A power supply circuit and a detector

Abstract

The application provides a power supply circuit and a detector. The power supply circuit comprises a positive temperature coefficient current source, a constant temperature coefficient current source, a first current mirror and a second current mirror. An input end of the first current mirror is connected to an output end of the positive temperature coefficient current source. An input end of the second current mirror is connected to an output end of the constant temperature coefficient current source. An output end of the second current mirror is connected to an input end or an output end of the first current mirror. An output end of the first current mirror is connected to an output end of the power supply circuit.

Description

Technical Field

[0001] This application relates to the field of integrated circuits, and more particularly to a power supply circuit and a detector including the power supply circuit. Background Technology

[0002] Electronic components are susceptible to the effects of ambient temperature, especially those that are highly temperature-sensitive. Therefore, in some functional circuits, it is often necessary to consider the impact of temperature on circuit performance. A common solution is to use a PTAT (Proportional to Absolute Temperature) current source to compensate for temperature-induced drift.

[0003] Figure 1 A schematic diagram of the circuit structure of a commonly used PTAT current source is shown. Figure 1 As shown, PM1 and PM2 are identical P-type MOSFETs, and their gates are biased at the same voltage. When they are both in saturation, the current flowing through the two P-type MOSFETs is the same, meaning the current flowing through Q1 and Q2 is the same, assuming it to be I0. Therefore, the voltages at points A and B are the same, and no current flows into the operational amplifier Amp. Q2 is equal to n Q1s. PM3, PM2, and PM1 form an m:1 current mirror. Based on the voltage relationship across resistor R, the current relationship between Q1 and Q2, and the current relationship between PM3 and PM2, the output current of PM3 is the output current of the PTAT current source.

[0004] exist Figure 1 In the PTAT shown, Where k is the Boltzmann constant, q is the electron charge, and T is the absolute temperature, the output current of a PTAT is mainly affected by three parameters: m, n, and R, primarily influencing the slope of the output current relative to temperature. Since the resistance R itself is affected by a temperature coefficient, the ratio of n to m is limited by the layout area and cannot increase indefinitely. Furthermore, there are mismatches between the field-effect transistor and the transistor, thus limiting the slope of the output current of a traditional PTAT current source.

[0005] Furthermore, the formula for calculating the output current of a traditional PTAT current source can be simplified to: Among them, slope k The range of variation is limited, and the intercept b It cannot be adjusted. Therefore, the adjustable range of the output current of a traditional PTAT current source is limited, and the output current often cannot be adjusted to the target current.

[0006] To address this issue, Chinese patent application No. 202310914726.5, entitled "An Output Adjustment Circuit for a PTAT Current Source," proposed a method that uses multi-stage cascaded current mirrors in conjunction with a shunt unit to solve the problem that the cutoff b of the output current of a traditional PTAT current source cannot be adjusted. This application proposes another power supply circuit that further improves the adjustable range of the output current of a traditional PTAT current source. Summary of the Invention

[0007] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0008] In order to overcome the above-mentioned defects, this application aims to provide a power supply circuit and a detector including the power supply circuit.

[0009] According to one aspect of this application, a power supply circuit is provided, comprising: a positive temperature coefficient current source, a constant temperature coefficient current source, a first current mirror, and a second current mirror, wherein the input terminal of the first current mirror is connected to the output terminal of the positive temperature coefficient current source, the input terminal of the second current mirror is connected to the output terminal of the constant temperature coefficient current source, the output terminal of the second current mirror is connected to the input terminal or the output terminal of the first current mirror, and the output terminal of the first current mirror is connected to the output terminal of the power supply circuit.

[0010] In one embodiment, the power supply circuit further includes a third current mirror, and the first current mirror and the third current mirror are cascaded together. The first current mirror is connected to the output terminal of the power supply circuit through the third current mirror.

[0011] Furthermore, the second current mirror includes an input transistor and N input-side mirror transistors. The input transistor and each input-side mirror transistor form a set of current mirrors. Each input-side mirror transistor is connected to the input terminal of the first current mirror through a switching transistor. N is an integer greater than or equal to 1.

[0012] In one embodiment, the power supply circuit further includes N fourth current mirrors cascaded with the N input-side image transistors, and the output terminal of each input-side image transistor is connected to the input terminal of the first current mirror through a fourth current mirror.

[0013] In one embodiment, the second current mirror further includes J output-side mirror transistors. The input transistor and each output-side mirror transistor form a set of current mirrors. Each output-side mirror transistor is connected to the output terminal of the first current mirror through a switching transistor. J is an integer greater than or equal to 1.

[0014] In an optional embodiment, the power supply circuit further includes N fifth current mirrors cascaded with the N input-side image transistors, wherein the output terminal of each input-side image transistor is connected to the input terminal of the first current mirror through a fifth current mirror.

[0015] In an optional embodiment, the power supply circuit further includes J sixth current mirrors cascaded with the J output-side image transistors, wherein the output terminal of each output-side image transistor is connected to the output terminal of the first current mirror through a sixth current mirror.

[0016] In an optional embodiment, the power supply circuit further includes: N fifth current mirrors cascaded with the N input-side image transistors respectively, the output terminal of each input-side image transistor being connected to the input terminal of the first current mirror through a fifth current mirror; and J sixth current mirrors cascaded with the J output-side image transistors respectively, the output terminal of each output-side image transistor being connected to the output terminal of the first current mirror through a sixth current mirror.

[0017] Ideally, N should be 4 and J should be 4.

[0018] Preferably, the power supply circuit is an integrated circuit. Each switching transistor can function as an electronic fuse for chip calibration within the integrated circuit. Alternatively, the control terminal of each switching transistor can be configured as an external switch, facilitating debugging after fabrication or multi-position operation during use.

[0019] In one embodiment, the constant temperature coefficient current source includes an operational amplifier, a first P-type MOSFET, a second P-type MOSFET paired with the first P-type MOSFET, a third P-type MOSFET, a fourth P-type MOSFET, a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor. The positive and negative input terminals of the operational amplifier are respectively connected to the drains of the second P-type MOSFET and the first P-type MOSFET. The gates of the second P-type MOSFET and the first P-type MOSFET are connected to the output terminal of the operational amplifier. The second P-type MOSFET and the first P-type MOSFET operate in saturation. The drain of the MOSFET is grounded through the first transistor and the third resistor. The drain of the second P-type MOSFET is connected to the ground of the second transistor through the first resistor and to the ground through the second resistor. The bases of the first transistor and the second transistor are grounded. The gates of the third P-type MOSFET and the fourth P-type MOSFET are connected to the gate of the second P-type MOSFET. The drain of the third P-type MOSFET is grounded through the fourth resistor. The sources of the first P-type MOSFET, the second P-type MOSFET, the third P-type MOSFET, and the fourth P-type MOSFET are connected to the power supply. The drain of the fourth P-type MOSFET serves as the output terminal of the constant temperature coefficient current source.

[0020] According to another aspect of this application, a detector is also provided, including the power supply circuit described in any of the foregoing embodiments.

[0021] This application significantly improves the adjustable intercept range of the power supply circuit by adding a constant temperature coefficient current source to a traditional positive temperature coefficient current source (PTAT). At the same time, the current direction of the constant temperature coefficient current source can be set as needed, further increasing the adjustable intercept range of the power supply circuit. Furthermore, the number of constant temperature coefficient current sources connected can be controlled by multiple switching transistors in conjunction with multiple sets of current mirrors, so that the adjustment function can still be maintained after the integrated circuit is manufactured, which can reduce the design difficulty of the power supply circuit in the early stage to a certain extent. Attached Figure Description

[0022] The above features and advantages of this application will be better understood after reading the detailed description of the embodiments of this disclosure in conjunction with the following accompanying drawings.

[0023] Figure 1 This is a circuit diagram of a positive temperature coefficient current source drawn according to existing technology; Figure 2 This is a schematic diagram of the circuit structure of a power supply circuit in one embodiment according to one aspect of this application; Figure 3 This is a schematic diagram of the power supply circuit in another embodiment according to one aspect of this application; Figure 4 This is a schematic diagram of the circuit structure of a power supply circuit in another embodiment according to one aspect of this application; Figure 5 This is a schematic diagram of the circuit structure of a power supply circuit in another embodiment according to one aspect of this application; Figure 6 This is a schematic diagram of the circuit structure of a power supply circuit in another embodiment according to one aspect of this application; Figure 7 This is a schematic diagram of the circuit structure of a power supply circuit in another embodiment according to one aspect of this application; Figure 8 This is a schematic diagram of the circuit structure of a power supply circuit in another embodiment according to one aspect of this application; Figure 9 This is a schematic diagram of the circuit structure of a power supply circuit in another embodiment according to one aspect of this application; Figure 10 This is a schematic diagram of the circuit structure of a constant temperature coefficient current source in one embodiment according to one aspect of this application; Figure 11 This is a schematic diagram of the detector architecture in one embodiment according to another aspect of this application. Detailed Implementation

[0024] The following description is provided to enable those skilled in the art to implement and use this application and incorporate it into specific application contexts. Various variations and uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein are applicable to a wide range of embodiments. Therefore, this application is not limited to the embodiments given herein, but should be granted the broadest scope consistent with the principles and novel features disclosed herein.

[0025] In the following detailed description, numerous specific details are set forth to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that practice of this application is not necessarily limited to these specific details. In other words, well-known structures and devices are shown in block diagram form without detailed representation to avoid obscuring this application.

[0026] Readers should note all documents and references submitted concurrently with this specification and open to public inspection, the contents of which are incorporated herein by reference. Unless otherwise expressly stated, all features disclosed in this specification (including any appended claims, abstracts, and drawings) may be replaced by alternative features for the same, equivalent, or similar purposes. Therefore, unless explicitly stated otherwise, each disclosed feature is merely one example of a set of equivalent or similar features.

[0027] Note that, where used, the markings left, right, front, back, top, bottom, front, back, clockwise, and counterclockwise are merely for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative position and / or orientation between different parts of an object. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Note that, in practice, "further," "preferably," "even further," and "more preferably" are simply starting points for describing another embodiment based on the foregoing embodiments. The combination of the content following "further," "preferably," "even further," or "more preferably" with the foregoing embodiments constitutes the complete configuration of another embodiment. Any combination of several "further," "preferably," "even further," or "more preferably" settings following the same embodiment can form yet another embodiment.

[0029] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of this application in any way.

[0030] According to one aspect of this application, a power supply circuit is provided.

[0031] Figure 2and Figure 3 A schematic diagram of a power supply circuit in one embodiment is shown. (As shown) Figure 2 and Figure 3 As shown, in this embodiment, the power supply circuit includes a positive temperature coefficient current source PTAT, a zero temperature coefficient current source ZTC, a first current mirror CM1, and a second current mirror CM2. The input terminal of the first current mirror CM1 is connected to the output terminal of the positive temperature coefficient current source PTAT, the input terminal of the second current mirror CM2 is connected to the output terminal of the zero temperature coefficient current source ZTC, and the output terminal of the first current mirror CM1 is connected to the output terminal of the power supply circuit.

[0032] The first current mirror CM1 includes N-type MOSFETs M1 and M2. MOSFET M1 is the input transistor of the first current mirror CM1, and its drain forms the input terminal. MOSFET M2 is the mirror transistor of the first current mirror CM1, and its drain forms the output terminal, which is connected to the output terminal of the power supply circuit (in terms of circuit principle, the output terminal of the first current mirror CM1 serves as the output terminal of the power supply circuit; when the power supply circuit has an external power supply terminal, the output terminal of the first current mirror CM1 is connected to that power supply terminal). The gate of MOSFET M1 and its drain are connected to the gate of MOSFET M2, and the sources of MOSFETs M1 and M2 are grounded.

[0033] Similar to the first current mirror CM1, the second current mirror CM2 includes N-type MOSFETs M3 and M4. MOSFET M3 is the input transistor of the second current mirror CM2, and its drain forms the input terminal of the second current mirror CM2. MOSFET M4 is the mirror transistor of the second current mirror CM2, and its drain forms the output terminal of the second current mirror CM2. The gate of MOSFET M3 and its drain are connected to the gate of MOSFET M4, and the sources of MOSFETs M3 and M4 are grounded.

[0034] Figure 2 The illustrated embodiments and Figure 3 The difference in the illustrated embodiments is that: Figure 2 In the illustrated embodiment, the output terminal of the second current mirror CM2 is connected to the input terminal of the first current mirror CM1; Figure 3 In the embodiment shown, the output terminal of the second current mirror CM2 is connected to the output terminal of the first current mirror CM1.

[0035] exist Figure 2 and Figure 3In the embodiment, assuming the output current of the positive temperature coefficient current source PTAT is I1 = k·T + b, the output current of the constant temperature coefficient current source ZTC is I2, the replication ratio of the first current mirror CM1 is n:1, and the replication ratio of the second current mirror CM2 is m:1, then Figure 2 The output current I of the power supply circuit shown out =n·(I1-m·I2)=n·k·T+n·bn·m·I2, Figure 3 The output current I of the power supply circuit shown out =n·I1+m·I2= n·k·T+n·b+m·I2, since the output current of the constant temperature coefficient current source ZTC is I2, which is a constant temperature coefficient current source and is independent of temperature, it is obvious that the intercept of the output current of the power supply circuit is adjusted, and the slope of the output current of the power supply circuit is also adjusted.

[0036] At the same time, from Figure 2 and Figure 3 As can be seen from the expression of the output current in the illustrated embodiments, the intercept adjustment trends of the two embodiments are opposite, which can expand the intercept adjustment range of the power supply circuit. Those skilled in the art can select the connection method corresponding to the appropriate adjustment trend as needed.

[0037] Further, refer to Figure 2 and Figure 3 The current flows in the same direction at the input and output terminals of the current mirror. Figure 2 and Figure 3 In this embodiment, the output current flows in the same direction as the PTAT current. When the power supply circuit is connected to any load, the current at the load end flows according to... Figure 2 and Figure 3 The current arrow indicates the outflow. This is understandable, as power supply circuits are widely used and have various applications. Figure 2 and Figure 3 Based on this, those skilled in the art can cascade another current mirror at the output terminal of the first current mirror CM1 to change the direction of the output current.

[0038] For reference Figure 4 and Figure 5 ,like Figure 4 and Figure 5 As shown, the power supply circuit may further include a third current mirror CM3 cascaded with the first current mirror. The output terminal of the first current mirror CM1 is connected to the output terminal of the power supply circuit through the third current mirror CM3. When the output terminal of the power supply circuit is connected to any load, the output current Iout of the power supply circuit is input to the load terminal.

[0039] In this context, cascading refers to connecting the output of the preceding stage circuit to the input of the following stage circuit. For example... Figure 4 and Figure 5As shown, the third current mirror CM3 includes P-type MOSFETs M5 and M6. MOSFET M5 is the input transistor of the third current mirror CM3, and its drain forms the input terminal of the third current mirror CM3. MOSFET M6 is the mirror transistor of the third current mirror CM3, and its drain forms the output terminal of the third current mirror CM3. The gate of MOSFET M5 and its drain, as well as the gate of MOSFET M6, are connected together. The sources of MOSFETs M5 and M6 are connected to a bias voltage. The output terminal of the first current mirror CM1 is connected to the input terminal of the third current mirror CM3, and the output terminal of the third current mirror CM3 is connected to the output terminal of the power supply circuit (i.e., the output terminal of the first current mirror is connected to the output terminal of the power supply circuit via the third current mirror).

[0040] For reference Figure 2 and Figure 3 , Figure 4 The illustrated embodiments and Figure 5 The difference in the illustrated embodiments is that: Figure 4 In the illustrated embodiment, the output terminal of the second current mirror CM2 is connected to the input terminal of the first current mirror CM1; Figure 5 In the embodiment shown, the output terminal of the second current mirror CM2 is connected to the output terminal of the first current mirror CM1.

[0041] Furthermore, in Figures 2-5 Based on the embodiment shown, the mirror transistor of the second current mirror CM2 can also be configured as multiple transistors, which are connected to the input or output terminal of the first current mirror CM1 through series switching transistors, so as to further increase the intercept adjustment range of the output current of the power supply circuit.

[0042] Figure 6 It shows in Figure 2 Based on the illustrated embodiment, several additional embodiments with mirror tubes have been added. For example... Figure 6 As shown, this embodiment is relative to Figure 2 The difference in the illustrated embodiment is that the mirror transistor M4 of the second current mirror CM2 includes N MOSFETs M41~M4N. The output terminals of the N MOSFETs M41~M4N are respectively connected to the input terminal of the first current mirror CM1 through corresponding switching transistors K1~KN. That is, the N MOSFETs M41~M4N respectively constitute N input-side mirror transistors M41~M4N, and each input-side mirror transistor and the input transistor M3 form a current mirror. Correspondingly, assuming the output current of the positive temperature coefficient current source PTAT is I1, the output current of the constant temperature coefficient current source ZTC is I2, the replication ratio of the first current mirror CM1 is n:1, the replication ratio of the second current mirror CM2 is m:1, and the output current of this power supply circuit is I... out =n·(I1-m· ·I2)=n·I1-n·m· ·I2, where, denoted as the number of switching transistors K1~KN turned on in the second current mirror, where N is a natural number greater than or equal to 1.

[0043] Figure 7 It shows in Figure 5 Based on the illustrated embodiment, several additional embodiments with mirror tubes have been added. For example... Figure 7 As shown, this embodiment is relative to Figure 5 The difference in the illustrated embodiment is that the mirror transistor M4 of the second current mirror CM2 includes J MOSFETs M41~M4J. The output terminals of the J MOSFETs M41~M4J are respectively connected to the output terminal of the first current mirror CM1 through corresponding switching transistors K1~KJ. That is, the J MOSFETs M41~M4J respectively constitute J output-side mirror transistors M41~M4J, and each input-side mirror transistor and input transistor M3 form a current mirror. Correspondingly, assuming the output current of the positive temperature coefficient current source PTAT is I1, the output current of the constant temperature coefficient current source ZTC is I2, the replication ratio of the first current mirror CM1 is n:1, the replication ratio of the second current mirror CM2 is m:1, and the replication ratio of the third current mirror CM3 is k:1, the output current of this power supply circuit is I... out =k·(n·I1+m· ·I2)=k·n·I1+k·m· ·I2, where, The number of output-side switching transistors K1~KJ in the second current mirror that are turned on, where J is a natural number greater than or equal to 1.

[0044] Furthermore, combined Figure 6 and Figure 7 Furthermore, N input-side mirror transistors and J output-side mirror transistors can be connected to the input and output sides of the first current mirror CM1, respectively. For example... Figure 8 As shown, this embodiment is relative to Figure 4 or Figure 5The difference in the illustrated embodiment is that the mirror transistor M4 of the second current mirror CM2 includes N input-side mirror transistors ML1~MLN and J output-side mirror transistors MR1~MRJ. The output terminals of the N input-side mirror transistors ML1~MLN are respectively connected to the input terminal of the first current mirror CM1 through corresponding input-side switching transistors KL1~KLN. That is, the N input-side mirror transistors ML1~MLN and the input transistor M3 form N sets of current mirrors. The output terminals of the J output-side mirror transistors MR1~MRJ are respectively connected to the output terminal of the first current mirror CM1 through corresponding output-side switching transistors KR1~KRJ. That is, the J output-side mirror transistors MR1~MRJ and the input transistor M3 form J sets of current mirrors. Correspondingly, assuming the output current of the positive temperature coefficient current source PTAT is I1, the output current of the constant temperature coefficient current source ZTC is I2, the replication ratio of the first current mirror CM1 is n:1, the replication ratio of the second current mirror CM2 is m:1, and the replication ratio of the third current mirror CM3 is k:1, the output current of this power supply circuit is I... out =k·(n·(I1-m· · I2)+m· ·I2)=k·n·I1-(k·m· - k·m· )·I2, where, This refers to the number of input-side switching transistors KL1~KLN that are turned on in the second current mirror. N represents the number of output-side switching transistors KR1~KRJ in the second current mirror that are turned on, where N and M are natural numbers greater than or equal to 1.

[0045] In the aforementioned embodiments, the intercept of the power supply circuit can be adjusted during chip testing by controlling the on or off of multiple switching transistors, so that the structure of the power supply circuit and its output current can still be adjusted after tape-out. Preferably, in Figure 8 In the illustrated embodiment, the cutoff of the power supply circuit can be adjusted to be larger or smaller.

[0046] Preferably, in one or more of the foregoing embodiments, the power supply circuit is an integrated circuit. The control terminal of each switching transistor is configured as an external switch to facilitate post-fabrication debugging or to adapt to more power requirements of the user. Optionally, in other embodiments, the switching transistor may also be fully integrated inside the chip as an electronic fuse for calibrating the chip within the integrated circuit.

[0047] Preferably, Figure 8 N and M can be set to 4 to meet the needs of multi-level adjustment.

[0048] In one or more of the foregoing embodiments, the input current of the first current mirror CM1 and the output current of the second current mirror flow in the same direction, and the output current of the first current mirror CM1 and the output current of the second current mirror also flow in the same direction. Preferably, the direction of the output current of the second current mirror can be changed by connecting another current mirror to the output terminal of the second current mirror.

[0049] by Figure 2 For example, Figure 9 exist Figure 2 Based on the embodiment shown, a fourth current mirror is also provided at the output terminal of the second current mirror. For example... Figure 9 As shown, Figure 9 The illustrated embodiment is relative to Figure 2 The difference in the illustrated embodiment is that the second current mirror CM2 and the fourth current mirror CM4 are cascaded, and the output terminal of the second current mirror CM2 is connected to the input terminal of the first current mirror CM1 through the fourth current mirror CM4.

[0050] In this context, cascading refers to connecting the output of the preceding stage circuit to the input of the following stage circuit. For example... Figure 9 As shown, the fourth current mirror CM4 includes P-type MOSFETs M7 and M8. MOSFET M7 is the input transistor of the fourth current mirror CM4, and its drain forms the input terminal of CM4. MOSFET M8 is the mirror transistor of the fourth current mirror CM4, and its drain forms the output terminal of CM4. The gate of MOSFET M7 is connected to its drain, and the gate of MOSFET M8 is connected to the gate of MOSFET M8. The sources of MOSFETs M7 and M8 are connected to a bias voltage. The output terminal of the second current mirror CM2 is connected to the input terminal of the fourth current mirror CM4, and the output terminal of the fourth current mirror CM4 is connected to the input terminal of the first current mirror CM1 (i.e., the output terminal of the second current mirror is connected to the output terminal of the power supply circuit via the fourth current mirror).

[0051] exist Figure 9 In the illustrated embodiment, assuming the output current of the positive temperature coefficient current source PTAT is I1, the output current of the constant temperature coefficient current source ZTC is I2, the replication ratio of the first current mirror CM1 is n:1, the replication ratio of the second current mirror CM2 is m:1, and the replication ratio of the fourth current mirror CM4 is j:1, the output current of this power supply circuit is I... out =n·(I1+j·m·I2). When the output terminal of this power supply circuit is connected to the load terminal, the load terminal current flows into the output terminal of the first current mirror, and the magnitude is I. out =n·(I1+j·m· I2)

[0052] Understandable, Figures 3-8 In any embodiment, any mirror tube in the second current mirror can be connected to a Figure 9The fourth current mirror CM4 shown is used to change the current flow direction and then connect to the input or output terminal of the first current mirror CM1.

[0053] For example, in Figure 8 In the illustrated embodiment, N input-side mirror transistors can be cascaded with N fourth current mirrors respectively, and the output terminal of each input-side mirror transistor is connected to the input terminal of the first current mirror through a fourth current mirror; and / or, J output-side mirror transistors can also be cascaded with J fourth current mirrors respectively, and the output terminal of each output-side mirror transistor is connected to the output terminal of the first current mirror through a fourth current mirror.

[0054] Figure 10 exist Figure 1 Based on the positive temperature coefficient current source PTAT shown, a schematic diagram of the circuit structure of the constant temperature coefficient current source ZTC is drawn. For example... Figure 10 As shown, the constant temperature coefficient current source includes an operational amplifier (Amp), a first P-type MOSFET PM1, a second P-type MOSFET PM2 paired with the first P-type MOSFET, a third P-type MOSFET PM3, a fourth P-type MOSFET PM4, a first transistor Q1, a second transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The positive input terminal (+) and negative input terminal (-) of the operational amplifier Amp are connected to the drains of the second P-type MOSFET PM2 and the first P-type MOSFET PM1, respectively. The gates of the second P-type MOSFET PM2 and the first P-type MOSFET PM1 are connected to the output terminal of the operational amplifier Amp. The second P-type MOSFET PM2 and the first P-type MOSFET PM1 operate in saturation. The first P-type MOSFET PM1... The drain of S-type MOSFET PM1 is grounded through the first transistor Q1 and the third resistor R3. The drain of the second P-type MOSFET PM2 is connected to the ground of the second transistor Q2 through the first resistor R1 and to the ground through the second resistor R2. The bases of the first transistor Q1 and the second transistor Q2 are grounded. The gates of the third P-type MOSFET PM3 and the fourth P-type MOSFET PM4 are connected to the gate of the second P-type MOSFET PM2. The drain of the third P-type MOSFET PM3 is grounded through the fourth resistor R4. The sources of the first P-type MOSFET PM1, the second P-type MOSFET PM2, the third P-type MOSFET PM3 and the fourth P-type MOSFET PM4 are connected to the power supply Vdd. The drain of the fourth P-type MOSFET PM4 serves as the output terminal of the constant temperature coefficient current source ZTC.

[0055] Figure 10 The constant temperature coefficient current source ZTC shown is relative to Figure 1The difference between the positive temperature coefficient current source PTAT shown is that the third P-type MOSFET PM3 is grounded through the fourth resistor R4, the drain of the first P-type MOSFET PM1 is also grounded through the third resistor R3, the drain of the second P-type MOSFET PM2 is also grounded through the second resistor R2, and a new mirror transistor PM2, the fourth PMOS transistor PM4, is added. The drain of the fourth PMOS transistor PM4 serves as the output terminal of the constant temperature coefficient current source ZTC.

[0056] According to another aspect of this application, a detector including the power supply circuit of the foregoing embodiments may also be provided.

[0057] Figure 11 A schematic diagram of the detector architecture in one embodiment is shown. Figure 11 As shown, the detector's circuit architecture may include a multi-stage limiting amplifier circuit, multiple detection units connected to the output terminals of the multi-stage limiting amplifier circuit, a current summation and driving unit, and a temperature compensation unit. The temperature compensation circuit may employ the power supply circuit described in the aforementioned embodiment.

[0058] Understandable. Figure 11 The detector architecture described herein is for illustrative purposes only. Various detector architectures already exist in the prior art, and those skilled in the art can select a suitable detector architecture as needed. This application does not impose any restrictions on this.

[0059] The prior description of this disclosure is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not intended to be limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power supply circuit, characterized in that, include: The system includes a positive temperature coefficient current source, a constant temperature coefficient current source, a first current mirror, and a second current mirror. The input terminal of the first current mirror is connected to the output terminal of the positive temperature coefficient current source. The input terminal of the second current mirror is connected to the output terminal of the constant temperature coefficient current source. The output terminal of the second current mirror is connected to either the input or output terminal of the first current mirror. The output terminal of the first current mirror is connected to the output terminal of the power supply circuit.

2. The power supply circuit as described in claim 1, characterized in that, It also includes a third current mirror, and the first current mirror is cascaded with the third current mirror. The first current mirror is connected to the output terminal of the power supply circuit through the third current mirror.

3. The power supply circuit as described in claim 1 or 2, characterized in that, The second current mirror includes an input transistor and N input-side mirror transistors. The input transistor and each input-side mirror transistor form a set of current mirrors. Each input-side mirror transistor is connected to the input terminal of the first current mirror through a switching transistor. N is an integer greater than or equal to 1.

4. The power supply circuit as described in claim 3, characterized in that, It also includes N fourth current mirrors cascaded with the N input-side mirror transistors, and the output terminal of each input-side mirror transistor is connected to the input terminal of the first current mirror through a fourth current mirror.

5. The power supply circuit as described in claim 3, characterized in that, The second current mirror also includes J output-side mirror transistors. The input transistor and each of the output-side mirror transistors form a set of current mirrors. Each output-side mirror transistor is connected to the output terminal of the first current mirror through a switching transistor. J is an integer greater than or equal to 1.

6. The power supply circuit as described in claim 5, characterized in that, Also includes: N fifth current mirrors are cascaded with the N input-side image transistors, and the output terminal of each input-side image transistor is connected to the input terminal of the first current mirror through a fifth current mirror; and / or J sixth current mirrors are cascaded with the J output-side mirror transistors, and the output terminal of each output-side mirror transistor is connected to the output terminal of the first current mirror through a sixth current mirror.

7. The power supply circuit as described in claim 5, characterized in that, N is 4, J is 4.

8. The power supply circuit as described in claim 5, characterized in that, The power supply circuit is an integrated circuit, and each of the switching transistors is an on-chip electronic fuse or the control terminal is set as an external switch.

9. The power supply circuit as described in claim 1, characterized in that, The constant temperature coefficient current source includes an operational amplifier, a first P-type MOSFET, a second P-type MOSFET paired with the first P-type MOSFET, a third P-type MOSFET, a fourth P-type MOSFET, a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor. The positive and negative input terminals of the operational amplifier are respectively connected to the drains of the second P-type MOSFET and the first P-type MOSFET. The gates of the second P-type MOSFET and the first P-type MOSFET are connected to the output terminal of the operational amplifier. The second P-type MOSFET and the first P-type MOSFET operate in saturation. The drain of the first P-type MOSFET is connected to... The first transistor and the third resistor are grounded. The drain of the second P-type MOSFET is connected to the ground of the second transistor through the first resistor and to the ground through the second resistor. The bases of the first transistor and the second transistor are grounded. The gates of the third P-type MOSFET and the fourth P-type MOSFET are connected to the gate of the second P-type MOSFET. The drain of the third P-type MOSFET is grounded through the fourth resistor. The sources of the first P-type MOSFET, the second P-type MOSFET, the third P-type MOSFET, and the fourth P-type MOSFET are connected to the power supply. The drain of the fourth P-type MOSFET serves as the output terminal of the constant temperature coefficient current source.

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

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