CN206060732U - A kind of wide dynamic range AFE (analog front end) - Google Patents
A kind of wide dynamic range AFE (analog front end) Download PDFInfo
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- CN206060732U CN206060732U CN201621121819.4U CN201621121819U CN206060732U CN 206060732 U CN206060732 U CN 206060732U CN 201621121819 U CN201621121819 U CN 201621121819U CN 206060732 U CN206060732 U CN 206060732U
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- transformator
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- analog front
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Abstract
This utility model discloses a kind of wide dynamic range AFE (analog front end), including transformator input, the output of low-noise amplifier 1, band filter 1, low-noise amplifier 2, band filter 2, agc circuit, transformator and power supply.Transformator input, low-noise amplifier 1, band filter 1, low-noise amplifier 2, band filter 2, agc circuit and transformator output are cascaded successively, power supply is connected with low-noise amplifier 1, low-noise amplifier 2 and agc circuit respectively, the input of transformator importation is connected with antenna, and the output of transformator output par, c is connected with late-class circuit.Agc circuit of this utility model by multistage amplification, filtering and wide dynamic range, realizes the low noise amplification of signal.By Signal Integrity Design, it is ensured that the high s/n ratio and high stability of system.By test, gain-adjusted scope of the present utility model is 30dB ~ 120dB, and when input 110dBm, output signal-to-noise ratio is still above 25dB, with very strong practicality.
Description
Technical field
Originally radar and communications field, more particularly to a kind of wide dynamic range AFE (analog front end) are belonged to.
Background technology
Radar and the important branch that radio communication is modern electronic technology development, radar is used as a kind of radio detection skill
Art, is widely used in the application scenario such as military, civilian, and radio communication not only exists as a kind of electronic technology more popularized
The hard-core technology such as national defence, space flight field is applied, even more the indispensable information means of exchange of people's daily life.Radar
All be, as the route of transmission of signal, to be received and sent messages electromagnetic space by antenna with radio communication, realize the transmission of information with
Receive.Due to decay of the electromagnetic space to signal, the signal that antenna is received all is extremely faint radiofrequency signal, and is mingled with
Interference and the noise in broadband, therefore before signal does relevant treatment, needed to be amplified signal, filtered and amplitude conditioning
Deng processing, here it is the analog front-end module of radar and wireless communication system needs the function of realizing.
The main performance index of AFE (analog front end) includes：Frequency response, gain control range（That is dynamic range）, noise characteristic
Deng.Frequency response determines the frequency range of the radiofrequency signal that AFE (analog front end) can be processed, and for different application scenarios, needs
The different frequency response performance of design.Gain control range is the dynamic characteristic for characterizing AFE (analog front end), i.e., for different amplitudes
The amplifying power of signal, gain control range are bigger, then the dynamic range of the signal amplitude that AFE (analog front end) can be nursed one's health is bigger, i.e.,
Before the distance that radar can be detected is more remote, and the distance that communication system can be transmitted is also more remote, therefore gain control range is simulation
The important indicator at end.Noise characteristic is the difference of the output signal-to-noise ratio and input signal-to-noise ratio of system, and the value is less, it was demonstrated that AFE (analog front end)
Noise inhibiting ability it is stronger.
In order to improve the operating distance of radar and communications system, very high requirement is proposed to AFE (analog front end), simulated at present
The scheme of front end is a lot, and achieves preferable actual effect.In order to further improve the index of AFE (analog front end), the present embodiment
The AFE (analog front end) that a kind of dynamic range for being applied to ultra-high frequency band is 90dB is proposed, relative to common design, this
Embodiment has lower noise coefficient and broader gain control range.
Utility model content
In order to improve the performance indications of AFE (analog front end), the utility model proposes a kind of simple structure, working stability, it is low into
Originally, high performance AFE (analog front end).
In order to improve the performance indications of AFE (analog front end), this utility model is adopted the following technical scheme that：A kind of wide dynamic model
The AFE (analog front end) enclosed, including transformator input module, low-noise amplifier 1, band filter 1, low-noise amplifier 2, band logical
Wave filter 2, AGC（Automatic growth control）Circuit, transformator output module and power supply；
Described transformator input module is the input of system, transformator input reception antenna output signal；Described
Low-noise amplifier 1 and low-noise amplifier 2 are used for the amplification of signal；Described band filter 1 and band filter 2 are used for
The filtering of signal and inter-stage impedance matching；Described agc circuit is used for the amplitude adjusted of signal, by signal unification conditioning to necessarily
Range value；Described transformator output module is used for the output of signal, while realizing isolating for AFE (analog front end) and subsequent conditioning circuit；
Described power supply be system energy source, respectively the low-noise amplifier 1 and low-noise amplifier 2 of system and
Agc circuit is powered；
Transformator input module, low-noise amplifier 1, band filter 1, low-noise amplifier 2, band filter 2,
Agc circuit and transformator output module are cascaded successively, also, power supply respectively with low-noise amplifier 1, low noise amplification
Device 2 and agc circuit are connected, and the input of transformator input module is connected with external antenna, the output of transformator output module and
The input of subsequent conditioning circuit is connected.
Preferably, transformator input module and the two-part transformator of transformator output module adopt mini
The radio-frequency transformer ADT1-1WT of circuits companies.
Preferably, low-noise amplifier 1 and 2 two-part amplifier of low-noise amplifier are respectively adopted 2 mini
The radio frequency low-noise amplifier CMA5043 cascades of circuits companies realize that 2 amplifiers are joined directly together using AC coupled.
Preferably, band filter 1 and band filter 2 gather into the realization of higher order passive LC wave filter, center frequency
Rate 160MHz, bandwidth 10MHz.
Preferably, agc circuit is built using the voltage control Amplifier AD8367 of 2 ADI companies, first piece is operated in
VGA（Voltage control Amplifier）Pattern, second is operated in agc mode, and the detecting circuit of second AD8367 is simultaneously as two
The gain-controlled voltage of piece AD8367.
Preferably, high Ripple Suppression ratio, the adjustable linear voltage stabilizing chip of quick response of the power supply using TI
TPS7A4501 realizations, by adjusting circuit parameter, realize 5V direct current outputs.
The operation principle of this utility model device is as follows：
The radiofrequency signal of antenna coupling is input a signal in AFE (analog front end), signal by transformator input module part
The amplification of 46dB is realized by two panels CMA5043 of low-noise amplifier 1, is once filtered by band filter 1, then is led to
Cross low-noise amplifier 2 two panels CMA5043 realize the amplification of 46dB after, carry out second filtering into band filter 2, its
Output signal carries out amplitude adjusted by agc circuit, realizes being connected with late-class circuit eventually through transformator output module part.
Meanwhile, the linear voltage stabilization chip of power management module provides energy for system.As AGC gain span of control is 0 ~ 90dB, then
6dB voltage attenuations and transformator, the Insertion Loss of wave filter etc. are associated with view of level each time, the system passes through this AFE (analog front end),
The gain control range of 30dB ~ 120dB can finally be realized.The PCB of circuit adopt 4 laminates, stepped construction be signal, electricity
Source, signal, by designing stacking spacing and trace width, realize the control of 50 Ω characteristics impedance, effectively reduce the anti-of signal
Penetrate.
Compared with prior art, this utility model has the characteristics that：
1st, realize that the prime of signal amplifies filter using the band filter of performance brilliance low-noise amplifier and narrower bandwidth
Ripple so that the noise coefficient very little of system, the signal to noise ratio of output signal are higher, is conducive to improving the processing accuracy of late-class circuit.
2nd, cascaded using two panels AD8367, first piece is operated in VGA modules, and second is operated in AGC modules, it is common to realize
The gain control range of 90dB, substantially increases the dynamic range of AFE (analog front end), that is, improve radar and communication system has
Effect operating distance.
3rd, the power supply of system, the ripple of the chip are realized using high accuracy fast linear voltage stabilizing chip TPS7A4501 of TI
As little as 35uV, Ripple Suppression are powered for AFE (analog front end) by adjusting circuit parameter and being allowed to export 5V DC voltages than up to 68dB,
The Power Integrity of system can be better ensured that.
Description of the drawings
Fig. 1 is the entire block diagram being originally embodied as；
Fig. 2 is the transformator input circuit figure being originally embodied as；
Fig. 3 is the circuit diagram of the low-noise amplifier 1 and low-noise amplifier 2 being originally embodied as；
Fig. 4 is the theory diagram of the agc circuit being originally embodied as；
Fig. 5 is the circuit diagram of the agc circuit being originally embodied as；
Fig. 6 is the circuit diagram of the transformator output being originally embodied as；
Fig. 7 is the circuit diagram of the power supply being originally embodied as.
Specific embodiment
Understand for the ease of those of ordinary skill in the art and implement the present embodiment, below in conjunction with the accompanying drawings and specific embodiment
This utility model is described further.
As shown in figure 1, the present embodiment mainly includes the transformator input module being input into for aerial signal, puts for signal
The low-noise amplifier 1 and low-noise amplifier 2 of big device, band filter 1 and band filter 2 for signal filtering, use
In the signal amplitude agc circuit for adjusting, the transformator output module being connected with subsequent conditioning circuit for signal and for providing energy
The power supply of amount, wherein transformator input module, low-noise amplifier 1, band filter 1, low-noise amplifier 2, band logical
Wave filter 2, AGC（Automatic growth control）Circuit and transformator output module are cascaded successively, also, power supply and low noise
Amplifier 1 is connected with low-noise amplifier 2 and agc circuit, and the input of transformator input module is connected with antenna, transformator
The outfan of output module is connected with the input of subsequent conditioning circuit.
As shown in Fig. 2 transformator input module is realized using the radio-frequency transformer ADT1-1WT of mini circuits, should
The frequency response of transformator is 1MHz ~ 800MHz, and band attenuation is less than 0.4dB.One of the transformator of transformator input module
Foot connects the output ANT_OUT of antenna, another foot ground connection, cable ground of this place for antenna.The transformator of transformator output module
One foot connects the input IN1 of late-class circuit, another foot ground connection, signal ground of this place for AFE (analog front end).Cable ground and signal ground are not
It is joined directly together, realizes isolating for antenna and AFE (analog front end).
As shown in figure 3, the radio frequency that low-noise amplifier 1 and low-noise amplifier 2 use mini circuits is low
Noise amplifier CMA5043 realizes that the amplifier AC coupled input and output, input and output impedance are 50 Ω, frequency response
For 50MHz ~ 4GHz, with the interior fixed gain that can provide about 23dB, meanwhile, the noise coefficient as little as 0.75dB of chip, very
The application scenario of suitable low noise.
Band filter 1 and band filter 2 use integrated higher order passive LC wave filter and realize.The wave filter
Mid frequency be 160MHz, bandwidth 10MHz, 40dB frequency of fadings are respectively 120MHz and 200MHz, and band attenuation is about
1dB, can be used for the AIS of maritime affairs using the AFE (analog front end) of this wave filter（Ship automatic identification system）The front end signal of receiver
Amplify, if the signal frequency spectrum and bandwidth that AFE (analog front end) is processed is different, need to only change the mid frequency and bandwidth of this wave filter
.
The theory diagram of agc circuit of the present utility model is as shown in figure 4, input signal Vi is the output of band filter 2
Signal, exports after 2 controllable gain amplifier AD8367 amplify.By root-mean-square, output signal detects that circuit obtains output
The root-mean-square value of signal, then the high-frequency noise that root-mean-square detects circuit is filtered by wave filter, obtain direct current signal.Wave filter is defeated
Go out by comparator realization and the comparison of reference signal Vr, obtain error signal Ve.Ve is obtained by control signal generator can
Control signal Vc of control gain amplifier, while controlling 2 amplifier operations, realizes the feedback regulation of circuit.AD8367 chips
Cymoscope is carried, i.e., can realize the part of dotted line inframe, outside only needs to add wave filter as control signal generator i.e.
Achievable AGC functions.
The physical circuit of AGC is as shown in Figure 5.2 AD8367 inputs respectively by the resistance R8 and R10 of 66 Ω over the ground
The impedance matching of 50 Ω is realized, then AC coupled is realized by the electric capacity C10 and C15 of 10nF respectively.4 foot of chip（MODE）All connect
Ground, it is ensured that the gain of amplifier is reduced with the increase of control voltage, so as to ensure that agc circuit is negative feedback.Second
The root-mean-square detection output pin 6 of AD8367（DET0）Realized to rms voltage by the bypass circuit C17 of a 0.01uF
Filtering, obtain the control voltage of gain controlled amplifier, while controlling the gain of first piece and second amplifier.In order to anti-
Only during amplifier operation detection output pin signal it is excessive cause chip cannot normal work, using PNP triode
2n3906 coordinates resistance R12 and R13, realizes the clamper of detection output voltage.The gain control range of a piece of AD8367 be 0 ~
45dB, 2 cascade the super-wide dynamic range that can realize 0 ~ 90dB.
As shown in fig. 6, the radio-frequency transformer ADT1-1WT that transformator output is also adopted by mini circuits is realized.Transformation
One foot of the transformator of device input module connects the output of agc circuit, another foot ground connection, the signal ground of this place AFE (analog front end).Become
One foot of the transformator of depressor output module meets the input IN2 of late-class circuit, and another foot is grounded, and this place is follow-up signal
Ground.AFE (analog front end) ground and the ground of subsequent conditioning circuit are not joined directly together, and realize isolating for AFE (analog front end) and late-class circuit, reduce follow-up electric
Interference of the road to the small-signal of AFE (analog front end).
As shown in fig. 7, using TPS7A4051, power supply realizes that the chip output voltage is adjustable, by by resistance R16
3.13k and 1k are adjusted to respectively with R17, can realize the voltage stabilizing output of 5V.The input of chip adopts magnetic bead BLM31PG102SN1
Carry out EMI（Electromagnetic interference）Filtering, carries out input decoupling using C18 and C19, carries out output filtering using C20, further improve
The degree of stability of the output voltage of chip.
The using method of this device is as follows：
Antenna is connected to by cable the input of the transformator input module of AFE (analog front end), signal is entered by transformator
AFE (analog front end), then band filter 1 is entered after low-noise amplifier 1 amplifies 46dB, the first time filtering of signal is realized, then
Band filter 2 is entered after low-noise amplifier 2 amplifies 46dB, second filtering is carried out, filtered output signals enter AGC
Circuit.The root-mean-square value by detecting output signal of agc circuit, if root-mean-square value is higher than reference voltage, increases control
Voltage so that gain reduces so that output voltage is reduced；If root-mean-square value is lower than reference voltage, reduce control voltage, make
Obtaining gain increases so that output voltage increases, and realizes AGC functions.The output of agc circuit realizes letter by transformator output module
Number output with isolate.
Method or software involved by this utility model is prior art, is not belonging in innovation of the present utility model
Hold, this utility model is only improved to hardware and innovation.
The above is most preferred embodiment of the present utility model, not makees any pro forma restriction to this utility model,
Every any simple modification, equivalent variations and modification above example made according to technical spirit of the present utility model, still
Fall in protection domain of the present utility model.
Claims (6)
1. a kind of wide dynamic range AFE (analog front end), is characterized in that：Including transformator input module, the filter of low-noise amplifier 1, band logical
Ripple device 1, low-noise amplifier 2, band filter 2, automatic growth control-agc circuit, transformator output module and power supply
Power supply；
The transformator input module reception antenna output signal；The low-noise amplifier 1 and low-noise amplifier 2 are used to believe
Number low noise amplification；The band filter 1 and band filter 2 are used for the filtering of signal；The agc circuit is used for signal
Automatic growth control；Described transformator output module is used for the output of AFE (analog front end) signal；Described power supply is to be
System provides energy；
Transformator input module, low-noise amplifier 1, band filter 1, low-noise amplifier 2, band filter 2, AGC are electric
Road and transformator output module are cascaded successively, power supply respectively with low-noise amplifier 1, low-noise amplifier 2 and AGC
Circuit is connected, and the input of transformator input module is connected with antenna, and the output of transformator output module is connected with late-class circuit.
2. a kind of wide dynamic range AFE (analog front end) according to claim 1, is characterized in that：Described transformator input module
The radio-frequency transformer ADT1-1WT of mini circuits companies is adopted with the transformator in transformator output module.
3. a kind of wide dynamic range AFE (analog front end) according to claim 1, is characterized in that：Described low-noise amplifier 1
The radio frequency low-noise amplifier of 2 mini circuits companies is respectively adopted with 2 two-part amplifier of low-noise amplifier
CMA5043 cascades realize that 2 amplifiers are joined directly together using AC coupled.
4. a kind of wide dynamic range AFE (analog front end) according to claim 1, is characterized in that：Described 1 He of band filter
Band filter 2 gathers into the realization of higher order passive LC wave filter, mid frequency 160MHz, bandwidth 10MHz.
5. a kind of wide dynamic range AFE (analog front end) according to claim 1, is characterized in that：Described agc circuit adopts 2
The voltage control Amplifier AD8367 of ADI companies builds, and first piece is operated in voltage control Amplifier VGA mode, second work
Make in agc mode, the detecting circuit of second AD8367 is while as the gain-controlled voltage of two panels AD8367.
6. a kind of wide dynamic range AFE (analog front end) according to claim 1, is characterized in that：Described power supply adopts TI
High Ripple Suppression ratio, adjustable linear voltage stabilizing chip TPS7A4501 of quick response realize, by adjusting circuit parameter, realize
5V direct current outputs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621121819.4U CN206060732U (en) | 2016-10-12 | 2016-10-12 | A kind of wide dynamic range AFE (analog front end) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621121819.4U CN206060732U (en) | 2016-10-12 | 2016-10-12 | A kind of wide dynamic range AFE (analog front end) |
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| CN206060732U true CN206060732U (en) | 2017-03-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107222228A (en) * | 2017-07-18 | 2017-09-29 | 上海东软载波微电子有限公司 | Automatic gain control circuit and its control method, receiver |
| CN109412619A (en) * | 2018-12-11 | 2019-03-01 | 中国电子科技集团公司第五十四研究所 | A kind of high neighboring trace inhibition radio-frequency transmitter |
| CN109672412A (en) * | 2018-12-13 | 2019-04-23 | 贵州航天电子科技有限公司 | Low-frequency amplifier dynamic range circuit in a kind of control |
-
2016
- 2016-10-12 CN CN201621121819.4U patent/CN206060732U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107222228A (en) * | 2017-07-18 | 2017-09-29 | 上海东软载波微电子有限公司 | Automatic gain control circuit and its control method, receiver |
| CN109412619A (en) * | 2018-12-11 | 2019-03-01 | 中国电子科技集团公司第五十四研究所 | A kind of high neighboring trace inhibition radio-frequency transmitter |
| CN109672412A (en) * | 2018-12-13 | 2019-04-23 | 贵州航天电子科技有限公司 | Low-frequency amplifier dynamic range circuit in a kind of control |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170329 Termination date: 20171012 |