CN203104410U - K wave band frequency modulation continuous wave signal generation circuit - Google Patents

K wave band frequency modulation continuous wave signal generation circuit Download PDF

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Publication number
CN203104410U
CN203104410U CN 201320039774 CN201320039774U CN203104410U CN 203104410 U CN203104410 U CN 203104410U CN 201320039774 CN201320039774 CN 201320039774 CN 201320039774 U CN201320039774 U CN 201320039774U CN 203104410 U CN203104410 U CN 203104410U
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frequency
circuit
continuous wave
band
frequency modulation
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CN 201320039774
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张冬
姜黎
顾晶
高志军
茅文深
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Nanjing LES Information Technology Co. Ltd
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Nanjing LES Information Technology Co. Ltd
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Abstract

The utility model discloses a K wave band frequency modulation continuous wave signal generation circuit. A frequency modulation continuous signal is synthesized at a relatively low frequency position by using the technology of combining a direct digital frequency synthesizer and a phase-locked loop, and a K wave band frequency modulation continuous wave signal with a frequency range being 24GHz to 24.245GHz is obtained through twice frequency multiplications. The K wave band frequency modulation continuous wave signal generation circuit is flexible in frequency adjustment, simple in circuit structure and relatively high in frequency sweep linearity.

Description

A kind of K wave band Continuous Wave with frequency modulation signal generating circuit
Technical field
The utility model relates to technical fields such as digital circuit, microwave circuit, radio circuit, especially a kind of K wave band Continuous Wave with frequency modulation signal generating circuit.
Background technology
Terminological interpretation:
Continuous Wave with frequency modulation (FMCW): frequency increases progressively or linear decrease or both have both at the same time in a band frequency scope internal linear, and is the signal that periodic law changes.
Voltage controlled oscillator (VCO): the nonlinear characteristic of utilizing triode, field effect transistor or gunn pipe, by bias voltage that changes circuit or the methods such as control voltage that change varactor in the circuit, make circuit generation resonance, export the circuit or the integrated chip of required frequency signal.
Because microwave transmission is subjected to Effect of Environmental such as weather, illumination hardly, adopt the small solid radar of FMCW technology to obtain using widely.In fmcw radar, radiating circuit is launched the Continuous Wave with frequency modulation signal of linear change, transmits to run into target and promptly be reflected.Because the hysteresis of echo-signal frequency, make to transmit and echo-signal produces frequency difference between the two that this frequency difference changes with the survey target range, utilizes this frequency difference can determine target range.The working frequency range of common fmcw radar has X-band, K wave band, E wave band etc., and the generation of Continuous Wave with frequency modulation signal is one of key technology of this radar.There is confidential relation in the linearity of the range accuracy of fmcw radar and range resolution ratio and Continuous Wave with frequency modulation signal.。
The production method of existing K wave band Continuous Wave with frequency modulation signal is to control voltage controlled oscillator (VCO) linear frequency sweep by the analog voltage signal (as triangular signal) that produces the continuous linear change of one-period, thereby produces the Continuous Wave with frequency modulation signal.
Because it is bigger non-linear that the nonlinear characteristic of VCO causes the swept-frequency signal of VCO output to have, this will have a strong impact on range accuracy.Therefore, must take various measures to improve the linearity of VCO output signal.Existing linearity correction method mainly contains two kinds: 1, precorrection method, promptly survey and draw out in advance modulation voltage/output frequency curve of VCO, proofread and correct according to this curve then, owing to the non-linear of VCO changes with variation of temperature, so this bearing calibration is subjected to Temperature Influence bigger.2, closed-loop corrected method promptly adopts delay line to carry out certain delay transmitting, and carries out mixing as echo-signal with transmitting, and by measuring the Beat Signal of mixing gained, adjusts the output frequency of VCO, and correction accuracy can only reach 0.1%.。
So, need a kind of new technical scheme to address the above problem.
The utility model content
The purpose of this utility model is the shortcoming that overcomes prior art, provides a kind of frequency adjustment flexible, and circuit structure is simple, the K wave band Continuous Wave with frequency modulation signal generating circuit that the sweep linearity degree is higher.
For achieving the above object, the utility model K wave band Continuous Wave with frequency modulation signal generating circuit can adopt following technical scheme:
A kind of K wave band Continuous Wave with frequency modulation signal generating circuit comprises power circuit, digital control interface, low frequency frequency synthesizer circuit, Ku audio range frequency translation circuit, the K-band frequency translation circuit of being responsible for power supply; The synthetic low frequency Continuous Wave with frequency modulation signal of digital control interface output digital controlled signal control low frequency frequency synthesizer circuit; The output of low frequency frequency synthesizer circuit is connected to the input of Ku audio range frequency translation circuit; The output of Ku audio range frequency translation circuit is divided into three the tunnel: wherein two-way is directly exported Ku wave band Continuous Wave with frequency modulation signal, and another road is connected to the input of K-band frequency translation circuit; K-band frequency translation circuit output K wave band Continuous Wave with frequency modulation signal; The low frequency frequency synthesizer circuit comprises crystal oscillator, DDS chip, PLL chip, frequency mixer, band pass filter, radio freqnency transformer.
Compare with background technology, the technology that the utility model K wave band Continuous Wave with frequency modulation signal generating circuit adopts Direct Digital Frequency Synthesizers to combine with phase-locked loop is synthesized the Continuous Wave with frequency modulation signal in stability at lower frequencies, obtain the K wave band Continuous Wave with frequency modulation signal that frequency range is 24GHz~24.245GHz through twice frequency multiplication again, the frequency adjustment is flexible, circuit structure is simple, and the sweep linearity degree is higher.
Preferably, Ku audio range frequency translation circuit comprises 16 frequency multipliers, first filter, first dual-stage amplifier, merit parallel circuit.
Preferably, the K-band frequency translation circuit comprises second filter and second dual-stage amplifier.
Description of drawings
Fig. 1 is the annexation figure of the utility model K wave band Continuous Wave with frequency modulation signal generating circuit.
Fig. 2 is the annexation figure of the utility model medium and low frequency frequency synthesizer circuit.
Fig. 3 is the annexation figure of Ku audio range frequency translation circuit in the utility model.
Fig. 4 is the annexation figure of K-band frequency translation circuit in the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, should understand these embodiment only be used to the utility model is described and be not used in the restriction scope of the present utility model, after having read the utility model, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present utility model.
See also shown in Figure 1ly, the utility model discloses a kind of K wave band Continuous Wave with frequency modulation signal generating circuit, comprises power circuit, digital control interface, low frequency frequency synthesizer circuit, Ku audio range frequency translation circuit, the K-band frequency translation circuit of being responsible for power supply; The synthetic low frequency Continuous Wave with frequency modulation signal of digital control interface output digital controlled signal control low frequency frequency synthesizer circuit; The output of low frequency frequency synthesizer circuit is connected to the input of Ku audio range frequency translation circuit; The output of Ku audio range frequency translation circuit is divided into three the tunnel: wherein two-way is directly exported Ku wave band Continuous Wave with frequency modulation signal, and another road is connected to the input of K-band frequency translation circuit; K-band frequency translation circuit output K wave band Continuous Wave with frequency modulation signal.
The operating frequency of phase-locked loop (PLL) is higher, frequency stability is high, but frequency resolution is lower, and change-over time is longer; And Direct Digital Frequency Synthesizers (DDS) has high resolution and extremely short frequency inverted time, but output frequency is not high.The utility model than the synthetic Continuous Wave with frequency modulation of low-frequency range, obtains the Continuous Wave with frequency modulation signal of Ku wave band and K wave band in conjunction with the advantage of PLL and DDS respectively again through double conversion.
Power circuit mainly utilizes the linear voltage regulator chip to finish input power supply+6.4V, and+3.3V arrives+5V ,+3.3V, and+2.1V, the change action of+1.8V is other each partly power supplies.
Digital control interface produces digital controlled signal CS and I/O UPDATE, clock signal SCLK write DDS chip internal relevant register with control word SDIO signal, thereby sets the operating state of DDS; Produce the switching of frequency sweep control signal PS0 control DDS chip frequency sweep direction.Simultaneously, digital control circuit also produces control signal SENB, clock signal SCLK control word SDIO signal is write PLL chip internal relevant register, thereby sets the operating state of PLL.The chip model that digital control interface adopts is EP1C12Q240C8N.
See also shown in Figure 2, the low frequency frequency synthesizer circuit mainly comprises crystal oscillator HXO-36B, DDS chip AD9954, PLL chip Si4112, frequency mixer AD8343, band pass filter BPF_750MHz, radio freqnency transformer ETC1-1-13, and its circuit connecting relation as shown in Figure 2.HXO36B exports the reference clock signal of 20MHz, is connected to the 9th pin OCS/REFCLOCK and Si4112 the 15th pin XIN of AD9954 respectively by capacitor C 25, C46.The FM signal of AD9954 output difference under control signal CS, SCLK, I/O UPDATE, PS0, the SDIO of digital control circuit control.The frequency range of this signal is 80MHz~87.65625MHz, and frequency step is 300.245Hz.The reference signal of AD9954 is 20MHz, by enabling inner frequency multiplier, can so that system clock up to 400MHz, synchronised clock is 1/4 of a system clock, i.e. 100MHz, the frequency hopping time of AD9954 reaches 10ns.AD9954 has 32 bit frequency control words, and its frequency resolution is 400MHz/232, i.e. 0.1Hz.When AD9954 output signal during at 80MHz~87.65625MHz, the phase noise of signal reaches-120dBc@100kHz.The arrowband Spurious Free Dynamic Range is greater than 80dB.Si4112 is under control signal SENB, SCLK, the SDIO of digital control circuit control, and producing frequency is the simple signal of 670MHz.In order to stablize output signal frequency, between intermediate frequency tuned port IFLA and IFLB, be connected an inductance L 7.Be the signal power maximum that makes that load obtains, need export coupling in inductance L 6 of 23 pins series connection.Realize AC coupled by being connected in series a capacitor C 58 between medium frequency output end IFOUT and its load, and constitute output matching network, to reduce harmonic distortion with L6.The 670MHz signal phase noise of Si4112 output reaches-117dBc@100kHz, harmonic wave inhibition degree-20~-26dBc.The output signal of Si4112 is converted to differential signal through radio freqnency transformer T1, through capacitor C 60, C61 is connected to local oscillator input LOIM, the LOIP of frequency mixer AD8343, and the output differential signal of AD9954 is connected to signal input part INPM, the INPP of AD8343, carries out mixing by AD8343.Output OUTM, the OUTP of AD8343 is connected respectively to 3,4 pins of radio freqnency transformer T2, export by 1 pin of radio freqnency transformer T2 after being converted to single-ended signal, be connected to band pass filter BPF_705MHz filtering input through capacitor C 65 again, it is 750MHz~757.65625MHz low frequency Continuous Wave with frequency modulation signal that the BPF_705MHz output obtains frequency.
See also shown in Figure 3ly, Ku audio range frequency translation circuit is made of 16 frequency multiplier HMC445, filter BPF_12GHz, dual-stage amplifier NE3512S02, merit parallel circuit PWR_DIVIDER.The output signal of low frequency frequency synthesizer circuit is connected to the input of HMC445, finishes 16 frequencys multiplication.The output of HMC445 is connected to the BPF_12GHz input.BPF_12GHz is 7 grades of Chebyshev's strip line band pass filters, and filtering obtains the Continuous Wave with frequency modulation signal that frequency range is 12GHz~12.1225GHz.The output of BPF_12GHz connects two-stage NE3512S02 in turn, input signal is amplified 20dB after, be connected to the input of PWR_DIVIDER.PWR_DIVIDER is not five equilibrium power three tunnel output power splitters of strip line, directly as two-way Ku wave band Continuous Wave with frequency modulation signal output of the present utility model, Third Road output is connected to the input of K-band frequency translation circuit for the output of its first via, the second tunnel output.Because this partial circuit has carried out 16 frequencys multiplication to input signal, so the three-way output signal frequency accuracy reaches 1.6Hz, frequency step reaches 4804Hz.
See also shown in Figure 4ly, the K-band frequency translation circuit has NE3512S02, BPF_24GHz to constitute.Annexation as shown in Figure 4.The output of the Third Road of Ku audio range frequency translation circuit is connected to the input of NE3512S02, NE3512S02 input signal 2 frequencys multiplication after, be connected to the input of BPF_24GHz.BPF_24GHz is 5 grades of Chebyshev's strip line band pass filters, and filtering obtains the K wave band Continuous Wave with frequency modulation signal output that frequency range is 24GHz~24.245GHz.Because this partial circuit has carried out 2 frequencys multiplication to input signal, so the output signal frequency precision reaches 3.2Hz, frequency step reaches 9608Hz, calculates the frequency linearity degree and reaches 0.033%.The phase noise of signal reaches-102dBc@100kHz.
The beneficial effects of the utility model have: the technology that adopts DDS to combine with PLL, improved the linearity of Continuous Wave with frequency modulation signal; Digital technology, good product consistency, temperature drift is low; Change swept frequency range by digital programmable, wide frequency range is provided with flexibly; Filter all adopts strip line filter, and circuit structure is simpler, and surface mounting component reduces, and production cost is lower.
Wherein, the low frequency frequency synthesizer circuit can be selected the chips such as DDS, PLL of other model, realizes same function; Low frequency bandpass filter BPF_750MHz can adopt lumped filter, realizes same filter function, does not repeat them here.

Claims (3)

1. a K wave band Continuous Wave with frequency modulation signal generating circuit is characterized in that: comprise power circuit, digital control interface, low frequency frequency synthesizer circuit, Ku audio range frequency translation circuit, the K-band frequency translation circuit of being responsible for power supply; The synthetic low frequency Continuous Wave with frequency modulation signal of digital control interface output digital controlled signal control low frequency frequency synthesizer circuit; The output of low frequency frequency synthesizer circuit is connected to the input of Ku audio range frequency translation circuit; The output of Ku audio range frequency translation circuit is divided into three the tunnel: wherein two-way is directly exported Ku wave band Continuous Wave with frequency modulation signal, and another road is connected to the input of K-band frequency translation circuit; K-band frequency translation circuit output K wave band Continuous Wave with frequency modulation signal; The low frequency frequency synthesizer circuit comprises crystal oscillator, DDS chip, PLL chip, frequency mixer, band pass filter, radio freqnency transformer.
2. K wave band Continuous Wave with frequency modulation signal generating circuit according to claim 1, it is characterized in that: Ku audio range frequency translation circuit comprises 16 frequency multipliers, first filter, first dual-stage amplifier, merit parallel circuit.
3. K wave band Continuous Wave with frequency modulation signal generating circuit according to claim 2, it is characterized in that: the K-band frequency translation circuit comprises second filter and second dual-stage amplifier.
CN 201320039774 2013-01-24 2013-01-24 K wave band frequency modulation continuous wave signal generation circuit Expired - Lifetime CN203104410U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104237855A (en) * 2014-09-23 2014-12-24 中国科学院电子学研究所 Ku wave band linear frequency modulation continuous wave radar transmitter based on non-linear compensation function
CN108169720A (en) * 2018-02-08 2018-06-15 上海广电通信技术有限公司 X-band low phase noise navigation frequency modulated continuous wave radar emission system
CN108494398A (en) * 2018-03-30 2018-09-04 广东圣大电子有限公司 A kind of design method and source of X-band ultralow phase noise frequency source
CN111025407A (en) * 2019-12-26 2020-04-17 北京遥测技术研究所 Non-sensing high-flux millimeter wave radar security inspection device and method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104237855A (en) * 2014-09-23 2014-12-24 中国科学院电子学研究所 Ku wave band linear frequency modulation continuous wave radar transmitter based on non-linear compensation function
CN104237855B (en) * 2014-09-23 2016-06-01 中国科学院电子学研究所 There is the Ku wave band linear frequency modulation continuous wave radar transmitter of non-linear compensate function
CN108169720A (en) * 2018-02-08 2018-06-15 上海广电通信技术有限公司 X-band low phase noise navigation frequency modulated continuous wave radar emission system
CN108169720B (en) * 2018-02-08 2024-01-05 上海广电通信技术有限公司 X-band low-phase noise navigation frequency modulation continuous wave radar transmitting system
CN108494398A (en) * 2018-03-30 2018-09-04 广东圣大电子有限公司 A kind of design method and source of X-band ultralow phase noise frequency source
CN111025407A (en) * 2019-12-26 2020-04-17 北京遥测技术研究所 Non-sensing high-flux millimeter wave radar security inspection device and method
CN111025407B (en) * 2019-12-26 2022-03-04 北京遥测技术研究所 Non-sensing high-flux millimeter wave radar security inspection device and method

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