CN105024669A - Active low-pass filter circuit using 4580 operation amplifier - Google Patents
Active low-pass filter circuit using 4580 operation amplifier Download PDFInfo
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- CN105024669A CN105024669A CN201510499003.9A CN201510499003A CN105024669A CN 105024669 A CN105024669 A CN 105024669A CN 201510499003 A CN201510499003 A CN 201510499003A CN 105024669 A CN105024669 A CN 105024669A
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Abstract
The invention discloses an active low-pass filter circuit using a 4580 operation amplifier. The active low-pass filter circuit comprises an operation amplifier circuit employing a 4580 operation amplifier chip and a pi type filtering circuit; and the operation amplifier circuit is connected with the pi type filtering circuit. The pi type filtering circuit is a pi type RC low-pass filter circuit formed by a capacitor C2, a capacitor C3 and a resistor R3; and an output terminal of the pi type RC low-pass filter circuit is connected with the operation amplifier circuit. According to the active low-pass filter circuit based on the 4580 operation amplifier chip, a needed low-frequency signal can be amplified and a needless high-frequency signal can be intercepted, so that a subsequent processing circuit can have a proper frequency signal to carry out processing.
Description
Technical field
The present invention relates to electronic circuit technology field, specifically, is the active low-pass filter circuit of a kind of employing 4580 amplifiers.
Background technology
Low pass filter allows to pass through lower than the signal of cut-off frequency, but higher than the intransitable electronic filtering device of signal of cut-off frequency.
Active low-pass filter:
Filter a kind ofly useful frequency signal can be made to pass through and suppress the electronic installation of unwanted frequency signal simultaneously, is usually used in the aspects such as signal transacting, transfer of data and AF panel, and active low-pass filter circuit is made up of integrated transporting discharging and passive component resistance and electric capacity.Its function be allow from zero to the signal of certain cut-off frequency undamped pass through, and have inhibitory action to the signal of other frequencies.Active low-pass filter circuit can be used for filtering high-frequency interferencing signal.
The effect of filter circuit is exactly allow the signal within the scope of certain band frequency to pass through, and stops or weaken the signal of other frequency ranges.Active filter circuit is made up of resistance, electric capacity and integrated operational amplifier, is also called active filter.Active filter can also play amplification to signal while filtering, and this is that passive filtering cannot be accomplished.Pass through according to filter circuit or stop signal frequency range different, filter circuit can be divided into low pass, high pass, band to lead to and band resistance circuit.
Amplifier, the abbreviation of operational amplifier is current most widely used a kind of device, although each middle different amplifier structure is different, for external circuit, its characteristic is all the same.Operational amplifier is generally made up of 4 parts, biasing circuit, input stage, intergrade, output stage, wherein input stage is generally adopt differential amplifier circuit (suppression power supply), and intergrade generally adopts the cascode load circuit (raising multiplication factor) of active load, and output stage generally adopts mutual symmetry output-stage circuit (improving the ability of drives load).
The performance index of operational amplifier comprise 5, open loop differential voltage amplification, maximum output voltage, difference-mode input resistance, output resistance, common-mode rejection ratio CMRR.(open loop differential mode multiplication factor refers to that integrated transporting discharging is in the multiplication factor without differential mode voltage when additional feedback loop.Under maximum output voltage refers to that it refers to certain voltage, the peak of the maximum nondistortion output voltage of integrated transporting discharging--peak value.The size of difference-mode input resistance reflects integrated transporting discharging input asks for size from electric current to differential input signal source.Require that it is larger better.The size of output resistance reflects the load capacity of integrated transporting discharging when small-signal exports.Common-mode rejection ratio has shown the rejection ability of integrated transporting discharging to common mode input signal, and it defines same differential amplifier circuit.CMRR is the bigger the better).
Summary of the invention
The object of the present invention is to provide the active low-pass filter circuit of a kind of employing 4580 amplifiers, utilize a active low-pass filter circuit that 4580 amplifier chips are built, the low-frequency signals of needs can be passed through and carry out signal amplification, unwanted high-frequency signal is retained simultaneously, make subsequent process circuit that a suitable frequency signal can be had to process.
The present invention is achieved through the following technical solutions: the active low-pass filter circuit of a kind of employing 4580 amplifiers, comprises discharge circuit and the π type filter circuit of employing 4580 amplifier chip, and described discharge circuit connects π type filter circuit.
Further to better implement the present invention, described π type filter circuit is the π type RC low-pass filter circuit that electric capacity C2, electric capacity C3 and resistance R3 are formed, and the output of π type RC low pass filter is connected with discharge circuit.
Further to better implement the present invention, described electric capacity C2 adopts 102pf ceramic disc capacitor, and described electric capacity C3 adopts 122pf ceramic disc capacitor, and described resistance R3 adopts 4.7K Ω resistance.
Further to better implement the present invention, be also connected with resistance R4 at the input of described π type RC low pass filter, described resistance R4 adopts 5.8K Ω resistance.
Further to better implement the present invention, described discharge circuit comprises 4580 amplifier chip IC 1, resistance R1, resistance R2, electric capacity C1, between the output that described electric capacity C1 is connected to 4580 amplifier chip IC 1 and inverting input; Described resistance R1 connects the output of π type filter circuit and the output of 4580 amplifier chip IC 1, the output of described π type filter circuit is connected with the inverting input of 4580 amplifier chip IC 1 by resistance R2, the in-phase input end ground connection of described 4580 amplifier chip IC 1.
Further to better implement the present invention, described 4580 amplifier chip IC 1 adopt RC4580 amplifier chip, and described electric capacity C1 adopts 101pf ceramic disc capacitor, and described resistance R1 adopts 20K Ω resistance, and described resistance R2 adopts 4.7K Ω resistance.
Further to better implement the present invention, described 4580 amplifier chip IC 1 adopt ± 9v Power supply.
The present invention compared with prior art, has the following advantages and beneficial effect:
A active low-pass filter circuit that the present invention utilizes 4580 amplifier chips to build, the low-frequency signals of needs can be passed through and carry out signal amplification, unwanted high-frequency signal is retained simultaneously, make subsequent process circuit that a suitable frequency signal can be had to process.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1:
The active low-pass filter circuit of a kind of employing 4580 amplifiers, utilize a active low-pass filter circuit that 4580 amplifier chips are built, the low-frequency signals of needs can be passed through and carry out signal amplification, unwanted high-frequency signal is retained simultaneously, make subsequent process circuit that a suitable frequency signal can be had to process, be provided with following structure especially: the discharge circuit and the π type filter circuit that comprise employing 4580 amplifier chip, described discharge circuit connects π type filter circuit.
Embodiment 2:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, described π type filter circuit is the π type RC low-pass filter circuit that electric capacity C2, electric capacity C3 and resistance R3 are formed, and the output of π type RC low pass filter is connected with discharge circuit.
Embodiment 3:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, described electric capacity C2 adopts 102pf ceramic disc capacitor, described electric capacity C3 adopts 122pf ceramic disc capacitor, and described resistance R3 adopts 4.7K Ω resistance.
Embodiment 4:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, is also connected with resistance R4 at the input of described π type RC low pass filter, and described resistance R4 adopts 5.8K Ω resistance.
Embodiment 5:
The present embodiment is at the enterprising one-step optimization in the basis of above-mentioned any embodiment, further to better implement the present invention, as shown in Figure 1, described discharge circuit comprises 4580 amplifier chip IC 1, resistance R1, resistance R2, electric capacity C1, between the output that described electric capacity C1 is connected to 4580 amplifier chip IC 1 and inverting input; Described resistance R1 connects the output of π type filter circuit and the output of 4580 amplifier chip IC 1, the output of described π type filter circuit is connected with the inverting input of 4580 amplifier chip IC 1 by resistance R2, the in-phase input end ground connection of described 4580 amplifier chip IC 1.
Embodiment 6:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, described 4580 amplifier chip IC 1 adopt RC4580 amplifier chip, described electric capacity C1 adopts 101pf ceramic disc capacitor, described resistance R1 adopts 20K Ω resistance, and described resistance R2 adopts 4.7K Ω resistance.
Embodiment 7:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, and further to better implement the present invention, as shown in Figure 1, described 4580 amplifier chip IC 1 adopt ± 9v Power supply.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.
Claims (7)
1. adopt an active low-pass filter circuit for 4580 amplifiers, it is characterized in that: the discharge circuit and the π type filter circuit that comprise employing 4580 amplifier chip, described discharge circuit connects π type filter circuit.
2. the active low-pass filter circuit of a kind of employing according to claim 1 4580 amplifiers, it is characterized in that: described π type filter circuit is the π type RC low-pass filter circuit that electric capacity C2, electric capacity C3 and resistance R3 are formed, and the output of π type RC low pass filter is connected with discharge circuit.
3. the active low-pass filter circuit of a kind of employing according to claim 2 4580 amplifiers, it is characterized in that: described electric capacity C2 adopts 102pf ceramic disc capacitor, described electric capacity C3 adopts 122pf ceramic disc capacitor, and described resistance R3 adopts 4.7K Ω resistance.
4. the active low-pass filter circuit of a kind of employing 4580 amplifiers according to Claims 2 or 3, is characterized in that: be also connected with resistance R4 at the input of described π type RC low pass filter, described resistance R4 adopts 5.8K Ω resistance.
5. the active low-pass filter circuit of a kind of employing according to claim 1 4580 amplifiers, it is characterized in that: described discharge circuit comprises 4580 amplifier chip IC 1, resistance R1, resistance R2, electric capacity C1, between the output that described electric capacity C1 is connected to 4580 amplifier chip IC 1 and inverting input; Described resistance R1 connects the output of π type filter circuit and the output of 4580 amplifier chip IC 1, the output of described π type filter circuit is connected with the inverting input of 4580 amplifier chip IC 1 by resistance R2, the in-phase input end ground connection of described 4580 amplifier chip IC 1.
6. the active low-pass filter circuit of a kind of employing according to claim 5 4580 amplifiers, it is characterized in that: described 4580 amplifier chip IC 1 adopt RC4580 amplifier chip, described electric capacity C1 adopts 101pf ceramic disc capacitor, described resistance R1 adopts 20K Ω resistance, and described resistance R2 adopts 4.7K Ω resistance.
7. the active low-pass filter circuit of a kind of employing 4580 amplifiers according to claim 5 or 6, is characterized in that: described 4580 amplifier chip IC 1 adopt ± 9v Power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510499003.9A CN105024669A (en) | 2015-08-14 | 2015-08-14 | Active low-pass filter circuit using 4580 operation amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510499003.9A CN105024669A (en) | 2015-08-14 | 2015-08-14 | Active low-pass filter circuit using 4580 operation amplifier |
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| CN105024669A true CN105024669A (en) | 2015-11-04 |
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| CN201510499003.9A Pending CN105024669A (en) | 2015-08-14 | 2015-08-14 | Active low-pass filter circuit using 4580 operation amplifier |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1282744A (en) * | 1968-12-11 | 1972-07-26 | Burroughs Corp | Improvements in or relating to data sets employing active filters |
| CN1553588A (en) * | 2003-06-05 | 2004-12-08 | 中兴通讯股份有限公司 | Self-adaptation balancing apparatus for SDH transmission system circuit attenuation compensation |
| CN2747818Y (en) * | 2004-11-26 | 2005-12-21 | 林万炯 | Adjustable highting ballast circuit having strip lamp resistance feedback net |
| CN101977060A (en) * | 2010-11-12 | 2011-02-16 | 中国兵器工业集团第二一四研究所苏州研发中心 | Coordinate decoding module |
| CN203369903U (en) * | 2013-07-30 | 2014-01-01 | 上海理工大学 | Small premature beat detection device |
| CN204859132U (en) * | 2015-08-14 | 2015-12-09 | 成都易思科科技有限公司 | Adopt 4580 to transport active low -pass filter circuit of putting |
-
2015
- 2015-08-14 CN CN201510499003.9A patent/CN105024669A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1282744A (en) * | 1968-12-11 | 1972-07-26 | Burroughs Corp | Improvements in or relating to data sets employing active filters |
| CN1553588A (en) * | 2003-06-05 | 2004-12-08 | 中兴通讯股份有限公司 | Self-adaptation balancing apparatus for SDH transmission system circuit attenuation compensation |
| CN2747818Y (en) * | 2004-11-26 | 2005-12-21 | 林万炯 | Adjustable highting ballast circuit having strip lamp resistance feedback net |
| CN101977060A (en) * | 2010-11-12 | 2011-02-16 | 中国兵器工业集团第二一四研究所苏州研发中心 | Coordinate decoding module |
| CN203369903U (en) * | 2013-07-30 | 2014-01-01 | 上海理工大学 | Small premature beat detection device |
| CN204859132U (en) * | 2015-08-14 | 2015-12-09 | 成都易思科科技有限公司 | Adopt 4580 to transport active low -pass filter circuit of putting |
Non-Patent Citations (2)
| Title |
|---|
| 德州仪器: "RC4580 Dual Audio Operational Amplifier", 《HTTP://WWW.TI.COM.CN/PRODUCT/CN/RC4580/TECHNICALDOCUMENTS》 * |
| 王茂等: "《现代数字控制实践》", 31 March 2011, 哈尔滨工业大学出版社 * |
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