CN201878104U - Filter - Google Patents
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- CN201878104U CN201878104U CN2010206544092U CN201020654409U CN201878104U CN 201878104 U CN201878104 U CN 201878104U CN 2010206544092 U CN2010206544092 U CN 2010206544092U CN 201020654409 U CN201020654409 U CN 201020654409U CN 201878104 U CN201878104 U CN 201878104U
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- resistance
- operational amplifier
- filter
- electric capacity
- capacitor
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Abstract
The utility model relates a filter, which comprises an operational amplifier and a filter circuit, wherein the filter circuit comprises a first resistance, a second resistance, a first capacitor and a second capacitor, and the values of the first resistance and the second resistance are equal; one end of the first resistance is connected with an input end of signals, and the other end of the first resistance is connected with the second resistance; the second resistance is connected with a positive input end of the operational amplifier, and one end of the first capacitor is connected between the first resistance and the second resistance; the other end of the first capacitor is connected with a negative input end of the operational amplifier, and the negative input end of the operational amplifier is connected with an output end; and one end of the second capacitor is connected between the second resistance and the positive input end of the operational amplifier, and the other end of the second capacitor is grounded.
Description
Technical field
The utility model relates to a kind of signal processor, particularly a kind of filter of positive feedback type.
Background technology
Filter is mainly used in the electrical communication system, as a kind of signal processor, eliminates interference signal, realizes the high-quality transmission of signal, is indispensable device in the electronic communication system.Existing filter element number is more, complex structure.
Summary of the invention
The purpose of this utility model is to provide a kind of filter at the problem of the existing filter existence described in the background technology.
The realization the technical solution of the utility model is as follows:
A kind of filter, it comprises operational amplifier and filter circuit, described filter circuit comprises first resistance, second resistance, first electric capacity and second electric capacity, the resistance value of described first resistance and second resistance equates, one end of first resistance connects the input of signal, the other end connects second resistance, second resistance is connected in the positive input of operational amplifier, first electric capacity, one end is connected between first resistance and second resistance, the other end is connected in the negative input of operational amplifier, the negative input of operational amplifier is connected with output, second electric capacity, one end is connected between the positive input of second resistance and operational amplifier, the other end ground connection of second electric capacity.
The beneficial effects of the utility model are because the resistance value of first resistance of the present utility model and second resistance equates, the gain of filter is 1, therefore, filter can be realized 2 rank filtering with less elements quantity, filter construction of the present utility model is simple, filtering performance is good, can be widely used in the manufacturing and designing of low pass filter.
Description of drawings
Fig. 1 is a schematic diagram of the present utility model;
Among the figure, 1 is operational amplifier, and 2 is first resistance, and 3 is second resistance, and 4 is first electric capacity, and 5 is second electric capacity.
Embodiment
With reference to a kind of filter shown in Figure 1, it comprises operational amplifier 1 and filter circuit, described filter circuit comprises first resistance 2, second resistance 3, first electric capacity 4 and second electric capacity 5, the resistance value of described first resistance 2 and second resistance 3 equates, one end of first resistance 2 connects the input of signal, the other end connects second resistance 3, second resistance 3 is connected in the positive input of operational amplifier 1, first electric capacity, 4 one ends are connected between first resistance 2 and second resistance 3, the other end is connected in the negative input of operational amplifier 1, the negative input of operational amplifier 1 is connected with output, second electric capacity, 5 one ends are connected between the positive input of second resistance 3 and operational amplifier 1, the other end ground connection of second electric capacity 5.Because the resistance value of first resistance 2 of the present utility model and second resistance 3 equates, the gain of filter is 1, therefore, filter can be realized 2 rank filtering with less elements quantity, filter construction of the present utility model is simple, filtering performance is good, can be widely used in the manufacturing and designing of low pass filter.
Claims (1)
1. filter, it is characterized in that: it comprises operational amplifier and filter circuit, described filter circuit comprises first resistance, second resistance, first electric capacity and second electric capacity, the resistance value of described first resistance and second resistance equates, one end of first resistance connects the input of signal, the other end connects second resistance, second resistance is connected in the positive input of operational amplifier, first electric capacity, one end is connected between first resistance and second resistance, the other end is connected in the negative input of operational amplifier, the negative input of operational amplifier is connected with output, second electric capacity, one end is connected between the positive input of second resistance and operational amplifier, the other end ground connection of second electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206544092U CN201878104U (en) | 2010-12-13 | 2010-12-13 | Filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206544092U CN201878104U (en) | 2010-12-13 | 2010-12-13 | Filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201878104U true CN201878104U (en) | 2011-06-22 |
Family
ID=44166012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206544092U Expired - Fee Related CN201878104U (en) | 2010-12-13 | 2010-12-13 | Filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201878104U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123374A (en) * | 2011-11-18 | 2013-05-29 | 四川蓝讯宝迩电子科技有限公司 | Detection circuit for low-pass RC (resistor-capacitor) active filter |
| CN106921364A (en) * | 2017-03-10 | 2017-07-04 | 成都金广通科技有限公司 | The filter of mobile data acquisition device |
| CN108226169A (en) * | 2018-01-16 | 2018-06-29 | 上海熙视光电科技有限公司 | A kind of intelligent online vision detection system of injection |
| CN108663372A (en) * | 2018-05-08 | 2018-10-16 | 无锡九霄科技有限公司 | A kind of endoscopic cavity parts appearance detecting method based on line-scan digital camera |
-
2010
- 2010-12-13 CN CN2010206544092U patent/CN201878104U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123374A (en) * | 2011-11-18 | 2013-05-29 | 四川蓝讯宝迩电子科技有限公司 | Detection circuit for low-pass RC (resistor-capacitor) active filter |
| CN106921364A (en) * | 2017-03-10 | 2017-07-04 | 成都金广通科技有限公司 | The filter of mobile data acquisition device |
| CN108226169A (en) * | 2018-01-16 | 2018-06-29 | 上海熙视光电科技有限公司 | A kind of intelligent online vision detection system of injection |
| CN108663372A (en) * | 2018-05-08 | 2018-10-16 | 无锡九霄科技有限公司 | A kind of endoscopic cavity parts appearance detecting method based on line-scan digital camera |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20111213 |