CN106411343A - Direct sampling based receiver RF front-end processing circuit and receiver - Google Patents
Direct sampling based receiver RF front-end processing circuit and receiver Download PDFInfo
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- CN106411343A CN106411343A CN201611024783.2A CN201611024783A CN106411343A CN 106411343 A CN106411343 A CN 106411343A CN 201611024783 A CN201611024783 A CN 201611024783A CN 106411343 A CN106411343 A CN 106411343A
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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
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Abstract
The invention discloses a direct sampling based receiver RF front-end processing circuit and a receiver. The receiver RF front-end processing circuit comprises a control circuit, and a channel selection module, an attenuation module, a pre-selected filtering group module and an amplification module connected with the control circuit; the channel selection module receives RF signals and self-check signals, and under the effect of a control level generated by the control circuit, the channel selection module outputs RF or self-check signal selectively; under the effect of the control level generated by the control circuit, the attenuation module attenuates signals output by the channel selection module quantitatively; the pre-selected filtering group module includes a switch filter group of a square formation type channel, and receives control level generated by the control circuit to select a filtering channel of a corresponding frequency range, and realizes pre-selected filtering of the signals after quantitative attenuation; and under the effect of the control level generated by the control circuit, the amplification module amplifies the signals after pre-selected filtering and outputs the amplified signals.
Description
Technical field
The invention belongs to receiver radio frequency front end processing techniques field, more particularly, to a kind of receiver based on directly sampling
Radio-frequency front-end process circuit and receiver.
Background technology
The radio-frequency front-end of receiver is the important component part of receiver, determine the sensitivity of receiver, noise coefficient,
The Key Performance Indicators such as second-order intercept point, three rank sections.Receiver can be divided into superhet, zero intermediate frequency according to topological structure difference
Formula, mirror image suppressed FCM and several main structure of digital intermediate frequency formula, directly can also be carried out to the radiofrequency signal of input in addition
AD sampling is changed into digital signal and digital signal is processed again.
Existing superheterodyne receiver first carries out pre-selection filtering to the radiofrequency signal receiving, then is mixed to fixed intermediate frequency,
Finally carry out the control of intermediate-frequency gain；The local oscillator of zero intermediate frequency formula receiver is equal with signal frequency, becomes directly lower for radiofrequency signal
Frequency arrives zero intermediate frequency, solves the problems, such as the Image interference of superheterodyne receiver；Mirror image suppressed FCM receiver passes through Hartley structure
To suppress the interference of image frequency with Weaver structure；Digital intermediate frequency formula receiver is on the basis of secondary mixing by after mixing
Signal digitized；Short-wave receiver can also directly carry out AD sampling after conditioning to the radiofrequency signal receiving and be changed into numeral
Carry out Treatment Analysis after signal.
But, superheterodyne receiver：There is Image interference；Circuit structure is complicated, and debugging difficulty is big, and components and parts are relatively
Many, volume is difficult to greatly integrated, the also big problem of power consumption；Zero intermediate frequency formula receiver：Because local frequency is identical with signal frequency, meeting
The problems such as local oscillator leakage, DC shift and flicker noise, occurs, necessarily requires two-way local oscillation signal strict orthogonal in addition；Mirror image presses down
Standard receiver：Two branch roads are completely the same, and the amplitude of orthogonal local oscillation signal and phase place have mismatch problems；Digital intermediate frequency formula connects
Receipts machine：There is the defect of superheterodyne receiver.
The short-wave receiver RF front-end circuit design of existing at present direct sampling is as shown in figure 1, as can be seen from Figure 1：
Signal enters LNA low-noise amplifier after antenna reception and is amplified, and enters electrically regulated filtering module afterwards in control circuit
It is filtered under control processing, enter AGC controllable gain broadband amplifier after filtering interference signals and amplify signal power further,
Finally enter A/D module to be sampled, DDC module Digital Down Convert, DSP module Digital Signal Processing.
This scheme to frequency the short-wave signal for 3MHz～30MHz carry out receive analysis short-wave receiver exist ask
Topic：Due to the undamped module of receiver front end, so the maximal input allowing is limited；Receipt signal frequency range is 3MHz
Low frequency signals less than 3MHz cannot be normally received analysis by～30MHz；Radio-frequency front-end signal through twice amplify after, line
Property degree is limited to dual-stage amplifier.
Content of the invention
In order to solve the shortcoming of prior art, the first object of the present invention is to provide a kind of controllable attenuation circuit.
A kind of controllable attenuation circuit of the present invention includes decay branch road and the direct current branch being connected in parallel；Described decay branch road
It is connected with control circuit respectively with direct current branch, control circuit is used for controlling one in decay branch road and this two branch roads of direct current branch
Bar branch road turns on, and another branch road disconnects.
This controllable attenuation circuit structure of the present invention is simply it is only necessary to control decay branch road in the presence of control circuit
To realize signal attenuation with any bar branch road conducting in direct current branch still to lead directly to.When the input signal of attenuator circuit is 9kHz
Frequency compared with low signal it is contemplated that the frequency characteristic present invention of device does not carry out branch road selection from switch, but by low
The preferable diode of frequency characteristic carrys out controlling brancher and selects.Wherein, control circuit also sets up big inductance LC filter circuit to filter
The interference to radiofrequency signal for the control level.
Wherein, control circuit is available circuit structure, and it can be achieved using control chip, controls letter for producing
Number.
Further, described control circuit output first control level and the second control level；Described decay branch road includes
Damping resistance, the two ends of described damping resistance are connected with the anode of the first diode and the second diode respectively；Described direct current props up
Road includes the first electric capacity, and the two ends of described first electric capacity are connected with the anode of the 3rd diode and the 4th diode respectively；Described
Equal first control level of negative electrode of the first diode and the second diode is connected；Described 3rd diode and the moon of the 4th diode
Extremely equal second control level is connected.
This attenuator circuit of the present invention constitutes decay branch road and direct current branch using damping resistance respectively and electric capacity, respectively
At the two ends of these branch roads, diode is set so that the control level in control circuit output to control decay branch road and direct current to prop up
Any bar branch road in road turns on and still leads directly to realizing signal attenuation, realize decay or straight-through arbitrarily select, it is right finally to meet
Multiple demands of input signal pretreatment.
The second object of the present invention is to provide a kind of amplification control circuit.
A kind of amplification control circuit of the present invention, including the amplification branch road being connected in parallel and direct current branch；Described amplification props up
Road is connected with control circuit respectively with direct current branch, and control circuit is used for controlling and amplifies in branch road and this two branch roads of direct current branch
Article one, branch road conducting, another branch road disconnects.
This amplification control circuit structure of the present invention is simply it is only necessary to control amplification branch road in the presence of control circuit
Turn on to realize signal amplification or to lead directly to any bar branch road in direct current branch, realize amplifying or lead directly to arbitrarily selection,
Meet the multiple demands to input signal pretreatment eventually.
Further, described control circuit output the 3rd control level and the 4th control level；Described amplification branch road includes
Amplifier, the two ends of described amplifier are connected with the anode of the 5th diode and the 6th diode respectively；Described direct current branch bag
Include the second electric capacity, the two ends of described first electric capacity are connected with the anode of the 7th diode and the 8th diode respectively；Described 5th
Equal 3rd control level of negative electrode of diode and the 6th diode is connected；The negative electrode of described 7th diode and the 8th diode is equal
4th control level is connected.
This amplification control circuit of the present invention constitutes amplification branch road and direct current branch using amplifier respectively and electric capacity, point
At the two ends of these branch roads, diode is not set so that the control level in control circuit output to control amplification branch road and direct current
Any bar branch road in branch road turns on to be realized signal amplification or to lead directly to.
The third object of the present invention provides a kind of receiver radio frequency front-end processing circuit based on directly sampling.The present invention's
The purpose of radio-frequency front-end is to carry out radio frequency conditioning to input signal, also eliminates the need for image frequency due to not comprising frequency-variable module
Interference, does not have such problems as local oscillator leakage, DC shift yet, and structure simply eliminates the design debugging of local oscillator module, significantly
Simplify the structure of radio-frequency front-end.The receiver of the present invention eliminates the interference of image frequency, also there is not local oscillator leakage, direct current
The problems such as drift.
The receiver radio frequency front-end processing circuit based on directly sampling of the present invention, including control circuit, described control electricity
Road is connected with channel selecting module, attenuation module, pre-selection filtering group module and amplification module respectively；
Channel selecting module, it receives radiofrequency signal and self-test signal, and the control level producing in described control circuit
Under effect, select radiofrequency signal or self-test signal output；
Attenuation module, it is used under the control level effect that described control circuit produces, and channel selecting module is exported
Signal carry out quantitative decay；
Described pre-selection filtering group module comprises the switch filter group of a box formation passage, for receiving described control
The filtering channel to select corresponding band for the control level that circuit produces, thus realize the pre-selection filter to the signal after quantitative decay
Ripple；
Amplification module, it is used under the control level effect that described control circuit produces, and the signal of pre-selection filtering is entered
Row is quantitative to be amplified and exports.
The present invention passes through the combination of controllable attenuation-controlled amplification, can greatly increase the work(to receipt signal for the radio-frequency front-end
Rate disposal ability, such that it is able to meet wider power input, makes receiver have big dynamic range.Work as input signal power
A certain amount of decay first can be carried out to signal by attenuation module when larger, so can improve the treatable maximum of receiver
Signal power；Can be that attenuation module is operated in pass-through state when input signal power is less, reduce receipt signal as far as possible
Power attenuation is so that late-class circuit being capable of normal work.
Further, channel selecting module is relay or alternative numerical selector.Relay can be by being applied to
In the control circuit of automatization, it is to go to control one kind " automatic switch " of high current running with small current, plays in circuit
Automatically adjust, safeguard protection, change-over circuit effect.Alternative numerical selector can select input signal exactly.
Described attenuation module is made up of the controllable attenuation circuit of one-level controllable attenuation circuit or at least two-stage series connection connection.Root
According to the requirement to signal amplitude, attenuation module could be arranged to one-level controllable attenuation circuit, could be arranged to plural serial stage and connects
Controllable attenuation circuit, wherein multistage is at least two-stage.
Wherein, controllable attenuation circuit includes the decay branch road being connected in parallel and direct current branch；Described decay branch road and direct current
Branch road is connected with control circuit respectively, and control circuit is used for controlling a branch road in decay branch road and this two branch roads of direct current branch
Conducting, another branch road disconnects.
Control circuit output first control level and the second control level；Described decay branch road includes damping resistance, described
The two ends of damping resistance are connected with the anode of the first diode and the second diode respectively；Described direct current branch includes the first electricity
Hold, the two ends of described first electric capacity are connected with the anode of the 3rd diode and the 4th diode respectively；Described first diode and
Equal first control level of negative electrode of the second diode is connected；Equal second control of negative electrode of described 3rd diode and the 4th diode
Level is connected.
The frequency that the present invention can receive analysis 9kHz compared with low signal and has high linearity and low insertion loss, due to receiving
Signal low-limit frequency be 9kHz it is contemplated that the frequency characteristic of device does not carry out branch road selection from switch here, but logical
Cross the preferable diode of low frequency characteristic and carry out controlling brancher selection, control circuit also sets up inductance LC filter circuit to filter control
The interference to radiofrequency signal for the level.
The amplification control circuit that described amplification module comprises one-level amplification control circuit or at least two-stage series connection connects.So
On the one hand it is used for meeting the requirement to input signal amplitude, be on the other hand used for meeting the requirement to input signal bandwidth.
Described amplification control circuit includes：The amplification branch road being connected in parallel and direct current branch；Described amplification branch road and direct current
Branch road is connected with control circuit respectively, and control circuit is used for controlling amplifies a branch road in branch road and this two branch roads of direct current branch
Conducting, another branch road disconnects.
Described control circuit output the 3rd control level and the 4th control level；Described amplification branch road includes amplifier, institute
The two ends stating amplifier are connected with the anode of the 5th diode and the 6th diode respectively；Described direct current branch includes the second electricity
Hold, the two ends of described first electric capacity are connected with the anode of the 7th diode and the 8th diode respectively；Described 5th diode and
Equal 3rd control level of negative electrode of the 6th diode is connected；Equal 4th control of negative electrode of described 7th diode and the 8th diode
Level is connected.
This receiver radio frequency front-end processing circuit also includes the low-pass filtering module being connected in series and AD sampling module, described
The outfan of low-pass filtering module is connected with the outfan of amplification module.
The low-pass filtering module of the present invention is filtered to the signal of amplified process, sends into AD and adopt after filtering interference signals
Sample.AD sampling can directly be carried out to signal after being low-pass filtered, this is different from the scheme comprising frequency-variable module, due to not wrapping
Also eliminate the need for the interference of image frequency containing frequency-variable module, also there is no local oscillator leakage, DC shift, and structure is simple
Eliminate the design debugging of local oscillator module, enormously simplify the structure of radio-frequency front-end.
The fourth object of the present invention is to provide a kind of receiver.
A kind of receiver of the present invention, including the receiver radio frequency front-end processing circuit based on directly sampling.
Receiver also includes DDS self-inspection generation module, and described DDS self-inspection generation module is used for producing self-test signal and inputting
To channel selecting module.
Beneficial effects of the present invention are：
1) the receiver radio frequency front-end processing circuit dynamic range based on directly sampling is big：Put by controllable attenuation-controlled
Big combination, can greatly increase the power handling capability to receipt signal for the radio-frequency front-end, such that it is able to meet wider power
Input, makes receiver have big dynamic range.First signal can be entered by attenuation module when input signal power is larger
A certain amount of decay of row, so can improve the treatable maximum signal power of receiver；Can when input signal power is less
To be that attenuation module is operated in pass-through state, reduce the power attenuation of receipt signal so that late-class circuit being capable of normal work as far as possible
Make；Controllable attenuation module comprises at least level adjustable attenuation, and the compound mode advantage of this cascade is to can achieve straight-through, multiple decay
The same attenuation processing of dB, makes the attenuation that the signal receiving obtains optimum select.
2) frequency of analysis 9kHz can be received compared with low signal based on the receiver radio frequency front-end processing circuit of direct sampling
And there is high linearity and low insertion loss：Signal low-limit frequency due to receiving is 9kHz it is contemplated that the frequency characteristic of device
Here do not carry out branch road selection from switch, but selected come controlling brancher by the preferable diode of low frequency characteristic, control
Big inductance LC filter circuit is placed on circuit to filter the interference to radiofrequency signal for the control level；By from low insertion loss
Diode can realize the low insertion loss of radio-frequency front-end, the linearity that the passive device of attenuation module has had, amplification module
From the amplifier of high linearity, therefore make the linearity that receiver has had.
3) the receiver radio frequency front-end processing circuit scanning speed based on directly sampling is fast：Radio-frequency front-end modules are all adopted
Carry out controlling brancher with switch to select, improve scanning speed.Attenuation module and amplification module are used diode as switch, pre-selection filter
Ripple device group to realize being switched fast of passage using on-off mode, thus improve the scanning speed of receiver.
Brief description
Fig. 1 is the short-wave receiver scheme block diagram of traditional a kind of direct sampling；
Fig. 2 is the receiver radio frequency front-end architecture block diagram of the direct sample mode of the present invention；
Fig. 3 is the controllable attenuation circuit diagram of the present invention；
Fig. 4 is the amplification control circuit figure of the present invention.
Specific embodiment
The present invention will be further described with embodiment below in conjunction with the accompanying drawings：
The control circuit of the present invention is available circuit structure, and it can be achieved using control chip, for producing control
Signal.
Fig. 3 is the controllable attenuation circuit diagram of the present invention.
A kind of controllable attenuation circuit of the present invention includes decay branch road and the direct current branch being connected in parallel；Described decay branch road
It is connected with control circuit respectively with direct current branch, control circuit is used for controlling one in decay branch road and this two branch roads of direct current branch
Bar branch road turns on, and another branch road disconnects.
This controllable attenuation circuit structure of the present invention is simply it is only necessary to control decay branch road in the presence of control circuit
To realize signal attenuation with any bar branch road conducting in direct current branch still to lead directly to.When the input signal of attenuator circuit is 9kHz
Frequency compared with low signal it is contemplated that the frequency characteristic present invention of device does not carry out branch road selection from switch, but by low
The preferable diode of frequency characteristic carrys out controlling brancher and selects.Wherein, control circuit also sets up big inductance LC filter circuit to filter
The interference to radiofrequency signal for the control level.
Wherein, control circuit is available circuit structure, and it can be achieved using control chip, controls letter for producing
Number.
Further, described control circuit output first control level and the second control level；Described decay branch road includes
Damping resistance, the two ends of described damping resistance are connected with the anode of the first diode and the second diode respectively；Described direct current props up
Road includes the first electric capacity, and the two ends of described first electric capacity are connected with the anode of the 3rd diode and the 4th diode respectively；Described
Equal first control level of negative electrode of the first diode and the second diode is connected；Described 3rd diode and the moon of the 4th diode
Extremely equal second control level is connected.
The operation principle of controllable attenuation circuit as shown in Figure 3 is：
After signal input through capacitance C1 then select walk decay branch road still lead directly to branch road, walk which bar prop up route control
Level processed determines, if control level 1 is high level, control level 2 is negative level, and diode V1 anode is positive level, and negative pole connects
Ground, diode V1 turns on, and diode V2 anode is positive level, minus earth, diode V2 conducting decay branch road conducting；Diode
V3 anode is negative level, minus earth, and diode V3 ends, and diode V4 anode is negative level, minus earth, and diode V4 cuts
Only, straight-through branch road cut-off.In the same manner, if control level 1 is low level, control level 2 is high level, then the cut-off of decay branch road, directly
Logical branch road conducting.Decay path or through path are selected come control signal by control level 1 and control level 2.C11、
C12, C13 are capacitance, are used for excluding DC voltage.In decay branch road, the attenuator built by resistance is realizing to letter
Number quantitation decay, by change resistance can realize different amounts of decay.
This attenuator circuit of the present invention constitutes decay branch road and direct current branch using damping resistance respectively and electric capacity, respectively
At the two ends of these branch roads, diode is set so that the control level in control circuit output to control decay branch road and direct current to prop up
Any bar branch road in road turns on and still leads directly to realizing signal attenuation, realize decay or straight-through arbitrarily select, it is right finally to meet
Multiple demands of input signal pretreatment.
Fig. 4 is the amplification control circuit figure of the present invention.
A kind of amplification control circuit of the present invention, including the amplification branch road being connected in parallel and direct current branch；Described amplification props up
Road is connected with control circuit respectively with direct current branch, and control circuit is used for controlling and amplifies in branch road and this two branch roads of direct current branch
Article one, branch road conducting, another branch road disconnects.
This amplification control circuit structure of the present invention is simply it is only necessary to control amplification branch road in the presence of control circuit
Turn on to realize signal amplification or to lead directly to any bar branch road in direct current branch, realize amplifying or lead directly to arbitrarily selection,
Meet the multiple demands to input signal pretreatment eventually.
Further, described control circuit output the 3rd control level and the 4th control level；Described amplification branch road includes
Amplifier, the two ends of described amplifier are connected with the anode of the 5th diode and the 6th diode respectively；Described direct current branch bag
Include the second electric capacity, the two ends of described first electric capacity are connected with the anode of the 7th diode and the 8th diode respectively；Described 5th
Equal 3rd control level of negative electrode of diode and the 6th diode is connected；The negative electrode of described 7th diode and the 8th diode is equal
4th control level is connected.
The operation principle of amplification control circuit as shown in Figure 4 is：
Then select to walk to amplify branch road still straight-through branch road through capacitance after signal input, walk which bar props up route test
Level determines, if control level 3 is high level, control level 4 is negative level, and diode V5 anode is positive level, minus earth,
Diode V5 turns on, and diode V6 anode is positive level, minus earth, and branch road conducting is amplified in diode V6 conducting；Diode V7
Anode is negative level, minus earth, and diode V8 ends, and diode V8 anode is negative level, minus earth, and diode V8 cuts
Only, straight-through branch road cut-off.In the same manner, if control level 3 is low level, control level 4 is high level, then amplify branch road cut-off, directly
Logical branch road conducting.Select to amplify path or through path come control signal by control level 3 and control level 4.C21、
C22, C23 are capacitance, are used for excluding DC voltage.
This amplification control circuit structure of the present invention is simply it is only necessary to control amplification branch road in the presence of control circuit
Turn on to realize signal amplification or to lead directly to any bar branch road in direct current branch, realize amplifying or lead directly to arbitrarily selection,
Meet the multiple demands to input signal pretreatment eventually.
Fig. 2 is the receiver radio frequency front-end architecture block diagram of the direct sample mode of the present invention.One kind as shown in Figure 2 is based on
Directly sampling receiver radio frequency front-end processing circuit, including control circuit, described control circuit respectively with channel selecting module,
Attenuation module, pre-selection filtering group module are connected with amplification module.
Wherein, channel selecting module, it receives radiofrequency signal and self-test signal, and the control producing in described control circuit
Under level effect, select radiofrequency signal or self-test signal output；
Attenuation module, it is used under the control level effect that described control circuit produces, and channel selecting module is exported
Signal carry out quantitative decay；
Described pre-selection filtering group module comprises the switch filter group of a box formation passage, for receiving described control
The filtering channel to select corresponding band for the control level that circuit produces, thus realize the pre-selection filter to the signal after quantitative decay
Ripple；
Amplification module, it is used under the control level effect that described control circuit produces, and the signal of pre-selection filtering is entered
Row is quantitative to be amplified and exports.
The present invention passes through the combination of controllable attenuation-controlled amplification, can greatly increase the work(to receipt signal for the radio-frequency front-end
Rate disposal ability, such that it is able to meet wider power input, makes receiver have big dynamic range.Work as input signal power
A certain amount of decay first can be carried out to signal by attenuation module when larger, so can improve the treatable maximum of receiver
Signal power；Can be that attenuation module is operated in pass-through state when input signal power is less, reduce receipt signal as far as possible
Power attenuation is so that late-class circuit being capable of normal work.
Preferably, radiofrequency signal is 9kHz～32MHz.
Preferably, channel selecting module is relay or alternative numerical selector.
Attenuation module is made up of at least one-level controllable attenuation circuit connected in series.In the present embodiment, attenuation module is from by two-stage level
Controllable attenuation circuit connected in series forms, and can realize the decay of 10dB and 20dB respectively, taking 10dB decay as a example, concrete methods of realizing
As shown in Figure 3：
Control circuit output first control level and the second control level；Controllable attenuation circuit includes the decay being connected in parallel
Branch road and direct current branch；Described decay branch road includes damping resistance, the two ends of described damping resistance respectively with the first diode and
The anode of the second diode is connected；Described direct current branch includes the first electric capacity, and the two ends of described first electric capacity are respectively with the three or two
Pole pipe is connected with the anode of the 4th diode；The equal first control level phase of negative electrode of described first diode and the second diode
Even；Equal second control level of negative electrode of described 3rd diode and the 4th diode is connected.
The operation principle of controllable attenuation circuit is：
After signal input through capacitance C1 then select walk decay branch road still lead directly to branch road, walk which bar prop up route control
Level processed determines, if control level 1 is high level, control level 2 is negative level, and diode V1 anode is positive level, and negative pole connects
Ground, diode V1 turns on, and diode V2 anode is positive level, minus earth, diode V2 conducting decay branch road conducting；Diode
V3 anode is negative level, minus earth, and diode V3 ends, and diode V4 anode is negative level, minus earth, and diode V4 cuts
Only, straight-through branch road cut-off.In the same manner, if control level 1 is low level, control level 2 is high level, then the cut-off of decay branch road, directly
Logical branch road conducting.Decay path or through path are selected come control signal by control level 1 and control level 2.C11、
C12, C13 are capacitance, are used for excluding DC voltage.In decay branch road, the attenuator built by resistance is realizing to letter
Number quantitation decay, by change resistance can realize different amounts of decay.
The frequency that the present invention can receive analysis 9kHz compared with low signal and has high linearity and low insertion loss, due to receiving
Signal low-limit frequency be 9kHz it is contemplated that the frequency characteristic of device does not carry out branch road selection from switch here, but logical
Cross the preferable diode of low frequency characteristic and carry out controlling brancher selection, control circuit is placed big inductance LC filter circuit to filter control
The interference to radiofrequency signal for the level.
Wherein, amplification module comprises at least one-level amplification control circuit.The present embodiment comprises two-stage with amplification module and amplifies
As a example control circuit, every grade of amplification control circuit comprises two branch roads, and a branch road leads directly to signal, and another branch road produces to signal
Raw a certain amount of amplification, produces control level 3 by control circuit and control level 4 controls according to the watt level of input signal
Which bar branch road signal walks.Concrete methods of realizing is as shown in Figure 4：
Described amplification control circuit includes：Including the amplification branch road being connected in parallel and straight-through branch road；
The amplification branch road being connected in parallel and direct current branch；Described amplification branch road includes amplifier, and the two of described amplifier
End is connected with the anode of the 5th diode and the 6th diode respectively；Described direct current branch includes the second electric capacity, described first electricity
The two ends holding are connected with the anode of the 7th diode and the 8th diode respectively；Described 5th diode and the moon of the 6th diode
Extremely equal 3rd control level is connected；Equal 4th control level of negative electrode of described 7th diode and the 8th diode is connected.
The operation principle of amplification control circuit is：
Then select to walk to amplify branch road still straight-through branch road through capacitance after signal input, walk which bar props up route test
Level determines, if control level 3 is high level, control level 4 is negative level, and diode V5 anode is positive level, minus earth,
Diode V5 turns on, and diode V6 anode is positive level, minus earth, and branch road conducting is amplified in diode V6 conducting；Diode V7
Anode is negative level, minus earth, and diode V8 ends, and diode V8 anode is negative level, minus earth, and diode V8 cuts
Only, straight-through branch road cut-off.In the same manner, if control level 3 is low level, control level 4 is high level, then amplify branch road cut-off, directly
Logical branch road conducting.Select to amplify path or through path come control signal by control level 3 and control level 4.C21、
C22, C23 are capacitance, are used for excluding DC voltage.
This receiver radio frequency front-end processing circuit also includes the low-pass filtering module being connected in series and AD sampling module, described
The outfan of low-pass filtering module is connected with the outfan of amplification module.The low-pass filtering module of the present invention is to amplified process
Signal is filtered, and sends into AD sampling after filtering interference signals.Directly AD sampling can be carried out to signal after being low-pass filtered,
This is different from the scheme comprising frequency-variable module, also eliminates the need for the interference of image frequency due to not comprising frequency-variable module, does not also deposit
The problems such as local oscillator leakage, DC shift, and structure simply eliminates the design debugging of local oscillator module, before enormously simplify radio frequency
The structure at end.
A kind of receiver of the present invention, including the electricity of the receiver radio frequency front-end processing based on directly sampling as shown in Figure 2
Road.The other structures of receiver are all identical with existing receiver structure, will be not repeated herein.
Receiver also includes DDS self-inspection generation module, and described DDS self-inspection generation module is used for producing self-test signal and inputting
To channel selecting module.
The receiver radio frequency front-end processing scheme that the 9kHz～32MHz of the present invention directly samples, radiofrequency signal is through passage
Selection, attenuation module, pre-selection filtering group, amplification module, after low-pass filtering, it is directly entered AD sampling A/D chip and is digitized locating
Reason, and then realize the functions such as intermediate frequency panorama, radio frequency panorama, video panorama and the demodulation analysis of this receiver.
The control circuit of the present invention can realize the offer of control voltage by FPGA.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not model is protected to the present invention
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not
Need to pay the various modifications that creative work can make or deformation still within protection scope of the present invention.
Claims (10)
1. a kind of controllable attenuation circuit is it is characterised in that include decay branch road and the direct current branch being connected in parallel；Described decay
Road is connected with control circuit respectively with direct current branch, and control circuit is used for controlling in decay branch road and this two branch roads of direct current branch
Article one, branch road conducting, another branch road disconnects.
2. as claimed in claim 1 a kind of controllable attenuation circuit it is characterised in that described control circuit output first controls electricity
Gentle second control level；Described decay branch road includes damping resistance, the two ends of described damping resistance respectively with the first diode
It is connected with the anode of the second diode；Described direct current branch includes the first electric capacity, and the two ends of described first electric capacity are respectively with the 3rd
The anode of diode and the 4th diode is connected；The equal first control level phase of negative electrode of described first diode and the second diode
Even；Equal second control level of negative electrode of described 3rd diode and the 4th diode is connected.
3. a kind of amplification control circuit is it is characterised in that include amplification branch road and the direct current branch being connected in parallel；Described amplification props up
Road is connected with control circuit respectively with direct current branch, and control circuit is used for controlling and amplifies in branch road and this two branch roads of direct current branch
Article one, branch road conducting, another branch road disconnects.
4. as claimed in claim 3 a kind of amplification control circuit it is characterised in that described control circuit output the 3rd control electricity
Gentle 4th control level；Described amplification branch road includes amplifier, the two ends of described amplifier respectively with the 5th diode and the
The anode of six diodes is connected；Described direct current branch includes the second electric capacity, the two ends of described first electric capacity respectively with the seven or two pole
Pipe is connected with the anode of the 8th diode；Equal 3rd control level of negative electrode of described 5th diode and the 6th diode is connected；
Equal 4th control level of negative electrode of described 7th diode and the 8th diode is connected.
5. a kind of receiver radio frequency front-end processing circuit based on directly sampling is it is characterised in that include control circuit, described control
Circuit processed is connected with channel selecting module, attenuation module, pre-selection filtering group module and amplification module respectively；
Channel selecting module, it receives radiofrequency signal and self-test signal, and the control level effect producing in described control circuit
Under, select radiofrequency signal or self-test signal output；
Attenuation module, described attenuation module is made up of the arbitrary described controllable attenuation circuit of such as claim 1-2, and it is used in institute
State under the control level effect of control circuit generation, quantitative decay is carried out to the signal of channel selecting module output；
Described pre-selection filtering group module comprises the switch filter group of a box formation passage, for receiving described control circuit
The filtering channel to select corresponding band for the control level producing, thus realize the pre-selection filtering to the signal after quantitative decay；
Amplification module, it is used under the control level effect that described control circuit produces, and it is fixed that the signal that pre-selection is filtered is carried out
Amount is amplified and is exported.
6. as claimed in claim 5 a kind of receiver radio frequency front-end processing circuit based on directly sampling it is characterised in that institute
State the amplification control circuit that amplification module comprises one-level amplification control circuit or at least two-stage series connection connects；Described amplification controls electricity
Road includes the amplification branch road being connected in parallel and direct current branch；Described amplification branch road is connected with control circuit respectively with direct current branch,
Control circuit is used for controlling amplifies a branch road conducting in branch road and this two branch roads of direct current branch, and another branch road disconnects.
7. as claimed in claim 6 a kind of amplification control circuit it is characterised in that described control circuit output the 3rd control electricity
Gentle 4th control level；Described amplification branch road includes amplifier, the two ends of described amplifier respectively with the 5th diode and the
The anode of six diodes is connected；Described direct current branch includes the second electric capacity, the two ends of described first electric capacity respectively with the seven or two pole
Pipe is connected with the anode of the 8th diode；Equal 3rd control level of negative electrode of described 5th diode and the 6th diode is connected；
Equal 4th control level of negative electrode of described 7th diode and the 8th diode is connected.
8. as claimed in claim 1 a kind of based on directly sampling receiver radio frequency front-end processing circuit it is characterised in that should
Receiver radio frequency front-end processing circuit also includes the low-pass filtering module being connected in series and AD sampling module, described low-pass filtering mould
The outfan of block is connected with the outfan of amplification module.
9. a kind of receiver is it is characterised in that include described penetrating based on the receiver of direct sampling as arbitrary in claim 1-8
Frequency front-end processing circuit.
10. as claimed in claim 9 a kind of receiver it is characterised in that also including DDS self-inspection generation module, described DDS from
Inspection generation module is used for producing self-test signal and inputting to channel selecting module.
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| CN201611024783.2A CN106411343B (en) | 2016-11-15 | 2016-11-15 | It is a kind of based on the receiver radio frequency front-end processing circuit directly sampled and receiver |
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| CN201611024783.2A CN106411343B (en) | 2016-11-15 | 2016-11-15 | It is a kind of based on the receiver radio frequency front-end processing circuit directly sampled and receiver |
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| CN106411343B CN106411343B (en) | 2019-04-02 |
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