CN104713579A - Universal type sensor signal processing system - Google Patents
Universal type sensor signal processing system Download PDFInfo
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- CN104713579A CN104713579A CN201410744782.XA CN201410744782A CN104713579A CN 104713579 A CN104713579 A CN 104713579A CN 201410744782 A CN201410744782 A CN 201410744782A CN 104713579 A CN104713579 A CN 104713579A
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Abstract
The invention provides a universal type sensor signal processing system which comprises a sensor interface unit, a register control unit, a data transmission interface, a digital signal processing unit, a data sending unit, a data receiving unit, a display unit and a power and power management unit. The sensor interface unit is connected with the digital signal processing unit, one end of the data sending unit is connected with the digital signal processing unit, the other end of the data sending unit is connected with the data receiving unit, and the data receiving unit is connected with the display unit; the register control unit is connected with the digital signal processing unit. According to the universal type sensor signal processing system, the portable design is adopted, the size is small, the power dissipation is low, the cost is low, different parameters can be configured for different sensors, and the detection result can be displayed in real time in a graph or data mode.
Description
Technical field
The present invention relates to electronic technology field, be specially a kind of signal processing system for polytype sensor output signal process.
Background technology
Along with the develop rapidly of the modern industry, semiconductor technology, microsystems technology, the communication technology, computer technology, as the instrument obtaining physical world information, sensor technology has become major fields of scientific research.Electric signal sensor is according to the difference exported, ampere-type sensor and volt type sensor can be divided into, corresponding output is current signal and voltage signal, the current signal that sensor detecting system pick-up transducers exports or voltage signal, form the quantitative and qualitative analysis display of Testing index after simulation process and digital processing.
In recent years, have benefited from the fast development of semiconductor integrated manufacturing technology and MEMS micro mechanical technology, sensor detecting system is towards the future development of microminaturization, and portable design is applied in the middle of environment measuring equipment, medical monitoring equipment more and more.Under the prerequisite ensureing measuring accuracy, how to select suitable each functional module device, digital signal processing method stress release treatment to disturb and subtract the aspects such as small area implementation microminiaturization to become primary study direction.
Traditional sensor detecting system adopts and realizes based on the modular system of industry standard interface or main equipment, and the feature that its volume is large, portability is poor limits its range of application.
Summary of the invention
The object of this invention is to provide the universal sensor signal processing system that a kind of volume is little, security performance good, portability is strong, this system is conducive to the miniaturization realizing sensor detecting system.
For reaching above object, technical scheme of the present invention is: a kind of universal sensor signal processing system, comprising:
Sensor interface unit, carries out rough handling and amplification for the curtage signal exported by sensor;
Register control unit, it stores the control signal from data processing unit, is the parameter that sensor interface chip configuration is different according to sensor type and sensor output signal scope;
Data transmission interface, it is as the standard communication interface of intermodule each in system, is that the data of sensor interface chip configuration are transferred to register control unit, the check processing data of transmission sensor interface chip are transferred to data receipt unit to digital signal processing unit and by the data of data transmission unit by digital signal processing unit;
Digital signal processing unit, the check processing data of its receiving sensor interface chip, complete Digital Signal Algorithm, result are stored and transfer to data transmission unit;
Data transmission unit, sends to data receipt unit by the result of digital signal processing unit;
Data receipt unit, stores the data from data transmission unit, and buffering waits for that figure and data display unit read;
Display unit, reads the data of data receipt unit buffering, carries out the graphic depiction of testing result and carries out figure and data display;
Power supply and Power Management Unit, for unit each in system is powered.
Preferably, described sensor interface unit comprises trans-impedance amplifier, integrator, programmable gain amplifier, analog to digital converter, export programmable gain amplifier after the current signal that described sensor exports inputs the process of trans-impedance amplifier sum-product intergrator respectively to amplify, then export after analog to digital converter conversion.
Preferred, described sensor interface unit also comprises voltage current adapter, if sensor output voltage signal, first convert to after current signal through voltage current adapter and transfer to trans-impedance amplifier sum-product intergrator respectively again, export programmable gain amplifier after process to amplify, export finally by after analog to digital converter conversion.
Preferred, arrange sampling holder after integrator in sensor interface unit, sensor current signal exports to programmable gain amplifier through sampling holder after integrator process.
Preferred, described sensor unit is integrated in a chip.
Preferably, described data transmission unit and data receipt unit include wireless transceiver, can long-range mutual data transmission between described universal sensor signal processing system, realize mutual calibration function.
Compared with prior art, beneficial effect of the present invention is:
(1) described universal sensor signal processing system is received the curtage signal of sensor output by sensor interface chip, change the method for the sensor interface circuitry in the past adopting multiple independent component to build, realize simulating signal through amplifying, adjusting, be finally converted to digital signal, substantially reduce area and the power consumption of interface circuit, and improve measuring accuracy;
(2) in the present invention digital signal processing unit can control sensor chip according to accessed sensor type different and output signal range and sensitivity different, to the size of integrating capacitor, the size of programmable gain amplifier gain, corresponding configuration is carried out across the size of resistance, the length of capacitance integrator integral time to the trans-impedance amplifier of its inside, realizes various kinds of sensors general;
(3) in described system, data transmission unit communicates in individual system with data receipt unit, and speed is fast, low in energy consumption; Also can support to communicate between multiple system, there is the mutual calibration function of multiple system, and can user network be formed, realize Detection Information and share.
(4) data transmission interface is the I of standard agreement
2c bus, only has clock line and data line two, by carrying out read-write operation to the register of setting address, effectively reduces the shortcomings such as the area caused because transmission data line is more is comparatively large, stray capacitance is larger.
Accompanying drawing explanation
Fig. 1 is the composition structural schematic block diagram of universal sensor signal processing system of the present invention;
Fig. 2 is the composition structural schematic block diagram of sensor interface unit of the present invention;
Fig. 3 is the scan characteristic curve map of the capacitance integrator current detecting path of sensor interface chip of the present invention;
Fig. 4 is the scan characteristic curve map of the trans-impedance amplifier current detecting path of sensor interface chip of the present invention;
Fig. 5 is the scan characteristic curve map of the trans-impedance amplifier voltage detecting path of sensor interface chip of the present invention.
Fig. 6 is the structural representation of power supply of the present invention and power management chip.
Embodiment
For convenience of the understanding of those skilled in the art, below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Figure 1, system of the present invention comprises sensor interface unit 1, register control unit 2, data transmission interface 3, digital signal processing unit 41, data transmission unit 42, data receipt unit 51, display unit 52 and power supply and Power Management Unit 6.Sensor interface unit 1 is connected with digital signal processing unit 41, and data transmission unit 42 one end connects digital signal processing unit 41, other end connection data receiving element 51, and data receipt unit 51 is connected with display unit 52; Register control unit 2 is also connected with digital signal processing unit 41.
Sensor interface unit 1 receives the output signal of sensor, after Voltage to current transducer, carries out adjustable gain amplification further, finally converts simulating signal to digital signal, and the digital signal after sensor interface unit 1 processes is via I
2c bus (data transmission interface 3) is transferred to digital signal processing unit 41; Digital signal processing unit 41 carries out signal processing algorithm, extracts original signal characteristic, and converts the Testing index of sensor to, exports to remote system or pass through I through data transmission unit 42
2c bus is exported to local display unit and is directly shown; Data transmission unit 42 and data receipt unit 51 pass through I in individual system
2c bus realizes communication, between multiple system, realize communication by wireless transceiver; Display unit 52, according to sensor type and signal processing results, is synchronously drawn Testing index motion graphics, and is shown the real-time data result of Testing index.Digital signal processing unit 41 with communicate between display unit by data transmission unit and data receiver receiving element, or data transmission unit and data receiver receiving element can be built in digital signal processing unit and display unit respectively, to realize communication.
As Fig. 2, described sensor interface unit contains the voltage current adapter of input end, trans-impedance amplifier, capacitance integrator and the programmable gain amplifier be connected successively with three's output terminal and analog to digital converter.Trans-impedance amplifier, capacitance integrator are used for directly receiving the sensor signal exported as current signal, voltage current adapter, for receiving the sensor signal exported as voltage signal, is input to trans-impedance amplifier and capacitance integrator after voltage signal being converted to current signal again.
Current signal is when trans-impedance amplifier path, gain is determined by the feedback resistance R between the output terminal of amplifier and negative input end, output voltage and input current linear, according to the design of resistance and area, this path is applicable to detecting the electric current in 1uA to 1mA scope, conversion coefficient as shown in Equation 1:
（1）
Electric current is when capacitance integrator path, gain by amplifier output terminal and negative input end integrating capacitor Citgr and integral time fs determine, integrating capacitor and timing integral time one, output voltage and input current linear, this path is applicable to detecting the small area analysis in 1n A to 1uA scope, and the output voltage of capacitance integrator is as shown in 2 formulas:
（2）
During sensor output voltage signal, sensor interface unit is the noise that reduction input signal carries, input voltage signal directly can not be accessed programmable gain amplifier to amplify, but first flow through voltage current adapter, current signal after its conversion flows through above-mentioned trans-impedance amplifier or current integrator carries out subsequent treatment, and conversion after-current is as shown in 3 formulas:
（3）
The output Vo of trans-impedance amplifier and capacitance integrator receives the input end of programmable gain amplifier, and programmable gain amplifier is sampled by electric capacity C1, C2 amplifies, and by the size of control capacittance C2, realize the programmable regulating of gain, output voltage is as shown in 4 formulas:
（4）
Fig. 3 shows the capacitance integrator current detecting path adopting the sensor interface unit, with 0.5nA step-length from the scanning detecting result during input direct-current electric current of 1nA-100nA, the output of visible light transducer interface unit presents monotone increasing change along with the linear increase of input current, and the linearity is good;
Fig. 4 shows the trans-impedance amplifier current detecting path adopting the sensor interface unit, with 0.5uA step-length from the scanning detecting result during input direct-current electric current of 1uA-30uA, the output of visible light transducer interface unit presents monotone increasing change along with the linear increase of input current, and the linearity is good;
Fig. 5 shows the trans-impedance amplifier voltage detecting path adopting the sensor interface unit, be the Output rusults of step scan 1mV-1.6V with 10mV to input voltage, find out that sensor interface unit output numerical code presents monotone decreasing change with the linear increase of input voltage from figure, there is good linearity.
Above-mentioned Fig. 3, Fig. 4 and Fig. 5 are the measurement results when current/voltage conversion coefficient and programmable gain amplifier gain are setting value, can be obtained the more high-precision measurement result in specified scope by adjustment current/voltage conversion coefficient and programmable gain amplifier gain.
During concrete enforcement, system circuit unit volume of the present invention is little, and sensor interface unit more accessible site on one chip, is made as handheld terminal, easy to use.Handheld terminal can adopt powered battery, and arranges electric power management circuit for battery.Fig. 6 is the embodiment using battery as power supply and electric power management circuit, and the vdd terminal of electric power management circuit is connected to the positive pole of battery by resistance R1, be coupled to VSS by electric capacity C1, and VSS is connected to the negative pole of battery; OD end, OC end connect the grid of N-type metal-oxide-semiconductor, and CS end connects the positive pole of battery, holds the source electrode of the N-type metal-oxide-semiconductor be connected to connect VSS hold with OD, and drain electrode connects the source electrode holding the N-type metal-oxide-semiconductor be connected with OC, and drain electrode connects the negative pole holding the resistance be connected with CS.In battery charge and discharge process, there is the excessive state of electric current or load short circuits state detected, then starting self-protection function, preventing cell damage or blast; Electric power management circuit quiescent current is little, provides system standby function, can extend battery.
System of the present invention, sensor interface unit is on a single die integrated, this chip controls by digital signal processing unit, can according to accessed sensor type, sensor output signal scope and sensitivity, to the size of integrating capacitor, the size of programmable gain amplifier gain, corresponding configuration is carried out across the size of resistance, the length of capacitance integrator integral time to the trans-impedance amplifier of its inside.Digital signal processing unit is by data transmission interface I
2c bus reads and writes data to address corresponding in register control unit, and register control unit directly transfers data to each configuration pin of sensor interface chip, makes sensor interface chip operation in optimum measurement range.
In described system, data transmission all adopts the I of standard agreement
2c bus, I
2c bus only has clock line and data line two, by carrying out read-write operation to the register of setting address, effectively reduces the shortcomings such as the area caused because transmission data line is more is comparatively large, stray capacitance is larger.
Digital signal after the process of sensor interface chip is via I
2c bus transfer is to digital signal processing unit, digital signal processing unit realizes signal processing algorithm, and stress release treatment disturbs, and extracts original signal characteristic, and demarcate or the measurement standard curve of self-calibration according to user, data are converted to the Testing index of sensor.
Data transmission unit and data receipt unit pass through I in individual system
2c bus realizes communication, and speed is fast, low in energy consumption; If user needs to communicate between multiple system, then realize communication by wireless transceiver, realize the mutual calibration function of multiple system, and can user network be formed, realize Detection Information and share.
Display unit uses LED display curtain, and low in energy consumption, reliability is strong, be easy to debugging, easily with other module integrations in a system, it receives the data cushioned from data receipt unit, draw the output data curve of digital signal processing unit, and show the real-time results of sensor measurement index.
Sensor signal disposal system of the present invention, electric current and voltage two kinds of signals can be detected, current detection range is from 1nA to 1mA, reference voltage detection is from 1mV to 1.5V, can be used for multiple different sensors, there is versatility, there is the advantage that precision is high, integrated level is high, low in energy consumption and cost is low simultaneously.
The part that the present invention does not specifically introduce all can adopt ripe functional module of the prior art.
Be more than the preferred implementation of the present invention, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these apparent replacement forms all belong to protection scope of the present invention.
Claims (9)
1. a universal sensor signal processing system, is characterized in that, comprising:
Sensor interface unit, carries out rough handling and amplification for the curtage signal exported by sensor;
Register control unit, it stores the control signal from data processing unit, is the parameter that sensor interface chip configuration is different according to sensor type and sensor output signal scope;
Data transmission interface, it is as the standard communication interface of intermodule each in system, is that the data of sensor interface chip configuration are transferred to register control unit, the check processing data of transmission sensor interface chip are transferred to data receipt unit to digital signal processing unit and by the data of data transmission unit by digital signal processing unit;
Digital signal processing unit, the check processing data of its receiving sensor interface chip, complete Digital Signal Algorithm, result are stored and transfer to data transmission unit;
Data transmission unit, sends to data receipt unit by the result of digital signal processing unit;
Data receipt unit, stores the data from data transmission unit, and buffering waits for that figure and data display unit read;
Display unit, reads the data of data receipt unit buffering, carries out the graphic depiction of testing result and carries out figure and data display;
Power supply and Power Management Unit, for unit each in system is powered.
2. universal sensor signal processing system as claimed in claim 1, it is characterized in that: described sensor interface unit comprises trans-impedance amplifier, integrator, programmable gain amplifier, analog to digital converter, export programmable gain amplifier after the current signal that described sensor exports inputs the process of trans-impedance amplifier sum-product intergrator respectively to amplify, then export after analog to digital converter conversion.
3. universal sensor signal processing system as claimed in claim 2, it is characterized in that: described sensor interface unit also comprises voltage current adapter, if sensor output voltage signal, first convert to after current signal through voltage current adapter and transfer to trans-impedance amplifier sum-product intergrator respectively again, export programmable gain amplifier after process to amplify, export finally by after analog to digital converter conversion.
4. universal sensor signal processing system as claimed in claim 2, is characterized in that: described sensor interface unit also comprises for circuit each in sensor and sensor interface unit provides the band gap reference of high-precision analog bias voltage.
5. universal sensor signal processing system as claimed in claim 2, is characterized in that: arrange sampling holder after integrator, and sensor current signal exports to programmable gain amplifier through sampling holder after integrator process.
6. as the universal sensor signal processing system in claim 1-5 as described in any one, it is characterized in that: described sensor unit is integrated in a chip.
7. universal sensor signal processing system as claimed in claim 1, is characterized in that: described data transmission interface uses the I of standard agreement
2c bus.
8. universal sensor signal processing system as claimed in claim 1, it is characterized in that: described display unit is according to sensor type and signal processing results, synchronous drafting Testing index Dynamic graphic display out, and shows the real-time data result of Testing index.
9. the universal sensor signal processing system as described in claim 1 any one, it is characterized in that: described data transmission unit and data receipt unit include wireless transceiver, can long-range mutual data transmission between described universal sensor signal processing system, realize mutual calibration function.
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| CN111141314A (en) * | 2018-11-05 | 2020-05-12 | 迈来芯科技有限公司 | Sensor interface circuit |
| CN111537571A (en) * | 2020-04-20 | 2020-08-14 | 厦门大学 | Monolithic integrated graphene gas detection amplification chip |
| CN112162141A (en) * | 2020-09-27 | 2021-01-01 | 济南浪潮高新科技投资发展有限公司 | Current detection device and circuit detection method |
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