CN101902209A - LC elliptic function electrically-tunable filter - Google Patents
LC elliptic function electrically-tunable filter Download PDFInfo
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- CN101902209A CN101902209A CN201010233952XA CN201010233952A CN101902209A CN 101902209 A CN101902209 A CN 101902209A CN 201010233952X A CN201010233952X A CN 201010233952XA CN 201010233952 A CN201010233952 A CN 201010233952A CN 101902209 A CN101902209 A CN 101902209A
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- chip inductor
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Abstract
The invention provides an LC elliptic function electrically-tunable filter which relates to the field of electronic communications and aims at solving the technical problems of low rectangular factors, narrow working frequency band, complex structure, large size, and the like in the traditional electrically-tunable filter. The LC elliptic function electrically-tunable filter comprises a chip capacitor, a chip inductor, a chip resistor, a variable capacitance diode, and the like. The invention is suitable for the design of the electrically-tunable filter.
Description
Technical field
The present invention relates to electronic communication field, particularly a kind of electrically tunable filter that is used for communications industry fields such as radio station frequency modulation, Receiver And Transmitter frequency-selecting, switch filtering.
Background technology
Communication system realizes Signal Processing is just needed the separation of filter to signal under the information environment of complexity, selects useful signal, suppresses spuious interference signal, is a most important part in whole communication system.The electrically tunable filter that a variety of samples are also arranged on the current market, but these electrically tunable filters all are to adopt conventional Chebyshev's method to realize that the filter of this class electric tuning mainly contains following shortcoming:
1. squareness factor is not high, the operating frequency band is narrow, and the rectangle number of now seen on the market electrically tunable filter all is essentially: BW
-30dB/ BW
-3dB＜7, this requires all to be nowhere near to the machine system that has;
2. complex structure, volume are big.
Summary of the invention
Technical problems such as the present invention is intended to solve that the squareness factor that existing electrically tunable filter exists is not high, the operating frequency band is narrow, complex structure, volume are big are to provide a kind of high rectangle number, operational frequency bandwidth, LC elliptic function electrically-tunable filter that volume is little.
The objective of the invention is to be achieved through the following technical solutions.
LC elliptic function electrically-tunable filter of the present invention, input 1 is connected in series patch capacitor 1, chip inductor 1 and level Four loop in turn, the level Four loop is formed by first order loop to fourth stage loop serial connection, the three grades of loop circuit structures in back are identical with first order loop 20, and the second input patch capacitor to fourth stage loop is connected with the output patch capacitor in upper level loop;
Three loops in parallel in turn between the output of chip inductor 1 and the earth point, a loop is by chip inductor 24 serial connection patch capacitors 25 back ground connection; Another loop is variable capacitance diode one 6 ground connection; The 3rd loop be by chip inductor 37 serial connection patch capacitors 3 17 back ground connection, and chip inductor 37 also is connected with DC power supply 19;
Chip inductor 1 is connected with the input patch capacitor 8 in first order loop 20, is connected in series the input patch capacitor in chip inductor 4 11, output patch capacitor 13 and loop, the second level behind the input patch capacitor 8 in turn;
Three loops in parallel in turn between the output of chip inductor 4 11 and the earth point, a loop is chip inductor 5 14 ground connection; Another loop is variable capacitance diode 4 15 ground connection; The 3rd loop be by chip inductor 6 16 serial connection patch capacitors 4 18 back ground connection, and chip inductor 6 16 also is connected with DC power supply 19;
The input of the input of variable capacitance diode 29 and variable capacitance diode 3 10 is connected across the input/output terminal of chip inductor 4 11, the output of two variable capacitance diodes connects the input of Chip-R 12, and the output of Chip-R 12 connects the input patch capacitor in loop, the second level;
The output patch capacitor 20 in fourth stage loop is connected in series patch capacitor 5 21 in turn, chip inductor 7 22 backs are connected with output 23.
LC elliptic function electrically-tunable filter of the present invention, wherein said variable capacitance diode all adopts BB833, and Chip-R all adopts 0805, chip inductor all adopts 0805, patch capacitor all adopts 0805, and input 1 and output 23 are 50 ohm, and DC power supply 19 is 0V～10V.
The beneficial effect of LC elliptic function electrically-tunable filter of the present invention:
1. the filter squareness factor is brought up to: BW
-40dB/ BW
-3dB＜3.5, index obviously improves;
2. applicable in operating frequency band broad, the demanding system of squareness factor;
3. volume is little, can significantly reduce machine volume in the many complete machines of use filter quantity;
4. can be under various weather conditions and impact or vibration environment steady operation.
Description of drawings
Fig. 1 circuit theory diagrams of the present invention
The number in the figure explanation:
1 input, 2 patch capacitors one, 3 chip inductors one, 4 chip inductors two, 5 patch capacitors two, 6 variable capacitance diodes one, 7 chip inductors three, 8 input patch capacitors, 9 variable capacitance diodes two, 10 variable capacitance diodes three, 11 chip inductors four, 12 Chip-Rs, 13 output patch capacitors, 14 chip inductors five, 15 variable capacitance diodes four, 16 chip inductors six, 17 patch capacitors three, 18 patch capacitors four, 19 DC power supply, 20 first order loops, 21 patch capacitors five, 22 chip inductors seven, 23 outputs
Embodiment
Detailed structure of the present invention, application principle, effect and effect with reference to accompanying drawing 1, are illustrated by following execution mode.
Consult shown in Figure 1, LC elliptic function electrically-tunable filter of the present invention, input 1 is connected in series patch capacitor 1, chip inductor 1 and level Four loop in turn, the level Four loop is formed by first order loop to fourth stage loop serial connection, the three grades of loop circuit structures in back are identical with first order loop 20, and the second input patch capacitor to fourth stage loop is connected with the output patch capacitor in upper level loop;
Three loops in parallel in turn between the output of chip inductor 1 and the earth point, a loop is by chip inductor 24 serial connection patch capacitors 25 back ground connection; Another loop is variable capacitance diode one 6 ground connection; The 3rd loop be by chip inductor 37 serial connection patch capacitors 3 17 back ground connection, and chip inductor 37 also is connected with DC power supply 19;
Chip inductor 1 is connected with the input patch capacitor 8 in first order loop 20, is connected in series the input patch capacitor in chip inductor 4 11, output patch capacitor 13 and loop, the second level behind the input patch capacitor 8 in turn;
Three loops in parallel in turn between the output of chip inductor 4 11 and the earth point, a loop is chip inductor 5 14 ground connection; Another loop is variable capacitance diode 4 15 ground connection; The 3rd loop be by chip inductor 6 16 serial connection patch capacitors 4 18 back ground connection, and chip inductor 6 16 also is connected with DC power supply 19;
The input of the input of variable capacitance diode 29 and variable capacitance diode 3 10 is connected across the input/output terminal of chip inductor 4 11, the output of two variable capacitance diodes connects the input of Chip-R 12, and the output of Chip-R 12 connects the input patch capacitor in loop, the second level;
The output patch capacitor 20 in fourth stage loop is connected in series patch capacitor 5 21 in turn, chip inductor 7 22 backs are connected with output 23.
LC elliptic function electrically-tunable filter of the present invention, wherein said variable capacitance diode all adopts BB833, and Chip-R all adopts 0805, chip inductor all adopts 0805, patch capacitor all adopts 0805, and input 1 and output 23 are 50 ohm, and DC power supply 19 is 0V～10V.
LC electric tuning elliptic function filter of the present invention, the tuned frequency that is meant filter along with change alive size change that this principle of variable capacitance diode appearance value realizes.In Chebyshev's circuit of routine, added elliptic function filter characteristic, made the squareness factor of whole filter reach BW
-40dB/ BW
-3dB＜3.5, great raising is arranged.
Through experimental verification, LC electric tuning elliptic function filter of the present invention has been realized technical indicators such as high squareness factor, low insertion loss fully.
Therefore LC elliptic function electrically-tunable filter of the present invention has wave filter squareness factor index and improves obviously; In, the demanding system of squareness factor wider applicable to the operating frequency band; Volume is little, can greatly reduce machine volume in the many complete machines of use wave filter quantity; Can be under various weather conditions and impact or vibration environment the plurality of advantages such as steady operation.
Claims (2)
1.LC elliptic function electrically-tunable filter, it is characterized in that: input (1) is connected in series patch capacitor one (2), chip inductor one (3) and level Four loop in turn, the level Four loop is formed by first order loop to fourth stage loop serial connection, the three grades of loop circuit structures in back are identical with first order loop (20), and the second input patch capacitor to fourth stage loop is connected with the output patch capacitor in upper level loop;
Three loops in parallel in turn between the output of chip inductor one (3) and the earth point, a loop is by chip inductor two (4) serial connection patch capacitors two (5) back ground connection; Another loop is variable capacitance diode one (a 6) ground connection; The 3rd loop be by chip inductor three (7) serial connection patch capacitors three (17) back ground connection, and chip inductor three (7) also is connected with DC power supply (19);
Chip inductor one (3) is connected with the input patch capacitor (8) of first order loop (20), is connected in series the input patch capacitor in chip inductor four (11), output patch capacitor (13) and loop, the second level behind the input patch capacitor (8) in turn; Three loops in parallel in turn between the output of chip inductor four (11) and the earth point, a loop is chip inductor five (14) ground connection; Another loop is variable capacitance diode four (15) ground connection; The 3rd loop be by chip inductor six (16) serial connection patch capacitors four (18) back ground connection, and chip inductor six (16) also is connected with DC power supply (19);
The input of the input of variable capacitance diode two (9) and variable capacitance diode three (10) is connected across the input/output terminal of chip inductor four (11), the output of two variable capacitance diodes connects the input of Chip-R (12), and the output of Chip-R (12) connects the input patch capacitor in loop, the second level;
The output patch capacitor (20) in fourth stage loop is connected in series patch capacitor five (21) in turn, chip inductor seven (22) backs are connected with output (23).
2. LC elliptic function electrically-tunable filter according to claim 1, it is characterized in that: described variable capacitance diode all adopts BB833, Chip-R all adopts 0805, chip inductor all adopts 0805, patch capacitor all adopts 0805, input (1) and output (23) are 50 ohm, and DC power supply (19) is 0V～10V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010233952XA CN101902209A (en) | 2010-07-22 | 2010-07-22 | LC elliptic function electrically-tunable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010233952XA CN101902209A (en) | 2010-07-22 | 2010-07-22 | LC elliptic function electrically-tunable filter |
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| Publication Number | Publication Date |
|---|---|
| CN101902209A true CN101902209A (en) | 2010-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010233952XA Pending CN101902209A (en) | 2010-07-22 | 2010-07-22 | LC elliptic function electrically-tunable filter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883152A (en) * | 2015-05-19 | 2015-09-02 | 北京中科飞鸿科技有限公司 | Broadband and low-fluctuation band-pass LC filter |
| CN105141272A (en) * | 2015-06-30 | 2015-12-09 | 云南电网有限责任公司昆明供电局 | Power filter circuit and power filter for broadband power line carrier communication test system |
| CN105406833A (en) * | 2015-12-15 | 2016-03-16 | 成都九洲迪飞科技有限责任公司 | Intermediate-frequency electrically tunable band-pass filter having fixed inductance value |
| CN111835308A (en) * | 2020-07-15 | 2020-10-27 | 武汉博畅通信设备有限责任公司 | Numerical control electric regulation filter |
-
2010
- 2010-07-22 CN CN201010233952XA patent/CN101902209A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883152A (en) * | 2015-05-19 | 2015-09-02 | 北京中科飞鸿科技有限公司 | Broadband and low-fluctuation band-pass LC filter |
| CN104883152B (en) * | 2015-05-19 | 2018-02-13 | 北京中科飞鸿科技有限公司 | A kind of broadband, low fluctuation band logical LC wave filters |
| CN105141272A (en) * | 2015-06-30 | 2015-12-09 | 云南电网有限责任公司昆明供电局 | Power filter circuit and power filter for broadband power line carrier communication test system |
| CN105406833A (en) * | 2015-12-15 | 2016-03-16 | 成都九洲迪飞科技有限责任公司 | Intermediate-frequency electrically tunable band-pass filter having fixed inductance value |
| CN105406833B (en) * | 2015-12-15 | 2018-07-06 | 成都九洲迪飞科技有限责任公司 | A kind of intermediate frequency electrically adjusted band-pass filter with fixed inductance amount |
| CN111835308A (en) * | 2020-07-15 | 2020-10-27 | 武汉博畅通信设备有限责任公司 | Numerical control electric regulation filter |
| CN111835308B (en) * | 2020-07-15 | 2023-09-05 | 武汉博畅通信设备有限责任公司 | Numerical control electrically tunable filter |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20101201 |