CN108199738A - The design method of superheterodyne reception channel sharing basic module - Google Patents
The design method of superheterodyne reception channel sharing basic module Download PDFInfo
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- CN108199738A CN108199738A CN201711008736.3A CN201711008736A CN108199738A CN 108199738 A CN108199738 A CN 108199738A CN 201711008736 A CN201711008736 A CN 201711008736A CN 108199738 A CN108199738 A CN 108199738A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
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Abstract
The invention discloses a kind of design methods of superheterodyne reception channel sharing basic module, and the whole realization difficulty for receiving channel and development time can be effectively reduced using the present invention.The technical scheme is that：Three kinds of common Building Blocks are designed first：Preselect module, frequency-variable module and ifd module；Secondly seriation exploitation is carried out for three kinds of common Building Block circuits, formed pre-selection module 1, pre-selection module 2 ... pre-selection module X, frequency-variable module 1, frequency-variable module 2 ... frequency-variable module Y, ifd module 1, ifd module 2 ... ifd module Z common Building Block series；When carrying out superheterodyne reception channel design again, corresponding module series is selected according to existing common Building Block product, suitable pre-selection module, frequency-variable module and ifd module is selected to be spliced and combined respectively；It is built using above-mentioned common Building Block and completes a complete superheterodyne reception channel, realize the quick design of superheterodyne reception channel.
Description
Technical field
The present invention relates to a kind of superheterodyne reception channels for being widely used in monitoring receiver, scanning receiver etc..Pass through
Dock the method that the exploitation of superheterodyne reception channel design is realized in the seriation exploitation of collection of letters road common Building Block.
Background technology
Superhet is because which employs gain the name during superheterodyne reception mode.So-called supradyne manner is exactly in receiver
In, local oscillation signal and the extraneous signal received are mixed in frequency mixer, generate a modulation rule and the extraneous signal phase received
Associated intermediate-freuqncy signal.The reception of extraneous signal is the process of a mixing, in this process, input letter received by antenna
Number, an intermediate-freuqncy signal is obtained after received channel mix, demodulator is sent into after amplification.Superheterodyne reception mode can be by changing
The frequency for becoming local oscillation signal easily realizes the tuning of receiver, at the same keep intermediate-freuqncy signal frequency it is constant, this can be with
Say be superhet many merits basic place.Primary or secondary (multiple) frequency conversion, which will can be used, in superhet to believe
In number frequency transformation to intermediate frequency.Single-conversion is simple in structure, at low cost, and avoids high-order image interference problem, but cannot be fast
Speed adapts to frequency change；Secondary (multiple) conversion architecture is complicated, of high cost, because any mixing in receiver will all generate image frequency
Frequency, high-order image interference problem is serious, this is more stringent but secondary to the selection of intermediate frequency and the requirement of mixing pre-filter
(multiple) frequency conversion can adapt to rapidly frequency change.
The sensitivity of receiver improves with the decline of noise coefficient and the reduction of intermediate-frequency bandwidth.Receiver first order mirror
Frequency rejects trap has a great impact to the sensitivity of receiver, and insertion loss directly reduces the sensitivity of receiver.
Therefore in the occasion of some more demanding sensitivity, usually low-noise amplifier is placed on the first order of receiver.But it does so
Image frequency and other it is spuious just enter in receiver together, make receiver poor linearity in addition oscillation, generate power it is excessive
Signal and make equipment burnout, therefore should not use in the occasion of broadband receiver or complex electromagnetic environment.
Image frequency inhibits the rejection ability that index reflection receiver interferes image frequency signal, must be subject in receiver design
The index that emphasis considers.Since frequency variation signal of the image frequency signal after frequency mixer is also fallen in the passband of intermediate-frequency filter,
Just seem necessary to the inhibition of image frequency signal.The method one for inhibiting image frequency signal is to improve frequency using image-rejection filter
The selectivity of band, second is that using high intermediate frequency, third, the method using multiple frequency conversion.The knot of these three methods is usually used in design
It closes.
Superheterodyne reception channel is that superhet realizes the core component that signal receives, the direct shadow of quality of performance
Ring the performance of entire receiver.Different superheterodyne reception channels has very big otherness.It is embodied in covering frequency range not
Same, sensitivity requirement difference, gain requirement difference, frequency flow difference, IF frequency difference etc..With advances in technology, surpass
The demand of heterodyne reception channel is constantly diversified, and the requirement of channel lead time is constantly shortened, and original superheterodyne reception is caused to be believed
Road method of production is increasingly not suitable with lead time requirement, develops and expends a large amount of human resources, and repetitive operation is more, cost without
Method controls.Therefore, quick response receives the manufacture claim of channel, and setting for superheterodyne reception channel is completed with minimum human resources
Meter is of great immediate significance.
Traditional carries out development scheme entirely to receive channel, and difficulty is larger.It is embodied in, technology realizes upper difficulty
Height needs to occupy a large amount of high-level research staff, and need research staff to entirely receive channel various pieces technical indicator,
Realization method, component are horizontal, realize that technique has the high cognition of comparison；In addition, to meet different index requests, need out
Sending out superheterodyne reception channel product a large amount of can just satisfy the use demand, time for being put into during exploitation, manpower, financial cost
It will be very big；Further more, the update of product, relatively difficult, the change of smaller technical indicator of upgrading, can all cause entire
Receive the adjustment of channel design；In addition later stage upgrading, maintenance also need to put into time and the human cost of equivalent.Therefore it is long-range
From the point of view of, carry out exploitation design entirely to receive channel, it is impossible to solve the time developed and cost contradiction.
Common Building Block is combed, forms the product type spectrum of common Building Block, is to solve to receive the channel lead time
One mode.Although superheterodyne reception channel is with very big otherness, its basic boom, flow in different receivers
It is identical.Therefore, product development is not carried out entirely to receive channel, but designs several reception channel sharing basic modules；For
It receives channel sharing basic module and carries out commercialization, seriation exploitation；Later further according to the index request for receiving channel, select not
Same common Building Block is combined, and is completed the entire splicing for receiving channel, is realized technical requirement.The benefit done so
It is that can carry out the rational division of work of human resources, is responsible for different superheterodyne reception channel sharing basic modules by different people,
The technical research of deep-going is carried out for basic module, it is more professional, more careful to accomplish.By high-caliber common Building Block,
And then realize high-caliber reception channel.In addition, the update of product, upgrading can also be converted into the upgrading of each module, maximum limit
The avoiding of degree changes happening that entire channel is caused all to redesign because of a small technical indicator.Meanwhile modularization
The technical indicator that design is also beneficial to channel is decomposed and is realized, by each common Building Block of the technical indicator fractionation of channel
In, more intuitively hold technological difficulties and major technique developing direction.
Invention content
Present invention part in view of the shortcomings of the prior art, provides a kind of quick, efficiently, and operability is strong, based on super
Heterodyne picks the superheterodyne reception channel design method of common Building Block.
The above-mentioned purpose of the present invention can be reached by following measures, a kind of superheterodyne reception channel sharing basic module
Design method.Three kinds of common Building Blocks are designed first：Preselect module, frequency-variable module and ifd module；Secondly three kinds are directed to
Common Building Block circuit carry out seriation exploitation, formed pre-selection module 1, pre-selection module 2 ... pre-selection module X, frequency-variable module 1,
Frequency-variable module 2 ... frequency-variable module Y, ifd module 1, the common Building Block of ifd module 2 ... ifd module Z are serial；It carries out again
During superheterodyne reception channel design, corresponding module series is selected according to existing common Building Block product, it is suitable to select respectively
Pre-selection module, frequency-variable module and ifd module are spliced and combined；Finally one is completed using above-mentioned common Building Block structure
Complete superheterodyne reception channel, and then realize the quick design of superheterodyne reception channel.
The present invention can utilize above-mentioned common Building Block to build a kind of input frequency 0.03GHz-3GHz, and output intermediate frequency is
The superheterodyne reception channel of 140MHz；If being changed to, one input frequency shift of design is 2GHz-6GHz, output intermediate frequency is 375MHz
Superheterodyne reception channel, only need to will pre-selection module replace with comprising low-noise amplifier, preselection switch and preselection filter
Pre-selection module, ifd module is replaced with to the ifd module for including intermediate frequency switching switch, intermediate-frequency filter and intermediate frequency amplifier,
And then realize the quick design of superheterodyne reception channel.
The beneficial effects of the present invention are,
Quickly, efficiently.The present invention three kinds of common Building Blocks of design：Preselect module, frequency-variable module and ifd module；Pass through design
Several common Building Blocks carry out series exploitation to common Building Block, for three kinds of common Building Block circuits, carry out series
Hair is melted, forms common Building Block series of products；When carrying out superheterodyne reception channel design again, according to existing mutual foundation mould
Block product line selects the mode that suitable pre-selection module, frequency-variable module and ifd module are spliced and combined to realize super respectively
Heterodyne reception channel design simplifies design difficulty, saves design cost, effectively reduce receive channel it is whole realize difficulty and
Development time.
Operability is strong.The present invention only designs three kinds of common Building Blocks, carries out respective series exploitation, utilizes basic mould
Block builds a kind of input frequency 0.03GHz-3GHz, the superheterodyne reception channel that output intermediate frequency is 140MHz；If it is changed to design one
It is a input frequency shift be 2GHz-6GHz, output intermediate frequency be 375MHz superheterodyne reception channel, only need to will pre-selection module, in
Frequency module is replaced accordingly, with regard to that can meet the design requirement of superheterodyne reception channel, and late design upgrading, product maintenance
Also there is very strong convenience, have the characteristics that operability is strong.
Description of the drawings
In order to further illustrate rather than limitation the present invention above-mentioned realization method, below in conjunction with the accompanying drawings for example, from
And become apparent the details of the present invention and advantage.
Fig. 1 is the superheterodyne reception channel flow diagram based on the present invention.
Fig. 2 is the splicing circuit diagram of superheterodyne reception channel sharing basic module first embodiment of the present invention.
Fig. 3 is the splicing circuit diagram of superheterodyne reception channel sharing basic module second embodiment of the present invention.
Fig. 4 is the circuit theory schematic diagram for preselecting module first embodiment.
Fig. 5 is the circuit theory schematic diagram for preselecting module second embodiment.
Fig. 6 is the circuit theory schematic diagram of frequency-variable module first embodiment.
Fig. 7 is the circuit theory schematic diagram of frequency-variable module second embodiment.
Fig. 8 is the circuit theory schematic diagram of frequency-variable module 3rd embodiment.
Fig. 9 is the circuit theory schematic diagram of ifd module first embodiment.
Figure 10 is the circuit theory schematic diagram of ifd module second embodiment.
Specific embodiment
Refering to Fig. 1.According to the present invention, three kinds of common Building Blocks are built first：Preselect module, frequency-variable module and intermediate frequency mould
Block；Secondly seriation exploitations are carried out for three kinds of common Building Block circuits, formed pre-selection module 1, pre-selection module 2 ... pre-selection
Module X, frequency-variable module 1, frequency-variable module 2 ... frequency-variable module Y, ifd module 1, ifd module 2 ... ifd module Z shared base
Plinth series of modules；Superheterodyne reception channel design is carried out again, and corresponding module series is selected according to existing common Building Block product,
Suitable pre-selection module, frequency-variable module and ifd module is selected to be spliced and combined respectively；Finally utilize above-mentioned mutual foundation mould
Block structure completes a complete superheterodyne reception channel, and then realizes the quick design of superheterodyne reception channel.
Refering to Fig. 2.The superheterodyne reception channel built in Fig. 2 embodiments is by being followed successively by pre-selection module along signal flow direction, becoming
Frequency module and ifd module, three basic modules are formed, wherein, pre-selection module can select covering frequence ranging from 0.03GHz-
The preselection filter 1 of 3GHz, preselection filter 2 ... the pre-selection module of preselection filters n, frequency-variable module can be selected containing 2
The frequency-variable module for being suitable for 2 frequency conversion situations of a frequency mixer, it is 140MHz's that ifd module, which can be selected comprising centre frequency,
The ifd module of intermediate-frequency filter 1- intermediate-frequency filters n.It is directly connected between three modules, without increasing other circuits.In Fig. 2
In illustrated embodiment, a kind of input frequency 0.03GHz-3GHz is built using above-mentioned common Building Block, output intermediate frequency is
The superheterodyne reception channel of 140MHz；If being changed to, one input frequency shift of design is 2GHz-6GHz, output intermediate frequency is 375MHz
Superheterodyne reception channel, only need to will pre-selection module replace with comprising low-noise amplifier, preselection switch and preselection filter
Pre-selection module, ifd module is replaced with to the ifd module for including intermediate frequency switching switch, intermediate-frequency filter and intermediate frequency amplifier,
And then realize the quick design of superheterodyne reception channel.Preselect module select be respectively Fig. 4 pre-selection module, ifd module and
Frequency-variable module can select the frequency-variable module of Fig. 7 and the ifd module of Fig. 9.
Refering to Fig. 3.The superheterodyne reception channel built in Fig. 3 embodiments is made of three basic modules, is flowed to along signal
It is followed successively by pre-selection module, frequency-variable module and ifd module.The covering frequence ranging from 2GHz- that wherein pre-selection module can be selected
The preselection filter 1- preselection filters n pre-selection modules of 6GHz, frequency-variable module can be selected containing 2 frequency mixers, suitable for 2 times
The frequency-variable module of frequency conversion situation, ifd module can be selected comprising the intermediate-frequency filter 1- intermediate frequency filterings that centre frequency is 375MHz
The ifd module of device n.It is directly connected between three modules, without increasing other circuits.Utilize the common Building Block structure
It builds a kind of input frequency shift to be 2GHz-6GHz, export the superheterodyne reception channel that intermediate frequency is 375MHz, compared with Fig. 2, only
Pre-selection module is replaced with into module shown in Fig. 5, ifd module is replaced with to module shown in Figure 10, and then realizes superheterodyne reception letter
The quick design in road.
In Fig. 2, Fig. 3 embodiment, the low-noise amplifier that uses of pre-selection module can be selected flat in full working frequency range
Broad band amplifier, different in the gain of different frequency range according to amplifier, the insertion loss with reference to each frequency range preselection filter is poor
It is different, gain compensation should be carried out preselection filter is front/rear, after rear stage frequency range switching switch plus one-stage low-pass filter；In
Small stepping numerical-control attenuator is added in frequency module, to carry out gain-adjusted or the gain fluctuation of wide-band supplemented,
The output terminal of ifd module adds in limiter and output amplitude is limited.
In the embodiment shown in fig. 4, preselection filter 1- preselection filters n covering frequences range 0.03GHz-3GHz is
Row melt the pre-selection module of hair, and the pre-selection series of modules of actual development is not limited to exemplary design conditions.Pre-selection module includes
Main devices have low-noise amplifier, preselection switch and a preselection filter, signal input is by low-noise amplifier, then leads to
It crosses frequency range selecting switch to be selected, is solid between preselection filter and Frequency Band Selection switch by different preselection filters
Determine attenuator, exported after Frequency Band Selection switch by low-pass filter.In the design process, some design details need special
Concern.Such as low-noise amplifier should select broad band amplifier flat in full working frequency range as possible.According to amplifier in difference
The gain of frequency range is different, with reference to the insertion loss difference of each frequency range preselection filter, should carry out gain preselection filter is front/rear
Compensation.Frequency range switching switch mainly considers switch isolation degree, and anti-stop signal carries out crosstalk by closing on preselection filter.Rear stage
Low-pass filter after frequency range switching switch, the main inhibition realized to image frequency signal.
In the embodiment shown in fig. 5, preselection filter 1- preselection filters n covering frequences range 2GHz-6GHz, remaining sets
It is identical with Fig. 4 to count details.The Seriation Design of pre-selection module shown in Fig. 4, Fig. 5 is mainly aiming at the covering of preselection filter frequency
Duan Jinhang differences design, and form series of products.
In the embodiment shown in fig. 6, first, frequency mixer used should select broadband mixer as possible, in this way in subsequent liter
Change can be reduced in grade, process of optimization.The numerical-control attenuator of circuit input end carries out dynamic range to subsequent design
Extension.Attenuator should be fixed between frequency mixer and wave filter improves link standing wave situation.Frequency-variable module is applied to comprising 1
The frequency mixer of the ifd module of single-conversion superhet channel, adding between frequency mixer and wave filter even improves consolidating for link standing wave
Determine attenuator；By numerical-control attenuator after signal input, into frequency mixer, export after fixed attenuator, in one
Frequency wave filter exports.The frequency-variable module schematic diagram example of seriation exploitation, the frequency-variable module series of actual development are not limited to example
Design conditions.The main devices that frequency-variable module includes are frequency mixer and corresponding intermediate-frequency filter.
In the embodiment shown in fig. 7, Fig. 7 and the main difference of Fig. 6 are that the quantity of frequency mixer is different and respective mixers
Intermediate-frequency filter afterwards is different.Frequency-variable module, which is connected on comprising 2 in the first fixed attenuator, an intermediate-frequency filter, one, to be amplified
Frequency mixer between device, the second fixed attenuator, to be applied to 2 frequency conversion superheterodyne reception channels.By number after signal input
Control attenuation enters a frequency mixer, is sent into amplifier in one using an intermediate-frequency filter by the first fixed attenuator, is put in one
Big device output enters two frequency mixers through the second fixed attenuator, and the output of two frequency mixers is filtered through third fixed attenuator through two intermediate frequencies again
Wave device exports.
In the embodiment shown in fig. 8, Fig. 8 and the main difference of Fig. 7, Fig. 6 are that the quantity of frequency mixer is different and corresponding mixed
Intermediate-frequency filter after frequency device is different.The Seriation Design of frequency-variable module shown in Fig. 6, Fig. 7, Fig. 8 is primarily directed to frequency mixer number
Amount be changed and frequency mixer after intermediate-frequency filter variation, to adapt to different frequency flows.Frequency-variable module packet
The frequency mixer for being applied to 3 frequency conversion superheterodyne reception channels containing 3 enters a mixing after signal input by numerical-control attenuator
Device exports and is sent into amplifier in one using an intermediate-frequency filter after the first fixed attenuator, and amplifier exports warp in one
Second fixed attenuator enter two frequency mixers, two frequency mixers output through third fixed attenuator again through two intermediate-frequency filters export to
Amplifier in two, in two the output of amplifier sent through the 4th fixed attenuator to three-mixer, the output of three-mixer is through the 5th
Fixed attenuator passes through output signal after three intermediate-frequency filters.
In the embodiment shown in fig. 9, ifd module is the ifd module schematic diagram example of seriation exploitation, actual development
Ifd module series is not limited to exemplary design conditions.In the output terminal of ifd module, limiter pair should be also added in as needed
Output amplitude is limited, and limiter should focus on to consider influence of its linearity to entire linear degree.In the design process,
There are some design details to need to pay special attention to.Final amplifier quantity will be selected according to actual conditions, and level-one is used in Fig. 9 examples
Final amplifier, but most final stage can just can guarantee linearity index request, two-stage end with two-stage final amplifier in some cases
Should be fixed attenuator between grade amplifier improves standing wave.The main devices that ifd module includes have intermediate frequency switching switch, in
Frequency wave filter and intermediate frequency amplifier.Signal input after through low-pass filter be sent into amplifier, amplifier by numerical-control attenuator into
Enter band width switch, the output of band width switch is through intermediate-frequency filter 1- intermediate-frequency filter n of the centre frequency for 140MHz
Temperature compensation attenuator is sent into through band width switch again, is exported using final amplifier, limiter.Ifd module should also contain temperature
Attenuator is mended into the gain compensation of trip temperature and adds in carry out gain-adjusted or supplement the gain fluctuation of wide-band
Small stepping numerical-control attenuator.
In Figure 10 embodiments, amplifier is sent into through low-pass filter after signal input, amplifier passes through numerical-control attenuator
Into band width switch, the output of band width switch is through intermediate-frequency filter 1- intermediate-frequency filter of the centre frequency for 375MHz
N is sent into temperature compensation attenuator through band width switch again, amplifies using the first final amplifier, fixed attenuator, the second final stage
After device, exported through limiter.The ifd module main distinction is that selected intermediate-frequency filter IF frequency is different, selected
Final amplifier quantity is variant, and attenuator is fixed between first, second final amplifier improves standing wave, remaining details phase
Together.
The Seriation Design of ifd module shown in Fig. 9, Figure 10 is changed primarily directed to the frequency of intermediate-frequency filter, is used
To adapt to different IF frequency.
Claims (10)
1. a kind of design method of superheterodyne reception channel sharing basic module, it is characterised in that include the following steps：It sets first
Count three kinds of common Building Blocks：Preselect module, frequency-variable module and ifd module；Secondly for three kinds of common Building Block circuits into
Row seriation develop, formed pre-selection module 1, pre-selection module 2 ... pre-selection module X, frequency-variable module 1, frequency-variable module 2 ... frequency conversion mould
Block Y, ifd module 1, the common Building Block of ifd module 2 ... ifd module Z are serial；Superheterodyne reception channel design is carried out again
When, corresponding module series is selected according to existing common Building Block product, select respectively suitable pre-selection module, frequency-variable module and
Ifd module is spliced and combined；Finally a complete superheterodyne reception is completed using above-mentioned common Building Block structure to believe
Road, and then realize the quick design of superheterodyne reception channel.
2. the design method of superheterodyne reception channel sharing basic module as described in claim 1, it is characterised in that：Using upper
It states common Building Block and builds a kind of input frequency 0.03GHz-3GHz, the superheterodyne reception channel that output intermediate frequency is 140MHz；
If be changed to design one input frequency shift be 2GHz-6GHz, output intermediate frequency be 375MHz superheterodyne reception channel, only need by
Pre-selection module replaces with the pre-selection module comprising low-noise amplifier, preselection switch and preselection filter, replaces ifd module
The ifd module for including intermediate frequency switching switch, intermediate-frequency filter and intermediate frequency amplifier is changed to, and then realizes superheterodyne reception channel
Quick design.
3. the design method of superheterodyne reception channel sharing basic module as described in claim 1, it is characterised in that：Pre-selection filter
Wave device 1- preselection filter n covering frequence range 0.03GHz-3GHz, the pre-selection module of seriation exploitation, pre-selection module include
Low-noise amplifier, preselection switch and preselection filter, signal input is by low-noise amplifier, then is opened by Frequency Band Selection
It puts capable selection into, is fixed attenuator between preselection filter and Frequency Band Selection switch by different preselection filters, frequency range
It is exported after selecting switch by low-pass filter.
4. the design method of superheterodyne reception channel sharing basic module as described in claim 1, it is characterised in that：Pre- modeling
Low-noise amplifier that block uses selects broad band amplifier flat in full working frequency range, according to amplifier different frequency range increasing
It is beneficial different, with reference to the insertion loss difference of each frequency range preselection filter, in the front/rear carry out gain compensation of preselection filter, rear
Add one-stage low-pass filter after level-one frequency range switching switch；Small stepping numerical-control attenuator is added in ifd module, to carry out
Gain-adjusted supplements the gain fluctuation of wide-band, in the output terminal of ifd module, adds in limiter to output amplitude
It is limited.
5. the design method of superheterodyne reception channel sharing basic module as described in claim 1, it is characterised in that：Frequency conversion mould
Block includes the frequency mixer of 1 ifd module for being applied to single-conversion superhet channel, between frequency mixer and wave filter plus connects
Improve the fixed attenuator of link standing wave, enter frequency mixer by numerical-control attenuator after signal input, output is by fixed attenuation
After device, exported using an intermediate-frequency filter.
6. the design method of superheterodyne reception channel sharing basic module as described in claim 1, it is characterised in that：Frequency conversion mould
Block is is connected in the first fixed attenuator, an intermediate-frequency filter, one between amplifier, the second fixed attenuator comprising 2
Frequency mixer enters one by numerical control attenuation to be applied to the ifd module of 2 frequency conversion superhet channels, after control signal input and mixes
Frequency device is sent into amplifier in one by the first fixed attenuator using an intermediate-frequency filter, and amplifier output is through second in one
Fixed attenuator enters two frequency mixers, and the output of two frequency mixers is exported through third fixed attenuator through two intermediate-frequency filters again.
7. the design method of superheterodyne reception channel sharing basic module as described in claim 1, it is characterised in that：Frequency conversion mould
Block includes the frequency mixer of 3 ifd modules for being applied to 3 frequency conversion superhet channels, by numerical control attenuation after control signal input
Device enters a frequency mixer, exports and is sent into amplifier in one using an intermediate-frequency filter after the first fixed attenuator, in one
Amplifier output enters two frequency mixers through the second fixed attenuator, and the output of two frequency mixers is through third fixed attenuator again through two intermediate frequencies
Wave filter is exported to amplifier in two, in two the output of amplifier sent through the 4th fixed attenuator to three-mixer, three-mixer
Output after the 5th fixed attenuator, by three intermediate-frequency filters output signal.
8. the design method of superheterodyne reception channel sharing basic module as described in claim 1, it is characterised in that：Intermediate frequency mould
Block includes intermediate frequency switching switch, intermediate-frequency filter and intermediate frequency amplifier；It is sent into and amplifies through low-pass filter after signal input
Device, amplifier enter band width switch by numerical-control attenuator, and the output of band width switch is 140MHZ through centre frequency
Intermediate-frequency filter 1- intermediate-frequency filters n again through band width switch be sent into temperature compensation attenuator, using final amplifier, amplitude limit
Device exports.
9. the design method of superheterodyne reception channel sharing basic module as described in claim 1, it is characterised in that：Intermediate frequency mould
Block should also contain temperature compensation attenuator into the gain compensation of trip temperature and add in carry out gain-adjusted or the gain to wide-band
Fluctuate the small stepping numerical-control attenuator supplemented.
10. the design method of superheterodyne reception channel sharing basic module as described in claim 1, it is characterised in that：Signal
Low-pass filter is inputted, is sent into amplifier, amplifier enters band width switch by numerical-control attenuator, band width switch
Output is sent into temperature compensation attenuation through the intermediate-frequency filter 1- intermediate-frequency filter n that centre frequency is 375MHz, then through band width switch
Device is exported after the first final amplifier, fixed attenuator, the second final amplifier by limiter.
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| CN201550107U (en) * | 2009-11-19 | 2010-08-11 | 成都九洲迪飞科技有限责任公司 | Wideband transceiver |
| CN101834620A (en) * | 2010-03-11 | 2010-09-15 | 成都九洲迪飞科技有限责任公司 | Broadband receiver with phase-locked loop local oscillation circuit |
| CN101969313A (en) * | 2010-08-02 | 2011-02-09 | 四川九洲电器集团有限责任公司 | Single-channel two-path broadband frequency-hopping digital receiving system |
| CN106533472A (en) * | 2016-11-24 | 2017-03-22 | 中国科学院微电子研究所 | Ultra-wide-band general receiver |
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| CN108199738B (en) | 2020-07-17 |
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