CN212391136U - High-sensitivity absolute temperature measuring circuit - Google Patents
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- CN212391136U CN212391136U CN202022179711.3U CN202022179711U CN212391136U CN 212391136 U CN212391136 U CN 212391136U CN 202022179711 U CN202022179711 U CN 202022179711U CN 212391136 U CN212391136 U CN 212391136U
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Abstract
The utility model discloses a high-sensitivity absolute temperature measuring circuit, which comprises two drain electrodes, a grid electrode short-circuit thin film transistor, a power supply for biasing the two thin film transistors and an external differential amplifier; and two input ends of the differential amplifier are respectively connected with the grid source voltages of the two thin film transistors, and the grid source voltages of the two thin film transistors are output after differential amplification processing. The power supply can adopt a constant voltage source or a constant current source, and the thin film transistor can be of a single-gate or double-gate structure. The temperature sensor circuit has the advantages of strong anti-interference capability, good linearity, high sensitivity, wide temperature measurement range, simple production process and low price cost.
Description
Technical Field
The utility model belongs to the technical field of the sensor, concretely relates to high sensitivity absolute temperature measuring circuit.
Background
Most physical, electronic, chemical, mechanical and biological systems exhibit some form of dependence on temperature, and therefore, temperature measurement has become a key technology in many applications. Currently, most integrated temperature sensors are mainly based on p-n Junction diodes, Bipolar Junction Transistors (BJTs), and Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs).
The temperature sensor made by utilizing the temperature characteristic of the p-n junction diffusion current has the characteristic of simple structure, the temperature measurement sensitivity is 1-3 mV/DEG C, but because the p-n junction diode also has non-ideal current including surface body internal composite current and the like, noise is introduced in the temperature measurement process, and no matter the circuit structure of a single p-n junction diode (figure 1) or two p-n junction diodes (figure 2), a constant current source can be used as a power supply, and the p-n junction diode is sensitive to light, special treatment needs to be carried out in the use process to remove the influence of ambient light, so that the use of the p-n junction diode in the temperature sensor is limited.
The temperature sensor obtained by short-circuiting the base and the collector of the BJT can eliminate noise caused by non-ideal current, and meanwhile, the temperature sensor (figure 3) based on the single BJT has higher temperature measurement sensitivity (2 mV/DEG C), but the measurement result is influenced by factors such as process diffusion and the like; while the two BJT based temperature sensor (fig. 4) eliminates the performance variation caused by process variation, it greatly reduces its temperature sensing sensitivity (-200 μ V/c). Therefore, the temperature sensor based on the BJT technology cannot simultaneously consider the performance of the anti-interference capability and the temperature measurement sensitivity, and the process thereof cannot be completely compatible with the conventional CMOS process, has low integration level, and is not suitable for large-area production.
Although the preparation process of the MOSFET-based temperature sensor (shown in figure 5) is completely compatible with CMOS (complementary metal oxide semiconductor), the area of the device is small, and large-area integration is facilitated, the temperature measurement range of the MOSFET temperature sensor working in a subthreshold region is smaller and does not exceed 100 ℃ although the temperature measurement sensitivity is higher; the MOSFET temperature sensor working in the saturation region can reach the temperature measuring range of the BJT temperature sensor though the temperature measuring range is larger, but the temperature measuring sensitivity is limited. Therefore, the temperature sensor based on the MOSFET technology cannot simultaneously achieve both the temperature measurement range and the temperature measurement sensitivity.
SUMMERY OF THE UTILITY MODEL
In order to overcome the technical defect, the utility model provides a high sensitivity absolute temperature measuring circuit, integrated temperature sensor circuit promptly, its interference killing feature is strong, the linearity is good, sensitivity is high, the temperature measurement range is wide, production simple process and low in manufacturing cost.
In order to solve the above problem, the utility model discloses realize according to following technical scheme:
a high sensitivity absolute temperature measurement circuit comprising:
the drain electrode and the grid electrode of any thin film transistor are in short circuit;
a power supply for biasing the two thin film transistors;
and two input ends of the external differential amplifier are respectively connected with the gate-source voltages of the two thin film transistors, and the gate-source voltages of the two thin film transistors are output after differential amplification processing.
Compared with the prior art, the utility model discloses a high sensitivity absolute temperature measuring circuit, its interference killing feature is strong, the linearity is good, sensitivity is high, temperature measurement range is wide, production simple process and price are with low costs. The temperature sensor circuit mainly comprises two thin film transistors with short-circuited drains and gates, and the gate-source voltages of the two thin film transistors are differentiated to obtain an output voltage signal, so that the difference of the thin film transistors caused by factors such as the process and the like is effectively eliminated; the two thin film transistors can work in the subthreshold region respectively, so that the electric output and the temperature have good linear relation, and the temperature measurement device has high temperature measurement sensitivity and a large temperature measurement range. Meanwhile, the power supply can select a constant voltage source or a constant current source according to the actual application occasion, so that the temperature sensor circuit has more flexibility and practicability.
The thin film transistor structure can adopt a single-gate structure and a double-gate structure, a power supply can select a constant voltage source or a constant current source according to practical application occasions, the thin film transistor structure and the selected power supply are different, the connection method of the temperature sensor circuit is slightly different, and the following design schemes are optional.
Optionally, the two thin film transistors are single-gate thin film transistors, the active layer materials are the same, and the active layer materials are any one of amorphous silicon, polycrystalline silicon, an organic semiconductor or an oxide semiconductor. The single-gate thin film transistor TFT has the advantages of simple preparation process and higher integration level, reduces the production cost and is suitable for large-area preparation.
Optionally, the power supply is a constant voltage source, and is connected to the drains of the two single-gate thin film transistors through the load resistors of the two branches; and the source electrodes of the two single-gate thin film transistors are connected with the negative electrode of the constant voltage source or grounded.
Optionally, the power supply is two constant current sources with different current magnitudes, and the two constant current sources are respectively and directly connected with the drain electrodes of the two single-gate thin film transistors; and the source electrodes of the two single-gate thin film transistors are respectively connected with the negative electrode of the constant current source or grounded.
Optionally, the two thin film transistors are double-gate thin film transistors, active layer materials of the two thin film transistors are the same, and the active layer material is any one of amorphous silicon, polycrystalline silicon, an organic semiconductor or an oxide semiconductor. The temperature sensor circuit formed by the double-grid thin film transistor can adjust the source-drain current of the thin film transistor by utilizing the regulation and control effect of the top grid on the bottom threshold voltage, so that the temperature sensor has higher sensitivity.
Optionally, the power supply is a constant voltage source, and is connected to the drains of the two dual-gate thin film transistors through the load resistors of the two branches; the source electrodes of the two double-grid thin film transistors are connected with the negative electrode of the constant voltage source or grounded, and the top grid electrodes are respectively connected with an external bias circuit.
Optionally, the power supply is two constant current sources with different current magnitudes, and the two constant current sources are respectively and directly connected with the drains of the two double-gate thin film transistors; the source electrodes of the two double-grid thin film transistors are respectively connected with the negative electrode of the constant current source or grounded, and the top grid electrodes are respectively connected with the external bias circuit.
Optionally, the two thin film transistors are both single-gate thin film transistors or double-gate thin film transistors, and the channel length-width ratios of the two thin film transistors may be the same or different. When the physical sizes, especially the channel sizes, of two tfts in the same circuit are not the same, the temperature measurement sensitivity is also affected. In order to improve the temperature measurement sensitivity of the temperature sensor circuit, different channel width-length ratios of the two thin film transistors can be designed according to actual use conditions.
Drawings
The following detailed description of embodiments of the invention is provided with reference to the accompanying drawings, in which:
FIG. 1 is a circuit diagram of a prior art single p-n junction diode temperature sensor;
FIG. 2 is a circuit diagram of a prior art dual p-n junction diode temperature sensor;
FIG. 3 is a circuit diagram of a conventional single BJT temperature sensor;
FIG. 4 is a circuit diagram of a conventional dual BJT temperature sensor;
FIG. 5 is a circuit diagram of a prior art MOSFET temperature sensor;
FIG. 6 is a circuit diagram of a single gate TFT integrated temperature sensor under constant voltage bias of example 1;
fig. 7 is a schematic diagram of a simulation result of a TCAD hybrid circuit of the single-gate TFT integrated temperature sensor under constant voltage source bias in embodiment 1;
FIG. 8 is a circuit diagram of a single gate TFT integrated temperature sensor under constant current source bias of embodiment 2;
FIG. 9 is a circuit diagram of the dual gate TFT integrated temperature sensor under constant voltage bias of embodiment 3;
FIG. 10 is a schematic diagram of simulation results (different R2 resistance values) of a TCAD hybrid circuit of the dual-gate TFT integrated temperature sensor under constant voltage bias of embodiment 3;
FIG. 11 is a schematic diagram of simulation results (different VTG bias voltages) of a TCAD hybrid circuit of the dual-gate TFT integrated temperature sensor under constant voltage bias of embodiment 3;
FIG. 12 is a circuit diagram of the dual gate TFT integrated temperature sensor under constant current source bias of embodiment 4;
fig. 13 is a schematic diagram of a simulation result of a TCAD hybrid circuit of the single-gate TFT integrated temperature sensor under constant voltage source bias in embodiment 5;
fig. 14 is a schematic diagram of simulation results of a TCAD hybrid circuit of the dual-gate TFT integrated temperature sensor under constant voltage bias in embodiment 5.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
Example 1
The embodiment provides a high-sensitivity absolute temperature measuring circuit, wherein a power supply adopts a constant voltage source, and a thin film transistor adopts a single-gate structure, namely, the circuit provides a single-gate TFT (thin film transistor) integrated temperature sensor circuit under the bias of the constant voltage source.
Please refer to fig. 6, which is a circuit diagram of the single-gate TFT integrated temperature sensor under the bias of the constant voltage source in the present embodiment. The circuit consists of a constant voltage source, two resistors and two single-gate thin film transistors. The active layer materials of the single-gate thin film transistor TFT1 and the single-gate thin film transistor TFT2 are the same, and may be one of amorphous silicon, polycrystalline silicon, an organic semiconductor or an oxide semiconductor, and the physical dimensions of the two single-gate thin film transistors are also the same. In the circuit, a constant voltage source is used as a power supply and is respectively connected to the drains of a TFT1 and a TFT2 through load resistors R1 and R2 of two branches, the drains of the TFT1 and the TFT2 are respectively in short circuit with respective gates, the sources are connected to the negative electrode (or the ground) of the power supply, and the gate-source voltages V of the TFT1 and the TFT2 are respectively connected to the negative electrode (or the ground)GS1And VGS2Then the signals are respectively connected to two input ends of a rear-end differential amplifier, and are output after being processed by difference, amplification and the like.
In the temperature measurement process, the single-gate thin film transistors TFT1 and TFT2 work in a subthreshold region by selecting proper voltage source and resistance value of the resistor. The final output voltage Vout of the circuit shown in fig. 6 is:
wherein, IDS1And IDS2Respectively, the current flowing through the two branches, VT1And VT2Are respectively a thin film transistor TFT1 and TFT 2. Therefore, the temperature measurement sensitivity S, which is a linear factor of the output voltage Vout and the temperature T, is:
when R1 ≠ R2, then there is IDS1≠IDS2That is, the current flowing through the two branches is not the same, at this time, the output voltage Vout of the circuit shown in fig. 6 has a linear relationship with the temperature T, and the sensitivity is shown in formula (2), and is equal to the threshold voltage V of the thin film transistor itselfT、ID0The parameters are not related; and when IDS1And IDS2The larger the phase difference, the larger the temperature sensing sensitivity, so in order to obtain a larger sensitivity, the resistors R1 and R2 should be sized so that the thin film transistors TFT1 and TFT2 operate in front of and behind the subthreshold region, respectively. In order to ensure that the TFTs 1 and 2 operate in the sub-threshold region, the resistances of the resistors R1 and R2 are matched with the channel resistance of the sub-threshold region of the TFT.
Fig. 7 is a schematic diagram of simulation results of a TCAD hybrid circuit of the single-gate TFT integrated temperature sensor under constant voltage bias in embodiment 1. From fig. 7, it can be seen that within the range of-10 to 140 ℃, the output voltage Vout of the sensor circuit has a good linear relationship with temperature, and the sensitivity of the sensor circuit is substantially greater than 1 mV/degree centigrade, even by adjusting the power supply and the resistance, the sensitivity of the sensor circuit can reach 2 mV/degree centigrade, which is much greater than that of other types of differential temperature sensors, such as a dual p-n junction diode temperature sensor, a dual BJT temperature sensor, and even about ten times that of other types of differential temperature sensors. Meanwhile, the integrated temperature sensor circuit has a temperature measuring range of 150 ℃, which is about 33% larger than that of other MOSFET temperature sensors working in a subthreshold region.
In summary, the temperature sensor circuit has the characteristics of good anti-interference performance, high sensitivity and wide temperature measurement range.
Example 2
The embodiment provides another high-sensitivity absolute temperature measuring circuit, a constant current source is adopted by a power supply, and a thin film transistor adopts a single-gate structure, namely, a single-gate TFT (thin film transistor) integrated temperature sensor circuit under the bias of the constant current source is provided.
Please refer to fig. 8, which is a circuit diagram of the single-gate TFT integrated temperature sensor under the bias of the constant current source in the present embodiment.
The circuit consists of two constant current sources and two single-gate thin film transistors. Unlike the temperature sensor circuit in embodiment 1, the temperature sensor circuit shown in fig. 8 uses two constant current sources having unequal current levels as power sources, and is directly connected to the drains of two single-gate thin film transistors TFT1 and TFT2, respectively, while the gates of the single-gate thin film transistors TFT1 and TFT2 are shorted to the respective drains, and the sources are connected to the negative electrode (or ground) of the power source, and the gate-source voltages V of the TFTs 1 and TFT2 are set to the source voltagesGS1And VGS2Then the signals are respectively connected to two input ends of a rear-end differential amplifier, and are output after being processed by difference, amplification and the like. Similarly, the active layer material of the single-gate thin film transistors TFT1 and TFT2 is the same, and may be one of amorphous silicon, polycrystalline silicon, an organic semiconductor, or an oxide semiconductor, and the physical dimensions of the two single-gate thin film transistors are the same.
In the temperature measurement process, the single-gate thin film transistors TFT1 and TFT2 work in sub-threshold regions respectively by selecting proper constant current source current, and the final output voltage and the temperature measurement sensitivity of the circuit are the same as those of the formula (1) and the formula (2). Therefore, when IDS1≠IDS2That is, when the constant current sources have unequal current values, the output voltage Vout of the circuit shown in fig. 8 has a linear relationship with the temperature T, and the sensitivity is shown in formula (7), and is equal to the threshold voltage V of the thin film transistor itselfT、ID0The parameters are not related; and when IDS1And IDS2The larger the phase difference, the larger the temperature measurement sensitivity, so in order to obtain the larger sensitivity, the current of the constant current source should be adjusted so that the thin film transistors TFT1 and TFT2 operate in front of and behind the subthreshold region, respectively.
Therefore, the integrated temperature sensor circuit has the characteristics of good anti-interference performance, high sensitivity and wide temperature measurement range; the power supply can adopt two bias modes of a constant voltage source and a constant current source, so that the circuit has more flexibility and practicability; the single-gate thin film transistor TFT is simple in preparation process and higher in integration level, production cost is reduced, and the single-gate thin film transistor TFT is suitable for large-area preparation.
Example 3
The embodiment provides a high-sensitivity absolute temperature measuring circuit, wherein a power supply adopts a constant voltage source, and a thin film transistor adopts a double-gate structure, namely, the circuit is a double-gate TFT (thin film transistor) integrated temperature sensor circuit under the bias of the constant voltage source.
Please refer to fig. 9, which is a circuit diagram of the dual-gate TFT integrated temperature sensor under constant voltage bias according to the present embodiment. The circuit consists of a constant voltage source, two resistors and two double-grid thin film transistors. The active layer materials of the double-gate thin film transistor TFT1 and the TFT2 are the same, and the double-gate thin film transistor TFT1 and the TFT2 can be one of amorphous silicon, polycrystalline silicon, an organic semiconductor or an oxide semiconductor; the physical dimensions of the two double-gate thin film transistors are also the same. In the circuit, a constant voltage source is used as a power supply and is respectively connected to the drains of the TFT1 and the TFT2 through load resistors R1 and R2 of two branches, the drains of the TFT1 and the TFT2 are respectively in short circuit with respective bottom gates, the top gates are respectively connected to an external bias circuit, the sources are connected to the negative electrode (or the ground) of the power supply, and the gate-source voltages V of the TFT1 and the TFT2 are connected to the negative electrode (or the ground)GS1And VGS2Then the signals are respectively connected to two input ends of a rear-end differential amplifier, and are output after being processed by difference, amplification and the like.
In the temperature measuring process, the double-gate thin film transistor TFT1 and TFT2 work in a subthreshold region by selecting proper voltage source and resistance value of the resistor. When R1 ≠ R2, then there is IDS1≠IDS2That is, the current flowing through the two branches is not the same, at this time, the output voltage Vout of the circuit shown in fig. 9 has a linear relationship with the temperature T, and the sensitivity is shown in formula (2), and the threshold voltage V of the thin film transistor itselfT、ID0The parameters are not related; and when IDS1And IDS2The larger the phase difference, the larger the temperature measurement sensitivity is, so in order to obtain the larger sensitivity, in addition to adjusting the resistance values of the resistors R1 and R2, the top gate bias voltage V of the double-gate thin film transistors TFT1 and TFT2 can be adjustedTG1And VTG2The thin film transistors TFT1 and TFT2 are operated in front of and behind the sub-threshold region, respectively. In order to ensure thin film crystalThe TFT1 and the TFT2 work in a sub-threshold region, and the resistance values of the resistors R1 and R2 need to be matched with the channel resistance of the sub-threshold region of the TFT.
FIGS. 10 and 11 show different R2 resistance values and different top gate bias voltages V under constant voltage bias, respectivelyTGSchematic diagram of simulation results of a TCAD hybrid circuit of a biased dual-gate thin film transistor integrated temperature sensor circuit. As can be seen from a TCAD simulation result chart, the output voltage Vout of the circuit sensor has a good linear relation with the temperature within the range of-10-150 ℃, and the sensitivity of the circuit sensor is basically greater than 1 mV/DEG C, even by adjusting the top gate bias voltage V of a resistor and a thin film transistorTGThe sensitivity of the temperature sensor can approach 3 mV/DEG C and is generally higher than the temperature measurement sensitivity of the integrated temperature sensor of the single-gate thin film transistor; meanwhile, the integrated temperature sensor has a temperature measuring range of 160 ℃, which is also higher than that of the integrated temperature sensor of the single-gate thin film transistor.
In conclusion, the integrated temperature sensor circuit has the characteristics of good anti-interference performance, high sensitivity and wide temperature measurement range.
Example 4
The embodiment provides a high-sensitivity absolute temperature measuring circuit, a power supply adopts a constant current source, a thin film transistor adopts a double-gate structure, and the double-gate TFT (thin film transistor) integrated temperature sensor circuit under the bias of the constant current source is provided.
Please refer to fig. 12, which is a circuit diagram of the dual-gate TFT integrated temperature sensor under constant current source bias according to the present embodiment. The circuit consists of two constant current sources and two double-grid thin film transistors. The active layer materials of the double-gate thin film transistor TFT1 and the TFT2 are the same, and the double-gate thin film transistor TFT1 and the TFT2 can be one of amorphous silicon, polycrystalline silicon, an organic semiconductor or an oxide semiconductor; the physical dimensions of the two double-gate thin film transistors are also the same. Unlike the temperature sensor circuit of utility model 3, the temperature sensor circuit shown in fig. 8 uses two constant current sources with unequal current levels as power sources, and directly receives the drain electrodes of two dual-gate thin film transistors TFT1 and TFT2, respectively, and the bottom gates of thin film transistors TFT1 and TFT2 are short-circuited with the respective drain electrodes, the source electrode is connected to the negative electrode (or ground) of the power source, and the top gate electrode is connected to the negative electrode (or ground) of the power source, respectivelyGate-source voltage V to external bias circuits, TFT1 and TFT2GS1And VGS2Respectively connected to two input ends of the rear-end differential amplifier, and output after differential and amplification.
In the temperature measurement process, the double-gate thin film transistors TFT1 and TFT2 work in a subthreshold region respectively by selecting proper constant current source current, and the final output voltage and the temperature measurement sensitivity of the integrated sensor circuit are the same as those of the formula (1) and the formula (2). Therefore, when IDS1≠IDS2That is, when the constant current sources have different current levels, the output voltage Vout of the circuit shown in fig. 12 has a linear relationship with the temperature T, and the sensitivity is shown in formula (2), and is equal to the threshold voltage V of the thin film transistor itselfT、ID0The parameters are not related; and when IDS1And IDS2The larger the phase difference is, the larger the temperature measurement sensitivity is, so in order to obtain larger sensitivity, the current of the constant current source can be adjusted, and the top gate bias voltage V of the double-gate thin film transistor can also be directly adjustedTG1And VTG2The double-gate thin film transistors TFT1 and TFT2 are operated in front and rear of the sub-threshold region, respectively.
Therefore, the integrated temperature sensor based on the double-gate thin film transistor not only has better anti-interference performance, but also improves the sensitivity and the temperature measuring range of the integrated temperature sensor due to the design of the double-gate thin film transistor, so that the integrated temperature sensor has the characteristics of good anti-interference performance, high sensitivity and wide temperature measuring range; the power supply can adopt two bias modes of a constant voltage source and a constant current source, so that the circuit has more flexibility and practicability; the double-gate thin film transistor TFT is simple in preparation process and higher in integration level, production cost is reduced, and the double-gate thin film transistor TFT is suitable for large-area preparation.
Example 5
The integrated temperature sensor circuit designs of embodiments 1-4 are all based on the premise that the physical sizes of two thin film transistors in the same circuit are consistent. When the physical sizes, especially the channel sizes, of two tfts in the same circuit are not the same, the temperature measurement sensitivity is also affected. The difference between this embodiment and embodiments 1 to 4 is that the channel length-width ratios of the two thin film transistors are different, and the other circuit structures are the same, that is, any one of the circuit structures of embodiments 1 to 4 may be used, and details are not repeated here.
For integrated temperature sensor circuits with different channel length-to-width ratios for thin film transistors TFT1 and TFT2, the final output voltage Vout is:
wherein ID01 and ID02 are related to the channel width to length ratio of the thin film transistor device:
therefore, the temperature measurement sensitivity S, which is a linear factor of the output voltage Vout and the temperature T, is:
when W is1/L1＝W2/L2When the formula (5) is the same as the formula (2); when W is1/L1≠W2/L2Then, the temperature measurement sensitivity S is related to the ratio of the channel width to length ratios of the TFT1 and TFT2, i.e., when W is1/L1<W2/L2In time, the temperature measurement sensitivity S is increased; when W is1/L1>W2/L2In time, the temperature measurement sensitivity decreases.
FIGS. 13 and 14 show different channel width/length ratios, i.e., different W, of the TFT22/L2The schematic diagram of the TCAD simulation result of the single-gate and double-gate integrated temperature sensor proves the theoretical speculation. Therefore, in order to improve the temperature measurement sensitivity of the temperature sensor, the channel width to length ratios of the two thin film transistors TFT1 and TFT2 may be designed to be different according to actual use conditions.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made by the technical spirit of the present invention to the above embodiments do not depart from the technical solution of the present invention, and still fall within the scope of the technical solution of the present invention.
Claims (7)
1. A high-sensitivity absolute temperature measurement circuit, comprising:
the drain electrode and the grid electrode of any thin film transistor are in short circuit;
a power supply for biasing the two thin film transistors;
and two input ends of the external differential amplifier are respectively connected with the grid-source voltages of the two thin film transistors, and differential amplification processing is carried out on the grid-source voltages of the two thin film transistors.
2. The high-sensitivity absolute temperature measurement circuit according to claim 1, wherein the two thin film transistors are both single-gate thin film transistors, and the active layer material is any one of amorphous silicon, polycrystalline silicon, an organic semiconductor, or an oxide semiconductor.
3. The high-sensitivity absolute temperature measuring circuit according to claim 2, wherein the power supply is a constant voltage source, and is connected to the drains of the two single-gate thin film transistors through the load resistors of the two branches; and the source electrodes of the two single-gate thin film transistors are connected with the negative electrode of the constant voltage source or grounded.
4. The high-sensitivity absolute temperature measuring circuit according to claim 2, wherein the power supply is two constant current sources having different current magnitudes, which are directly connected to drains of the two single-gate thin film transistors, respectively; and the source electrodes of the two single-gate thin film transistors are respectively connected with the negative electrode of the constant current source or grounded.
5. The high-sensitivity absolute temperature measurement circuit according to claim 1, wherein the two thin film transistors are both double-gate thin film transistors, and the active layer material is any one of amorphous silicon, polysilicon, an organic semiconductor, or an oxide semiconductor.
6. The high-sensitivity absolute temperature measuring circuit according to claim 5, wherein the power source is a constant voltage source, and is connected to the drains of the two dual-gate thin film transistors through the load resistors of the two branches; the source electrodes of the two double-grid thin film transistors are connected with the negative electrode of the constant voltage source or grounded, and the top grid electrodes are respectively connected with an external bias circuit.
7. The high-sensitivity absolute temperature measuring circuit according to claim 5, wherein the power source is two constant current sources with different current magnitudes, which are directly connected to the drains of the two dual-gate thin film transistors, respectively; the source electrodes of the two double-grid thin film transistors are respectively connected with the negative electrode of the constant current source or grounded, and the top grid electrodes are respectively connected with the external bias circuit.
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