TWI585378B - Temperature sensing circuit and its conversion circuit - Google Patents

Description

Temperature sensing circuit and its conversion circuit

The present invention relates to a sensing circuit and a conversion circuit thereof, and more particularly to a temperature sensing circuit and a conversion circuit thereof.

Press, the temperature sensing circuit is used to control a variety of integrated circuit functions, including the update frequency of the dynamic random access memory and the delay time of the delay unit, both of which vary with temperature, and the temperature of the wafer The detector adjusts or changes the frequency of the dynamic random access memory as the temperature changes; similarly, the wafer temperature sensor is also used to adjust or stabilize the variation of the circuit delay time that occurs, the circuit delay time. The stability of the circuit is important to the circuit, depending on the accuracy of the circuit delay required to provide the correct circuit application, such as a circuit delay chain circuit; in addition, the wafer temperature sensing circuit is also implemented Expectations of digital thermometer applications.

Since the temperature sensing circuit occupies part of the integrated circuit with other integrated functions, it is very important that these integrated temperature sensing circuits occupy the smallest wafer area and consume the least amount of wafer power. In addition, for the integrated temperature sensing circuit Other important design parameters are the accuracy of the temperature measurement itself.

Please refer to the first figure, which is a circuit diagram of a temperature sensing circuit of the prior art. As shown, the temperature sensing circuit 9 of the prior art includes a first delay unit 90, a second delay unit 92, and a gate 94. The first delay unit 90 receives an input signal START and delays the input signal START to generate a first delay signal T ₁ . The second delay unit 92 receives the input signal START and delays the input signal START to generate a second delay signal T _{2 .} And the gate 94 receives the first delay signal T ₁ and the second delay signal T ₂ , and logically operates the first delay signal T ₁ and the second delay signal T ₂ to generate a temperature signal T _OT .

Please refer to the second figure together, which is a waveform diagram of a temperature sensing circuit of the prior art. As shown in the figure, the first delay signal T ₁ outputted by the first delay unit 90 fluctuates with temperature fluctuation, and the second delay signal T ₂ output by the second delay unit 92 does not change with temperature fluctuation. Therefore, the difference between the first delay signal T ₁ and the second delay signal T ₂ is a signal containing a temperature factor, that is, the gate 94 is at the level of the first delay signal T ₁ and the second delay signal T _{When the level of 2} is high level, the temperature signal T _OT is generated to know the temperature.

However, the circuit of the second delay unit 92 that does not fluctuate with temperature changes is complicated and costly. Therefore, the temperature sensing circuit of the prior art increases overall by using the second delay unit 92 that does not fluctuate with temperature fluctuations. Circuit area and increase cost.

Therefore, how to solve the above problems and propose a novel temperature sensing circuit and a conversion circuit thereof, which can reduce the overall circuit area and save cost, so that the above problems can be solved.

One of the objects of the present invention is to provide a temperature sensing circuit and a conversion circuit thereof that do not need to use a delay unit that does not vary with temperature fluctuations, thereby reducing the overall circuit area, thereby achieving cost saving.

One of the objectives of the present invention is to provide a temperature sensing circuit and a conversion circuit thereof, which are disposed between an inverter and an output terminal by a capacitor to reduce the overall circuit surface. Accumulate and increase the resolution of temperature sensing.

In order to achieve the above-mentioned various purposes and effects, the present invention discloses a temperature sensing circuit including a first conversion circuit, a counting circuit and a second conversion circuit. The first conversion circuit receives an input signal and delays the input signal according to a temperature to generate a delay signal; the counting circuit receives the delay signal and the input signal, and generates a count data according to the time difference between the delay signal and the input signal according to a clock count; The second conversion circuit receives the count data, and generates a temperature data corresponding to the count data according to a temperature comparison table. Thus, the present invention does not require the use of a delay unit that does not vary with temperature fluctuations, thereby achieving cost saving.

Furthermore, the first conversion circuit of the present invention is a delay circuit, and the delay circuit includes a first transistor, a second transistor and a capacitor. The first end of the first transistor is coupled to a power terminal, and the second end of the first transistor is coupled to one of the output ends of the delay circuit, and one of the first transistors receives the input signal; the second transistor A first end is coupled to the second end of the first transistor and the output end, and a second end of the second transistor is coupled to a ground end, and one of the second transistors receives the input signal; one end of the capacitor is coupled The power terminal is coupled to the first end of the first transistor, and the other end of the capacitor is coupled to the output end, the second end of the first transistor, and the first end of the second transistor. As such, the present invention achieves a reduction in overall circuit area by capacitance and increases resolution of temperature sensing.

In addition, another embodiment of the delay circuit of the present invention may also include a first transistor, a second transistor, and a capacitor. The first end of the first transistor is coupled to a power terminal, and the second end of the first transistor is coupled to one of the output ends of the delay circuit, and one of the first transistors receives the input signal; the second transistor A first end is coupled to the second end of the first transistor and the output end, and a second end of the second transistor is coupled to a ground end, and one of the second transistors receives the input signal; one end of the capacitor is coupled Power terminal and The second end of the transistor, the first end and the output end of the second transistor, and the other end of the capacitor are coupled to the ground end. As such, the present invention achieves a reduction in overall circuit area by capacitance and increases resolution of temperature sensing.

1, 9‧‧‧ Temperature sensing circuit

10‧‧‧First conversion circuit

12, 14‧‧‧Inverter

120‧‧‧First transistor

122‧‧‧Second transistor

20‧‧‧Counting circuit

200‧‧‧ logical unit

202‧‧‧counting unit

30‧‧‧Second conversion circuit

90‧‧‧First delay circuit

92‧‧‧second delay circuit

94‧‧‧ and gate

START‧‧‧Input signal

T ₁ ‧‧‧first delay signal

T ₂ ‧‧‧second delay signal

T _OT ‧‧‧temperature signal

DA, DA1, DA2‧‧‧ delay signal

XR, XR1, XR2‧‧‧ difference signal

CNT, CNT1, CNT2‧‧‧ count data

CLK‧‧‧ clock

C, C1, C2‧‧‧ capacitor

R, R1, R2‧‧‧ resistance

IN‧‧‧ input

OUT‧‧‧ output

V _DD ‧‧‧ power terminal

The first figure is a circuit diagram of a temperature sensing circuit of the prior art.

The second figure is a waveform diagram of a temperature sensing circuit of the prior art.

The third figure is a circuit diagram of a temperature sensing circuit according to an embodiment of the present invention.

The fourth figure is a waveform diagram of a temperature sensing circuit according to a first embodiment of the present invention.

Fig. 5 is a waveform diagram of a temperature sensing circuit according to a second embodiment of the present invention.

Figure 6A is a circuit diagram of a first conversion circuit of a first embodiment of the present invention.

Figure 6B is a circuit diagram of a first conversion circuit of a second embodiment of the present invention.

Figure 6C is a circuit diagram of a first conversion circuit of a third embodiment of the present invention.

Figure 7A is a circuit diagram of a first conversion circuit according to a fourth embodiment of the present invention.

Figure 7B is a circuit diagram of a first conversion circuit according to a fifth embodiment of the present invention.

Figure 7C is a circuit diagram of a first conversion circuit of a sixth embodiment of the present invention.

Figure 8A is a circuit diagram of a first conversion circuit of a seventh embodiment of the present invention.

Figure 8B is a circuit diagram of a first conversion circuit of an eighth embodiment of the present invention.

Figure 8C is a circuit diagram of a first conversion circuit of a ninth embodiment of the present invention.

Figure 9A is a circuit diagram of a first conversion circuit of a tenth embodiment of the present invention.

Figure IXB is a circuit diagram of a first conversion circuit of an eleventh embodiment of the present invention.

Ninth C is a circuit diagram of a first conversion circuit according to a twelfth embodiment of the present invention.

Certain terms are used throughout the description and following claims to refer to particular elements. Those of ordinary skill in the art should understand that a hardware manufacturer may refer to the same component by a different noun. The scope of this specification and the subsequent patent application do not use the difference of the names as the means for distinguishing the elements, but the difference in function of the elements as the criterion for distinguishing. The term "including" as used throughout the specification and subsequent claims is an open term and should be interpreted as "including but not limited to". In addition, the term "coupled" is used herein to include any direct and indirect electrical connection. Therefore, if a first device is coupled to a second device, it means that the first device can be directly electrically connected to the second device or indirectly electrically connected to the second device through other devices or connection means.

In order to provide a better understanding and understanding of the features of the present invention and the efficacies of the present invention, the preferred embodiments and the detailed description are as follows: please refer to the third figure, which is the present invention. A circuit diagram of a temperature sensing circuit of an embodiment. As shown, the temperature sensing circuit 1 of the present invention includes a first conversion circuit 10, a counting circuit 20 and a second conversion circuit 30.

The first conversion circuit 10 receives an input signal START and delays the input signal START according to a temperature to generate a delay signal DA. In the embodiment, the first conversion circuit 10 is a delay circuit. The first conversion circuit 10 will have different delays depending on temperature changes. The delay signal DA of the late time, for example, when the temperature is 30 degrees, the first conversion circuit 10 delays the input signal START after 10 ft (ms), and generates the delay signal DA; when the temperature is 40 degrees, the first conversion circuit 10, after the delayed input signal START is at 20 megaseconds (ms), the delay signal DA is generated. Therefore, the first conversion circuit 10 generates delay signals DA of different delay times according to different temperatures. Therefore, the first conversion circuit 10 can It is called temperature-to-time conversion circuit.

The counting circuit 20 is coupled to the first converting circuit 10, and the counting circuit 20 receives the delay signal DA and the input signal START, and counts the time difference between the delayed signal DA and the input signal START according to a clock CLK to generate a count data CNT. In this case, the counting circuit 20 receives the delay signal DA and the input signal START, and compares the difference between the delay signal DA and the input signal START, and counts the time difference between the delay signal DA and the input signal START according to the clock CLK. The count data CNT is generated. The first conversion circuit 10 delays the generation of the delay signal DA according to different temperatures. Therefore, the counting circuit 20 counts the count data generated by the time difference between the delay signal DA and the input signal START. A message containing temperature.

The second conversion circuit 30 is coupled to the counting circuit 20, and the second conversion circuit receives the count data CNT, and generates a temperature data corresponding to the count data CNT according to a temperature comparison table. That is, the second conversion circuit 30 has a built-in temperature comparison table. The temperature comparison table includes a plurality of count data CNTs, and each of the count data CNTs corresponds to a temperature. For example, when the count data CNT is 20, the corresponding The temperature is 25 degrees, so the temperature data output by the second conversion circuit 30 is 25 degrees; when the count data CNT is 30, the corresponding temperature is 30 degrees, so the temperature data output by the second conversion circuit 30 is 30 degrees. Therefore, the second conversion circuit 30 of the present invention is equivalent to a time-to-temperature conversion circuit. Thus, the present invention does not need to use a delay circuit that does not vary with temperature fluctuations, and Reduce the overall circuit area, and thus achieve cost savings.

In addition, since the temperature corresponding curve of the temperature comparison table can be a linear curve, but not limited thereto, for example, when the count data CNT points are 20, 30, and 40, respectively, the corresponding temperatures are 25 degrees, 30 degrees, and 35 degrees, so the second conversion circuit 30 can use the method of the internal difference operation to know the temperature of the higher resolution, that is, the count data CNT received by the second conversion circuit 30 is not directly in the temperature comparison table. At the corresponding temperature, the second conversion circuit 30 can use the temperature data corresponding to the two count data CNT of the received count data CNT, and use the internal difference calculation method to know the temperature data corresponding to the received count data CNT. For example, the count data CNT in the temperature comparison table is 20, 30, and 40, respectively, and the corresponding temperatures are 25 degrees, 30 degrees, and 35 degrees, respectively. When the count data CNT received by the second conversion circuit 30 is 25, since the temperature data in the temperature comparison table is not corresponding to the temperature of 25, the second conversion circuit 30 can use the internal difference calculation method. First, the two pieces of count data CNT with the closest count data CNT of 25 are 20 and 30, and the temperature data corresponding to 20 and 30 are respectively 25 and 30, and then the internal difference calculation is performed to know that the temperature corresponding to the count data CNT is 25 is 27.5 degrees. . Thus, the present invention can increase the resolution of temperature sensing by means of internal difference operation.

In addition, the counting circuit 20 of the embodiment includes a logic unit 200 and a counting unit 202. The logic unit 200 receives the delay signal DA and the input signal START, and generates a difference signal XR according to the time difference between the delay signal DA and the input signal START (as shown in the fourth figure). In this embodiment, the logic unit 200 is A mutual exclusion or gate, therefore, the difference signal XR generated by the logic unit 200 is the time difference between the delay signal DA and the input signal START. The counting unit 202 is coupled to the logic unit 200, and the counting unit 202 receives the difference signal XR and counts the difference signal XR according to the clock CLK to generate a meter. Number of data CNT.

Please refer to the fourth figure, which is a waveform diagram of the temperature sensing circuit according to the first embodiment of the present invention. As shown, the input signal START is transmitted to the first conversion circuit 10, the first conversion circuit 10 delays the input signal START, generates a delay signal DA, and the logic unit 200 receives the delay signal DA and the input signal START, and performs a logic operation to generate a difference signal. XR, in this embodiment, the logic unit 200 is a mutual exclusion or a gate. Therefore, when the level of the input signal START is a high level and the level of the delay signal DA is a low level, the difference signal XR is accurate. The bit is a high level, so the portion of the high level of the difference signal XR is the time caused by the temperature, and the counting unit 202 generates the count data CNT according to the position of the high level of the difference signal XR according to the clock CLK. It can be equivalent to the time caused by the temperature, and then the temperature corresponding to the count data CNT is found from the temperature comparison table through the second conversion circuit 30. In the present embodiment, the count data CNT is 5, and the temperature of the corresponding count data CNT is In addition, the frequency of the input signal START is smaller than the reciprocal of one of the delay times generated by the first conversion circuit 10, that is, the reciprocal of the time of the count data CNT.

Please refer to FIG. 5, which is a waveform diagram of a temperature sensing circuit according to a second embodiment of the present invention. As shown in the figure, the first embodiment of the present embodiment differs from the embodiment of the fourth embodiment in that the first conversion circuit 10 of the present embodiment generates delay signals DA1 and DA2 at different temperatures, and generates a difference signal XR1 via the logic unit 200. With the difference signal XR2, since the delay time of the temperature to the first conversion circuit 10 is linear, the counting unit 202 counts the difference data CNT1 and CNT2 of the difference signal XR1 and the difference signal XR2 respectively 5 and 10, so that after the second The temperature data generated by the conversion circuit 30 is 17.5 degrees and 20 degrees.

Please refer to FIG. 6A, which is a first conversion circuit of a first embodiment of the present invention. Circuit diagram. As shown in the figure, the first conversion circuit 10 of the present invention is a delay circuit. In this embodiment, the delay circuit includes a delay unit of one stage, and the delay unit includes an inverter 12 and a capacitor C. The input terminal IN of the inverter 12 receives the input signal START and inverts the input signal START; the capacitor C is coupled to the inverter 12, and delays the input signal START after the inverter 12 is inverted according to the temperature to generate a delay signal. DA.

As described above, the inverter 12 includes a first transistor 120 and a second transistor 122. The first end of the first transistor 120 is coupled to a power terminal V _DD , and the second terminal of the first transistor 120 is coupled to an output terminal OUT. The control terminal of the first transistor 120 receives the input signal START. The first end of the second transistor 122 is coupled to the second end of the first transistor 120 and the output end OUT, and the second end of the second transistor 122 is coupled to a ground end. One of the control terminals of the second transistor receives the input signal START. In this embodiment, one end of the capacitor C is coupled to the power terminal V _DD and the first end of the first transistor 120, and the other end of the capacitor C is coupled to the output end OUT, the second end of the first transistor 120, and the second end. The first end of the transistor 122. The capacitor C has a positive temperature coefficient, that is, when the temperature rises, the capacitance of the capacitor C also increases correspondingly. Conversely, when the temperature decreases, the capacitance of the capacitor C also decreases accordingly.

Based on the above, since the present embodiment mainly uses the inverter 12 and uses the capacitor C having a positive temperature coefficient at the output terminal OUT, the mobility of the first transistor 120 and the second transistor 122 when the temperature rises ( Mobility) will decrease, so the equivalent channel resistance value will rise. In addition, since the capacitance C of the output terminal OUT is a positive temperature coefficient, the capacitance value of the capacitor C will also increase with temperature, so the overall first conversion circuit 10 The increase in delay time with temperature rise can be approximated by the capacitance of the channel resistance multiplied by the capacitance C of the output terminal OUT. Conversely, as the temperature drops, the delay time of the first switching circuit 10 decreases as the temperature decreases. Thus, the present invention is provided by the capacitor C Between the inverter 12 and the output terminal OUT, the overall circuit area is reduced, thereby achieving cost saving.

In addition, the positive temperature coefficient described above is not necessarily only referred to as the capacitance C, and the capacitance C can be performed by using MIM, depletion type MOS, and enhanced MOS, and a positive temperature coefficient or a negative temperature coefficient can be achieved. The positive temperature coefficient according to the present invention means that the characteristic of the overall first conversion circuit 10 is a positive temperature coefficient, that is, the characteristic of the combination of the inverter 12 and the capacitance C causes the characteristic of the first conversion circuit 10 to be a positive temperature. coefficient. On the contrary, the negative temperature coefficient also means a negative temperature coefficient as a whole of the first conversion circuit 10.

Please refer to FIG. 6B, which is a circuit diagram of a first conversion circuit according to a second embodiment of the present invention. As shown in the figure, the difference between the embodiment and the embodiment of the sixth embodiment is that the capacitor C of the embodiment is composed of a field-effect transistor, and the capacitor C of the embodiment is also used. The temperature changes and changes.

Please refer to FIG. 6C, which is a circuit diagram of a first conversion circuit according to a third embodiment of the present invention. As shown in the figure, the embodiment differs from the embodiment of the sixth and sixth embodiments in that the first conversion circuit 10 of the embodiment further includes a power pack R. One end of the resistor R is coupled to the second end of the first transistor 120 and the first end of the second transistor 122, and the other end of the resistor R is coupled to the output terminal OUT and the capacitor C. Thus, the resistance R can increase the resistance value of the charge and discharge path.

In addition, since the resistor R can be a poly resistor, a well resistor, a high R poly resistor, or the like formed by different materials, the temperature coefficient thereof may be positive or negative. However, in the present invention, it is necessary to look at the inverter 12 and the capacitor. The first conversion circuit 10, which is integrated with C and the resistor R, has an effect of a positive temperature coefficient or a negative temperature coefficient. Therefore, regardless of the inverter 12, the capacitance C and the resistance R are positive temperature coefficient or negative temperature coefficient, mainly It is to look at the combination of the inverter 12, the capacitor C and the resistor R, whether the effect of the overall first conversion circuit 10 is a positive temperature coefficient or a negative temperature coefficient.

Please refer to FIG. 7A, FIG. 7B and FIG. 7C together, which are respectively circuit diagrams of the first conversion circuit of the fourth, fifth and sixth embodiments of the present invention. As shown, the first conversion circuits of the fourth, fifth, and sixth embodiments respectively correspond to the first conversion circuits of the first, second, and third embodiments, and the first conversion circuits of the first, second, and third embodiments, respectively. The difference is that one end of the capacitor C of the first conversion circuit of the fourth, fifth and sixth embodiments is coupled to the power terminal V _DD and the second end of the first transistor 120 and the first end of the second transistor 122 The output terminal OUT and the other end of the capacitor C are coupled to the ground. The operation principle is the same as that of the first conversion circuit 10 of the first embodiment, and details are not described herein.

Please refer to FIGS. 8A to 8C together, which are circuit diagrams of the first conversion circuits of the seventh, eighth and ninth embodiments, respectively. As shown, the first conversion circuit 10 of the seventh, eighth and ninth embodiments is different from the first conversion circuit 10 of the first, second and third embodiments in the first of the seventh, eighth and ninth embodiments. The conversion circuit 10 further includes a first-stage inverter 14 and a capacitor C2 to increase the delay time of the first conversion circuit 10. The structure is the same as that of the first conversion circuit 10 of the first, second and third embodiments, and thus Let me repeat them.

Based on the above, the first conversion circuit 10 of the present invention can be a second-order or even a multi-stage delay unit in addition to the one-stage delay unit.

Please refer to the ninth to fifth ninth C drawings, which are circuit diagrams of the first conversion circuits of the tenth, eleventh and twelfth embodiments, respectively. As shown, the first conversion circuit 10 of the tenth, eleventh and twelfth embodiments and the first conversion circuit 10 of the fourth, fifth and sixth embodiments The difference is that the first conversion circuit 10 of the tenth, eleventh and twelfth embodiments further includes the inverter 14 and the capacitor C2 of the first stage to increase the delay time of the first conversion circuit 10, and the structure thereof is the same as the fourth The fifth and sixth embodiments of the first conversion circuit 10 are the same and will not be described again.

In summary, the present invention relates to a temperature sensing circuit and a conversion circuit thereof. The temperature sensing circuit receives an input signal from the first conversion circuit, and delays the input signal according to a temperature to generate a delay signal; The circuit receives the delay signal and the input signal, and generates a count data according to the time difference between the clock delay signal and the input signal; and a second conversion circuit receives the count data, and generates a temperature data corresponding to the count data according to a temperature comparison table. . Thus, the present invention does not need to use a delay unit that does not vary with temperature fluctuations, and reduces the overall circuit area, thereby achieving cost saving.

1‧‧‧Temperature sensing circuit

10‧‧‧First conversion circuit

20‧‧‧Counting circuit

200‧‧‧ logical unit

202‧‧‧counting unit

30‧‧‧Second conversion circuit

START‧‧‧Input signal

DA‧‧‧delay signal

XR‧‧‧ difference signal

CNT‧‧‧counting data

CLK‧‧‧ clock

Claims (9)

A temperature sensing circuit includes: a first conversion circuit that receives an input signal and delays the input signal according to a temperature to generate a delay signal; a counting circuit receives the delayed signal and the input signal, and according to a clock counts the time difference between the delay signal and the input signal to generate a count data; and a second conversion circuit receives the count data and generates a temperature data corresponding to the count data according to a temperature comparison table; wherein the input The frequency of the signal is less than a reciprocal of a delay time in which the input signal is delayed; wherein the first conversion circuit includes a delay unit, the delay unit includes an odd-numbered inverter, and the delay unit includes: a first transistor, A first end is coupled to a power terminal, and a second end of the first transistor is coupled to an output end of the delay unit, and one of the first transistors receives the input signal; a second transistor The first end is coupled to the second end of the first transistor and the output end, and the second end of the second transistor is coupled to a ground end, the second One of the control terminals receives the input signal; and a capacitor having one end coupled to the power terminal and the first end of the first transistor, the other end of the capacitor coupled to the output terminal, the first transistor The second end is opposite the first end of the second transistor. Temperature sensing electricity as described in claim 1 The circuit further includes: a resistor having one end coupled to the second end of the first transistor and the first end of the second transistor, the other end of the resistor coupled to the output end The capacitor. A temperature sensing circuit includes: a first conversion circuit that receives an input signal and delays the input signal according to a temperature to generate a delay signal; a counting circuit receives the delayed signal and the input signal, and according to a clock counts the time difference between the delay signal and the input signal to generate a count data; and a second conversion circuit receives the count data and generates a temperature data corresponding to the count data according to a temperature comparison table; wherein the input The frequency of the signal is less than a reciprocal of a delay time in which the input signal is delayed; wherein the first conversion circuit includes a delay unit, the delay unit includes an odd-numbered inverter, and the delay unit includes: a first transistor, A first end is coupled to a power terminal, and a second end of the first transistor is coupled to an output end of the delay unit, and one of the first transistors receives the input signal; a second transistor The first end is coupled to the second end of the first transistor and the output end, and the second end of the second transistor is coupled to a ground end, the second One body control terminal for receiving the input signal; and a capacitor having one end coupled to the second terminal of the first transistor, the second electrical The first end of the crystal is coupled to the output end, and the other end of the capacitor is coupled to the ground end. The temperature sensing circuit of claim 3, wherein the delay circuit further comprises: a resistor coupled to the second end of the first transistor and the first end of the second transistor The other end of the resistor is coupled to the output terminal and the capacitor. The temperature sensing circuit of claim 1 or 3, wherein the counting circuit comprises: a logic unit, receiving the delay signal and the input signal, and according to a time difference between the delay signal and the input signal, Generating a difference signal; and a counting unit, receiving the difference signal, and counting the difference signal according to the clock to generate the counting data. A conversion circuit for a temperature sensing circuit, comprising: an inverter that receives an input signal and inverts the input signal; and a capacitor coupled to the inverter, and the capacitance of the capacitor is based on a temperature Changing, to delay the input signal after the inverter is inverted, generating a delay signal; wherein the frequency of the input signal is less than a reciprocal of a delay time delayed by the input signal, the capacitor being a sensing component, The sensing element has a positive temperature coefficient or a negative temperature coefficient; wherein the inverter comprises: a first transistor, a first end of which is coupled to the first a second end of the first transistor is coupled to an output end of the inverter, a control end of the first transistor receives the input signal; and a second transistor has a first end The second end of the second transistor is coupled to the ground end, and the second end of the second transistor is coupled to the ground. The control terminal receives the input signal. One end of the capacitor is coupled to the power terminal and the first end of the first transistor, and the other end of the capacitor is coupled to the output end, the second end of the first transistor, and the first end of the second transistor end. The conversion circuit of claim 6, further comprising: a resistor, one end of which is coupled to the second end of the first transistor and the first end of the second transistor, and the resistor is further One end is coupled to the output terminal and the capacitor. A conversion circuit for a temperature sensing circuit, comprising: an inverter that receives an input signal and inverts the input signal; and a capacitor coupled to the inverter, and the capacitance of the capacitor is based on a temperature Changing, to delay the input signal after the inverter is inverted, generating a delay signal; wherein the frequency of the input signal is less than a reciprocal of a delay time delayed by the input signal, the capacitor being a sensing component, The sensing element has a positive temperature coefficient or a negative temperature coefficient; wherein the inverter comprises: a first transistor, a first end of which is coupled to a power terminal, the first transistor One of the first ends is coupled to the output of one of the inverters, and one of the first transistors receives the input signal; and a second transistor is coupled to the first transistor The second end is coupled to the ground end, and the second end of the second transistor is coupled to the ground. The control terminal receives the input signal. The one end of the capacitor is coupled to the first end. The second end of the transistor, the first end of the second transistor, and the output end, the other end of the capacitor is coupled to the ground. The conversion circuit of claim 8, further comprising: a resistor coupled to the second end of the first transistor and the first end of the second transistor, the other end of the resistor One end is coupled to the output terminal and the capacitor.