CN204031096U - A kind of electrically tunable filter of high P-1 index - Google Patents
A kind of electrically tunable filter of high P-1 index Download PDFInfo
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- CN204031096U CN204031096U CN201420473619.XU CN201420473619U CN204031096U CN 204031096 U CN204031096 U CN 204031096U CN 201420473619 U CN201420473619 U CN 201420473619U CN 204031096 U CN204031096 U CN 204031096U
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Abstract
The utility model relates to a kind of electrically tunable filter of high P-1 index, include signal input part, signal output part and voltage tuning port, the electric capacity being parallel to ground in former electrically tunable filter is optimized for four variable capacitance diode parallel connections by the utility model, by these four variable capacitance diode reversal connections, namely negative pole connects voltage tuning port, plus earth, this prioritization scheme for pc equivalent circuit without any impact, four newly-increased variable capacitance diodes are the same effects with electric capacity before, the electricity that so there is no change this electrically tunable filter adjusts voltage, but for ac equivalent circuit, four newly-increased variable capacitance diodes are equivalent to connect with former variable capacitance diode, the alternating voltage being loaded into former variable capacitance diode two ends is made to reduce half, greatly improve its resistance to compression, thus improve the P-1 index of electrically tunable filter.
Description
Technical field
The utility model relates to a kind of electrically tunable filter, specifically a kind of electrically tunable filter of high P-1 index.
Background technology
Along with the development of modern electronics industry technology, in various electronic equipment and control system, the application of filter is more and more extensive.The quality of performance of filter also directly affects the quality of electronic product, so more and more higher to the performance requirement of filter.The kind of filter is a lot, leads to and be with the types such as resistance according to can be divided into low pass, high pass, band to the processing capacity of signal.Electrically tunable filter is a kind of tunable band pass filter, and it has two aspect considerable advantages: on filtering characteristic, can carry out linear regulation signal frequency passband according to actual needs by tuning voltage; On installing and using, it has small volume, the simple feature of interface, has important function to the miniaturization of receiver complete machine.Therefore, electrically tunable filter has a wide range of applications in various machine system.
The electrically tunable filter product can looked at present is not made P-1 index and being explicitly called for, the P-1 index measured value of general electrically tunable filter is about 0dBm, higher also can only reach about+7dBm, can not meet the use occasion of some high power requirements such as Larger Dynamic receiver system.
Utility model content
The purpose of this utility model is to provide a kind of electrically tunable filter of high P-1 index, low to solve existing electrically tunable filter P-1 index measured value, can not meet the problem of the demand of the high power electronic products such as Larger Dynamic receiver system.
The purpose of this utility model is achieved in that
A kind of electrically tunable filter of high P-1 index, include signal input part, signal output part and voltage tuning port, signal input part connects the LC filter circuit connected to form by the first controllable impedance and the first electric capacity after being connected in series the first inductance, the output of a described LC filter circuit divides two-way, one tunnel connects the T-shaped three end filter circuit connected to form by the 3rd inductance, the 4th inductance and the 5th inductance, another road is connected on the positive pole of the first diodes in parallel circuit, connects voltage tuning port after the negative pole of the first diodes in parallel circuit is connected in series the first resistance; The output of described T-shaped three end filter circuit divides two-way, one tunnel connects the 2nd LC filter circuit connected to form by the second controllable impedance and the second electric capacity, another road is connected on the positive pole of the second diodes in parallel circuit, connects voltage tuning port after the negative pole of the second diodes in parallel circuit is connected in series the second resistance; Signal output part is connect after sliding end serial connection the 7th inductance of the second controllable impedance; The 3rd diodes in parallel circuit is connected to, the plus earth of the 3rd diodes in parallel circuit between the negative pole and ground wire of the first diodes in parallel circuit; The 4th diodes in parallel circuit is connected to, the plus earth of the 4th diodes in parallel circuit between the negative pole and ground wire of the second diodes in parallel circuit.
The electrically tunable filter of high P-1 index described in the utility model, described first diodes in parallel circuit, described second diodes in parallel circuit, described 3rd diodes in parallel circuit and described 4th diodes in parallel circuit are all compose in parallel diodes in parallel circuit by four variable capacitance diodes.
The technical solution of the utility model for pc equivalent circuit without any impact, but for ac equivalent circuit, four newly-increased variable capacitance diodes are equivalent to connect with former variable capacitance diode, the alternating voltage being loaded into former variable capacitance diode two ends is made to reduce half, greatly improve its resistance to compression, thus improve the P-1 index of electrically tunable filter.Electrically tunable filter of the present utility model, when not affecting other technical indicator, the P-1 index measured value of electrically tunable filter reaches+15dBm.
Accompanying drawing explanation
Fig. 1 is the circuit topological structure figure of the electrically tunable filter of the utility model height P-1 index.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, the utility model includes signal input part, signal output part and voltage tuning port,
The LC filter circuit composed in parallel by the first controllable impedance L2 and the first electric capacity C1 is connect after signal input part is connected in series the first inductance L 1, wherein, first inductance L 1 connects the sliding end of controllable impedance L2 in a LC filter circuit, stiff end one end ground connection of controllable impedance L2, the other end is the output of a LC filter circuit;
The output of the one LC filter circuit is divided into two-way, wherein a road connects the T-shaped three end filter circuit be made up of the 3rd inductance L 3, the 4th inductance L 4 and the 5th inductance L 5, another road connects the positive pole of the first diodes in parallel circuit D1, connects voltage tuning port after the negative pole of the first diodes in parallel circuit D1 is connected in series the first resistance R1;
3rd inductance L 3 of T-shaped three end filter circuit connects the output of a LC filter circuit, 4th inductance L 4 ground connection, one end of 5th inductance is the output of T-shaped three end filter circuit, its output is divided into two-way, wherein a road connects the 2nd LC filter circuit composed in parallel by the second controllable impedance L6 and the second electric capacity C2, another road connects the positive pole of the second diodes in parallel circuit D2, connects voltage tuning port after the negative pole of the second diodes in parallel circuit D2 is connected in series the second resistance R2;
Signal output part is connect, another stiff end ground connection of the second controllable impedance L6 after sliding end serial connection the 7th inductance L 7 of the second controllable impedance L6;
The 3rd diodes in parallel circuit D3 is serially connected with between the negative pole and ground wire of the first diodes in parallel circuit D1, the plus earth of the 3rd diodes in parallel circuit D3, the 4th diodes in parallel circuit D4 is serially connected with, the plus earth of the 4th diodes in parallel circuit D4 between the negative pole and ground wire of the second diodes in parallel circuit D2.
In the utility model, the first diodes in parallel circuit D1, the second diodes in parallel circuit D2, the 3rd diodes in parallel circuit D3 and the 4th diodes in parallel circuit D4 compose in parallel diodes in parallel circuit by four variable capacitance diodes.
The electric capacity being parallel to ground in former electrically tunable filter is optimized for four variable capacitance diode parallel connections by the utility model, by these four variable capacitance diode reversal connections, namely negative pole connects voltage tuning port, plus earth, the two ends of a controllable impedance electric capacity in parallel in former electrically tunable filter simultaneously, this prioritization scheme for pc equivalent circuit without any impact, four newly-increased variable capacitance diodes are the same effects with electric capacity before, the electricity that so there is no change this electrically tunable filter adjusts voltage, but for ac equivalent circuit, four newly-increased variable capacitance diodes are equivalent to connect with former variable capacitance diode, the alternating voltage being loaded into former variable capacitance diode two ends is made to reduce half, greatly improve its resistance to compression, thus improve the P-1 index of electrically tunable filter.
The technical solution of the utility model, when not affecting other index of electrically tunable filter, the P-1 index of electrically tunable filter reaches more than+15dBm, is applicable to being applied in having in the Larger Dynamic receiver system of high power requirement.
The foregoing is only preferred embodiments of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (2)
1. the electrically tunable filter of one kind high P-1 index, include signal input part, signal output part and voltage tuning port, it is characterized in that, signal input part connects the LC filter circuit connected to form by the first controllable impedance and the first electric capacity after being connected in series the first inductance, the output of a described LC filter circuit divides two-way, one tunnel connects the T-shaped three end filter circuit connected to form by the 3rd inductance, the 4th inductance and the 5th inductance, another road is connected on the positive pole of the first diodes in parallel circuit, connects voltage tuning port after the negative pole of the first diodes in parallel circuit is connected in series the first resistance; The output of described T-shaped three end filter circuit divides two-way, one tunnel connects the 2nd LC filter circuit connected to form by the second controllable impedance and the second electric capacity, another road is connected on the positive pole of the second diodes in parallel circuit, connects voltage tuning port after the negative pole of the second diodes in parallel circuit is connected in series the second resistance; Signal output part is connect after sliding end serial connection the 7th inductance of the second controllable impedance; The 3rd diodes in parallel circuit is connected to, the plus earth of the 3rd diodes in parallel circuit between the negative pole and ground wire of the first diodes in parallel circuit; The 4th diodes in parallel circuit is connected to, the plus earth of the 4th diodes in parallel circuit between the negative pole and ground wire of the second diodes in parallel circuit.
2. the electrically tunable filter of high P-1 index according to claim 1, it is characterized in that, described first diodes in parallel circuit, described second diodes in parallel circuit, described 3rd diodes in parallel circuit and described 4th diodes in parallel circuit are all compose in parallel diodes in parallel circuit by four variable capacitance diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420473619.XU CN204031096U (en) | 2014-08-21 | 2014-08-21 | A kind of electrically tunable filter of high P-1 index |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420473619.XU CN204031096U (en) | 2014-08-21 | 2014-08-21 | A kind of electrically tunable filter of high P-1 index |
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| CN204031096U true CN204031096U (en) | 2014-12-17 |
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| CN201420473619.XU Active CN204031096U (en) | 2014-08-21 | 2014-08-21 | A kind of electrically tunable filter of high P-1 index |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017166199A1 (en) * | 2016-03-31 | 2017-10-05 | 华为技术有限公司 | Method and device for suppressing interference signal |
| CN110289831A (en) * | 2019-06-25 | 2019-09-27 | 电子科技大学 | A kind of high low pass combination LC band logical electrically tunable filter |
| CN114710129A (en) * | 2022-04-19 | 2022-07-05 | 电子科技大学 | Electrically tunable filter and method for widening tuning range |
-
2014
- 2014-08-21 CN CN201420473619.XU patent/CN204031096U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017166199A1 (en) * | 2016-03-31 | 2017-10-05 | 华为技术有限公司 | Method and device for suppressing interference signal |
| CN110289831A (en) * | 2019-06-25 | 2019-09-27 | 电子科技大学 | A kind of high low pass combination LC band logical electrically tunable filter |
| 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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