CN205754290U - General small-size high linearity linear frequency modulation microwave signal generator - Google Patents
General small-size high linearity linear frequency modulation microwave signal generator Download PDFInfo
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- CN205754290U CN205754290U CN201620454348.2U CN201620454348U CN205754290U CN 205754290 U CN205754290 U CN 205754290U CN 201620454348 U CN201620454348 U CN 201620454348U CN 205754290 U CN205754290 U CN 205754290U
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Abstract
This utility model relates to a kind of general small-size high linearity linear frequency modulation microwave signal generator, including controller, its first input end connects outside SPI interface circuitry, the first input end that its first outfan produces circuit with baseband signal is connected, its second outfan is connected with the first input end of spread spectrum circuit, the first input end of radio-frequency switch circuit receives external reference input signal, the second input that the outfan of radio-frequency switch circuit produces circuit with baseband signal is connected, baseband signal produces the outfan of circuit and is connected with the second input of spread spectrum circuit, the outfan of spread spectrum circuit is connected with the input of output drive amplification circuit, the outfan of output drive amplification circuit is connected with the input of harmonic suppression circuit, the outfan of harmonic suppression circuit is as the outfan of generator.This utility model can realize exporting various different center frequency, different bandwidth, the high linearity linear frequency modulation microwave signal in different frequency modulation cycle easily.
Description
Technical field
This utility model relates to linear frequency modulation microwave signal generator technical field, especially a kind of general small-size high linearity linear frequency modulation microwave signal generator.
Background technology
Modern radar has been the most singly to target location, the extraction of the information of speed, and requires target is carried out imaging analysis and identification, and this requires that the signal of radar emission has big broadband, to obtain High Range Resolution and to motivate other feature of target.From the point of view of electronic warfare and electronic interferences, it is desirable to signal has big bandwidth and complicated waveform and improves the disguise of signal.In order to make full use of transmitter peak power, the method for frequency modulation or phase modulation is usually used to increase signal bandwidth.The type signal that when linear FM signal is to obtain big by nonlinear Phase Modulation, width-broadband is long-pending, the outstanding advantages of this signal is that matched filtering device is insensitive to the Doppler frequency shift of echo-signal.Therefore linear FM signal be components of modern Radar system through frequently with one of signal waveform.
Produce linear FM signal and have three kinds of basic skills: the first is active technique, utilize voltage controlled oscillator (VCO) product frequency-modulated wave, control voltage by required frequency modulation rule change；The second is passive method, utilizes pulse stretching wave filter to produce linear FM signal, and the most conventional is surface acoustic wave passive matched filtering device (abbreviation SAW filter)；The third is Direct digital waveform synthesis (DDWS), utilizes DDS directly to produce linear FM signal.The first and the second two kinds are analogy methods, and its shortcoming is to realize waveform agile, and the FM signal waveform bandwidth relative narrower of generation, generation circuit are more complicated, volume is poor compared with the linearity big, FM signal；The third is Direct digital waveform synthesis (DDS), its shortcoming is that the DDS direct output frequency upper limit is relatively low, real work frequency band is narrower, and digital form is limited to current components and parts speed, the restriction of circuit technology, and mid frequency and the bandwidth of the linear FM signal directly produced are the most limited.Therefore, how to design and develop out a kind of small size, high center frequency, broadband, the linear frequency modulation microwave signal generator of high linearity have become as urgent need and solve the technical problem that.
Summary of the invention
The purpose of this utility model is to provide the general small-size high linearity linear frequency modulation microwave signal generator of a kind of small size, high center frequency, broadband, high linearity.
nullFor achieving the above object，This utility model have employed techniques below scheme: a kind of general small-size high linearity linear frequency modulation microwave signal generator，Including controller，Its first input end connects outside SPI interface circuitry，The first input end that its first outfan produces circuit with baseband signal is connected，Its second outfan is connected with the first input end of spread spectrum circuit，The first input end of radio-frequency switch circuit receives external reference input signal，The second input that the outfan of radio-frequency switch circuit produces circuit with baseband signal is connected，Baseband signal produces the outfan of circuit and is connected with the second input of spread spectrum circuit，The outfan of spread spectrum circuit is connected with the input of output drive amplification circuit，The outfan of output drive amplification circuit is connected with the input of harmonic suppression circuit，The outfan of harmonic suppression circuit is as the outfan of generator；First outfan of built-in reference circuit is connected with the second input of controller, and the second outfan of built-in reference circuit is connected with the second input of radio-frequency switch circuit；Described controller uses model to be the FPGA controller of EP1CT100I7.
Also include producing, to radio-frequency switch circuit, baseband signal, the DC voltage-stabilizing module that circuit, spread spectrum circuit, output drive amplification circuit, harmonic suppression circuit, built-in reference circuit and FPGA controller are powered respectively.
The 62 of described FPGA controller, 63,64,67 feet connect respectively JTAG download the 1 of mouth U1,5,3,9 feet；1 foot of described FPGA controller connects 2 feet of reset chip ADM812T；The 6 of described FPGA controller, 7,16,17 feet respectively connect configuration the 1 of chip EPCS1,2,6,5 feet；The 68 of described FPGA controller, 69,70,71,72,73,74,75 feet respectively with baseband signal produce circuit first input end be connected；The 22 of described FPGA controller, 23,24,25 feet first input end with spread spectrum circuit respectively is connected；10 feet of described FPGA controller and the output signal interconnection of built-in reference circuit, as the work clock of FPGA controller；The 51 of described FPGA controller, 52,53 feet respectively with SPI_CLK, SPI_DATA, SPI_SYNC pin interconnection of outside SPI interface circuitry, it is achieved and PERCOM peripheral communication.
Described baseband signal produces circuit and uses AD9954 chip, and the clock out pin interconnection of its 9 foot and radio-frequency switch circuit, as its reference clock；36,1,48,47,38,39,40,41 feet respectively with FPGA controller 68,69,70,71,72,73,74,75 feet interconnection；20,21 feet be connected to the 3 of transformator ADT1-1WT, 1 foot；6 feet of transformator ADT1-1WT export after low pass filter LFCN-80+, as the reference clock of spread spectrum circuit.
Described spread spectrum circuit uses ADF4159 chip, 22,23,24,25 feet connect the 14 of FPGA controller respectively, 15,16,17 feet；Its 9 foot linker band signal produces the outfan of low pass filter LFCN-80+ in circuit.
As shown from the above technical solution, this utility model can produce the linear frequency modulation microwave signal of high center frequency, broadband, high linearity, compared with prior art, in that context it may be convenient to realize exporting various different center frequency, different bandwidth, the high linearity linear frequency modulation microwave signal in different frequency modulation cycle.Additionally, this utility model has simple in construction, integrated level height, miniaturization, reliability is high, easy to control, output linearity FM signal mid frequency high, the linearity is high, the feature of broader bandwidth, it is adaptable to range finding, speed-measuring radar system.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model；
Fig. 2, Fig. 3, Fig. 4 are respectively FPGA controller in Fig. 1, baseband signal produces circuit, the circuit theory diagrams of spread spectrum circuit.
Detailed description of the invention
As shown in Figure 1, a kind of general small-size high linearity linear frequency modulation microwave signal generator, including controller, its first input end connects outside SPI interface circuitry, the first input end that its first outfan produces circuit 2 with baseband signal is connected, its second outfan is connected with the first input end of spread spectrum circuit 3, the first input end of radio-frequency switch circuit receives external reference input signal, the second input that the outfan of radio-frequency switch circuit produces circuit 2 with baseband signal is connected, baseband signal produces the outfan of circuit 2 and is connected with the second input of spread spectrum circuit 3, the outfan of spread spectrum circuit 3 is connected with the input of output drive amplification circuit, the outfan of output drive amplification circuit is connected with the input of harmonic suppression circuit, the outfan of harmonic suppression circuit is as the outfan of generator；First outfan of built-in reference circuit is connected with the second input of controller, and the second outfan of built-in reference circuit is connected with the second input of radio-frequency switch circuit；The FPGA controller 1 that described controller uses model to be EP1CT100I7.Also include producing circuit 2, spread spectrum circuit 3, output drive amplification circuit, harmonic suppression circuit, built-in reference circuit and the DC voltage-stabilizing module of FPGA controller 1 power supply to radio-frequency switch circuit, baseband signal respectively.Built-in reference circuit, for providing work clock for controller, simultaneously by radio-frequency switch circuit gating output, produces the reference clock of circuit as baseband signal.
As it is shown in figure 1, DC voltage-stabilizing module completes the voltage stabilizing work of outer power supply, produce various supply voltage, meet the various operating voltage requirements of LFM waveforms generator internal module；Radio-frequency switch circuit, the control bit write by SPI mouth, complete built-in reference and the selection of external reference input signal, after having powered on, acquiescence selects built-in reference；Baseband signal produces circuit 2, according to the control bit of SPI write, produces the intermediate frequency (IF) Linear FM signal of various mid frequency, bandwidth, frequency hopping pulsewidth；Spread spectrum circuit 3, it it is the core of linear frequency modulation microwave signal generator, in order to realize miniature requirement, consider to realize spread spectrum from phase angle, the mode using direct frequency doubling+wave filter is avoided to cause microwave signal generator volume excessive, can also realize in the band to output linearity fm microwave signal, carry the preferable degree of suppression of outer non-harmonic component, owing to spread spectrum output port does not has fixed center frequency, the wave filter of bandwidth limits, convenient realization exports different center frequency, the linear frequency modulation microwave signal of different bandwidth, versatility is stronger, complete the mid frequency to the linear frequency modulation intermediate-freuqncy signal that baseband signal produces, the extension of bandwidth, output has the linear frequency modulation microwave signal of relatively high center frequency and wider bandwidth；Output drive amplification circuit completes the amplification of spread spectrum module output signal, exports the high linearity fm microwave signal of certain power；The harmonic signal of the linear frequency modulation microwave signal that amplifier is exported by harmonic suppression circuit completes suppression.Outside SPI interface circuitry completes controller and outside communication, it is achieved the control to linear frequency modulation microwave signal generator, arranges it and exports various different center frequency, different bandwidth, the linear frequency modulation microwave signal in different frequency modulation cycle.
As in figure 2 it is shown, 62,63,64,67 feet of described FPGA controller 1 connect respectively JTAG download the 1 of mouth U7,5,3,9 feet；1 foot of described FPGA controller 1 connects 2 feet of reset chip ADM812T；6,7,16,17 feet of described FPGA controller 1 respectively connect configuration the 1 of chip EPCS1,2,6,5 feet, configuration chip refer to store FPGA program ROM；The first input end that 68,69,70,71,72,73,74,75 feet of described FPGA controller 1 produce circuit 2 with baseband signal respectively is connected；22,23,24,25 feet of described FPGA controller 1 first input end with spread spectrum circuit 3 respectively is connected；10 feet of described FPGA controller 1 and the output signal interconnection of built-in reference circuit, as the work clock of FPGA controller 1；51,52,53 feet of described FPGA controller 1 respectively with SPI_CLK, SPI_DATA, SPI_SYNC pin interconnection of outside SPI interface circuitry, it is achieved and PERCOM peripheral communication.3.3V and 1.5V after filtering after respectively as the supply voltage of controller.
As it is shown on figure 3, described baseband signal produces circuit 2 uses AD9954 chip, the clock out pin interconnection of its 9 foot and radio-frequency switch circuit, as its reference clock；36,1,48,47,38,39,40,41 feet respectively with FPGA controller 1 68,69,70,71,72,73,74,75 feet interconnection；20,21 feet be connected to the 3 of transformator ADT1-1WT, 1 foot；6 feet of transformator ADT1-1WT export after low pass filter LFCN-80+, as the reference clock of spread spectrum circuit 3.Baseband signal produces 3.3V and 1.8V in circuit 2 and is used for AD9954 chip power supply the most afterwards.
As shown in Figure 4, described spread spectrum circuit 3 uses ADF4159 chip, 22,23,24,25 feet connect the 14 of FPGA controller 1 respectively, 15,16,17 feet；Its 9 foot linker band signal produces the outfan of low pass filter LFCN-80+ in circuit 2.In spread spectrum circuit 3,5V, 3.3V and 1.8V are the most afterwards for the power supply of spread spectrum circuit 3.
Below in conjunction with Fig. 1 to Fig. 4, this utility model is further described.
After having powered on, acquiescence gating built-in reference circuit, as the work clock of controller, gates radio-frequency switch circuit simultaneously, produce the reference clock of circuit 2 as baseband signal, controller completes baseband signal is produced circuit 2 and the initial work of spread spectrum circuit 3 simultaneously.By SPI interface, controller is write control word, controller completes the process to control word, baseband signal is produced circuit 2 and output drive amplification circuit write control data, produce high linearity linear frequency modulation microwave signal, export the high linearity linear frequency modulation microwave signal of certain power through output drive amplification circuit and harmonic suppression circuit.If needing the amendment output mid frequency of high linearity fm microwave signal, bandwidth, the frequency modulation cycle, only need to write control word, final the output mid frequency of Frequency Hopping Signal, bandwidth, hop period can be changed, baseband signal produces the control program of circuit 2 and spread spectrum circuit 3 and has the most been integrated in controller, only by SPI interface, controller need to be write control word.Therefore, use process control convenient, various different center frequency, different modulating bandwidth, the high linearity linear frequency modulation microwave signal of different hop periods can be produced.
It is to say, first, controller realizes that baseband signal produces circuit 2 and spread spectrum circuit 3 realizes controlling；Realize controlling next to that baseband signal is produced circuit 2 by controller, baseband signal produces the various different center frequency of circuit 2, different bandwidth, the intermediate-freuqncy signal in different frequency modulation cycle, exports the reference clock as spread spectrum circuit 3 through transformator and low pass filter.Again, spread spectrum circuit 3 is using the intermediate frequency (IF) Linear FM signal of AD9954 chip output in baseband signal generation circuit 2 as clock during reference, it is achieved to its spread spectrum.
Spread spectrum circuit 3 considers from phase angle, utilizes the narrow-band tracking performance of phaselocked loop, it is achieved the spread spectrum to intermediate frequency linear FM signal.It is compared to the mode using direct frequency doubling+band pass filter circuit to realize spread spectrum, use phaselocked loop to realize spread spectrum circuit output end mouth and need not band filter, volume is relatively small, the mid frequency of output signal and bandwidth are not limited by filter centre frequency and bandwidth, simultaneously the spuious value relative good of output signal.
The linearity for the linear FM signal that spread spectrum circuit 3 finally exports, owing to its linearity of intermediate frequency (IF) Linear FM signal of AD9954 chip output is the highest, after utilizing phaselocked loop that it is carried out spread spectrum, in view of linearity penalty value, the linearity penalty value of phaselocked loop self introducing of frequency multiplication of phase locked loop introducing, the linearity of its final output signal is the highest.
In sum, this utility model can produce the linear frequency modulation microwave signal of high center frequency, broadband, high linearity, compared with prior art, in that context it may be convenient to realize exporting various different center frequency, different bandwidth, the high linearity linear frequency modulation microwave signal in different frequency modulation cycle.Additionally, this utility model has simple in construction, integrated level height, miniaturization, reliability is high, easy to control, output linearity FM signal mid frequency high, the linearity is high, the feature of broader bandwidth, it is adaptable to range finding, speed-measuring radar system.
Claims (5)
- null1. a general small-size high linearity linear frequency modulation microwave signal generator，It is characterized in that: include controller，Its first input end connects outside SPI interface circuitry，The first input end that its first outfan produces circuit (2) with baseband signal is connected，Its second outfan is connected with the first input end of spread spectrum circuit (3)，The first input end of radio-frequency switch circuit receives external reference input signal，The second input that the outfan of radio-frequency switch circuit produces circuit (2) with baseband signal is connected，Baseband signal produces the outfan of circuit (2) and is connected with the second input of spread spectrum circuit (3)，The outfan of spread spectrum circuit (3) is connected with the input of output drive amplification circuit，The outfan of output drive amplification circuit is connected with the input of harmonic suppression circuit，The outfan of harmonic suppression circuit is as the outfan of generator；First outfan of built-in reference circuit is connected with the second input of controller, and the second outfan of built-in reference circuit is connected with the second input of radio-frequency switch circuit；The FPGA controller (1) that described controller uses model to be EP1CT100I7.
- General small-size high linearity linear frequency modulation microwave signal generator the most according to claim 1, it is characterised in that: also include producing, to radio-frequency switch circuit, baseband signal, the DC voltage-stabilizing module that circuit (2), spread spectrum circuit (3), output drive amplification circuit, harmonic suppression circuit, built-in reference circuit and FPGA controller (1) are powered respectively.
- General small-size high linearity linear frequency modulation microwave signal generator the most according to claim 1, it is characterised in that: 62,63,64,67 feet of described FPGA controller (1) connect respectively JTAG download the 1 of mouth U1,5,3,9 feet；1 foot of described FPGA controller (1) connects 2 feet of reset chip ADM812T；6,7,16,17 feet of described FPGA controller (1) respectively connect configuration the 1 of chip EPCS1,2,6,5 feet；The first input end that 68,69,70,71,72,73,74,75 feet of described FPGA controller (1) produce circuit (2) with baseband signal respectively is connected；22,23,24,25 feet of described FPGA controller (1) first input end with spread spectrum circuit (3) respectively is connected；10 feet of described FPGA controller (1) and the output signal interconnection of built-in reference circuit, as the work clock of FPGA controller (1)；51,52,53 feet of described FPGA controller (1) respectively with SPI_CLK, SPI_DATA, SPI_SYNC pin interconnection of outside SPI interface circuitry, it is achieved and PERCOM peripheral communication.
- General small-size high linearity linear frequency modulation microwave signal generator the most according to claim 1, it is characterized in that: described baseband signal produces circuit (2) and uses AD9954 chip, the clock out pin interconnection of its 9 foot and radio-frequency switch circuit, as its reference clock；36,1,48,47,38,39,40,41 feet respectively with FPGA controller (1) 68,69,70,71,72,73,74,75 feet interconnection；20,21 feet be connected to the 3 of transformator ADT1-1WT, 1 foot；6 feet of transformator ADT1-1WT export after low pass filter LFCN-80+, as the reference clock of spread spectrum circuit (3).
- General small-size high linearity linear frequency modulation microwave signal generator the most according to claim 4, it is characterized in that: described spread spectrum circuit (3) uses ADF4159 chip, and 22,23,24,25 feet connect 14,15,16,17 feet of FPGA controller (1) respectively；Its 9 foot linker band signal produces the outfan of low pass filter LFCN-80+ in circuit (2).
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| CN105846837A (en) * | 2016-05-17 | 2016-08-10 | 合肥星波通信股份有限公司 | Universal miniaturized high linearity linear frequency modulation microwave signal generator |
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| CN105846837A (en) * | 2016-05-17 | 2016-08-10 | 合肥星波通信股份有限公司 | Universal miniaturized high linearity linear frequency modulation microwave signal generator |
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