CN105322917A - A 30MHz-512MHz wide frequency band frequency hopping filter - Google Patents
A 30MHz-512MHz wide frequency band frequency hopping filter Download PDFInfo
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Abstract
The invention provides a 30MHz-512MHz wide frequency band frequency hopping filter which is used for an ultrashort wave 30MHz-512MHz frequency band receiver radio frequency front end. The 30MHz-512MHz wide frequency band frequency hopping filter comprises first-fifth electrically tunable filters with the same structure, a first radio frequency switch SP6T-1, a second radio frequency switch SP6T-2, an MCU and an operational amplifier. The SP6T-1 and the SP6T-2 are separately connected with the front ends and the rear ends of the first-fifth electrically tunable filters and are also connected with an input radio frequency connector RFin and an output radio frequency connector RFout respectively. The first-fifth electrically tunable filters divide the 30MHz-512MHz frequency band into five sub-frequency bands, each electrically tunable filter covering one sub-frequency band. The MCU is internally provided with a D/A converter and a group of GPIO interfaces, is connected with the first radio frequency switch SP6T-1 and the second radio frequency switch SP6T-2 through the GPIO interfaces and controls on-off of the radio frequency switches through the GPIO interfaces to realize the switching of the first-fifth electrically tunable filters. According to the invention, narrow-band band pass filtering in the 30MHz-512MHz full frequency band range is realized through control of the tuning frequency, and non-fluctuation smooth transition can be realized in the full frequency band.
Description
Technical field
The present invention designs wireless communication field, especially a kind of 30MHz ~ 512MHz wide-band bounce frequency filter.
Background technology
In the systems such as communication, radar, radio-frequency filter is as one of the most indispensable components and parts, decide the quality of the quality and performance of whole system, bounce frequency filter, as novel frequency-selecting filter assembly, obtains applying more and more widely in tracking frequency-hopping communication system.In modern war, U.S. army has started progressively apply and reach its maturity, and China has also carried out large quantifier elimination to bounce frequency filter technology in recent years, in all types of jam-resistant communication systems, also start extensive use.
Along with the development of military communication, traditional frequency fixing communication mode is fixed due to its carrier frequency, poor anti jamming capability, therefore be easy to be intercepted and captured by enemy and locate in actual combat, thus expose orientation, communication equipment place and the Content of Communication of one's own side, and Frequency-hopping Communication Technology is anti-fading, Anti TBIgG, there is superior performance the aspect such as anti-interference, in tactical communication, great attention is received in information and command system, become the research project that countries in the world are important in military communication field, bounce frequency filter is one of most important part in its communication system, there are very large design optimization space and application prospect.
Summary of the invention
Goal of the invention: the present invention proposes a kind of 30MHz ~ 512MHz wide-band bounce frequency filter, can by controlling tuned frequency, realize arrowband bandpass filtering within the scope of 30MHz ~ 512MHz full frequency band, can be applied to ground-to-ground, the ground-to-air and ultrashort wave antijam communication equipment such as air to air, realize arrowband bandpass filtering in 30MHz ~ 512MHz full frequency band; The minimum frequency stepping doing invention is less than 500kHz, can ripple disable seamlessly transit in full frequency band, fully can improve antijamming capability and the sensitivity of ultrashort wave frequency hopping station receiver.
Technical scheme: the technical scheme that the present invention proposes is: a kind of 30MHz ~ 512MHz wide-band bounce frequency filter, comprise the first to the 5th electrically tunable filter that structure is identical, first radio-frequency (RF) switch SP6T-1, second radio-frequency (RF) switch SP6T-2, MCU microcontroller and operational amplifier, first radio-frequency (RF) switch SP6T-1 and the second radio-frequency (RF) switch SP6T-2 are connected with the rear and front end of the electrically tunable filter of one of first to the 5th respectively, first to the 5th electrically tunable filter is structure in parallel, simultaneously the first radio-frequency (RF) switch SP6T-1 and the second radio-frequency (RF) switch SP6T-2 respectively with input radio frequency joint RFin, export radio-frequency joint RFout to be connected, 30MHz ~ 512MHz frequency range is divided into five frequency sub-band and covers one of them frequency sub-band respectively by the first to the 5th electrically tunable filter, the built-in D/A converter of MCU microcontroller and one group of GPIO interface, MCU microcontroller is connected with the second radio-frequency (RF) switch SP6T-2 with the first radio-frequency (RF) switch SP6T-1 respectively by GPIO interface and realizes the switching between the first to the 5th electrically tunable filter by the on off operating mode of GPIO Interface Controller radio-frequency (RF) switch, D/A converter by operational amplifier with one of first to the 5th electrically tunable filter be connected, D/A converter the discrete signal that MCU microcontroller provides is converted to direct voltage and input operational amplifier amplify after one of as first to the 5th the tuning voltage of electrically tunable filter, MCU microcontroller peripheral communication interface and power interface, MCU microcontroller is connected with the radio station main control unit of external equipment by communication interface, radio station main control unit and communication interface are according to the communication protocol specified, the operating frequency of real-time change described 30MHz ~ 512MHz wide-band bounce frequency filter, makes it to match with the operating frequency in radio station.
Further, the described first to the 5th electrically tunable filter, comprises coupling unit, resonant element I and resonant element II, and coupling unit rear and front end is connected to resonant element I and resonant element II respectively; Coupling unit comprises inductance L 4, the two ends of L5 and L6, L5 are connected with L4 with L6 respectively, the other end ground connection of L4 and L6; Resonant element I comprises inductance L 2, the two ends of L3 and variable capacitance C1, L3 are connected with the upper step of L2 with C1 respectively, the other end of L2 and subordinate's plate earthing of C1; Resonant element II comprises inductance L 7, the two ends of L8 and variable capacitance C2, L7 are connected with L8 with the upper step of C2 respectively, the lower step of C2 and the other end ground connection of L8; The tie point of L2 with L3 is connected with I/O radio-frequency joint by inductance L 1, the tie point of L3 with CI is connected with the tie point of L4 with L5, the tie point of L5 with L6 is connected with the tie point of L7 with C2, and the tie point of L7 with L8 is connected with I/O radio-frequency joint by L9; Variable capacitance C1 is identical with C2 structure, comprise the variable capacitance diode D1 to D4 that four models are identical, the negative electrode of D1, D2 is connected, the negative electrode of D3, D4 is connected, the anode of D1 is connected as the top crown of variable capacitance with the anode of D3, the anode of D2 is connected as the bottom crown of variable capacitance with the anode of D4, the tie point of D1 with D2 is connected with the tie point of D3 with D4, the tie point of D3 with D4 is connected with resistance R simultaneously, and the tuning voltage that described operational amplifier exports is applied on variable capacitance C1, C2 by resistance R.
Preferably, the frequency range that the first to the 5th electrically tunable filter covers is respectively 30 ~ 53MHz, 53 ~ 93MHz, 93 ~ 165MHz, 165 ~ 290MHz and 290 ~ 512MHz.
Preferably, between switch S P6T-1 and the second radio-frequency (RF) switch SP6T-2, be provided with direct channel, for carrying out non-filtered process to input signal or realizing self-checking function.
Further, described first radio-frequency (RF) switch SP6T-1 and the second radio-frequency (RF) switch SP6T-2 is hilted broadsword six and throws integrated RF switch chip, and the control planning truth table that integrated RF switch chip thrown by hilted broadsword six is as shown in table 1:
Table 1: hilted broadsword six is thrown integrated RF switch chip and controlled truth table
Preferably, described communication interface is SPI interface.
Preferably, the voltage range that described D/A converter exports is 0 ~ 3V, and the multiplication factor of described operational amplifier is 6 times, and the tuning voltage dynamic range that operational amplifier exports is 0V ~ 18V.
Beneficial effect: compared to the prior art the present invention, has following beneficial effect:
1, the present invention is applied to ultrashort wave 30MHz ~ 512MHz frequency range, and the outer interference signal of correlation frequency band suppresses frequency hopping communications receivers front end that is higher, communication frequency Fast transforms, effectively can improve the indexs such as the selectivity of receiver, dynamic range and sensitivity.
2, the present invention uses five sections of electrically tunable filters and radio-frequency (RF) switch, control unit composition to cover the bounce frequency filter module of 30MHz ~ 512MHz frequency range, there is the features such as wide frequency range, volume is little, opposite band width, tuned speed are fast, effectively can improve reception dynamic range and the sensitivity in frequency hopping communications radio station, increase the antijamming capability of complete machine, can be applicable to wireless antijam communication, electronic reconnaissance, digital instrument, navigation, the multiple fields such as electronic countermeasures.
3, minimum frequency stepping of the present invention is less than 500kHz, can ripple disable seamlessly transit in full frequency band, improves antijamming capability and the sensitivity of ultrashort wave frequency hopping station receiver greatly.
Accompanying drawing explanation
Fig. 1 is functional block diagram of the present invention;
Fig. 2 is electrically tunable filter structure chart;
Fig. 3 is the circuit topology figure of electrically tunable filter;
Fig. 4 is the circuit topology figure of variable capacitance;
Fig. 5 is capacitance and the reverse voltage relation analogous diagram of variable capacitance diode;
Fig. 6 is the Frequency Response analogous diagram that first paragraph electrically tunable filter covers that frequency range is 30 ~ 53MHz;
Fig. 7 is the Frequency Response analogous diagram that second segment electrically tunable filter covers that frequency range is 53 ~ 93MHz;
Fig. 8 is the Frequency Response analogous diagram that the 3rd section of electrically tunable filter covers that frequency range is 93 ~ 165MHz;
Fig. 9 is the Frequency Response analogous diagram that the 4th section of electrically tunable filter covers that frequency range is 165 ~ 290MHz;
Figure 10 is the Frequency Response analogous diagram that the 5th section of electrically tunable filter covers that frequency range is 290 ~ 512MHz;
Figure 11 is the insertion loss Frequency Response analogous diagram that integrated RF switch chip thrown by hilted broadsword six;
Figure 12 is the isolation Frequency Response analogous diagram that integrated RF switch chip thrown by hilted broadsword six;
Figure 13 is MCU microprocessor controls relation block diagram;
Figure 14 is 30MHz ~ 512MHz bounce frequency filter full frequency band Frequency Response analogous diagram;
Figure 15 is the module outline drawing of 30MHz ~ 512MHz bounce frequency filter;
Figure 16 is SPI interface sequence figure;
Figure 17 is embodiment of the present invention workflow diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
The present invention proposes a kind of 30MHz ~ 512MHz wide-band bounce frequency filter, its functional block diagram as shown in Figure 1, comprise the first to the 5th electrically tunable filter, the first radio-frequency (RF) switch SP6T-1, the second radio-frequency (RF) switch SP6T-2, MCU microcontroller and operational amplifier, first radio-frequency (RF) switch SP6T-1 and the second radio-frequency (RF) switch SP6T-2 are connected with the rear and front end of the first to the 5th electrically tunable filter respectively, simultaneously the first radio-frequency (RF) switch SP6T-1 and the second radio-frequency (RF) switch SP6T-2 respectively with input radio frequency joint RFin, export radio-frequency joint RFout and be connected; 30MHz ~ 512MHz frequency range is divided into five frequency sub-band and covers one of them frequency sub-band respectively by the first to the 5th electrically tunable filter; The built-in D/A converter of MCU microcontroller and one group of GPIO interface, MCU microcontroller is connected with the second radio-frequency (RF) switch SP6T-2 with the first radio-frequency (RF) switch SP6T-1 respectively by GPIO interface and realizes the switching between the first to the 5th electrically tunable filter by the on off operating mode of GPIO Interface Controller radio-frequency (RF) switch; D/A converter is connected with the first to the 5th electrically tunable filter by operational amplifier, D/A converter the discrete signal that MCU microcontroller provides is converted to direct voltage and input operational amplifier amplify after the tuning voltage of the as first to the 5th electrically tunable filter; MCU microcontroller peripheral communication interface and power interface, MCU microcontroller is connected with the radio station main control unit of external equipment by communication interface, radio station main control unit and communication interface are according to the communication protocol specified, the operating frequency of real-time change described 30MHz ~ 512MHz wide-band bounce frequency filter, makes it to match with the operating frequency in radio station.
As a preferred embodiment of the present invention, the frequency range of five sections of electrically tunable filters divides to be determined based on the calculating of harmonics restraint optimum mode, and segment frequence exploitation method is as follows:
30×n
5＝512
f
0＝30×n
0＝30×1.7637
0＝30MHz；
f
1＝30×n
1＝30×1.7637
1＝52.911≈53MHz；
f
2＝30×n
2＝30×1.7637
2＝93.3191307≈93MHz；
f
3＝30×n
3＝30×1.7637
3＝164.58695081559≈165MHz；
f
4＝30×n
4＝30×1.7637
4＝290.282005153456083≈290MHz；
f
5＝30×n
5＝30×1.2063
5＝511.9703724891504935871≈512MHz；
In formula, n is the multiple that division frequency increases progressively from low to high successively.The frequency range obtaining the first to the 5th electrically tunable filter covering is thus respectively 30 ~ 53MHz, 53 ~ 93MHz, 93 ~ 165MHz, 165 ~ 290MHz and 290 ~ 512MHz.
To the design of the first to the 5th electrically tunable filter
The basic role of filter selects frequency signal, the frequency needed elected, and curbs unwanted frequency.The Insertion Loss size that signal is produced by filter, to the rejection ability of unwanted frequency, is the subject matter that design of filter is concerned about.The tuning manner of electrically tunable filter is generally realize the change of frequency by the size of capacitance in change resonant circuit, and the structure of electrically tunable filter as shown in Figure 2.In figure, resonant element comprises inductance and electric capacity, inductance is according to the difference of frequency range and inductance value, magnetic core wire-wound inductor and hollow wire-wound inductor can be used, electric capacity generally selects variable capacitance diode or switched capacitor array, realized the change of resonance frequency by the capacitance controlling variable capacitance diode or switched capacitor array, coupling unit is divided into capacitive coupling and inductance coupling high two kinds of modes, finds through design of Simulation, the relative bandwidth of capacitive coupling is wider, is unfavorable for bandwidth optimized design.
Based on above-mentioned design analysis conclusion, the present invention is based on inductance direct coupling system and the first to the 5th electrically tunable filter is designed.In order to improve the passband selectivity of electrically tunable filter, add coupling inductance L4 and L6, the coupling coefficient of coupling unit determines, under different working frequency range primarily of the inductance value of L4, L5, L6, the inductance value of coupling inductance needs adjustment adaptive, to reach optimum coupling coefficient.In the preferred embodiments of the present invention, the first to the 5th electrically tunable filter structure is identical, and physical circuit topological diagram as shown in Figure 3, comprises coupling unit, resonant element I and resonant element II, and coupling unit rear and front end is connected to resonant element I and resonant element II respectively; Coupling unit comprises inductance L 4, the two ends of L5 and L6, L5 are connected with L4 with L6 respectively, the other end ground connection of L4 and L6; Resonant element I comprises inductance L 2, the two ends of L3 and variable capacitance C1, L3 are connected with the upper step of L2 with C1 respectively, the other end of L2 and subordinate's plate earthing of C1; Resonant element II comprises inductance L 7, the two ends of L8 and variable capacitance C2, L7 are connected with L8 with the upper step of C2 respectively, the lower step of C2 and the other end ground connection of L8; The tie point of L2 with L3 is connected with I/O radio-frequency joint by inductance L 1, the tie point of L3 with CI is connected with the tie point of L4 with L5, the tie point of L5 with L6 is connected with the tie point of L7 with C2, and the tie point of L7 with L8 is connected with I/O radio-frequency joint by L9.Wherein, L1, L2, L3 and L7, L8, L9 form the input of electrically tunable filter, the impedance matching of output respectively.
Variable capacitance C1 is identical with C2 structure, its circuit topology figure as shown in Figure 4, comprise the variable capacitance diode D1 to D4 that four models are identical, the negative electrode of D1, D2 is connected, the negative electrode of D3, D4 is connected, the anode of D1 is connected as the top crown of variable capacitance with the anode of D3, the anode of D2 is connected as the bottom crown of variable capacitance with the anode of D4, the tie point of D1 with D2 is connected with the tie point of D3 with D4, the tie point of D3 with D4 is connected with resistance R simultaneously, and the tuning voltage that described operational amplifier exports is applied on variable capacitance C1, C2 by resistance R.Variable capacitance C1, C2 adopt this to the reverse series parallel topology structure of pipe, the linearity be better than other structures such as single tube and there is no two, third order intermodulation.
Use software emulation tool to carry out Computer Aided Design respectively to first to the 5th section of electrically tunable filter, show that each frequency range component parameter table is as shown in table 1:
Table 1: component parameter table
First paragraph to the Frequency Response analogous diagram of the 5th section of electrically tunable filter as shown in Fig. 6 ~ 10, in this design of Simulation, first to the 5th section of electrically tunable filter covers frequency range and is respectively 30 ~ 53MHz, 53 ~ 93MHz, 93 ~ 165MHz, 165 ~ 290MHz and 290 ~ 512MHz.
As can be found from Table 1, inductance value and the capacitor's capacity of the higher inductance of frequency range are less, the inductance that inductance value is larger needs to use the enamelled wire of about 0.2mm to be evenly wound on toroidal core and realizes, air core inductor is processed in the rotary head that the inductance that inductance value is less can use 0.4mm ~ 0.6mm enamelled wire to be wound on about 3mm, the wire diameter of enamelled wire can have influence on the Q value of the good inductance of coiling, the Q value of therefore taking thicker enamelled wire inductance is higher, the Insertion Loss of filter is less, also be more not easy distortion, anti-shake performance is better.When selecting toroidal core, the magnetic permeability due to core material can be subject to the impact of operating frequency, temperature and time, therefore needs to select core loss little, and temperature system is low, and to time stable core material.Need the impact, particularly distributed capacitance that reduce distributed constant when printed board layout designs as far as possible, need to be included in filter parameter and consider in the lump, do suitable compensation optimizing.
When selecting variable capacitance diode, the indexs such as main consideration its linearity, the tuning range of electric capacity, maximum tuning voltage are higher in the capacitance of low band resonance electric capacity, tuning range is wider, and when high band, requiring that the minimum value of electric capacity is less, high frequency characteristics will be got well.Therefore the present embodiment is to each frequency range type selecting respectively, have employed the variable capacitance diode models such as BB152, BB153, BB135, BB131 of NXP company, the typical capacitance of capister and reverse voltage relation as shown in Figure 5, mainly select middle more linear working region in force.
Radio-frequency switch circuit designs
Radio-frequency (RF) switch is the key components in wireless communication system transceiver unit, and it is widely used in radio frequency, microwave component and system, as phased array antenna, and phase shifter and bank of filters etc.In order to realize seamlessly transitting of five sections of electrically tunable filters, need to carry out gating switching with switch, common switch has relay switch, PIN switch and integrated switch, and their feature is as follows respectively:
Relay switch is a kind of mechanical switch, primarily of compositions such as iron core, coil, armature, contact reed, as long as add certain voltage at coil two ends, certain electric current will be flow through in coil and produce galvanomagnetic effect, thus the moving contact of band moving armature and fixed contact adhesive, realize the action of switch.But owing to being mechanical type folding, its slow about about the 1ms of switching speed, can not meet the requirement switched at a high speed.
PIN switch utilizes PIN diode to realize in the characteristic of different bias voltage, near short circuit conducting when forward dc is biased, approximate open circuit during reverse bias.It has the fast and small loss and other features of switching speed.
Integrated switch is by a single die integrated for multiple transistor, and achieve the miniaturization of switch, integrated level and reliability are all higher, and its switching speed is also very fast simultaneously, and control voltage is lower, is more conducive to the direct control of main control chip.Therefore select the filter with low insertion loss integrated RF switch chip that a kind of hilted broadsword six is thrown in a preferred embodiment of the invention, the specific performance parameter of filter with low insertion loss integrated RF switch chip is as shown in table 2:
Table 2: the specific performance parameter list of filter with low insertion loss integrated RF switch chip
| Index | Frequency | Minimum | Typical case | Maximum | Unit |
| Insertion loss | DC-1.0GHz | 0.8 | 1.2 | dB | |
| Isolation | DC-1.0GHz | 38 | 41 | dB | |
| Return loss | DC–2.5GHz | 14 | 18 | dB | |
| Input P1dB compression point power | 0.3-3.0GHz | 21 | 24 | dBm |
| Switching time | 0.1-1.0GHz | 35 | ns |
Figure 11 is the insertion loss Frequency Response analogous diagram that integrated RF switch chip thrown by hilted broadsword six; Figure 12 is the isolation Frequency Response analogous diagram that integrated RF switch chip thrown by hilted broadsword six; The control planning that integrated RF switch chip thrown by hilted broadsword six is as shown in table 3:
Table 3: hilted broadsword six is thrown integrated RF switch chip and controlled truth table
Wherein, A1, B1, C1, A2, B2, C2 are respectively 6 contact point numberings that integrated RF switch chip thrown by hilted broadsword six, the present embodiment adopts two hilted broadswords six to throw integrated RF switch chip, be respectively the first radio-frequency (RF) switch SP6T-1 and the second radio-frequency (RF) switch SP6T-2, direct channel is provided with, for carrying out non-filtered process to input signal or realizing self-checking function between SP6T-1 and SP6T-2.
Design on control circuit
MCU microcontroller is mainly used in the control of radio frequency on off state and the output of frequency tuning voltage, the resource needed during type selecting mainly contains GPIO mouth, DAC, SPI interface etc., in order to can power consumption be reduced and reduce volume, select the MCU microcontroller that the suitable encapsulation of resource is less as far as possible, MCU by determining after alternative in the preferred embodiment of the invention comprises 8051 micro-processor kernels at a high speed, 12 DAC, 10 ADC, internal reference a reference source, programmable comparator, 16 GPIO mouths etc., 48 pin TQFP encapsulate, volume is very little, solderability and maintenanceability fine, convenient production and debugging.
Operational amplifier is the dynamic range in order to improve tuning voltage, need that there is higher voltage fan-out capability, the D/A converter output area built-in due to the MCU microcontroller selected in this preferred embodiment is 0 ~ 3V, do not reach and control the tuning requirement of electrically tunable filter, therefore maximum supply power voltage is adopted to be the low noise operational amplifier of 36V in a preferred embodiment of the invention, the homophase DC amplification circuit of Design enlargement 6 times, D/A converter output signal linearity is exaggerated 6 times, the out-put dynamic range of tuning voltage is made to be 0V ~ 18V, meet the requirement of each section of maximum tuned frequency of electrically tunable filter and leave certain surplus.
30MHz ~ 512MHz bounce frequency filter performance and interface specification
The module outline drawing of 30MHz ~ 512MHz bounce frequency filter as shown in figure 15, the external interface of 30MHz ~ 512MHz bounce frequency filter comprises power interface, communication interface, input radio frequency joint RFin and exports radio-frequency joint RFout, wherein, communication interface preferably adopts high speed full duplex serial SPI interface, and the sequential chart of SPI interface as shown in figure 16.30MHz ~ 512MHz bounce frequency filter to inner joint as shown in figure 13,30MHz ~ 512MHz bounce frequency filter is internally, external interface functional parameter table is as shown in table 4:
Table 4:30MHz ~ 512MHz bounce frequency filter is internal, external interface functional parameter table
| Sequence number | Interface definition | Signal type | Sense | Signal level | Functional description |
| 1 | RF IN | Radio frequency | IN | Radio-frequency input signals | |
| 2 | RF OUT | Radio frequency | OUT | Radio frequency output signal | |
| 3 | SDO | Numeral | OUT | 0/3.3V | SPI data export |
| 4 | SDI | Numeral | IN | 0/3.3V | SPI data input |
| 5 | SCLK | Numeral | IN | 0/3.3V | SPI clock |
| 6 | CS | Numeral | IN | 0/3.3V | SPI is enable |
| 7 | +5V | Simulation | IN | Power supply | |
| 8 | +24V | Simulation | IN | Power supply | |
| 9 | GND | Ground |
30MHz ~ 512MHz wide-band bounce frequency filter passes through design and simulation, obtain shown in Figure 14 for 30MHz ~ 512MHz bounce frequency filter full frequency band Frequency Response analogous diagram, can find out that from figure the passband selecting frequency characteristic of filter is better, Out-of-band rejection meets the demands, and full frequency band controls to adjust voltage transformation to achieve with electricity by switch combination and seamlessly transits.Good double tunning Chebyshev Frequency Response is all had under each tuned frequency, 3dB relative bandwidth is all within 5 ~ 10%, and rectangular system is not more than 7, Insertion Loss 3 ~ 5.5dB in center in passband, input maximum standing-wave ratio and be not more than 2, meet frequency hopping communications passband and stopband requirement.
Figure 17 shows that the workflow diagram based on above-mentioned decision design mode embodiment, comprise the following steps:
MCU microcontroller initialization after step 1:30MHz ~ 512MHz wide-band bounce frequency filter powers on;
Step 2:MCU microcontroller carries out initialization to 30MHz ~ 512MHz wide-band bounce frequency filter internal module and carries out non-filtered process by direct channel to input signal or carry out self-inspection;
Step 3:30MHz ~ 512MHz wide-band bounce frequency filter is connected by SPI interface with the radio station main control unit of external equipment and receives data;
Step 4:30MHz ~ 512MHz wide-band bounce frequency filter judges whether to receive data, if do not receive, then returns step 3 and continues data receiver; If receive data, then enter step 5;
Step 5: read data and judge whether these data are frequency control data, if not frequency control data, then return step 3; If frequency control data, then enter step 6;
Step 6: frequency control data is resolved, and throw integrated RF switch chip control truth table according to the data query hilted broadsword six after resolving, control hilted broadsword six is thrown integrated RF switch chip and is carried out switching and output switching result to the first to the 5th electrically tunable filter, continues step 3.
After test, the main performance index that 30MHz ~ 512MHz wide-band bounce frequency filter realizes is as shown in table 5:
Table 5:30MHz ~ 512MHz wide-band bounce frequency filter performance index table
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. 30MHz ~ 512MHz wide-band bounce frequency filter, it is characterized in that, comprise the first to the 5th electrically tunable filter that structure is identical, first radio-frequency (RF) switch SP6T-1, second radio-frequency (RF) switch SP6T-2, MCU microcontroller and operational amplifier, first radio-frequency (RF) switch SP6T-1 and the second radio-frequency (RF) switch SP6T-2 are connected with the rear and front end of the electrically tunable filter of one of first to the 5th respectively, first to the 5th electrically tunable filter is structure in parallel, simultaneously the first radio-frequency (RF) switch SP6T-1 and the second radio-frequency (RF) switch SP6T-2 respectively with input radio frequency joint RFin, export radio-frequency joint RFout to be connected, 30MHz ~ 512MHz frequency range is divided into five frequency sub-band and covers one of them frequency sub-band respectively by the first to the 5th electrically tunable filter, the built-in D/A converter of MCU microcontroller and one group of GPIO interface, MCU microcontroller is connected with the second radio-frequency (RF) switch SP6T-2 with the first radio-frequency (RF) switch SP6T-1 respectively by GPIO interface and realizes the switching between the first to the 5th electrically tunable filter by the on off operating mode of GPIO Interface Controller radio-frequency (RF) switch, D/A converter by operational amplifier with one of first to the 5th electrically tunable filter be connected, D/A converter the discrete signal that MCU microcontroller provides is converted to direct voltage and input operational amplifier amplify after one of as first to the 5th the tuning voltage of electrically tunable filter, MCU microcontroller peripheral communication interface and power interface, MCU microcontroller is connected with the radio station main control unit of external equipment by communication interface, radio station main control unit and communication interface are according to the communication protocol specified, the operating frequency of real-time change described 30MHz ~ 512MHz wide-band bounce frequency filter, makes it to match with the operating frequency in radio station.
2. a kind of 30MHz ~ 512MHz wide-band bounce frequency filter according to claim 1, it is characterized in that, described first to the 5th electrically tunable filter structure is identical, comprise coupling unit, resonant element I and resonant element II, coupling unit rear and front end is connected to resonant element I and resonant element II respectively; Coupling unit comprises inductance L 4, the two ends of L5 and L6, L5 are connected with L4 with L6 respectively, the other end ground connection of L4 and L6; Resonant element I comprises inductance L 2, the two ends of L3 and variable capacitance C1, L3 are connected with the upper step of L2 with C1 respectively, the other end of L2 and subordinate's plate earthing of C1; Resonant element II comprises inductance L 7, the two ends of L8 and variable capacitance C2, L7 are connected with L8 with the upper step of C2 respectively, the lower step of C2 and the other end ground connection of L8; The tie point of L2 with L3 is connected with I/O radio-frequency joint by inductance L 1, the tie point of L3 with CI is connected with the tie point of L4 with L5, the tie point of L5 with L6 is connected with the tie point of L7 with C2, and the tie point of L7 with L8 is connected with I/O radio-frequency joint by L9; Variable capacitance C1 is identical with C2 structure, comprise the variable capacitance diode D1 to D4 that four models are identical, the negative electrode of D1, D2 is connected, the negative electrode of D3, D4 is connected, the anode of D1 is connected as the top crown of variable capacitance with the anode of D3, the anode of D2 is connected as the bottom crown of variable capacitance with the anode of D4, the tie point of D1 with D2 is connected with the tie point of D3 with D4, the tie point of D3 with D4 is connected with resistance R simultaneously, and the tuning voltage that described operational amplifier exports is applied on variable capacitance C1, C2 by resistance R.
3. a kind of 30MHz ~ 512MHz wide-band bounce frequency filter according to claim 1, it is characterized in that, the frequency range that the first to the 5th electrically tunable filter covers is respectively 30 ~ 53MHz, 53 ~ 93MHz, 93 ~ 165MHz, 165 ~ 290MHz and 290 ~ 512MHz.
4. a kind of 30MHz ~ 512MHz wide-band bounce frequency filter according to claim 3, it is characterized in that, direct channel is provided with, for carrying out non-filtered process to input signal or realizing self-checking function between first radio-frequency (RF) switch SP6T-1 and the second radio-frequency (RF) switch SP6T-2.
5. a kind of 30MHz ~ 512MHz wide-band bounce frequency filter according to claim 4, it is characterized in that, described first radio-frequency (RF) switch SP6T-1 and the second radio-frequency (RF) switch SP6T-2 is hilted broadsword six and throws integrated RF switch chip, and the control planning truth table that integrated RF switch chip thrown by hilted broadsword six is as shown in table 1:
Table 1: hilted broadsword six is thrown integrated RF switch chip and controlled truth table
6. a kind of 30MHz ~ 512MHz wide-band bounce frequency filter according to claim 1, it is characterized in that, described communication interface is SPI interface.
7. a kind of 30MHz ~ 512MHz wide-band bounce frequency filter according to claim 1, it is characterized in that, the voltage range that described D/A converter exports is 0 ~ 3V, and the multiplication factor of described operational amplifier is 6 times, and the tuning voltage dynamic range that operational amplifier exports is 0V ~ 18V.
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| CN114710129A (en) * | 2022-04-19 | 2022-07-05 | 电子科技大学 | Electrically tunable filter and method for widening tuning range |
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