CN206313737U - L-band down converter - Google Patents
L-band down converter Download PDFInfo
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- CN206313737U CN206313737U CN201621453831.5U CN201621453831U CN206313737U CN 206313737 U CN206313737 U CN 206313737U CN 201621453831 U CN201621453831 U CN 201621453831U CN 206313737 U CN206313737 U CN 206313737U
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Abstract
The utility model is related to a kind of L-band down converter, including：Wave filter, the first frequency mixer, the first intermediate-frequency filter, the second frequency mixer, the first intermediate frequency amplifier, intermediate frequency temperature compensation attenuator, the second intermediate frequency amplifier and the second intermediate-frequency filter；The input of wave filter connects the L-band signal output part of satellite system, the output end of wave filter connects the first input end of the first frequency mixer, the output end of the first frequency mixer connects the input of the first intermediate-frequency filter, the output end of the first intermediate-frequency filter connects the first input end of the second frequency mixer, the output end of the second frequency mixer connects the input of the first intermediate frequency amplifier, the output end of the first intermediate frequency amplifier connects the input of intermediate frequency temperature compensation attenuator, the output end of intermediate frequency temperature compensation attenuator connects the input of the second intermediate frequency amplifier, the output end of the second intermediate frequency amplifier connects the input of the second intermediate-frequency filter；Second input of the first frequency mixer and the second input of the second frequency mixer respectively connect local oscillation signal all the way.
Description
Technical field
The utility model is related to converter technology field, more particularly to a kind of L-band down converter.
Background technology
Satellite communication system has become realization due to the advantage such as its area coverage is big, communication band is wide, transmission capacity is big
The important means of communication.Preferably service can be provided for multiple communication services.L-band frequency converter is used as must in satellite downlink
Indispensable down-converter unit, plays a part of for L-band frequency spectrum to change to intermediate frequency in satellite communication or spectrum monitoring.
Heterodyne architecture is used current existing L-band frequency converter more, by double conversion, frequency spectrum being down-converted to needs
Intermediate frequency after export, side circuit design in, due to the characteristic of device, there is thermal adaptability in existing L-band frequency converter
Poor shortcoming.
Utility model content
Based on this, it is necessary to for the problem of thermal adaptability difference, there is provided a kind of L-band down converter.
A kind of L-band down converter, including：
Wave filter, the first frequency mixer, the first intermediate-frequency filter, the second frequency mixer, the first intermediate frequency amplifier, intermediate frequency temperature compensation decline
Subtract device, the second intermediate frequency amplifier and the second intermediate-frequency filter；
The input of the wave filter connects the L-band signal output part of satellite system, and the output end of the wave filter connects
The first input end of first frequency mixer is connect, the output end of first frequency mixer connects the defeated of first intermediate-frequency filter
Enter end, the output end of first intermediate-frequency filter connects the first input end of second frequency mixer, second frequency mixer
Output end connect the input of first intermediate frequency amplifier, the output end of first intermediate frequency amplifier connects the intermediate frequency
The input of temperature compensation attenuator, the output end of the intermediate frequency temperature compensation attenuator connects the input of second intermediate frequency amplifier,
The output end of second intermediate frequency amplifier connects the input of second intermediate-frequency filter, second intermediate-frequency filter
Output end exports intermediate-freuqncy signal；Second input of first frequency mixer connects the first local oscillator signal output part, described second
Second input of frequency mixer connects the second local oscillation signal output end.
Above-mentioned L-band down converter, by setting intermediate frequency temperature between the first intermediate frequency amplifier and the second intermediate frequency amplifier
Mend attenuator, can direct aware circuit temperature change, it is easy to the temperature characterisitic of real-Time Compensation power, thermal adaptability compared with
It is good.And intermediate frequency temperature compensation attenuator is arranged between cascade amplifier, and buffer action, Neng Gouyou are played to adjacent dual-stage amplifier
Effect prevents amplifier self-excitation.
Brief description of the drawings
Fig. 1 is the structural representation of the L-band down converter of one embodiment；
Fig. 2 is the temperature compensation attenuator application principle schematic diagram of one embodiment；
Fig. 3 is the CMF44C845C30A type dielectric filter index schematic diagrames of one embodiment.
Specific embodiment
The technical solution of the utility model is illustrated below in conjunction with the accompanying drawings.
As shown in figure 1, the utility model provides a kind of L-band down converter, it may include：
Wave filter 101, the first frequency mixer 102, the first intermediate-frequency filter 103, the second frequency mixer 104, the first intermediate frequency amplify
Device 105, intermediate frequency temperature compensation attenuator 106, the second intermediate frequency amplifier 107 and the second intermediate-frequency filter 108；
The input of the wave filter 101 connects the L-band signal output part of satellite system, the wave filter 101 it is defeated
Go out the first input end of end connection first frequency mixer 102, in the output end connection described first of first frequency mixer 102
The input of frequency wave filter 103, the output end of first intermediate-frequency filter 103 connects the first of second frequency mixer 104
Input, the output end of second frequency mixer 104 connects the input of first intermediate frequency amplifier 105, in described first
The output end of audio amplifier 105 connects the input of the intermediate frequency temperature compensation attenuator 106, the intermediate frequency temperature compensation attenuator 106
Output end connects the input of second intermediate frequency amplifier 107, and the output end connection of second intermediate frequency amplifier 107 is described
The input of the second intermediate-frequency filter 108, the output end output intermediate-freuqncy signal of second intermediate-frequency filter 108；Described first
Second input of frequency mixer 102 connects the first local oscillation signal, and the second input of second frequency mixer 104 connects second
Shake signal.
The wave filter 101 can be high frequency filter, and its effect is that the signal beyond L-band input signal frequency range is entered
Row filtering.The first input end of first frequency mixer 102 accesses filtered L-band signal, first frequency mixer 102
Second input access the first local oscillator signal output part, by the first local oscillator signal output part export the first local oscillation signal with
L-band signal is mixed, and obtains the first intermediate-freuqncy signal.First frequency mixer 102 exports in first first intermediate-freuqncy signal
Frequency wave filter 103 is filtered.Filtered first intermediate-freuqncy signal exports the first input end to the second frequency mixer 104, second
Second input of frequency mixer 104 connects the second local oscillation signal output end, second frequency mixer 104 by the first intermediate-freuqncy signal with
Second local oscillation signal of the second local oscillation signal output end output is mixed, and obtains the second intermediate-freuqncy signal, and the second intermediate frequency is believed
Number output is amplified to the first intermediate frequency amplifier 105.Wherein, the first local oscillation signal and the second local oscillation signal can respectively by first
Local oscillator and the second local oscillator are produced.First intermediate frequency amplifier 105 by amplification after the second intermediate-freuqncy signal export to
Intermediate frequency temperature compensation attenuator 106, the detection temperature value of intermediate frequency temperature compensation attenuator 106, believes the second intermediate frequency according to the temperature value for detecting
Number decayed, by decay after the second intermediate-freuqncy signal export to the second intermediate frequency amplifier 107 and be amplified, then export to second
Intermediate-frequency filter 108 is filtered.With the rising of temperature, the attenuation reduction of the temperature compensation attenuator, compensation is raised with temperature
The variable quantity that amplifier gain reduces, reaches the constant purpose of whole down coversion channel gain.
The utility model realizes down coversion scheme using superhet double conversion mode, considers when side circuit is designed
Influence to temperature to amplifier can cause the channel gain to have certain change, in order to ensure the uniformity of gain, in hardware electricity
Temperature compensation attenuator, influence of the compensation temperature to amplifier, compared to more conventionally employed ALC (Automatic are employed in road
Level Control, auto level control) there is advantages below：
(1) in circuit can direct aware circuit temperature change, it is easy to the temperature characterisitic of real-Time Compensation power；
(2) used between cascade amplifier, buffer action is played to adjacent dual-stage amplifier, effectively prevent amplifier certainly
Swash；
(3) temperature compensation attenuator belongs to passive device in itself, undistorted, without phase shift and time delay；
Shown in the application principle schematic diagram 2 of temperature compensation attenuator.
In order to meet requirement of the rear class signal monitoring to inband flatness uniformity, the first intermediate frequency band logical in circuit design
Wave filter is realized using the passband fluctuation dielectric filter of good performance of customization, it is preferable that the dielectric filter can be
CMF44C845C30A type dielectric filters.The device passband fluctuation has very big advantage, passband fluctuation compared to SAW filter
Can reach in 0.5dB.Specific targets parameter is shown in as shown in Figure 3.
By the test of actual module, demonstrate temperature compensation attenuator has good temperature-compensating to L low-converters
Effect, increased temperature compensation attenuator can make L-band down converter under -20 DEG C~+55 DEG C of environment temperature, module
Change in gain amount is dropped in 0.5dB by original 1.5dB, improves the performance indications of L-band down converter.Using dielectric filter
Device makes passband fluctuation have original 1.5dB fluctuations to be reduced to 0.8dB, and the interior wave band performance of band that improve L-band down converter refers to
Mark.
In one embodiment, the L-band down converter may also include be sequentially connected the first numerical-control attenuator 109,
First high-frequency amplifier 110, the second numerical-control attenuator 111 and the second high-frequency amplifier 112；First numerical-control attenuator 109
Input connect the L-band signal output part of satellite system, the output end of second high-frequency amplifier 112 connects the filter
Ripple device 101.In one embodiment, the L-band down converter may also include control unit；The enable of described control unit is defeated
Go out end respectively with the enable control end and the enable control end phase of the second numerical-control attenuator 111 of first numerical-control attenuator 109
Connection.Described control unit can be controlled to the attenuation of the numerical-control attenuator 111 of first numerical-control attenuator 109 and second
System.When the L-band signal of input is smaller, the first numerical-control attenuator 109 and the second numerical-control attenuator 111 can be controlled to and do not waned
Subtract state, L-band signal is amplified only with the first high-frequency amplifier 110 and the second high-frequency amplifier 112；When input
When L-band signal is larger, in order to the signal for ensureing passage is undistorted, amplify again after first can decaying to signal, it is ensured that signal
The normal work of path.
In one embodiment, the L-band down converter may also include power splitter 113 and wave detector 114；The work(point
The input of device 113 connects the L-band signal output part of satellite system, and the output end of the power splitter 113 is respectively with described the
The signal input part of one numerical-control attenuator 109 is connected with the signal input part of wave detector 114, the output of the wave detector 114
End is connected with the signal input part of described control unit.Power splitter 113 can be defeated by the L-band signal output part of satellite system
The L-band signal for going out is divided into two paths of signals, exports all the way to the first numerical-control attenuator 109, and another road is exported to wave detector 114,
Wave detector 114 carries out detection to L-band signal, and detection result is exported to control unit, and control unit can be according to the detection
The attenuation of output control the first numerical-control attenuator 109 and the second numerical-control attenuator 111.
In one embodiment, the L-band down converter may also include single-pole double-throw switch (SPDT) 115；The single-pole double throw
Switch 115 moved end be connected with the signal input part of power splitter 113, the enable input of the single-pole double-throw switch (SPDT) 115 and
The enable output end of described control unit is connected, the first not moved end and described control unit of the single-pole double-throw switch (SPDT) 115
Signal output part be connected, the single-pole double-throw switch (SPDT) 115 second not moved end connect satellite system L-band signal output
End.When the moved end of single-pole double-throw switch (SPDT) 115 connects the first not moved end, the L-band down converter normal work, when hilted broadsword is double
Throw switch 115 moved end connection second not moved end when, the L-band down converter enters row of channels self-inspection.During self-inspection, control unit
Exportable self-test signal is to the second not moved end of single-pole double-throw switch (SPDT) 115.
In one embodiment, can also respectively to connect first local oscillation signal defeated for the enable output end of described control unit
Go out end and the second local oscillation signal output end, the first local oscillator signal output part of control and the second local oscillation signal output end output correspondence frequency
The local oscillation signal of point, will receive signal and is down-converted to intermediate frequency 70MHz outputs.
The utility model has advantages below：
(1) channel environment temperature gain compensation is carried out using temperature compensation attenuator.
(2) temperature-compensating attenuator circuit realizes that performance is good than traditional alc circuit on circuit structure, circuit structure letter
It is single.
(3) first intermediate frequencies can preferably improve inband flatness using dielectric filter.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore can not be interpreted as the limitation to utility model patent scope.It should be pointed out that for the common skill of this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
Protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (8)
1. a kind of L-band down converter, it is characterised in that including：
Wave filter, the first frequency mixer, the first intermediate-frequency filter, the second frequency mixer, the first intermediate frequency amplifier, intermediate frequency temperature compensation decay
Device, the second intermediate frequency amplifier and the second intermediate-frequency filter；
The input of the wave filter connects the L-band signal output part of satellite system, the output end connection institute of the wave filter
The first input end of the first frequency mixer is stated, the output end of first frequency mixer connects the input of first intermediate-frequency filter
End, the output end of first intermediate-frequency filter connects the first input end of second frequency mixer, second frequency mixer
Output end connects the input of first intermediate frequency amplifier, and the output end of first intermediate frequency amplifier connects the intermediate frequency temperature
The input of attenuator is mended, the output end of the intermediate frequency temperature compensation attenuator connects the input of second intermediate frequency amplifier, institute
The output end for stating the second intermediate frequency amplifier connects the input of second intermediate-frequency filter, second intermediate-frequency filter it is defeated
Go out end output intermediate-freuqncy signal；Second input of first frequency mixer connects the first local oscillator signal output part, and described second mixes
Second input of frequency device connects the second local oscillation signal output end.
2. L-band down converter according to claim 1, it is characterised in that first intermediate-frequency filter is medium filter
Ripple device.
3. L-band down converter according to claim 2, it is characterised in that the dielectric filter is
CMF44C845C30A type dielectric filters.
4. L-band down converter according to claim 1, it is characterised in that also include：
The first numerical-control attenuator, the first high-frequency amplifier, the second numerical-control attenuator and the second high-frequency amplifier being sequentially connected；
The input of first numerical-control attenuator connects the L-band signal output part of satellite system, second High frequency amplification
The output end of device connects the wave filter.
5. L-band down converter according to claim 4, it is characterised in that also include：
Control unit；
The enable output end of described control unit declines with the enable control end of first numerical-control attenuator and the second numerical control respectively
The enable control end for subtracting device is connected.
6. L-band down converter according to claim 5, it is characterised in that also include：
Power splitter and wave detector；
The input of the power splitter connects the L-band signal output part of satellite system, the output end of the power splitter respectively with
The signal input part of first numerical-control attenuator is connected with the signal input part of wave detector, the output end of the wave detector with
The signal input part of described control unit is connected.
7. L-band down converter according to claim 6, it is characterised in that also include：
Single-pole double-throw switch (SPDT)；
The moved end of the single-pole double-throw switch (SPDT) is connected with the signal input part of power splitter, and the enable of the single-pole double-throw switch (SPDT) is defeated
Enter end be connected with the enable output end of described control unit, the single-pole double-throw switch (SPDT) first not moved end and it is described control singly
Unit signal output part be connected, the single-pole double-throw switch (SPDT) second not moved end connect satellite system L-band signal output
End.
8. L-band down converter according to claim 5, it is characterised in that the enable output end of described control unit is also
The first local oscillator signal output part and the second local oscillation signal output end are connected respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621453831.5U CN206313737U (en) | 2016-12-27 | 2016-12-27 | L-band down converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621453831.5U CN206313737U (en) | 2016-12-27 | 2016-12-27 | L-band down converter |
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| Publication Number | Publication Date |
|---|---|
| CN206313737U true CN206313737U (en) | 2017-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621453831.5U Active CN206313737U (en) | 2016-12-27 | 2016-12-27 | L-band down converter |
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| CN (1) | CN206313737U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109167608A (en) * | 2018-10-10 | 2019-01-08 | 北京遥感设备研究所 | A kind of miniaturization S-Ku wave band Ultra-Wideband RF Receiver |
-
2016
- 2016-12-27 CN CN201621453831.5U patent/CN206313737U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109167608A (en) * | 2018-10-10 | 2019-01-08 | 北京遥感设备研究所 | A kind of miniaturization S-Ku wave band Ultra-Wideband RF Receiver |
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