CN107769807A - Radio frequency sampling device - Google Patents
Radio frequency sampling device Download PDFInfo
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- CN107769807A CN107769807A CN201711123666.6A CN201711123666A CN107769807A CN 107769807 A CN107769807 A CN 107769807A CN 201711123666 A CN201711123666 A CN 201711123666A CN 107769807 A CN107769807 A CN 107769807A
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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
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Abstract
The invention discloses a kind of radio frequency sampling device, it is related to signal processing technology field.The radio frequency sampling device includes：RF signal input end mouth and digital signal output port, digital AGC is provided between RF signal input end mouth and digital signal output port, first amplifier, bandpass filter, second amplifier, balun transformer and analog-digital converter, the signal can to L-band with 400MHz signal bandwidths is directly sampled, avoid the radio frequency analog circuit of complexity, reduce hardware cost, for rear end flexibility is improved using software processing direct to high-frequency signal, suitable for big bandwidth communication systems application, digital AGC make it that circuit is simple, it is and simpler flexibly by back-end software control signal gain operation.
Description
Technical field
The present invention relates to signal processing technology field, in particular to a kind of radio frequency sampling device.
Background technology
In L-band (1-2GHz) communications field, receiver radio frequency front end typically using simulation multiple stage downconversion structure, is mixed
Frequency circuit complex designing, and easily produce false frequency and introduce phase error.The method that radio frequency directly samples is to receiving
Radiofrequency signal direct digitization, there is provided handled to follow-up digital circuit.The direct Sampling techniques of radio frequency are avoided to penetrating
Frequency signal is mixed, and signal processing function as much as possible is completed with software, simplifies system architecture, and with required
The advantages of device is few, cost is low, low in energy consumption, easy acquirement higher performance.The patent document of Application No. 201320354916.8
A kind of radio frequency sampling receiver is disclosed, existing L-band receiver is solved and has that processing flexibility is poor, signal is easily trapped
With the technical problem such as volume is larger.Including：The input of limiter (1) receives input signal, and its output port is sequentially connected with low
Noise amplifier (2), broadband filter (3), amplifier one (4), low pass filter one (5), temperature compensation attenuator (6), attenuator
(7), amplifier two (8), low pass filter two (9) and digital signal processing unit (10).Exist sample strip be wider than it is narrow, it is impossible to it is straight
Connect the defects of directly being sampled to 400MHz signal., can be to narrow in the existing disclosed direct Sampling techniques of L-band radio frequency
Bandwidth signal, as 10MHz signal bandwidths, or wider bandwidth signal, such as 200MHz signal bandwidths are sampled, but it is unable to reach pair
The sampling of more high-bandwidth signals.But in some L-band communications applications, signal bandwidth often reaches 300MHz or 400MHz
Even more high, therefore, how the radiofrequency signal progress directly sampling to L-band wide signal bandwidth is asked as technology urgently to be resolved hurrily
Topic.
The content of the invention
It is contemplated that the defects of overcoming prior art directly can not directly be sampled to 400MHz signal, is carried
Go out a kind of new radio frequency sampling device, possess the advantages such as circuit complexity is low, circuit stability is high, hardware cost is low.
A kind of radio frequency sampling device of disclosure of the invention includes：RF signal input end mouth and digital signal output end
Mouthful, be provided between RF signal input end mouth and digital signal output port digital AGC (digital resources obtainment device),
First amplifier, bandpass filter, the second amplifier, balun transformer and analog-digital converter；The input connection of digital AGC
To RF signal input end mouth, output end is connected to the input of the first amplifier, according to the digital controlled signal of input, to penetrating
The multiplication factor of frequency signal is adjusted, and signal power is met the input range of analog-digital converter；The output of first amplifier
End is connected to the input of bandpass filter, and the signal of digital AGC output is amplified；The output end connection of bandpass filter
To the input of the second amplifier so that signal in effective bandwidth is by while shielding the signal in useless bandwidth；Second puts
The output end of big device is connected to the input of balun transformer, and the output signal of bandpass filter is amplified；Balun transformation
The output end of device is connected to the input of analog-digital converter, and radiofrequency signal is converted into both-end differential signal is exported；Modulus
The output end of converter is connected to digital signal output end mouth, and the radiofrequency signal for receiving input is digitized sampling and is output to
Digital signal output end mouth.
According to the above-mentioned technical proposal of the present invention, it is preferable that digital AGC HMC472LP4, substitute simulation AGC, reduce electricity
Road complexity.
According to the above-mentioned technical proposal of the present invention, it is preferable that the first amplifier and the second amplifier are ADL5545, the two
Two-stage amplifying circuit is formed, improves circuit stability.
According to the above-mentioned technical proposal of the present invention, it is preferable that bandpass filter is low pass filter LEQ170.
According to the above-mentioned technical proposal of the present invention, it is preferable that balun transformer is ETC1-1-13 or RFT4042G-1.
According to the above-mentioned technical proposal of the present invention, it is preferable that the front end match circuit of analog-digital converter uses difference transformation
The mode of device coupling plus LPF is driven.
According to the above-mentioned technical proposal of the present invention, it is preferable that analog-digital converter AD9680, support to bandwidth in L-band
400MHz signal is directly sampled.
According to the above-mentioned technical proposal of the present invention, it is preferable that the amplifier bandwidth of digital AGC is not less than 2GHz.
According to the above-mentioned technical proposal of the present invention, it is preferable that the two-stage amplification of the first amplifier and the second amplifier composition
Circuit signal gain is not less than 36dB.
According to the above-mentioned technical proposal of the present invention, it is preferable that the front end match circuit of analog-digital converter uses difference transformation
The mode of device coupling plus LPF is driven.
Radio frequency sampling device circuit complexity provided by the invention is low, circuit stability is high, hardware cost is low, can be to L ripples
The signal that section has 400MHz signal bandwidths is directly sampled, and avoids complicated radio frequency analog circuit, reduce hardware into
This, makes the simpler spirit of operation due to having used digital AGC make it that circuit is simple, and by back-end software control signal gain
It is living, suitable for big bandwidth communication systems application.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the schematic block diagram according to a preferred embodiment of the radio frequency sampling device of the present invention；
Fig. 2 is directly to adopt theory diagram according to the radio frequency of the radio frequency sampling device of the present invention；
Fig. 3 is the digital AGC connection diagram according to a preferred embodiment of the radio frequency sampling device of the present invention；
Fig. 4 is the first amplifier connection diagram according to a preferred embodiment of the radio frequency sampling device of the present invention；
Fig. 5 is the bandpass filter connection diagram according to a preferred embodiment of the radio frequency sampling device of the present invention；
Fig. 6 is the second amplifier connection diagram according to a preferred embodiment of the radio frequency sampling device of the present invention；
Fig. 7 is the balun transformer connection diagram according to a preferred embodiment of the radio frequency sampling device of the present invention；
Fig. 8 is the analog-digital converter connection diagram according to a preferred embodiment of the radio frequency sampling device of the present invention.
Embodiment
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be different from other modes described here using other to implement, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
As shown in figure 1, the embodiment provides a kind of radio frequency sampling device 100, including RF signal input end
Mouth 102 and digital signal output port 116, are set between RF signal input end mouth 102 and digital signal output port 116
There are digital AGC 104, the first amplifier 106, bandpass filter 108, the second amplifier 110, balun transformer 112 and modulus
Converter 114；The input of digital AGC 104 is connected to RF signal input end mouth, and output end is connected to the first amplifier 106
Input, according to the digital controlled signal of input, the multiplication factor of radiofrequency signal is adjusted, signal power is met mould
The input range of number converter 114；The output end of first amplifier 106 is connected to the input of bandpass filter 108, to numeral
The signal that AGC 104 is exported is amplified；The output end of bandpass filter 108 is connected to the input of the second amplifier 110, makes
Signal in effective bandwidth by while shielding the signal in useless bandwidth；The output end of second amplifier 110 is connected to bar
The input of human relations transformer 112, the output signal of bandpass filter 108 is amplified；The output end of balun transformer 112 connects
The input of analog-digital converter 114 is connected to, radiofrequency signal is converted into both-end differential signal is exported；Analog-digital converter 114
Output end be connected to digital signal output end mouth 116, the radiofrequency signal for receiving input is digitized and samples and be output to number
Word signal output port 116.
According to the abovementioned embodiments of the present invention, it is preferable that digital AGC 104 is HMC472LP4, substitutes simulation AGC, reduces
Circuit complexity.
According to the abovementioned embodiments of the present invention, it is preferable that the first amplifier 106 and the second amplifier 110 are ADL5545,
The two composition two-stage amplifying circuit, improves circuit stability.
According to the abovementioned embodiments of the present invention, it is preferable that bandpass filter 108 is low pass filter LEQ170.
According to the abovementioned embodiments of the present invention, it is preferable that balun transformer 112 is ETC1-1-13 or RFT4042G-1.
According to the abovementioned embodiments of the present invention, it is preferable that the front end match circuit of analog-digital converter 114 uses difference transformation
The mode of device coupling plus LPF is driven.
According to the abovementioned embodiments of the present invention, it is preferable that analog-digital converter 114 is AD9680, is supported to bandwidth in L-band
400MHz signal is directly sampled.
According to the abovementioned embodiments of the present invention, it is preferable that the amplifier bandwidth of digital AGC is not less than 2GHz.
According to the abovementioned embodiments of the present invention, it is preferable that the two-stage amplification electricity of the first amplifier and the second amplifier composition
Road signal gain is not less than 36dB.
According to the abovementioned embodiments of the present invention, it is preferable that the front end match circuit of analog-digital converter uses differential transformers
The mode of coupling plus LPF is driven.
As shown in Fig. 2 embodiments of the invention carry and disclose the radio frequency of radio frequency sampling device and directly adopt principle, circuit by
DAGC, AMP1, BPF, AMP2, BALUN and ADC are formed.The input port of circuit is RFIN, and output port is DOUT.RFIN ends
Mouthful it is RF signal input end mouth, DOUT ports are the data signals after the digital sample of output, DAGC, i.e. digital AGC.Its root
According to the digital controlled signal of input, the multiplication factor of radiofrequency signal is adjusted, the input model for making signal power meet ADC
Enclose.The amplifier bandwidth of the digital AGC device of selection should reach 2GHz.AMP1, i.e. the first amplifier.To digital AGC output
Signal is amplified, and is exported to BPF.BPF, i.e. bandpass filter.It may be such that signal in effective bandwidth by while shielding nothing
With the signal in bandwidth.AMP2, i.e. the second amplifier.The signal of BPF outputs is amplified, exports and gives BALUN balun transformations
Device.BALUN, i.e. balun transformer.Input single-ended radio frequency signal is converted into both-end differential signal, exported to ADC.ADC, i.e. mould
Number converter.Sampling is digitized to the radiofrequency signal of input.
In this embodiment, the radio-frequency input signals of L-band is connected to the input port RFIN of this circuit, input port
RFIN is connected to DAGC input port.DAGC output end is connected to AMP1 input, and AMP1 output end is connected to BPF
Input, BPF output end is connected to AMP2 input, and AMP2 output end is connected to BALUN input, BALUN
Output end be connected to ADC input.The type selecting of core devices：Digital AGC selects HMC472LP4.Amplifier is selected
ADL5545.BPF selects LEQ170.Balun Transformer Selection ETC1-1-13/RFT4042G-1.AD selects AD9680.Due to choosing
, can be to L with the high speed of binary channels 14bit, the 1.25GSPS sample rate of ADI companies, high-resolution analog-digital converter AD9680
Bandwidth 400MHz signal is directly sampled in wave band.From LEQ170 low pass filters, digital AGC design is employed, than
Simulation AGC reduces circuit complexity, improves reliability, employs AMP1+BPF+AMP2 two-stage signal Enlargement Design, carry
The high stability of circuit, signal gain can reach 36dB.ADC front end match circuit is using differential transformers coupling plus low pass
The mode of filtering drives ADC.
As shown in figure 3, embodiment of the invention discloses that the specific implementation method of digital AGC, including：The input letter of radio frequency
VGA_IN ports number are connected to, VGA_IN signals are connected to device HMC472LP4 by an electric capacity C1 (capacitance 56pF) of connecting
RF1 ports (port 4).Device HMC472LP4 RF2 ports are connected to VGA_ by an electric capacity C2 (capacitance 56pF) of connecting
OUT terminal mouth, the port are the radio frequency output ports of digital AGC.Device HMC472LP4 port 1 is connected to the ground, and port 2 connects
To+5v direct currents, C25 (capacitance 560pF) is connected in parallel with a capacitor between port 1 and port 2.Device HMC472LP4 port
3rd, 5,12,14,16,17,18,25 it is connected to the ground.Device HMC472LP4 port 6,7,8,9 is all connected to electric capacity C34 (capacitances
Same port 330pF), electric capacity C34 another port are connected to the ground.Device HMC472LP4 port 10 passes through series connection
One electric capacity C35 (capacitance 330pF) is connected to the ground.Device HMC472LP4 port 11 passes through an electric capacity C36 (capacitance of connecting
330pF) it is connected to the ground.Device HMC472LP4 port 13 is connected to the ground by an electric capacity C33 (capacitance 330pF) of connecting.Device
Part HMC472LP4 port 19 is connected to+5v direct currents, R41 by series resistance R6 (Ω of resistance 10) and R41 (Ω of resistance 10)
The port for being connected to+5v direct currents is connected to the ground by an electric capacity C27 (capacitance 56pF) of connecting simultaneously.Device HMC472LP4
Port 20 by connect a resistance R5 be connected to A5 ports.Device HMC472LP4 port 21 passes through a resistance of connecting
R4 is connected to A4 ports.Device HMC472LP4 port 22 is connected to A3 ports by the resistance R3 that connects.Device
HMC472LP4 port 23 is connected to A2 ports by the resistance R2 that connects.Device HMC472LP4 port 24 passes through series connection
One resistance R1 is connected to A1 ports.Port A1, A2, A3, A4, A5 are the digital control ports of outside input.
As shown in figure 4, embodiment of the invention discloses that the specific implementation method of the first amplifier, including：Digital AGC
Output port VGA_OUT is connected to AMP_IN ports, and AMP_IN ports are connected to device ADL5545 port 1.Device
ADL5545 port 2,4 is connected to the ground.Device ADL5545 port 3 is connected to electric capacity C4 (capacitance 56pF) end simultaneously
The a port of mouth and inductance L1 (inductance value 33nH).Electric capacity C4 another port is connected to AMP_OUT ports, and the port is
The radio frequency output port of amplifier.Inductance L1 another port be connected to simultaneously electric capacity C28 (capacitance 56pF) a port,
It is connected to electric capacity C45 (capacitance 1000pF) a port, a port for being connected to electric capacity C41 (capacitance 1uF) and connection
To resistance R13 (Ω of resistance 1) a port.Electric capacity C28, C45, C41 another port are connected to the ground.R13 another
Port is connected to+5v direct currents.
As shown in figure 5, embodiment of the invention discloses that the specific implementation method of bandpass filter, including：First amplification
The output port AMP_OUT of device is connected to BPF_IN ports, and BPF_IN ports are connected to resistance R17's (Ω of resistance 300) simultaneously
The a port of a port and R33 (Ω of resistance 18).Resistance R17 another port is connected to the ground.Resistance R33 another
Port is connected to resistance R18 (Ω of resistance 300) a port and electric capacity C5 (capacitance 56pF) a port simultaneously.Resistance
R18 another port is connected to the ground, and electric capacity C5 another port is connected to device LBQ1700 port 1.Device
LBQ1700 port 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17 is connected to the ground.Device LBQ1700 port 2
Electric capacity C6 (capacitance 56pF) a port is connected to, electric capacity C6 another port is connected to resistance R19 (resistances 300 simultaneously
A port and a port of resistance R34 (Ω of resistance 18) Ω).Resistance R19 another port is connected to the ground.Resistance
R34 another port be connected to simultaneously resistance R20 (Ω of resistance 300) a port and one of electric capacity C7 (capacitance 56pF)
Port.Resistance R20 another port is connected to the ground.Electric capacity C7 another port is connected to output port BPF_OUT.
As shown in fig. 6, embodiment of the invention discloses that the specific implementation method of the second amplifier, including：BPF output
Port BPF_OUT is connected to AMP_IN ports, and AMP_IN ports are connected to device ADL5545 port 1.Device ADL5545's
Port 2,4 is connected to the ground.Device ADL5545 port 3 is connected to electric capacity C8 (capacitance 56pF) a port and inductance simultaneously
L2 (inductance value 33nH) a port.Electric capacity C8 another port is connected to AMP_OUT ports, and the port is amplifier
Radio frequency output port.Inductance L2 another port is connected to electric capacity C29 (capacitance 56pF) a port, is connected to electricity simultaneously
Hold C46 (capacitance 1000pF) a port, be connected to electric capacity C42 (capacitance 1uF) a port and be connected to resistance
R14 (Ω of resistance 1) a port.Electric capacity C29, C46, C42 another port are connected to the ground.R14 another port connects
It is connected to+5v direct currents.
As shown in fig. 7, embodiment of the invention discloses that the specific implementation method of balun transformer, including the second amplifier
Output port AMP_OUT be connected to the input port MIF1_RX_OUT of balun transformer, input port MIF1_RX_OUT connects
Resistance R34 (Ω of resistance 0) a port is connected to, another port of resistance R34 is connected to resistance R397 (resistances 49.9 simultaneously
Ω) a port and device ETC1-1-13/RFT4042G-1 port 4.Resistance R397 another port is connected to the ground.Device
Part ETC1-1-13/RFT4042G-1 (T5) port 5 is connected to the ground, and device ETC1-1-13/RFT4042G-1 port 1 is simultaneously
It is connected to device ETC1-1-13/RFT4042G-1 (T7) port 5 and electric capacity C296 (capacitance 0.1uF) a port.Device
ETC1-1-13/RFT4042G-1 (T5) port 2 is hanging.Device ETC1-1-13/RFT4042G-1 (T5) port 3 connects simultaneously
It is connected to device ETC1-1-13/RFT4042G-1 (T7) port 3 and electric capacity C332 (0.1uF) a port.Device ETC1-
1-13/RFT4042G-1 (T7) port 1 is connected to the ground, and device ETC1-1-13/RFT4042G-1 (T7) port 2 is hanging, device
Part ETC1-1-13/RFT4042G-1 (T7) port 4 is connected to the ground.Electric capacity C296 another port is connected to resistance R192
The a port of (Ω of resistance 10), resistance R192 another port are connected to one of resistance R368 (Ω of resistance 49.9) simultaneously
The a port of port and electric capacity C536 (capacitance 4pF) a port and resistance R197 (Ω of resistance 10).Electric capacity C332's
Another port is connected to resistance R198 (Ω of resistance 10) a port, and resistance R198 another port is connected to electricity simultaneously
Hinder R353 (Ω of resistance 49.9) a port and electric capacity C537 (capacitance 4pF) a port and resistance R191 (resistances 10
A port Ω).Resistance R368 another port and resistance R353 another port are connected to electric capacity C299 and (held simultaneously
Value 0.1uF) a port, electric capacity C299 another port is connected to the ground.Another port of electric capacity C536 and electric capacity C537
Another port be connected to the ground.Resistance R197 another port is connected to electric capacity C523 (capacitance 2pF) end simultaneously
Mouth and port ADC_VIN_An, resistance R191 another port are connected to electric capacity C523 another port and port simultaneously
ADC_VIN_Ap.Port ADC_VIN_An and port ADC_VIN_Ap is the difference output port of balun transformer.
As shown in figure 8, embodiment of the invention discloses that the specific implementation method of analog-digital converter, including device
AD9680BCPZ-1000 port 1,2,47,48,49,52,55,61,64 connects 1.25V direct currents.Device AD9680BCPZ-
1000 port 57 connects 1.25V direct currents.Device AD9680BCPZ-1000 port 3,8,9,10,11,39,40,41,46,
50th, 51,62,63 connection 2.5V direct currents.Device AD9680BCPZ-1000 port 4,7,42,45 connects 3.3V direct currents.Device
Part AD9680BCPZ-1000 port 15,34 connects 1.25V direct currents.Device AD9680BCPZ-1000 port 13,38 connects
Connect 1.8V direct currents.Device AD9680BCPZ-1000 port 6 is connected to the output terminals A DC_VIN_An of Fig. 7 balun transformers.
Device AD9680BCPZ-1000 port 5 is connected to the output terminals A DC_VIN_Ap of Fig. 7 balun transformers.Device
AD9680BCPZ-1000 port 43 and port 44 are another group of difference radio-frequency signal input ports, in this embodiment only to one
Group difference radio-frequency signal sampling, therefore port ADC_VIN_Bn and ADC_VIN_Bn are not connected to any signal.Device
AD9680BCPZ-1000 port 12 is connected to electric capacity C375 (capacitance 0.1uF) one end, and the electric capacity C375 other end is connected to
Ground.Device AD9680BCPZ-1000 port 54 is connected to port ADC_CLK_N, device AD9680BCPZ-1000 port 53
Port ADC_CLK_P is connected to, port ADC_CLK_N and ADC_CLK_P are differential clocks inputs.Device AD9680BCPZ-
1000 port 37 is connected to port ADC_SPI_1V8_CSn, and device AD9680BCPZ-1000 port 36 is connected to port
ADC_SPI_1V8_SCLK, device AD9680BCPZ-1000 port 35 are connected to port ADC_SPI_1V8_SDIO, port
ADC_SPI_1V8_CSn, ADC_SPI_1V8_SCLK, ADC_SPI_1V8_SDIO are the configuration ports to the device.Device
AD9680BCPZ-1000 port 59 is connected to port ADC_SYSREF_N, and device AD9680BCPZ-1000 port 58 connects
To port ADC_SYSREF_P.Device AD9680BCPZ-1000 port 20 is connected to port ADC_SYNCINn, device
AD9680BCPZ-1000 port 58 is connected to port ADC_SYNCINp.Device AD9680BCPZ-1000 port 22,23,
24th, 25,26,27,28,29 port ADC_SERDOUTn0, ADC_SERDOUTp0, ADC_SERDOUTn1, ADC_ are connected respectively to
SERDOUTp1, ADC_SERDOUTn2, ADC_SERDOUTp2, ADC_SERDOUTn3, ADC_SERDOUTp3, these ports are
The device quantifies the digital output end after sampling to analog signal.Device AD9680BCPZ-1000 port 17 is connected to port
ADC_1V8_FD_A, device AD9680BCPZ-1000 port 32 are connected to port ADC_1V8_FD_B.Device
AD9680BCPZ-1000 port 14 is connected to port ADC_1V8_PDWN.Device AD9680BCPZ-1000 port 56 connects
To ADC_AGNDSR.Device AD9680BCPZ-1000 port 18,31,16,33,60,65 is connected to ground.
It can be seen from above-mentioned each embodiment, radio frequency sampling device disclosed by the invention has selected the binary channels of ADI companies
The high speed of 14bit, 1.25GSPS sample rate, high-resolution analog-digital converter AD9680, can be to the letter of bandwidth 400MHz in L-band
Number directly sampled, employ digital AGC design, reduced circuit complexity than simulation AGC, improve reliability, use
The two-stage signal Enlargement Designs of amplifier 1+BPF+ amplifiers 2, improves the stability of circuit, and signal gain can reach
36dB, the signal can to L-band with 400MHz signal bandwidths are directly sampled, and avoid the radio frequency analog circuit of complexity,
Hardware cost is reduced, flexibility is improved using software processing direct to high-frequency signal for rear end, suitable for big bandwidth communication
System application.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of radio frequency sampling device, including RF signal input end mouth and digital signal output port, it is characterised in that：
Digital AGC, the first amplifier, band logical are provided between the RF signal input end mouth and digital signal output port
Wave filter, the second amplifier, balun transformer and analog-digital converter；
The input of the digital AGC is connected to the RF signal input end mouth, and output end is connected to first amplifier
Input, according to the digital controlled signal of input, the multiplication factor of radiofrequency signal is adjusted, signal power is met institute
State the input range of analog-digital converter；
The output end of first amplifier is connected to the input of the bandpass filter, to the letter of digital AGC output
Number it is amplified；
The output end of the bandpass filter is connected to the input of second amplifier so that the signal in effective bandwidth leads to
Cross, while shield the signal in useless bandwidth；
The output end of second amplifier is connected to the input of the balun transformer, the output to the bandpass filter
Signal is amplified；
The output end of the balun transformer is connected to the input of the analog-digital converter, and it is poor that radiofrequency signal is converted into both-end
Sub-signal is exported；
The output end of the analog-digital converter is connected to the digital signal output end mouth, and the radiofrequency signal for receiving input enters line number
Wordization samples and is output to the digital signal output end mouth.
2. radio frequency sampling device according to claim 1, it is characterised in that the digital AGC is HMC472LP4, is substituted
AGC is simulated, reduces circuit complexity.
3. radio frequency sampling device according to claim 1, it is characterised in that first amplifier and second amplification
Device is ADL5545, the two composition two-stage amplifying circuit, improves circuit stability.
4. radio frequency sampling device according to claim 1, it is characterised in that the bandpass filter is low pass filter
LEQ170。
5. radio frequency sampling device according to claim 1, it is characterised in that the balun transformer be ETC1-1-13 or
RFT4042G-1。
6. radio frequency sampling device according to claim 1, it is characterised in that the front end match circuit of the analog-digital converter
It is driven by the way of differential transformers coupling plus LPF.
7. radio frequency sampling device according to claim 2, it is characterised in that the amplifier bandwidth of the digital AGC is not small
In 2GHz.
8. radio frequency sampling device according to claim 3, it is characterised in that first amplifier and second amplification
The two-stage amplifying circuit signal gain of device composition is not less than 36dB.
9. radio frequency sampling device according to claim 6, it is characterised in that the analog-digital converter is AD9680, is supported
The signal of bandwidth 400MHz in L-band is directly sampled.
10. radio frequency sampling device according to claim 9, it is characterised in that the front end matching electricity of the analog-digital converter
Road is driven by the way of differential transformers coupling plus LPF.
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| CN201711123666.6A CN107769807A (en) | 2017-11-14 | 2017-11-14 | Radio frequency sampling device |
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| CN108988884A (en) * | 2018-08-28 | 2018-12-11 | 中国科学院电子学研究所 | High bandwidth Larger Dynamic range equivalent sampling receiver |
| CN113114291A (en) * | 2021-04-01 | 2021-07-13 | 中国空空导弹研究院 | Reconfigurable dual-channel digital receiver radio frequency front-end device |
| CN118484127A (en) * | 2024-07-16 | 2024-08-13 | 中国科学院上海高等研究院 | Integrated radio frequency direct sampling processor for cavity type probe beam current signal |
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Application publication date: 20180306 |