CN101001080A - Programme-controlled gain charge amplifier based on computer system bus - Google Patents
Programme-controlled gain charge amplifier based on computer system bus Download PDFInfo
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Abstract
This invention discloses a program control gain charge amplifier based on the computer system bus, which is divided into two module circuits: a signal amplified module circuit, a bus communication module circuit, in which, the signal amplified module circuit includes a program control charge amplifying pole, a program control with a high pass active filter stage, a low pass active filter stage and a program control phase inversion amplifying pole, the bus communication module circuit includes a bus general interface stage, a decoding stage, input-output stage and an analog switch stage. This invention is convenient to be integrated in a unified computer system with other instruments based on the computer system bus to constitute a set of high integrated device, which can form a signal amplification array on a same system bus managed by unified software.
Description
One, technical field
The present invention relates to a kind of charge amplifier, relate in particular to a kind of programme-controlled gain charge amplifier based on computer bus system.
Two, background technology
Piezoelectric can be as sensing element, again can be as exciting element, and can form composite material, have broad application prospect.Therefore the piezoelectric transducer of being made by piezoelectric has a extensive future, and has been widely used in the middle of the actual engineering now.
Piezoelectric transducer is a high impedance generating element that can produce electric charge, and the quantity of electric charge that it produces is little, and therefore, the quantity of electric charge on the piezoelectric transducer is easy to discharge by the input resistance of measuring circuit.Have only when input impedance is very high, just might measure the quantity of electric charge that changes come.The output of piezoelectric transducer generally has voltage and two kinds of forms of electric charge, has the high input impedance instrument of voltage amplifier and two kinds of forms of charge amplifier supporting with it accordingly.
For voltage amplifier, the signal frequency of piezoelectric transducer is high more, and measure error is more little, so there is the lower frequency limit scope in it.Also this reason just in the follow-up amplifying circuit of piezoelectric transducer, more is to use charge amplifier.The existing charge amplifier mostly is independently instrument, has the independent current source module, and power supply is provided by external power supply equipment or industrial 220V alternating current.This independent instrument volume is big, and its gain needs manual adjustments.Also have some charge amplifiers to be made into an embedded system, regulate gain by Single Chip Microcomputer (SCM) program, they have the independent current source module equally, and power supply also is to be provided by external power supply equipment or industrial 220V alternating current.The charge amplifier of these two kinds of forms is not easy to be integrated in the miscellaneous equipment as independent instrument, makes that apparatus structure is huge when a large amount of use piezoelectric transducers carry out engineering test, complexity, and instrument management inconvenience.This has just required a kind of charge amplifier, can be used for the signal of amplification piezoelectric formula transducer, and this charge amplifier wants volume little, and their power supply no longer needs to re-use in addition stabilized power supply device to be provided, and does not also have the power module of oneself; Gain can be by the program adjustment; When using a plurality of such charge amplifier, can have they are carried out unified management by unified software.The present invention arises under this background just.
Three, summary of the invention
1, technical problem: the technical problem to be solved in the present invention provides and a kind ofly can be integrated in the miscellaneous equipment, simplify the relevant devices structure of using piezoelectric transducer, the also programme-controlled gain charge amplifier of communication can link to each other with computer bus.
2, technical scheme: in order to solve above-mentioned technical problem, the programme-controlled gain charge amplifier based on computer system bus of the present invention is divided into two modular circuits: the one, and signal amplification module circuit, the 2nd, bus communication module circuit; In signal amplification module circuit, the charge signal of extraneous piezoelectric transducer is converted into voltage signal later on through the programmed charges amplifying stage, through program control amplifying stage it is amplified again, the high and low frequency that is exaggerated signal for filtering disturbs, design a high pass active filter and low-pass active filter and form band pass filter, therefore signal amplification module circuit one is divided into level Four, with each sheet operational amplifier chip is one-level: the first order is the programmed charges amplifying stage, the second level is the program control amplification high pass active power filtering level of holding concurrently, the third level is a low pass active power filtering level, and the 4th utmost point is program control anti-phase amplifying stage.The signal of extraneous piezoelectric transducer is handled through hold concurrently high pass active power filtering level, low pass active power filtering level and program control anti-phase amplifying stage of programmed charges amplifying stage, program control amplification successively, in the programmed charges amplifying stage, the branch road that the input of the first operational amplifier chip and output are parallel with resistance and are composed in series by first analog switch and feedback capacity; In program control anti-phase amplifying stage, the input of four-operational amplifier chip and output are parallel with the branch road that is composed in series by second analog switch and resistance; The quantity of switch can be chosen according to actual needs in first analog switch and second analog switch.This modular circuit first order and the fourth stage are that to come the electric capacity, resistance parameter of regulating circuit to realize by the control analog switch program control, and it is program control that the second level is that direct input digit control signal realizes.
The bus communication module circuit can be divided into 4 grades altogether: the first order is a bus general-purpose interface level; The second level is decode stage; The third level is the output input stage; The fourth stage is the analog switch level.When needs divide gain to carry out when program control to signal amplifying part, operation gain-adjusted program, this program experiences following process realization gain-adjusted then: program command produces a program control signal collection by the computer microprocessor compiling link and after carrying out by microprocessor, has comprised all information relevant with gain-adjusted in this set of signals and has comprised program control signal, address signal, enable signal; The program control signal collection send the bus common interface chip to handle by computer system bus in the first order bus general-purpose interface level of bus communication module circuit; The bus common interface chip sends to second level decode stage and writes enable command (at this moment reading to enable to close), sends program control signal and address signal simultaneously; Enable the decoder of corresponding address according to address signal; The decoder that is enabled sends the output enable instruction to the output latch of third level output input stage; Read control signal after output latch enables and a program control signal part latched and output to analog switch; Analog switch opens and closes respective switch according to program control signal; A part is directly inputted to the program-controlled amplifier chip of signal amplifying part modular circuit.
In the time need monitoring to the gain-state of current demand signal enlarging section modular circuit, the gain-state program is read in operation, program experiences following process and realizes that gain-state reads then: program command is by the computer microprocessor compiling link and produce one by microprocessor after carrying out and read set of signals, comprised all information relevant in this set of signals and comprised (address signal with reading gain-state, enable signal, gain-state signal to be determined).Reading set of signals send the bus common interface chip to handle by computer system bus in the first order bus general-purpose interface level of bus communication module circuit; The bus common interface chip sends to second level decode stage and reads enable command (at this moment write and enable to close), sends address signal simultaneously; Enable the decoder of corresponding address according to address signal; The decoder that is enabled sends the input enable command to the input buffer of third level output input stage; Read the program control signal that the gain-state signal comprises the program-controlled chip in analog switch open and-shut mode, the signal amplification module circuit after input buffer enables, and buffer memory is input to the bus common interface chip; The gain-state signal is gone forward side by side into microprocessor by bus common interface chip and bus communication after determining, returns the gain-state program that reads then.It is in order to monitor based on the gain-programmed amplifier of computer system bus whether finish gain-adjusted work on request that the gain-state of current demand signal amplifier section is monitored.
When real work, if signal frequency satisfy the requirement of voltage amplifier lower frequency limit can working voltage amplifier amplifying signal, only need introduce input from voltage input end; If do not satisfy, then signal will be introduced from the electric charge input.At the programmed charges amplifying stage, can regulate the sensitivity that feedback capacity changes the programmed charges amplifying stage by the program control analog switch.The output signal of programmed charges amplifying stage is input to the second level---the program control amplification high pass active power filtering level of holding concurrently.Program control signal is one two 0,1 digital signal, is realized the adjusting of multiplication factor by their control programmable operational amplifier chips.This one-level still realizes the function of high pass active power filtering except the function that realizes program control amplification, be the difference high-frequency amplifier of a standard.Entering the low pass active power filtering utmost point by the hold concurrently signal of high pass active power filtering level of program control amplification, is the low-pass active filter structure of a standard.This one-level and upper level have been formed active band-pass filter together.Last signal enter program control anti-phase amplifying stage with signal phase anti-phase and amplifying signal, final amplifying signal that comes out like this and input signal homophase.Because it is anti-phase that signal has successively experienced, homophase, homophase, anti-phase amplification is not so last phase place changes.In this one-level, can be in the ratio of regulating anti-phase amplification by the program control analog switch.
Program control anti-phase amplifying stage input/output terminal connects one group of zener diode respectively and plays the input and output protective effect.
First and second analog switches play the effect that connects signal amplification module circuit and bus communication module circuit.The bus communication module circuit has two-way program control signal A0, the program-controlled amplification chip of the direct input signal amplification module of A1 circuit.
3, beneficial effect: advantage of the present invention is: (1) programme-controlled gain charge amplifier volume based on computer system bus of the present invention is little, can be integrated in other instrument based on computer system bus very easily to constitute the instrument and equipment that integrated level is high in the unified computer system; (2) when using a plurality of piezoelectric transducers to carry out engineering test, a plurality of programme-controlled gain charge amplifiers based on computer system bus can be formed the signal amplifier array on same system bus, and can it be managed by unified software; (3) its programmable function makes it integrate the software systems that constitute an automatic test with other computer program; Therefore can promote piezoelectric in the structural extensive use of heavy construction.
Four, description of drawings
Fig. 1 is a signal amplification module circuit structure schematic diagram;
Fig. 2 is a bus communication module circuit structure schematic diagram;
Fig. 3 signal amplification module circuit and bus communication module circuit logic graph of a relation;
Fig. 4 gain-adjusted program and gain-state monitoring program flowchart;
Fig. 5 is based on the gain-programmed amplifier embodiment flow chart of computer system bus.
Five, embodiment
The programme-controlled gain charge amplifier based on computer system bus of present embodiment, comprise signal amplification module circuit and bus communication module circuit, wherein, as shown in Figure 1, signal amplification module circuit is divided into level Four, is that (Amp1～Amp4): the first order is the programmed charges amplifying stage to one-level, and the second level is the program control amplification high pass active power filtering level of holding concurrently with each sheet operational amplifier chip, the third level is a low pass active power filtering level, and the 4th utmost point is program control anti-phase amplifying stage.The signal of extraneous piezoelectric transducer is handled through hold concurrently high pass active power filtering level, low pass active power filtering level and program control anti-phase amplifying stage of programmed charges amplifying stage, program control amplification successively, in the programmed charges amplifying stage, the branch road that the input of the first operational amplifier chip Amp1 and output are parallel with resistance R _ f and are composed in series by first analog switch and feedback capacity, first analog switch has four switches, and four switches have the feedback capacity cf1～cf4 of different parameters to connect with four respectively; In program control anti-phase amplifying stage, the input of four-operational amplifier chip Amp4 and output are parallel with the branch road that is composed in series by second analog switch and resistance, and second analog switch has four switches, are in series with four resistance with different parameters respectively; At the programmed charges amplifying stage, can regulate 4 kinds of different feedback capacities (cf1～cf4), change the sensitivity of programmed charges amplifying stage by the program control analog switch.The output signal of programmed charges amplifying stage is input to the second level---the program control amplification high pass active power filtering level of holding concurrently.Program control signal is one two 0,1 digital signal, import from the second program-controlled amplifier chip Amp2A0, A1,11,10,01,00 respectively corresponding 8,4,2,1 times of multiplication factors, this program control signal are imported the adjusting of the program-controlled amplifier chip realization multiplication factor of this grade; In program control inverter stages, can regulate the ratio of 4 grades of anti-phase amplifications by the program control analog switch, can 1,2,4,8 times of multiplication factors of procedure Selection.So should have 4 grades of sensitivity adjustable based on the programme-controlled gain charge amplifier of bus system, 16 grades of multiplication factors be adjustable, come to 64 grades of Gain Adjustable like this.
The bus communication module circuit is divided into 4 grades: the first order is a bus general-purpose interface level; The second level is decode stage; The third level is the output input stage; The fourth stage is the analog switch level.The bus communication module circuit theory diagrams as shown in Figure 2.
By gain-adjusted program and gain-state monitoring program, the flow chart of two programs as shown in Figure 3 based on the gain-programmed amplifier of computer system bus.
When needs divide gain to carry out when program control to signal amplifying part, operation gain-adjusted program, this program experiences following process realization gain-adjusted then: program command produces a program control signal collection by the computer microprocessor compiling link and after carrying out by microprocessor, has comprised all information relevant with gain-adjusted in this set of signals and has comprised program control signal, address signal, enable signal; The program control signal collection send the bus common interface chip to handle by computer system bus in the first order bus general-purpose interface level of bus communication module circuit; The bus common interface chip sends to second level decode stage and writes enable command (at this moment reading to enable to close), sends program control signal and address signal simultaneously; Enable the decoder of corresponding address according to address signal; The decoder that is enabled sends the output enable instruction to the output latch of third level output input stage; Read control signal after output latch enables and a program control signal part latched and output to analog switch; Analog switch opens and closes respective switch according to program control signal; A part is directly inputted to the program-controlled amplifier chip Amp2 of signal amplifying part modular circuit.
In the time need monitoring to the gain-state of current demand signal enlarging section modular circuit, the gain-state program is read in operation, program experiences following process and realizes that gain-state reads then: program command is by the computer microprocessor compiling link and produce one by microprocessor after carrying out and read set of signals, comprised all information relevant in this set of signals and comprised (address signal with reading gain-state, enable signal, gain-state signal to be determined).Reading set of signals send the bus common interface chip to handle by computer system bus in the first order bus general-purpose interface level of bus communication module circuit; The bus common interface chip sends to second level decode stage and reads enable command (at this moment write and enable to close), sends address signal simultaneously; Enable the decoder of corresponding address according to address signal; The decoder that is enabled sends the input enable command to the input buffer of third level output input stage; Read the program control signal that the gain-state signal comprises the program-controlled chip in analog switch open and-shut mode, the signal amplification module circuit after input buffer enables, and buffer memory is input to the bus common interface chip; The gain-state signal is gone forward side by side into microprocessor by bus common interface chip and bus communication after determining, returns the gain-state program that reads then.It is in order to monitor based on the gain-programmed amplifier of computer system bus whether finish gain-adjusted work on request that the gain-state of current demand signal amplifier section is monitored.
Present embodiment can be divided into two kinds of working conditions: implement with graphic user interface based on the gain-adjusted program and the gain-state monitoring program of the gain-programmed amplifier of computer system bus (1); (2) gain-adjusted program and the gain-state monitoring program based on the gain-programmed amplifier of computer system bus embeds other application program as one section code.The basic procedure of these two kinds of performances as shown in Figure 5.
Working condition (1):
1. write gain-adjusted program and gain-state monitoring program graphic user interface, this graphic user interface can be used Visual C, and Visual C++ realizes.
2. move the gain of gain-adjusted program conditioning signal amplification module circuit.
3. move the gain-programmed amplifier gain-adjusted situation of gain-state monitoring program supervision based on computer system bus.
Working condition (2)
1. the code that the software environment of gain-adjusted program and the gain-state monitoring program application program to be embedded of being write as is supported embeds in the application program.Every support Visual C, the application program of Visual C++ all can embed these two programs wherein.
2. move the gain of gain-adjusted program conditioning signal amplification module circuit.
3. move the gain-programmed amplifier gain-adjusted situation of gain-state monitoring program supervision based on computer system bus.
Claims (3)
1, a kind of programme-controlled gain charge amplifier based on computer system bus, it is characterized in that, comprise signal amplification module circuit and bus communication module circuit, wherein, in the signal amplification module circuit, the signal of extraneous piezoelectric transducer is successively through the programmed charges amplifying stage, the program control amplification high pass active power filtering level of holding concurrently, low pass active power filtering level and program control anti-phase amplifying stage are handled, in the programmed charges amplifying stage, the branch road that the input of the first operational amplifier chip (Amp1) and output are parallel with resistance (Rf) and are composed in series by first analog switch and feedback capacity; In program control anti-phase amplifying stage, the input of four-operational amplifier chip (Amp4) and output are parallel with the branch road that is composed in series by second analog switch and resistance; In the bus communication module circuit, extraneous computer microprocessor produce by program control signal, address signal, the program control signal collection that enable signal is formed is after bus general-purpose interface level is handled, send enable signal and address signal to decode stage, decode stage is after the output latch of output input stage sends the output enable command signal, output latch latchs a part of program control signal of output to first analog switch and second analog switch, first analog switch and second analog switch open and close respective switch according to program control signal, the program control amplification second program-controlled amplifier chip (Amp2) of high pass active power filtering level of holding concurrently in another part program control signal input signal amplification module circuit.
2, the programme-controlled gain charge amplifier based on computer system bus as claimed in claim 1, it is characterized in that, decode stage sends the input enable command to the input buffer of output input stage, buffer memory was input to bus general-purpose interface level after input buffer read the gain-state signal of being made up of the program control signal of the program-controlled chip in analog switch open and-shut mode, the signal amplification module circuit, and the gain-state signal is gone forward side by side into microprocessor by bus general-purpose interface level and bus communication after determining.
3, the programme-controlled gain charge amplifier based on computer system bus as claimed in claim 1 is characterized in that, the program control anti-phase amplifying stage input/output terminal of signal amplification module circuit is connected to one group of zener diode respectively.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101494444B (en) * | 2009-02-20 | 2011-03-30 | 南京航空航天大学 | Program controlled power amplifier based on computer bus |
| CN102035500B (en) * | 2009-10-01 | 2014-03-12 | 邓加慧 | High anti-interference high-pass amplifier |
| CN104467717A (en) * | 2014-12-04 | 2015-03-25 | 中国航空工业集团公司第六三一研究所 | Differential charge amplifier with high precision, low temperature drift and low offset |
| CN104038162B (en) * | 2014-06-19 | 2016-10-05 | 国网四川省电力公司成都市新都供电分公司 | The signal amplification circuit of transformer station's gas concentration detection system |
| CN107565921A (en) * | 2017-10-11 | 2018-01-09 | 绍兴职业技术学院 | A kind of automatic cycle pga circuit contrasted |
| CN109347517A (en) * | 2018-11-02 | 2019-02-15 | 永州市诺方舟电子科技有限公司 | A kind of highly sensitive, anti-interference, noiseless hunting instrument receiver |
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| CN110048589A (en) * | 2019-04-24 | 2019-07-23 | 苏州浪潮智能科技有限公司 | A kind of control system and server of power supply ripple |
| CN112350690A (en) * | 2020-12-01 | 2021-02-09 | 上海交通大学 | High-order N-path band-pass filter based on switched capacitor and active capacitance-resistance up-conversion |
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| CN102522959A (en) * | 2011-12-06 | 2012-06-27 | 南京浩之德智能科技有限公司 | Peripheral component interconnect extensions for instrument (PXI)-bus-based charge amplification device |
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| AT378292B (en) * | 1980-11-03 | 1985-07-10 | Alfred Ing Kraker | OUTPUT LEVEL FOR SOUND SIGNAL LINES |
| JP2575964B2 (en) * | 1991-03-27 | 1997-01-29 | 株式会社東芝 | Solid-state imaging device |
| US5304950A (en) * | 1992-07-30 | 1994-04-19 | Hughes Aircraft Company | Low power, low noise preamplifier with offset voltage cancellation |
| US5926068A (en) * | 1997-10-16 | 1999-07-20 | Kabushiki Kaisha Toshiba | Variable gain amplifier or analog multiplexer with feedforward current blocking |
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| CN101494444B (en) * | 2009-02-20 | 2011-03-30 | 南京航空航天大学 | Program controlled power amplifier based on computer bus |
| CN102035500B (en) * | 2009-10-01 | 2014-03-12 | 邓加慧 | High anti-interference high-pass amplifier |
| CN104038162B (en) * | 2014-06-19 | 2016-10-05 | 国网四川省电力公司成都市新都供电分公司 | The signal amplification circuit of transformer station's gas concentration detection system |
| CN104467717A (en) * | 2014-12-04 | 2015-03-25 | 中国航空工业集团公司第六三一研究所 | Differential charge amplifier with high precision, low temperature drift and low offset |
| CN107565921A (en) * | 2017-10-11 | 2018-01-09 | 绍兴职业技术学院 | A kind of automatic cycle pga circuit contrasted |
| CN107565921B (en) * | 2017-10-11 | 2024-04-05 | 绍兴职业技术学院 | Automatic circulation programmable amplifying circuit capable of being compared |
| CN109347517A (en) * | 2018-11-02 | 2019-02-15 | 永州市诺方舟电子科技有限公司 | A kind of highly sensitive, anti-interference, noiseless hunting instrument receiver |
| CN109347517B (en) * | 2018-11-02 | 2021-06-25 | 永州市诺方舟电子科技有限公司 | High-sensitivity, anti-interference and noiseless line finder receiver |
| CN109388087A (en) * | 2018-11-27 | 2019-02-26 | 湖北三江航天险峰电子信息有限公司 | A kind of multichannel analog amount acquisition SIP chip |
| CN110048589A (en) * | 2019-04-24 | 2019-07-23 | 苏州浪潮智能科技有限公司 | A kind of control system and server of power supply ripple |
| CN112350690A (en) * | 2020-12-01 | 2021-02-09 | 上海交通大学 | High-order N-path band-pass filter based on switched capacitor and active capacitance-resistance up-conversion |
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| CN100442657C (en) | 2008-12-10 |
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