CN101667816B - Electrically tunable filter - Google Patents
Electrically tunable filter Download PDFInfo
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- CN101667816B CN101667816B CN2009101676152A CN200910167615A CN101667816B CN 101667816 B CN101667816 B CN 101667816B CN 2009101676152 A CN2009101676152 A CN 2009101676152A CN 200910167615 A CN200910167615 A CN 200910167615A CN 101667816 B CN101667816 B CN 101667816B
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Abstract
The invention provides an electrically tunable filter, relating to the technical field of electrocommunication, aiming at solving the technical problems of narrow tunable bandwidth, the frequency being less than 1G, bad reliability, big insertion loss, limited signal receiving range and the like existing in the prior electrically tunable filter products. N series inductances are connected in series between the radio frequency input end and the radio frequency output end in the invention; N-1 parallel inductances and N-1 three-terminal circuits are connected in parallel between N series inductances; one end of each parallel inductance is connected between the above two adjacent series inductances and the other end thereof is connected to the ground; one of the three-terminal circuits is a variable capacitance diode, the input end thereof is connected between the input ends of the above adjacent parallel inductances and the input ends of the parallel inductances, and the output end thereof is connected with the other circuit of capacitance of the three-terminal circuit and then is connected to the ground; and the input end of the filter inductance is connected between the output end of the variable capacitance diode and the input end of the capacitance, and the output end thereof is connected with a voltage control end. The invention is applicable to the fields of microwave communication, ultra wideband receivers, electronic devices and the like.
Description
Technical field
The present invention relates to communication technical field, a kind of especially electrically tunable filter that is used for microwave communication, ultra wideband receiver, electronic equipment etc.
Background technology
Electrically tunable filter is parts crucial in the communication system, because the centre frequency of electrically tunable filter is adjustable, the signal of assigned frequency can pass through device, and the energy beyond the constant-frequency signal is reflected, thereby has realized the function that numerous frequency is selected.Mainly there is following problem in electrically tunable filter in the market:
1. adjustable band width;
2. frequency is less than 1G;
3. poor reliability;
4. Insertion Loss is big, and signal is accepted to be limited in scope, and receiver noise factor is big.
Summary of the invention
The present invention is intended to solve the adjustable band width that exists in the existing electrically tunable filter product, frequency less than 1G, poor reliability, technical problem such as Insertion Loss is big, signal is accepted to be limited in scope, receiver noise factor is big, and a kind of Insertion Loss is little, volume is little to provide, adjustable frequency wide ranges, good reliability, signal are accepted the electrically tunable filter that scope is big, reduce receiver noise factor.
The objective of the invention is to realize through following technical scheme.
Electrically tunable filter of the present invention; Be serially connected with N series inductance L1-L4, a N-1 shunt inductance L5-L7 and N-1 three terminal circuits between RF signal input end and the radiofrequency signal output, a shunt inductance of parallel connection and one three terminal circuit between adjacent two series inductances; One of shunt inductance is terminated between adjacent two series inductances, its other end ground connection; Three terminal circuits one the tunnel are variable capacitance diode D1 wherein; The input of variable capacitance diode D1 is connected between the input of second series inductance L2 in input and adjacent two series inductances of shunt inductance L5; Its output is connected in series another road capacitor C 1 back ground connection of three terminal circuits; Filter inductance L8 is the Third Road of three terminal circuits, and its input is connected between the input of output and capacitor C 1 of variable capacitance diode D1, and its output connects voltage controling end.
Electrically tunable filter of the present invention, wherein said N are 4
The beneficial effect of electrically tunable filter of the present invention:
1. Insertion Loss is little, can increase the scope of accepting of signal, reduces receiver noise factor;
2. the adjustable frequency wide ranges can segmentation cover 30M～2G;
3. little, the good reliability of volume.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention
Fig. 2 uses sketch map for the present invention in ultra wideband receiver
Label declaration among the figure:
D1～D3: variable capacitance diode
L1～L7: inductance
C1～C3: electric capacity
L9～L10: filter inductance
RFI: RF signal input end
RFO: radiofrequency signal output
LPA: low noise amplifier
BPF: band pass filter
Embodiment
Detailed structure of the present invention, application principle, effect and effect are explained through following execution mode with reference to accompanying drawing 1-2.
Be serially connected with 4 series inductance L1-L4 between electrically tunable filter RF signal input end of the present invention and the radiofrequency signal output, be parallel with 3 shunt inductance L5-L7 and 3 three terminal circuits between 4 series inductance L1-L4; One of shunt inductance is terminated between aforementioned adjacent two series inductances, its other end ground connection; Three terminal circuits one the tunnel are variable capacitance diode D1 wherein; The input of variable capacitance diode D1 is connected between the input of input and series inductance L2 of aforementioned adjacent shunt inductance L5; Its output is connected in series another road capacitor C 1 back ground connection of three terminal circuits; The input of filter inductance L8 is connected between the input of output and capacitor C 1 of variable capacitance diode D1, and its output connects voltage controling end.
This electrically tunable filter mainly is made up of inductance, electric capacity, high Q value variable capacitance diode, and this circuit structure is simple, practicality.The voltage of control end raises, and the capacity of variable capacitance diode D1, D2, D3 is reduced, and filter resonance frequency increases; Otherwise then the resonance frequency of filter reduces; Thereby realized regulating automatically, made this filter can realize the selection function of countless a plurality of frequencies, made system obtain simplifying through external voltage; Practice thrift the number of filtering, reduced the cost of complete machine.
Below use in ultra wideband receiver through the present invention the present invention further described:
Frequency is that the radiofrequency signal RFI of 1GHz is after low noise amplifier LPA amplifies; To the RF switch selections, get into electrically tunable filter 4; Single-chip microcomputer receives the control voltage that corresponding frequency point information is adjusted electrically tunable filter 4 automatically, makes its filter frequencies be stabilized in the 1GHz place, filter unnecessary spurious signal by electrically tunable filter 4 after; Be converted to the intermediate frequency baseband signal through frequency mixer and export to radiofrequency signal output RFO after again by band pass filter BPF filtering, handle and demodulation by the digital processing plate thereafter.
From the above, electrically tunable filter of the present invention, it is little to have an Insertion Loss, can increase the scope of accepting of signal, reduces receiver noise factor; The adjustable frequency wide ranges can segmentation cover 30M～2G; Plurality of advantages such as volume is little, good reliability.
Claims (2)
1. electrically tunable filter; It is characterized in that: be serially connected with N series inductance (L1-L4), a N-1 shunt inductance (L5-L7) and N-1 three terminal circuits between RF signal input end and the radiofrequency signal output, a shunt inductance of parallel connection and one three terminal circuit between adjacent two series inductances; One of shunt inductance is terminated between adjacent two series inductances, its other end ground connection; Three terminal circuits one the tunnel are variable capacitance diode (D1) wherein; The input of variable capacitance diode (D1) is connected between the input of second series inductance (L2) in input and adjacent two series inductances of shunt inductance (L5); Its output is connected in series another road electric capacity (C1) back ground connection of three terminal circuits; Filter inductance (L8) is the Third Road of three terminal circuits, and its input is connected between the input of output and electric capacity (C1) of variable capacitance diode (D1), and its output connects voltage controling end.
2. electrically tunable filter as claimed in claim 1 is characterized in that: said N is 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101676152A CN101667816B (en) | 2009-09-14 | 2009-09-14 | Electrically tunable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101676152A CN101667816B (en) | 2009-09-14 | 2009-09-14 | Electrically tunable filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101667816A CN101667816A (en) | 2010-03-10 |
| CN101667816B true CN101667816B (en) | 2012-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101676152A Expired - Fee Related CN101667816B (en) | 2009-09-14 | 2009-09-14 | Electrically tunable filter |
Country Status (1)
| Country | Link |
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| CN (1) | CN101667816B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104359A (en) * | 2014-07-15 | 2014-10-15 | 深圳市森虎科技有限公司 | Radio frequency filter circuit |
| 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 |
| CN105450198A (en) * | 2015-12-31 | 2016-03-30 | 陕西烽火电子股份有限公司 | Dielectric resonator type electrically tunable filter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4153887A (en) * | 1977-12-05 | 1979-05-08 | The Magnavox Company | Electrically tunable bandpass filter |
| US6097269A (en) * | 1999-02-01 | 2000-08-01 | Motorola, Inc. | Electrically tunable band pass filter with symmetrical low-side and high-side protection |
| CN201039101Y (en) * | 2007-06-01 | 2008-03-19 | 中国电子科技集团公司第五十四研究所 | Power modulation filter frequency calibration device |
-
2009
- 2009-09-14 CN CN2009101676152A patent/CN101667816B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4153887A (en) * | 1977-12-05 | 1979-05-08 | The Magnavox Company | Electrically tunable bandpass filter |
| US6097269A (en) * | 1999-02-01 | 2000-08-01 | Motorola, Inc. | Electrically tunable band pass filter with symmetrical low-side and high-side protection |
| CN201039101Y (en) * | 2007-06-01 | 2008-03-19 | 中国电子科技集团公司第五十四研究所 | Power modulation filter frequency calibration device |
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| Publication number | Publication date |
|---|---|
| CN101667816A (en) | 2010-03-10 |
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Granted publication date: 20120509 Termination date: 20170914 |
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