Numerical control temperature coefficient reference current control and regulation circuit and method

Abstract

The invention relates to a numerical control temperature coefficient reference current control adjusting circuit and method. The numerical control temperature coefficient reference current control adjusting circuit comprises a band-gap reference source, a current mirror module, a weighting module and a current adder. The band-gap reference source is configured to output positive temperature coefficient reference current and negative temperature coefficient reference current to the current mirror module; the current mirror module is configured to copy positive temperature coefficient reference current and negative temperature coefficient reference current input by the band-gap reference source and input the positive temperature coefficient reference current and the negative temperature coefficient reference current into the current adder through the weighting module; the weighting module is configured to control and adjust the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input into the current adder according to the calculated weighting coefficient; and the current adder is configured to adjust the temperature coefficient of the output reference current according to the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input by the weighting module. According to the invention, the complexity of the whole circuit structure is reduced, and flexible adjustment of the output current from the positive temperature coefficient to the negative temperature coefficient can be realized.

Description

Technical Field

[0001] The present invention relates to the field of integrated circuits, and in particular to a digitally controlled temperature coefficient reference current control and regulation circuit and method. Background Art

[0002] The bandgap reference source is one of the most important and widely used functional modules of integrated circuits. It is a circuit that can provide a stable reference voltage or current. It has the advantage of being almost independent of process and temperature changes. It is widely used in high-precision comparators, data converters and other analog integrated circuits. Its basic principle is to use the sum of a voltage with a positive temperature coefficient and a voltage with a negative temperature coefficient. The temperature coefficients of the two cancel each other out, thereby realizing a voltage reference that is independent of temperature.

[0003] Therefore, the bandgap reference source can output a reference current with a positive temperature coefficient and a reference current with a negative temperature coefficient. In practical applications, the bias of different modules usually requires temperature compensation. Sometimes it is necessary to output a reference current with a positive temperature coefficient, and sometimes it is necessary to output a reference current with a negative temperature coefficient. Therefore, in order to meet the use requirements, two interfaces need to be connected from the bandgap reference source to output a reference current with a positive temperature coefficient and a reference current with a negative temperature coefficient respectively. This undoubtedly increases the complexity of the overall circuit interface, and it is impossible to adjust the reference current with positive and negative temperature coefficients, and it is impossible to achieve flexible adjustment and control of the current temperature coefficient. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a digitally controlled temperature coefficient reference current control regulation circuit and method to solve the deficiencies of the prior art.

[0005] The object of the present invention is achieved by the following technical scheme: a digitally controlled temperature coefficient reference current control and regulation circuit, which comprises a bandgap reference source, a current mirror module, a weighting module and a current adder; the bandgap reference source is connected to the current mirror module, the current mirror module is connected to the weighting module, and the weighting module is connected to the current adder;

[0006] The bandgap reference source is configured to output a positive temperature coefficient reference current and a negative temperature coefficient reference current to the current mirror module;

[0007] The current mirror module is configured to copy the positive temperature coefficient reference current and the negative temperature coefficient reference current input by the bandgap reference source, and input them into the current adder through the weighting module;

[0008] The weighting module is configured to control and adjust the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input to the current adder according to the calculated weighting coefficient;

[0009] The current adder is configured to adjust the temperature coefficient of the output reference current according to the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input by the weighting module.

[0010] The current mirror module includes a first current mirror and a second current mirror; the bandgap reference source is connected to the first current mirror and the second current mirror respectively, and the first current mirror and the second current mirror are connected to the weighting module;

[0011] The first current mirror is configured to replicate the positive temperature coefficient reference current input by the bandgap reference source and input it into the current adder through the weighting module;

[0012] The second current mirror is configured to replicate the negative temperature coefficient reference current input by the bandgap reference source and input the copy to the current adder through a weighting module.

[0013] The weighting module comprises a first weighting component and a second weighting component, the first weighting component is connected to the first current mirror and the current adder respectively, and the second weighting component is connected to the second current mirror and the current adder respectively;

[0014] The first weighting component is configured to control and adjust the magnitude of the positive temperature coefficient reference current input to the current adder according to the calculated weighting coefficient;

[0015] The second weighting component is configured to control and adjust the magnitude of the negative temperature coefficient reference current input to the current adder according to the calculated weighting coefficient.

[0016] The first weighted component includes a plurality of weighted units connected in parallel between the first current mirror and the current adder. The on / off state of each weighted unit is controlled by the calculated weighted coefficient, thereby controlling and adjusting the magnitude of the positive temperature coefficient reference current input to the current adder.

[0017] The second weighted component includes a plurality of weighted units connected in parallel between the second current mirror and the current adder, and the on-off state of each weighted unit is controlled by the calculated weighted coefficient, thereby controlling and adjusting the magnitude of the negative temperature coefficient reference current input to the current adder.

[0018] The calculation of the weighting coefficient includes:

[0019] The reference positive temperature coefficient reference current output by the bandgap reference source is set to y1=k1x+b1, and the reference negative temperature coefficient reference current is set to y2=k2x+b2, where k1 and k2 represent the slopes of the reference positive temperature coefficient reference current and the reference negative temperature coefficient reference current, respectively, and b1 and b2 represent the intercepts of the reference positive temperature coefficient reference current and the reference negative temperature coefficient reference current, respectively;

[0020] The reference current after passing through the current adder is y=ni y1+m i y2=n i (k1x+b1)+m i (k2x+b2)=K i x+B i , where K i =n i k1+m i k2, B i =n i b1+m i b2, i indicates that the configuration is the i-th configuration state, and the value range of i is: 0~2 N -1,n i Represents the weighting coefficient of the positive temperature coefficient reference current in the i-th configuration state, m i represents the weighting coefficient of the negative temperature coefficient reference current in the i-th configuration state;

[0021] Set the weighting coefficient to meet the conditions To ensure that the reference current curve under different temperature coefficient configurations has a constant reference current y0 at a certain temperature x0;

[0022] Set the slope K in the i-th configuration state i and intercept B i is an intermediate state to ensure that the slope of the output current curve can be increased or decreased and can be adjusted. The weighting coefficient in the i-th configuration state is determined as

[0023] Set the temperature coefficient reference current slope step to ΔK = K i+1 -K i , then the weight coefficients of different weighting units are

[0024]

[0025] Then, according to the reference positive and negative temperature coefficient reference current slope (k1, k2) and the reference positive and negative temperature coefficient reference current slope intercept (b1, b2) output by the bandgap reference source, the slope of the intermediate configuration state (K i ) and the intercept (B i ), the number of digital control bits (N), the intersection temperature (x0), and the target temperature coefficient reference current slope step (ΔK), and the weighting coefficients of each weighting unit are obtained. The corresponding current is copied from the current mirror module, and the digitally controlled temperature coefficient reference current is output by the current adder after the weighting coefficient is adjusted.

[0026] The current adder is connected to the back-end circuit and outputs a reference current with a positive temperature coefficient, a negative temperature coefficient or a zero temperature coefficient according to the current situation required by the back-end circuit.

[0027] A digitally controlled temperature coefficient reference current control and regulation method, the method comprising:

[0028] Step 1: Replicate a positive temperature coefficient reference current and a negative temperature coefficient reference current from a bandgap reference source through two different current mirrors;

[0029] Step 2: inputting the positive temperature coefficient reference current and the negative temperature coefficient reference current into the current adder through different weighted channels respectively;

[0030] Step 3: Calculate the weighting coefficients of the two weighted channels according to the temperature coefficient of the reference current to be output, and control the on / off states of the weighted units in the two weighted channels according to the calculated weighting coefficients, thereby controlling and adjusting the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input to the current adder;

[0031] Step 4: The current adder adjusts the temperature coefficient of the output reference current according to the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input by the two weighted channels.

[0032] The weighted channel includes a plurality of weighted units connected in parallel between the current mirror and the current adder. By controlling the on / off state of each weighted unit, the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input to the current adder is controlled and adjusted.

[0033] The calculation of the weighting coefficient includes:

[0034] The reference positive temperature coefficient reference current output by the bandgap reference source is set to y1=k1x+b1, and the reference negative temperature coefficient reference current is set to y2=k2x+b2, where k1 and k2 represent the slopes of the reference positive temperature coefficient reference current and the reference negative temperature coefficient reference current, respectively, and b1 and b2 represent the intercepts of the reference positive temperature coefficient reference current and the reference negative temperature coefficient reference current, respectively;

[0035] The reference current after passing through the current adder is y=n i y1+m i y2=n i (k1x+b1)+m i (k2x+b2)=K i x+B i , where K i =n i k1+m i k2, B i =n i b1+m i b2, i indicates that the configuration is the i-th configuration state, and the value range of i is: 0~2 N -1,n iRepresents the weighting coefficient of the positive temperature coefficient reference current in the i-th configuration state, m i represents the weighting coefficient of the negative temperature coefficient reference current in the i-th configuration state;

[0036] Set the weighting coefficient to meet the conditions To ensure that the reference current curve under different temperature coefficient configurations has a constant reference current y0 at a certain temperature x0;

[0037] Set the slope K in the i-th configuration state i and intercept B i is an intermediate state to ensure that the slope of the output current curve can be increased or decreased and can be adjusted. The weighting coefficient in the i-th configuration state is determined as

[0038] Set the temperature coefficient reference current slope step to ΔK = K i+1 -K i , then the weight coefficients of different weighting units are

[0039]

[0040] Then, according to the reference positive and negative temperature coefficient reference current slope (k1, k2) and the reference positive and negative temperature coefficient reference current slope intercept (b1, b2) output by the bandgap reference source, the slope of the intermediate configuration state (K i ) and the intercept (B i ), the number of digital control bits (N), the intersection temperature (x0), and the target temperature coefficient reference current slope step (ΔK), and the weighting coefficients of each weighting unit are obtained. The corresponding current is copied from the current mirror module, and the digitally controlled temperature coefficient reference current is output by the current adder after the weighting coefficient is adjusted.

[0041] The present invention has the following advantages: a digitally controlled temperature coefficient reference current control and adjustment circuit and method, which controls the on-off state of each weighted unit through the weighted coefficient of each weighted unit, thereby realizing the adjustment of the output reference current temperature coefficient, so that a reference current with a positive temperature coefficient, a negative temperature coefficient or a zero temperature coefficient can be output from one interface according to actual conditions, thereby reducing the complexity of the overall circuit structure, reducing the number of reference current output interfaces, and realizing flexible adjustment of the output current from a positive temperature coefficient to a negative temperature coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the circuit principle structure of the present invention;

[0043] Figure 2 It is a schematic diagram of the method flow of the present invention;

[0044] Figure 3Configure a schematic diagram for the weighted unit;

[0045] Figure 4 Schematic diagram of output current slope adjustment. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present application provided below in conjunction with the drawings is not intended to limit the scope of protection of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application. The present invention is further described below in conjunction with the drawings.

[0047] like Figure 1 As shown, one embodiment of the present invention relates to a digitally controlled temperature coefficient reference current control and regulation circuit, which includes a bandgap reference source, two current mirrors, multiple weighting units and a current adder; wherein, the bandgap reference source is connected to the two current mirrors, the two current mirrors are respectively connected to multiple weighting units, and all the weighting units are connected to the current adder.

[0048] Furthermore, the bandgap reference source is configured to output a positive temperature coefficient reference current and a negative temperature coefficient reference current to two current mirrors. The first current mirror is configured to replicate the positive temperature coefficient reference current input by the bandgap reference source and input it into the current adder through a plurality of weighting units; the second current mirror is configured to replicate the negative temperature coefficient reference current input by the bandgap reference source and input it into the current adder through a plurality of weighting units. All weighting units connected to the first current mirror are configured to control and adjust the magnitude of the positive temperature coefficient reference current input to the current adder according to the calculated weighting coefficient; all weighting units connected to the second current mirror are configured to control and adjust the magnitude of the negative temperature coefficient reference current input to the current adder according to the calculated weighting coefficient.

[0049] Among them, all weighting units are connected in parallel between two current mirrors and the current adder, and the on-off state of each weighting unit can be controlled and adjusted. Specifically, the channel state of the corresponding weighting unit is controlled according to the calculated weighting coefficient, thereby controlling and adjusting the size of the positive temperature coefficient and / or negative temperature coefficient reference current input into the current adder.

[0050] Further, the current adder is configured to adjust the temperature coefficient of the output reference current according to the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input by the weighting unit. The current adder is connected to the back-end circuit and outputs a reference current with a positive temperature coefficient, a negative temperature coefficient or a zero temperature coefficient according to the current required by the back-end circuit.

[0051] It should be noted that the bandgap reference source, current mirror, weighting unit and current adder involved in the present invention can use existing bandgap reference sources, current mirrors, weighting units and current adders.

[0052] Furthermore, the calculation of the weighting coefficient includes:

[0053] The positive temperature coefficient reference current output by the bandgap reference source is set to y1=k1x+b1, and the negative temperature coefficient reference current is set to y2=k2x+b2, where k1 and k2 represent the slopes of the positive temperature coefficient reference current and the negative temperature coefficient reference current, respectively, and b1 and b2 represent the intercepts of the positive temperature coefficient reference current and the negative temperature coefficient reference current, respectively;

[0054] The reference current after passing through the current adder is y=n i y1+m i y2=n i (k1x+b1)+m i (k2x+b2)=K i x+B i , where K i =n i k1+m i k2, B i =n i b1+m i b2, i indicates that the configuration is the i-th configuration state, and the value range of i is: 0~2 N -1,n i Represents the weighting coefficient of the positive temperature coefficient reference current in the i-th configuration state, m i represents the weighting coefficient of the negative temperature coefficient reference current in the i-th configuration state;

[0055] Set the slope K in the i-th configuration state i and intercept B i is an intermediate state to ensure that the slope of the output current curve can be increased or decreased and can be adjusted. The weighting coefficient in the i-th configuration state is determined as

[0056] Set the weighting coefficient to meet the conditions To ensure that the reference current curves under different temperature coefficients keep the reference current y0 at a certain temperature x0 unchanged;

[0057] Set the temperature coefficient reference current slope step to ΔK = K i+1 -K i , then the weight coefficients of different weighting units are

[0058]

[0059] Then, according to the reference positive and negative temperature coefficient reference current slope (k1, k2) and the reference positive and negative temperature coefficient reference current slope intercept (b1, b2) output by the bandgap reference source, the slope of the intermediate configuration state (K i ) and the intercept (B i ), the number of digital control bits (N), the intersection temperature (x0), and the target temperature coefficient reference current slope step (ΔK), and the weighting coefficients of each weighting unit are obtained. The corresponding current is copied from the current mirror module, and the digitally controlled temperature coefficient reference current is output by the current adder after the weighting coefficient is adjusted.

[0060] The working principle of the present invention is: according to the current situation actually required by the back-end circuit, the weighting coefficients of the weighting units connected to the first current mirror and the second current mirror, that is, the weighting coefficient of the positive temperature coefficient reference current and the weighting coefficient of the negative temperature coefficient reference current are calculated, and the on-off state of each weighting unit connected in parallel with the two current mirrors is controlled and adjusted according to the calculated weighting coefficients, thereby controlling and adjusting the size of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input to the current adder, and finally the current adder adjusts the temperature coefficient of the output reference current according to the size of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input by the two weighted channels.

[0061] like Figure 2 Another embodiment of the present invention relates to a digitally controlled temperature coefficient reference current control and adjustment method, which is implemented according to a digitally controlled temperature coefficient reference current control and adjustment circuit described in the previous embodiment, and specifically includes the following contents:

[0062] Step 1: Replicate a positive temperature coefficient reference current and a negative temperature coefficient reference current from a bandgap reference source through two different current mirrors;

[0063] Step 2: inputting the positive temperature coefficient reference current and the negative temperature coefficient reference current into the current adder through different weighted channels respectively;

[0064] Step 3: Calculate the weighting coefficients of the two weighted channels according to the temperature coefficient of the reference current to be output, and control the on / off states of the weighted units in the two weighted channels according to the calculated weighting coefficients, thereby controlling and adjusting the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input to the current adder;

[0065] Step 4: The current adder adjusts the temperature coefficient of the output reference current according to the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input by the two weighted channels.

[0066] Furthermore, the weighted channel includes a plurality of weighted units connected in parallel between the current mirror and the current adder, and the on-off state of each weighted unit is controlled to thereby control and adjust the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input to the current adder.

[0067] Furthermore, the calculation of the weighting coefficient includes:

[0068] The positive temperature coefficient reference current output by the bandgap reference source is set to y1=k1x+b1, and the negative temperature coefficient reference current is set to y2=k2x+b2, where k1 and k2 represent the slopes of the positive temperature coefficient reference current and the negative temperature coefficient reference current, respectively, and b1 and b2 represent the intercepts of the positive temperature coefficient reference current and the negative temperature coefficient reference current, respectively;

[0069] The reference current after passing through the current adder is y=n i y1+m i y2=n i (k1x+b1)+m i (k2x+b2)=K i x+B i , where K i =n i k1+m i k2, B i =n i b1+m i b2,,i indicates that the configuration is the i-th configuration state, and the value range of i is: 0~2 N -1,n i Represents the weighting coefficient of the positive temperature coefficient reference current in the i-th configuration state, m i represents the weighting coefficient of the negative temperature coefficient reference current in the i-th configuration state;

[0070] Set the slope K in the i-th configuration state i and intercept B i is an intermediate state to ensure that the slope of the output current curve can be increased or decreased and can be adjusted. The weighting coefficient in the i-th configuration state is determined as

[0071] Set the weighting coefficient to meet the conditions To ensure that the reference current curves under different temperature coefficients keep the reference current y0 at a certain temperature x0 unchanged;

[0072] Set the temperature coefficient reference current slope step to ΔK = K i+1 -Ki , then the weight coefficients of different weighting units are

[0073]

[0074] Then, according to the reference positive and negative temperature coefficient reference current slope (k1, k2) and the reference positive and negative temperature coefficient reference current slope intercept (b1, b2) output by the bandgap reference source, the slope of the intermediate configuration state (K i ) and the intercept (B i ), the number of digital control bits (N), the intersection temperature (x0), and the target temperature coefficient reference current slope step (ΔK), and the weighting coefficients of each weighting unit are obtained. The corresponding current is copied from the current mirror module, and the digitally controlled temperature coefficient reference current is output by the current adder after the weighting coefficient is adjusted.

[0075] Furthermore, the steps of the embodiment of the present invention for outputting a digitally controlled temperature coefficient reference current are as follows:

[0076] Step 1: Obtain the reference positive and negative temperature coefficient reference current data output by the bandgap reference source as shown in the following table:

[0077]

[0078]

[0079] Step 2: Set the output reference current temperature slope K in the i-th state i With intercept B i As shown in the following table:

[0080]

[0081] Step 3: Obtain the weighted coefficient n of the output reference based on the reference positive and negative temperature coefficient reference current synthesis in the i-th state i and m i for:

[0082]

[0083] Step 4. Set the target temperature coefficient reference current slope step ΔK = 0.02uA / °C, set the digital control bit number to 4 bits (ie N = 4), set i = 8, and the intersection temperature to 40°C. The weighting coefficients and slope intercepts under different configurations can be calculated from the table below.

[0084]

[0085] Step 5: Set the current mirror replication multiple to obtain the weighted unit replication ratio. The weighted coefficients here can be positive or negative, so the weighted unit can use nmos / pmos current replication to copy the absolute value of the weighted coefficient according to the current flow direction. If the replication multiples of the two current mirrors are set to x1, the weighted unit configuration is as follows: Figure 3 As shown, where Δn = n i+1 -n i , Δm=m i+1 -m i .

[0086] Step 6: Finally, the adder outputs the digital control temperature coefficient reference current, such as Figure 4 As shown, the output current regulation slope range can be adjusted from -0.12625-0.17375 in 16 gears with a step of 0.02uA / °C, and all configuration states intersect at (40°C, 10.5uA).

[0087] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used for various other combinations, modifications and improvements, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A digitally controlled temperature coefficient reference current control and regulation circuit, characterized in that: It includes a bandgap reference source, a current mirror module, a weighting module and a current adder; the bandgap reference source is connected to the current mirror module, the current mirror module is connected to the weighting module, and the weighting module is connected to the current adder; The bandgap reference source is configured to output a positive temperature coefficient reference current and a negative temperature coefficient reference current to the current mirror module; The current mirror module is configured to copy the positive temperature coefficient reference current and the negative temperature coefficient reference current input by the bandgap reference source, and input them into the current adder through the weighting module; The weighting module is configured to control and adjust the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input to the current adder according to the calculated weighting coefficient; The current adder is configured to adjust the temperature coefficient of the output reference current according to the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input by the weighting module.

2. A digitally controlled temperature coefficient reference current control and regulation circuit according to claim 1, characterized in that: The current mirror module includes a first current mirror and a second current mirror; the bandgap reference source is connected to the first current mirror and the second current mirror respectively, and the first current mirror and the second current mirror are connected to the weighting module; The first current mirror is configured to replicate the positive temperature coefficient reference current input by the bandgap reference source and input it into the current adder through the weighting module; The second current mirror is configured to replicate the negative temperature coefficient reference current input by the bandgap reference source and input the copy to the current adder through a weighting module.

3. A digitally controlled temperature coefficient reference current control and regulation circuit according to claim 2, characterized in that: The weighting module comprises a first weighting component and a second weighting component, the first weighting component is connected to the first current mirror and the current adder respectively, and the second weighting component is connected to the second current mirror and the current adder respectively; The first weighting component is configured to control and adjust the magnitude of the positive temperature coefficient reference current input to the current adder according to the calculated weighting coefficient; The second weighting component is configured to control and adjust the magnitude of the negative temperature coefficient reference current input to the current adder according to the calculated weighting coefficient.

4. A digitally controlled temperature coefficient reference current control and regulation circuit according to claim 3, characterized in that: The first weighting component includes N weighting units connected in parallel between the first current mirror and the current adder. Different weighting coefficients are obtained by digitally controlling the on / off state of each weighting unit, thereby controlling and adjusting the size of the positive temperature coefficient reference current input to the current adder.

5. A digitally controlled temperature coefficient reference current control and regulation circuit according to claim 3, characterized in that: The second weighting component includes N weighting units connected in parallel between the second current mirror and the current adder. Different weighting coefficients are obtained by digitally controlling the on / off state of each weighting unit, thereby controlling and adjusting the magnitude of the negative temperature coefficient reference current input to the current adder.

6. A digitally controlled temperature coefficient reference current control and regulation circuit according to any one of claims 1 to 5, characterized in that: The number of weighted coefficient configurations is determined by the number of weighted units, and there are 2 N Configuration states, the calculation includes: The reference positive temperature coefficient reference current output by the bandgap reference source is set to y1=k1x+b1, and the reference negative temperature coefficient reference current output by the bandgap reference source is set to y2=k2x+b2, where k1 and k2 represent the slopes of the reference positive temperature coefficient reference current and the reference negative temperature coefficient reference current, respectively, and b1 and b2 represent the intercepts of the reference positive temperature coefficient reference current and the reference negative temperature coefficient reference current, respectively; The output reference current after current weighting configuration and current adder is y=n i y1+m i y2=n i (k1x+b1)+m i (k2x+b2)=K i x+B i , where K i =n i k1+m i k2, B i =n i b1+m i b2, i indicates that the configuration is the i-th configuration state, and the value range of i is 0 to 2 N -1,n i Represents the weighting coefficient of the positive temperature coefficient reference current in the i-th configuration state, m i represents the weighting coefficient of the negative temperature coefficient reference current in the i-th configuration state; Set the weighting coefficient to meet the conditions To ensure that the reference current y0 of the output reference current curve under different temperature coefficient configurations remains unchanged at a certain temperature x0; Set the slope K in the i-th configuration state i and intercept B i is an intermediate state to ensure that the slope of the output current curve can be increased or decreased and can be adjusted. The weighting coefficient in the i-th configuration state is determined as Set the output reference current temperature coefficient slope configuration step to ΔK = K i+1 -K i , then the weighting coefficients of different weighting units are Then, according to the reference positive and negative temperature coefficient reference current slope and the reference positive and negative temperature coefficient reference current slope intercept output by the bandgap reference source, the slope and intercept of the intermediate configuration state, the number of digital control bits, the intersection temperature, and the target temperature coefficient reference current slope step, the weighting coefficient of each weighting unit is obtained, and the corresponding current is copied from the current mirror module. After the weighting coefficient is adjusted, the digitally controlled temperature coefficient reference current is output by the current adder.

7. A digitally controlled temperature coefficient reference current control and regulation circuit according to claim 6, characterized in that: The current adder is connected to the back-end circuit and outputs a reference current with a positive temperature coefficient, a negative temperature coefficient or a zero temperature coefficient according to the current situation required by the back-end circuit.

8. A digital control temperature coefficient reference current control and adjustment method, characterized in that: The method comprises: Step 1: Replicate a positive temperature coefficient reference current and a negative temperature coefficient reference current from a bandgap reference source through two different current mirrors; Step 2: inputting the positive temperature coefficient reference current and the negative temperature coefficient reference current into the current adder through different weighted channels respectively; Step 3: Calculate the weighting coefficients of the two weighted channels according to the temperature coefficient of the reference current to be output, and control the on / off states of the weighted units in the two weighted channels according to the calculated weighting coefficients, thereby controlling and adjusting the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input to the current adder; Step 4: The current adder adjusts the temperature coefficient of the output reference current according to the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input by the two weighted channels.

9. A digital control temperature coefficient reference current control and adjustment method according to claim 8, characterized in that: The weighted channel includes a plurality of weighted units connected in parallel between the current mirror and the current adder. By controlling the on / off state of each weighted unit, the magnitude of the positive temperature coefficient reference current and / or the negative temperature coefficient reference current input to the current adder is controlled and adjusted.

10. A digital control temperature coefficient reference current control and adjustment method according to claim 8 or 9, characterized in that: The calculation of the weighting coefficient includes: The reference positive temperature coefficient reference current output by the bandgap reference source is set to y1=k1x+b1, and the negative reference temperature coefficient reference current is set to y2=k2x+b2, where k1 and k2 represent the slopes of the reference positive temperature coefficient reference current and the reference negative temperature coefficient reference current, respectively, and b1 and b2 represent the intercepts of the reference positive temperature coefficient reference current and the reference negative temperature coefficient reference current, respectively; The reference current after passing through the current adder is y=n i y1+m i y2=n i (k1x+b1)+m i (k2x+b2)=K i x+B i , where K i =n i k1+m i k2, B i =n i b1+m i b2, i indicates that the configuration is the i-th configuration state, and the value range of i is: 0~2 N -1,n i Represents the weighting coefficient of the positive temperature coefficient reference current in the i-th configuration state, m i represents the weighting coefficient of the negative temperature coefficient reference current in the i-th configuration state; Set the weighting coefficient to meet the conditions To ensure that the reference current curve under different temperature coefficient configurations has a constant reference current y0 at a certain temperature x0; Set the slope K in the i-th configuration state i and intercept B i is an intermediate state to ensure that the slope of the output current curve can be increased or decreased and can be adjusted. The weighting coefficient in the i-th configuration state is determined as Set the temperature coefficient reference current slope step to ΔK = K i+1 -K i , then the weighting coefficients of different weighting units are Then, according to the reference positive and negative temperature coefficient reference current slope and the reference positive and negative temperature coefficient reference current slope intercept output by the bandgap reference source, the slope and intercept of the intermediate configuration state, the number of digital control bits, the intersection temperature, and the target temperature coefficient reference current slope step, the weighting coefficient of each weighting unit is obtained, and the corresponding current is copied from the current mirror module. After the weighting coefficient is adjusted, the digitally controlled temperature coefficient reference current is output by the current adder.

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