branch; 14. Third current mirror unit; 141. Third reference branch; 142. Third mirror branch; 2. Bandgap reference voltage generating module; 21. First voltage generating branch; 22. Second voltage generating branch; 23. Operational amplifier unit; 24. Current regulating unit. DETAILED DESCRIPTION

[0023] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0024] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0025] It should be noted that the modifications of "one" and "plurality" mentioned in the present application are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0026] The names of the messages or information exchanged between multiple devices in the embodiments of the present application are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0027] An embodiment of the present application provides a bandgap reference circuit. The bandgap reference circuit provided by the embodiment can be integrated in a chip or set in an electronic device.

[0028] like Figure 1 The bandgap reference circuit schematic diagram shown in the figure may include a startup current generating module 1 and a bandgap reference voltage generating module 2. The startup current generating module 1 may include a first current mirror unit 11 and a current source unit 12. The first current mirror unit 11 may include a first reference branch 111 and a first mirror branch 112.

[0029] The first end of the first mirror branch 112 is connected to the first end of the bandgap reference voltage generation module 2. When powered on, the current flowing through the first end of the bandgap reference voltage generation module 2 may include the set current generated by the current source unit 12 or the mirror current of the set current.

[0030] The first end of the first reference branch 111 is connected to the second end of the bandgap reference voltage generating module 2. After power-on, the current flowing through the second end of the bandgap reference voltage generating module 2 may include the negative feedback current generated by the bandgap reference voltage generating module 2, and the current flowing through the first end of the bandgap reference voltage generating module 2 may also include a mirror current of the negative feedback current.

[0031] The implementation principle is as follows:

[0032] The startup current generating module 1 may be provided with a current source unit 12 , and the current source unit 12 may generate a constant current with a set current value, ie, a set current.

[0033] First, the implementation principle of power-on is introduced:

[0034] When the power supply is powered on, the bandgap reference voltage generating module 2 is in a zero current state, and the current source unit 12 of the startup current generating module 1 can generate the above-mentioned set current to inject the startup current into the bandgap reference voltage generating module 2 to break the zero current state of the bandgap reference voltage generating module 2.

[0035] In a possible implementation, the set current may flow in from the first end of the bandgap reference voltage generating module 2, forming a path from the power supply to the current source unit 12, then to the bandgap reference voltage generating module 2, and finally to the ground, thereby breaking the zero current state of the bandgap reference voltage generating module 2.

[0036] In another possible implementation, the setting current generated by the current source unit 12 can generate a mirror current of the setting current in the first mirror branch 112 through the mirroring effect of the first current mirror unit 11. The mirror current of the setting current can flow into the first end of the bandgap reference voltage generation module 2, forming a path from the power supply to the first mirror branch 112, then to the bandgap reference voltage generation module 2, and finally to the ground, thereby breaking the zero current state of the bandgap reference voltage generation module 2.

[0037] Secondly, the implementation principle after the power supply is powered on is introduced:

[0038] After the power supply is powered on, the zero current state of the bandgap reference voltage generating module 2 is broken, and gradually stabilizes to a normal working state through negative feedback. During this process, a negative feedback current can be generated in the bandgap reference voltage generating module 2.

[0039] Since the first end of the first reference branch 111 is connected to the second end of the bandgap reference voltage generation module 2, the negative feedback current can flow through the first reference branch 111 of the first current mirror unit 11, thereby generating a mirror current of the negative feedback current in the first mirror branch 112 through the mirroring effect of the first current mirror unit 11. Since the first end of the first mirror branch 112 is connected to the first end of the bandgap reference voltage generation module 2, the mirror current of the negative feedback current can flow in from the first end of the bandgap reference voltage generation module 2, and the current flowing through the bandgap reference voltage generation module 2 is adjusted so that the bandgap reference voltage generation module 2 can gradually stabilize to a normal working state, thereby establishing a stable bandgap reference voltage and outputting it.

[0040] After the negative feedback current is generated, the current flowing through the first end of the bandgap reference voltage generation module 2 may include the set current generated by the current source unit 12 and the mirror current of the negative feedback current, or the mirror current of the set current generated by the current source unit 12 and the mirror current of the negative feedback current. Moreover, after the bandgap reference voltage generation module 2 stabilizes to a normal working state, the current flowing through the first end of the bandgap reference voltage generation module 2 may still be the above current, that is, the set current generated by the current source unit 12 and the mirror current of the negative feedback current in the circuit stable state, or the mirror current of the set current generated by the current source unit 12 and the mirror current of the negative feedback current in the circuit stable state.

[0041] On this basis, after the circuit works stably, the startup current generating module 1 can continue to be in the path without disconnection, thereby avoiding the problem of failure to disconnect normally. In addition, the set current generated by the current source unit 12 can constitute part of the current required for the normal operation of the bandgap reference voltage generating module 2, acting on the effective power consumption, thereby reducing the generation of additional power consumption. For example, assuming that the current required for the normal operation of the bandgap reference voltage generating module 2 is 4I, that is, the current flowing through the first end of the bandgap reference voltage generating module 2 is 4I, if the startup circuit in the prior art needs to be disconnected, the bandgap reference voltage generating module 2 adjusts the negative feedback current to 4I, which acts on the effective power consumption, and the power consumption generated by the startup circuit thereafter is additional power consumption; and in this embodiment, if the set current generated by the current source unit 12 is I, the bandgap reference voltage generating module 2 can adjust the negative feedback current to 3I, that is, the total current is still 4I, both of which act on the effective power consumption.

[0042] Specifically, the second end of the first reference branch 111 and the second end of the first mirror branch 112 are respectively used to receive the high-level voltage of the current voltage domain. The high-level voltage of the current voltage domain may include a power supply voltage, a battery voltage, etc., and the low-level voltage may include a ground voltage, a zero potential voltage, etc. This embodiment does not limit the specific voltage values ​​of the high-level voltage and the low-level voltage.

[0043] Optionally, the current source unit 12 may be arranged on one side of the first reference branch 111, or on one side of the first mirror branch 112. Four connection modes of the current source unit 12 in the startup current generating module 1 are introduced below.

[0044] Reference Figure 2 In the schematic diagram of the first startup current generating module shown, the first end of the current source unit 12 is connected to the first end of the first reference branch 111, and the second end of the current source unit 12 is used to receive the low level voltage of the current voltage domain.

[0045] In this case, the current source unit 12 is arranged on one side of the first reference branch 111, and the setting current generated by the current source unit 12 can start from the power supply, flow through the first reference branch 111, the current source unit 12, and flow to the ground. Through the action of the current mirror, the first mirror branch 112 generates a mirror current of the setting current, and the mirror current of the setting current starts from the power supply, flows through the first mirror branch 112, the bandgap reference voltage generation module 2, and flows to the ground.

[0046] Reference Figure 3A schematic diagram of a second starting current generating module is shown, in which the starting current generating module 1 may also include a second current mirror unit 13, the second current mirror unit 13 includes a second reference branch 131 and a second mirror branch 132; the first end of the current source unit 12 is used to receive a high-level voltage in the current voltage domain, and the second end of the current source unit 12 is connected to the first end of the second reference branch 131; the second end of the second reference branch 131 is used to receive a low-level voltage in the current voltage domain; the first end of the second mirror branch 132 is connected to the first end of the first reference branch 111, and the second end of the second mirror branch 132 is used to receive a low-level voltage in the current voltage domain.

[0047] In this case, the current source unit 12 is also arranged on the side of the first reference branch 111, and the set current generated by the current source unit 12 can start from the power supply, flow through the current source unit 12, the second reference branch 131, and flow to the ground. Through the action of the current mirror, the second mirror branch 132 generates a mirror current of the set current, and the mirror current of the set current starts from the power supply, flows through the first reference branch 111, the second mirror branch 132, and flows to the ground. Through the action of the current mirror, the first mirror branch 112 further generates another mirror current of the set current, and the mirror current of the set current starts from the power supply, flows through the first mirror branch 112, the bandgap reference voltage generation module 2, and flows to the ground.

[0048] Reference Figure 4 In the third schematic diagram of the startup current generating module shown, the first end of the current source unit 12 is used to receive the high-level voltage of the current voltage domain, and the second end of the current source unit 12 is connected to the first end of the first mirror branch 112 .

[0049] In this case, the current source unit 12 is arranged on one side of the first mirror branch 112 , and the set current generated by the current source unit 12 can start from the power supply, flow through the current source unit 12 , the bandgap reference voltage generation module 2 , and flow to the ground.

[0050] Reference Figure 5 The fourth schematic diagram of the startup current generating module is shown, the startup current generating module 1 can also include a third current mirror unit 14, the third current mirror unit 14 includes a third reference branch 141 and a third mirror branch 142; the first end of the third mirror branch 142 is connected to the first end of the first mirror branch 112 for receiving the high level voltage of the current voltage domain, and the second end of the third mirror branch 142 is connected to the first end of the first mirror branch 112; the first end of the third reference branch 141 is connected to the first end of the current source unit 12 for receiving the high level voltage of the current voltage domain, and the second end of the third reference branch 141 is connected to the first end of the current source unit 12; the second end of the current source unit 12 is used to receive the low level voltage of the current voltage domain.

[0051] In this case, the current source unit 12 is also arranged on one side of the first mirror branch 112, and the set current generated by the current source unit 12 can start from the power supply, flow through the third reference branch 141, the current source unit 12, and flow to the ground. Through the action of the current mirror, the third mirror branch 142 generates a mirror current of the set current, and the mirror current of the set current starts from the power supply, flows through the third mirror branch 142, the bandgap reference voltage generation module 2, and flows to the ground.

[0052] It should be noted that this embodiment does not limit the mirror ratio of each current mirror unit.

[0053] Optionally, the current value range of the set current can be 0<Ibias<Ifb, where Ibias represents the current value of the set current, and Ifb represents the current value of the mirror current of the negative feedback current in the stable state of the circuit, that is, the current value of the mirror current of the negative feedback current generated by the first mirror branch 112 in the stable state of the circuit. On this basis, the set current will be in a suitable current value range, which can make the negative feedback regulation effect in the bandgap reference voltage generation module 2 effective, and can also make the power-on startup efficient and reliable.

[0054] Optional, see Figure 6 The schematic diagram of the bandgap reference voltage generation module shown in the figure, the bandgap reference voltage generation module 2 may include a first voltage generation branch 21, a second voltage generation branch 22, an operational amplifier unit 23 and a current regulation unit 24;

[0055] A first end of the first voltage generating branch 21 is connected to a first end of the first mirror branch 112, and a second end of the first voltage generating branch 21 is used to receive a low level voltage of the current voltage domain;

[0056] A first end of the second voltage generating branch 22 is connected to a first end of the first mirroring branch 112, and a second end of the second voltage generating branch 22 is used to receive a low level voltage of the current voltage domain;

[0057] The first input terminal of the operational amplifier unit 23 is connected to the third terminal of the first voltage generating branch 21, the second input terminal of the operational amplifier unit 23 is connected to the third terminal of the second voltage generating branch 22, and the output terminal of the operational amplifier unit 23 is connected to the control terminal of the current regulating unit 24;

[0058] A first end of the current regulating unit 24 is connected to a first end of the first reference branch 111 , and a second end of the current regulating unit 24 is used to receive a low-level voltage of the current voltage domain.

[0059] The current regulating unit 24 may include a field effect transistor.

[0060] Optional, see Figure 7The schematic diagram of the bandgap reference voltage generation module shown in the figure, the first voltage generation branch 21 may include a first resistor unit R1 and a first transistor unit Q1, the first end of the first resistor unit R1 is connected to the first end of the first mirror branch 112, the second end of the first resistor unit R1 is connected to the first end of the first transistor unit Q1, and the second end of the first transistor unit Q1 is used to receive the low-level voltage of the current voltage domain;

[0061] The second voltage generating branch 22 may include a second resistor unit R2, a third resistor unit R3, and a second transistor unit Q2, wherein a first end of the second resistor unit R2 is connected to a first end of the first mirroring branch 112, a second end of the second resistor unit R2 is connected to a first end of the third resistor unit R3, a second end of the third resistor unit R3 is connected to a first end of the second transistor unit Q2, and a second end of the second transistor unit Q2 is used to receive a low-level voltage of the current voltage domain;

[0062] The first input terminal of the operational amplifier unit 23 is connected to the second end of the first resistor unit R1, and the second input terminal of the operational amplifier unit 23 is connected to the second end of the second resistor unit R2;

[0063] The first resistance unit R1 and the second resistance unit R2 have the same resistance value.

[0064] Optional, see Figure 8 In the schematic diagram of the bandgap reference circuit shown in FIG. 1 , the bandgap reference voltage generating module 2 may further include a trimming resistor unit Rtrim, wherein a first end of the trimming resistor unit Rtrim is connected to a first end of the first mirror branch 112, and a second end of the trimming resistor unit Rtrim is respectively connected to a first end of the first voltage generating branch 21 and a first end of the second voltage generating branch 22. The trimming resistor unit Rtrim may improve the accuracy of the bandgap reference voltage output by the bandgap reference circuit.

[0065] The following will Figure 8 Taking the bandgap reference circuit shown as an example, the implementation principle of the bandgap reference circuit is introduced.

[0066] Figure 8 In the figure, the MP1 tube corresponds to the first mirror branch 112, the MP2 tube corresponds to the first reference branch 111, and the MN1 tube corresponds to the current regulating unit 24. VDD represents the power supply voltage, VA represents the voltage of the positive input terminal of the operational amplifier unit 23, VB represents the voltage of the negative input terminal of the operational amplifier unit 23, VC represents the gate voltage of the MP1 tube and the MP2 tube, and VBG represents the bandgap reference voltage output by the bandgap reference circuit. The size ratio between the first transistor unit Q1 and the second transistor unit Q2 is 1:m, m>0.

[0067] The function of the operational amplifier unit 23 is to adjust the gate voltage of the MN1 tube so that the voltage VA at the in-phase input terminal is equal to the voltage VB at the inverting input terminal. The current across the third resistor unit R3 is (VBE1-VBE2) / R3, which is a positive temperature coefficient current. If there is no addition of the Ibias current, after the power supply is powered on, the gate voltage VC of the MP1 tube is high, the drain voltage VBG is low, and the bandgap reference voltage generation module 2 can be in a zero current state all the time, and the bandgap reference voltage cannot be output; by adding the Ibias current, after the power supply is powered on, the current of Ibias is mirrored to the MP1 tube through the MP2 tube, forming a path from power supply->Rtrim->ground, and the low voltage of the drain VBG of the MP1 tube is broken, and a voltage is formed at the VA and VB points. By reasonably setting the circuit parameters, the voltage at the VB point is higher than or equal to the voltage at the VA point after power-on, and the negative feedback adjustment of the operational amplifier unit 23 makes VA equal to VB. At this time, VBG=VBE2+(VBE1-VBE2) / R2*(R2+R3+Rtrim), wherein VBE1 is the emitter-base voltage of the first transistor unit Q1, VBE2 is the emitter-base voltage of the second transistor unit Q2, VBE2 is a negative temperature coefficient voltage with a temperature coefficient of -1.5mV / °K, VBE1-VBE2 is a positive temperature coefficient voltage with a temperature coefficient of 0.08mV / °K, and by setting a suitable (R2+R3+Rtrim) / R2, a bandgap reference voltage VBG with a zero temperature coefficient is obtained.

[0068] Specifically, if the voltage at point VA is higher than the voltage at point VB at the initial stage of power-on, the negative feedback regulation of the operational amplifier unit 23 fails, and the bandgap reference voltage cannot be established. At the initial stage of power-on, a path from power supply -> Rtrim -> ground is formed due to Ibias, and the voltage at point VD breaks the zero state. The first transistor unit Q1 and the first transistor unit Q2 are respectively equivalent to the model of 1 / gm, then:

[0069]

[0070] According to the above formula, the parameters are set so that VB≥VA. Therefore, in the initial stage of power-on, after the Ibias current pulls the VD point voltage out of zero, considering that the magnitude of the operational amplifier offset voltage is small, the VB point voltage minus the VA point voltage is greater than the offset voltage of the operational amplifier unit 23, and the output voltage of the operational amplifier unit 23 becomes lower, and the gate voltage of the MN1 tube is reduced, so that the current flowing through the MN1 tube is reduced, and the current mirrored to the MP1 tube by the MP2 tube is reduced, and the VB point voltage is reduced. Through the negative feedback regulation of the operational amplifier unit 23, the VA point voltage is equal to the VB point voltage, VBG=VBE2+ (VBE1-VBE2) / R3*(R2+R3+Rtrim), wherein VBE1 is the emitter-base voltage of the first transistor unit Q1, VBE2 is the emitter-base voltage of the second transistor unit Q2, VBE2 is a negative temperature coefficient voltage with a temperature coefficient of -1.5mV / °K, VBE1-VBE2 is a positive temperature coefficient voltage with a temperature coefficient of 0.08mV / °K, and by setting a suitable (R2+R3+Rtrim) / R2, a bandgap reference voltage VBG with a zero temperature coefficient is obtained.

[0071] The embodiments of the present application can achieve the following beneficial effects:

[0072] (1) The bandgap reference circuit may include a startup current generating module and a bandgap reference voltage generating module. The startup current generating module may include a first current mirror unit and a current source unit. The first current mirror unit may include a first reference branch and a first mirror branch. When powered on, the setting current or the mirror current of the setting current generated by the current source unit is injected into the bandgap reference voltage generating module through the startup current generating module, so that the bandgap reference circuit can be started efficiently. Moreover, after the circuit works stably, the startup current generating module can continue to be in the path without being disconnected, thereby avoiding the problem of failure to disconnect normally.

[0073] (2) The set current generated by the current source unit can constitute part of the current required for the normal operation of the bandgap reference voltage generation module, acting on the effective power consumption, thereby reducing the generation of additional power consumption.

[0074] The exemplary embodiment of the present application also provides a chip, including the bandgap reference circuit provided by the embodiment of the present application. When the bandgap reference circuit provided by the present embodiment is powered on, the set current or the mirror current of the set current generated by the current source unit is injected into the bandgap reference voltage generation module through the startup current generation module, so that the bandgap reference circuit can be efficiently started. Moreover, after the circuit works stably, the startup current generation module can continue to be in the path without being disconnected, thereby avoiding the problem of failure to disconnect normally and improving the reliability of the chip. Moreover, the set current generated by the current source unit can constitute part of the current required for the normal operation of the bandgap reference voltage generation module, acting on the effective power consumption, thereby reducing the generation of additional power consumption.

[0075] The exemplary embodiment of the present application also provides an electronic device, including the bandgap reference circuit provided by the embodiment of the present application. When the bandgap reference circuit provided by the present embodiment is powered on, the set current or the mirror current of the set current generated by the current source unit is injected into the bandgap reference voltage generation module through the startup current generation module, so that the bandgap reference circuit can be efficiently started. Moreover, after the circuit works stably, the startup current generation module can continue to be in the path without being disconnected, thereby avoiding the problem of failure to disconnect normally and improving the reliability of the electronic device. Moreover, the set current generated by the current source unit can constitute part of the current required for the normal operation of the bandgap reference voltage generation module, acting on the effective power consumption, thereby reducing the generation of additional power consumption.

Claims

1. A bandgap reference circuit, characterized in that: The bandgap reference circuit comprises a startup current generating module and a bandgap reference voltage generating module, the startup current generating module comprises a first current mirror unit and a current source unit, the first current mirror unit comprises a first reference branch and a first mirror branch; The first end of the first mirror branch is connected to the first end of the bandgap reference voltage generation module, and when powered on, the current flowing through the first end of the bandgap reference voltage generation module includes the set current generated by the current source unit or the mirror current of the set current; The first end of the first reference branch is connected to the second end of the bandgap reference voltage generating module. After power-on, the current flowing through the second end of the bandgap reference voltage generating module includes the negative feedback current generated by the bandgap reference voltage generating module, and the current flowing through the first end of the bandgap reference voltage generating module also includes a mirror current of the negative feedback current.

2. The bandgap reference circuit according to claim 1, characterized in that: A first end of the current source unit is connected to a first end of the first reference branch, and a second end of the current source unit is used to receive a low-level voltage of a current voltage domain.

3. The bandgap reference circuit according to claim 1, characterized in that: The startup current generating module further includes a second current mirror unit, wherein the second current mirror unit includes a second reference branch and a second mirror branch; The first end of the current source unit is used to receive the high level voltage of the current voltage domain, and the second end of the current source unit is connected to the first end of the second reference branch; The second end of the second reference branch is used to receive the low level voltage of the current voltage domain; The first end of the second mirror branch is connected to the first end of the first reference branch, and the second end of the second mirror branch is used to receive a low-level voltage of the current voltage domain.

4. The bandgap reference circuit according to claim 1, characterized in that: The first end of the current source unit is used to receive a high-level voltage in a current voltage domain, and the second end of the current source unit is connected to the first end of the first mirror branch.

5. The bandgap reference circuit according to claim 1, characterized in that: The startup current generating module further includes a third current mirror unit, and the third current mirror unit includes a third reference branch and a third mirror branch; The first end of the third mirror branch is used to receive the high level voltage of the current voltage domain, and the second end of the third mirror branch is connected to the first end of the first mirror branch; The first end of the third reference branch is used to receive the high level voltage of the current voltage domain, and the second end of the third reference branch is connected to the first end of the current source unit; The second terminal of the current source unit is used to receive a low level voltage of the current voltage domain.

6. The bandgap reference circuit according to claim 1, characterized in that: The second end of the first reference branch and the second end of the first mirror branch are respectively used to receive a high level voltage of a current voltage domain.

7. The bandgap reference circuit according to claim 1, characterized in that: The current value range of the set current is 0<Ibias<Ifb, wherein Ibias represents the current value of the set current, and Ifb represents the current value of the mirror current of the negative feedback current in a stable circuit state.

8. The bandgap reference circuit according to claim 1, characterized in that: The bandgap reference voltage generation module includes a first voltage generation branch, a second voltage generation branch, an operational amplifier unit and a current regulation unit; The first end of the first voltage generating branch is connected to the first end of the first mirror branch, and the second end of the first voltage generating branch is used to receive the low level voltage of the current voltage domain; The first end of the second voltage generating branch is connected to the first end of the first mirror branch, and the second end of the second voltage generating branch is used to receive the low level voltage of the current voltage domain; The first input terminal of the operational amplifier unit is connected to the third terminal of the first voltage generating branch, the second input terminal of the operational amplifier unit is connected to the third terminal of the second voltage generating branch, and the output terminal of the operational amplifier unit is connected to the control terminal of the current regulating unit; A first end of the current regulating unit is connected to a first end of the first reference branch, and a second end of the current regulating unit is used to receive a low-level voltage of a current voltage domain.

9. The bandgap reference circuit according to claim 8, characterized in that: The first voltage generating branch comprises a first resistor unit and a first transistor unit, wherein a first end of the first resistor unit is connected to a first end of the first mirroring branch, a second end of the first resistor unit is connected to a first end of the first transistor unit, and a second end of the first transistor unit is used to receive a low level voltage of a current voltage domain; The second voltage generating branch comprises a second resistor unit, a third resistor unit and a second transistor unit, wherein a first end of the second resistor unit is connected to a first end of the first mirroring branch, a second end of the second resistor unit is connected to a first end of the third resistor unit, a second end of the third resistor unit is connected to a first end of the second transistor unit, and a second end of the second transistor unit is used to receive a low level voltage of a current voltage domain; The first input end of the operational amplifier unit is connected to the second end of the first resistor unit, and the second input end of the operational amplifier unit is connected to the second end of the second resistor unit; The first resistance unit and the second resistance unit have the same resistance value.

10. The bandgap reference circuit according to claim 8, characterized in that: The current regulating unit includes a field effect transistor.

11. The bandgap reference circuit according to claim 8, characterized in that: The bandgap reference voltage generating module also includes a trimming resistor unit, a first end of the trimming resistor unit is connected to the first end of the first mirror branch, and a second end of the trimming resistor unit is respectively connected to the first end of the first voltage generating branch and the first end of the second voltage generating branch.

12. A chip, characterized in that: The method comprises a bandgap reference circuit as claimed in any one of claims 1 to 11.

13. An electronic device, characterized in that: The method comprises a bandgap reference circuit as claimed in any one of claims 1 to 11.

Images