CN208479599U - A kind of frequency distribution module and time-frequency equipment that frequency is configurable - Google Patents
A kind of frequency distribution module and time-frequency equipment that frequency is configurable Download PDFInfo
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- CN208479599U CN208479599U CN201820778247.XU CN201820778247U CN208479599U CN 208479599 U CN208479599 U CN 208479599U CN 201820778247 U CN201820778247 U CN 201820778247U CN 208479599 U CN208479599 U CN 208479599U
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Abstract
The utility model 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 road N by power distributing circuit according to the frequency distribution instruction received by radio frequency signal processing circuit, is exported after filter circuit filters.Further, the time-frequency equipment configured with the frequency distribution module is also disclosed.The distribution of the radiofrequency signal of multi-frequency can be solved 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 utility model relates to private radio communication industries, are a kind of frequency distribution modules for time-frequency equipment.
Background technique
Mark frequency signal refers to that the single-frequency value sine-wave oscillation signal that can provide high accuracy, 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 in size, 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 disadvantages of larger.Therefore, high-precision scale frequency signal usually selects atomic frequency standard, and current atom frequency marking mainly has Cs atom frequency
Mark, Rb atom frequency marking and Hydrogen Atom Frequency Standard, wherein Rb atom frequency marking is with small in size, price is relatively low, preheating is fast, index
The advantages that excellent, low in energy consumption, is able to achieve 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,
Filtering processing, the mark frequency signal of output multi-channel multi-frequency provide the user with the mark frequency signal reference of Low phase noise, high stable, are
The important component of the systems such as communication, navigation.Marking frequency distribution module is one of module 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 that can distribute different frequency is respectively configured.
Utility model content
In view of the above-mentioned problems, the utility model provides a kind of frequency distribution module for time-frequency equipment and has this frequency
The time-frequency equipment of rate distribution module, main purpose are to meet different user to export different frequency and not to time-frequency equipment mark frequency signal
With the demand of quantity, which can solve the distribution of the radiofrequency signal of multi-frequency simultaneously, to substantially reduce setting for module
Meter, production work amount, improve the ease of use and maintainability of user.
The technical solution of the utility model is:
A kind of frequency distribution module that frequency is configurable, comprising: microprocessor circuit is configured with and communicates to connect with host computer
Microprocessor；Radio frequency signal processing circuit, the filter circuit configured with power distributing circuit and the parallel connection of the road N are every to filter all the way
Circuit configuration has a filtering switch unit, and the filtering switch unit has 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 greater than 1；
Power circuit provides power 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 power distributing circuit is instructed according to the frequency distribution received,
The external radio frequency main signal of input is distributed into the same radio on the road N by radio frequency signal processing circuit, then by filtered electrical
It is exported after the filtering of road.
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 greater 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 greater 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 for distributing power distributing circuit in enabled instruction control radio frequency signal processing circuit according to frequency is enabled, to activate or close point
With output.
As a preferred embodiment, radio frequency signal processing circuit further includes the road the N put-through channel in parallel with filter circuit, is led to
Switching of the RF switch realization to filter circuit and put-through channel is crossed, for detecting the working condition of 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 pass 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, is mutually isolated radiofrequency signal, will not mutual cross talk effects.
As a preferred embodiment, the microprocessor selects arm processor chip.
As a preferred embodiment, the power circuit includes DC/DC switch buck filter circuit and LDO linear voltage stabilization
Circuit, DC/DC switch buck filter circuit are used to high voltage input being converted into low-voltage output；LDO linear voltage-stabilizing circuit packet
The first LDO linear voltage-stabilizing circuit and the 2nd LDO linear voltage-stabilizing circuit are included, the first LDO linear voltage-stabilizing circuit is for switching DC/DC
The low pressure of decompression filter circuit output works to radio frequency signal processing circuit after being handled and uses；2nd LDO linear voltage stabilization electricity
Road is used for working after being handled the low pressure that DC/DC switch buck filter circuit exports to microprocessor circuit, to reach
To the noise for not only reducing radio circuit power supply and digital circuit power source, but also improve mutually isolated effect.Preferably, power circuit
Including DC/DC switch buck filter circuit and LDO linear voltage-stabilizing circuit, DC/DC switch buck filter circuit input 24V output+
High voltage input is converted into low-voltage output by 6V voltage；LDO linear voltage-stabilizing circuit include the first LDO linear voltage-stabilizing circuit and
2nd LDO linear voltage-stabilizing circuit, the first LDO linear voltage-stabilizing circuit input+6V output+5V voltage give radio frequency signal processing circuit
Work uses；2nd LDO linear voltage-stabilizing circuit input+6V output+3.3V voltage works to microprocessor circuit and uses.
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 greater 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, a kind of time-frequency equipment is also disclosed in the utility model, can match configured with frequency as characterized above
The frequency distribution module set.
The utility model has the advantages that
(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) number 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) RF power sensing circuit for passing through radio frequency signal processing circuit input/output terminal, realizes frequency distribution module
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 filters and through path different in filter circuit, brings
Insertion loss to mark 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) based on the utility model proposes frequency distribution module, time-frequency equipment can be allowed to have rate-adaptive pacemaker configurable
Ability is not limited to mark frequency division and matches, so that the scope of application of frequency distribution is expanded, to meet multi-user's different demands.
Detailed description of the invention
Fig. 1 is frequency distribution module composition block diagram 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 filter emulates frequency response figure in embodiment；
Fig. 7 is that 5MHz low-pass filter emulates frequency response figure in embodiment；
Fig. 8 is that 10MHz low-pass filter emulates 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 embodiment
3U (100mm can be used in the configurable frequency distribution module of frequency disclosed in the utility model frequency distribution module
× 160mm) calibrated altitude, 4HP (1HP=5.08mm) width structure form, with apparatus back board low frequency signal interconnection select it is firm
110 core ribbon bits of coded CPCI standard connector of durable type, radiofrequency signal interconnection select SBMA can floating blind plugging formula radio frequency connector.
The mark rate distribution module is mainly by power voltage step down, filtering, current detection circuit (i.e. power circuit), radiofrequency signal inspection
It surveys, amplification, distribution, filtering processing circuit (i.e. radio frequency signal processing circuit), microprocessor detection, communication, control, management circuit
(i.e. microprocessor circuit) composition.After the radiofrequency signal of any one pre-set frequency of external input, radio frequency can be passed through
The identical radiofrequency signal in partial circuit distribution three tunnels of output, signal assignment frequency can by microprocessor to radio circuit into
The switching of row software configuration, input radio frequency signal (i.e. input signal) and output radiofrequency signal (i.e. output signal) pass through function respectively
After rate detection, A/D sampling is carried out to microprocessor, whether normally whether there is or not with to judge signal.Module passes through bus communication interface
It is communicated and is managed with equipment, configure present operating frequency, reporting module working condition and input and output radio frequency interface signal
State.By externally input 24V power voltage step down, outputting high quality, low ripple+3.3V and+5V are electric for power voltage step down, filter circuit
Pressure is used for chip in module and active circuit, and current detection circuit is by real-time detection current working current, by microprocessor
After A/D sampling, whether judgment module active circuit working condition is abnormal.When occurring abnormal, pass through bus communication interface in time
It is reported to equipment.
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, a kind of specific embodiment of frequency distribution module of frequency Design of Signal is marked below for these three.
As shown in Figure 1, being disclosed in embodiment a kind of for exporting the frequency point of tri- kinds of 1MHz, 5MHz, 10MHz mark frequency signals
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, the voltage value V to facilitate microprocessor samples, after samplinginWith two reference voltage Vref1With
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 judgement 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 mainly passes through the circuit and completes, believes
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 Vref3And Vref4Compare, reference voltage Vref3And Vref4According to true after modular debugging actual measurement
It is fixed, and be recorded in module software.Whether normally whether there is or not the judgement in accordance with the following methods with for signal:
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, judgement, decision, control section of the module, mainly passes through it
The software realization of storage, while the module is communicated with equipment (host computer) by microprocessor, the management of accepting device with
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 supply is converted, reduced output voltage+3.3V ,+5V voltage by DC/DC and LDO voltage, and the output of the road Bing Duimei carries out power filter
Processing guarantees the quality of out-put supply, reduces power supply ripple to the crosstalk 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 is normal to judge 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, 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 layer, L2 bus plane, the stratum L3, L4 signals layer.Radiofrequency signal mainly passes through L4 signals layer
Cabling, characteristic impedance reference layer are the stratum L3, by the impedance matching property of control mark frequency signal, 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 type, set in embodiment there are four, input and output mark frequency signal pass through the connector and equipment
Backboard interconnection can effectively ensure that the indexs performances such as characteristic impedance, insertion loss, the isolation of mark frequency signal, while the connection
Feature that device 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 connector, which is 110 core of Durable solar 2.0mm spacing, is had anti-
Error location pin is able to satisfy 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 play shielding action for radio frequency part circuit, 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 frequency, 512K
Byte FLASH program memory possesses USB, CAN, 11 timers, 3 12 ADC converters, up to 13 communication interfaces
With the resources such as multiple quick multifunctionals are I/O mouthfuls two-way, the demands such as control, the communication of the module are fully met, and have very big
Expansible 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 external power supply power voltage step down circuit, provides+3.3V working power for microprocessor.
11 be module operating current detection circuit, and the voltage signal after conversion 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 by CAN bus with host computer.
13 be no source crystal, and after connecting 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 be inputted instruction with print software work state information, be inquired 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 sampling
State.
18 be that output mark frequency signal power detection signal judges output mark frequency signal shape after microprocessor A/D sampling
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 by the interface to match corresponding setting.
Through the above scheme, the mark frequency division that microprocessor circuit receives that host computer issues is matched 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, whether in the normal range signal strength be judged, to judge to believe
Number whether there is or not report to host computer judging result timing；Microprocessor circuit can also real-time detection module operating voltage and disappear
Power consumption stream, wherein operating voltage includes the 24V voltage inputted in power circuit, 3.5V the and 5V voltage of output, consumes electric current
The total current being primarily referred to as, and judge whether in the normal range, to report when occurring abnormal to host computer.Further, micro- place
Reason device circuit can be configured with enabled command signal input terminal, the enabled instruction issued for receiving host computer, and according to making
It can instruct whether 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, distribution, then passes through the filter group of different operating frequency, the mark frequency signal of different output frequencies is carried out different
Filtering, reaches optimal 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 every road output shows its working condition by power detection.Radio frequency signal processing circuit its can connect
It is enabled by control distribution chip operation by the control for microprocessor, 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 to mark frequency signal coupling circuit, by coupling, the signal of sub-fraction power is separated from radio frequency main signal, not
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 real-time monitoring main signal.
22 be RF power sensing circuit, and the main active wave detector chip for using ADI company passes through the signal of input
After quadratic detection, with the amplifier amplification that square law circuit is feedback, have using output after Hyblid Buffer Amplifier with input signal
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, certain power gain is provided, to input
Mark frequency signal amplify, meet the wider power bracket of input signal, and itself generates lower noise, will not be biggish
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) switch, 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 respectively corresponds 1MHz, 5MHz, 10MHz, leads directly to) should be apparent that penetrating for selection
Frequency switch insertion loss is to mark frequency effect of signals very little, and each switch isolation degree is greater than 45dB, and two switch isolation degree are greater than
90dB will not influence the stopband rejection of filter, fully meet requirement.
28 be 1MHz low-pass filter, 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, is based on the structure, by obtaining after emulation
Inductance and capacitance component value in table 1.Fig. 6 is that 1MHz low-pass filter emulates frequency response figure, as seen from the figure the low-pass filter
With lower insertion loss, while stopband inhibits higher, and 1MHz mark the primary, secondary of frequency signal, triple-frequency harmonics can reach
The inhibition of 80dB or more, therefore, amplified mark frequency signal is isolated can guarantee harmonics restraint 85dB or more after filtering substantially
High performance index.
Table 1
29 be 5MHz low-pass filter, which uses elliptic function structure, structural schematic diagram same Fig. 5, Fig. 7
Frequency response figure is emulated for 5MHz low-pass filter, table 2 is 5MHz low-pass filter component values.The stopband of the low-pass filter inhibits
Ability is stronger, can equally guarantee 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 filter, which uses elliptic function structure, the same Fig. 5 of structural schematic diagram, figure
8 emulate frequency response figure for 10MHz low-pass filter, and table 2 is 10MHz low-pass filter component values.The stopband of the low-pass filter
Rejection ability is stronger, can equally guarantee 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 Vref3And Vref4Compare, with
Judging output signal, normally whether there is or not with.32 be mark frequency output signal, and the output of three road signals is 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 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 stabilization of efficient DC/DC decompression filter circuit and low noise
Road, while guaranteeing 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 voltage mainly works to digital circuits such as microprocessors and uses, and+5V the voltage of power supply output mainly gives radio frequency part circuit
Work uses, and makes have higher isolation between the two-way voltage of output by LDO linear voltage stabilization filter circuit, is avoided that digital electricity
Power supply crosstalk between road and radio circuit guarantees radiofrequency signal index performance.
It is used to export the frequency distribution module of tri- kinds of 1MHz, 5MHz, 10MHz mark frequency signals described in embodiment below
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 signal, if
It is standby to be worked by setting frequency distribution module in 1MHz state, 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 connecting 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 detection: the module can carry out function 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 the utility model, the distribution of multi-frequency can be achieved at the same time,
And be not limited to mark frequency division and match, the versatility of module is improved, the application scenarios of module are expanded.Also, it is detected by these, it can
With good display module current working status, the unusual condition occurred is grasped immediately, it is with higher from sensing capability.
Although the embodiments of the present invention are described in conjunction with attached drawing above, the utility model does not limit to
In above-mentioned specific embodiments and applications field, above-mentioned specific embodiment is only schematical, directiveness, without
It is restrictive.Those skilled in the art under the enlightenment of this specification, are not departing from the utility model claims
In the case where the range protected, a variety of forms can also be made, these belong to the column of the utility model protection.
Claims (10)
1. a kind of configurable frequency distribution module of frequency characterized by comprising
Microprocessor circuit, configured with the microprocessor communicated to connect with host computer；
Radio frequency signal processing circuit, the filter circuit configured with power distributing circuit and the parallel connection of the road N are configured per filter circuit all the way
There is a filtering switch unit, the filtering switch unit has RF switch and M filter in parallel, and the filter is low
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 greater than 1；
Power circuit, for providing power supply for radio frequency signal processing circuit and microprocessor circuit；
The microprocessor circuit is used to receive the frequency distribution instruction that host computer issues, and frequency distribution instruction is sent to radio frequency
Signal processing circuit, and distribute instruction control RF switch according to frequency and connect corresponding filter；The radiofrequency signal processing
Circuit is used to be distributed into the external radio frequency main signal of input by power distributing circuit according to the frequency distribution instruction received
The same radio on the road N, 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 coupling circuit of each filter circuit output end and with it
The second RF power sensing circuit connect；First signal coupling circuit and second signal coupling circuit 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 be also used to according to receive radio frequency signal processing circuit output sampled voltage signal judgement input,
The signal condition of output signal, and reported supreme position machine.
3. frequency distribution module as described in claim 1, which is characterized in that the RF switch selects single pole multiple throw.
4. frequency distribution module as described in claim 1, which is characterized in that the filter uses Elliptic Function Type LC low pass
Or bandpass filter.
5. frequency distribution module as described in claim 1, which is characterized in that be each equipped with isolation amplification in each road filter circuit
Device.
6. frequency distribution module as described in claim 1, which is characterized in that the input terminal of the power distributing circuit is configured with
Low noise amplifier circuit.
7. frequency distribution module as described in claim 1, which is characterized in that the microprocessor selects arm processor chip.
8. frequency distribution module as described in claim 1, which is characterized in that the power circuit includes DC/DC switch buck
Filter circuit and LDO linear voltage-stabilizing circuit, DC/DC switch buck filter circuit are used to high voltage input being converted into low-voltage defeated
Out；LDO linear voltage-stabilizing circuit includes the first LDO linear voltage-stabilizing circuit and the 2nd LDO linear voltage-stabilizing circuit, and the first LDO is linearly steady
Volt circuit after being handled the low pressure that DC/DC switch buck filter circuit exports to radio frequency signal processing circuit work for making
With；2nd LDO linear voltage-stabilizing circuit is for giving micro process after being handled the low pressure that DC/DC switch buck filter circuit exports
The work of device circuit uses.
9. frequency distribution module as claimed in claim 8, which is characterized in that
The power circuit further includes operating current detection circuit, and current working current is converted into operating voltage letter for it
Number, and export to microprocessor circuit；
The microprocessor circuit is also used to detect the operating voltage signal that power circuit exports, to judge power circuit
Working condition, and reported supreme position machine.
10. a kind of time-frequency equipment, which is characterized in that distribute mould configured with frequency as claimed in any one of claims 1 to 9
Block.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820778247.XU CN208479599U (en) | 2018-05-24 | 2018-05-24 | A kind of frequency distribution module and time-frequency equipment that frequency is configurable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820778247.XU CN208479599U (en) | 2018-05-24 | 2018-05-24 | A kind of frequency distribution module and time-frequency equipment that frequency is configurable |
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| CN208479599U true CN208479599U (en) | 2019-02-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599783A (en) * | 2018-05-24 | 2018-09-28 | 南京熊猫电子股份有限公司 | A kind of frequency distribution module that frequency is configurable |
| CN117032394A (en) * | 2023-10-08 | 2023-11-10 | 成都世源频控技术股份有限公司 | High-frequency accuracy reference clock source |
-
2018
- 2018-05-24 CN CN201820778247.XU patent/CN208479599U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599783A (en) * | 2018-05-24 | 2018-09-28 | 南京熊猫电子股份有限公司 | A kind of frequency distribution module that frequency is configurable |
| CN117032394A (en) * | 2023-10-08 | 2023-11-10 | 成都世源频控技术股份有限公司 | High-frequency accuracy reference clock source |
| CN117032394B (en) * | 2023-10-08 | 2024-02-06 | 成都世源频控技术股份有限公司 | High-frequency accuracy reference clock source |
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