CN214154467U - Filter circuit, filter, and signal processing device - Google Patents
Filter circuit, filter, and signal processing device Download PDFInfo
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- CN214154467U CN214154467U CN202022361632.4U CN202022361632U CN214154467U CN 214154467 U CN214154467 U CN 214154467U CN 202022361632 U CN202022361632 U CN 202022361632U CN 214154467 U CN214154467 U CN 214154467U
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Abstract
The utility model relates to a wave filter technical field provides a filter circuit, wave filter and signal processing device, and filter circuit includes: a first terminal, a second terminal, a first series resonant unit, a second series resonant unit, and a basic filter element; the basic filter element is connected between the first terminal and the second terminal; the first series resonant unit is connected between the first terminal and a ground terminal; the second series resonant unit is connected between the second terminal and the ground terminal. The utility model discloses a two series resonance units utilize series resonance's characteristic to realize deciding the filtering frequently, decide that filtering performance is good frequently, and circuit structure is simple, and the device is few, and is with low costs.
Description
Technical Field
The utility model belongs to the technical field of the wave filter, especially, relate to a filter circuit, wave filter and signal processing device.
Background
The filter is used as an important element in a communication electronic system and has a very wide application range.
In the prior art, filters mostly use integrated filters as the main part, but the filtering capability of the integrated filters for specific frequency points is not very outstanding, and the cost of the integrated filters is high.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a filter circuit, a filter and a signal processing apparatus, so as to solve the problem that the fixed-frequency filtering capability of the integrated filter in the prior art is not sufficient and the cost is high.
The embodiment of the utility model provides a first aspect provides a filter circuit, include: a first terminal, a second terminal, a first series resonant unit, a second series resonant unit, and a basic filter element;
the basic filter element is connected between the first terminal and the second terminal;
the first series resonant unit is connected between the first terminal and a ground terminal;
the second series resonant unit is connected between the second terminal and a ground terminal.
Optionally, the first series resonance unit includes: a first inductance and a first capacitance connected in series.
Optionally, the second series resonant unit includes: a second inductor and a second capacitor connected in series.
Optionally, the basic filter element is a capacitor or an inductor.
Optionally, the filter circuit further includes: an optional filtering element;
the selectable filter element and the basic filter element are connected in series between the first terminal and the second terminal.
Optionally, the optional filter element is a capacitor or an inductor.
Optionally, the resonant frequency of the first series resonant unit is the same as the resonant frequency of the second series resonant unit.
Optionally, the first terminal is a signal input terminal, and the second terminal is a signal output terminal; or
The first terminal is a signal output terminal, and the second terminal is a signal input terminal.
The embodiment of the utility model provides a second aspect provides a filter, include the embodiment of the utility model provides an arbitrary kind of filter circuit in the first aspect.
The embodiment of the utility model provides a third aspect provides a signal processing device, include the embodiment of the utility model provides a wave filter that the second aspect provided.
The embodiment of the utility model provides a filter circuit, include: a first terminal, a second terminal, a first series resonant unit, a second series resonant unit, and a basic filter element; the basic filter element is connected between the first terminal and the second terminal; the first series resonant unit is connected between the first terminal and a ground terminal; the second series resonant unit is connected between the second terminal and a ground terminal. The utility model discloses a two series resonance units utilize series resonance's characteristic to realize deciding the filtering frequently, decide that filtering performance is good frequently, and circuit structure is simple, and the device is few, and is with low costs.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic diagram of a topology structure of a filter circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a first filter circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a second filter circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a third filter circuit provided in an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a fourth filter circuit provided in an embodiment of the present invention;
FIG. 6 is a diagram of the corresponding filtering effect of the filtering circuit shown in FIG. 2;
fig. 7 is a diagram of another filtering effect corresponding to the filtering circuit shown in fig. 2.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
Referring to fig. 1, an embodiment of the present invention provides a filter circuit, including: a first terminal a, a second terminal B, a first series resonant unit 11, a second series resonant unit 12, and a basic filter element 13;
said basic filtering element 13 is connected between said first terminal a and said second terminal B;
the first series resonant unit 11 is connected between the first terminal a and a ground terminal GND;
the second series resonant unit 12 is connected between the second terminal B and a ground terminal GND.
The series resonance refers to the capacitive reactance X in the series resonance circuitCAnd inductive reactance XLWhen the phases are equal, the total voltage and the current of the circuit are the same, the circuit presents pure resistance, namely short circuit, signals can pass through, and the phenomenon is series resonance. Namely, it is
The impedance angle is 0, and the circuit generates resonance phenomenon. The angular frequency at which resonance occurs is called the resonance angular frequency, ω0. The frequency at which resonance occurs is called the resonant frequency, f0. When the input signal is at f0Left and right, signals can pass through.
The embodiment of the utility model provides an utilize series resonance's characteristic, near the signal of the resonant frequency of first series resonance unit 11 and the resonant frequency of second series resonance unit 12 is grounded by the filtering, and basic filter element 13 auxiliary filter realizes deciding frequently the filtering, decides frequently that filtering performance is good, circuit structure is simple, and the device is few, and is with low costs.
In some embodiments, referring to fig. 2, the first series resonant unit 11 includes: a first inductor L1 and a first capacitor C1 connected in series.
In some embodiments, referring to fig. 2, the second series resonant unit 12 includes: a second inductor L2 and a second capacitor C2 connected in series.
The embodiment of the utility model provides an in, electric capacity and inductance are established ties and are formed first series resonance unit 11 and second series resonance unit 12, establish ties through inductance and electric capacity and realize deciding the filtering frequently.
Referring to fig. 3, in the embodiment of the present invention, the positions of the first inductor L1 and the first capacitor C1 may be reversed. Similarly, the positions of the second inductor L2 and the second capacitor C2 can be reversed.
In some embodiments, referring to fig. 2 and 4, the basic filtering element 13 may be capacitive or inductive.
The inductor has a high-frequency filter characteristic, and the capacitor has a low-frequency filter characteristic. When the basic filter element 13 is a capacitor, the low-frequency signal cannot pass through, and the low-frequency signal can be filtered; similarly, when the basic filter element 13 is an inductor, the high frequency signal cannot pass through, and the high frequency signal can be filtered. The basic filter element 13 thus assists in the filtering.
In some embodiments, the filter circuit may further include: an optional filtering element;
the optional filter element is connected in series with the basic filter element 13 between the first terminal a and the second terminal B.
In some embodiments, the selectable filtering element is a capacitor or an inductor. For example, refer to fig. 5.
The filter frequency point of the filter circuit can be adjusted by adjusting the parameters of the first inductor L1, the first capacitor C1, the second inductor L2, the second capacitor C2, the basic filter element 13 and the optional filter element.
The embodiment of the utility model provides an in set up optional filter element and basic filter element 13, realize band-pass filtering through the reasonable parameter that sets up the two.
In some embodiments, the resonant frequency of the first series resonant unit 11 and the resonant frequency of the second series resonant unit 12 may be the same.
In some embodiments, the first terminal a is a signal input terminal and the second terminal B is a signal output terminal; or
The first terminal A is a signal output end, and the second terminal B is a signal input end.
The embodiment of the utility model provides a filter circuit does not restrict the direction of access, and the commonality is better.
The filter circuit is further described with reference to specific embodiments.
For the filter circuit shown in fig. 2, for example, L1 ═ L2 ═ 2.2NH, C1 ═ C2 ═ 2.2PF, made of
It can be seen that the resonant frequencies of the first series resonant unit 11 and the second series resonant unit 12 are both 2.288GHZ, and referring to fig. 6, signals around the 2.288GHZ frequency are effectively filtered, and the fixed-frequency filtering effect is better.
When L1 is 2.2NH, C1 is 2.2PF, L2 is 2.0NH, and C2 is 2.0PF, the resonance frequency of the first series resonant unit 11 is 2.288GHZ, the resonance frequency of the second series resonant unit 12 is 2.516GHZ, and signals around 2.288GHZ and 2.516GHZ are effectively filtered with reference to fig. 7.
Therefore, the embodiment of the present invention only utilizes simple inductor and capacitor to realize fixed frequency filtering, the fixed frequency filtering effect is good, the number of devices is small, the cost is low, and the application range is very wide
Corresponding to any kind of above-mentioned filter circuit, the embodiment of the utility model provides a filter is still provided, and this filter includes any kind of above-mentioned filter circuit, and has the advantage that above-mentioned filter circuit had, no longer explains herein.
Corresponding to the above-mentioned wave filter, the embodiment of the utility model provides a still provides a signal processing device, and this signal processing device includes above-mentioned wave filter, and has the advantage that above-mentioned wave filter has, and it is no longer repeated here.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (7)
1. A filter circuit, comprising: a first terminal, a second terminal, a first series resonant unit, a second series resonant unit, and a basic filter element;
the basic filter element is connected between the first terminal and the second terminal;
the first series resonant unit is connected between the first terminal and a ground terminal;
the second series resonant unit is connected between the second terminal and a ground terminal;
the first series resonant unit includes: a first inductor and a first capacitor connected in series;
the second series resonant unit includes: a second inductor and a second capacitor connected in series;
the basic filter element is a capacitor or an inductor.
2. The filter circuit of claim 1, wherein the filter circuit further comprises: an optional filtering element;
the selectable filter element and the basic filter element are connected in series between the first terminal and the second terminal.
3. The filter circuit of claim 2, wherein the selectable filter element is a capacitor or an inductor.
4. The filter circuit according to any one of claims 1 to 3, wherein a resonance frequency of the first series resonant unit is the same as a resonance frequency of the second series resonant unit.
5. The filter circuit according to any one of claims 1 to 3, wherein the first terminal is a signal input terminal and the second terminal is a signal output terminal; or
The first terminal is a signal output terminal, and the second terminal is a signal input terminal.
6. A filter comprising a filter circuit as claimed in any one of claims 1 to 5.
7. A signal processing apparatus comprising the filter of claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022361632.4U CN214154467U (en) | 2020-10-21 | 2020-10-21 | Filter circuit, filter, and signal processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022361632.4U CN214154467U (en) | 2020-10-21 | 2020-10-21 | Filter circuit, filter, and signal processing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214154467U true CN214154467U (en) | 2021-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022361632.4U Active CN214154467U (en) | 2020-10-21 | 2020-10-21 | Filter circuit, filter, and signal processing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214154467U (en) |
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2020
- 2020-10-21 CN CN202022361632.4U patent/CN214154467U/en active Active
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