CN103499991A - Analog-to-digital conversion circuit with temperature sensing function and electronic device of analog-to-digital conversion circuit - Google Patents
Analog-to-digital conversion circuit with temperature sensing function and electronic device of analog-to-digital conversion circuit Download PDFInfo
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- CN103499991A CN103499991A CN201310204508.9A CN201310204508A CN103499991A CN 103499991 A CN103499991 A CN 103499991A CN 201310204508 A CN201310204508 A CN 201310204508A CN 103499991 A CN103499991 A CN 103499991A
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Abstract
The invention relates to an analog-to-digital conversion circuit with a temperature sensing function and an electronic device of the analog-to-digital conversion circuit. A first impedance element receives a first reference voltage and generates a current according to a temperature; an analog-to-digital conversion unit is coupled to the first impedance element and generates a digital output signal according to the current. In this way, the first impedance element is integrated to the analog-to-digital conversion circuit, so that the area of the circuit is reduced, power consumption is lowered, cost is lowered accordingly, and the accuracy of temperature sensing is improved.
Description
Technical field
The invention relates to a kind of analog-to-digital conversion circuit and electronic installation thereof, espespecially a kind of analog-to-digital conversion circuit of tool temperature sensing and electronic installation thereof.
Background technology
Press, most electronic product or element are all very responsive to the variation of operating temperature now, and for example digital camera can affect its output performance because of its residing temperature environment; And, with regard to chip IC inside, the variation of temperature also can affect operating point and arithmetic speed.So for to ask stable performance, most electronic component usually must arrange in pairs or groups a temperature detecting device to detect extraneous temperature, and carry out the compensation of signal.
The circuit that is widely used in temperature detecting now is two-carrier junction transistor (Bipolar Junction Transistor, BJT) circuit, its principle is two magnitudes of voltage of comparison (all being produced by the two-carrier junction transistor), a magnitude of voltage has relevant to temperature, another magnitude of voltage is uncorrelated with temperature, by comparing two magnitudes of voltage, can obtain the result of temperature variation, by the difference feed-in analog-digital converter of these two voltages, can obtain the numerical code of representation temperature information.
Yet, the temperature sensor of realizing with two-carrier junction transistor form, its susceptibility is lower, need the auxiliary circuit that precision is higher and increase the complexity of circuit, and then increase cost, and because use the two-carrier junction transistor, operate in lower voltage so more difficult, so increase power consumption.
Therefore, how a kind of analog-to-digital conversion circuit and electronic installation thereof of novel tool temperature sensing are proposed for the problems referred to above, it is avoided using the auxiliary circuit that precision is higher and reduces costs, and cpable of lowering power consumption and lifting resolution, makes to address the above problem.
Summary of the invention
The object of the present invention is to provide a kind of analog-to-digital conversion circuit and electronic installation thereof of tool temperature sensing, it is integrated into analog-to-digital conversion circuit by one first impedor, to reduce circuit area and to reduce power consumption, and then reduce costs, and increase the degree of accuracy of sensing temperature.
The analog-to-digital conversion circuit of tool temperature sensing of the present invention comprises one first impedor and an analog digital converting unit.The first impedor receives one first reference voltage, and produces an electric current according to a temperature; Analog digital converting unit couples the first impedor, and produces a digital output signal according to electric current.So, the present invention is integrated into analog-to-digital conversion circuit by the first impedor, to reduce circuit area and to reduce power consumption, and then reduces costs, and increases the degree of accuracy of sensing temperature.
Electronic installation of the present invention comprises one first impedor, an analog digital converting unit and a treatment circuit.The first impedor receives one first reference voltage, and produces an electric current according to a temperature; Analog digital converting unit couples this first impedor, and produces a digital output signal according to electric current; Treatment circuit couples this analog digital converting unit, and produces a processing signal according to this numeral output signal.So, the present invention is integrated into analog-to-digital conversion circuit by the first impedor, to reduce circuit area and to reduce power consumption, and then reduces costs, and increases the degree of accuracy of sensing temperature.
The beneficial effect of implementing the present invention's generation is: the analog-to-digital conversion circuit of tool temperature sensing of the present invention and electronic installation thereof receive a reference voltage by one first impedor, and produce an input current according to a temperature; One analog digital converting unit couples the first impedor, and produce a digital output signal according to input current, so, the present invention is integrated into analog-to-digital conversion circuit by one first impedor, to reduce circuit area and to reduce power consumption, and then reduce costs.
The accompanying drawing explanation
The circuit diagram of the analog-to-digital conversion circuit of the tool temperature sensing that Fig. 1 is one first embodiment of the present invention;
The circuit diagram of the analog-to-digital conversion circuit of the tool temperature sensing that Fig. 2 is one second embodiment of the present invention;
The circuit diagram of the analog-to-digital conversion circuit of the tool temperature sensing that Fig. 3 is of the present invention 1 the 3rd embodiment;
The circuit diagram of the first correcting circuit that Fig. 4 is one embodiment of the invention;
The circuit diagram of the analog-to-digital conversion circuit of the tool temperature sensing that Fig. 5 is of the present invention 1 the 4th embodiment;
The circuit diagram of the first compensating circuit that Fig. 6 is one embodiment of the invention;
The circuit diagram of the second compensating circuit that Fig. 7 is one embodiment of the invention;
The circuit diagram of the analog-to-digital conversion circuit of the tool temperature sensing that Fig. 8 is of the present invention 1 the 5th embodiment;
The analog-to-digital conversion circuit of the tool temperature sensing that Fig. 9 is of the present invention 1 the 6th embodiment is applied to the circuit diagram of electronic installation; And
The circuit diagram of the analog-to-digital conversion circuit of the tool temperature sensing that Figure 10 is of the present invention 1 the 6th embodiment.
[figure number is to as directed]
| 1 | The analog-to-digital conversion circuit of tool temperature sensing |
| 10、202、30、212、216 | Impedor |
| 200、214、700 | The |
| 204、218、704 | |
| 206、706 | |
| 208、708 | |
| 210、710 | |
| 20、70 | Analog |
| 40 | |
| 400 | |
| 402 | Change-over |
| 42、44 | |
| 424，444 | |
| 426，446 | |
| 4200～4207，4400～4407 | |
| 4220～4228，4420～4428 | Code switch |
| 5 | |
| 50 | Treatment circuit |
| 60、702、80 | Current source |
Embodiment
In the middle of instructions and follow-up claim, used some vocabulary to censure specific element.The person with usual knowledge in their respective areas should understand, and hardware manufacturer may be called same element with different nouns.This instructions and follow-up claim are not used as distinguishing the mode of element with the difference of title, but the difference on function is used as the criterion of distinguishing with element.In the whole text, in the middle of instructions and follow-up claims, be an open term mentioned " comprising ", therefore should be construed to " comprise but be not limited to ".In addition, " couple " word and comprise any means that indirectly are electrically connected that directly reach at this.Therefore, if describe a first device in literary composition, be coupled to one second device, represent that this first device can directly be electrically connected in this second device, or indirectly be electrically connected to this second device through other device or connection means.
For the effect that makes architectural feature of the present invention and reach has a better understanding and awareness, the spy is by preferred embodiment and coordinate detailed explanation, is described as follows:
Referring to Fig. 1, is the circuit diagram of the analog-to-digital conversion circuit of the tool temperature sensing of one first embodiment of the present invention.As shown in the figure, the analog-to-digital conversion circuit 1 of tool temperature sensing of the present invention comprises an impedor 10 and an analog digital converting unit 20.Impedor 10 has a first end and one second end, and the first end of impedor 10 receives a reference voltage Vref 1, and the second end of impedor 10 couples analog-to-digital conversion circuit 20, and impedor 10 produces an electric current I according to temperature
1(t), analog digital converting unit 20 couples impedor 10, and according to electric current I
1(t) produce a digital output signal, to learn temperature information.
From the above, analog digital converting unit 20 comprises an operation amplifier unit 200, an impedor 202, an electric capacity 204, a sample circuit 206, a processing unit 208 and a clock generating circuit 210.Operation amplifier unit 200 has an inverting input, an output terminal and a normal phase input end, and the inverting input of operation amplifier unit 200 and normal phase input end couple respectively impedor 10 and a common mode voltage Vcm.Impedor 202 has a first end and one second end, the first end of impedor 202 couples the inverting input of operation amplifier unit 200, the second termination of impedor 202 is received reference voltage Vref 2 or Vref3, wherein reference voltage Vref 3 can be no-voltage, and reference voltage Vref 1 can equate for essence with Vref2.Electric capacity 204 has a first end and one second end, and the first end of electric capacity 204 and the second end couple respectively inverting input and the output terminal of operation amplifier unit 200.
Based on above-mentioned, because impedor (change such as resistance, transistor etc.) has temperature coefficient usually, that is to say, when temperature change, impedor can followed and changed, so, the first end of impedor 10 is changed into to reference voltage Vref 1 by originally receiving input voltage, make impedor 10 can produce because temperature variation is corresponding different electric current I
1(t), make analog digital converting unit 20 according to electric current I
1(t) to learn temperature information.Wherein, reference voltage Vref 1 can be fixing voltage, and the operation amplifier unit 200 of impedor 10 and analog digital converting unit 20, impedor 202 can be equivalent to a prime sensing circuit with electric capacity 204, and its sensing principle illustrates as follows.
General impedor resistance value R
x(t) with the relational expression of temperature, be R
x(t)=R
x(ty) * (1+tc
x* (t-ty)), wherein x is resistance kenel (resistor type), t and ty are temperature, tc
xthe temperature coefficient of resistance kenel while being x, R
x(ty) resistance value when the temperature t y for the resistance kenel resistance that is x.Below adopting the reference temperature that temperature t y is 0 degree is example.When the voltage of reference voltage Vref l and Vref2 is all Vref, and the second termination of impedor 202 is while receiving reference voltage Vref 2, the electric current I that the impedor 10 that resistance kenel x is 1 produces
1(t) be:
I
1(t)＝(V
ref-V
cm)/(R
1(0)×(1+tc
1×t))……………………………(1)
In like manner, the electric current I that the impedor 202 that resistance kenel x is 2 produces
2(t) be:
I
2(t)＝(V
ref-V
cm)/(R
2(0)×(1+tc
2×t))……………………………(2)
From the above, assumed resistance element 10 and 202 has positive temperature coefficient (PTC), that is temperature coefficient tc
1with tc
2be greater than zero, along with the rising of temperature, other resistance value R of impedor 10 and 202
1and R (t)
2(t) all can become large, the electric current I of inflow
1and I (t)
2(t) will reduce, so, because electric current I
1and I (t)
2(t) electric current that flows into the input end of operation amplifier unit 200 reduces, and the digital output signal that analog digital converting unit 20 is parsed is naturally smaller.Anti-, when temperature descends, resistance value R
1and R (t)
2(t) all can diminish, the electric current I of inflow
1and I (t)
2(t) will increase, the digital output signal that analog digital converting unit 20 is parsed becomes large, and so, the present invention changes resistance value by impedor 10 because temperature variation is corresponding, to learn current state of temperature.
In addition, analog digital converting unit 20 of the present invention be one continuous time trigonometric integral modulator (Continuous-Time Delta-Sigma Modulator, CTDSM), and being integrated in analog digital converting unit 20 by impedor 10, the present invention can carry out the sensing temperature state, so, the present invention is integrated into analog-to-digital conversion circuit 1 by impedor 10, to reduce circuit area and to reduce power consumption, and then reduces costs.
Seeing also Fig. 2, is the circuit diagram of the analog-to-digital conversion circuit of the tool temperature sensing of one second embodiment of the present invention.As shown in the figure, what the present embodiment was different from the first embodiment locates, and is that this analog-to-digital conversion circuit 1 of implementing sharp tool temperature sensing more comprises an impedor 30.Impedor 30 has a first end and one second end, and the first end of impedor 30 couples the inverting input of operation amplifier unit 200, and the second termination of impedor 30 is received reference voltage Vref 4, and wherein reference voltage Vref 4 can be no-voltage.
Due in the first embodiment, general temperature coefficient tc
1with tc
2usually little more a lot of than 1, so, when temperature change, resistance value R
1and R (t)
2(t) the change amount is not very large.Therefore, the present embodiment is in order to make temperature sensing front end (being impedor 10 and 202) more responsive to the change of temperature, and increased impedor 30, wherein, and the temperature coefficient tc of impedor 30
3size or characteristic and temperature coefficient tc
1difference, for example, as temperature coefficient tc
1during for positive temperature coefficient (PTC), and temperature coefficient tc
3for negative temperature coefficient, or temperature coefficient tc
1during for negative temperature coefficient, and temperature coefficient tc
3for positive temperature coefficient (PTC).In the present embodiment, temperature coefficient tc
1for positive temperature coefficient (PTC), temperature coefficient tc
3for negative temperature coefficient, so along with temperature rises, resistance value R
1(t) with rising, and the resistance value R of impedor 30
3(t) with decline.
Connect describedly, please refer to Fig. 2, the second termination that is all Vref, impedor 202 when the voltage of the temperature t y reference temperature that is 0 degree, reference voltage Vref 1 and Vref2 is received reference voltage Vref 2, and Vref4 can find resistance value R while being no-voltage
3(t) can flow out electric current I
3(t), it is:
I
3(t)＝(V
cm-0)/(R
3(0)×(1+tc
3×t))………………………………(3)
If when temperature rises, resistance value R
1and R (t)
2(t) can increase, and make electric current I
1and I (t)
2(t) diminish, as for resistance value R
3(t) reduce and make output current I
3(t) can become large, thus one toward and make the electric current difference become large, therefore, when the present embodiment just makes temperature variation by impedor 30, make the input current amplitude of variation of analog input converting unit 20 become large, to increase the susceptibility of temperature.
In addition, the present embodiment promotes susceptibility except the idea of utilizing reversal, and the present embodiment also can utilize the resistance value size of revising impedor 10,202 and 30, and reaches the electric current I of analog digital converting unit 20
1(t), I
2and I (t)
3(t) function zoomed in or out.As shown in Figure 2, those impedor convergent-divergent equivalences can be regarded as resistance value R
1(t), R
2and R (t)
3(t) be multiplied by a multiple α, that is the resistance value of impedor 10,202 and 30 is respectively α R
1(t), α R
2(t) with α R
3(t).So, the convergent-divergent equivalence that the present embodiment can multiple α is to electric current I
1(t), I
2and I (t)
3(t) zoom in or out, and do not need extra hardware circuit, and then reach saving circuit area and cost.
In addition, if when analog digital converting unit of the present invention 20 is arranged in a chip IC, impedor 10 of the present invention and 30 also can be arranged at chip IC interior (on chip) or can be arranged at chip IC outer (off chip).Further, with reference to Fig. 1 and Fig. 2, in other embodiments, impedor 10 and 202 can be resistance, electric capacity, or inductance wherein selects one or combination institute forms.For example impedor 10 and 202 is respectively that an electric capacity and an inductance form, or impedor 10 consists of electric capacity institute in parallel with a resistance, and impedor 202 by an electric capacity, with an inductance, connected form.
Seeing also Fig. 3, is the circuit diagram of the analog-to-digital conversion circuit of the tool temperature sensing of of the present invention 1 the 3rd embodiment.As shown in the figure, the analog-to-digital conversion circuit 1 of the tool temperature sensing of the present embodiment more comprises a correcting circuit 40.Correcting circuit 40 couples impedor 10, to proofread and correct the resistance value of impedor 10, i.e. and correcting circuit 40 series impedance element 10, and the resistance value of proofreading and correct impedor 10.Due in chip IC manufacturing process, impedor of different nature (for example impedor 10 is just different from 30 character) is because the processing procedure skew, the resistance value of making is not easy to control, namely resistance value can have gap with ideal, therefore, need correcting circuit 40 to be finely tuned, as shown in Figure 3, when if the resistance value of impedor 10 has error because of the processing procedure factor, the resistance value that can use correcting circuit 40 to proofread and correct impedor 10, make its resistance value equal resistance value ideally.
Seeing also Fig. 4, is the circuit diagram of the correcting circuit of one embodiment of the invention.As shown in the figure, the first correcting circuit 40 of the present invention comprises at least one correcting element 400 and at least one change-over switch 402.At least one correcting element 400 couples impedor 10, and to proofread and correct the resistance value of impedor 10, at least one change-over switch 402 is parallel to correcting element 400, with conduction and cut-off correcting element 400.In the present embodiment, correcting circuit 40 uses a plurality of correcting elements 400 and a plurality of change-over switches 402, those change-over switches are parallel to respectively those correcting elements 400, determine the required resistance value of those correcting elements 400 correction impedors 10 with conduction and cut-off correcting element 400.
Further, with reference to Fig. 3 and Fig. 4, in other embodiments, impedor 30 and correcting element 400, can be resistance, electric capacity, or inductance wherein selects one or combination institute forms.For example impedor 30 is respectively that an electric capacity and an inductance form with correcting element 400, or impedor 30 by an electric capacity in parallel with a resistance form, and correcting element 400 by an electric capacity, with an inductance, connected form.
Seeing also Fig. 5, is the circuit diagram of the analog-to-digital conversion circuit of the tool temperature sensing of of the present invention 1 the 4th embodiment.As shown in the figure, although can see through correcting circuit 40 returns the effect adjustment of the processing procedure skew institute resistance value deviation that causes change, but be in course of adjustment, those change-over switches 402 can be contributed extra resistance value again, and the extra resistance that those change-over switches 402 are contributed also has relation with temperature.So, affecting degree of accuracy for fear of those change-over switch 402 extra resistance values of contribution, the analog-to-digital conversion circuit 1 of tool temperature sensing of the present invention more comprises compensating circuit 42 and 44.Compensating circuit 42 couples impedor 202, and corresponding correcting circuit 40 and the resistance value of compensating impedance element 202, and compensating circuit 44 couples impedor 30, and corresponding correcting circuit 40 is with compensating circuit 42 and the resistance value of compensating impedance element 30.That is to say, affect the degree of accuracy of temperature sensor because extra resistance value can be provided those change-over switches 402 in correcting circuit 40, so, the compensating circuit 42 of this enforcement and 44 resistance values in order to difference compensating impedance element 202 and impedor 30, with those change-over switch 402 extra resistance values that produced in compensation correction circuit 40, and then the degree of accuracy of increase temperature sensor.
Seeing also Fig. 6, is the circuit diagram of the compensating circuit of one embodiment of the invention.As shown in the figure, the compensating circuit 42 of the present embodiment comprises plural decoding switch 4200～4207, plural code switch 4220～4228, a decoding unit 424 and a coding unit 426.Decoding switch 4200～4207 is coupled to impedor 202, and according to correcting circuit 40 conduction and cut-off, the afterbody decoding switch 4207 of those decoding switches 4200～4207 is coupled to an output terminal OUT of compensating circuit 42, those code switchs 4220～4228 have respectively a first end and one second end, the first end of those code switchs 4220～4228 all is coupled to an input end IN of compensating circuit 42, and the second end of those code switchs 4220～4228 is respectively coupled to those switch decoders 4200～4207, make those decoding switches 4200～4207 lay respectively at those code switchs 4220～4228 the second end between, decoding unit 424 receives controls signal ctr1, and produce a decoding signal according to controlling signal ctr1, and transmit the decoding signal to those decoding switches 4200～4207, to control those switch decoder 4200～4207 conductings or cut-offs, coding unit 426 couples those code switchs 4220～4228, coding unit 426 receives controls signal ctr1, and produce a coding signal according to controlling signal ctr1, and transfer control signal ctr1 is to those code switchs 4220～4228, to control those code switch 4220～4228 conductings or cut-offs.
Based on above-mentioned, decoding unit 424 is learnt and is needed the several decoding switches 422 of conducting according to controlling signal ctr1 with coding unit 426, with the resistance value of those change-over switches 402 in corresponding compensation correction circuit 40.For example controlling signal is 01000001 o'clock, 2 change-over switch 402 conductings are arranged in correcting circuit 40, so, it is 00000011 that 424 of the decoding units of compensating circuit 42 produce the decoding signal, two decoding switches 4200 with conducting output terminal OUT front, 4201, simultaneously, the coding signal that coding unit 426 produces is 00000100, and transmit the control end of this coding signal to those code switchs 422, and conducting code switch 4222, make electric current can be through input end IN, code switch 4222 with decoding switch 4201,4200 to output terminal OUT.So compensating circuit 42 is the resistance value with two change-over switches 402 of conducting in the compensation correction circuit by conducting decoding switch 4201,4200.
In addition, because those code switchs 4220～4228 have several decoding switch conductings regardless of in those decoding switches 4200～4207, necessarily have a code switch conducting in those code switchs 4220～4228, the decoding signal that for example decoding unit 424 produces is 00000000 o'clock (being the state that those decoding switches 4200～4207 are all cut-off), the coding signal that coding unit 426 produces is 000000001, with 4220 conductings of control coding switch, make the electric current can be via input end IN and code switch 4220 to output terminal OUT, when the decoding signal produced when decoding unit 424 is 11111111 (those switch decoders 4200～4207 are all the state of conducting), the coding signal that coding unit 426 produces is 100000000, with control coding switch 4228, make electric current can be via code switch 4228 with those decoding switches 4207～4200 to output terminal OUT, so, no matter in those switch decoders 4200～4207, how many switch conductions are arranged, those code switchs 4220～4228, so, the switch of 42 conductings of compensating circuit is compared to the switch of 40 conductings of correcting circuit many one of always, and the generation error, therefore, the switch that the present invention can arrange a permanent conduction in correcting circuit 40 can solve the above problems.
In like manner, seeing also Fig. 7, is the circuit diagram of another compensating circuit of one embodiment of the invention.As shown in the figure, the compensating circuit 44 of the present embodiment comprises a decoding unit 444, a coding unit 446, plural decoding switch 4400～4407 and plural code switch 4420～4428.The decoding unit 444 that the compensating circuit 44 of the present embodiment comprises, coding unit 446, those decoding switches 4400～4407 are all identical with the compensating circuit 42 of Fig. 6 with the circuit component of those code switchs 4420～4428, and the principle of work of the compensating circuit 44 of the present embodiment is same as the compensating circuit 42 of Fig. 6, so, in this, no longer repeated.
Seeing also Fig. 8, is the circuit diagram of the analog-to-digital conversion circuit of the tool temperature sensing of of the present invention 1 the 5th embodiment.As shown in the figure, the analog-to-digital conversion circuit 1 of the tool temperature sensing of the present embodiment more comprises an impedor 212, an operation amplifier unit 214, an impedor 216 and an electric capacity 218.Impedor 212 couples the output terminal of the first operation amplifier unit 200, operation amplifier unit 214 has an inverting input, an output terminal and a normal phase input end, and the inverting input of operation amplifier unit 214 and normal phase input end couple respectively impedor 212 and a common mode voltage Vcm.Impedor 216 has a first end and one second end, the first end of impedor 216 couples inverting input and the impedor 212 of operation amplifier unit 214, the second termination of impedor 216 is received reference voltage Vref 5 or Vref6, wherein reference voltage Vref 5 can adopt voltage Vref identical with Vref2 essence with reference voltage Vref 1, and Vref6 can be no-voltage.Described with aforementioned Fig. 1, clock generating circuit 210 produces frenquency signal, with control group element 216, receives reference voltage Vref 5 or Vref6.Electric capacity 218 has a first end and one second end, and the first end of electric capacity 218 couples inverting input, the impedor 212 and impedor 216 of operation amplifier unit 214, and the second end of electric capacity 218 couples the output terminal of operation amplifier unit 214.Based on above-mentioned, trigonometric integral modulator continuous time that the analog digital converting unit 20 of the present embodiment is a second order, it can increase the usefulness of analog digital conversion.
Refer to Fig. 9, for the analog-to-digital conversion circuit of the tool temperature sensing of one embodiment of the invention is applied to the circuit diagram of electronic installation.As shown in the figure, the present embodiment is in above-described embodiment difference, the analog-to-digital conversion circuit that is the tool temperature sensing of the present embodiment can be applied to any needs and learn that on the electronic installation of temperature information number, the electronic installation 5 of the present embodiment comprises impedor 10, analog digital converting unit 20 and a treatment circuit 50.Impedor 10 receives reference voltage Vref 1, and according to temperature generation current I
1(t), analog digital converting unit 20 couples impedor 10, and according to input current I
1(t) produce digital output signal, treatment circuit 50 connects analog digital converting unit 20, and produces a processing signal and export and process signal for subsequent conditioning circuit according to digital output signal.Wherein treatment circuit 50 is a gas sensor, a light source sensor, a pressure transducer or a gravity sensor.
Further, with reference to Fig. 8 and Fig. 9, in other embodiments, impedor 212 and 216, can be resistance, electric capacity, or inductance wherein selects one or combination institute forms.For example impedor 212 is respectively that an electric capacity and an inductance form with correcting element 216, or impedor 212 by an electric capacity in parallel with a resistance form, and correcting element 216 by an electric capacity, with an inductance, connected form.
Referring to Figure 10, is the circuit diagram of the analog-to-digital conversion circuit of the tool temperature sensing of of the present invention 1 the 5th embodiment.As shown in the figure, what the analog-to-digital conversion circuit 6 of the tool temperature sensing of the present embodiment was different from the second embodiment locates, and is that the analog-to-digital conversion circuit 6 of the tool temperature sensing of the present embodiment comprises a current source 60.Current source 60 is according to temperature generation current I
1(t), the electric current I of current source 60
1(t) flow into an analog-to-digital conversion circuit 70, make analog-to-digital conversion circuit 70 according to electric current I
1(t) produce digital output signal.
Moreover the analog-to-digital conversion circuit 70 of the present embodiment comprises an operation amplifier unit 700, a current source 702, an electric capacity 704, a sample circuit 706, a treatment circuit 708 and a clock generating circuit 710.Operation amplifier unit 700 has an inverting input, an output terminal and a normal phase input end, and the inverting input of operation amplifier unit 700 and normal phase input end couple respectively current source 60 and common mode voltage Vcm.Current source 702 has a first end and one second end, the first end of current source 702 couples the inverting input of operation amplifier unit 700, the second termination of current source 702 is received reference voltage Vref 2 or Vref3, wherein reference voltage Vref 3 can be no-voltage, reference voltage Vref 1 can equate for essence with Vref2, current source 702 generation one electric current I
2, and electric current I (t)
2(t) flow into operation amplifier unit 700.Electric capacity 704 has a first end and one second end, and the first end of electric capacity 704 and the second end couple respectively inverting input and the output terminal of operation amplifier unit 700.So, the electric current I that the analog-to-digital conversion circuit 70 of the present embodiment can produce by current source 60
1and electric current I (t)
2(t) produce digital output signal.Wherein, the principle how analog-to-digital conversion circuit 70 of the present embodiment produces digital output signal is described identical as the second embodiment, so will not repeat in this.
In addition, the present embodiment analog-to-digital conversion circuit 70 more comprises current source 80.Current source 80 has a first end and one second end, and the first end of current source 80 couples the inverting input of analog digital converting unit 700, and the second end of current source 80 is coupled to a reference edge, to receive reference voltage Vref 4, current source 80 generation current I
3(t), wherein, current source 60 has positive temperature coefficient (PTC), and current source 80 has negative temperature coefficient, or current source 60 has negative temperature coefficient, and current source 80 has positive temperature coefficient (PTC).In the present embodiment, current source 60I
2(t) electric current I produced
1(t) flow into analog-to-digital conversion circuit 70, and the electric current I that current source 80 produces
3(t) flow out analog-to-digital conversion circuit 70, as for analog-to-digital conversion circuit 70 so according to electric current I
1and electric current I (t)
3(t) principle that produces digital output signal is described identical as the second embodiment, so will not repeat in this.
In sum, the analog-to-digital conversion circuit of tool temperature sensing of the present invention and electronic installation thereof receive a reference voltage by one first impedor, and produce an input current according to a temperature; One analog digital converting unit couples the first impedor, and produce a digital output signal according to input current, so, the present invention is integrated into analog-to-digital conversion circuit by one first impedor, to reduce circuit area and to reduce power consumption, and then reduce costs.
Above only own for preferred embodiment of the present invention, not be used for limiting scope of the invention process, all equalizations of doing according to the described shape of the claims in the present invention scope, structure, feature and spirit change and modify, and all should be included in claim scope of the present invention.
Claims (22)
1. the analog-to-digital conversion circuit of a tool temperature sensing, is characterized in that, it comprises:
One first impedor, receive one first reference voltage, and produce an electric current according to a temperature; And
One analog digital converting unit, couple this first impedor, and produce a digital output signal according to this electric current.
2. analog-to-digital conversion circuit as claimed in claim 1, is characterized in that, wherein this analog digital converting unit comprises:
One first operation amplifier unit, have an input end and an output terminal, and this input end couples this first impedor;
One second impedor, have a first end and one second end, and this second impedor this first end couples this input end of this first operation amplifier unit, and this second impedor this second termination is received one second reference voltage or one the 3rd reference voltage; And
One first electric capacity, there is a first end and one second end, this first end of this first electric capacity couples this input end and this second impedor this first end of this first operation amplifier unit, and this second end of this first electric capacity couples this output terminal of this first operation amplifier unit.
3. analog-to-digital conversion circuit as claimed in claim 2, is characterized in that, wherein more comprises:
One sample circuit, couple this output terminal of this first operation amplifier unit, with an output signal that quantizes this first operational amplifier output, produces a quantification signal;
One processing unit, couple this sample circuit, and produce this numeral output signal according to this quantification signal; And
One clock generating circuit, couple this sample circuit, and produce a frenquency signal according to this quantification signal, to control this second impedor, receives this second reference voltage or the 3rd reference voltage.
4. analog-to-digital conversion circuit as claimed in claim 3, is characterized in that, wherein this first reference voltage equates with this second reference voltage essence, and the 3rd reference voltage is no-voltage.
5. analog-to-digital conversion circuit as claimed in claim 2, is characterized in that, it more comprises:
One first correcting circuit, couple this first impedor, to proofread and correct this first impedor resistance value.
6. analog-to-digital conversion circuit as claimed in claim 5, is characterized in that, wherein this first correcting circuit comprises:
At least one the first correcting element, couple this first impedor; And
At least one the first change-over switch, be parallel to this first correcting element, with this first correcting element of conduction and cut-off.
7. analog-to-digital conversion circuit as claimed in claim 2, is characterized in that, it more comprises:
One the 3rd impedor, have a first end and one second end, and the 3rd impedor this first end couples this input end of this first operation amplifier unit, and the 3rd impedor this second termination is received one the 4th reference voltage.
8. analog-to-digital conversion circuit as claimed in claim 7, is characterized in that, wherein this first reference voltage equates with this second reference voltage essence, and the 3rd reference voltage and the 4th reference voltage are no-voltage.
9. analog-to-digital conversion circuit as claimed in claim 7, is characterized in that, it more comprises:
One first correcting circuit, couple this first impedor, to proofread and correct this first impedor resistance value;
One first compensating circuit, couple this second impedor, and to should the first correcting circuit and compensate this second impedor resistance value; And
One second compensating circuit, couple the 3rd impedor, and to should the first correcting circuit and this first compensating circuit and compensate the 3rd impedor resistance value.
10. analog-to-digital conversion circuit as claimed in claim 9, is characterized in that, wherein this first compensating circuit comprises:
At least one the first compensating switch, be coupled to this second impedor, and according to this first correcting circuit conduction and cut-off.
11. analog-to-digital conversion circuit as claimed in claim 9, is characterized in that, wherein this second compensating circuit comprises:
At least one the second compensating switch, be coupled to the 3rd impedor, and according to this first correcting circuit conduction and cut-off.
12. analog-to-digital conversion circuit as claimed in claim 7, it is characterized in that, wherein this first impedor has a positive temperature coefficient (PTC), and the 3rd impedor has a negative temperature coefficient, or this first impedor has this negative temperature coefficient, and the 3rd impedor has this positive temperature coefficient (PTC).
13. analog-to-digital conversion circuit as claimed in claim 7, is characterized in that, it more comprises:
One the 4th impedor, couple this output terminal of this first operation amplifier unit;
One second operation amplifier unit, have an input end and an output terminal, and this input end of this second operation amplifier unit couples the 4th impedor;
One the 5th impedor, there is a first end and one second end, the 5th impedor this first end couples this input end and the 4th impedor of this second operation amplifier unit, and the 5th impedor this second termination is received one the 5th reference voltage or one the 6th reference voltage; And
One second electric capacity, there is a first end and one second end, this first end of this second electric capacity couples this input end, the 4th impedor and the 5th impedor of this second operation amplifier unit, and this second end of this second electric capacity couples this output terminal of this second operation amplifier unit.
14. analog-to-digital conversion circuit as claimed in claim 13, it is characterized in that, wherein this first reference voltage, this second reference voltage equate with the 5th reference voltage essence, and the 3rd reference voltage, the 4th reference voltage and the 6th reference voltage are no-voltage.
15. analog-to-digital conversion circuit as claimed in claim 1, is characterized in that, wherein this analog-to-digital conversion circuit be one continuous time the trigonometric integral modulator.
16. an electronic installation, is characterized in that, it comprises:
One first impedor, receive one first reference voltage, and produce an electric current according to a temperature;
One analog digital converting unit, couple this first impedor, and produce a digital output signal according to this electric current; And
One treatment circuit, couple this analog digital converting unit, and produce a processing signal according to this numeral output signal.
17. electronic installation as claimed in claim 16, is characterized in that, wherein this analog digital converting unit comprises:
One first operation amplifier unit, have an input end and an output terminal, and this input end couples this first impedor;
One second impedor, have a first end and one second end, and this second impedor this first end couples this input end of this first operation amplifier unit, and this second impedor this second termination is received one second reference voltage or one the 3rd reference voltage; And
One first electric capacity, there is a first end and one second end, this first end of this first electric capacity couples this input end and this second impedor this first end of this first operation amplifier unit, and this second end of this first electric capacity couples this output terminal of this first operation amplifier unit.
18. electronic installation as claimed in claim 17, is characterized in that, wherein this analog digital converting unit more comprises:
One sample circuit, couple this output terminal of this first operation amplifier unit, with an output signal that quantizes this first operational amplifier output, produces a quantification signal;
One processing unit, couple this sample circuit, and produce this numeral output signal according to this quantification signal; And
One clock generating circuit, couple this sample circuit, and produce a frenquency signal according to this quantification signal, to control this second impedor, receives this second reference voltage or the 3rd reference voltage.
19. electronic installation as claimed in claim 16, is characterized in that, wherein this treatment circuit is a gas sensor, a light source sensor, a pressure transducer or a gravity sensor.
20. the analog-to-digital conversion circuit of a tool temperature sensing, is characterized in that, it comprises:
One first current source, produce an electric current according to a temperature; And
One analog digital converting unit, couple this first current source, and produce a digital output signal according to this electric current.
21. analog-to-digital conversion circuit as claimed in claim 20, is characterized in that, it more comprises:
One second current source, have a first end and one second end, and this first end of this second current source couples an input end of this analog digital converting unit, and this second end of this second current source is coupled to a reference edge.
22. analog digital as claimed in claim 21 is changed circuit, it is characterized in that, wherein this first current source has a positive temperature coefficient (PTC), and this second current source has a negative temperature coefficient, or this first current source has this negative temperature coefficient, and this second current source has this positive temperature coefficient (PTC).
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| CN201310204508.9A CN103499991B (en) | 2013-05-24 | 2013-05-24 | The analog-to-digital conversion circuit of tool temperature sensing and electronic installation thereof |
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| CN103499991B CN103499991B (en) | 2016-01-06 |
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| US10224951B2 (en) | 2016-01-08 | 2019-03-05 | Analog Devices Global | Configurable input range for continuous-time sigma delta modulators |
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| CN103499991B (en) | 2016-01-06 |
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