CN103684325A - Filter circuit efficient in filtering - Google Patents
Filter circuit efficient in filtering Download PDFInfo
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- CN103684325A CN103684325A CN201310615454.5A CN201310615454A CN103684325A CN 103684325 A CN103684325 A CN 103684325A CN 201310615454 A CN201310615454 A CN 201310615454A CN 103684325 A CN103684325 A CN 103684325A
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Abstract
The invention discloses a filter circuit efficient in filtering. The filter circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor C3, an operation amplifier A, an alternating-current power supply Vi and a direct-current power supply V0. The non-inverting input ends of the alternating-current power supply Vi, the resistor R1, the resistor R2, the resistor R3 and the operation amplifier A are sequentially serially connected. One end of the capacitor C1 is connected to the common terminal of the resistor R2 and the resistor R3, and the other end thereof is connected with the output end of the operation amplifier A. One end of the capacitor C2 is connected with the common terminal of the resistor R3 and the operation amplifier A, and the other end thereof is connected with the capacitor C3. The capacitor C3 is further connected with the common terminal of the resistor R1 and the resistor R2. One end of the resistor R5 is connected with the common terminal of the alternating-current power supply Vi and the resistor R1. The resistor R5, the capacitor C2 and the capacitor C3 are all grounded. The resistor 4 is connected between an inverting input end of the operation amplifier A and the output end of the operation amplifier A. The output end of the operation amplifier A is further connected with the direct-current power supply V0. By the arrangement, twice filtering can be achieved, signal transmission is accurate, resonance phenomena can be avoided, and microwave communication quality can be increased.
Description
Technical field
The present invention relates to filter field, be specifically related to the filter circuit of efficient filtering.
Background technology
Filter (filter) refers to and reduces or eliminates the electric component of harmonic wave to effect on power system.Filter is a kind of device that is used for eliminating jamming incoherent signal, by inputing or outputing through filtration, obtains pure direct current.The circuit that frequency beyond the frequency of characteristic frequency or this frequency is carried out to effective filtering, is exactly filter, and its function obtains exactly a characteristic frequency or eliminates a characteristic frequency.In microwave communication field, often need to filter the electromagnetic wave of transmission, retain the electromagnetic wave of wavelength between 0.1 millimeter to 1 meter, in this process, also need to use filter circuit.Existing filter circuit characteristic is affected greatly by system parameters, can only eliminate specific a few subharmonic, and can produce amplification to some subharmonic, even can produce resonance phenomena, is not conducive to microwave communication.In addition, also have filter circuit can not produce resonance phenomena, but integrated transporting discharging broadband is limited, what cause that operating frequency on filter circuit is difficult to do is very high.And microwave communication because its bandwidth, capacity are large, can constantly be widely used for the transmission of various telecommunication services, all there is very large defect in existing filter circuit, is unfavorable for the development of microwave communication.
Summary of the invention
The present invention has overcome the deficiencies in the prior art, and the filter circuit of efficient filtering is provided, and microwave signal is first by passive filter filtering, and then by active power filtering, realize twice filtering, signal transmission is more accurate, also can not produce resonance phenomena, improve the quality of microwave communication.
For solving above-mentioned technical problem, the present invention is by the following technical solutions: the filter circuit of efficient filtering, comprise resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, capacitor C 1, capacitor C 2, capacitor C 3, operational amplifier A, AC power Vi and DC power supply V0, the input in the same way of described AC power Vi, resistance R 1, resistance R 2, resistance R 3 and operational amplifier A is connected in series successively; Described capacitor C 1 one end contact resistance R2 and the common port of resistance R 3, the output of other end concatenation operation amplifier A; Described capacitor C 2 one end contact resistance R3 and the common port of operational amplifier A, the other end connects capacitor C 3; Described capacitor C 3 is gone back the common port of contact resistance R1 and resistance R 2; Described resistance R 5 one end connect the common port of AC power Vi and resistance R 1, resistance R 5, capacitor C 2 and the equal ground connection of capacitor C 3; Described resistance R 4 is connected between the reverse input end of operational amplifier A and the output of operational amplifier A, and the output of operational amplifier A also connects DC power supply V0.R1 and C3 form passive filtering, and R2, R3, C1, C2 and operational amplifier form active power filtering, thereby realize twice filtering, and in microwave communication field, filter effect is better, disturbed by other signal little, and signal transmission is more accurate.
Described resistance R 2 and the resistance of resistance R 3 are equal, and Standard resistance range is between 95 kilo-ohms-105 kilo-ohms.
The resistance of described resistance R 4 is greater than the resistance of resistance R 1, and the resistance of resistance R 4 is less than the resistance of resistance R 2.
The resistance of described resistance R 2 is 10 times of resistance R 1 resistance.
In described capacitor C 1, capacitor C 2 and capacitor C 3, capacitor C 3 capacity are minimum, and capacitor C 1 capacity is maximum.
The size of described capacitor C 3 is 0.01 microfarad.Achieve preferably passive filtering effect.
Compared with prior art, the invention has the beneficial effects as follows: the present invention arranges active power filtering at front end, then passive filtering is set again, signal in microwave communication has been carried out to double-smoothing, reach unwanted signal of communication in good filtering microwave communication, make the signal transmission that finally receives more accurate, also can not produce resonance phenomena.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated, and embodiments of the invention are not limited to this.
Embodiment:
As shown in Figure 1, the present invention includes resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, capacitor C 1, capacitor C 2, capacitor C 3, operational amplifier A, AC power Vi and DC power supply V0, the input in the same way of described AC power Vi, resistance R 1, resistance R 2, resistance R 3 and operational amplifier A is connected in series successively.Capacitor C 1 one end contact resistance R2 of the present embodiment and the common port of resistance R 3, the output of other end concatenation operation amplifier A; The common port of capacitor C 2 one end contact resistance R3 and operational amplifier A, the other end connects capacitor C 3; Capacitor C 3 is gone back the common port of contact resistance R1 and resistance R 2.In capacitor C 1, capacitor C 2 and capacitor C 3, capacitor C 3 capacity are minimum, and capacitor C 1 capacity is maximum, and the size of capacitor C 3 is 0.01 microfarad.Resistance R 5 one end of the present embodiment connect the common port of AC power Vi and resistance R 1, resistance R 5, capacitor C 2 and the equal ground connection of capacitor C 3; Described resistance R 4 is connected between the reverse input end of operational amplifier A and the output of operational amplifier A, and the output of operational amplifier A also connects DC power supply V0.The resistance R 2 of the present embodiment and the resistance of resistance R 3 are equal, and Standard resistance range is between 95 kilo-ohms-105 kilo-ohms, and the resistance of resistance R 4 is greater than the resistance of resistance R 1, and the resistance of resistance R 4 is less than the resistance of resistance R 2, and the resistance of resistance R 2 is 10 times of resistance R 1 resistance.
R1 and C3 form passive filtering, R2, R3, C1, C2 and operational amplifier form active power filtering, thereby realize twice filtering, reach unwanted signal of communication in good filtering microwave communication, make the signal transmission that finally receives more accurate, also can not produce resonance phenomena.
Just can realize this invention as mentioned above.
Claims (6)
1. the filter circuit of efficient filtering, it is characterized in that: comprise resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, capacitor C 1, capacitor C 2, capacitor C 3, operational amplifier A, AC power Vi and DC power supply V0, the input in the same way of described AC power Vi, resistance R 1, resistance R 2, resistance R 3 and operational amplifier A is connected in series successively; Described capacitor C 1 one end contact resistance R2 and the common port of resistance R 3, the output of other end concatenation operation amplifier A; Described capacitor C 2 one end contact resistance R3 and the common port of operational amplifier A, the other end connects capacitor C 3; Described capacitor C 3 is gone back the common port of contact resistance R1 and resistance R 2; Described resistance R 5 one end connect the common port of AC power Vi and resistance R 1, resistance R 5, capacitor C 2 and the equal ground connection of capacitor C 3; Described resistance R 4 is connected between the reverse input end of operational amplifier A and the output of operational amplifier A, and the output of operational amplifier A also connects DC power supply V0.
2. the filter circuit of efficient filtering according to claim 1, is characterized in that: described resistance R 2 and the resistance of resistance R 3 are equal, and Standard resistance range is between 95 kilo-ohms-105 kilo-ohms.
3. the filter circuit of efficient filtering according to claim 2, is characterized in that: the resistance of described resistance R 4 is greater than the resistance of resistance R 1, and the resistance of resistance R 4 is less than the resistance of resistance R 2.
4. according to the filter circuit of the efficient filtering described in claim 2 or 3, it is characterized in that: the resistance of described resistance R 2 is 10 times of resistance R 1 resistance.
5. the filter circuit of efficient filtering according to claim 1, is characterized in that: in described capacitor C 1, capacitor C 2 and capacitor C 3, capacitor C 3 capacity are minimum, and capacitor C 1 capacity is maximum.
6. the filter circuit of efficient filtering according to claim 1, is characterized in that: the size of described capacitor C 3 is 0.01 microfarad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310615454.5A CN103684325A (en) | 2013-11-28 | 2013-11-28 | Filter circuit efficient in filtering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310615454.5A CN103684325A (en) | 2013-11-28 | 2013-11-28 | Filter circuit efficient in filtering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103684325A true CN103684325A (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310615454.5A Pending CN103684325A (en) | 2013-11-28 | 2013-11-28 | Filter circuit efficient in filtering |
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| CN (1) | CN103684325A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100607A (en) * | 2016-08-04 | 2016-11-09 | 三河市汇莹电气设备制造有限公司 | A kind of passive filter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202634379U (en) * | 2012-07-03 | 2012-12-26 | 四川蓝讯宝迩电子科技有限公司 | Direct-current coupling low-pass RC (remote control) active filter |
| CN102983837A (en) * | 2012-11-21 | 2013-03-20 | 昆山北极光电子科技有限公司 | Bootstrap high-pass filtering circuit |
| CN103368524A (en) * | 2013-06-17 | 2013-10-23 | 成都荣耀科技有限公司 | Signal conditioning circuit for remote monitoring system of distribution transformer |
-
2013
- 2013-11-28 CN CN201310615454.5A patent/CN103684325A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202634379U (en) * | 2012-07-03 | 2012-12-26 | 四川蓝讯宝迩电子科技有限公司 | Direct-current coupling low-pass RC (remote control) active filter |
| CN102983837A (en) * | 2012-11-21 | 2013-03-20 | 昆山北极光电子科技有限公司 | Bootstrap high-pass filtering circuit |
| CN103368524A (en) * | 2013-06-17 | 2013-10-23 | 成都荣耀科技有限公司 | Signal conditioning circuit for remote monitoring system of distribution transformer |
Non-Patent Citations (1)
| Title |
|---|
| 门宏: "《识读无线电电路图快速入门》", 31 August 2004, article ""第七节 有源滤波器"" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100607A (en) * | 2016-08-04 | 2016-11-09 | 三河市汇莹电气设备制造有限公司 | A kind of passive filter |
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Application publication date: 20140326 |