CN204652317U - A kind of programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal - Google Patents
A kind of programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal Download PDFInfo
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- CN204652317U CN204652317U CN201520456083.5U CN201520456083U CN204652317U CN 204652317 U CN204652317 U CN 204652317U CN 201520456083 U CN201520456083 U CN 201520456083U CN 204652317 U CN204652317 U CN 204652317U
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- circuit
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- controlled gain
- amplifying circuit
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Abstract
The utility model provides a kind of programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal, by the programme-controlled gain preamplifying circuit of connecting successively, programme-controlled gain second amplifying circuit, program control attenuator circuit and programme-controlled gain final stage amplifying circuit level Four circuit are formed, wherein programme-controlled gain preamplifying circuit by instrument amplifier and RC high-pass filtering circuit in series, programme-controlled gain second amplifying circuit is operational amplification circuit B, program control attenuator circuit by analog to digital converter and operational amplification circuit C in series, programme-controlled gain final stage amplifying circuit comprises switch element in parallel and operational amplification circuit D, the break-make of switch element control algorithm amplifying circuit D, adopt instrument amplifier to obtain small-signal as prime in this programme-controlled gain amplifying circuit, rear two-stage adopts accurate low-noise operational amplifier to form plus and blowup circuit, and intergrade inserts program control attenuator circuit, realizes multiplication factor 0 ~ 80dB program control adjustable.
Description
Technical field
The utility model relates to a kind of programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal, belongs to seismic precursor signal transacting field.
Background technology
Earthquake brings huge disaster to the life of the mankind, the security of the lives and property of the serious threat mankind, and how to predict that the generation of earthquake just highlights its necessity, this is also the expectation of the whole mankind.The generation of earthquake can be predicted between the accurate means of current seismic precursor forecasting research field neither one, necessary for new seismic precursor forecasting research, to go the generation of searching one better method prediction earthquake.
Before earthquake occurs, earth natural pulses small-signal can be used for earthquake prediction, the Geomagnetic signal that the small-signal analysis of earth natural pulses gathers comes from magnetic signal inductive pick-up, the Geomagnetic signal amplitude that transducer finally exports is very little, from several millivolts to hundred millivolts not etc., further comprises some other unnecessary noises in addition, carry out EVAC (Evacuation Network Computer Model) as lightning, high-voltage line, construction electrical equipment etc. all can produce magnetic signal.Add Geomagnetic signal itself and there is the features such as faint, fluctuation range large, source extensively, is easily disturbed, therefore need to carry out certain adjustment to the amplitude of signal, the convenient collection to signal, to obtain the front electromagnetic anomaly signal of comparatively real shake, thus carry out effectively based on the Seismogenic information time-frequency the characteristic study of earth natural pulses electromagnetic field analysis for follow-up.
Summary of the invention
The purpose of this utility model is to solve the deficiencies in the prior art, and a kind of programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal is provided, this system can effectively be amplified earth natural pulses small-signal, realize the adjustment to small signal amplitudes, for subsequent algorithm analysis provides reliable and stable signal data.
Realizing the technical scheme that the utility model object adopts is, a kind of programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal, at least comprise operational amplifier and the filter of electrical connection, programme-controlled gain amplifying circuit is by the programme-controlled gain preamplifying circuit of connecting successively, programme-controlled gain second amplifying circuit, program control attenuator circuit and programme-controlled gain final stage amplifying circuit level Four circuit are formed, wherein programme-controlled gain preamplifying circuit is made up of operational amplifier and filters in series, the output of filter is the output of programme-controlled gain preamplifying circuit, programme-controlled gain second amplifying circuit is operational amplification circuit B, program control attenuator circuit by analog to digital converter and operational amplification circuit C in series, programme-controlled gain final stage amplifying circuit comprises switch element in parallel and operational amplification circuit D, the break-make of switch element control algorithm amplifying circuit D.
The multiplication factor of described programme-controlled gain amplifying circuit is 10000 times, and wherein the multiplication factor of programme-controlled gain preamplifying circuit is 100 times, and gain setting formula is:
wherein Rg value is 499 Ω; The multiplication factor of programme-controlled gain second amplifying circuit is 10 times, and gain setting formula is:
wherein Rh value is 100 Ω, Rf value is 910 Ω; The multiplication factor of operational amplification circuit D is 10 times.
Programme-controlled gain preamplifying circuit by instrument amplifier and RC high-pass filtering circuit in series, program control attenuator circuit is the combinational circuit of multiplying-type DAC and operational amplification circuit C, and switch element is relay or analog switch.
Program control attenuator circuit is voltage-controlled circuit or analog multiplier.
As shown from the above technical solution, the programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal that the utility model provides, the earth natural pulses electromagnetic field signal that gathered transducer by programme-controlled gain amplifying circuit (feature of this signal is that amplitude is little and comprise more interference signal) carries out signal adjustment, programme-controlled gain amplifying circuit carries out three grades to signal and amplifies and insert attenuator circuit simultaneously to realize multiplication factor program control adjustable, and level Four circuit is specially:
(1) programme-controlled gain preamplifying circuit, by instrument amplifier and RC high-pass filtering circuit (300Hz) in series, its multiplication factor is 100 times, and gain setting formula is:
wherein Rg value is 499 Ω, and input signal amplitude is no more than 200mVp-p, and maximum output swing is no more than 20Vp-p;
(2) programme-controlled gain second amplifying circuit, be operational amplification circuit B or operational amplifier, its multiplication factor is 10 times, and gain setting formula is:
wherein Rh value is 100 Ω, Rf value is 910 Ω, and input signal amplitude is no more than 2Vp-p, avoids exporting cut-off because power supply reason causes;
(3) program control attenuator circuit, be the combinational circuit of multiplying-type DAC and operational amplification circuit C, this circuit has the bandwidth of MHz rank;
(4) programme-controlled gain final stage amplifying circuit, comprise switch element in parallel and operational amplification circuit D, multiplication factor is 1 times or 10 times, (signal is through operational amplification circuit D in the connection of switch element control algorithm amplifying circuit D, signal amplifies 10 times and exports afterwards) or disconnect (signal directly exports), the highest input range of signal is no more than 2Vp-p.
The programme-controlled gain amplifying circuit that the utility model provides, programme-controlled gain preamplifying circuit is instrument amplifier, there is high cmrr, feature that high input impedance, common-mode rejection ratio are directly proportional to multiplication factor, can effectively amplification sensor gather differential signal, total gain amplifier of programme-controlled gain amplifying circuit is 10000 times, wherein the amplitude of programme-controlled gain preamplifying circuit input signal is minimum, the restriction of slew rate parameter can not be subject to, this circuit has the advantages that common-mode rejection ratio is directly proportional to multiplication factor, and therefore designing gain is 100 times; Program control attenuator circuit is inserted in programme-controlled gain amplifying circuit, program control adjustable to realize multiplication factor 0 ~ 80dB by controlling attenuation parameter.
Compared with prior art, the programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal that the utility model provides, amplitude for earth natural pulses small-signal adjusts, the collecting work of Geomagnetic signal can be convenient to, instrument amplifier is adopted to obtain small-signal as prime, rear two-stage adopts accurate low-noise operational amplifier to form plus and blowup circuit, most high-amplification-factor realizes 80dB, and inserting in intergrade the program control attenuator circuit be made up of multiplying-type DAC and operational amplification circuit C, to realize multiplication factor 0 ~ 80dB program control adjustable.
Accompanying drawing explanation
The structured flowchart of the programme-controlled gain amplifying circuit that Fig. 1 provides for the utility model.
Fig. 2 is the circuit diagram of programme-controlled gain preamplifying circuit.
Fig. 3 is the circuit diagram of programme-controlled gain second amplifying circuit.
Fig. 4 is the circuit diagram of program control attenuator circuit.
Fig. 5 is the circuit diagram of programme-controlled gain final stage amplifying circuit.
Wherein, 1-instrument amplifier, 2-RC high-pass filtering circuit, 3-multiplying-type DAC, 4-operational amplification circuit C, 5-switch element, 6-operational amplification circuit D.
Embodiment
Illustrate in detail the utility model below in conjunction with drawings and Examples, content of the present utility model is not limited to following examples.
The programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal that the utility model provides, as shown in Figure 1, be made up of the programme-controlled gain preamplifying circuit of connecting successively, programme-controlled gain second amplifying circuit, program control attenuator circuit and programme-controlled gain final stage amplifying circuit level Four circuit, multiplication factor is 10000 times, wherein programme-controlled gain preamplifying circuit as shown in Figure 2, by INA128 instrument amplifier 1 and 300Hz RC high-pass filtering circuit 2 in series, multiplication factor is 100 times, and gain setting formula is:
wherein Rg value is 499 Ω, input signal amplitude is no more than 200mVp-p, maximum output swing is no more than 20Vp-p, the bias voltage of the bias voltage setting pin access setting of INA128 instrument amplifier 1, the output of RC high-pass filtering circuit is the output of programme-controlled gain preamplifying circuit, wherein INA128 instrument amplifier can substitute by other instrument amplifiers, the AD8221 of such as ADI;
Programme-controlled gain second amplifying circuit is operational amplification circuit B, and as shown in Figure 3, multiplication factor is 10 times, and gain setting formula is:
wherein Rh value is 100 Ω, Rf value is 910 Ω, and its input signal amplitude is no more than 2Vp-p, and operational amplification circuit B can substitute, as the OP177F of ADI company by other precisions, low-noise operational amplifier;
Program control attenuator circuit as shown in Figure 4, for the combinational circuit of DAC7811 multiplying-type DAC3 and OPA277 operational amplification circuit C4, wherein DAC7811 is SPI control bus, the input range that signal is the highest is 30Vp-p, wherein export and follow the amplifier that amplifier requires to select Low-bias Current, low maladjustment voltage, DAC7811 multiplying-type DAC can substitute by other similar chip, and as the AD5452 of ADI company, program control attenuator circuit can be replaced voltage-controlled circuit or analog multiplier;
Programme-controlled gain final stage amplifying circuit as shown in Figure 5, comprise switch element 5 in parallel and OPA211 operational amplification circuit D6, OPA211 realizes fixed gain 10 times amplification, carry out control signal whether by OPA211 (10 times of amplifications) or directly export by control switch element simultaneously, switch element is relay or analog switch, single-chip microcomputer is by the break-make of switch element control algorithm amplifying circuit D, the highest input range of signal is no more than 2Vp-p, OPA211 can adopt the low-noise operational amplifier that other slew rates are slightly high to substitute, as OPA228, AD817 etc.
Claims (4)
1. the programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal, at least comprise operational amplifier and the filter of electrical connection, it is characterized in that: programme-controlled gain amplifying circuit is by the programme-controlled gain preamplifying circuit of connecting successively, programme-controlled gain second amplifying circuit, program control attenuator circuit and programme-controlled gain final stage amplifying circuit level Four circuit are formed, wherein programme-controlled gain preamplifying circuit is made up of operational amplifier and filters in series, the output of filter is the output of programme-controlled gain preamplifying circuit, programme-controlled gain second amplifying circuit is operational amplification circuit B, program control attenuator circuit by analog to digital converter and operational amplification circuit C in series, programme-controlled gain final stage amplifying circuit comprises switch element in parallel and operational amplification circuit D, the break-make of switch element control algorithm amplifying circuit D.
2. the programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal according to claim 1, it is characterized in that: the multiplication factor of described programme-controlled gain amplifying circuit is 10000 times, wherein the multiplication factor of programme-controlled gain preamplifying circuit is 100 times, and gain setting formula is:
wherein Rg value is 499 Ω; The multiplication factor of programme-controlled gain second amplifying circuit is 10 times, and gain setting formula is:
wherein Rh value is 100 Ω, Rf value is 910 Ω; The multiplication factor of operational amplification circuit D is 10 times.
3. the programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal according to claim 1, it is characterized in that: programme-controlled gain preamplifying circuit by instrument amplifier and RC high-pass filtering circuit in series, program control attenuator circuit is the combinational circuit of multiplying-type DAC and operational amplification circuit C, and switch element is relay or analog switch.
4. the programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal according to claim 1, is characterized in that: program control attenuator circuit is voltage-controlled circuit or analog multiplier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520456083.5U CN204652317U (en) | 2015-06-29 | 2015-06-29 | A kind of programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520456083.5U CN204652317U (en) | 2015-06-29 | 2015-06-29 | A kind of programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204652317U true CN204652317U (en) | 2015-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520456083.5U Expired - Fee Related CN204652317U (en) | 2015-06-29 | 2015-06-29 | A kind of programme-controlled gain amplifying circuit for earth natural pulses electromagnetic field signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204652317U (en) |
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2015
- 2015-06-29 CN CN201520456083.5U patent/CN204652317U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150916 Termination date: 20200629 |