CN201878101U - Filter - Google Patents
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- CN201878101U CN201878101U CN2010206544069U CN201020654406U CN201878101U CN 201878101 U CN201878101 U CN 201878101U CN 2010206544069 U CN2010206544069 U CN 2010206544069U CN 201020654406 U CN201020654406 U CN 201020654406U CN 201878101 U CN201878101 U CN 201878101U
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- resistance
- operational amplifier
- electric capacity
- resistor
- filter
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Abstract
The utility model relates to a filter which comprises an operational amplifier and a filter circuit, and also comprises a buffer that comprises a buffering resistor and a buffering capacitor which are respectively connected between the negative input end and the output end of the operational amplifier in parallel; the filter circuit comprises a first resistor, a second resistor, a first capacitor and a second capacitor; the resistance of the first resistor and the second resistor are identical; one end of the first resistor is connected with the input end of a signal, and the other end of the first resistor is connected with the second resistor which is connected with the positive input end of the operational amplifier; one end of the first capacitor is connected between the first resistor and the second resistor, and the other end of the first capacitor is connected with the negative input end of the operational amplifier; the negative input end of the operational amplifier is connected with the output end of the operational amplifier; and one end of the second capacitor is connected between the second resistor and the positive input end of the operational amplifier, and the other end of the capacitor is connected with the ground.
Description
Technical field
The utility model relates to a kind of Signal Processing Element, particularly a kind of low pass filter with positive feedback type of buffer.
Background technology
Filter almost is the part of all electric equipment products indispensabilities, mainly is to come the influence of harmonic carcellation to communication system or electric power system by filter, and useful signal is zero-decrement as far as possible by filter, the decay then big as far as possible to unwanted signal.The general complex structure of existing filter is made up of more element, and antishock poor-performing.
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 technology of Beijing.
The realization the technical solution of the utility model is as follows:
A kind of filter, it comprises operational amplifier and filter circuit, also comprise buffer, it comprises buffer resistance and buffering electric capacity, buffer resistance and buffering electric capacity all are parallel to the negative input of operational amplifier between output, 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.
Therefore the beneficial effects of the utility model can prevent the concussion in the filtering for because the negative input of the operational amplifier of filter of the present utility model is parallel with buffer resistance and buffering electric capacity between output, improve the quality of filtering.
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, and 6 is buffer resistance, and 7 is buffer capacitor.
Embodiment
With reference to a kind of filter shown in Figure 1, it comprises operational amplifier 1 and filter circuit, also comprise buffer, it comprises buffer resistance 6 and buffering electric capacity 7, buffer resistance 6 and buffering electric capacity 7 all are parallel to the negative input of operational amplifier 1 between output, 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 negative input of the operational amplifier of filter of the present utility model 1 is parallel with buffer resistance 6 and buffering electric capacity 7 between output, therefore can prevent the concussion in the filtering, improve the quality of filtering.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 comprises operational amplifier and filter circuit, it is characterized in that: also comprise buffer, it comprises buffer resistance and buffering electric capacity, buffer resistance and buffering electric capacity all are parallel to the negative input of operational amplifier between output, 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 |
|---|---|---|---|
| CN2010206544069U CN201878101U (en) | 2010-12-13 | 2010-12-13 | Filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206544069U CN201878101U (en) | 2010-12-13 | 2010-12-13 | Filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201878101U true CN201878101U (en) | 2011-06-22 |
Family
ID=44166009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206544069U Expired - Fee Related CN201878101U (en) | 2010-12-13 | 2010-12-13 | Filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201878101U (en) |
Cited By (1)
| 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 |
-
2010
- 2010-12-13 CN CN2010206544069U patent/CN201878101U/en not_active Expired - Fee Related
Cited By (1)
| 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 |
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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 |