CN114353974A - Integrated circuit temperature sensing circuit - Google Patents
Integrated circuit temperature sensing circuit Download PDFInfo
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- CN114353974A CN114353974A CN202111408568.3A CN202111408568A CN114353974A CN 114353974 A CN114353974 A CN 114353974A CN 202111408568 A CN202111408568 A CN 202111408568A CN 114353974 A CN114353974 A CN 114353974A
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Abstract
The invention discloses an integrated circuit temperature sensing circuit, comprising: the sensing unit is used for charging and discharging an energy storage capacitor under the action of a control signal so as to convert the temperature of the integrated circuit into a voltage signal; the input end of the comparison unit is connected with a voltage signal, and the comparison unit compares the voltage signal with a first reference voltage and a second reference voltage respectively and carries out logic processing to generate a comparison signal; the feedback unit processes the comparison signal to generate a control signal; the output end of the output unit is connected with the processing module and outputs a counting signal; the processing module generates a temperature signal according to the counting signal. The invention has the beneficial effects that: the temperature in the integrated circuit is directly obtained by adopting the sensing unit arranged in the integrated circuit, so that better measurement precision is realized, the conditions of temperature detection delay and temperature value deviation caused by chip packaging are avoided, and the temperature in the current integrated circuit can be accurately obtained in real time.
Description
Technical Field
The invention relates to the technical field of temperature sensors, in particular to an integrated circuit temperature sensing circuit.
Background
With the continuous progress of society, various precision instruments are continuously produced, so that the requirement on detection precision is also improved, especially for the monitoring of the temperature of the whole circuit system, the integrated temperature sensor is more and more applied to a temperature detection system and an integrated chip needing temperature protection, and the working temperature of the chip is required to be effectively detected in time in high-power semiconductor devices, such as a CPU, an ultra-high-speed AD converter, an ultra-high-speed DA converter, a power amplifier and the like.
In the prior art, a temperature sensor is usually placed on the back of a chip to measure the temperature of the integrated circuit, so that the internal temperature of the chip cannot be accurately measured by the above method, and particularly, the internal temperature of the chip is unbalanced and has local hot spots for the measured temperature cannot accurately reflect the circuit temperature and timely and effective protection cannot be realized.
Disclosure of Invention
In view of the above-mentioned problems in the prior art, an integrated circuit temperature sensing circuit is now provided.
The specific technical scheme is as follows:
an integrated circuit temperature sensing circuit, comprising:
the sensing unit is used for charging and discharging an energy storage capacitor under the action of a control signal so as to convert the temperature of the integrated circuit into a voltage signal;
the input end of the comparison unit is connected with the voltage signal, and the comparison unit compares the voltage signal with a first reference voltage and a second reference voltage respectively and carries out logic processing to generate a comparison signal;
the input end of the feedback unit is connected with the comparison signal, and the comparison signal is processed to generate the control signal;
the input end of the output unit is connected with the output end of the comparison unit, and the output end of the output unit is connected with a processing module and outputs a counting signal to the processing module;
the processing module generates a temperature signal according to the counting signal.
Preferably, the sensing unit includes:
a first current source controllably connected between a supply voltage and a switch node through a first switch;
a second current source controllably connected between the switch node and a ground terminal through a second switch;
a sensing current source connected between the switch node and the ground terminal;
the first end of the energy storage capacitor is connected with the switch node, and the second end of the energy storage capacitor is connected with the grounding end;
the output current of the sensing current source increases with an increase in temperature of the integrated circuit.
Preferably, the comparing unit includes:
a positive input end of the first comparator is connected with the voltage signal, and a negative input end of the first comparator is connected with the first reference voltage;
the first comparator generates a first comparison signal according to the voltage signal and the first reference signal;
a positive input end of the second comparator is connected with the voltage signal, and a negative input end of the second comparator is connected with the second reference voltage;
the second comparator generates a second comparison signal according to the voltage signal and the second reference signal;
the clock synchronization module receives a first comparison signal output by the first comparator and a second comparison signal output by the second comparator, and the signal synchronization module performs clock synchronization on the first comparison signal and the second comparison signal and outputs the first comparison signal and the second comparison signal to an RS trigger;
a first input end of the RS trigger receives the first comparison signal after clock synchronization through a first inverter;
a second input end of the RS trigger receives the second comparison signal after clock synchronization;
the RS trigger outputs the comparison signal according to the first comparison signal and the second comparison signal;
preferably, the clock synchronization module includes:
the input end of the first buffer is connected with the output end of the first comparator;
a first input end of the first delay flip-flop is connected with an output end of the first buffer, a second input end of the first delay flip-flop is connected with a clock signal, and an output end of the first delay flip-flop is connected with a first input end of the RS flip-flop;
the input end of the second buffer is connected with the output end of the second comparator;
and a second input end of the second delay trigger is connected with the output end of the second buffer, a second input end of the second delay trigger is connected with the clock signal, and an output end of the second delay trigger is connected with a second input end of the RS trigger.
Preferably, the feedback unit includes:
the first control signal output end is connected with the output end of the comparison unit and used for outputting a first control signal to the first switch;
the input end of the second inverter is connected with the output end of the comparison unit;
and the second control signal output end is connected with the output end of the comparison unit and is used for outputting a second control signal to the second switch.
Preferably, the output unit includes:
and the input end of the first inverter is connected with the output end of the comparison unit, and the output end of the last inverter is connected with the processing module.
Preferably, the first reference voltage is greater than the second reference voltage.
Preferably, the processing module comprises:
a register that receives and stores the count signal;
and the sampling circuit reads the counting signal from the register and counts according to the rising edge or the falling edge of the temperature signal to generate the temperature signal.
The technical scheme has the following advantages or beneficial effects: the temperature in the integrated circuit is directly obtained by adopting the sensing unit arranged in the integrated circuit, so that better measurement precision is realized, the conditions of temperature detection delay and temperature value deviation caused by chip packaging are avoided, and the temperature in the current integrated circuit can be accurately obtained in real time.
Drawings
Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. The drawings are, however, to be regarded as illustrative and explanatory only and are not restrictive of the scope of the invention.
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a functional block diagram of the present invention;
FIG. 3 is a schematic diagram of a sensing current source according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of reference voltages according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of comparative signals according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The invention comprises the following steps:
an integrated circuit temperature sensing circuit, as shown in fig. 1 and 2, comprising:
the sensing unit 1 is used for controllably charging and discharging an energy storage capacitor under the action of a control signal so as to convert the temperature of the integrated circuit into a voltage signal;
the input end of the comparison unit 2 is connected with a voltage signal, and the comparison unit 2 compares the voltage signal with a first reference voltage and a second reference voltage respectively and carries out logic processing to generate a comparison signal;
the input end of the feedback unit 3 is connected with the comparison signal, and the comparison signal is processed to generate a control signal;
the input end of the output unit 4 is connected with the output end of the comparison unit 2, the output end of the output unit 4 is connected with a processing module 5, and a counting signal is output to the processing module 5;
the processing module 5 generates a temperature signal from the count signal.
Specifically, the present solution provides an integrated circuit temperature sensor circuit for solving the problems existing in the prior art. In practical implementation, the circuit is arranged inside a chip as a part of an integrated circuit, so as to directly monitor the temperature change condition of the integrated circuit inside the chip. In a preferred embodiment, the counting signal refers to a level signal which is output by the circuit and adjusts the duty ratio according to the temperature, and a sampling circuit 52 is present in the processing module 5 for counting the rising edge or the falling edge of the counting signal to realize direct reading of the current temperature indication.
In a preferred embodiment, the sensing unit 1 comprises:
a first current source IbnA first current source IbnControllably connected between the supply voltage VCC and a switching node a through a first switch K1;
a second current source I3A second current source I3Controllably connected between switch node a and ground GND via a second switch K2;
sensing current source IptatSense current source IptatIs connected between the switch node A and the ground end GND;
a first end of the energy storage capacitor C1 is connected with the switch node A, and a second end of the energy storage capacitor C1 is connected with a ground end GND;
sensing current source IptatIncreases with increasing temperature of the integrated circuit.
Specifically, as shown in fig. 3, as the temperature T gradually increases, the sensing current source IptatThe output current I also increases linearly, and the first current source IbnAnd a second current source I3The output current of (a) is then a fixed value.
Further, the first switch K1 and the second switch K2 are controlled switches, which are turned on and off according to the control signal output by the feedback unit 3 to control the charging and discharging processes of the energy storage capacitor C1. When K1 is closed, K2 is opened, and the charging current I of the energy storage capacitor C1 is the first current source IbnIs subtracted by the current sensing current source I at the current temperatureptatThe output current of (1). When K1 is opened and K2 is closed, the input current of the energy storage capacitor C1 is only the current source I sensed at the current temperatureptatThus the energy storage capacitor C1 is in a discharged state.
In a preferred embodiment, the comparison unit 2 comprises:
a positive input end of the first comparator COM1 is connected with a voltage signal, and a negative input end of the first comparator COM1 is connected with a first reference voltage Vref 1;
the first comparator COM2 generates a first comparison signal according to the voltage signal and a first reference voltage Vref 1;
a positive input end of the second comparator COM2 is connected with a voltage signal, and a negative input end of the second comparator COM2 is connected with a second reference voltage Vref 2;
the second comparator COM2 generates a second comparison signal according to the voltage signal and a second reference voltage Vref 2;
the clock synchronization module CS1, the clock synchronization module CS1 receives the first comparison signal output from the first comparator COM1 and the second comparison signal output from the second comparator COM2, and the clock synchronization module performs clock synchronization on the first comparison signal and the second comparison signal and outputs the signals to an RS flip-flop;
a first input end of the RS flip-flop RS1 receives a first comparison signal after clock synchronization through a first inverter INV 1;
a second input end of the RS trigger RS1 receives a second comparison signal after clock synchronization;
the RS flip-flop RS1 outputs a comparison signal according to the first comparison signal and the second comparison signal.
Specifically, based on the above, the charging and discharging processes of the energy storage capacitor C1 are adjusted by the first switch K1 and the second switch K2, and the voltage of the energy storage capacitor C1 inevitably changes with time as shown in fig. 4 along with the charging and discharging processes of the energy storage capacitor C1. At this time, the first reference voltage Vref1 and the second reference voltage Vref2 are respectively set, the current voltage state of the energy storage capacitor C1 can be verified through the comparator, so that a corresponding signal is output through the comparator and then processed by the RS flip-flop RS 1.
Further, the truth table of the RS flip-flop RS1 is shown in table 1:
TABLE 1
It can be derived based on the above truth table of the RS1 flip-flop whose output signal is shown in fig. 4. The first comparison signal and the second comparison signal detected by the first comparator COM1 and the second comparator COM2 can be further processed by setting the RS flip-flop to generate a comparison signal C which is finally required to be output as shown in fig. 5. The comparison signal C is simultaneously used in the subsequent circuit as a processing circuit for reading out the sensed count signal and controlling the opening of the switch K1 and the switch K2.
As an alternative embodiment, the processing module 51 is provided with a sampling circuit 52, and the sampling frequency of the sampling circuit 52 is much higher than the frequency of the temperature signal. The processing module judges the current temperature value according to the sampling period of the digital sampling circuit.
In a preferred embodiment, the clock synchronization module CS1 includes:
the input end of the first Buffer1 is connected with the output end of the first comparator COM 1;
a first delay flip-flop DFF1, a first input terminal of the first delay flip-flop DFF1 is connected to an output terminal of the first Buffer1, a second input terminal of the first delay flip-flop DFF1 is connected to the clock signal clk, and an output terminal of the first delay flip-flop DFF1 is connected to a first output terminal of the comparing unit 2;
the input end of the second Buffer2 is connected with the output end of the second comparator COM 2;
a second input terminal of the second delay flip-flop DFF2, the second delay flip-flop DFF2 is connected to the output terminal of the second Buffer2, a second input terminal of the second delay flip-flop DFF2 is connected to the clock signal clk, and an output terminal of the second delay flip-flop DFF2 is connected to the second output terminal of the comparing unit 2.
Specifically, the output signals of the first comparator COM1 and the second comparator COM2 can be respectively clock-synchronized by providing the first Buffer1, the first delay flip-flop DFF1, the second Buffer2 and the second delay flip-flop DFF2 so that the RS flip-flop RS1 can output the required comparison signal C.
In a preferred embodiment, the feedback unit 3 comprises:
a first control signal output end, which is connected to the output end of the comparison unit 2 and is used for outputting a first control signal to the first switch K1;
an input end of the second inverter INV2, wherein the input end of the second inverter INV2 is connected to the output end of the comparing unit 2;
and a second control signal output end, which is connected to the output end of the comparing unit 2 and is used for outputting a second control signal to the second switch K2.
Specifically, the first control signal output terminal, the second inverter inv2 and the second control signal output terminal are sequentially arranged in the feedback unit, so that the signal C output by the RS flip-flop RS1 can be inverted to control the first switch K1 and the second switch K2 to be in opposite on-off states all the time.
In a preferred embodiment, the output unit 4 comprises:
in the embodiment shown in fig. 1, an input end of the first inverter INV3 is connected to an output end of the comparing unit 2, and an output end of the last inverter INV4 is connected to the processing module 5.
Specifically, by providing at least one pair of inverters inv3 and inv4 connected in series, the on-load driving capability of the signal C can be increased to generate a count signal of actual output, so as to achieve better adaptability to the processing module 5.
In a preferred embodiment, the first reference voltage Vref1 is greater than the second reference voltage Vref 2.
In a preferred embodiment, the processing module 5 comprises:
a register 51, the register 51 receiving and storing the count signal;
the sampling circuit 52 reads the count signal from the register 51, and the sampling circuit 52 counts the count signal according to the rising edge or the falling edge of the count signal to generate a temperature signal.
The invention has the beneficial effects that: the temperature in the integrated circuit is directly obtained by adopting the sensing unit arranged in the integrated circuit, so that better measurement precision is realized, the conditions of temperature detection delay and temperature value deviation caused by chip packaging are avoided, and the temperature in the current integrated circuit can be accurately obtained in real time.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. An integrated circuit temperature sensing circuit, comprising:
the sensing unit is used for charging and discharging an energy storage capacitor under the action of a control signal so as to convert the temperature of the integrated circuit into a voltage signal;
the input end of the comparison unit is connected with the voltage signal, and the comparison unit compares the voltage signal with a first reference voltage and a second reference voltage respectively and carries out logic processing to generate a comparison signal;
the input end of the feedback unit is connected with the comparison signal, and the comparison signal is processed to generate the control signal;
the input end of the output unit is connected with the output end of the comparison unit, and the output end of the output unit is connected with a processing module and outputs a counting signal to the processing module;
the processing module generates a temperature signal according to the counting signal.
2. The integrated circuit temperature sensing circuit of claim 1, wherein the sensing unit comprises:
a first current source controllably connected between a supply voltage and a switch node through a first switch;
a second current source controllably connected between the switch node and a ground terminal through a second switch;
a sensing current source connected between the switch node and the ground terminal;
the first end of the energy storage capacitor is connected with the switch node, and the second end of the energy storage capacitor is connected with the grounding end;
the output current of the sensing current source increases with an increase in temperature of the integrated circuit.
3. The integrated circuit temperature sensing circuit of claim 1, wherein the comparison unit comprises:
a positive input end of the first comparator is connected with the voltage signal, and a negative input end of the first comparator is connected with the first reference voltage;
the first comparator generates a first comparison signal according to the voltage signal and the first reference signal;
a positive input end of the second comparator is connected with the voltage signal, and a negative input end of the second comparator is connected with the second reference voltage;
the second comparator generates a second comparison signal according to the voltage signal and the second reference signal;
the clock synchronization module receives a first comparison signal output by the first comparator and a second comparison signal output by the second comparator, and outputs the first comparison signal and the second comparison signal to an RS trigger after performing clock synchronization on the first comparison signal and the second comparison signal;
a first input end of the RS trigger receives the first comparison signal after clock synchronization through a first inverter;
a second input end of the RS trigger receives the second comparison signal after clock synchronization;
the RS trigger outputs the comparison signal according to the first comparison signal and the second comparison signal.
4. The integrated circuit temperature sensing circuit of claim 3, wherein the clock synchronization module comprises:
the input end of the first buffer is connected with the output end of the first comparator;
a first input end of the first delay flip-flop is connected with an output end of the first buffer, a second input end of the first delay flip-flop is connected with a clock signal, and an output end of the first delay flip-flop is connected with a first input end of the RS flip-flop;
the input end of the second buffer is connected with the output end of the second comparator;
and a second input end of the second delay trigger is connected with the output end of the second buffer, a second input end of the second delay trigger is connected with the clock signal, and an output end of the second delay trigger is connected with a second input end of the RS trigger.
5. The integrated circuit temperature sensing circuit of claim 2, wherein the feedback unit comprises:
the first control signal output end is connected with the output end of the comparison unit and used for outputting a first control signal to the first switch;
the input end of the second inverter is connected with the output end of the comparison unit;
and the second control signal output end is connected with the output end of the comparison unit and is used for outputting a second control signal to the second switch.
6. The integrated circuit temperature sensing circuit of claim 1, wherein the output unit comprises:
and the input end of the first inverter is connected with the output end of the comparison unit, and the output end of the last inverter is connected with the processing module.
7. The integrated circuit temperature sensing circuit of claim 3, wherein the first reference voltage is greater than the second reference voltage.
8. The integrated circuit temperature sensing circuit of claim 1, wherein the processing module comprises:
a register that receives and stores the count signal;
and the sampling circuit reads the counting signal from the register and counts according to the rising edge or the falling edge of the temperature signal to generate the temperature signal.
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| CN202111408568.3A CN114353974A (en) | 2021-11-24 | 2021-11-24 | Integrated circuit temperature sensing circuit |
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| CN202111408568.3A CN114353974A (en) | 2021-11-24 | 2021-11-24 | Integrated circuit temperature sensing circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114636484A (en) * | 2022-05-09 | 2022-06-17 | 深圳市航顺芯片技术研发有限公司 | Digital temperature sensor, chip temperature detection system and chip temperature detection method |
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2021
- 2021-11-24 CN CN202111408568.3A patent/CN114353974A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114636484A (en) * | 2022-05-09 | 2022-06-17 | 深圳市航顺芯片技术研发有限公司 | Digital temperature sensor, chip temperature detection system and chip temperature detection method |
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