CN106160742A - The data reading circuit of gas sensor and detection device - Google Patents
The data reading circuit of gas sensor and detection device Download PDFInfo
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- CN106160742A CN106160742A CN201510189340.8A CN201510189340A CN106160742A CN 106160742 A CN106160742 A CN 106160742A CN 201510189340 A CN201510189340 A CN 201510189340A CN 106160742 A CN106160742 A CN 106160742A
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- semiconductor element
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- data reading
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Abstract
The invention provides the data reading circuit of a kind of gas sensor, including: the current input module of two-way same current is provided；One outfan terminating described first loop, the gas sensing resistance of other end ground connection；The outfan of the described second servo loop of termination after the series connection of multiple thyrites, the other end is by a counteracting resistance eutral grounding；Operational amplifier, two inputs connect described first loop and the output voltage of second servo loop respectively, receive two output voltages are compared and are exported and compares voltage；This is compared voltage and judges that voltage compares with presetting by Approach by inchmeal logic, after the digital signal sequences controlling each thyrite being carried out Approach by inchmeal calibration according to comparative result, and the digital signal exported as this circuit.Operational amplifier simply plays a degenerative effect, and system is not had any impact by the nonlinear characteristic of operational amplifier, and thyrite is also adopted by numerically controlled mode, eliminates the non-linear factor that simulation controls to bring.
Description
Technical field
The present invention relates to integrated circuit technique, particularly relate to data reading circuit and the detection device of a kind of gas sensor.
Background technology
Sensor parameters currently mainly is all by being amplified the output signal of sensor, is then exported by analog-digital converter and to realize.Owing to the linear operating region of operational amplifier is extremely limited, it is bigger that nonlinear area exports impact to the data of gas sensor.Because the resistance of gas sensor is changing into linear changing relation with gas solubility, traditional mode is by after amplifier by this signal, then output signal is obtained by analog-digital converter, but in this course, amplifier nonlinearity characteristic have impact on the linear character of final output signal, typically require at amplifier linear gauging added behind circuit, and the nonlinear characteristic of operational amplifier is accurately to calculate, even if adding linear gauging circuit, the impact of amplifier nonlinearity characteristic can not be completely eliminated.
Summary of the invention
Present invention aim at providing the data reading circuit of a kind of gas sensor, effectively eliminate the impact that circuit is caused by operational amplifier nonlinear area.
The invention provides the data reading circuit of a kind of gas sensor, including:
Current input module, is connected to power supply and the first loop of output same current and second servo loop including input；
Gas sensing resistance, one terminates the outfan in described first loop, other end ground connection；
Multiple thyrites, the outfan of the described second servo loop of termination after the series connection of the plurality of thyrite, the other end is by a counteracting resistance eutral grounding, the resistance Geometric Sequence arrangement concatenation of the plurality of thyrite；
First operational amplifier, two inputs connect described first loop and the output voltage of second servo loop respectively, receive two output voltages are compared and are exported and compares voltage；
Approach by inchmeal logic, it is connected with thyrite each described, receive and described compare voltage and under the excitation of clock signal, this is compared voltage and judges that voltage compares with presetting, after the digital signal sequences controlling each thyrite being carried out Approach by inchmeal calibration according to comparative result, the digital signal exported as this circuit.
Preferably, described Approach by inchmeal logic meets below equation when the digital signal sequences of each thyrite carries out Approach by inchmeal calibration:
As Vx ＞ VDD/2, Dout'=Dout+2m/2n+1；
As Vx ＜ VDD/2, Dout'=Dout-2m/2n+1；
Wherein, in formula, VDD is supply voltage, VDD/2 judges voltage for presetting, Vx is the comparison voltage of the first operational amplifier output, and Dout is the digital signal of front primary calibration, and Dout' is when the digital signal of previous calibration, m is the figure place of output digit signals, n is the number of times compared, and stops calibration as n >=N and exports data, and N is the number of thyrite.
Specifically, the plurality of thyrite being connected in series, its each resistance arranges in Geometric Sequence from small to large to the outfan connecing described second servo loop from the one end connecing described counteracting resistance.
Specifically, described current input module includes current mirror circuit, the second operational amplifier and band-gap reference, wherein,
Described current mirror circuit includes the first controllable semiconductor element being arranged on described first loop and the second controllable semiconductor element being arranged on described second servo loop, the pole that controls of described second controllable semiconductor element and the first controllable semiconductor element connects the outfan of described second operational amplifier, the negative input of described second operational amplifier terminates described band-gap reference, and positive input terminates the outfan in described first loop.
Specifically, described first controllable semiconductor element and described second controllable semiconductor element are P-type mos field effect transistor, the source electrode of described first controllable semiconductor element and described second controllable semiconductor element connects power supply altogether, the grid of described first controllable semiconductor element and described second controllable semiconductor element draining respectively as described first loop and the outfan of described second servo loop as described control pole, described first controllable semiconductor element and described second controllable semiconductor element.
Further, described current input module also includes that the first electric capacity, described first electric capacity are connected between outfan and the ground of described second operational amplifier.
Specifically, use bipolar transistor as band-gap reference.
Further, also include that the second electric capacity, described second electric capacity are connected between outfan and the ground of described first operational amplifier.
Further, also including compensating module, this compensating module controls described counteracting resistance to eliminate the skew of described gas sensing resistance.
Present invention also offers a kind of detection device, including the data reading circuit of above-mentioned gas sensor.
The data reading circuit of above-mentioned gas sensor, operational amplifier simply plays a degenerative effect, system is not had any impact by the nonlinear characteristic of operational amplifier, and thyrite is also adopted by numerically controlled mode, eliminates the non-linear factor that simulation controls to bring.Compared with calibrating with traditional+1 or-1, Approach by inchmeal logic circuit can greatly speed up the time of calibration.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the data reading circuit of gas sensor in present pre-ferred embodiments.
Detailed description of the invention
In order to make the technical problem to be solved in the present invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, present pre-ferred embodiments detects the data reading circuit that the invention provides a kind of gas sensor being equipped with set by device, this circuit solution based on resistance calibration, has effectively eliminated the shadow that circuit is caused by operational amplifier nonlinear area.This circuit includes: current input module 11, gas sensing resistance R0, multiple thyrite R1～Rn, the first operational amplifier U1, Approach by inchmeal logic 12.
Current input module 11 includes that input is connected to power vd D and the first loop 11A and second servo loop 11B of output same current.
Gas sensing resistance, one terminates the outfan of described first loop 11A, other end ground connection；The outfan of the described second servo loop 11B of termination after the plurality of thyrite R1～Rn series connection, the other end is by a counteracting resistance Rc ground connection, the resistance Geometric Sequence arrangement concatenation of the plurality of thyrite R1～Rn；First operational amplifier U1, two inputs connect described first loop 11A and the output voltage of second servo loop 11B respectively, receive two output voltages are compared and are exported and compares voltage；Approach by inchmeal logic 12 is connected with thyrite R1～Rn each described, and receive and described compare voltage and under the excitation of clock signal 13, this is compared voltage and judges that voltage compares with presetting, according to comparative result, the digital signal sequences controlling each thyrite R1～Rn is carried out Approach by inchmeal calibration.
After calibration completes, the resistance of gas sensing resistance R0 is identical plus the resistance offsetting resistance with thyrite R1～Rn of series connection, and the digital signal sequences now controlling thyrite R1～Rn is the digital signal of circuit output.Such as gas sensing resistance R0=Rc+312R, the Serial No. of output by for 312 binary one 00111000.In this example, the resistance of definition R1 is R, then R2, R3 ... the resistance of Rn-1, Rn is respectively as follows: 4R, 8R ... 2n-1R、2nR.Compared with calibrating with traditional+1 or-1, Approach by inchmeal logic circuit can greatly speed up the time of calibration.First operational amplifier U1 has been the effect of comparing, and system is not had any impact by the nonlinear characteristic of operational amplifier, and thyrite R1～Rn is also adopted by numerically controlled mode, eliminates the non-linear factor that simulation controls to bring.
In the present embodiment, data reading circuit also includes compensating module 14, and this compensating module 14 controls the described counteracting resistance Rc offset resistance with the described gas sensing resistance R0 of elimination, improves system linearity degree.
It addition, the negative input end of the first operational amplifier U1 and positive input terminal connect the first loop 11A and the outfan of second servo loop 11B respectively.
Current input module 11 includes current mirror circuit the 112, second operational amplifier U2 and band-gap reference 114.Described current mirror circuit 112 includes the first controllable semiconductor element M1 being arranged on the first loop 11A and the second controllable semiconductor element M2 being arranged on described second servo loop 11B, the pole that controls of described second controllable semiconductor element M2 and the first controllable semiconductor element M1 connects the outfan of described second operational amplifier U2, the negative input of described second operational amplifier U2 terminates described band-gap reference 114, and positive input terminates the outfan of described first loop 11A.Specifically, use bipolar transistor as band-gap reference 114.
Specifically, described first controllable semiconductor element M1 and described second controllable semiconductor element M2 is P-type mos field effect transistor, the source electrode of described first controllable semiconductor element M1 and described second controllable semiconductor element M2 connects power supply altogether, the grid of described first controllable semiconductor element M1 and described second controllable semiconductor element M2 draining respectively as described first loop 11A and the outfan of described second servo loop 11B as described control pole, described first controllable semiconductor element M1 and described second controllable semiconductor element M2.
Further, described current input module 11 also includes that the first electric capacity C1, described first electric capacity C1 are connected between outfan and the ground of described second operational amplifier U2.First electric capacity C1 is used for stabilisation systems.
In a preferred embodiment, it is also associated with the second electric capacity C2 for stabilisation systems between outfan and the ground of described first operational amplifier U1.
In the present embodiment, the plurality of thyrite being connected in series, its each resistance arranges in Geometric Sequence from small to large to the outfan meeting described second servo loop 11B from the one end connecing described counteracting resistance.With reference to Fig. 1, the resistance of definition R1 is R, then R2, R3 ... the resistance of Rn-1, Rn is respectively as follows: 4R, 8R ... 2n-1R、2nR。
It addition, Approach by inchmeal logic 12 meets below equation when the digital signal sequences of each thyrite R1～Rn carries out Approach by inchmeal calibration:
As Vx ＞ VDD/2, Dout'=Dout+2m/2n+1；
As Vx ＜ VDD/2, Dout'=Dout-2m/2n+1；
Wherein, in formula, VDD is supply voltage, VDD/2 judges voltage for presetting, Vx is the comparison voltage of the first operational amplifier U1 output, and Dout is the digital signal of front primary calibration, and Dout' is when the digital signal of previous calibration, m is the figure place of output digit signals, n is the number of times compared, and stops calibration as n >=N and exports data, and N is the number of thyrite.
In the present embodiment, band-gap reference 112 provides a reference voltage for whole circuit, negative feedback effect by the second operational amplifier U2, gas sensing resistance R0 is made to keep consistent with the high level of thyrite, the second operational amplifier U2 output owing to being connected with reference voltage is simultaneously connected with two identical P-type mos field effect transistor M1 and M2, so this field effect transistor has identical grid voltage, source electrode is powered by power supply simultaneously, drain electrode is due to the feedback effect of the second operational amplifier U2, drain voltage also can keep consistent substantially, owing to field effect transistor is operated in saturation region, even if drain voltage has little bit different, but grid and source voltage are the most always, it can be ensured that the loop current at the two field effect transistor place is equal.
Because the resistance opening quick resistance of gas sensor is changing into linear changing relation with gas solubility, traditional mode is by after operational amplifier by this signal, then output signal is obtained by analog-digital converter, but in this course, the nonlinear characteristic of operational amplifier have impact on the linear character of final output signal, typically require at amplifier linear gauging added behind circuit, and the nonlinear characteristic of operational amplifier is accurately to calculate, even if adding linear gauging circuit, the impact of amplifier nonlinearity characteristic can not be completely eliminated.And in this programme, operational amplifier U2 simply plays a degenerative effect, system is not had any impact by the nonlinear characteristic of operational amplifier, and thyrite R1～Rn is also adopted by numerically controlled mode, eliminates the non-linear factor that simulation controls to bring.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (10)
1. the data reading circuit of a gas sensor, it is characterised in that including:
Current input module, is connected to power supply and first loop and second of output same current including input
Loop；
Gas sensing resistance, one terminates the outfan in described first loop, other end ground connection；
Multiple thyrites, the outfan of the described second servo loop of termination after the series connection of the plurality of thyrite,
The other end is by a counteracting resistance eutral grounding, the resistance Geometric Sequence arrangement concatenation of the plurality of thyrite；
First operational amplifier, two inputs connect the output electricity of described first loop and second servo loop respectively
Receive two output voltages are compared and export and compare voltage by pressure；
Approach by inchmeal logic, is connected with thyrite each described, receive described compare voltage and clock believe
Number excitation under, by this compare voltage with preset judge voltage compare, according to comparative result to control each
After the digital signal sequences of individual thyrite carries out Approach by inchmeal calibration, the digital signal exported as this circuit.
2. the data reading circuit of gas sensor as claimed in claim 1, it is characterised in that described by
Secondary logic of approaching meets following public affairs when the digital signal sequences of each thyrite carries out Approach by inchmeal calibration
Formula:
As Vx > VDD/2 time, Dout'=Dout+2m/2n+1；
When Vx < during VDD/2, Dout'=Dout-2m/2n+1；
Wherein, in formula, VDD is supply voltage, and VDD/2 judges voltage for presetting, and Vx is the first operation amplifier
The comparison voltage of device output, Dout is the digital signal of front primary calibration, and Dout' is when the numeral letter of previous calibration
Number, m is the figure place of output digit signals, and n is the number of times compared, and stops calibration as n >=N and exports number
According to, N is the number of thyrite.
3. the data reading circuit of gas sensor as claimed in claim 1 or 2, it is characterised in that should
Multiple thyrites being connected in series, its each resistance is from connecing one end of described counteracting resistance to connecing described second
The outfan in loop arranges in Geometric Sequence from small to large.
4. the data reading circuit of gas sensor as claimed in claim 1 or 2, it is characterised in that institute
State current input module and include current mirror circuit, the second operational amplifier and band-gap reference, wherein,
Described current mirror circuit includes being arranged in the first controllable semiconductor element on described first loop and cloth
Put the second controllable semiconductor element on described second servo loop, described second controllable semiconductor element and first
The pole that controls of controllable semiconductor element connects the outfan of described second operational amplifier, described second operation amplifier
The negative input of device terminates described band-gap reference, and positive input terminates the outfan in described first loop.
5. the data reading circuit of gas sensor as claimed in claim 4, it is characterised in that described the
One controllable semiconductor element and described second controllable semiconductor element are P-type mos field effect
Pipe, the source electrode of described first controllable semiconductor element and described second controllable semiconductor element meets power supply, institute altogether
State the grid of the first controllable semiconductor element and described second controllable semiconductor element as described control pole, institute
State the drain electrode of the first controllable semiconductor element and described second controllable semiconductor element respectively as described first time
Road and the outfan of described second servo loop.
6. the data reading circuit of gas sensor as claimed in claim 4, it is characterised in that described electricity
Stream input module also includes that the first electric capacity, described first electric capacity are connected on the outfan of described second operational amplifier
And between ground.
7. the data reading circuit of gas sensor as claimed in claim 4, it is characterised in that use double
Polar transistor is as band-gap reference.
8. the data reading circuit of gas sensor as claimed in claim 1 or 2, it is characterised in that also
Including the second electric capacity, described second electric capacity is connected between outfan and the ground of described first operational amplifier.
9. the data reading circuit of gas sensor as claimed in claim 1 or 2, it is characterised in that also
Including compensating module, this compensating module controls described counteracting resistance to eliminate the skew of described gas sensing resistance.
10. a detection device, it is characterised in that include the air-sensitive described in any one of claim 1 to 9
The data reading circuit of sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510189340.8A CN106160742A (en) | 2015-04-20 | 2015-04-20 | The data reading circuit of gas sensor and detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510189340.8A CN106160742A (en) | 2015-04-20 | 2015-04-20 | The data reading circuit of gas sensor and detection device |
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| CN201510189340.8A Pending CN106160742A (en) | 2015-04-20 | 2015-04-20 | The data reading circuit of gas sensor and detection device |
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