TWI841958B - Temperature measurement circuit and method - Google Patents

Abstract

Disclosed are a temperature measurement circuit and method. The circuit includes a first temperature sensing circuit, a second temperature sensing circuit and a data processing unit. The first temperature sensing circuit is configured to generate a first measurement signal for characterizing a temperature based on an inputted first current signal, a magnitude of the first current signal being correlated to temperature. The second temperature sensing circuit is configured to generate a second measurement signal for characterizing the temperature based on an inputted second current signal, the second current signal being independent of temperature. The data processing unit is configured to determine a current temperature based on a first characteristic parameter corresponding to the first measurement signal and a second characteristic parameter corresponding to the second measurement signal. Linearity of the temperature measurement circuit when measuring temperature and accuracy of temperature measurement results can be improved.

Description

Temperature measurement circuit and method

The present invention relates to the field of temperature measurement technology, and in particular to a temperature measurement circuit and method.

Temperature control is often required in circuits. Temperature measurement circuits using high-end analog-to-digital converters (ADCs) occupy a large area and are difficult to lay out. In addition, temperature measurement circuits often have the disadvantages of inaccurate temperature measurements and nonlinear performance.

This invention content section is provided to introduce the concepts in a concise form, which will be described in detail in the specific implementation section below. This invention content section is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to be used to limit the scope of the technical solution claimed for protection.

The present invention provides a temperature measurement circuit and method.

In the first aspect, an embodiment of the present invention provides a temperature measurement circuit, comprising: a first temperature sensing circuit, a second temperature sensing circuit, and a data processing unit; the first temperature sensing circuit is used to generate a first measurement signal for indicating temperature according to an input first current signal, and the magnitude of the first current signal is related to the temperature; the second temperature sensing circuit is used to generate a second measurement signal for indicating temperature according to an input second current signal, and the second current signal is independent of the temperature; the output end of the first temperature sensing circuit and the output end of the second temperature sensing circuit are both connected to the input end of the data processing unit; the data processing unit is used to determine the current temperature according to a first characteristic parameter corresponding to the first measurement signal and a second characteristic parameter corresponding to the second measurement signal; wherein the circuit parameters of the first temperature sensing circuit are the same as the circuit parameters of the second temperature sensing circuit.

In the second aspect, an embodiment of the present invention provides a temperature measurement method, which is used in a data processing unit in the temperature measurement circuit described in the first aspect, wherein the temperature measurement circuit includes a first temperature sensing circuit and a second temperature sensing circuit, and the method includes: receiving a first measurement signal output by the first temperature sensing circuit and a second measurement signal output by the second temperature sensing circuit; wherein the input signal of the first temperature sensing circuit is a first current signal, the magnitude of which is related to the temperature; the second temperature sensing circuit inputs a second current signal, which is independent of the temperature; extracting a first characteristic parameter corresponding to the first measurement signal and a second characteristic parameter corresponding to the second measurement signal; and determining the current temperature of the environment in which the temperature measurement circuit is located according to the first characteristic parameter and the second characteristic parameter.

The temperature measurement circuit and method provided by the embodiment of the present invention, by setting a first temperature sensing circuit and a second temperature sensing circuit with the same circuit parameters, input a first current signal and a second current signal to the first temperature sensing circuit and the second temperature sensing circuit respectively, the magnitude of the first current signal is related to the temperature, and the magnitude of the second current signal is independent of the temperature. The second measurement signal output by the second temperature sensing circuit is used to eliminate the influence of the circuit parameters in the first temperature sensing circuit in the first measurement signal output by the first temperature sensing circuit, so that the linearity of the temperature measurement result of the above temperature measurement circuit is better and the accuracy is higher.

10, 20: Temperature measurement circuit

11, 21: First temperature sensing circuit

12, 22: Second temperature sensing circuit

13, 23: Data processing unit

211: The first ring oscillator

221: Second ring oscillator

24: PTAT current source

25: Constant current source

301, 302, 303: Steps

The above and other features, advantages and aspects of the various embodiments of the present invention will become more apparent in conjunction with the accompanying drawings and with reference to the following specific embodiments. Throughout the accompanying drawings, the same or similar figure markings represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

Figure 1 is a schematic diagram of the structure of some embodiments of the temperature measurement circuit provided by the present invention.

Figure 2 is a schematic diagram of the structure of some other embodiments of the temperature measurement circuit provided by the present invention.

Figure 3 is a schematic diagram of the process of some embodiments of the temperature measurement method provided by the present invention.

The following will describe the embodiments of the present invention in more detail with reference to the accompanying drawings. Although the accompanying drawings show certain embodiments of the present invention, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided for a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

It should be understood that the various steps described in the method implementation of the present invention may be performed in different orders and/or in parallel. In addition, the method implementation may include additional steps and/or omit the steps shown. The scope of the present invention is not limited in this respect.

The term "including" and its variations used in this article 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". The relevant definitions of other terms will be given in the following description.

It should be noted that the concepts of "first" and "second" mentioned in the present invention 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.

It should be noted that the modifiers "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

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

Please refer to Figure 1, which shows a schematic diagram of the structure of some embodiments of the temperature measurement circuit according to the present invention. As shown in Figure 1, the temperature measurement circuit 10 includes:

A first temperature sensing circuit 11, a second temperature sensing circuit 12, and a data processing unit 13.

The first temperature sensing circuit 11 is used to generate a first measurement signal for indicating temperature according to the input first current signal. The magnitude of the first current signal is related to the temperature. The first measurement signal is related to the temperature and the circuit parameters of the first temperature sensing circuit.

The second temperature sensing circuit 12 is used to generate a second measurement signal for indicating temperature according to the input second current signal. The second current signal is independent of the temperature, and the second measurement signal is related to the circuit parameters of the second temperature sensing circuit.

The output end of the first temperature sensing circuit 11 and the output end of the second temperature sensing circuit 12 are both connected to the input end of the data processing unit 13.

The data processing unit 13 is used to determine the current temperature according to the first characteristic parameter corresponding to the first measurement signal and the second characteristic parameter corresponding to the second measurement signal; wherein the circuit parameters of the first temperature sensing circuit are the same as the circuit parameters of the second temperature sensing circuit.

In some application scenarios, the temperature measurement circuit can be applied to the integrated circuit design to detect the temperature of the integrated circuit when it is working. In these application scenarios, the temperature measurement circuit can be a temperature detection circuit module fixedly installed in the integrated circuit.

The first measurement signal may be a first period oscillation signal, and the first characteristic parameter may be, for example, the first frequency of the first period oscillation signal.

The second measurement signal may be a second period oscillation signal, and the second characteristic parameter may be, for example, the second frequency of the second period oscillation signal.

The first frequency may be related to the current temperature and the circuit parameters of the first temperature sensing circuit, and the second frequency may be related to the circuit parameters of the second temperature sensing circuit.

The circuit parameters of the first temperature sensing circuit and the second temperature sensing circuit are the same. For example, the same components required for the first temperature sensing circuit and the second temperature sensing circuit can be manufactured using the same manufacturing process.

Since the circuit parameters of the first temperature sensing circuit 11 and the second temperature sensing circuit 12 are the same, for the input current signal, the output signal generated by the circuit parameters of the first temperature sensing circuit for the first current signal input thereto, and the output signal generated by the circuit parameters of the second temperature sensing circuit for the second current signal input thereto can be approximately considered the same.

The second measurement signal generated by the second temperature sensing circuit for the second current signal can be used to remove the output signal generated by the circuit parameters in the first temperature sensing circuit for the circuit signal in the first measurement signal. The remaining first measurement signal is only related to the first current signal. The first current signal is a signal related to temperature. Therefore, the remaining first measurement signal can also be regarded as only related to temperature. The temperature of the environment in which the temperature measurement circuit is located can be determined by the remaining first measurement signal.

The temperature measurement circuit provided in this embodiment is configured with a first temperature sensing circuit and a second temperature sensing circuit having the same circuit parameters, and the first current signal and the second current signal are input to the first temperature sensing circuit and the second temperature sensing circuit respectively, the magnitude of the first current signal is related to the temperature, and the magnitude of the second current signal is independent of the temperature, and the second measurement signal output by the second temperature sensing circuit is used to eliminate the influence of the circuit parameters in the first temperature sensing circuit in the first measurement signal output by the first temperature sensing circuit, so that the temperature obtained by the above temperature measurement circuit can improve the linearity of the measurement result of the temperature measurement circuit, and at the same time, can improve the accuracy of the temperature measurement result.

Please refer to Figure 2, which shows a schematic diagram of the structure of another embodiment of the temperature measurement circuit provided by the present invention.

Compared with the embodiment shown in FIG1 , as shown in FIG2 , the temperature measurement circuit 20 includes a first temperature sensing circuit 21, a second temperature sensing circuit 22, a data processing unit 23, a PTAT current source 24, and a constant current source 25.

The PTAT (Proportional To Absolute Temperature) current source 24 refers to a current source in which the output current is proportional to the absolute temperature (unit: Kelvin).

That is to say, the relationship between the current I (unit: ampere) output by the PTAT current source 24 and the ambient temperature T (unit: Kelvin) satisfies I=A×T (A is a fixed constant). The current output by the PTAT current source 24 can be regarded as the PTAT current. The implementation circuit of the PTAT current source 24 here can be various existing PTAT current source implementation circuits.

In some application scenarios, when the temperature measurement circuit is applied to measure the integrated circuit field, the PTAT current source 24 can be in the integrated circuit. The PTAT current source 24 can be set in the integrated circuit in the form of a sub-circuit as the core unit of the temperature sensor. Since its output current is proportional to the absolute temperature, the current output current of the PTAT current source 24 can be used to reflect the current ambient temperature through a certain mechanism.

The above-mentioned PTAT current source 24 is used to generate a first current signal whose magnitude varies with temperature.

The output end of the PTAT current source 24 is connected to the input end of the first temperature sensing circuit, and is used to input the first current signal to the first temperature sensing circuit.

The above-mentioned constant current source 25 can be composed of a PTAT current source and a CTAT (Complementary to Absolute Temperature) circuit. The above-mentioned CTAT circuit is a circuit that generates a negative temperature coefficient. That is, the magnitude of the current generated by the circuit is negatively related to the temperature. In some application scenarios, the above-mentioned constant current source can be composed of the above-mentioned PTAT current source 24 and a CTAT circuit. For example, the first current signal output by the above-mentioned PTAT current source is input into the above-mentioned CTAT circuit, and the above-mentioned CTAT circuit outputs a second current signal that does not change with temperature.

In this embodiment, the CTAT circuit can use various existing CTAT implementation circuits.

The PTAT current source 24 outputs a first current signal positively correlated with temperature under the stimulation of the voltage signal.

The above CTAT circuit outputs a calibration current signal that is negatively correlated with temperature and is used for calibration when stimulated by a voltage signal.

The calibration current signal and the first current signal may be assigned a first weight and a second weight respectively. The second current signal is determined by multiplying the calibration signal by the first weight and the first current signal by the second weight. For example, the sum of the product of the calibration signal and the first weight and the product of the first current signal and the second weight is taken as the second current signal.

By using the above-mentioned PTAT current source 24 and the above-mentioned CTAT circuit, a constant current signal (second current signal) that does not change with temperature can be obtained.

The second temperature sensing circuit may be a copy of the first temperature sensing circuit. Specifically, the circuit structure of the second temperature sensing circuit may be the same as the circuit structure of the first temperature sensing circuit. The component parameters of each component used in the circuit structure of the second temperature sensing circuit may be the same as the component parameters of the corresponding component in the circuit structure of the second temperature sensing circuit.

In this embodiment, the first temperature sensing circuit 21 includes a first ring oscillator 211. The second temperature sensing circuit 22 includes a second ring oscillator 221. The signal input end of the first ring oscillator 211 is connected to the output end of the PTAT current source 24. The signal input end of the second ring oscillator 221 is connected to the output end of the constant current signal source 25.

The first ring oscillator 211 and the second ring oscillator 221 may each include an odd number of inverters. The first ring oscillator 211 and the second ring oscillator 221 each include the same number of inverters. Furthermore, the parameters of each inverter in the first ring oscillator may be the same as the parameters of the corresponding inverter in the second ring oscillator. The parameters of the inverters here may include, for example, the size of the capacitor.

The first ring oscillator 211 can generate a first oscillating current signal according to the input first current signal. The first oscillating current signal here can be a first measurement signal. The first oscillating current signal is a first cycle pulse signal. The frequency of the first cycle pulse signal can be related to the magnitude of the first current signal.

The second ring oscillator 221 can generate a second oscillating current signal according to the input second current signal. The second oscillating current signal here can be a second measurement signal. The oscillation frequency of the second oscillating current signal is related to the second current signal.

The second current signal can be generated by the constant current source 25. In some application scenarios, the signal input terminal of the PTAT current source 24 and the signal input terminal of the constant current source 25 can input the same excitation signal. In other application scenarios, in these application scenarios, the PTAT current source constituting the constant current source can be a copy of the PTAT current source that generates the first current signal.

In some other application scenarios, the above-mentioned constant current source can be composed of a PTAT current source that generates a first current signal and a CTAT circuit. That is, in these application scenarios, the above-mentioned second current signal can be generated after the above-mentioned first current signal flows through the CTAT circuit.

In the above two application scenarios, the second current signal and the first current signal have the following relationship: the first current signal generated by the PTAT current source can be recorded as Iptat. The current signal generated by the constant current source can be recorded as Iabs.

Iptat = a × T (1); a is a constant and T is the absolute temperature.

The relationship between the second current signal and the first current signal can be expressed by the following formula: Iabs = Iptat + △Iptat (2); △Iptat is the difference between Iptat and Iabs. Since Iabs does not change with temperature, but Iptat changes with temperature, △Iptat changes with temperature.

The first characteristic parameter (ie, the first oscillation frequency) of the first measurement signal output by the first ring oscillator 211 under the action of the first current signal can be: F1 = Fabs + b ×△ Iptat (3); where b is a constant.

The second characteristic parameter (i.e., the second oscillation frequency) of the second measurement signal output by the second ring oscillator 221 under the action of the second current signal can be Fabs.

F2=Fabs (4); Formula (4) can be used to subtract Formula (3) to obtain the temperature measurement frequency F3: F3=F1-F2= b × △Iptat = b × a' × T = b' × T (5); Using Formula (5) to determine the temperature can eliminate the impact of the circuit parameters in the ring oscillator on the results. This can improve the linearity of the test results.

In practice, the relationship curve between temperature and temperature measurement frequency F3 can be calibrated according to formula (5) to determine the value of b' . When actually measuring temperature, the current temperature T can be determined according to the temperature measurement frequency F3 output by the above temperature measurement circuit.

The temperature measurement circuit provided in this embodiment provides a PTAT current source and a constant current source in the temperature measurement circuit, inputs the PTAT current into the first ring oscillator to obtain a first measurement signal, inputs the second current signal output by the constant current source into the second ring oscillator to obtain a second measurement signal, determines the first oscillation frequency according to the first measurement signal, determines the second oscillation frequency according to the second measurement signal, extracts only the temperature-related temperature measurement frequency from the first oscillation frequency using the second oscillation frequency, and determines the temperature using the temperature measurement frequency, thereby obtaining a more accurate measurement result.

Reference is made to FIG3 below, which shows a schematic diagram of the process flow of some embodiments of the temperature measurement method according to the present invention. The temperature measurement method is used in the data processing unit of the temperature measurement circuit shown in FIG1.

The circuit measurement circuit includes a first temperature sensing circuit and a second temperature sensing circuit. The temperature measurement method includes the following steps.

Step 301, receiving a first measurement signal output by a first temperature sensing circuit and a second measurement signal output by a second temperature sensing circuit.

The input signal of the first temperature sensing circuit is a first current signal, and the magnitude of the first current signal is related to the temperature. The first measurement signal is related to both the temperature and the circuit parameters of the first temperature sensing circuit.

The second temperature sensing circuit inputs a second current signal, and the second current signal is independent of temperature. The second measurement signal is related to the circuit parameters of the second temperature sensing circuit.

The first temperature sensing circuit and the second temperature sensing circuit have the same corresponding circuit parameters.

Step 302, extracting the first characteristic parameter corresponding to the first measurement signal and the second characteristic parameter corresponding to the second measurement signal.

Step 303, determining the current temperature of the environment in which the temperature measurement circuit is located based on the first characteristic parameter and the second characteristic parameter.

Specifically, the part that is the same as the second characteristic parameter can be taken out from the first characteristic parameter, and the current temperature of the environment in which the temperature measurement circuit is located can be determined based on the remaining characteristic parameters.

The remaining characteristic parameters here are only related to temperature.

In some application scenarios, the temperature measurement circuit includes a PTAT current source and a constant current source. The first temperature sensing circuit includes a first ring oscillator, and the second temperature sensing circuit includes a second ring oscillator. The signal input terminal of the first ring oscillator is connected to the output terminal of the PTAT current source; the signal input terminal of the second ring oscillator is connected to the output terminal of the constant current source; the first ring oscillator and the second ring oscillator respectively include the same number of inverters. The first ring oscillator and the second ring oscillator each include an odd number of inverters. The second ring oscillator can be a mirror image of the first ring oscillator.

The parameters of the inverters corresponding to the first ring oscillator and the second ring oscillator are the same.

The first measurement signal may be a first period oscillation signal output by the first ring oscillator. The second measurement signal may be a second period oscillator signal output by the second ring oscillator. The first period oscillation signal is a period pulse signal. The second period oscillation signal is also a period pulse signal. The above step 302 may include: extracting a first oscillation frequency from the first measurement signal as a first characteristic parameter. Extracting a second oscillation frequency from the second measurement signal as a second characteristic parameter.

The first oscillation frequency may be related to temperature and circuit parameters of the first ring oscillator.

The second oscillation frequency is related to the circuit parameters of the second ring oscillator.

The first ring oscillator and the second ring oscillator have the same circuit parameters. The first ring oscillator and the second ring oscillator each include the same number of inverters. The first ring oscillator and the second ring oscillator each include an odd number of inverters.

In these application scenarios, the above step 303 further includes the following steps:

First, the second characteristic parameter is used to extract only the characteristic parameters related to temperature from the first characteristic parameter.

Secondly, the current temperature is determined using some characteristic parameters related only to temperature.

Specifically, the first current signal generated by the PTAT current source can be recorded as Iptat. The current signal generated by the constant current source can be recorded as Iabs.

Iptat = a × T (6); a is a constant and T is the absolute temperature.

The relationship between the second current signal and the first current signal can be expressed by the following formula: Iabs = Iptat + △Iptat (7); △Iptat is the difference between Iptat and Iabs. Since Iabs does not change with temperature, but Iptat changes with temperature, △Iptat changes with temperature.

The first characteristic parameter (first oscillation frequency) of the first measurement signal output by the first ring oscillator under the action of the first current signal can be: F1 = Fabs + b × △Iptat (8); where b is a constant.

The second characteristic parameter (second oscillation frequency) of the second measurement signal output by the second ring oscillator under the action of the second current signal can be Fabs.

F2=Fabs (9); Formula (9) can be used to subtract formula (8) to obtain the temperature measurement frequency F3: F3=F1-F2= b × △Iptat = b × a' × T = b'×T (10); Using formula (10) to determine the temperature can eliminate the impact of the circuit parameters in the ring oscillator on the results, thereby improving the linearity of the test results.

In practice, the relationship curve between temperature and temperature measurement frequency F3 can be calibrated according to formula (10) to determine the value of b' . When actually measuring temperature, the current temperature T of the environment in which the temperature measurement circuit is located can be determined according to the temperature measurement frequency output by the above temperature measurement circuit.

The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the disclosure scope involved in the present invention is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above invention concept. For example, the above features and the technical features disclosed in the present invention (but not limited to) with similar functions are replaced with each other to form a technical solution.

Furthermore, although the operations are depicted in a particular order, this should not be understood as requiring that the operations be performed in the particular order shown or in a sequential order. In certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the invention. Certain features described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination.

Although the subject matter has been described using language specific to structural features and/or methodological logic acts, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely example forms of implementing the claims.

10: Temperature measurement circuit

11: First temperature sensing circuit

12: Second temperature sensing circuit

13: Data processing unit

Claims (10)

A temperature measurement circuit includes: a first temperature sensing circuit, a second temperature sensing circuit, and a data processing unit, wherein the first temperature sensing circuit is used to generate a first measurement signal for indicating temperature according to an input first current signal, and the magnitude of the first current signal is related to the temperature, and the second temperature sensing circuit is used to generate a second measurement signal for indicating temperature according to an input second current signal, and the second current signal is independent of the temperature, and the output end of the first temperature sensing circuit, the second temperature sensing circuit and the data processing unit are connected to each other. The output ends of the sensing circuit are connected to the input ends of the data processing unit, and the data processing unit is used to determine the current temperature according to the first characteristic parameter corresponding to the first measurement signal and the second characteristic parameter corresponding to the second measurement signal, and the circuit parameters of the first temperature sensing circuit are the same as the circuit parameters of the second temperature sensing circuit; wherein the first measurement signal is related to the temperature and the circuit parameters of the first temperature sensing circuit, and the second measurement signal is related to the circuit parameters of the second temperature sensing circuit. A temperature measurement circuit as described in claim 1, wherein the temperature measurement circuit further includes a PTAT current source and a constant current source that are proportional to the absolute temperature, the PTAT current source is used to generate a first current signal whose magnitude varies with temperature, the constant current source is used to generate a second current source whose magnitude is constant, the output end of the PTAT current source is connected to the input end of the first temperature sensing circuit, the output end of the constant current source is connected to the input end of the second temperature sensing circuit. A temperature measurement circuit as described in claim 2, wherein the constant current source is composed of the PTAT current source and an absolute temperature compensation circuit. The temperature measurement circuit as described in claim 2, wherein the first temperature sensing circuit includes a first ring oscillator, the second temperature sensing circuit includes a second ring oscillator, the signal input terminal of the first ring oscillator is connected to the output terminal of the PTAT current source, and the signal input terminal of the second ring oscillator is connected to the output terminal of the constant current source. The temperature measurement circuit as described in claim 4, wherein the first measurement signal is a first period oscillation signal generated by the first ring oscillator according to the first current signal, the second measurement signal is a second period oscillation signal generated by the second ring oscillator according to the second current signal, the first characteristic parameter is a first oscillation frequency, the second characteristic parameter is a second oscillation frequency, and the data processing unit is used to determine the current temperature according to the first oscillation frequency of the first period oscillation signal and the second oscillation frequency of the second period oscillation signal. A temperature measurement circuit as described in claim 4, wherein the first ring oscillator and the second ring oscillator each include an odd number of inverters. A temperature measurement circuit as described in claim 6, wherein the first ring oscillator and the second ring oscillator each include an equal number of inverters. A temperature measurement circuit as described in claim 1, wherein the second temperature sensing circuit is a mirror image circuit of the first temperature sensing circuit. A temperature measurement method is used in a data processing unit in a temperature measurement circuit as described in any one of claims 1 to 8, wherein the temperature measurement circuit includes a first temperature sensing circuit and a second temperature sensing circuit, and the method includes: receiving a first measurement signal output by the first temperature sensing circuit and a second measurement signal output by the second temperature sensing circuit, wherein the input signal of the first temperature sensing circuit is a first current signal, the magnitude of the first current signal is related to the temperature, and the second temperature sensing circuit inputs a second current signal, and the second current signal is independent of the temperature; extracting a first characteristic parameter corresponding to the first measurement signal and a second characteristic parameter corresponding to the second measurement signal; and determining the current temperature of the environment in which the temperature measurement circuit is located according to the first characteristic parameter and the second characteristic parameter. A method as described in claim 9, wherein the temperature measurement circuit includes a PTAT current source and a constant current source that are proportional to the absolute temperature, the first temperature sensing circuit includes a first ring oscillator, the second temperature sensing circuit includes a second ring oscillator, the signal input end of the first ring oscillator is connected to the output end of the PTAT current source, the signal input end of the second ring oscillator is connected to the output end of the constant current source, the first measurement signal is a first period oscillation signal, the second measurement signal is a second period oscillation signal, and the first measurement signal corresponding to the second period oscillation signal is extracted. The step of determining a characteristic parameter and a second characteristic parameter corresponding to the second measurement signal further includes: extracting a first oscillation frequency from the first period oscillation signal as a first characteristic parameter, and extracting a second oscillation frequency from the second period oscillation signal as a second characteristic parameter; the step of determining the current temperature of the environment in which the temperature measurement circuit is located based on the first characteristic parameter and the second characteristic parameter further includes: extracting only a portion of characteristic parameters related to temperature from the first characteristic parameter using the second characteristic parameter; and determining the current temperature using only a portion of characteristic parameters related to temperature.