CN2105140U - Active filter - Google Patents
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- CN2105140U CN2105140U CN 91230170 CN91230170U CN2105140U CN 2105140 U CN2105140 U CN 2105140U CN 91230170 CN91230170 CN 91230170 CN 91230170 U CN91230170 U CN 91230170U CN 2105140 U CN2105140 U CN 2105140U
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- Prior art keywords
- order joint
- low pass
- order
- joint
- high pass
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Abstract
The utility model discloses an active filter, the basic circuit unit of which is a second order elliptic function filter section and a first order section. An HLB0.3/3.4D is orderly formed by the series connection of low pass second order sections L-[1], L-[2] and L-[3], a high pass second order section H-[1] and a high pass first order section H-[2]. An HLB0.3/12D is formed by the series connection of high pass second order sections H-[3] and H-[4], a high pass first order section H-[5], low pass second order sections L-[4] and L-[5] and a low pass first order section L-[8]. An HLB4.6/7.7D is formed by the series connection of low pass second order sections L-[7], L-[8], L-[9] and L-[10], a low pass first order section L-[11], high pass second order sections H-[6], H-[7] and H-[8] and a high pass first order section H-[9].
Description
Technical field of the present utility model is an active filter, is particularly suitable for the elliptic function active filter.
Existing filter is that second-order filter joint A(is shown in Figure 1), comprise that first integral circuit, inverter, second integral circuit are in sequential series; The first integral circuit comprises: operational amplifier N
1, resistance R
1, capacitor C
1, inverter comprises: operational amplifier N
2, resistance R
4, R
5, the second integral circuit comprises: operational amplifier N
3, resistance R
3, R
6, capacitor C
2This filter has following advantage: circuit element sensitivity is low, and the component value difference is little, and it is extremely convenient to adjust, wherein R
1Determine stopband valley point frequency, R
2Determine the passband peak dot frequency, R
3Determine acrometron, change related elements numerical value, can make low pass, high pass, band resistance filter, but be difficult for finishing the design of high-order trap, poor anti jamming capability according to the design needs.
The purpose of this utility model is to increase the trap unit, improves antijamming capability, thereby provides a kind of stable performance, the higher order filter that filtering accuracy is high.
Description of drawings:
Fig. 1: second order joint filter circuit schematic diagram.
Fig. 2: high pass single order joint H
2, H
9Circuit theory diagrams.
Fig. 3: low pass single order joint L
6, L
11Circuit theory diagrams.
Fig. 4: embodiment 1, HLB 0.3/3.4D channel bandpass filter schematic block circuit diagram
Fig. 5: embodiment 2 HLB 0.3/12D band pass filter circuit theory diagrams.
Fig. 6: embodiment 3 HLB 4.6/7.7D band pass filter circuit theory diagrams.
The amplitude-versus-frequency curve figure of Fig. 7: embodiment 1.
The amplitude-versus-frequency curve figure of Fig. 8: embodiment 2.
The amplitude-versus-frequency curve figure of Fig. 9: embodiment 3.
Figure 10: embodiment 1 circuit theory diagrams.
Figure 11: embodiment 2 circuit theory diagrams.
Figure 12: embodiment 3 circuit theory diagrams.
The technical solution of the utility model is to carry out multipole connection on the basis of second-order filter joint A. With high pass second order joint, high pass single order joint, low pass second order joint, the series connection of low pass single order joint, be combined into bandpass filter.
Embodiment 1:HLB 0.3/3.4D channel bandpass filter is made up of 0.3KHz three rank high pass filters and 3.4KHz six rank low pass filters, referring to the theory diagram of Fig. 4, and low pass second order joint L in sequential series
1, L
2, L
3High pass second order joint H
1, high pass single order joint H
2Constitute.Low pass second order joint L
1, L
2, L
3With high pass second order joint H
1Circuit is formed high pass H by basic second order joint A
2Be single order joint, circuit diagram such as Fig. 2, capacitor C
4Meet input Uin, capacitor C
4With resistance R
7Meet transport and placing device N
4In-phase input end, R
7Other end ground connection, C
4With R
7Form a passive high three-way filter, operational amplifier is connected into emitter follower, circuit theory diagrams as shown in figure 10, amplitude-frequency characteristic is as shown in Figure 7.Actual being up to the standard: passband fluctuation≤± .0.5dB, free transmission range is 270 to 3470Hz, during stopband characteristic f≤190Hz, when decay 20dB, f 〉=4470Hz, decay 55dB.
Embodiment 2: see Figure 11, the HLB0.3/12D band pass filter is made up of 0.3KHz five rank high pass filters and 12KHz five rank low pass filters, and Fig. 5 is its schematic block circuit diagram, by high pass second order joint H
3, H
4, high pass single order joint H
5, low pass second order joint L
4, L
5, low pass single order joint L
6In sequential series forming, low pass L
6Circuit is: capacitor C
5With resistance R
6Form passive low pass filtered node, again with transport and placing device N
5Inverting input be connected into emitter follower.
High pass H
3, H
4, low pass L
4, L
5Circuit as shown in Figure 1, high pass H
5Circuit theory is seen Fig. 2, low pass L
6Circuit diagram is seen Fig. 3, and amplitude-versus-frequency curve is seen Fig. 8.Actual being up to the standard: passband fluctuation≤± 0.5dB, free transmission range 290 is to 12500Hz, during stopband characteristic: f≤200Hz, decay 33dB; During f 〉=17000Hz, decay 30dB.
Embodiment 3:HLB 4.6/7.7D band pass filter is made up of 4.6KHz seven rank high pass filters and 7.7KHz nine rank low pass filters, schematic block circuit diagram shown in picture, amplitude-versus-frequency curve as shown in Figure 9, circuit theory is as shown in figure 12.
It is characterized in that: low pass second order joint L
7, L
8, L
9, L
10, low pass single order joint L
11High pass second order joint H
6, H
7, H
8, high pass single order joint H
9In sequential series.Low pass L
7, L
8, L
9, L
10With high pass H
6, H
7, H
8A is identical with elementary cell second order joint, low pass single order joint L
11Identical with Fig. 3, high pass single order joint H
9Identical with Fig. 2.Actual being up to the standard: passband fluctuation≤± 0.5dB, free transmission range: 4.6 to 7.7KHz; During stopband characteristic: f≤3400Hz, when decay 53dB, f 〉=8600Hz, decay 56dB.
Among the embodiment 1,2,3 in each circuit component parameters be listed in the table below:
Claims (3)
1, active filter comprises basic second-order filter joint A, second order joint A by first integral circuit, inverter, the second integral circuit is in sequential series constitutes; The first integral circuit comprises operational amplifier N
1, resistance R
1, capacitor C
1, inverter comprises operational amplifier N
2, resistance R
4, R
5The second integral circuit comprises: operational amplifier N
3, resistance R
3, R
5, capacitor C
2It is characterized in that:
(1) also has high pass single order joint H
2, comprising: capacitor C
4Meet input Uin, C
4With resistance R
7Meet transport and placing device N
4In-phase input end, R
7Other end ground connection, C
4With R
7Form a passive high three-way filter, operational amplifier is connected into emitter follower,
(2) low pass second order joint L
1, L
2, L
3, high pass second order joint H
1And single order joint H
2Composition band pass filter in sequential series.
2, according to the said active filter of claim 1, it is characterized by: high pass second order joint H
3, H
4, high pass single order joint H
5, low pass second order joint L
4, L
5, low pass single order joint L
6In sequential series, low pass L
6Circuit is: capacitor C
5With resistance R
8Form passive low pass filtered node, and with transport and placing device N
5Inverting input is connected into emitter follower.
3, active filter according to claim 2 is characterized by: low pass second order joint L
7, L
8, L
9, L
10, low pass single order joint L
11, high pass second order joint H
6, H
7, H
8, high pass single order joint H
9In sequential series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91230170 CN2105140U (en) | 1991-11-05 | 1991-11-05 | Active filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91230170 CN2105140U (en) | 1991-11-05 | 1991-11-05 | Active filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2105140U true CN2105140U (en) | 1992-05-20 |
Family
ID=4935533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91230170 Granted CN2105140U (en) | 1991-11-05 | 1991-11-05 | Active filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2105140U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064786A (en) * | 2009-11-16 | 2011-05-18 | 国基电子（上海）有限公司 | Band-pass filter |
| WO2019047134A1 (en) * | 2017-09-08 | 2019-03-14 | 中国科学院深圳先进技术研究院 | High-degree biological simulation-based voice processing filter and voice recognition device |
-
1991
- 1991-11-05 CN CN 91230170 patent/CN2105140U/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064786A (en) * | 2009-11-16 | 2011-05-18 | 国基电子（上海）有限公司 | Band-pass filter |
| WO2019047134A1 (en) * | 2017-09-08 | 2019-03-14 | 中国科学院深圳先进技术研究院 | High-degree biological simulation-based voice processing filter and voice recognition device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |