CN203368407U - Pre-amplification circuit capable of realizing automatic gain adjustment for voltage output-type sensor - Google Patents
Pre-amplification circuit capable of realizing automatic gain adjustment for voltage output-type sensor Download PDFInfo
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- CN203368407U CN203368407U CN 201320482075 CN201320482075U CN203368407U CN 203368407 U CN203368407 U CN 203368407U CN 201320482075 CN201320482075 CN 201320482075 CN 201320482075 U CN201320482075 U CN 201320482075U CN 203368407 U CN203368407 U CN 203368407U
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Abstract
The utility model relates to a pre-amplification circuit capable of realizing the automatic gain adjustment for a voltage output-type sensor. The pre-amplification circuit comprises voltage follower circuits, a programmable amplification circuit, an A/D (analogue/digital) conversion circuit and a microcontroller, wherein a voltage signal output by the sensor is conveyed to the programmable amplification circuit by the first voltage follower circuit to be amplified, the output of the programmable amplification circuit is divided into two paths, and one path is used as the output of the pre-amplification circuit after passing through the second voltage follower circuit; the other path is used as a feedback signal after passing through the third voltage follower circuit, converted to a digital signal by the A/D conversion circuit and conveyed to the microprocessor, and the microprocessor processes data and outputs an adjustment signal to the programmable amplification circuit. The circuit is used for tracking the changes of a measured signal in real time, and also can be used for ensuring the sensitivity of the sensor, and improving the accuracy of measurement for the sensor by adjusting the gain value of the amplification circuit,.
Description
Technical field
The utility model relates to a kind of signal processing circuit, but particularly a kind of Voltage-output type sensor preamplifier circuit of automatic gain control.
Background technology
Voltage-output type transducer is a kind of checkout gear, can experience measured information, and the information that detection can be experienced, be for conversion into according to certain rules voltage signal output, with the requirements such as transmission, processing, storage, demonstration, record and control that meet information, it is to realize the primary link that automatically detects and automatically control.Generally, the transducer directly signal demand of output is amplified, with sensitivity and the accuracy that improves whole measuring system.Yet, for traditional measuring system, the yield value of sensor preamplifier circuit is fixed, when the measured signal of experiencing when transducer has larger fluctuation, its yield value can not change in time, causes the sensitivity of system and accuracy to reduce.
Summary of the invention
The utility model is for the measured signal of the Voltage-output type transducer problem that sensitivity and accuracy reduce when large that fluctuates, but a kind of Voltage-output type sensor preamplifier circuit of automatic gain control has been proposed, this circuit can the real-time tracking measured signal variation, adjust the yield value of amplifying circuit, thereby improve the sensitivity of measuring system and the accuracy of measurement result.
The technical solution of the utility model is: but a kind of Voltage-output type sensor preamplifier circuit of automatic gain control, comprise voltage follower circuit, pga circuit, the A/D change-over circuit, microcontroller, the voltage signal of transducer output is sent into pga circuit through the first voltage follower circuit and is amplified, and pga circuit divides two-way output, a road after the second voltage follow circuit as the output of pre-amplification circuit; Another road as feedback signal, is converted to digital signal through A/D and sends into microcontroller after the tertiary voltage follow circuit, and after the microcontroller deal with data, output regulation signal is to pga circuit.
Described pga circuit forms the difference input amplifying circuit by integrated operational amplifier, two resistance, two digital regulation resistances, the integrated operational amplifier end of oppisite phase connects respectively with in-phase end the resistance that resistance is identical, connect the first digit potentiometer between the integrated operational amplifier end of oppisite phase of integrated operational amplifier and output, the integrated operational amplifier in-phase end is by second digit potentiometer ground connection, and two digital potentiometer resistances are controlled in microcontroller output.
The beneficial effects of the utility model are: but the Voltage-output type sensor preamplifier circuit of the utility model automatic gain control, the variation of real-time tracking measured signal, by adjusting the yield value of amplifying circuit, guarantee the sensitivity of transducer, improve the accuracy of sensor measurement.
The accompanying drawing explanation
But the Voltage-output type sensor preamplifier circuit structured flowchart that Fig. 1 is the utility model automatic gain control;
But voltage follower circuit figure in the Voltage-output type sensor preamplifier circuit that Fig. 2 is the utility model automatic gain control;
But pga circuit figure in the Voltage-output type sensor preamplifier circuit that Fig. 3 is the utility model automatic gain control.
Embodiment
But the Voltage-output type sensor preamplifier circuit structured flowchart of automatic gain control as shown in Figure 1, the voltage signal of transducer output is after the voltage follower circuit buffering, by pga circuit, amplified, signal after amplification is divided into two-way, a road after voltage follower circuit as the output of pre-amplification circuit; Another road after voltage follower circuit as feedback signal, enter microcontroller through A/D conversion is laggard, microcontroller judges that according to the signal magnitude of input whether the gain of amplifying circuit is suitable, if suitable, keep the multiplication factor in current circuit constant, otherwise the multiplication factor of regulating pga circuit, be controlled at the output amplitude of whole amplifying circuit in suitable scope.This circuit is except be able to automatically carrying out gain-adjusted, the microprocessor of measuring system can read by the input and output control port yield value of current amplifying circuit, also can the gain Inversion of amplifying circuit be set by the input and output control port, so that carry out data analysis and process.
Fig. 2 is voltage follower circuit figure, and it has very high input impedance and extremely low output impedance, and the signal of transducer output is after the voltage follower circuit buffering, with pga circuit, be connected, better realize impedance matching, simultaneously, eliminated the impact on sensor output signal.
Signal after pga circuit amplifies has also utilized voltage follower circuit, and they are isolated by circuit output and signal feedback part, have avoided both crosstalking, and has also avoided the impact of voltage output end circuit part afterwards on its front circuit part.
Figure 3 shows that pga circuit figure, form the difference input amplifying circuit by integrated operational amplifier, resistance, digital regulation resistance, improved the common-mode rejection ratio of circuit, get R11=R13, R12=R14, the multiplication factor of this circuit is R12/R11, because the resistance of R11, R13 is fixed, therefore can regulate the resistance of R12, R14 by microcontroller, can reach the purpose of regulating circuit multiplication factor.The in-phase input end of amplifier and inverting input input resistance are identical all the time, thereby have guaranteed that this circuit has very high common-mode rejection ratio, can suppress temperature and float error simultaneously.
A/D convertor circuit is used for the voltage signal of simulation is converted to digital voltage signal, is convenient to microprocessor and carries out the data processing.The AD converter part can be selected different precision and conversion speed and reference voltage according to the difference of system applies occasion.Device is caused to damage when preventing that AD converter input terminal voltage amplitude is too high, at selected AD converter input, should add amplitude limiter circuit protected, amplitude limit value can be identical with reference voltage.
Amplifying circuit has two kinds of mode of operations, and a kind of is the automatic gain pattern, and a kind of is the fixed gain pattern, and measuring system can adopt the agreements such as serial ports, I2C or SPI to come and the microcontroller communication, controls the operating state of amplifying circuit.
Under the fixed gain pattern, measuring system is set the amplifying circuit yield value by the input and output control port in Fig. 1.Under the automatic gain pattern, microprocessor control circuit is averaging the sampled value in certain time of integration, according to the size of averaging of income value, come the voltage of decision circuit output whether in the optimum measurement scope, if just, in paying most good measuring range, keep the parameter constant of I/V change-over circuit and pga circuit; Otherwise, when mean value hour, increase multiplication factor, when mean value is larger, reduce multiplication factor.
Claims (2)
1. but the Voltage-output type sensor preamplifier circuit of an automatic gain control, it is characterized in that, comprise voltage follower circuit, pga circuit, the A/D change-over circuit, microcontroller, the voltage signal of transducer output is sent into pga circuit through the first voltage follower circuit and is amplified, pga circuit divides two-way output, a road after the second voltage follow circuit as the output of pre-amplification circuit; Another road as feedback signal, is converted to digital signal through A/D and sends into microcontroller after the tertiary voltage follow circuit, and after the microcontroller deal with data, output regulation signal is to pga circuit.
2. but the Voltage-output type sensor preamplifier circuit of automatic gain control according to claim 1, it is characterized in that, described pga circuit is by integrated operational amplifier, two resistance, two digital regulation resistances form the difference input amplifying circuit, the integrated operational amplifier end of oppisite phase connects respectively with in-phase end the resistance that resistance is identical, connect the first digit potentiometer between the integrated operational amplifier end of oppisite phase of integrated operational amplifier and output, the integrated operational amplifier in-phase end is by second digit potentiometer ground connection, two digital potentiometer type are number identical, two digital potentiometer resistances are controlled in microcontroller output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320482075 CN203368407U (en) | 2013-08-08 | 2013-08-08 | Pre-amplification circuit capable of realizing automatic gain adjustment for voltage output-type sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320482075 CN203368407U (en) | 2013-08-08 | 2013-08-08 | Pre-amplification circuit capable of realizing automatic gain adjustment for voltage output-type sensor |
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| CN203368407U true CN203368407U (en) | 2013-12-25 |
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| CN 201320482075 Expired - Fee Related CN203368407U (en) | 2013-08-08 | 2013-08-08 | Pre-amplification circuit capable of realizing automatic gain adjustment for voltage output-type sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588951A (en) * | 2014-10-23 | 2016-05-18 | 北京自动化控制设备研究所 | Molecular electronic angular accelerometer weak signal processing circuit |
| CN105997008A (en) * | 2016-06-25 | 2016-10-12 | 深圳市贝沃德克生物技术研究院有限公司 | Adaptive adjustment system and method for signals of biosensors |
| CN110954146A (en) * | 2019-12-18 | 2020-04-03 | 哈尔滨吉赫科技有限责任公司 | Method for improving sensitivity of sensor |
| CN112505351A (en) * | 2020-12-10 | 2021-03-16 | 中船航海科技有限责任公司 | Digital log system adopting open-loop amplifying circuit |
-
2013
- 2013-08-08 CN CN 201320482075 patent/CN203368407U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588951A (en) * | 2014-10-23 | 2016-05-18 | 北京自动化控制设备研究所 | Molecular electronic angular accelerometer weak signal processing circuit |
| CN105997008A (en) * | 2016-06-25 | 2016-10-12 | 深圳市贝沃德克生物技术研究院有限公司 | Adaptive adjustment system and method for signals of biosensors |
| CN110954146A (en) * | 2019-12-18 | 2020-04-03 | 哈尔滨吉赫科技有限责任公司 | Method for improving sensitivity of sensor |
| CN110954146B (en) * | 2019-12-18 | 2021-12-07 | 哈尔滨吉赫科技有限责任公司 | Method for improving sensitivity of sensor |
| CN112505351A (en) * | 2020-12-10 | 2021-03-16 | 中船航海科技有限责任公司 | Digital log system adopting open-loop amplifying circuit |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20140808 |
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| EXPY | Termination of patent right or utility model |