CN208479580U - Second-order filter circuit - Google Patents
Second-order filter circuit Download PDFInfo
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- CN208479580U CN208479580U CN201821580704.0U CN201821580704U CN208479580U CN 208479580 U CN208479580 U CN 208479580U CN 201821580704 U CN201821580704 U CN 201821580704U CN 208479580 U CN208479580 U CN 208479580U
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- chip
- filter circuit
- relay
- order filter
- circuit
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Abstract
The utility model discloses a kind of second-order filter circuit, the second-order filter circuit includes the first relay, the second relay, the first chip and the second chip；First chip is electronic switch chip, and second integrated chip has operational amplifier；The resistance value of filter resistance in the electronic switch chip control circuit；The capacitance of filter capacitor in first control relay circuit.The electronic switch chip and first relay are composed in series filtering front end, and the operational amplifier for reconnecting the second chip constitutes second-order filter circuit.The utility model passes through the capacitor and resistance parameter of relay and chip controls secondary filter circuit, so that second-order filter circuit be enable to be filtered for the characteristics of input signal.
Description
Technical field
The utility model relates to electronic circuit technology field more particularly to a kind of second-order filter circuits.
Background technique
Second-order filter circuit is common filter circuit, although current second-order filter circuit can reach input signal
The purpose being filtered, but second-order filter circuit is when receiving different input signals, the characteristics of input signal can not be directed to,
Corresponding adjustment is carried out to second-order filter circuit, second-order filter circuit is preferably adapted to.And adjust second-order filter electricity
The parameter on road then leads to increased costs, and technology is complicated, it is therefore desirable to the characteristics of second-order filter circuit can be according to input signal,
Carry out corresponding parameter regulation.
Utility model content
The main purpose of the utility model is to provide a kind of second-order filter circuits, it is intended to which solving second-order filter circuit can not
It the characteristics of for the problem that not messenger, is flexibly adjusted.
To achieve the above object, the utility model provides a kind of second-order filter circuit, and the second-order filter circuit includes the
One relay, the second relay, the first chip and the second chip；First chip is electronic switch chip, described second
Integrated chip has operational amplifier；The resistance value of filter resistance in the electronic switch chip control circuit；First relay
The capacitance of filter capacitor in control circuit.The electronic switch chip and first relay are composed in series filtering front end,
The operational amplifier for reconnecting the second chip constitutes second-order filter circuit.
Optionally, the second relay control control bypass circuit, the bypass circuit are controlled whether to input signal
It is filtered.
Optionally, second chip is integrated operational amplifier OPA140.
Optionally, the electronic switch chip controls the different resistance of four resistance values.
Optionally, first relay controls the different capacitor of four capacitances.
The utility model second-order filter circuit is controlled using the filter resistance and relay controlled by electronic switch chip
Filter capacitor composition filtering front end, connects operational amplifier then to form second-order filter circuit.Filter resistance and filter capacitor
Can be according to input signal the characteristics of, the capacitance of filter capacitor and the resistance value of filter resistance are adjusted, so that second-order filter is electric
Road can reach optimal filter effect according to the characteristics of input signal.Simultaneously for circuit structure without largely being modified,
Improving cost is low, significant effect.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the structural schematic diagram of one embodiment of the utility model second-order filter circuit.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
The description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and should not be understood as referring to
Show or imply its relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " are defined as a result,
Two " feature can explicitly or implicitly include at least one of the features.In addition, the technical solution between each embodiment can
It to be combined with each other, but must be based on can be realized by those of ordinary skill in the art, when the combination of technical solution occurs
Conflicting or cannot achieve when, will be understood that the combination of this technical solution is not present, also not in the guarantor of the requires of the utility model
Within the scope of shield.
The utility model proposes a kind of second-order filter circuits, and referring to Fig.1, the second-order filter circuit includes the first relay
Device, the second relay, the first chip and the second chip.First relay is used to control the filter capacitor of filter circuit connection
Capacitance.Second relay can control whether to be filtered the signal of input, can for the signal for not needing to be filtered
Directly to be exported, the model of the first relay and the second relay is IM03G.First chip is electronic switch chip,
The filter resistance of connection filter circuit is controlled by electronic switch, the first chip has the filtered electrical for controlling four different resistance values altogether
Resistance, the resistance value of four filter resistances successively differ 10 times, the model MAX309CSE of the first chip.Second integrated chip fortune
Calculate amplifier, model OPA140.
Before the filter resistance of first chip selection and the filter capacitor group of the first relay selection are connected into filter circuit
End, and filter is constituted with the operational amplifier of rear end.Signal passes through filtering front end (i.e. filter resistance and filtering after input
The front end of capacitor composition), be then attached to the positive input of operational amplifier, while the reverse input end of operational amplifier with
Output connection forms negative-feedback.First relay, the second relay and the first chip are able to use control program and are controlled
System.The voltage range of the second-order filter circuit input signal of the utility model is that -10V arrives 10V, and filter circuit has voltage
The effect of follower increases prime input impedance, reduces to late-class circuit output impedance.Improve the anti-interference of overall signal
Property.
The utility model, by the control by relay and chip, realize in filter circuit filter resistance and filtering
The size of capacitor is selected, and the characteristics of second-order filter circuit is according to input signal is enable, and the parameter for adjusting filter circuit is set
It sets, to be preferably filtered for input signal.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model,
Under all utility models in the utility model are conceived, equivalent structure made based on the specification and figures of the utility model
Transformation, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (5)
1. a kind of second-order filter circuit, which is characterized in that the second-order filter circuit include the first relay, the second relay,
First chip and the second chip；First chip is electronic switch chip, and second integrated chip has operational amplifier；
The resistance value of filter resistance in the electronic switch chip control circuit；The electricity of filter capacitor in first control relay circuit
Capacity, the electronic switch chip and first relay are composed in series filtering front end, and the operation for reconnecting the second chip is put
Big device constitutes second-order filter circuit.
2. second-order filter circuit as described in claim 1, which is characterized in that the second relay control control bypass electricity
Road, the bypass circuit control whether to be filtered input signal.
3. second-order filter circuit as described in claim 1, which is characterized in that second chip is integrated operational amplifier
OPA140。
4. second-order filter circuit as described in claim 1, which is characterized in that the electronic switch chip controls four resistance values not
Same resistance.
5. second-order filter circuit as described in claim 1, which is characterized in that first relay controls four capacitances not
Same capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821580704.0U CN208479580U (en) | 2018-09-27 | 2018-09-27 | Second-order filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821580704.0U CN208479580U (en) | 2018-09-27 | 2018-09-27 | Second-order filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208479580U true CN208479580U (en) | 2019-02-05 |
Family
ID=65208727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821580704.0U Active CN208479580U (en) | 2018-09-27 | 2018-09-27 | Second-order filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208479580U (en) |
-
2018
- 2018-09-27 CN CN201821580704.0U patent/CN208479580U/en active Active
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