CN102865943A - time domain temperature sensor - Google Patents
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- CN102865943A CN102865943A CN2011101950525A CN201110195052A CN102865943A CN 102865943 A CN102865943 A CN 102865943A CN 2011101950525 A CN2011101950525 A CN 2011101950525A CN 201110195052 A CN201110195052 A CN 201110195052A CN 102865943 A CN102865943 A CN 102865943A
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Abstract
The invention is a time domain temperature sensor, comprising: the device comprises a reference current generator, a charging time comparator and an arithmetic unit. The reference current generator is used for generating a first reference current and a second reference current, wherein one of the first reference current and the second reference current is not changed along with the ambient temperature, and the other reference current is changed along with the ambient temperature. The charging time comparator comprises a first capacitor and a second capacitor which respectively and correspondingly receive a first reference current and a second reference current. The first capacitor is charged according to the first reference current, and the voltage difference between two ends of the first capacitor is equal to the set cross voltage. The charging time comparator records the time when the second capacitor is charged according to the second reference current until the voltage difference between the two ends of the second capacitor is equal to the set cross voltage so as to generate a comparison result. The arithmetic unit receives the comparison result and generates a temperature sensing result according to the comparison result.
Description
Technical field
The present invention is relevant for a kind of time domain temperature sensor.
Background technology
Below please refer to shown in Figure 1, the circuit diagram of temperature sensor 100 in the past.Temperature sensor 100 comprise lag line 110, mutual exclusion or door 120, with door 130 and counter 140, the time delay that lag line 110 wherein provides can change along with the variation of environment temperature.Temperature sensor 100 can provide the start signal START of pulse signal to input to lag line 110 when operating, and lag line 110 postpones simultaneously start signal START and postpones rear signal DST to produce.Mutual exclusion or door 120 then the start signal START that is not delayed of reception and postpone after signal DST, and compare start signal START and postpone after the phase differential PHD of signal DST.With 130 poor PHD of receiving phase of door and reference frequency REFCK, and the number of pulses of the reference frequency REFCK that the positive pulse width of phase differential PHD equals that utilizes reference frequency REFCK to take a sample out.140 in counter calculates aforesaid number of pulses and knows thus the size of environment temperature TEMP.
Can be learnt by above-mentioned explanation about temperature sensor 100, the resolution of the environment temperature TEMP that temperature sensor 100 is detected depends on the size of 110 time delays that can produce of lag line.In technical field in the past, postpone in order to make lag line 110 can produce time enough, often need very large circuit layout area, serious raising the cost of circuit.Relative, under the restriction of the cost of circuit, the resolution of the environment temperature TEMP that temperature sensor 100 in the past detects is not enough.
Summary of the invention
The invention provides a kind of time domain temperature sensor, the resolution of Effective Raise ambient temperature sensing.
The present invention proposes a kind of time domain temperature sensor, comprises reference current generator, duration of charging comparer and arithmetical unit.Reference current generator is in order to produce the first reference current and the second reference current, and wherein one of them of the first reference current and the second reference current be with variation of ambient temperature, and another reference current wherein can be with variation of ambient temperature.The duration of charging comparer couples reference current generator, comprises the first electric capacity and the second electric capacity, and the first electric capacity and the second electric capacity is corresponding the first reference current and the second reference current of receiving respectively.The duration of charging comparer makes the first electric capacity charge according to the first reference current, and makes that the both end voltage of the first electric capacity is poor to equal to set cross-pressure.The duration of charging comparer makes the second electric capacity charge according to the second reference current again, and records the second capacitor charging and equal to set the time of cross-pressure to produce comparative result to its both end voltage is poor.Arithmetical unit couples the duration of charging comparer, receives comparative result and produces the temperature sensing result according to comparative result.
In one embodiment of this invention, above-mentioned duration of charging comparer also comprises charging current generator, voltage comparison module, the first switch, second switch and the 3rd switch.The charging current generator couples reference current generator and the first electric capacity and the second electric capacity.Charging current generator foundation the first reference current and the second reference current are to produce respectively the first charging current and the second charging current.Two input ends of voltage comparison module are coupled to respectively the charging current generator and are coupled to coupling a little of the first electric capacity and the second electric capacity.Voltage comparison module comparison charging current generator be coupled to the first electric capacity and the second electric capacity couple a little on voltage, and produce thus comparative result.The first switch series is connected between the first electric capacity and ground voltage, is controlled by the first control signal.Second switch is serially connected in coupling between the path of the second electric capacity and charging current generator, is controlled by the second control signal.The 3rd switch series is connected between voltage comparison module and the second electric capacity.Wherein, not simultaneously conducting of the first switch and second switch.
In one embodiment of this invention, above-mentioned comparison module comprises comparer, latch unit and frequency eliminator.Two input ends of comparer receive respectively the charging current generator be coupled to the first electric capacity and the second electric capacity couple a little on voltage.Latch unit is coupled to the output terminal of comparer, when the output terminal of comparer indication charging current generator be coupled to the first electric capacity and the second electric capacity couple a little on voltage when equating, latch unit generation pulse signal.Frequency eliminator couples latch unit, and return pulse signal also carries out frequency elimination for pulse signal, to produce comparative result.
In one embodiment of this invention, above-mentioned latch unit comprises the first Sheffer stroke gate, the second Sheffer stroke gate and not gate.The input end of the first Sheffer stroke gate is coupled to the output terminal of comparer.The input end of not gate is coupled to the input end that the first Sheffer stroke gate is coupled to the output terminal of comparer.The second Sheffer stroke gate, one input end are coupled to the output terminal of this first Sheffer stroke gate, and its another input end is coupled to the output terminal of this not gate, and its output terminal couples mutually with the input end that the first Sheffer stroke gate is not coupled to not gate.
In one embodiment of this invention, the output terminal of the first above-mentioned Sheffer stroke gate produces pulse signal.
In one embodiment of this invention, above-mentioned frequency eliminator is a T-shaped flip-flop, and T-shaped flip-flop has frequency end and output terminal, and its frequency end is coupled to the output terminal of latch unit, and its output terminal produces comparative result.
In one embodiment of this invention, above-mentioned duration of charging comparer also comprises the electric charge Resetting Switching.The electric charge Resetting Switching is coupled between the end points and ground voltage that the first electric capacity couples the charging current generator, is controlled by reset control signal.
In one embodiment of this invention, when the output terminal of above-mentioned comparer indication charging current generator be coupled to the first electric capacity and the second electric capacity couple a little on voltage when equal, latch unit also produces reset control signal and makes the conducting of electric charge Resetting Switching.
In one embodiment of this invention, above-mentioned arithmetical unit comprises logical circuit and counter.The output terminal of logic circuits coupled duration of charging comparer receives and carries out logical operation according to comparative result and frequency signal.Counter couples the output terminal of logical circuit, in order to the pulse wave quantity of the output of logical circuit of counter circuit.
In one embodiment of this invention, above-mentioned logical circuit is and door inclusive NAND door.
In other words, the present invention is a kind of time domain temperature sensor, wherein, comprising:
One reference current generator, in order to produce one first reference current and one second reference current, one of them of wherein said the first reference current and described the second reference current be not with variation of ambient temperature, and another reference current wherein can be with variation of ambient temperature;
One duration of charging comparer, couple described reference current generator, comprise one first electric capacity and one second electric capacity, described the first electric capacity and described the second electric capacity is corresponding described the first reference current and described the second reference current of receiving respectively, described duration of charging comparer makes described the first electric capacity charge according to described the first reference current, and the poor setting cross-pressure that equals of the both end voltage that makes described the first electric capacity, described duration of charging comparer makes described the second electric capacity charge according to described the second reference current again, and records described the second capacitor charging and equal the time of described setting cross-pressure to produce a comparative result to its both end voltage is poor; And
One arithmetical unit couples described duration of charging comparer, receives described comparative result and produces a temperature sensing result according to described comparative result.
Time domain temperature sensor of the present invention, wherein, described duration of charging comparer also comprises:
One charging current generator couples described reference current generator and described the first electric capacity and described the second electric capacity, and described the first reference current of foundation and described the second reference current are to produce respectively one first charging current and one second charging current;
One voltage comparison module, two input end is coupled to respectively described charging current generator and is coupled to coupling a little of described the first electric capacity and described the second electric capacity, more described charging current generator be coupled to described the first electric capacity and described the second electric capacity couple a little on voltage, and produce thus described comparative result;
One first switch is serially connected between described the first electric capacity and a ground voltage, is controlled by one first control signal;
One second switch is serially connected in coupling between the path of described the second electric capacity and described charging current generator, is controlled by one second control signal; And
One the 3rd switch is serially connected between described voltage comparison module and described the second electric capacity, wherein, and the not simultaneously conducting of described the first switch and described second switch.
Time domain temperature sensor of the present invention, wherein, described comparison module comprises:
One comparer, two input end receive respectively described charging current generator be coupled to described the first electric capacity and described the second electric capacity couple a little on voltage;
One latch unit is coupled to the output terminal of described comparer, when the output terminal of described comparer indicate described charging current generator be coupled to described the first electric capacity and described the second electric capacity couple a little on voltage when equating, described latch unit produces a pulse signal; And
One frequency eliminator couples described latch unit, receives described pulse signal and carries out frequency elimination for described pulse signal, to produce described comparative result.
Time domain temperature sensor of the present invention, wherein, described latch unit comprises:
One first Sheffer stroke gate, one input end is coupled to the output terminal of described comparer;
One not gate, its input end are coupled to the input end that described the first Sheffer stroke gate is coupled to the output terminal of described comparer; And
One second Sheffer stroke gate, one input end is coupled to the output terminal of described the first Sheffer stroke gate, and its another input end is coupled to the output terminal of described not gate, and its output terminal couples mutually with the input end that described the first Sheffer stroke gate is not coupled to described not gate.
Time domain temperature sensor of the present invention, wherein, the output terminal of described the first Sheffer stroke gate produces described pulse signal.
Time domain temperature sensor of the present invention, wherein, described frequency eliminator is a T-shaped flip-flop, and described T-shaped flip-flop has frequency end and output terminal, and its frequency end is coupled to the output terminal of described latch unit, and its output terminal produces described comparative result.
Time domain temperature sensor of the present invention, wherein, described duration of charging comparer also comprises:
One electric charge Resetting Switching is coupled between the end points and described ground voltage that described the first electric capacity couples described charging current generator, is controlled by a reset control signal.
Time domain temperature sensor of the present invention, wherein, when the output terminal of described comparer indicate described charging current generator be coupled to described the first electric capacity and described the second electric capacity couple a little on voltage when equating, described latch unit also produces described reset control signal and makes the conducting of described electric charge Resetting Switching.
Time domain temperature sensor of the present invention, wherein, described arithmetical unit comprises:
One logical circuit couples the output terminal of described duration of charging comparer, receives and carries out logical operation according to described comparative result and a frequency signal; And
One counter couples the output terminal of described logical circuit, in order to the number of pulses of the output of counting described logical circuit.
Time domain temperature sensor of the present invention, wherein, described logical circuit is and door.In sum, utilization meeting of the present invention is with variation of ambient temperature and respectively two different electric capacity do not charge with two of variation of ambient temperature different reference currents.Utilize the both end voltage of one of them electric capacity poor as setting cross-pressure, required duration of charging when the cross-pressure that calculates again another electric capacity equals to set cross-pressure, and utilize the length of calculating the above-mentioned duration of charging, obtain the temperature sensing result.The setting of the capacitance by charging is provided and the capacitance size of reference current can effectively promote temperature sensing result's resolution.
For enabling further to understand feature of the present invention and technology contents, please refer to following relevant detailed description of the present invention and accompanying drawing, yet appended graphic only be for provide with reference to the usefulness of explanation, the present invention is limited.
Description of drawings
Fig. 1 is the circuit diagram of temperature sensor 100 in the past.
Fig. 2 is the schematic diagram of the time domain temperature sensor 200 of one embodiment of the invention.
Fig. 3 is the schematic diagram of the time domain temperature sensor 300 of another embodiment of the present invention.
Fig. 4 is the embodiment schematic diagram of the voltage comparison module 322 of the embodiment of the invention.
Fig. 5 is the movement oscillogram of the frequency eliminator 3222 of the embodiment of the invention.
Fig. 6 is an embodiment schematic diagram of the arithmetical unit 330 of the embodiment of the invention.
The explanation of Reference numeral
100: temperature sensor
110: lag line
120: mutual exclusion or door
130: with door
140,332: counter
200,300: the time domain temperature sensor
210,310: reference current generator
220,320: the duration of charging comparer
230,330: arithmetical unit
270,370: timer
321: the charging current generator
322: voltage comparison module
CMP1: comparer
3221: latch unit
3222: frequency eliminator
331: logical circuit
CKREF: frequency signal
INV1: not gate
NAND1～NAND2: Sheffer stroke gate
SW4: electric charge Resetting Switching
IC, IP: charging current
C1～C2: electric capacity
W1～SW3: switch
GND: ground voltage
V1, V2: voltage
PULSE: pulse signal
START: start signal
DST: signal after postponing
PHD: phase differential
REFCK: reference frequency
TEMP: environment temperature
CC, PTAT: reference current
CMPR: comparative result
CTRL: control signal
Embodiment
Please refer to Fig. 2, Fig. 2 is the schematic diagram of the time domain temperature sensor 200 of one embodiment of the invention.Time domain temperature sensor 200 comprises reference current generator 210, duration of charging comparer 220 and arithmetical unit 230.Reference current generator 210 is in order to produce two groups of not identical reference current CC and PTAT, and wherein, reference current CC is with variation of ambient temperature, and reference current PTAT then is can be with variation of ambient temperature.Wherein, reference current generator 210 can utilize so-called band gap (band gap) circuit to come construction, produces respectively reference current PTAT and CC with what utilize that it is provided with the irrelevant voltage of environment temperature and general voltage.
Duration of charging comparer 220 couples reference current generator 210.Duration of charging comparer 220 built-in two electric capacity (not shown)s, wherein corresponding reference current CC and the PTAT of receiving of these two electric capacity difference.Duration of charging comparer 220 makes one of them electric capacity charge according to reference current CC (or PTAT), and makes that the both end voltage of the electric capacity that charges according to reference current CC (or PTAT) is poor to equal to set cross-pressure.Then, duration of charging comparer 220 makes another electric capacity charge according to reference current PTAT (or CC) again, and this capacitor charging that record charges according to reference current PTAT (or CC) produces comparative result CMPR to the poor time that equals to set cross-pressure of its both end voltage.
Subsidiary one what carry is that duration of charging comparer 220 also comprises reception control signal CTRL.Duration of charging comparer 220 reception control signal CTRL come as startup or close the foundation that electric capacity wherein charges.And control signal CTRL is the signal that does not produce drift with environment temperature.And the irrelevant control signal CTRL of this and environment temperature equally can be by the reference current generator 210 of band gap circuit institute construction that provide with the irrelevant voltage CV of environment temperature, and produce by timer 2 70.
Below please refer to Fig. 3, Fig. 3 is the schematic diagram of the time domain temperature sensor 300 of another embodiment of the present invention.Time domain temperature sensor 300 comprises reference current generator 310, duration of charging comparer 320, arithmetical unit 330 and timer 370.Reference current generator 310 produces the reference current CC that has nothing to do with environment temperature and the relevant reference current PTAT with environment temperature.320 of duration of charging comparers comprise charging current generator 321, voltage comparison module 322, capacitor C 1～C2, switch SW 1～SW3 and electric charge Resetting Switching SW4.Charging current generator 321 is coupled to reference current generator 310, receiving reference current CC and PTAT, and produces respectively charging current IC and IP according to reference current CC and PTAT.Wherein, charging current IC is provided and flows to capacitor C 2 charging current IP and then be provided and flow to capacitor C 1.
Two input ends of voltage comparison module 322 are coupled to charging current generator 321 and are coupled to coupling a little of capacitor C 1 and C2, and pass through to compare the difference of the voltage on capacitor C 1 and the C2, thereby produce comparative result CMPR.
In the overall operation process of time domain temperature sensor 300, at first, switch SW 2 is switched on (simultaneously, switch SW 1, SW3 and electric charge Resetting Switching SW4 disconnect), and makes capacitor C 1 can receive reference current IP to charge.When the cross-pressure when two end points of capacitor C 1 equaled predefined setting cross-pressure, switch SW 2 was disconnected, and stopped the charging action of capacitor C 1.Then, switch SW 3 is switched on, and makes voltage on the capacitor C 1 be transferred into an input end of voltage comparison module 322.Then, actuating switch SW1 makes capacitor C 2 charge according to reference current IC.At the same time, the magnitude of voltage on voltage comparison module 322 detecting real-time capacitor C 2 and the capacitor C 1 is in case the voltage on the capacitor C 2 rises to when identical with voltage on the capacitor C 1 voltage comparison module 322 corresponding its comparative result CMPR that produce of change.
In addition, when the voltage of voltage comparison module 322 comparison on the capacitor C 2 is identical with voltage on the capacitor C 1, can corresponding generation reset control signal make electric charge Resetting Switching SW4 conducting.When electric charge Resetting Switching SW4 conducting, the electric charge in the capacitor C 2 will be released, and make the cross-pressure on the capacitor C 2 get back to the no-voltage level.
After the cross-pressure on the capacitor C 2 is got back to the no-voltage level, electric charge Resetting Switching SW4 correspondence is disconnected, and capacitor C 2 general reception reference current IC again are to charge, 322 of voltage comparison module are carried out the voltage that compares on capacitor C 1 and the C2 again, and change the comparative result CMPR that it produces.
Below please refer to Fig. 4, Fig. 4 is the embodiment schematic diagram of the voltage comparison module 322 of the embodiment of the invention.Voltage comparison module 322 comprises comparator C MP1, latch unit 3221 and frequency eliminator 3222.Voltage V1 on the comparator C MP1 reception capacitor C 1 as shown in Figure 3 and the voltage V2 on the capacitor C 2.The output terminal of comparator C MP1 is coupled to latch unit 3221.3221 of latch units are the SR latch units that is made of Sheffer stroke gate NAND1～NAND2 and not gate INV1.Wherein, the input end of Sheffer stroke gate NAND1 is coupled to the output terminal of comparator C MP1 and the input end of not gate INV1, another input end of Sheffer stroke gate NAND1 is coupled to the output terminal of Sheffer stroke gate NAND2, the input end of Sheffer stroke gate NAND2 is coupled to the output terminal of not gate INV1, and another input end of Sheffer stroke gate NAND2 then is coupled to the output terminal of Sheffer stroke gate NAND1.When comparator C MP1 relatively arrives voltage V1 when identical with voltage V2, the output terminal of comparator C MP1 can produce a pulse signal, and 3221 of latch units can breech lock and the pulse width that prolongs this pulse signal.In addition, when the output terminal of Sheffer stroke gate NAND1 carried out breech lock and prolongs the pulse width of pulse signal, the output terminal of Sheffer stroke gate NAND2 then can produce reset control signal with conducting electric charge Resetting Switching SW4 as shown in Figure 3.
3222 output terminals that are coupled to latch unit 3221 of frequency eliminator.The action that the pulse signal that frequency eliminator 3222 produces for latch unit 3221 carries out frequency elimination to be to produce comparative result CMPR, wherein, the state switching points of comparative result CMPR just correspond to each pulse signal by the low-voltage transition to high-tension state switching points.
In the present embodiment, frequency eliminator 3222 is made of T-shaped flip-flop, and wherein, frequency eliminator 3222 has frequency end CK and output terminal D, and its frequency end CK is coupled to the output terminal of latch unit 3221, and its output terminal D produces comparative result CMPR.
Below please refer to Fig. 5, wherein Fig. 5 is the movement oscillogram of the frequency eliminator 3222 of the embodiment of the invention.Wherein, in Fig. 5, frequency eliminator 3222 carries out the action of frequency elimination for pulse signal PULSE, and produces comparative result CMPR.Can know discovery by Fig. 5, the width of the positive or negative pulse of comparative result CMPR equals the duration of charging that capacitor C 2 charges to cross-pressure just.
Then please refer to Fig. 6, Fig. 6 is an embodiment schematic diagram of the arithmetical unit 330 of the embodiment of the invention.In Fig. 6, arithmetical unit 330 comprises logical circuit 331 and counter 332.Logical circuit 331 couples the output terminal of duration of charging comparer to receive comparative result CMPR.Logical circuit 331 is gone back receiving frequency signals CKREF.Logical circuit 331 carries out logical operation according to comparative result CMPR and frequency signal CKREF.In simple terms, take logical circuit 331 be with door as example, when comparative result CMPR equaled the logic high levle, the pulse of frequency signal CKREF can be directly be output by the output terminal of logical circuit 331.Relative, when comparative result CMPR equals the logic low level, the pulse crested of frequency signal CKREF, and the output terminal output logic low level signal of logical circuit 331.332 output terminals that couple logical circuit 331 of counter are in order to the pulse wave quantity of logical circuit of counter circuit 331 outputs.At this, the pulse wave quantity of logical circuit 331 outputs is corresponding with the pulse bandwidth of comparative result CMPR, and the pulse bandwidth of CMPR is wider, and the pulse wave quantity of logical circuit 331 outputs is higher.
Can be learnt by above-mentioned explanation, just can be conversed the pulse bandwidth of comparative result CMPR by the count results of counter 332.For example, when the cycle of frequency signal CKREF is 1 microsecond, and when the count results of counter 332 was 100, the pulse bandwidth of comparative result CMPR just equaled 1 microsecond * 100, also just equaled 100 microseconds.
Certainly, logical circuit 331 is not must be by implementing with door yet, wherein, as long as can produce the pulse wave of direct transmit frequency signal CKREF for one of them that is just reaching negative pulsewidth at comparative result CMPR, and can use to implement logical circuit 331 at comparative result CMPR for another logical circuit that covers the pulse wave of frequency signal CKREF that is just reaching negative pulsewidth.Relevant above-mentioned logical circuit is the known technology of personnel of the common knowledge of this area tool, below seldom gives unnecessary details for this reason.
In sum, the reference current that do not change with environment temperature of utilization of the present invention and can carry out with the reference current that environment temperature changes charging to different electric capacity.And the duration of charging that charges to default default cross-pressure by wherein, know the variation of environment temperature.Thus, the temperature sensing result's who produces resolution can be according to needs, are changed the size of current value of capacitance, reference current or the size of default cross-pressure by the deviser, effectively set.And these settings do not need the very large circuit layout area that accounts for, and have effectively saved circuit cost.
Although embodiment disclosed by the invention as mentioned above, these embodiment are the usefulness for illustrating only, and should not be interpreted as restriction of the invention process.Within not breaking away from essential scope of the present invention, other change or variation all belong to protection scope of the present invention.
Claims (10)
1. a time domain temperature sensor is characterized in that, comprising:
One reference current generator, in order to produce one first reference current and one second reference current, one of them of wherein said the first reference current and described the second reference current be not with variation of ambient temperature, and another reference current wherein can be with variation of ambient temperature;
One duration of charging comparer, couple described reference current generator, comprise one first electric capacity and one second electric capacity, described the first electric capacity and described the second electric capacity is corresponding described the first reference current and described the second reference current of receiving respectively, described duration of charging comparer makes described the first electric capacity charge according to described the first reference current, and the poor setting cross-pressure that equals of the both end voltage that makes described the first electric capacity, described duration of charging comparer makes described the second electric capacity charge according to described the second reference current again, and records described the second capacitor charging and equal the time of described setting cross-pressure to produce a comparative result to its both end voltage is poor; And
One arithmetical unit couples described duration of charging comparer, receives described comparative result and produces a temperature sensing result according to described comparative result.
2. time domain temperature sensor according to claim 1 is characterized in that, described duration of charging comparer also comprises:
One charging current generator couples described reference current generator and described the first electric capacity and described the second electric capacity, and described the first reference current of foundation and described the second reference current are to produce respectively one first charging current and one second charging current;
One voltage comparison module, two input end is coupled to respectively described charging current generator and is coupled to coupling a little of described the first electric capacity and described the second electric capacity, more described charging current generator be coupled to described the first electric capacity and described the second electric capacity couple a little on voltage, and produce thus described comparative result;
One first switch is serially connected between described the first electric capacity and a ground voltage, is controlled by one first control signal;
One second switch is serially connected in coupling between the path of described the second electric capacity and described charging current generator, is controlled by one second control signal; And
One the 3rd switch is serially connected between described voltage comparison module and described the second electric capacity, wherein, and the not simultaneously conducting of described the first switch and described second switch.
3. time domain temperature sensor according to claim 2 is characterized in that, described comparison module comprises:
One comparer, two input end receive respectively described charging current generator be coupled to described the first electric capacity and described the second electric capacity couple a little on voltage;
One latch unit is coupled to the output terminal of described comparer, when the output terminal of described comparer indicate described charging current generator be coupled to described the first electric capacity and described the second electric capacity couple a little on voltage when equating, described latch unit produces a pulse signal; And
One frequency eliminator couples described latch unit, receives described pulse signal and carries out frequency elimination for described pulse signal, to produce described comparative result.
4. time domain temperature sensor according to claim 3 is characterized in that, described latch unit comprises:
One first Sheffer stroke gate, one input end is coupled to the output terminal of described comparer;
One not gate, its input end are coupled to the input end that described the first Sheffer stroke gate is coupled to the output terminal of described comparer; And
One second Sheffer stroke gate, one input end is coupled to the output terminal of described the first Sheffer stroke gate, and its another input end is coupled to the output terminal of described not gate, and its output terminal couples mutually with the input end that described the first Sheffer stroke gate is not coupled to described not gate.
5. time domain temperature sensor according to claim 4 is characterized in that, the output terminal of described the first Sheffer stroke gate produces described pulse signal.
6. time domain temperature sensor according to claim 3, it is characterized in that, described frequency eliminator is a T-shaped flip-flop, and described T-shaped flip-flop has frequency end and output terminal, its frequency end is coupled to the output terminal of described latch unit, and its output terminal produces described comparative result.
7. time domain temperature sensor according to claim 2 is characterized in that, described duration of charging comparer also comprises:
One electric charge Resetting Switching is coupled between the end points and described ground voltage that described the first electric capacity couples described charging current generator, is controlled by a reset control signal.
8. time domain temperature sensor according to claim 7, it is characterized in that, when the output terminal of described comparer indicate described charging current generator be coupled to described the first electric capacity and described the second electric capacity couple a little on voltage when equating, described latch unit also produces described reset control signal and makes the conducting of described electric charge Resetting Switching.
9. time domain temperature sensor according to claim 1 is characterized in that, described arithmetical unit comprises:
One logical circuit couples the output terminal of described duration of charging comparer, receives and carries out logical operation according to described comparative result and a frequency signal; And
One counter couples the output terminal of described logical circuit, in order to the pulse wave quantity of the output of counting described logical circuit.
10. time domain temperature sensor according to claim 9 is characterized in that, described logical circuit is and door.
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| TW100123520A TWI425197B (en) | 2011-07-04 | 2011-07-04 | Time-domain temperature sensor |
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| CN110553748A (en) * | 2019-09-09 | 2019-12-10 | 浙江悦和科技有限公司 | Chip wiring layer temperature sensing circuit, temperature detection method and corresponding chip |
| CN111051831A (en) * | 2017-11-02 | 2020-04-21 | 微芯片技术股份有限公司 | Current-based temperature measurement apparatus and method |
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| TWI585378B (en) * | 2014-03-27 | 2017-06-01 | 矽創電子股份有限公司 | Temperature sensing circuit and its conversion circuit |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201303276A (en) | 2013-01-16 |
| CN102865943B (en) | 2014-04-02 |
| TWI425197B (en) | 2014-02-01 |
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