CN205017308U - DA converting circuit with filtering function - Google Patents
DA converting circuit with filtering function Download PDFInfo
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- CN205017308U CN205017308U CN201520625228.XU CN201520625228U CN205017308U CN 205017308 U CN205017308 U CN 205017308U CN 201520625228 U CN201520625228 U CN 201520625228U CN 205017308 U CN205017308 U CN 205017308U
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- 238000001914 filtration Methods 0.000 title abstract description 3
- 230000005693 optoelectronics Effects 0.000 abstract 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
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Abstract
The utility model discloses a DA converting circuit with filtering function, input including connecting at optoelectronic coupler is connected to the PWM output, optoelectronic coupler's output is through first ohmic connection to high level, optoelectronic coupler's output is through the second resistance of establishing ties and the third ohmic connection reverse input end put of first fortune extremely, through first capacity ground between second resistance and the third resistance, the positive going input end that first fortune was put is through fourth grounding, the output that reverse input end that first fortune was put to first fortune through the 5th parallelly connected resistance and the 2nd capacitance connection, the output that first fortune was put is through the 9th ohmic connection to analog signal output end, the reverse input end of putting to second fortune through the 3rd capacitance connection between second resistance and the third resistance, the positive going input end that second fortune was put is through the 6th grounding. The utility model discloses the not enough of prior art can be improved, noise reduction is effectively carried out to the analog signal who exports.
Description
Technical field
The utility model relates to DA switch technology field, especially a kind of DA change-over circuit with filter function.
Background technology
Counting in-Mo signaling conversion circuit, typically using photoelectrical coupler to realize number-mode convertion.But, undertaken counting by photoelectrical coupler-mode convertion time simultaneously can produce interference and signal drift in analog signal, the precision of analog signal is impacted.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of DA change-over circuit with filter function, can solve the deficiencies in the prior art, carries out noise reduction process effectively to the analog signal exported.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows.
A kind of DA change-over circuit with filter function, comprise the input being connected to photoelectrical coupler and be connected to PWM output, the output of photoelectrical coupler is connected to high level by the first resistance, the output of photoelectrical coupler is connected to the reverse input end of the first amplifier by the second resistance of series connection and the 3rd resistance, by the first capacity earth between second resistance and the 3rd resistance, the positive input of the first amplifier is by the 4th grounding through resistance, the reverse input end of the first amplifier is connected to the output of the first amplifier by the 5th resistance in parallel and the second electric capacity, the output of the first amplifier is connected to analog signal output by the 9th resistance, be connected to the reverse input end of the second amplifier by the 3rd electric capacity between second resistance and the 3rd resistance, the positive input of the second amplifier is by the 6th grounding through resistance, the reverse input end of the second amplifier is connected to the output of the second amplifier by the 7th resistance, the output of the second amplifier is connected to the reverse input end of the first amplifier by the 8th resistance.
The beneficial effect adopting technique scheme to bring is: the utility model is provided with the low-pass filter be made up of the first amplifier and peripheral circuit thereof at the output of photoelectrical coupler, carries out filtering process to the analog signal that photoelectrical coupler exports; Meanwhile, for the spike interference existed in analog signal, by the detection that the second amplifier is disturbed spike, testing result is fed back to the input of the first amplifier, its change for interference signal in analog signal can be made to carry out dynamic filter, thus improve the filter effect for analog signal.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model embodiment.
In figure: A1, the first amplifier; A2, the second amplifier; R1, the first resistance; R2, the second resistance; R3, the 3rd resistance; R4, the 4th resistance; R5, the 5th resistance; R6, the 6th resistance; R7, the 7th resistance; R8, the 8th resistance; R9, the 9th resistance; C1, the first electric capacity; C2, the second electric capacity; C3, the 3rd electric capacity; P, PWM output; G, photoelectrical coupler; VCC, high level; OUT, analog signal output.
Embodiment
With reference to Fig. 1, the utility model embodiment comprises the input being connected to photoelectrical coupler G and is connected to PWM output P, the output of photoelectrical coupler G is connected to high level VCC by the first resistance R1, the output of photoelectrical coupler G is connected to the reverse input end of the first amplifier A1 by the second resistance R2 of series connection and the 3rd resistance R3, by the first electric capacity C1 ground connection between second resistance R2 and the 3rd resistance R3, the positive input of the first amplifier A1 is by the 4th resistance R4 ground connection, the reverse input end of the first amplifier A1 is connected to the output of the first amplifier A1 by the 5th resistance R5 in parallel and the second electric capacity C2, the output of the first amplifier A1 is connected to analog signal output OUT by the 9th resistance R9, be connected to the reverse input end of the second amplifier A2 by the 3rd electric capacity C3 between second resistance R2 and the 3rd resistance R3, the positive input of the second amplifier A2 is by the 6th resistance R6 ground connection, the reverse input end of the second amplifier A2 is connected to the output of the second amplifier A2 by the 7th resistance R7, the output of the second amplifier A2 is connected to the reverse input end of the first amplifier A1 by the 8th resistance R8.
Wherein, the first resistance R1 is 150k Ω, and the second resistance R2 is 100k Ω, and the 3rd resistance R3 is 200k Ω, 4th resistance R4 is 70k Ω, and the 5th resistance R5 is 50k Ω, and the 6th resistance R6 is 90k Ω, 7th resistance R7 is 110k Ω, and the 8th resistance R8 is 150k Ω, and the 9th resistance R9 is 200k Ω.First electric capacity C1 is 270 μ F, and the second electric capacity C2 is 75 μ F, and the 3rd electric capacity C3 is 120 μ F, high level VCC is 24V.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (1)
1. one kind has the DA change-over circuit of filter function, comprise the PWM output (P) of the input being connected to photoelectrical coupler (G), it is characterized in that: the output of photoelectrical coupler (G) is connected to high level (VCC) by the first resistance (R1), the output of photoelectrical coupler (G) is connected to the reverse input end of the first amplifier (A1) by second resistance (R2) of series connection and the 3rd resistance (R3), by the first electric capacity (C1) ground connection between second resistance (R2) and the 3rd resistance (R3), the positive input of the first amplifier (A1) is by the 4th resistance (R4) ground connection, the reverse input end of the first amplifier (A1) is connected to the output of the first amplifier (A1) by the 5th resistance (R5) in parallel and the second electric capacity (C2), the output of the first amplifier (A1) is connected to analog signal output (OUT) by the 9th resistance (R9), be connected to the reverse input end of the second amplifier (A2) by the 3rd electric capacity (C3) between second resistance (R2) and the 3rd resistance (R3), the positive input of the second amplifier (A2) is by the 6th resistance (R6) ground connection, the reverse input end of the second amplifier (A2) is connected to the output of the second amplifier (A2) by the 7th resistance (R7), the output of the second amplifier (A2) is connected to the reverse input end of the first amplifier (A1) by the 8th resistance (R8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520625228.XU CN205017308U (en) | 2015-08-19 | 2015-08-19 | DA converting circuit with filtering function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520625228.XU CN205017308U (en) | 2015-08-19 | 2015-08-19 | DA converting circuit with filtering function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205017308U true CN205017308U (en) | 2016-02-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520625228.XU Expired - Fee Related CN205017308U (en) | 2015-08-19 | 2015-08-19 | DA converting circuit with filtering function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205017308U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105827247A (en) * | 2016-03-21 | 2016-08-03 | 成都天进仪器有限公司 | Small signal output circuit for intelligent relay protection tester |
-
2015
- 2015-08-19 CN CN201520625228.XU patent/CN205017308U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105827247A (en) * | 2016-03-21 | 2016-08-03 | 成都天进仪器有限公司 | Small signal output circuit for intelligent relay protection tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180919 Address after: 343000 No. 192 Torch Road, Jinggangshan economic and Technological Development Zone, Ji'an, Jiangxi Patentee after: JIANGXI CHUANGCHENG MICROELECTRONICS Co.,Ltd. Address before: 343100 192 East torch Avenue, Jinggangshan economic and Technological Development Zone, Ji'an, Jiangxi Patentee before: JIANGXI CHUANGCHENG ELECTRONIC Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160203 |