CN204180028U - A kind of electrically tunable filter - Google Patents
A kind of electrically tunable filter Download PDFInfo
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- CN204180028U CN204180028U CN201420665321.9U CN201420665321U CN204180028U CN 204180028 U CN204180028 U CN 204180028U CN 201420665321 U CN201420665321 U CN 201420665321U CN 204180028 U CN204180028 U CN 204180028U
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- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 238000010923 batch production Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
The utility model discloses a kind of electrically tunable filter, be provided with inductance L 1 and L2, one end of L1 is as the input of filter, one end of L2, as the output of filter, is connected with two-stage quadripole between L1 and L2, and the first quadripole is made up of variable capacitance diode D1, D3, D5 and resistance R1, D1, D3 and D5 common cathode is connected and connects tuning power supply through R1, the anode of D1 as the input of the first quadripole, the anode of D3 as output, the plus earth of D5; Second quadripole is made up of variable capacitance diode D2, D4, D6 and resistance R2, and connected mode is identical with the first quadripole; The two ends of L1 are parallel with L3 and L4 respectively, and the two ends of L2 are parallel with L5 and L6 respectively, between the first quadripole and the second quadripole, be also parallel with resistance R3.Its remarkable result is: circuit structure is simple, and it is convenient to control, and the electricity that can realize 900MHz-1500MHz preferably adjusts bandpass filtering, achieves miniaturization and the cost degradation of circuit.
Description
Technical field
The utility model relates to a kind of filter circuit, specifically, is a kind of electrically tunable filter.
Background technology
Electrically tunable filter is the critical component in communication system, and due to the regulable center frequency of electrically tunable filter, the signal of assigned frequency can pass through, and the signal beyond assigned frequency will be reflected, thus achieves numerous He Ne laser function.
But the usual tuning range of electrically tunable filter commercially available is at present narrow, insertion loss large, price is higher.Along with the application of reality needs, require receiver radio frequency front-end preselection filter filter with low insertion loss, low passband fluctuation, high signal-selectivity, volume is little as far as possible simultaneously, to meet the performance of receiver high sensitivity and high dynamic range.
Utility model content
Only in view of this, the utility model provides a kind of electrically tunable filter, adopts simple as far as possible circuit to meet the application of high performance receiver radio-frequency front-end, under the prerequisite meeting property indices, reduces circuit cost as far as possible, be convenient to batch production.
For achieving the above object, the utility model states a kind of electrically tunable filter, its key is: be provided with inductance L 1 and inductance L 2, one end of inductance L 1 is as the input of filter, one end of inductance L 2 is as the output of filter, two-stage quadripole is connected with between inductance L 1 and inductance L 2, wherein:
First quadripole is made up of variable capacitance diode D1, variable capacitance diode D3, variable capacitance diode D5 and resistance R1, described variable capacitance diode D1, variable capacitance diode D3 and variable capacitance diode D5 common cathode are connected and connect tuning power supply through resistance R1, the anode of variable capacitance diode D1 is as the input of described first quadripole, the anode of variable capacitance diode D3 as the output of described first quadripole, the plus earth of variable capacitance diode D5;
Second quadripole is made up of variable capacitance diode D2, variable capacitance diode D4, variable capacitance diode D6 and resistance R2, and circuit connecting mode is identical with the first quadripole;
The two ends of described inductance L 1 are parallel with inductance L 3 and inductance L 4 respectively, and the two ends of described inductance L 2 are parallel with inductance L 5 and inductance L 6 respectively, between the first quadripole and the second quadripole, be also parallel with resistance R3.
As further describing, described inductance L 1, inductance L 2, inductance L 3, inductance L 4, inductance L 5 and inductance L 6 all adopt the high-frequency inductor of 10nH.
In order to reduce the insertion loss of filter, described variable capacitance diode D1, variable capacitance diode D2, variable capacitance diode D3, variable capacitance diode D4, variable capacitance diode D5 and variable capacitance diode D6 adopt model to be BB857, are high q-factor variable capacitance diode.
Be 900MHz-1500MHz to realize tunable center frequency, in conjunction with the capacitance variation characteristic of variable capacitance diode, described tuning power supply is the DC power supply of 1.5 ~ 22V.
As preferably, the resistance of described resistance R1, resistance R2 and resistance R3 is 1000 ohm.
Remarkable result of the present utility model is: circuit structure is simple, and it is convenient to control, and the electricity that can realize 900MHz-1500MHz preferably adjusts bandpass filtering, achieves miniaturization and the cost degradation of circuit.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model and operation principle are described in further detail.
As shown in Figure 1, a kind of electrically tunable filter, is provided with inductance L 1 and inductance L 2, and one end of inductance L 1 is as the input of filter, and one end of inductance L 2, as the output of filter, is connected with two-stage quadripole between inductance L 1 and inductance L 2, wherein:
First quadripole is made up of variable capacitance diode D1, variable capacitance diode D3, variable capacitance diode D5 and resistance R1, described variable capacitance diode D1, variable capacitance diode D3 and variable capacitance diode D5 common cathode are connected and connect tuning power supply through resistance R1, the anode of variable capacitance diode D1 is as the input of described first quadripole, the anode of variable capacitance diode D3 as the output of described first quadripole, the plus earth of variable capacitance diode D5;
Second quadripole is made up of variable capacitance diode D2, variable capacitance diode D4, variable capacitance diode D6 and resistance R2, and circuit connecting mode is identical with the first quadripole, and as can be seen from Fig. 1 also, circuit becomes symmetrical structure;
The two ends of described inductance L 1 are parallel with inductance L 3 and inductance L 4 respectively, and the two ends of described inductance L 2 are parallel with inductance L 5 and inductance L 6 respectively, between the first quadripole and the second quadripole, be also parallel with resistance R3.
In implementation process, in order to the electricity meeting 900MHz-1500MHz adjusts bandpass filtering, inductance L 1, inductance L 2, inductance L 3, inductance L 4, inductance L 5 and inductance L 6 all adopt the high-frequency inductor of 10nH, the BB857 that described variable capacitance diode D1, variable capacitance diode D2, variable capacitance diode D3, variable capacitance diode D4, variable capacitance diode D5 and variable capacitance diode D6 adopt semiconductor company of Infineon to produce, tuning power supply is the DC power supply of 1.5 ~ 22V, and the resistance of resistance R1, resistance R2 and resistance R3 is 1000 ohm.
Operation principle of the present utility model is:
LC duopole capacitance coupling type filter is adopted to be prototype, resonant tank is shunt-resonant circuit, be coupled by inductance or electric capacity, when variable capacitance diode adding different direct current (DC) biases, the capacitance of variable capacitance diode can change, and the resonance frequency of single resonator also changes, and the centre frequency of filter is correspondingly moved, thus realize the electric tuning of filter, use the variable capacitance diode of high q-factor can reduce the insertion loss of filter.
Whole circuit structure is reasonable, achieve miniaturization and the cost degradation of circuit, and the indices such as its 1dB bandwidth, stopband suppression, insertion loss all reaches expection technical requirement.
Claims (5)
1. an electrically tunable filter, is characterized in that: be provided with inductance L 1 and inductance L 2, and one end of inductance L 1 is as the input of filter, and one end of inductance L 2, as the output of filter, is connected with two-stage quadripole between inductance L 1 and inductance L 2, wherein:
First quadripole is made up of variable capacitance diode D1, variable capacitance diode D3, variable capacitance diode D5 and resistance R1, described variable capacitance diode D1, variable capacitance diode D3 and variable capacitance diode D5 common cathode are connected and connect tuning power supply through resistance R1, the anode of variable capacitance diode D1 is as the input of described first quadripole, the anode of variable capacitance diode D3 as the output of described first quadripole, the plus earth of variable capacitance diode D5;
Second quadripole is made up of variable capacitance diode D2, variable capacitance diode D4, variable capacitance diode D6 and resistance R2, and circuit connecting mode is identical with the first quadripole;
The two ends of described inductance L 1 are parallel with inductance L 3 and inductance L 4 respectively, and the two ends of described inductance L 2 are parallel with inductance L 5 and inductance L 6 respectively, between the first quadripole and the second quadripole, be also parallel with resistance R3.
2. a kind of electrically tunable filter according to claim 1, is characterized in that: described inductance L 1, inductance L 2, inductance L 3, inductance L 4, inductance L 5 and inductance L 6 all adopt the high-frequency inductor of 10nH.
3. a kind of electrically tunable filter according to claim 2, is characterized in that: described variable capacitance diode D1, variable capacitance diode D2, variable capacitance diode D3, variable capacitance diode D4, variable capacitance diode D5 and variable capacitance diode D6 adopt model to be BB857.
4. a kind of electrically tunable filter according to claim 3, is characterized in that: described tuning power supply is the DC power supply of 1.5 ~ 22V.
5. a kind of electrically tunable filter according to claim 4, is characterized in that: the resistance of described resistance R1, resistance R2 and resistance R3 is 1000 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420665321.9U CN204180028U (en) | 2014-11-06 | 2014-11-06 | A kind of electrically tunable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420665321.9U CN204180028U (en) | 2014-11-06 | 2014-11-06 | A kind of electrically tunable filter |
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| Publication Number | Publication Date |
|---|---|
| CN204180028U true CN204180028U (en) | 2015-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420665321.9U Active CN204180028U (en) | 2014-11-06 | 2014-11-06 | A kind of electrically tunable filter |
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| Country | Link |
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| CN (1) | CN204180028U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114710129A (en) * | 2022-04-19 | 2022-07-05 | 电子科技大学 | Electrically tunable filter and method for widening tuning range |
-
2014
- 2014-11-06 CN CN201420665321.9U patent/CN204180028U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114710129A (en) * | 2022-04-19 | 2022-07-05 | 电子科技大学 | Electrically tunable filter and method for widening tuning range |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Building 2, No. 25 Qiangwei Road, Changshengqiao Town, Nan'an District, Chongqing, 401336 Patentee after: CHONGQING HUILING ELECTRON NEW TECHNOLOGY Co.,Ltd. Country or region after: China Address before: 401336 No. 7 Camellia Road, Nan'an District, Chongqing Patentee before: CHONGQING HUILING ELECTRON NEW TECHNOLOGY Co.,Ltd. Country or region before: China |
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| CP03 | Change of name, title or address |