CN108599783A - A kind of frequency distribution module that frequency is configurable - Google Patents
A kind of frequency distribution module that frequency is configurable Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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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
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The present invention discloses a kind of frequency distribution module that frequency is configurable comprising：Microprocessor circuit, radio frequency signal processing circuit and power circuit, microprocessor circuit receives the frequency distribution instruction that host computer issues, and frequency distribution instruction is sent to radio frequency signal processing circuit, RF switch is controlled simultaneously connects corresponding filter, the external radio frequency main signal of input is distributed into the same radio no more than the roads N by radio frequency signal processing circuit according to the frequency distribution instruction received by power distributing circuit, is exported after filtered circuit filtering.Further, the time-frequency equipment configured with the frequency distribution module is also disclosed.The present invention can solve the distribution of the radiofrequency signal of multi-frequency by frequency distribution module, the distribution output of multi-frequency is realized according to the demand configuration module working condition of user, to substantially reduce design, the production work amount of module, the ease of use and maintainability of user are improved.
Description
Technical field
The present invention relates to private radio communication industries, are a kind of frequency distribution modules for time-frequency equipment.
Background technology
It refers to the single-frequency value sine-wave oscillation signal that can provide high accuracy to mark frequency signal, and frequency values are mainly
1MHz, 5MHz, 10MHz or 100MHz.Frequency signal is marked mainly to be generated by quartz oscillator or high accuracy atomic frequency standard, it is brilliant
The advantages that oscillation body device is small, at low cost, easy to use, frequency short-term stability is good due to its, has been widely used, almost
All electronic products can all be used, and be main frequency signal generating source, but it is there is also frequency long-term stability is poor, frequency drift
Move the shortcomings of larger.Therefore, high-precision scale frequency signal usually selects atomic frequency standard, current atom frequency marking mainly to have Cs atom frequency
Mark, Rb atom frequency marking and Hydrogen Atom Frequency Standard, wherein Rb atom frequency marking is with small, price is relatively low, preheating is fast, index
The advantages that excellent, low in energy consumption, can realize accuracy 1 × 10 by more application-11, stability 1 × 10-12The height of magnitude refers to
Mark performance.
Mark frequency source generally only exports standard-frequency signal all the way, time-frequency equipment need to carry out it frequency conversion, extension, distribution,
It is filtered, the mark frequency signal of output multi-channel multi-frequency, provides the user with the mark frequency signal reference of Low phase noise, high stable, be
The important component of the systems such as communication, navigation.Mark one of the module that frequency distribution module is important in time-frequency equipment, the prior art
In, mark frequency distribution module is typically only capable to be allocated a certain fixed frequency, when needing to be allocated for multi-frequency value, needs
The mark frequency distribution module of different frequency can be distributed by being respectively configured.
Invention content
In view of the above-mentioned problems, the present invention provides a kind of frequency distribution module for time-frequency equipment and with this frequency point
Time-frequency equipment with module, main purpose are to meet different user to export different frequency and different numbers to time-frequency equipment mark frequency signal
The demand of amount, the module can solve the distribution of the radiofrequency signal of multi-frequency simultaneously, to substantially reduce the designing of module, give birth to
Workload is produced, the ease of use and maintainability of user are improved.
The technical scheme is that：
A kind of frequency distribution module that frequency is configurable, including：Microprocessor circuit is configured with and is communicated to connect with host computer
Microprocessor；Radio frequency signal processing circuit is configured with the filter circuit of power distributing circuit and the parallel connection of the roads N, every to filter all the way
Circuit configuration has a filtering switch unit, the filtering switch unit to have RF switch and M filter in parallel, the filter
Wave device is low-pass filter or bandpass filter, and the cutoff frequency of each low-pass filter or the centre frequency of bandpass filter are big
Small difference switches over different filters by the RF switch connected from microprocessor, and M and N are the integer more than 1；
Power circuit provides power supply supply for radio frequency signal processing circuit and microprocessor circuit；On the microprocessor circuit receives
The frequency distribution instruction that position machine issues, and frequency distribution instruction is sent to radio frequency signal processing circuit, while according to frequency point
Corresponding filter is connected with instruction control RF switch；The radio frequency signal processing circuit refers to according to the frequency distribution received
It enables, the external radio frequency main signal of input is distributed by the same radio no more than the roads N by power distributing circuit, then by filtering
It is exported after wave circuit filtering.
As a preferred embodiment, the radio frequency signal processing circuit further includes positioned at the of power distributing circuit input terminal
One signal coupling circuit and the first RF power sensing circuit connected to it, and positioned at the second of each filter circuit output end
Signal coupling circuit and the second RF power sensing circuit connected to it；First signal coupling circuit and second signal coupling electricity
Road respectively samples input and output signal, the first RF power sensing circuit and the second RF power sensing circuit difference
The RF power strength of sampled signal is converted into the sampled voltage signal of size in proportion, and sends it to microprocessor electricity
Road；The microprocessor circuit receives the sampled voltage signal of radio frequency signal processing circuit output, and it is preset with corresponding
Value is compared, and to judge the signal condition of input, output signal, and is reported supreme position machine.
As a preferred embodiment, the microprocessor circuit receives the sampled voltage letter of radio frequency signal processing circuit output
Number, and it is compared with preset value, to judge the signal condition of input, output signal, specifically include：
The sampled voltage signal of input signal is compared with preset first reference voltage and the second reference voltage：
When sampled voltage is more than the first reference voltage, judgement has input signal and amplitude is normal；
When sampled voltage is between the first reference voltage and the second reference voltage, judgement has input signal, but amplitude
It is less than normal abnormal；
When sampled voltage is less than the second reference voltage, no input signal is judged；
The sampled voltage signal of output signal is compared with preset third reference voltage and the 4th reference voltage：
When sampled voltage is more than third reference voltage, judgement has input signal and amplitude is normal；
When sampled voltage is between third reference voltage and the 4th reference voltage, judgement has input signal, but amplitude
It is less than normal abnormal；
When sampled voltage is less than four reference voltages, no input signal is judged.
As a preferred embodiment, microprocessor circuit also receives the enabled instruction of frequency distribution that host computer issues, and root
The work that power distributing circuit in enabled instruction control radio frequency signal processing circuit is distributed according to frequency is enabled, to activate or close point
With output.
As a preferred embodiment, radio frequency signal processing circuit further includes the roads the N put-through channel in parallel with filter circuit, is led to
Cross switching of the RF switch realization to filter circuit and put-through channel, the working condition for detecting road filter circuit.
As a preferred embodiment, RF switch selects single pole multiple throw, to realize to different in filtering switch unit
The switching of filter；Filter uses Elliptic Function Type LC low passes or bandpass filter structures.
As a preferred embodiment, each road filter circuit is each equipped with isolated amplifier and/or the power distribution
Circuit input end is configured with low noise amplifier circuit.
As a preferred embodiment, low noise amplifier circuit selects low noise operational amplifier；Isolated amplifier, which is selected, to be driven
Dynamic amplifier, makes radiofrequency signal be mutually isolated, will not mutual cross talk effects.
As a preferred embodiment, the power circuit includes DC/DC switch bucks filter circuit and LDO linear voltage stabilization electricity
Road, DC/DC switch buck filter circuits are used to high voltage input being converted into low-voltage output；LDO linear voltage-stabilizing circuits include
First LDO linear voltage-stabilizing circuits and the 2nd LDO linear voltage-stabilizing circuits, the first LDO linear voltage-stabilizing circuits, which are used to switch DC/DC, to drop
The low pressure of press filtration wave circuit output works to radio frequency signal processing circuit after being handled and uses；2nd LDO linear voltage-stabilizing circuits
Low pressure for exporting DC/DC switch buck filter circuits works to microprocessor circuit after being handled and uses, to reach
Not only the noise of radio circuit power supply and digital circuit power source had been reduced, but also has improved mutually isolated effect.Preferably, power circuit packet
DC/DC switch bucks filter circuit and LDO linear voltage-stabilizing circuits are included, DC/DC switch buck filter circuits input 24V outputs+6V
High voltage input is converted into low-voltage output by voltage；LDO linear voltage-stabilizing circuits include the first LDO linear voltage-stabilizing circuits and the
Two LDO linear voltage-stabilizing circuits, the first LDO linear voltage-stabilizing circuit input+6V output+5V voltages give radio frequency signal processing circuit work
It uses；2nd LDO linear voltage-stabilizing circuit input+6V output+3.3V voltages work to microprocessor circuit and use.
As a preferred embodiment, power circuit further includes operating current detection circuit, and current working current is converted
At voltage signal, and export to microprocessor circuit；Microprocessor circuit carries out the operating voltage signal that power circuit exports
Detection, by being compared with preset value, to judge the working condition of power circuit, and is reported supreme position machine.
As a preferred embodiment, microprocessor circuit examines the operating voltage signal that current working current is converted into
It surveys, by being compared with preset value, to judge the working condition of active circuit, specifically includes：
The microprocessor is by operating voltage signal compared with preset 5th reference voltage and the 6th reference voltage：
When operating voltage is more than five reference voltages, judgment module electric current is bigger than normal, operation irregularity；
When operating voltage is between the 5th reference voltage and the 6th reference voltage, judge that operating current is normal；
When operating voltage is less than six reference voltages, judgment module electric current is less than normal, operation irregularity.
Further, invention additionally discloses a kind of time-frequency equipment, can configure configured with frequency as characterized above
Frequency distribution module.
Advantageous effect：
(1) by the low pass or bandpass filter of multiple parallel connections in radio frequency signal processing circuit, different frequency signals are realized
Filtering output, can be adapted for the demand of different frequency distribution, reduce module type, improve versatility and backup quantity,
Be conducive to product later maintenance.
(2) way of filter circuit, type, quantity and the cutoff frequency of filter can be set according to demand, and increase can divide
With frequency type, the adaptability and functionality of frequency distribution module are improved, reduces equipment research and development, production, maintenance cost.
(3) by the RF power sensing circuit of radio frequency signal processing circuit input/output terminal, frequency distribution module is realized
Fault self-checking；Pass through through path, moreover it is possible to detect the working condition of each filter in filter circuit, fast and easy positioning event
Barrier reduces user's troubleshooting difficulty.
(4) it selects single pole multiple throw to realize to the switching of different filters and through path in filter circuit, brings
Insertion loss to marking frequency effect of signals very little, and influence of the switch isolation degree to filter is also very small, fully meets use
It is required that.
(5) it is based on frequency distribution module proposed by the present invention, time-frequency equipment can be allowed to have rate-adaptive pacemaker configurability,
It is not limited to mark frequency division to match, to expand the scope of application of frequency distribution, to meet multi-user's different demands.
Description of the drawings
Fig. 1 is frequency distribution module composition frame chart in embodiment；
Fig. 2 is frequency distribution module appearance schematic diagram in embodiment；
Fig. 3 is microprocessor peripheral interface block diagram in embodiment；
Fig. 4 is that radiofrequency signal handles block diagram in embodiment；
Fig. 5 is low-pass filter structure schematic diagram in embodiment；
Fig. 6 is that 1MHz low-pass filters emulate frequency response figure in embodiment；
Fig. 7 is that 5MHz low-pass filters emulate frequency response figure in embodiment；
Fig. 8 is that 10MHz low-pass filters emulate frequency response figure in embodiment；
Fig. 9 is RF switch insertion loss frequency response figure in embodiment；
Figure 10 is RF switch isolation frequency response figure in embodiment.
Specific implementation mode
The configurable frequency distribution module of frequency disclosed in frequency distribution module of the present invention can be used 3U (100mm ×
160mm) calibrated altitude, 4HP (1HP=5.08mm) width structure form are selected firm resistance to the interconnection of apparatus back board low frequency signal
With 110 core ribbon bits of coded CPCI standard connectors of type, radiofrequency signal interconnection selects SBMA can floating blind plugging formula radio frequency connector.
The mark rate distribution module mainly by power voltage step down, filtering, current detection circuit, amplification, divide by radio-frequency signal detection
Match, be filtered circuit, microprocessor detection, communication, control, management circuit composition.External input is pre-set any one
After the radiofrequency signal of kind frequency, it can distribute three tunnels of output identical radiofrequency signal by radio frequency part circuit, signal distribution
Working frequency can carry out software configuration switching, input radio frequency signal (i.e. input signal) and output by microprocessor to radio circuit
Radiofrequency signal (i.e. output signal) respectively by power detection after, give microprocessor carry out A/D samplings, with judge signal whether there is or not with
It is whether normal.Module is communicated and is managed with equipment by bus communication interface, and present operating frequency, reporting module work are configured
Make state and input and output radio frequency interface signal condition.Power voltage step down, filter circuit are defeated by externally input 24V power voltage step downs
Go out high quality, low ripple+3.3V and+5V voltages, is used for chip in module and active circuit, current detection circuit passes through real-time
Current working current is detected, after microprocessor A/D samplings, whether judgment module active circuit working condition is abnormal.Work as appearance
When abnormal, reported in time to equipment by bus communication interface.
In view of current time-frequency equipment mostly is mainly used for exporting tri- kinds of frequency sine wave mark frequency letters of 1MHz, 5MHz, 10MHz
Number, below for a kind of these three mark specific embodiments of frequency distribution module of frequency Design of Signal.
As shown in Figure 1, disclosing a kind of frequency point for exporting tri- kinds of mark frequency signals of 1MHz, 5MHz, 10MHz in embodiment
With module (the referred to as module), which is mainly made of circuits such as power unit, microprocessor and radio frequency processings.In figure：
1 is input mark frequency signal power detection circuit, and the RF power strength of the mark frequency signal of input is converted into together
The voltage signal of scale, to facilitate microprocessor samples, the voltage value V after samplinginWith two reference voltage Vsref1With
Vref2Compare, reference voltage Vref1And Vref2It determines, and is recorded in the module software after being surveyed according to modular debugging.Signal has
Nothing and whether normally judge in accordance with the following methods：
Work as Vin≥Vref1When, input signal has, and amplitude is normal；
Work as Vref1＞ Vin＞ Vref2When, input signal has, but amplitude is less than normal abnormal；
Work as Vin＜ Vref2When, input signal without.
2 be the amplification of input mark frequency signal, distribution, filter circuit, and the processing of mark frequency signal is mainly completed by the circuit, believed
Number processing index performance mainly thus determine, be the Key Circuit part of the module.
3 be output mark frequency signal power detection circuit, is detected respectively to three road sign frequency signals of output, after sampling
The V of voltage valueOUTWith two reference voltage Vsref3And Vref4Compare, reference voltage Vref3And Vref4According to true after modular debugging actual measurement
It is fixed, and be recorded in module software.Signal whether there is or not with whether normally judge in accordance with the following methods：
Work as VOUT≥Vref3When, output signal has, and amplitude is normal；
Work as Vref3＞ VOUT＞ Vref4When, output signal has, but amplitude is less than normal abnormal；
Work as VOUT＜ Vref4When, output signal without.
4 be microprocessor circuit, and microprocessor is the sampling of the module, judgement, decision, control section, mainly passes through it
The software realization of storage, while the module is communicated by microprocessor with equipment (host computer), the management of accepting device and
Configuration, the current working status of the real-time report module.
5 be power voltage step down, filtering, operating current detection circuit, wherein power voltage step down, filter circuit by it is externally input+
24V power supplys are converted, reduced output voltage+3.3V ,+5V voltages by DC/DC and LDO voltages, and the output of the roads Bing Duimei carries out power filter
Processing ensures the quality of out-put supply, reduces crosstalk of the power supply ripple between the interference and power supply of radio circuit.Operating current
Current working current is converted into voltage signal by detection circuit, the voltage value V after microprocessor samplesIDETWith two reference voltages
Vref5And Vref6Compare, reference voltage Vref5And Vref6It determines, and is recorded in module software after being surveyed according to modular debugging.It should
Whether module operating current normally judges in accordance with the following methods：
Work as VIDET≥Vref5When, operating current is bigger than normal, the module operation irregularity；
Work as Vref5＞ VIDET＞ Vref6When, operating current is normal；
Work as VIDET＜ Vref4When, operating current is less than normal, the module operation irregularity.
As shown in Fig. 2, the frequency distribution module appearance schematic diagram described in embodiment show the module board shape and
External interconnecting interface form, in figure：
6 be module printed board, meets the structure size requirement of 3U, and plate thickness 1.6mm is designed, such as using four-sheet structure
Printed board stack-design includes L1 signals layers, L2 bus planes, the stratum L3, L4 signals layers.Radiofrequency signal mainly passes through L4 signals layers
Cabling, characteristic impedance reference layer are the stratum L3, and the impedance matching property of frequency signal is marked by control, can effectively ensure that radio frequency
Index performance.The overall thickness of module printed board 6 is about 63.46mil, i.e. 1.61mm.
7 be the curved formula socket of SBMA types, set in embodiment there are four, input and output mark frequency signal passes through the connector and equipment
Backboard interconnects, and can effectively ensure that the indexs performances such as characteristic impedance, insertion loss, the isolation of mark frequency signal, while the connection
Feature that utensil had float can offset micro-structure error when installation, extend the service life of connector, improve equipment work
The reliability of work.
8 be band bits of coded CPCI standard connectors, which is 110 core of Durable solar 2.0mm spacing, is had anti-
Error location pin can meet the requirement of module blindmate.
9 be module printed board and structural member mounting hole, for being connected and fixed for module printed board 6 and modular structure part,
In, modular structure part can be that radio frequency part circuit plays shielding action, reduce internal circuit crosstalk and external disturbance, while circuit
The heat that part generates can be radiated by modular structure part and be passed to device structure part, for module reliably, steady operation provides
It ensures.
In embodiment, microprocessor circuit selects 32 arm processor chips with stronger versatility
STM32F103RCT6, the microprocessor are based on 32 Cortex-M3 kernels of ARM, have highest 72MHz working frequencies, 512K
Byte FLASH program memory, possess USB, CAN, 11 timers, 3 12 ADC converters, up to 13 communication interfaces and
The resources such as multiple quick multifunctionals are I/O mouthfuls two-way, fully meet the demands such as control, the communication of the module, and with it is prodigious can
Extending space.
As shown in figure 3, microprocessor peripheral interface block diagram shows the main peripheral circuit of microprocessor and uses interior
Portion's resource.In figure：
10 be microprocessor externally fed power voltage step down circuit, and+3.3V working powers are provided for microprocessor.
11 be module operating current detection circuit, and transformed voltage signal has to microprocessor samples with judgment module
Source circuit operating current situation.
12 be CAN bus transponder chip circuit, and the CAN controller input/output signal of microprocessor internal passes through
Level conversion and impedance matching are connected on CAN physical bus, and can be connect with host computer by CAN bus.
13 be no source crystal, and after being connect with microprocessor and the oscillating circuit of chip interior forms crystal-oscillator circuit,
The master clock that oscillation output microprocessor work uses, microprocessor internal can be based on the clock frequency, carry out frequency multiplication or frequency dividing
To change real work clock frequency.
14 be the in-circuit emulation debugging interface of microprocessor, is used for software code on-line debugging and programming.
15 be microprocessor debugging serial ports, can also input instruction with print software work state information, inquire current work
Make state and data.
16 be FLASH memory, a kind of Nonvolatile memory, in the absence of a power supply, preservation mould that can be permanent
The supplemental characteristics such as block working frequency facilitate working condition before capable of being restored to after power-off restarting.
17 be that input mark frequency signal power detection signal judges input mark frequency signal shape after microprocessor A/D samplings
State.
18 be that output mark frequency signal power detection signal judges output mark frequency signal shape after microprocessor A/D samplings
State.
19 be radio circuit working frequency switching signal, the working frequency that module is arranged by bus communication interface receiving device
Information switches radio circuit frequency to match corresponding setting by the interface.
Through the above scheme, microprocessor circuit receives the mark frequency division that host computer issues and matches with instruction, and according to mark frequency division
Radio frequency signal processing circuit is switched to corresponding working frequency by instruction, this is also so-called external control model.Microprocessor
Circuit can carry out power detection to input and output mark frequency signal, signal strength be judged whether in normal range (NR), to judge to believe
Number whether there is or not, will determine that result timing reported to host computer；Microprocessor circuit can also in real time detection module operating voltage and disappear
Power consumption stream, wherein operating voltage includes the 24V voltages inputted in power circuit, 3.5V the and 5V voltages of output, consumes electric current master
The total current to be referred to, and judge whether in normal range (NR), it is reported to host computer when occurring abnormal.Further, microprocessor
Device circuit can be configured with enabled command signal input terminal, the enabled instruction issued for receiving host computer, and according to enabled
Whether instruction control mark frequency exports, which is mainly used in debugging or inputs the unstable situation of frequency.
Radio frequency signal processing circuit is to mark the groundwork circuit of frequency signal distribution, completes the inspection of input radio frequency signal
It surveys, amplification, distribute, then by the filter group of different operating frequency, the mark frequency signal of different output frequencies is carried out different
Filtering, reaches best harmonic suppression effect.Multiple filters are switched over by RF switch, and switch-over control signal is by micro-
Device output is managed, the mark frequency signal of output shows its working condition by power detection per road.Radio frequency signal processing circuit its can connect
It is controlled by for microprocessor, distributing chip operation by control enables, activation or closing distribution output；It can also be in Wei Chu
Under the control for managing device, by the switching one by one to filter, the frequency identification to input mark frequency signal is realized.
As shown in Figure 4, it is shown that the process flow of radiofrequency signal, in figure：
20 be external mark frequency input signal, can be any one in 1MHz, 5MHz, 10MHz frequency.
21 be that mark frequency signal coupling circuit separates the signal of sub-fraction power from radio frequency main signal, not by coupling
Under the premise of the normal transmission and performance that influence main signal, the power feelings of main signal are indicated in real time with certain power proportions
Condition plays the role of monitoring main signal in real time.
22 be RF power sensing circuit, and the main active wave detector chip for using ADI companies passes through the signal of input
After quadratic detection, is amplified with the amplifier that square law circuit is feedback, had with input signal using output after Hyblid Buffer Amplifier
The corresponding voltage of valid value, all has different input signals that good output is linear and stability.
23 be the power detection voltage for marking frequency input signal, in the microprocessor, by the voltage and two reference voltages
Vref1And Vref2Compare, to judge input signal, normally whether there is or not with.
24 be low noise amplifier circuit, selects low noise operational amplifier, provides certain power gain, to input
Mark frequency signal be amplified, meet the wider power bracket of input signal, and itself generates lower noise, will not be larger
Deteriorate the noise objective of mark frequency signal.
25 be power distributing circuit, the mark frequency signal that will be inputted all the way, the identical mark frequency signal in three tunnels of distribution output.
26 be isolated amplifier, selects driving amplifier, and output mark frequency signal in three tunnels is allowed to be mutually isolated, will not mutual crosstalk
It influences.
27 be RF switch, which selects hilted broadsword four-throw (SP4T) to switch, and provides four switching channels, three channels point
Not Yong Yu different frequency low-pass filter, the 4th channel is put-through channel, can be used for channel self-test, to judge filter
Whether failure.The different switching channel RF switches from the insertion loss frequency response of RF switch under different temperatures in Fig. 9 and Figure 10
Isolation frequency response (wherein, RF1~RF4 corresponds to 1MHz, 5MHz, 10MHz, leads directly to respectively) should be apparent that the radio frequency of selection
Switch insertion loss is to marking frequency effect of signals very little, and each switch isolation degree is more than 45dB, and two switch isolation degree are more than
90dB does not interfere with the stopband rejection of filter, fully meets requirement.
28 be 1MHz low-pass filters, which uses elliptic function structure, have preferable squareness factor and
Preferably intermediate zone rejection.Fig. 5 is the structural schematic diagram of the low-pass filter, the structure is based on, by being obtained after emulation
Inductance in table 1 and capacitance component value.Fig. 6 is that 1MHz low-pass filters emulate frequency response figure, as seen from the figure the low-pass filter
With lower insertion loss, while stopband inhibits higher, and 1MHz marks the primary, secondary of frequency signal, triple-frequency harmonics can reach
Therefore the inhibition of 80dB or more can guarantee harmonics restraint 85dB or more substantially after the amplified mark frequency signal of isolation is filtered
High performance index.
Table 1
29 be 5MHz low-pass filters, which uses elliptic function structure, structural schematic diagram same Fig. 5, Fig. 7
Frequency response figure is emulated for 5MHz low-pass filters, table 2 is 5MHz low-pass filter component values.The stopband of the low-pass filter inhibits
Ability is stronger, can equally ensure that the mark frequency signal harmonic exported after filtering inhibits the high performance index of 85dB or more.
Table 2
30 be 10MHz low-pass filters, which uses elliptic function structure, the same Fig. 5 of structural schematic diagram, figure
8 emulate frequency response figure for 10MHz low-pass filters, and table 2 is 10MHz low-pass filter component values.The stopband of the low-pass filter
Rejection ability is stronger, can equally ensure that the mark frequency signal harmonic exported after filtering inhibits the high performance index of 85dB or more.
Table 3
31 be the power detection voltage for marking frequency output signal, by the voltage and two reference voltage Vsref3And Vref4Compare, with
Judging output signal, normally whether there is or not with.32 be mark frequency output signal, and three road signal outputs are shared in embodiment.
Power supply processing circuit provides stable, low noise power supply and supplies for radio frequency signal processing circuit and microprocessor circuit
It gives, decompression processing is carried out to externally input power supply, provide power supply supply for module active chip and circuit, be the base of module
This guarantee circuit.The design of the circuit is electric using the LDO linear voltage stabilizations of efficient DC/DC decompression filter circuits and low noise
Road, while ensureing transfer efficiency, moreover it is possible to improve the quality of out-put supply, and realize the miniaturization of circuit.Power supply output+
3.3V voltages mainly work to digital circuits such as microprocessors and use, and+5V the voltages of power supply output mainly give radio frequency part circuit
Work uses, and makes have higher isolation between the two-way voltage of output by LDO linear voltage stabilization filter circuits, is avoided that digital electricity
Power supply crosstalk between road and radio circuit ensures radiofrequency signal index performance.
Below to the frequency distribution module for exporting tri- kinds of mark frequency signals of 1MHz, 5MHz, 10MHz described in embodiment
Main operational principle is briefly described：
Power distribution：Pass through above-described microprocessor circuit, radio frequency signal processing circuit main power source processing circuit three
The co-ordination of kind circuit can complete the frequency distribution of three kinds of mark frequency signals.For example, when mark frequency input 1MHz signals, if
It is standby to be operated in 1MHz states by the way that frequency distribution module is arranged, specifically, microprocessor through bus communication interface receives
After 1MHz marks the distribution instruction of frequency signal, corresponding handover configurations are made to radio circuit filter group switch, meet wanting for working frequency
It asks, the mark frequency signal after the distribution of three tunnels of output, while the setting will be stored into the FLASH memory being connect with microprocessor,
It is just changed again after lower secondary device reconfigures, otherwise always works at the frequency, power-off restarting successor is so effective.
Input-output power detects：The module can carry out work(to the mark frequency signal of input and the mark frequency signal of all outputs
Rate sample detecting, real-time indicateing arm frequency interface signal state.It, can also be by detecting simultaneously when module operating current occurs abnormal
It was found that timely reporting equipment.
Channel self-test：When radio frequency signal processing circuit occurs abnormal, can also be detected by RF switch put-through channel is
No is filter failure.
In conclusion being based on frequency distribution module disclosed in this invention, the distribution of multi-frequency can be achieved at the same time, and not
It is limited to mark frequency division to match, improves the versatility of module, expand the application scenarios of module.Also, it, can be very by these detections
Good display module current working status grasps the unusual condition occurred immediately, has higher from sensing capability.
Although embodiment of the present invention is described above in association with attached drawing, the invention is not limited in above-mentioned
Specific embodiments and applications field, above-mentioned specific embodiment are only schematical, directiveness, rather than restricted
's.Those skilled in the art under the enlightenment of this specification, in the range for not departing from the claims in the present invention and being protected
In the case of, a variety of forms can also be made, these belong to the row of protection of the invention.
Claims (10)
1. a kind of configurable frequency distribution module of frequency, which is characterized in that including：
Microprocessor circuit, configured with the microprocessor communicated to connect with host computer；
Radio frequency signal processing circuit is configured with the filter circuit of power distributing circuit and the parallel connection of the roads N, is configured per filter circuit all the way
There is a filtering switch unit, it is low that the filtering switch unit, which has RF switch and M filter in parallel, the filter,
Bandpass filter or bandpass filter, and the cutoff frequency of each low-pass filter or the centre frequency of bandpass filter are of different sizes,
Different filters are switched over by the RF switch connected from microprocessor, M and N are the integer more than 1；
Power circuit provides power supply supply for radio frequency signal processing circuit and microprocessor circuit；
The microprocessor circuit receives the frequency distribution instruction that host computer issues, and frequency distribution instruction is sent to radiofrequency signal
Processing circuit, and distribute instruction control RF switch according to frequency and connect corresponding filter；The radio frequency signal processing circuit
Instruction is distributed according to the frequency received, the external radio frequency main signal of input is distributed into no more than N by power distributing circuit
The same radio on road, then exported after being filtered by filter circuit.
2. frequency distribution module as described in claim 1, which is characterized in that
The radio frequency signal processing circuit further include positioned at power distributing circuit input terminal the first signal coupling circuit and and its
First RF power sensing circuit of connection, and connect positioned at the second signal termination power of each filter circuit output end and with it
The second RF power sensing circuit connect；First signal coupling circuit and second signal termination power are respectively to outputting and inputting letter
It number is sampled, the first RF power sensing circuit and the second RF power sensing circuit are respectively by the radio-frequency power of sampled signal
Intensity-conversion and sends it to microprocessor circuit at the sampled voltage signal of size in proportion；
The microprocessor circuit receives the sampled voltage signal of radio frequency signal processing circuit output, and it is preset with corresponding
Value is compared, and to judge the signal condition of input, output signal, and is reported supreme position machine.
3. frequency distribution module as claimed in claim 2, which is characterized in that the microprocessor circuit receives at radiofrequency signal
The sampled voltage signal of circuit output is managed, and it is compared with preset value, with detection input, the signal shape of output signal
State specifically includes：
The sampled voltage signal of input signal is compared with preset first reference voltage and the second reference voltage：
When sampled voltage is more than the first reference voltage, judgement has input signal and amplitude is normal；
When sampled voltage is between the first reference voltage and the second reference voltage, judgement has input signal, but amplitude is less than normal
It is abnormal；
When sampled voltage is less than the second reference voltage, no input signal is judged；
The sampled voltage signal of output signal is compared with preset third reference voltage and the 4th reference voltage：
When sampled voltage is more than third reference voltage, judgement has input signal and amplitude is normal；
When sampled voltage is between third reference voltage and the 4th reference voltage, judgement has input signal, but amplitude is less than normal
It is abnormal；
When sampled voltage is less than four reference voltages, no input signal is judged.
4. frequency distribution module as described in claim 1, which is characterized in that the microprocessor circuit also receives under host computer
The enabled instruction of frequency distribution of hair, and it is enabled according to the work of the enabled instruction control power distributing circuit of frequency distribution, to activate
Or close distribution output.
5. frequency distribution module as described in claim 1, which is characterized in that the radio frequency signal processing circuit further includes the roads N
The put-through channel in parallel with each filter circuit respectively is realized the switching to filter circuit and put-through channel by RF switch, is used
In the working condition of detection filter circuit.
6. frequency distribution module as described in claim 1, which is characterized in that each road filter circuit is each equipped with isolation and puts
Big device and/or the power distributing circuit input terminal are configured with low noise amplifier circuit.
7. frequency distribution module as described in claim 1, which is characterized in that the power circuit includes DC/DC switch bucks
Filter circuit and LDO linear voltage-stabilizing circuits, DC/DC switch buck filter circuits are used to high voltage input being converted into low-voltage defeated
Go out；LDO linear voltage-stabilizing circuits include the first LDO linear voltage-stabilizing circuits and the 2nd LDO linear voltage-stabilizing circuits, and the first LDO is linearly steady
Volt circuit after being handled the low pressure that DC/DC switch buck filter circuits export to radio frequency signal processing circuit work for making
With；2nd LDO linear voltage-stabilizing circuits are for giving microprocessor after being handled the low pressure that DC/DC switch buck filter circuits export
The work of device circuit uses, and to reach the noise for not only reducing radio circuit power supply and digital circuit power source, but also improves mutually isolated
Effect.
8. frequency distribution module as claimed in claim 7, which is characterized in that
The power circuit further includes operating current detection circuit, and current working current is converted into operating voltage signal, and
It exports to microprocessor circuit；
The microprocessor circuit is detected the operating voltage signal that power circuit exports, by being compared with preset value
Compared with to judge the working condition of power circuit, and being reported supreme position machine.
9. frequency distribution module as claimed in claim 8, which is characterized in that the microprocessor circuit is to current working current
The operating voltage signal being converted into is detected, by being compared with preset value, to judge the working condition of active circuit, and tool
Body includes：
The microprocessor is by voltage signal compared with preset 5th reference voltage and the 6th reference voltage：When operating voltage is big
When five reference voltages, judgment module electric current is bigger than normal, operation irregularity；
When operating voltage is between the 5th reference voltage and the 6th reference voltage, judge that operating current is normal；
When operating voltage is less than six reference voltages, judgment module electric current is less than normal, operation irregularity.
10. a kind of time-frequency equipment, which is characterized in that configuration can configure just like the frequency described in claim 1 to 9 any one
Frequency distribution module.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111407229A (en) * | 2019-01-07 | 2020-07-14 | 四川锦江电子科技有限公司 | Novel electrophysiological filter circuit implementation method |
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