CN106788301A - The gain electrically tunable filter and its communicator of VHF/UHF frequency ranges - Google Patents
The gain electrically tunable filter and its communicator of VHF/UHF frequency ranges Download PDFInfo
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- CN106788301A CN106788301A CN201611269683.6A CN201611269683A CN106788301A CN 106788301 A CN106788301 A CN 106788301A CN 201611269683 A CN201611269683 A CN 201611269683A CN 106788301 A CN106788301 A CN 106788301A
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
- H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
Abstract
The invention discloses a kind of gain electrically tunable filter of VHF/UHF frequency ranges, including：First resonant tank unit, second tune circuit units, the 3rd resonant tank unit and low-noise amplifier；The first resonant tank unit is used to obtain radiofrequency signal, and pre- frequency-selecting is carried out to the radiofrequency signal, obtain the radiofrequency signal comprising pre-selected frequency, then the radiofrequency signal comprising pre-selected frequency is sent to low-noise amplifier carries out low noise amplification, obtain the radiofrequency signal comprising pre-selected frequency after low noise is amplified, and the radiofrequency signal comprising pre-selected frequency after the low noise is amplified sends the double tunning network constituted to second tune circuit units and the 3rd resonant tank unit and carries out secondary frequency-selecting, the low noise for obtaining gain controllable amplifies radiofrequency signal；Wherein, low noise amplification each self-contained frequency of radiofrequency signal of the radiofrequency signal and the gain controllable belongs to VHF/UHF communications bands.
Description
Technical field
The invention belongs to very high frequency(VHF) (Very High Frequency, VHF)/superfrequency (Ultra High
Frequency, VHF)/communications band technical field of communication equipment, more particularly to a kind of VHF/UHF frequency ranges gain electricity adjust filter
Ripple device and its communicator, it is adaptable to band logical electrically regulated filtering of the receiving device front end in VHF/UHF frequency ranges.
Background technology
Very high frequency(VHF) (Very high frequency, VHF) refers to radiobeam of the frequency band by 30MHz to 300MHz；
VHF majorities are used as radio station and television station broadcast, while being again the communication channel of aviation and navigation, mainly make the biography compared with short distance
Send；With unlike high frequency (HF), the ionosphere of VHF will not generally reflect the signal of VHF, and VHF usually can by environment because
Element is (such as:Landform) influence its signal.
Superfrequency (Ultra High Frequency, UHF) refers to frequency for 300 to 3000MHz, wavelength in 1m to 1dm
Between radio wave, the radio wave of ultrahigh frequency band is also called decimetric wave, and the radio wave of ultrahigh frequency band is usually used in
Field of broadcast televisions, while the electric wave of ultrahigh frequency band can be received and dispatched with small and short antenna, is adapted to mobile communication, for example：
Military aviation wireless phone：(800MHz, 1.5GHz)；Wireless network：(2.4GHz)；Ham radio：(430MHz,
1200MHz, 2400MHz).
With continuing to develop for the communication technology, the communication frequency resource of VHF/UHF frequency ranges is at full stretch, ambient noise is multiple
It is miscellaneous, adjacent channel occurs on areal or same vehicle while situation about being communicated, channel is done between causing communication equipment
Disturb, this is accomplished by, and the design choice in the channel hardware of these communication equipments is good, changeable frequency electrically tunable filter frequency-selector
Part；Received the electrically tunable filter that used of channel in the past to be all made up of single double tuned circuit, using changing varactor
Reverse bias voltage control the gating frequency of bandpass filter, to realize receiving and gate the outer nothing of useful signal, attenuation band in channel
With the effect of signal；The low-noise amplifier (LNA) of channel is received if be placed in after electrically tunable filter, it is possible to achieve receive letter
Number amplify, but because the insertion loss of electrically tunable filter is big, can cause to receive that noise coefficient is excessive, influence communication equipment it is sensitive
Degree；If by low-noise amplifier (LNA) as electrically tunable filter before, receive signal then without frequency-selecting, even if front end has electricity
The filter with low insertion loss bandpass filter that sense and capacitor combination are built is processed with outer garbage signal, it is also difficult to which processing adjacent channel strong jamming makes
The problem of channel saturation, and then influence is produced on the reception device in communication equipment.
The content of the invention
For the deficiency that above prior art is present, it is an object of the invention to propose a kind of gain of VHF/UHF frequency ranges
3 resonant tank units that the gain electrically tunable filter of electrically tunable filter and its communicator, wherein VHF/UHF frequency ranges is used and
Low-noise amplifier (LNA) small volume, frequency selectivity are more preferably and with certain gain；Resonant tank is widely used in frequency selection circuit
In, the resonant tank unit that the present invention is used includes 3 resonant tank units, and the first resonant tank unit, second are designated as successively
Resonant tank unit and the 3rd resonant tank unit, the first resonant tank are pre- frequency-selecting, and selecting frequency characteristic is general, pass band insertion loss
It is small；Second tune loop and the 3rd resonant tank composition double tunning network, selecting frequency characteristic are good, and pass band insertion loss is big；And low noise
Acoustic amplifier (LNA) is placed between the first resonant tank unit and second tune circuit units, it is possible to increase of the present invention
The gain of the gain electrically tunable filter of VHF/UHF frequency ranges so that gain controllable, so as to improve the dynamic range of reception device, changes
The noise coefficient of communicator where kind reception device；Increasing by first switch and second switch to multiple VHF/UHF frequency ranges
Beneficial electrically tunable filter is gated respectively, and the gain electrically tunable filter of VHF/UHF frequency ranges of the present invention can be realized wider
The covering of frequency range.
To realize above-mentioned technical purpose, the present invention is adopted the following technical scheme that and is achieved.
Technical scheme one：
A kind of gain electrically tunable filter of VHF/UHF frequency ranges, including：First resonant tank unit, double tunning network and low
Noise amplifier；The double tunning network includes second tune circuit units and the 3rd resonant tank unit；First tuning
The signal output part of circuit units electrically connects the signal input part of low-noise amplifier, the signal output part electricity of low-noise amplifier
The signal input part of second tune circuit units is connected, the signal output part electrical connection the 3rd of second tune circuit units is tuned back to
The signal input part of road unit；The second tune circuit units and the 3rd resonant tank unit composition double tunning network；
The first resonant tank unit is used to obtain radiofrequency signal, and carries out pre- frequency-selecting to the radiofrequency signal, obtains
Radiofrequency signal comprising pre-selected frequency, then sending to low-noise amplifier the radiofrequency signal comprising pre-selected frequency is carried out
Low noise amplify, obtain low noise amplify after the radiofrequency signal comprising pre-selected frequency, and by the low noise amplify after comprising pre-selection
The radiofrequency signal of frequency sends to double tunning network and carries out secondary frequency-selecting, and the low noise for obtaining gain controllable amplifies radiofrequency signal；Its
In, low noise amplification each self-contained frequency of radiofrequency signal of the radiofrequency signal and the gain controllable belongs to VHF/UHF and leads to
Letter frequency range.
Technical scheme two：
A kind of communicator of the gain electrically tunable filter of VHF/UHF frequency ranges, based on the VHF/UHF described in technical scheme one
The gain electrically tunable filter of frequency range, including first switch, second switch, m VHF/UHF frequency range gain electrically tunable filter；Its
Each signal input part corresponds to the public defeated of electrical connection first switch to the gain electrically tunable filter of middle m VHF/UHF frequency ranges respectively
Go out end, and the gain electrically tunable filter of public output correspondence i-th VHF/UHF frequency range of electrical connection of the first switch is input into
End, i-th public input of the gain electrically tunable filter output end correspondence electrical connection second switch of VHF/UHF frequency ranges；Wherein,
I belongs to 1 to m, and i-th gain electrically tunable filter of VHF/UHF frequency ranges is in the m gain electrically tunable filter of VHF/UHF frequency ranges
Any one, m is the integer more than 0.
The first switch is used to obtain radiofrequency signal, then one VHF/ of frequency correspondence gating according to the radiofrequency signal
The gain electrically tunable filter of uhf band, the gain electrically tunable filter of the VHF/UHF frequency ranges of gating is carried out successively to the radiofrequency signal
Pre- frequency-selecting, low noise are amplified and secondary frequency-selecting, and the low noise for obtaining gain controllable amplifies radiofrequency signal, and by the low of the gain controllable
Amplification radiofrequency signal of making an uproar sends to second switch and is exported.
It is in place of further improvement of the present invention：
First, the first resonant tank unit, second tune circuit units, the 3rd resonant tank unit and low noise are put
It is electrically connected using cascade between big device；
Second, the first resonant tank unit, second tune circuit units, the 3rd resonant tank unit are respectively electricity
Hold, varactor and inductance are constituted.
3rd, the gain electrically tunable filter based on VHF/UHF frequency ranges also includes controller, and the voltage of controller is controlled
Output end is electrically connected the control voltage input of the gain electrically tunable filter of each VHF/UHF frequency range, the letter of controller
Number control output end is electrically connected the signal control of the first switch in the gain electrically tunable filter of each VHF/UHF frequency range
The signal control signal of input and second switch；Controller is used to control respectively the gain electricity of each VHF/UHF frequency range
Tunable filter obtains control voltage, is additionally operable to obtain first switch control signal and second switch control signal, and correspondence control
First switch and second switch are filtered frequency-selecting.
Beneficial effects of the present invention are：A kind of gain electrically tunable filter of VHF/UHF frequency ranges of the invention use first
Resonant tank unit, the small volume of second tune circuit units and the 3rd resonant tank unit and low-noise amplifier, frequency choosing
Selecting property is more preferably and with certain gain；First resonant tank unit is pre- frequency-selecting, and selecting frequency characteristic is general, and pass band insertion loss is small；The
Two resonant tank units and the 3rd resonant tank unit composition double tunning network selecting frequency characteristic are good, and pass band insertion loss is big；And it is low
Noise amplifier is placed between the first resonant tank unit and second tune circuit units, it is possible to increase VHF/ of the present invention
The gain of the gain electrically tunable filter of uhf band so that gain controllable, so as to improve the dynamic range of reception device, improvement connects
The noise coefficient of communicator where receiving apparatus；The gain electrically tunable filter communicator of VHF/UHF frequency ranges of the invention passes through
First switch and second switch are gated respectively to the gain electrically tunable filter of multiple VHF/UHF frequency ranges, can realize this hair
The gain electrically tunable filter of the bright VHF/UHF frequency ranges solves to believe in VHF/UHF band communication equipment in the covering of more wide-band
The problem of road frequency-selecting, realizes that receiving front end electrically tunable filter using the VHF/UHF frequency ranges with gain carries out frequency-selecting, additionally it is possible to which raising connects
Receipts machine ground dynamic range, accomplishes gain controllable, and can preferably improve noise coefficient, improves communicator sensitivity, than
The structure and index low-noise amplifier being placed in before or after wave filter are more excellent.
Brief description of the drawings
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is a kind of principle schematic of the gain electrically tunable filter of VHF/UHF frequency ranges of the invention；
Fig. 2 is a kind of general structure schematic diagram of the gain electrically tunable filter communicator of VHF/UHF frequency ranges of the invention；
Fig. 3 is a kind of implementation of the communicator internal controller of the gain electrically tunable filter of VHF/UHF frequency ranges of the invention
Schematic diagram.
Specific embodiment
Reference picture 1, is a kind of principle schematic of the gain electrically tunable filter of VHF/UHF frequency ranges of the invention；This kind
The gain electrically tunable filter of VHF/UHF frequency ranges includes：First resonant tank unit, second tune circuit units, the 3rd tune back to
Road unit and low-noise amplifier (LNA)；The first resonant tank unit, second tune circuit units, the 3rd resonant tank
Unit is made up of electric capacity, varactor, inductance respectively；The first resonant tank unit output end electrically connects low noise amplification
Device (LNA) input, low-noise amplifier (LNA) output end electrical connection second tune circuit units input, second tune is returned
Road unit output end electrically connects the 3rd resonant tank unit input；The second tune circuit units and the 3rd resonant tank list
Tuple tuning network in pairs.
The low-noise amplifier is integrated low-noise amplifier (LNA), and the low-noise amplifier should select suitable answering
With frequency, the isoparametric device of noise coefficient and multiplication factor of design requirement is met, according to the times magnification of low-noise amplifier
Number realizes gain controllable, and then selects the low-noise amplifier with automatic growth control (AGC) to realize dynamic gain control；
And first can be improved between resonant tank unit and second tune circuit units resonant tank using low-noise amplifier (LNA)
Reception gain, improvement noise coefficient, are applied to communication equipment more and receive signal front end, and logical in VHF/UHF by parallel way
Letter frequency range realizes that wide-band electrically tunable filter is designed.
The first resonant tank unit is used to obtain radiofrequency signal, and carries out pre- frequency-selecting to the radiofrequency signal, obtains
Radiofrequency signal comprising pre-selected frequency, then sending to low-noise amplifier the radiofrequency signal comprising pre-selected frequency is carried out
Low noise amplify, obtain low noise amplify after the radiofrequency signal comprising pre-selected frequency, and by the low noise amplify after comprising pre-selection
The radiofrequency signal of frequency sends the double tunning network constituted to second tune circuit units and the 3rd resonant tank unit and carries out square
Shape coefficient secondary frequency-selecting higher, the low noise for obtaining gain controllable amplifies radiofrequency signal；Wherein, the radiofrequency signal and the increasing
The controllable low noise of benefit is amplified each self-contained frequency of radiofrequency signal and belongs to VHF/UHF communications bands.
The first resonant tank unit, second tune circuit units, the 3rd resonant tank unit and low-noise amplifier
(LNA) it is electrically connected using cascade between；The gain electrically tunable filter of the VHF/UHF frequency ranges is a dual-port net
Network, comprising 2 prevention at radio-frequency port, respectively rf input port and radio frequency delivery outlet；After rf input port electrical connection coupled capacitor C1
The resonant tank 1 that electrical connection is made up of varactor V1, varactor V2 and Q inductance L1 high and Q inductance L2 high, will tune
Loop 1 is used as the first resonant tank unit；Low-noise amplifier is electrically connected after varactor V1 electrical connection coupled capacitors C2
(LNA), by varactor V3, varactor V4 and Q high after low-noise amplifier (LNA) electrical connection connection coupled capacitor C3
The resonant tank 2 of inductance L4 compositions, using resonant tank 2 as second tune circuit units；Varactor V3 is via Q inductance high
The resonant tank 3 that L3 electrical connections are made up of Q inductance L5 high, Q inductance L6 high, varactor V5 and varactor V6, will adjust
Humorous loop 3 is used as the 3rd resonant tank unit；First resonant tank unit, second tune circuit units and the 3rd resonant tank list
The respective circuit-mode of unit is essentially the same, and each of which device value can be different according to the frequency range of design.First
Resonant tank unit output end electrically connects low-noise amplifier (LNA) input, low-noise amplifier by coupled capacitor C2
(LNA) a kind of gain electrically tunable filter of VHF/UHF frequency ranges of the invention is needed from type and the difference such as fixed, adjustable
The device of the indexs such as noise coefficient, compression point；Low-noise amplifier (LNA) includes control circuit and power-up circuit.
Connected by varactor V3 after the coupled electric capacity C3 electrical connections of low-noise amplifier (LNA) output end, become
Connected by transfiguration after holding the second tune circuit units of diode V4 and Q inductance L4 high compositions, then coupled inductance L3 electrical connections
3rd resonant tank unit of diode V5, varactor V6, Q inductance L5 high and Q inductance L6 high composition, last coupled electricity
Hold C4 and radio frequency delivery outlet is electrically connected；Second tune circuit units and the 3rd resonant tank unit composition double tunning network,
Each device value in double tunning network can be different according to the frequency range of design；VCC1 is used for varactor
V1, varactor V2 add backward voltage respectively, and VCC2 for adding reverse electricity respectively to varactor V3, varactor V4
Pressure, VCC3 is used to add backward voltage respectively to varactor V5, varactor V6, and backward voltage is all malleation.
The first resonant tank unit, second tune circuit units, the 3rd resonant tank unit are respectively electric capacity, transfiguration
Diode and inductance are constituted, by taking the first resonant tank unit as an example, the first resonant tank unit input electrical connection coupling Q electricity high
Hold C1, then electrically connect the first tuning circuit, be eventually connected to the output end of the first resonant tank unit, wherein the first tuning electricity
The variable capacitance group Q inductance high in parallel of route varactor V1, varactor V2 series connection (V1, V2 negative pole connection altogether) composition
L is constituted, and Q inductance L high in parallel is in series by Q inductance L1 high and Q inductance L2 high, the end ground connection of the first tuning circuit.Second
In resonant tank unit variable capacitance is constituted with by varactor V3, varactor V4 series connection (negative pole is connected altogether for V3, V4)
Group Q inductance high in parallel is L4, is connected (V5, V6 with by varactor V5, varactor V6 in the 3rd resonant tank unit
Negative pole connection altogether) variable capacitance group Q inductance high in parallel is constituted for Q inductance L5 high and Q inductance L6 high connects；Wherein, Q high is exactly
High quality factor, Q values more high-quality is better, more ideal component；Selection electric capacity and inductance Q values be not both because of frequency it is different,
Q high be relative to the relative value of general device, can select it is high just select high, such index can be more preferable, closer to theoretical value.
Why the high Q inductance in parallel with variable capacitance group is divided into two Q inductance high to connect, allows for impedance
Match somebody with somebody.Certainly, designer can determine whether from one according to the adjusting range of tuned frequency and the capister of selection
Or multiple varactors constitute variable capacitance group；VCC1 in Fig. 1 is to varactor V1, varactor V2 point
Not plus backward voltage input, the backward voltage is malleation, according to the alive different varactor V1 of institute, the pole of transfiguration two
Pipe V1 is presented different electric capacity respectively.It is right to be realized in the input port of VCC1 one inductance of concatenation or resistance in actual applications
First resonant tank unit is intercepted when obtaining radiofrequency signal, if necessary, it is necessary to be filtered place to the DC voltage of VCC1
Reason, such as add electric capacity, magnetic bead, electromagnetic interface filter etc..
Reference picture 2, is that a kind of general structure of the gain electrically tunable filter communicator of VHF/UHF frequency ranges of the invention is shown
It is intended to；Fig. 2 is a kind of extension of Fig. 1, and the gain electrically tunable filter of a VHF/UHF frequency range shown in Fig. 1 can not cover wider
Frequency range, the purpose of wide-band filtering is met to reach, the present invention is logical using the gain electrically tunable filter of VHF/UHF frequency ranges
T unit realizes that the communicator of the gain electrically tunable filter of the VHF/UHF frequency ranges is taken by first switch K1, second switch
The mode that the gain electrically tunable filter of K2 and m VHF/UHF frequency range is gated realizes, wherein m increasing of VHF/UHF frequency ranges
Beneficial electrically tunable filter each signal input part respectively correspond to electrical connection first switch public output, and the first switch public affairs
Output end correspondence electrically connects i-th gain electrically tunable filter input of VHF/UHF frequency ranges, i-th increasing of VHF/UHF frequency ranges altogether
The public input of beneficial electrically tunable filter output end correspondence electrical connection second switch；Wherein, i belongs to 1 to m, i-th VHF/UHF
The gain electrically tunable filter of frequency range is any one in the m gain electrically tunable filter of VHF/UHF frequency ranges, and m is whole more than 0
Number；M=3 in the embodiment of the present invention.
The gain electrically tunable filter of the m VHF/UHF frequency ranges each has different gating frequencies；Each VHF/
The gain electrically tunable filter of uhf band is all comprising rf inputs mouthful and radio frequency output port；The first switch is used to obtain
Radiofrequency signal, then the frequency correspondence one gain electrically tunable filter of VHF/UHF frequency ranges of gating according to the radiofrequency signal, gates
VHF/UHF frequency ranges gain electrically tunable filter the radiofrequency signal is carried out successively pre- frequency-selecting, low noise amplify, squareness factor it is higher
Secondary frequency-selecting, the low noise for obtaining gain controllable amplifies radiofrequency signal, and the low noise of the gain controllable is amplified into radiofrequency signal
Send to the second switch changed with first switch simultaneously and exported.
Fig. 2 is example when m is 3, and the frequency according to the radiofrequency signal for obtaining controls first switch K1, second switch respectively
K2, has gated the gain electrically tunable filter (BPF1) of a VHF/UHF frequency ranges, the gain electrically regulated filtering of the 2nd VHF/UHF frequency ranges
The gain electrically tunable filter (BPF3) of device (BPF2) and the 3rd VHF/UHF frequency ranges is all not gated；BPF1, BPF2, BPF3 are respective
Same position corresponding voltage VCC1, VCC2, VCC3 are electrically connected together；It is each self-contained in BPF1, BPF2, BPF3
Low-noise amplifier LNA for power saving, only gate corresponding frequencies when the radiofrequency signal in the range of the band frequency is added
Electricity and other controls；Other are controlled to：According to working frequency gate certain all the way electrically tunable filter when, to the low noise included in the road
Acoustic amplifier LNA is powered up, if the low-noise amplifier pin has other such as AGC to control input control signal, also to be sent
Corresponding control signal；In the embodiment of the present invention, first switch K1, second switch K2 are respectively adopted IGCT, PIN and switch two poles
Pipe, relay or electronic switch IC chip；In order to reach the requirement of radio station frequency hopping hop rate recommend PIN switching diodes or
Electronic switch IC chip.
Also comprising control in a kind of communication device embodiment of the gain electrically tunable filter of VHF/UHF frequency ranges of the invention
Device, the voltage control output end of the controller is electrically connected the control of the gain electrically tunable filter of each VHF/UHF frequency range
Voltage input end processed, the signal control output end of controller is electrically connected the gain electrically regulated filtering of each VHF/UHF frequency range
The signal control signal of the first switch in device and the signal control signal of second switch；Controller is used to press input service
Frequency correspondence output controls the gain electrically tunable filter of each VHF/UHF frequency range to obtain required voltage respectively, is additionally operable to obtain
First switch control signal and second switch control signal, and correspondence control first switch and second switch are filtered frequency-selecting.
Reference picture 3, is a kind of communicator internal controller of the gain electrically tunable filter of VHF/UHF frequency ranges of the invention
Implement schematic diagram；A total of 4 tunnel input signal of controller, respectively frequency word, frequency signal, enable, clock are changed, output letter
Number include respectively control the first VHF/UHF frequency ranges gain electrically tunable filter in be used for varactor V1, varactor
V2 add respectively backward voltage VCC1, control the 2nd VHF/UHF frequency ranges gain electrically tunable filter in varactor V3, become
Hold during diode V4 adds backward voltage VCC2, and the gain electrically tunable filter of the 3rd VHF/UHF frequency ranges of control respectively and give transfiguration
Diode V3, varactor V4 add backward voltage VCC3, first switch control signal KZ1 and second switch control signal respectively
KZ2.Operation principle is that radiofrequency signal of the radio station by being input into obtains the frequency and working condition that are currently needed for work, according to described
The frequency and working condition for being currently needed for work control first switch K1 and second switch K2, first switch control signal respectively
KZ1 is the signal for controlling first switch K1, and second switch control signal KZ2 is the signal for controlling second switch K2, first switch
Control signal KZ1 and second switch control signal KZ2 can be single RF signal or multi-channel rf signal, or string
Row data or parallel data；Selected from first switch K1 and the respective types of second switch K2 according in implementation；Gating
The gain electrically tunable filter of VHF/UHF frequency ranges afterwards will be stored in the working frequency in controller according to radio station working frequency difference
Corresponding one group of voltage VCC1, VCC2, VCC3 are continued to output respectively, and control the gain electricity of the VHF/UHF frequency ranges of the gating to adjust
Wave filter is filtered frequency-selecting treatment to the frequency signal.
Obviously, those skilled in the art can carry out various changes and modification without deviating from essence of the invention to the present invention
God and scope.So, if these modifications of the invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising these changes and modification.
Claims (7)
1. a kind of gain electrically tunable filter of VHF/UHF frequency ranges, it is characterised in that including：First resonant tank unit, double tunning
Network and low-noise amplifier；
The double tunning network includes second tune circuit units and the 3rd resonant tank unit；The first resonant tank unit
Signal output part electrically connect low-noise amplifier signal input part, low-noise amplifier signal output part electrical connection second
The signal input part of resonant tank unit, the signal output part of second tune circuit units electrically connects the 3rd resonant tank unit
Signal input part；The second tune circuit units and the 3rd resonant tank unit composition double tunning network.
2. a kind of gain electrically tunable filter of VHF/UHF frequency ranges as claimed in claim 1, it is characterised in that described first adjusts
Humorous circuit units are used to obtain radiofrequency signal, and carry out pre- frequency-selecting to the radiofrequency signal, obtain the radio frequency comprising pre-selected frequency
Signal, then sending to low-noise amplifier the radiofrequency signal comprising pre-selected frequency carries out low noise amplification, obtains low noise
The radiofrequency signal comprising pre-selected frequency after amplification, and the radiofrequency signal comprising pre-selected frequency after low noise amplification is sent
Secondary frequency-selecting is carried out to double tunning network, the low noise for obtaining gain controllable amplifies radiofrequency signal；Wherein, the radiofrequency signal and institute
The low noise amplification each self-contained frequency of radiofrequency signal for stating gain controllable belongs to VHF/UHF communications bands.
3. a kind of gain electrically tunable filter of VHF/UHF frequency ranges as claimed in claim 1, it is characterised in that described first adjusts
Entered using cascade between humorous circuit units, second tune circuit units, the 3rd resonant tank unit and low-noise amplifier
Row electrical connection.
4. a kind of gain electrically tunable filter of VHF/UHF frequency ranges as claimed in claim 1, it is characterised in that described first adjusts
Humorous circuit units, second tune circuit units, the 3rd resonant tank unit are respectively electric capacity, varactor and inductance composition.
5. a kind of communicator of the gain electrically tunable filter of VHF/UHF frequency ranges, based on any one right of Claims 1-4
It is required that the gain electrically tunable filter of described VHF/UHF frequency ranges, it is characterised in that individual including first switch, second switch, m
The gain electrically tunable filter of VHF/UHF frequency ranges；The respective signal input part of wherein m gain electrically tunable filter of VHF/UHF frequency ranges
The public output of electrical connection first switch is corresponded to respectively, and the public output correspondence of the first switch is electrically connected i-th
The gain electrically tunable filter input of VHF/UHF frequency ranges, i-th gain electrically tunable filter output end correspondence of VHF/UHF frequency ranges
Electrically connect the public input of second switch；Wherein, i belongs to 1 to m, and i-th gain electrically tunable filter of VHF/UHF frequency ranges is m
In the gain electrically tunable filter of individual VHF/UHF frequency ranges any one, m is the integer more than 0；
The first switch is used to obtain radiofrequency signal, then one VHF/UHF of frequency correspondence gating according to the radiofrequency signal
The gain electrically tunable filter of frequency range, the gain electrically tunable filter of the VHF/UHF frequency ranges of gating carries out pre- successively to the radiofrequency signal
Frequency-selecting, low noise are amplified, secondary frequency-selecting, and the low noise for obtaining gain controllable amplifies radiofrequency signal, and by the low noise of the gain controllable
Amplification radiofrequency signal sends to second switch and is exported.
6. a kind of communicator of the gain electrically tunable filter of VHF/UHF frequency ranges as claimed in claim 5, it is characterised in that
The communicator of the gain electrically tunable filter of the VHF/UHF frequency ranges also includes controller, the voltage control output end of controller
It is electrically connected the control voltage input of the gain electrically tunable filter of each VHF/UHF frequency range, the signal control of controller
Output end is electrically connected the signal control signal of the first switch in the gain electrically tunable filter of each VHF/UHF frequency range
With the signal control signal of second switch；Controller is used to control respectively the gain electrically regulated filtering of each VHF/UHF frequency range
Device obtains control voltage, is additionally operable to obtain first switch control signal and second switch control signal, and correspondence control first is opened
Close and second switch is filtered frequency-selecting.
7. a kind of communicator of the gain electrically tunable filter of VHF/UHF frequency ranges as claimed in claim 5, it is characterised in that
The first switch K1 and second switch K2 are respectively IGCT, PIN switching diodes, relay or electronic switch IC chip
In any one.
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| CN201611269683.6A CN106788301A (en) | 2016-12-30 | 2016-12-30 | The gain electrically tunable filter and its communicator of VHF/UHF frequency ranges |
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| CN201611269683.6A CN106788301A (en) | 2016-12-30 | 2016-12-30 | The gain electrically tunable filter and its communicator of VHF/UHF frequency ranges |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108173529A (en) * | 2017-12-20 | 2018-06-15 | 北京遥感设备研究所 | A kind of ultra-wide band radio-frequency electric tuning filter network |
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