CN204517764U - A kind of enlarge leadingly filter circuit for DIT - Google Patents
A kind of enlarge leadingly filter circuit for DIT Download PDFInfo
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- CN204517764U CN204517764U CN201520184132.4U CN201520184132U CN204517764U CN 204517764 U CN204517764 U CN 204517764U CN 201520184132 U CN201520184132 U CN 201520184132U CN 204517764 U CN204517764 U CN 204517764U
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Abstract
The utility model relates to weak signal processing technology field, especially a kind of enlarge leadingly filter circuit being applied to DIT.It comprises for making circuit keep good frequency characteristic and ensureing that circuit has the input stage circuit of high input impedance and the instrument amplifying circuit for carrying out amplification filtering process to signal; Input stage circuit adopts the input stage of wallman circuit as circuit of Differential Input, and the input access induction logging signal of described input stage circuit, output connect instrument amplifying circuit; Instrument amplifying circuit is made up of four operational amplifiers and discrete component.Input stage circuit of the present utility model adopts the wallman circuit of Differential Input as the input stage of circuit, not only makes system have good frequency characteristic, and improves input impedance; Instrument amplifying circuit carries out amplification filtering process to signal, makes circuit have higher accuracy and stability, for the subsequent treatment of signal provides guarantee.
Description
Technical field
The utility model relates to weak signal processing technology field, especially a kind of enlarge leadingly filter circuit being applied to DIT.
Background technology
In induction logging instrument, the induced signal that receiving coil receives is produced by the eddy current on stratum, and formation conductivity is less, and the induced electromotive force produced in receiving coil is also less, and therefore the induced signal that receives of receiving coil is very little.
There is the shortcoming of input impedance step-down in order to the common-base amplification circuit obtaining good frequency characteristic and use in existing enlarge leadingly filter circuit, and the internal noise of the components and parts used in circuit causes very large impact to circuit, make the precision of circuit and stability not high.
Utility model content
For above-mentioned the deficiencies in the prior art, the purpose of this utility model be to provide a kind of accuracy and stability high, not only make circuit maintain good frequency characteristic, and ensure that circuit has the enlarge leadingly filter circuit for DIT of higher input impedance.
To achieve these goals, the utility model adopts following technical scheme:
Be applied to an enlarge leadingly filter circuit for DIT, it is characterized in that: it comprises for making circuit keep good frequency characteristic and ensureing that circuit has the input stage circuit of high input impedance and the instrument amplifying circuit for carrying out amplification filtering process to signal;
Described input stage circuit adopts the input stage of wallman circuit as circuit of Differential Input, and the input access induction logging signal of described input stage circuit, output connect described instrument amplifying circuit.
Preferably, described input stage circuit comprises the first field effect transistor and the second amplifying triode;
The base stage of described first field effect transistor connects that supply voltage positive pole, base stage to be also connected the base stage of the first field effect transistor by the first electric capacity, the 3rd electric capacity successively with the second electric capacity, emitter connects described instrument amplifying circuit by described second amplifying triode successively by the first resistance, the second resistance;
Preferably, described instrument amplifying circuit comprises the first operational amplifier, the second operational amplifier, the 3rd operational amplifier and four-operational amplifier;
The in-phase input end of described first operational amplifier connects the output of described input stage circuit by the 4th electric capacity and connects the inverting input of described 3rd operational amplifier, output respectively by the in-phase input end that the 5th resistance to be connected the inverting input of the first operational amplifier with the 8th electric capacity, output also connects described second operational amplifier by the 6th electric capacity by the 3rd grounding through resistance, inverting input by the 11 resistance;
The in-phase input end of described second operational amplifier connects by the 12 resistance the inverting input of described four-operational amplifier, output to be connected the second operational amplifier inverting input respectively by the 9th resistance and the tenth electric capacity by the 7th grounding through resistance, inverting input;
The in-phase input end of described 3rd operational amplifier connects the output of described input stage circuit by the 5th electric capacity and to be connected respectively by the 9th electric capacity the output of the 3rd operational amplifier, output to connect described four-operational amplifier in-phase input end by the 7th electric capacity by the 4th grounding through resistance, inverting input with the 6th resistance;
The inverting input of described four-operational amplifier is connected the output of four-operational amplifier respectively by the 11 electric capacity and the tenth resistance.
Preferably, described first field effect transistor is 2N5434 type field effect transistor, and described second amplifying triode is 2N930A type triode.
Preferably, described first operational amplifier, the second operational amplifier, the 3rd operational amplifier and four-operational amplifier are HA-5104 type operational amplifier.
Owing to have employed such scheme, input stage circuit of the present utility model adopts the wallman circuit of Differential Input as the input stage of circuit, not only makes system have good frequency characteristic, and improves input impedance; Instrument amplifying circuit carries out amplification filtering process to signal, makes circuit have higher accuracy and stability, for the subsequent treatment of signal provides guarantee.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model embodiment;
Fig. 2 is the input stage circuit structure chart of the utility model embodiment;
Fig. 3 is the instrument amplification circuit structure figure of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As shown in Figure 1, a kind of enlarge leadingly filter circuit being applied to DIT of the present embodiment, it comprises for making circuit keep good frequency characteristic and ensureing that circuit has the input stage circuit 1 of high input impedance and the instrument amplifying circuit 2 for carrying out amplification filtering process to signal;
Input stage circuit 1 adopts the input stage of wallman circuit as circuit of Differential Input, and the input access induction logging signal of input stage circuit 1, output connect described instrument amplifying circuit 2.
Wherein, input stage circuit 1 adopts the input stage of wallman circuit as circuit of Differential Input, not only makes system have good frequency characteristic, and improves input impedance; Instrument amplifying circuit 2 pairs of signals carry out amplification filtering process, make circuit have higher accuracy and stability, for the subsequent treatment of signal provides guarantee.
As shown in Figure 2, the input stage circuit 1 of the present embodiment comprises the first field effect transistor TR1 and the second amplifying triode TR2.The base stage of the first field effect transistor TR1 connects that supply voltage V1 positive pole, base stage to be also connected the base stage of the first field effect transistor TR1 by the first electric capacity C1, the 3rd electric capacity C3 successively with the second electric capacity C2, emitter connects instrument amplifying circuit 2 by the second amplifying triode TR2 successively by the first resistance R1, the second resistance R2.
In order to be amplified good frequency characteristic in circuit, common-base amplification circuit should be used, but frequency characteristic well just means the input impedance step-down of amplifying circuit, the input stage circuit 1 of the present embodiment adopts the input stage of wallman circuit as circuit of difference, not only make system have good frequency characteristic, and improve input impedance.First electric capacity C1, the second electric capacity C2 in figure, the 3rd electric capacity C3 are the equivalent interelectrode capacitance of the first field effect transistor TR1.
Further, high, that noise factor the is little 2N5434 type field effect transistor of first field effect transistor employing input impedance reduces the impact that internal noise causes circuit well, and the second amplifying triode selects the 2N930A type triode played a decisive role to the frequency of wallman circuit.
As shown in Figure 3, the instrument amplifying circuit 2 of the present embodiment comprises the first operational amplifier U1, the second operational amplifier U2, the 3rd operational amplifier U3 and four-operational amplifier U4; First operational amplifier, the second operational amplifier, the 3rd operational amplifier and four-operational amplifier all select the HA-5104 type operational amplifier of high-performance, low noise.
The in-phase input end of the first operational amplifier U1 connects the output of input stage circuit 1 by the 4th electric capacity C4 and connects the inverting input of the 3rd operational amplifier U3, output respectively by the in-phase input end that the 5th resistance R5 to be connected the inverting input of the first operational amplifier U1 with the 8th electric capacity C8, output also connects the second operational amplifier U2 by the 6th electric capacity C6 by the 3rd resistance R3 ground connection, inverting input by the 11 resistance R11.
The in-phase input end of the second operational amplifier U2 connects by the 12 resistance R12 the inverting input of four-operational amplifier U4, output to be connected the second operational amplifier U2 inverting input respectively by the 9th resistance R9 and the tenth electric capacity C10 by the 7th resistance R7 ground connection, inverting input.
The in-phase input end of the 3rd operational amplifier U3 connects the output of input stage circuit 1 by the 5th electric capacity C5 and to be connected respectively by the 9th electric capacity C9 the output of the 3rd operational amplifier U3, output to connect four-operational amplifier U4 in-phase input end by the 7th electric capacity C7 by the 4th resistance R4 ground connection, inverting input with the 6th resistance R6.
The inverting input of four-operational amplifier U4 is connected the output of four-operational amplifier U4 respectively by the 11 electric capacity C11 and the tenth resistance R10.
The instrument amplifying circuit 2 that the amplification of signal is made up of the first operational amplifier U1, the second operational amplifier U2, the 3rd operational amplifier U3 and four-operational amplifier U4 and discrete component realizes, divide two-stage to amplify, amplify in every one-level simultaneously and all carry out bandpass filtering.
Because induction logging frequency is 20KHz, in order to eliminate high and low frequency noise, need to design band pass filter, the 4th electric capacity C4 in figure and the 3rd resistance R3 forms high-pass filtering circuit, 8th electric capacity C8 and the 11 resistance R11 forms low-pass filter circuit, for stress release treatment, improve accuracy and the stability of circuit.
Further, first operational amplifier U1, the second operational amplifier U2, the 3rd operational amplifier U3 and four-operational amplifier U4 all select the HA-5104 type operational amplifier of high-performance, low noise, the total power broadband of HA-5104 type operational amplifier is 47KHz, the signal of induction logging is 20KHz, meets the demands completely.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (5)
1. be applied to an enlarge leadingly filter circuit for DIT, it is characterized in that: it comprises for making circuit keep good frequency characteristic and ensureing that circuit has the input stage circuit of high input impedance and the instrument amplifying circuit for carrying out amplification filtering process to signal;
Described input stage circuit adopts the input stage of wallman circuit as circuit of Differential Input, and the input access induction logging signal of described input stage circuit, output connect described instrument amplifying circuit.
2. a kind of enlarge leadingly filter circuit being applied to DIT as claimed in claim 1, is characterized in that: described input stage circuit comprises the first field effect transistor and the second amplifying triode;
The base stage of described first field effect transistor connects that supply voltage positive pole, base stage to be also connected the base stage of the first field effect transistor by the first electric capacity, the 3rd electric capacity successively with the second electric capacity, emitter connects described instrument amplifying circuit by described second amplifying triode successively by the first resistance, the second resistance;
3. a kind of enlarge leadingly filter circuit being applied to DIT as claimed in claim 1, is characterized in that: described instrument amplifying circuit comprises the first operational amplifier, the second operational amplifier, the 3rd operational amplifier and four-operational amplifier;
The in-phase input end of described first operational amplifier connects the output of described input stage circuit by the 4th electric capacity and connects the inverting input of described 3rd operational amplifier, output respectively by the in-phase input end that the 5th resistance to be connected the inverting input of the first operational amplifier with the 8th electric capacity, output also connects described second operational amplifier by the 6th electric capacity by the 3rd grounding through resistance, inverting input by the 11 resistance;
The in-phase input end of described second operational amplifier connects by the 12 resistance the inverting input of described four-operational amplifier, output to be connected the second operational amplifier inverting input respectively by the 9th resistance and the tenth electric capacity by the 7th grounding through resistance, inverting input;
The in-phase input end of described 3rd operational amplifier connects the output of described input stage circuit by the 5th electric capacity and to be connected respectively by the 9th electric capacity the output of the 3rd operational amplifier, output to connect described four-operational amplifier in-phase input end by the 7th electric capacity by the 4th grounding through resistance, inverting input with the 6th resistance;
The inverting input of described four-operational amplifier is connected the output of four-operational amplifier respectively by the 11 electric capacity and the tenth resistance.
4. a kind of enlarge leadingly filter circuit being applied to DIT as claimed in claim 2, it is characterized in that: described first field effect transistor is 2N5434 type field effect transistor, described second amplifying triode is 2N930A type triode.
5. a kind of enlarge leadingly filter circuit being applied to DIT as claimed in claim 3, is characterized in that: described first operational amplifier, the second operational amplifier, the 3rd operational amplifier and four-operational amplifier are HA-5104 type operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520184132.4U CN204517764U (en) | 2015-03-30 | 2015-03-30 | A kind of enlarge leadingly filter circuit for DIT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520184132.4U CN204517764U (en) | 2015-03-30 | 2015-03-30 | A kind of enlarge leadingly filter circuit for DIT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204517764U true CN204517764U (en) | 2015-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520184132.4U Expired - Fee Related CN204517764U (en) | 2015-03-30 | 2015-03-30 | A kind of enlarge leadingly filter circuit for DIT |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204517764U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043985A (en) * | 2015-08-04 | 2015-11-11 | 宁波摩米创新工场电子科技有限公司 | Multistage symmetric amplification type digital photoelectric detection system |
| CN107918968A (en) * | 2017-10-27 | 2018-04-17 | 广州畅阳电子科技有限公司 | A kind of Coin identifying apparatus and recognition methods |
-
2015
- 2015-03-30 CN CN201520184132.4U patent/CN204517764U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043985A (en) * | 2015-08-04 | 2015-11-11 | 宁波摩米创新工场电子科技有限公司 | Multistage symmetric amplification type digital photoelectric detection system |
| CN107918968A (en) * | 2017-10-27 | 2018-04-17 | 广州畅阳电子科技有限公司 | A kind of Coin identifying apparatus and recognition methods |
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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: 20150729 Termination date: 20160330 |
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| CF01 | Termination of patent right due to non-payment of annual fee |