CN203675061U - Double-T network adjustable wave trap - Google Patents
Double-T network adjustable wave trap Download PDFInfo
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- CN203675061U CN203675061U CN201320841350.1U CN201320841350U CN203675061U CN 203675061 U CN203675061 U CN 203675061U CN 201320841350 U CN201320841350 U CN 201320841350U CN 203675061 U CN203675061 U CN 203675061U
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Abstract
The utility model relates to a double-T network adjustable wave trap, which is characterized in that a wave trap circuit is composed of an amplifier with the gain being 1, an RC double-T network and an RC single-T network for determining a Q value of a circuit, the amplifier adopts an integrated circuit MC14399, the RC double-T network is composed of an adjustable resistor R1, a resistor R2, an adjustable resistor R3, a capacitor C1, a capacitor C2 and a capacitor C3, the RC single-T network is composed of a resistor R5, a resistor R6 and a capacitor C4, and a pin 2 of the integrated circuit MC14399 is connected to a pin 6 through a resistor R4; the output end of the double-T network is connected to a pin 3 of the integrated circuit MC14399; values of the resistor R1, the resistor R2 and the resistor R3 in the RC double-T network are 1R, 2R and 2R respectively; and values of the capacitor C 1, the capacitor C2 and the capacitor C3 are 2C, 1C and 1C respectively. The beneficial effects are that a multi-frequency high-precision low-frequency wave trap is formed through the circuit design and has the characteristics of excellent frequency-selection, convenient adjustment and stable frequency, and low-frequency disturbing influences imposed on the surrounding environment by communication equipment are ensured to be reduced to be lowest through a double-T network adjustable circuit.
Description
Technical field
The utility model relates to the equipment of radio communication, moving communicating field, particularly a kind of twin-T network adjustable notch filter device.
Background technology
In radio communication and moving communicating field, often need to ensure lower sensitivity index requirement, can receive very little signal.But in surrounding environment, often exist complex environment to disturb, wherein the interference of some low frequency is particularly serious.These disturb conventionally and arrive hundreds of hertz at tens hertz, are mainly that main equipment operation or the AC power in surrounding environment disturbed generation.
On the transmission channel of communication equipment, add notch filter circuit, can ensure to the full extent that communication equipment is reduced to minimum on the low-frequency disturbance impact in surrounding environment.But in actual environment because low-frequency disturbance cannot be determined, so single notch filter circuit cannot meet the demands, so adjustable notch filter device scheme just seems particularly important.
At present, the domestic bibliographical information that not yet has a kind of adjustable notch filter device.How to address this problem and just become the problem that those skilled in the art will study and solve.
Summary of the invention
Object of the present invention is exactly for overcoming the deficiencies in the prior art, a kind of design of twin-T network adjustable notch filter device circuit is provided, form multifrequency point high precision low frequency trapper by circuit design, trapper adopts twin-T network conditioned circuit to realize, and ensures that by twin-T network conditioned circuit communication equipment is reduced to minimum on the low-frequency disturbance impact in surrounding environment.
The present invention realizes by such technical scheme: a kind of twin-T network adjustable notch filter device, it is characterized in that, and the mono-T network of RC of amplifier, RC twin-T network and decision-making circuit Q value that notch filter circuit is is 1 by gain connects to form,
Amplifier adopts integrated circuit MC14399, RC twin-T network is made up of adjustable resistance R1, resistance R 2, adjustable resistance R3, capacitor C 1, C2, C3, the mono-T network of RC is made up of resistance R 5, R6 and capacitor C 4, and the pin two of integrated circuit MC14399 connects pin 6 through resistance R 4; The output of twin-T network connects the pin 3 of integrated circuit MC14399;
In RC twin-T network, the value of resistance R 1, R2, R3 is respectively: 1R, 2 R, 2R;
The value of capacitor C 1, C2, C3 is respectively: 2C, 1C, 1C;
In RC twin-T network:
Trap frequency F=1/(2 π × R1C1); Trapper network Q value=R5/ (4 × R1).
The beneficial effects of the utility model are: the design of twin-T network adjustable notch filter device circuit, form multifrequency point high precision low frequency trapper by circuit design, trapper adopts twin-T network conditioned circuit to realize, twin-T network adjustable notch filter device method for designing has outstanding selecting frequency characteristic, has easy to adjust and frequency stabilization feature.Ensure that by twin-T network conditioned circuit communication equipment is reduced to minimum on the low-frequency disturbance impact in surrounding environment.
Brief description of the drawings
Fig. 1, twin-T network adjustable notch filter device circuit diagram.
Embodiment
Understand the utility model for clearer, describe in conjunction with the accompanying drawings and embodiments the utility model in detail:
As shown in Figure 1, the mono-T network of RC of amplifier, RC twin-T network and decision-making circuit Q value that twin-T network adjustable notch filter device circuit is is 1 by gain connects to form,
Amplifier adopts integrated circuit MC14399, RC twin-T network is by adjustable resistance R1, resistance R 2, adjustable resistance R3, capacitor C 1, C2, C3 form, and the mono-T network of RC is made up of resistance R 5, R6 and capacitor C 4, and the pin two of integrated circuit MC14399 connects pin 6 through resistance R 4; The output of twin-T network connects the pin 3 of integrated circuit MC14399;
The performing step of twin-T network adjustable notch filter device:
A) utilize formula to calculate trap frequency
Trap frequency F computing formula is formula 1-1:
F = 1/（2π×R1C1） 1-1
F--trap frequency;
Trapper network Q value computing formula 1-2:
Q =R5/(4×R1) 1-2
Q--trapper network Q value;
b)
From formula calculates, can find out that trapper centre frequency is mainly to be determined by twin-T network, and trapper Q value is mainly determined by single T network.R5=R6 in theory is calculated, but in fact, R5, R6 have affected the degree of balance of ripple filter window two arms, may need in practice to adjust.Due to the requirement of frequency accuracy (high stability) and assembly noise, must adopt high stability, low noise operational amplifier, we can select MC14399 amplifier here, its thermal noise voltage density is 3nV/(Hz) 1/2.
Table 1 is the calculating of trap frequency 50Hz, 60Hz to trapper classics, 100Hz, 120Hz, 150Hz, 180Hz below:
R1, the C1 that table 1 is different and C4, R5 value and corresponding Q and F trap.
According to the above description, can realize scheme of the present utility model in conjunction with art technology.
Claims (1)
1. twin-T network adjustable notch filter device, it is characterized in that, the mono-T network of RC of amplifier, RC twin-T network and decision-making circuit Q value that notch filter circuit is is 1 by gain connects to form, amplifier adopts integrated circuit MC14399, RC twin-T network is made up of adjustable resistance R1, resistance R 2, adjustable resistance R3, capacitor C 1, C2, C3, the mono-T network of RC is made up of resistance R 5, R6 and capacitor C 4, and the pin two of integrated circuit MC14399 connects pin 6 through resistance R 4; The output of twin-T network connects the pin 3 of integrated circuit MC14399; In RC twin-T network, the value of resistance R 1, R2, R3 is respectively: 1R, 2 R, 2R; The value of capacitor C 1, C2, C3 is respectively: 2C, 1C, 1C; In RC twin-T network: trap frequency F=1/(2 π × R1C1); Trapper network Q value=R5/ (4 × R1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320841350.1U CN203675061U (en) | 2013-12-19 | 2013-12-19 | Double-T network adjustable wave trap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320841350.1U CN203675061U (en) | 2013-12-19 | 2013-12-19 | Double-T network adjustable wave trap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203675061U true CN203675061U (en) | 2014-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320841350.1U Expired - Fee Related CN203675061U (en) | 2013-12-19 | 2013-12-19 | Double-T network adjustable wave trap |
Country Status (1)
| Country | Link |
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| CN (1) | CN203675061U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104902054A (en) * | 2015-06-24 | 2015-09-09 | 小米科技有限责任公司 | Method and device for filtering out interference frequency points of mobile terminal |
-
2013
- 2013-12-19 CN CN201320841350.1U patent/CN203675061U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104902054A (en) * | 2015-06-24 | 2015-09-09 | 小米科技有限责任公司 | Method and device for filtering out interference frequency points of mobile terminal |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 Termination date: 20161219 |