CN107094017A - A kind of Sensing interface system of multipurpose super low-power consumption - Google Patents
A kind of Sensing interface system of multipurpose super low-power consumption Download PDFInfo
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- CN107094017A CN107094017A CN201710177497.8A CN201710177497A CN107094017A CN 107094017 A CN107094017 A CN 107094017A CN 201710177497 A CN201710177497 A CN 201710177497A CN 107094017 A CN107094017 A CN 107094017A
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- circuit
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- sensing
- sensing interface
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/002—Provisions or arrangements for saving power, e.g. by allowing a sleep mode, using lower supply voltage for downstream stages, using multiple clock domains or by selectively turning on stages when needed
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/34—Analogue value compared with reference values
- H03M1/38—Analogue value compared with reference values sequentially only, e.g. successive approximation type
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- Analogue/Digital Conversion (AREA)
Abstract
The invention discloses a kind of Sensing interface system of multipurpose super low-power consumption, it may be programmed the two or more sensors of adaptation and signal modulation obtain environmental variance, it is characterised in that：The Sensing interface system is made up of front end sensing circuit, second order Zoom adc circuits and digital dock control circuit, the wherein V of front end sensing circuitBEWith Δ VBETwo output ends access the sampling input of second order Zoom adc circuits, and the control bit signal that digital dock control circuit is produced by clock generation distinguishes time-division transfer front end sensing circuit and the running of second order Zoom adc circuits, second order Zoom adc circuits are output as numeric type environmental variance.Using the Sensing interface system of the present invention, circuit is controlled by digital dock, control ADC realizes that same chip gathers different environmental variances at times, saved the entire area of chip；Analog-digital converter circuit structure is optimized, conversion time is reduced, system power dissipation is reduced；With higher level of integrated system and boundless application space.
Description
Technical field
The present invention relates to a kind of sensor interface system, more particularly to it is a kind of programmable and adaptation multiple sensors ultralow
Power loss signal conditioning system, belongs to Internet of Things signal modulation technique field.
Background technology
In the epoch of the scientific and technological high speed development of Internet of Things, sensor has become people's row as the foundation stone of Internet of Things industry
An essential part in industry operation and life.But, the mainstream sensor circulated in the market can only all be tested single
Environmental variance, such as temperature sensor, pressure sensor etc..And a usual sensor node needs to test multiple environment changes
Amount, so system-level architecture certainly will be carried out using multiple chips.But such power consumption for selecting undoubtedly to improve sensor node
And volume, it is unfavorable for reducing the power consumption and miniaturized design of sensor node.
The content of the invention
The purpose of the present invention be overcome the shortcomings of prior art exist there is provided a kind of Sensing interface of multipurpose super low-power consumption
System, the problem of solving adaptation multiple sensors and super low-power consumption signal condition.
The purpose of the present invention is achieved through the following technical solutions：A kind of Sensing interface system of multipurpose super low-power consumption,
The programmable two or more sensors of adaptation and signal modulation acquisition environmental variance, it is characterised in that：The Sensing interface system by
Front end sensing circuit, second order Zoom adc circuits and digital dock control circuit composition, the wherein V of front end sensing circuitBEAnd Δ
VBETwo output ends access the sampling input of second order Zoom adc circuits, and digital dock controls circuit by clock generation
The control bit signal difference time-division transfer front end sensing circuit of generation and the running of second order Zoom adc circuits, the second order Zoom
Adc circuit is output as numeric type environmental variance.
Further, the second order Zoom adc circuits are by a successive approximation register pattern number converter and one
The compound combinational circuit of calculus modulation type analog-digital converter.
Further, two analog-digital converters in the second order Zoom adc circuits are multiplexed first integrator and ratio
Second integration of calculus modulation type analog-digital converter is skipped compared with device, and during the work of successive approximation register pattern number converter
Device.
Further, the Sensing interface system corresponding temperature sensing modes, the front end sensing circuit is by biasing circuit
Constituted with temperature-sensitive circuit two parts, wherein biasing circuit is provided with two identical PNP pipe QLBAnd QRBTo connecting and respectively
Flow into IbElectric current and Pb·IbElectric current；Temperature-sensitive circuit is provided with two identical PNP pipe QLAnd QRTo connecting and by IbElectricity
Stream is with 1:P ratio flows into PNP pipe QLAnd QR, and in QLBEmitter stage be connected to resistance Rb, the voltage difference of PNP pipe base-emitter
It is designated as VBE, two PNP pipe base-emitter voltage differences are designated as Δ VBEAnd with temperature positive correlation.
Further, an amplifier for being used for making two branch voltages in left and right equal is provided with the biasing circuit.
Further, the Sensing interface system correspondence capacitance sensing pattern, keeps the second order Zoom adc circuits
Sampling input is VDDAnd sampling capacitance is replaced for testing capacitance.
Further, the Sensing interface system corresponding voltage sensing modes, the sampling of the second order Zoom adc circuits
Input receives the V for surveying voltage and front end sensing circuit respectivelyBE、∆VBE。
Above-mentioned technical proposal of the present invention has prominent substantive distinguishing features and significant progressive, table compared to prior art
It is now：Circuit structure is clearly simple, and circuit is controlled by digital dock, and control ADC realizes different functions, realizes same chip
Different environmental variances are gathered at times, have saved the entire area of chip；Analog-digital converter circuit structure is optimized, is reduced
Conversion time, reduces system power dissipation.The present invention has higher level of integrated system, in intelligence sensor field and sensor section
The integrated aspect of point has boundless application space.
Brief description of the drawings
Fig. 1 is the topological diagram of the Sensing interface system of multipurpose super low-power consumption of the present invention.
Fig. 2 is the circuit diagram of front end sensing circuit used in Sensing interface system of the present invention.
Fig. 3 is of the invention in test temperature, the running schematic diagram of second order Zoom adc circuits.
Fig. 4 is of the invention in testing capacitor, the running schematic diagram of second order Zoom adc circuits.
Fig. 5 is of the invention in test voltage, the running schematic diagram of second order Zoom adc circuits.
Embodiment
Its core of innovation and technique effect is more readily understood for the control method that makes Switching Power Supply of the present invention, with reference to attached
Figure is described further to multiple specific embodiments of technical solution of the present invention.
The Sensing interface system of multipurpose super low-power consumption of the present invention is mainly made up of three parts：Front end sensing circuit, two
Rank Zoom adc circuits and digital dock control circuit.The topology diagram of whole system is as shown in Figure 1.
Either which kind of sensor, is all finally that environmental variance is transformed into voltage, such as pressure sensor is to press
Power is transformed into voltage, and temperature sensor is into voltage etc. by temperature transition.Although the output voltage of leading portion may be somewhat different,
It is that processing to these voltages is essentially identical, is required for an analog-digital converter that voltage is transformed at data signal
Reason.Therefore, it is feasible using same Zoom ADC.Second order Zoom ADC of the present invention are posted by an Approach by inchmeal
Storage pattern number converter（SAR ADC are sketched hereinafter）With a calculus modulation type analog-digital converter（Sigma is sketched hereinafter
delta ADC）, therefore the data of output are divided into coarse modulated and accurate adjustment two parts.Analog-digital converter first passes through SAR ADC and obtained
Coarse modulated number, then obtains accurate adjustment number by sigma delta ADC again.SAR ADC and sigma delta ADC multiplexings the
One integrator and comparator, SAR ADC skip sigma delta ADC second integrator when working.Second order Zoom
ADC introducing, the difficulty of system design is reduced by the form of scaling, and shortens conversion time, reduces power consumption, together
When the saving of chip area is realized by multiplexing device.
Embodiment one, test temperature.
It is illustrated in figure 2 front end sensing circuit figure.Front end sensing circuit is mainly used to test temperature information, by biasing circuit
With temperature-sensitive circuit two parts composition.In biasing（Pre-Bias）In circuit, two identical PNP pipe QLBAnd QRBFlow respectively
Cross IbElectric current and pb·IbElectric current, QLBAnd QRBV is produced because electric current is differentBEDifference, i.e. Δ VBE, wherein pbFor particular factor,
Only as difference IbAnd exist.The voltage difference V of base stage-emitter stage of triodeBEIt is negatively correlated with temperature（CTAT）, and two
Individual transistor base-emitter voltage difference VBEIt is positively related with temperature（PTAT）.Ideally, they can be with table
It is shown as：
（1）
（2）
Wherein η is the non-linear factor related to technique, and k is Boltzmann constant, and q is unit charge amount, ISIt is triode
Reverse saturation current, ICIt is collector current.By introducing an amplifier, the approximate suitable spy of amplifier input terminal voltage is utilized
Property, make left and right branch voltage suitable.Then VBEEmitter resistance R can be equal tobVoltage, so Ib=∆VBE/RbIt is a PTAT
Electric current, thereby guarantees that electric current IbWith temperature positive correlation.PTAT current is copied into temperature-sensitive（Bipolar-Core）In circuit, with 1：
P ratio flows into two identical PNP pipes（QLAnd QR）, produce two VBE（VBELAnd VBER）.The voltage difference of the two voltages
VBEWith temperature positive correlation, temperature information is obtained from there through VBE is calculated.
During such as Fig. 3 for test temperature, the running schematic diagram of second order Zoom adc circuits.Wherein, CsFor sampling capacitance, Cint
For integrating capacitor, Cint=2*Cs.The present invention utilizes Zoom ADC, passes through VBETo quantify VBE, obtain temperature information.Its result X
（=VBE/∆VBE）It is about 28 to 8 in military temperature range, and is non-linear value.Ratio μPTATIt can be regarded as in digital back-end
μPTAT=X/ (α+X), wherein α are calibration factor.Because μPTATOnly with temperature into slight non-linear, so only passing through coefficient of first order
The measurement to temperature can be achieved in calibration.
Embodiment two, testing capacitor.
The function of capacitance sensor extensively, can be with induction pressure, humidity, acceleration etc., it is only necessary to replacement test electric capacity
Realize different functions.During testing capacitor and extra front-end circuit is not needed.Only need to Zoom ADC sample integration electricity
Appearance is substituted for testing capacitor.
When Fig. 4 is testing capacitor, the running schematic diagram of second order Zoom adc circuits.CSensor, pFor testing capacitance.Due to connecing
Voltage difference at electric capacity two ends is fixed, and is all VDD.Zoom ADC can compare C by two phase place sample integrationSensor, pWith k
CsSize, finally give output valve as X（=CSensor, p/Cs）.Because circuit knows CsSize, it is possible to obtain to be measured
The absolute value of electric capacity.C during circuit designsFixed, Zoom ADC maximum output scope is N, so the testing capacitor model of system
Enclose for N*Cs, adjust N or Cs, system can be made to meet the application scenarios of most of testing capacitors.
Embodiment three, test voltage
The system of the present invention has possessed the output voltage V of a high-precision adc and high linearityBEAnd VBE, therefore can realize
Measurement directly to external voltage.Also, system can also obtain many environmental variances, example merely by measurement voltage
Such as wheatstone bridge type pressure sensor.
When Fig. 5 is test voltage, the running schematic diagram of second order Zoom adc circuits.VextIt is voltage to be measured.Due to -70
DEG C when, VBEOnly 29mV, full test voltage ratio is relatively limited.So to realize 1.8V maximum input voltage, it is necessary to carry out
Scale twice.Scale V for the first timeextWith VBECompare, for the second time by Vext-m·VBEWith VBECompare.Assuming that input voltage is
VDD, it is only necessary to limited electric capacity sampling VBE, remaining electric capacity remain unchanged sampling VBE, you can meet VDDInput voltage test.So
Zoom ADC maximum output is adjusted, system is met application scenarios requirement.Final output voltage Vext=m·VBE+n·∆
VBE, V when wherein m is scales for the first timeextWith VBERatio relation, n for for the first time scale after residual voltage（Vext-mVBE）With
∆VBERatio relation, m and n have collectively constituted VextNumeral output.
In the present invention, different sensor circuits is integrated, realizes and tests varying environment on the same chip
Variable, has greatly saved the area of chip and has reduced power consumption.Meanwhile, the present invention is used as test using second order Zoom ADC
ADC, Zoom ADC have saved circuit area, have shortened conversion time by way of multiplexing device and scaling.The present invention is in intelligence
Energy sensor field and the integrated aspect of sensor node have boundless application space.
It is to be understood that：Described above is only the preferred embodiment of the present invention, for the common of the art
For technical staff, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improve and moistened
Decorations also should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of Sensing interface system of multipurpose super low-power consumption, may be programmed the two or more sensors of adaptation and signal modulation is obtained
Environmental variance, it is characterised in that：The Sensing interface system is by front end sensing circuit, second order Zoom adc circuits and digital dock
Control circuit composition, the wherein V of front end sensing circuitBEWith Δ VBETwo output ends access the sampling of second order Zoom adc circuits
Input, and the control bit signal that digital dock control circuit is produced by clock generation distinguishes time-division transfer front end sensing
Circuit and the running of second order Zoom adc circuits, the second order Zoom adc circuits are output as numeric type environmental variance.
2. the Sensing interface system of multipurpose super low-power consumption according to claim 1, it is characterised in that：The second order Zoom
Adc circuit is by a successive approximation register pattern number converter and the compound group of a calculus modulation type analog-digital converter
Close circuit.
3. the Sensing interface system of multipurpose super low-power consumption according to claim 2, it is characterised in that：The second order Zoom
Two analog-digital converters in adc circuit are multiplexed first integrator and comparator, and successive approximation register type analog-to-digital conversion
Device skips second integrator of calculus modulation type analog-digital converter when working.
4. the Sensing interface system of multipurpose super low-power consumption according to claim 1, it is characterised in that：The Sensing interface system
System corresponding temperature sensing modes, the front end sensing circuit is made up of biasing circuit and temperature-sensitive circuit two parts, wherein biased electrical
Road is provided with two identical PNP pipe QLBAnd QRBTo connecting and separately flowing into IbElectric current and Pb·IbElectric current；Temperature-sensitive electricity
Road is provided with two identical PNP pipe QLAnd QRTo connecting and by IbElectric current is with 1:P ratio flows into PNP pipe QLAnd QR, and
In QLBEmitter stage be connected to resistance Rb, the voltage difference of PNP pipe base-emitter is designated as VBE, two PNP pipe base-emitter electricity
Pressure difference is designated as Δ VBEAnd with temperature positive correlation.
5. the Sensing interface system of multipurpose super low-power consumption according to claim 4, it is characterised in that：In the biasing circuit
Provided with for making an equal amplifier of two branch voltages in left and right.
6. the Sensing interface system of multipurpose super low-power consumption according to claim 1, it is characterised in that：The Sensing interface
System correspondence capacitance sensing pattern, the sampling input for keeping the second order Zoom adc circuits is VDDAnd replace sampling capacitance and be
Testing capacitance.
7. the Sensing interface system of multipurpose super low-power consumption according to claim 1, it is characterised in that：The Sensing interface
System corresponding voltage sensing modes, the sampling input of the second order Zoom adc circuits receives survey voltage and front end sensing respectively
The V of circuitBE、∆VBE。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710177497.8A CN107094017A (en) | 2017-03-23 | 2017-03-23 | A kind of Sensing interface system of multipurpose super low-power consumption |
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| CN201710177497.8A CN107094017A (en) | 2017-03-23 | 2017-03-23 | A kind of Sensing interface system of multipurpose super low-power consumption |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731833A (en) * | 2018-04-19 | 2018-11-02 | 上海申矽凌微电子科技有限公司 | A kind of distal end CMOS temperature measuring circuits |
| CN113108926A (en) * | 2021-03-26 | 2021-07-13 | 江苏银河芯微电子有限公司 | Temperature measuring device and method and remote temperature measuring system |
| CN113381757A (en) * | 2021-05-26 | 2021-09-10 | 杭州微纳核芯电子科技有限公司 | Power consumption self-sensing method and system |
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| KR101358744B1 (en) * | 2011-12-09 | 2014-02-10 | 한양대학교 산학협력단 | A High Resolution Image Sensor using Analog-Digital Converters |
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Non-Patent Citations (3)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731833A (en) * | 2018-04-19 | 2018-11-02 | 上海申矽凌微电子科技有限公司 | A kind of distal end CMOS temperature measuring circuits |
| CN113108926A (en) * | 2021-03-26 | 2021-07-13 | 江苏银河芯微电子有限公司 | Temperature measuring device and method and remote temperature measuring system |
| CN113381757A (en) * | 2021-05-26 | 2021-09-10 | 杭州微纳核芯电子科技有限公司 | Power consumption self-sensing method and system |
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