CN207518570U - A kind of wide-band microwave frequency hopping synthesizer - Google Patents

Abstract

The utility model discloses a kind of wide-band microwave frequency hopping synthesizer, including crystal oscillator, DDS, first filter, PLL, control unit, second filter, first, second, third frequency multiplication filter circuit and RF switch；The first end of DDS is connected with crystal oscillator, and second end is connected with the first end of control unit；The first end of first filter is connected with the third end of DDS；The first end of PLL is connected with the second end of first filter, and second end is connected with the second end of control unit；Control unit has the interface for receives frequency control word information, and the third end of control unit is connected with RF switch；The first end of second filter is connected with the second end of PLL；One Fen Wei of second end, tetra- tunnels of second filter, respectively one end with first, second, third frequency multiplication filter circuit, RF switch be connected；The other end of first, second, third frequency multiplication filter circuit is connected respectively with RF switch；Small stepping fast frequency hopping is realized, has the characteristics that miniaturization, phase noise is low, wide frequency range.

Description

A kind of wide-band microwave frequency hopping synthesizer

Technical field

The utility model belongs to the broadband frequency-hopping synthesizer technical field in microwave communication, electronic device field, tool Body is related to a kind of wide-band microwave frequency hopping synthesizer.

Background technology

With communication, the development of radar, electronic countermeasure field, the phase noise, spuious and frequency conversion to frequency synthesizer are fast Degree and band width propose higher requirement.In modern war, electronic reconnaissance and electronic countermeasure are increasingly by people Great attention, to improve intercept probability, and the information such as carrier frequency, impulse modulation to intercepted signal are analyzed, and are replicated, and then Effectively interfered, ultra wide band, fast frequency-hopped, high-resolution, high clutter recognition and low phase noise frequency synthesizer be Electronic reconnaissance and electronic warfare system are desired.Broadband frequency hopping source common at present mainly continues to use traditional design cannot be simultaneously Meet fast frequency-hopped, small stepping and miniaturization, the requirement of low-power consumption.

Utility model content

For the disadvantages described above or Improvement requirement of the prior art, the utility model provides a kind of wide-band microwave frequency hopping synthesizer, Its object is to realize that frequency range covers by the way of being segmented frequency multiplication using DDS+PLL+, thus solving the prior art cannot meet simultaneously Fast frequency-hopped, small stepping and miniaturization, low-power consumption demand the technical issues of.

To achieve the above object, according to the one side of the utility model, a kind of wide-band microwave frequency hopping synthesizer is provided, including Crystal oscillator, Direct Digital Synthesizer (Direct Digital Synthesizer, DDS) unit, first filter, lock phase Ring element (PLL), control unit, second filter, the first frequency multiplication filter circuit, the second frequency multiplication filter circuit, the filter of third frequency multiplication Wave circuit and RF switch；

Wherein, the first end of DDS is connected with crystal oscillator, and second end is connected with the first end of control unit；First filter First end is connected with the third end of DDS；The first end of PLL is connected with the second end of first filter, second end and control unit Second end be connected；The third end of control unit is connected with RF switch；The first end of second filter and the second end phase of PLL Even；One Fen Wei of second end, tetra- tunnels of second filter, respectively with the first frequency multiplication filter circuit, the second frequency multiplication filter circuit, third Frequency multiplication filter circuit, RF switch one end be connected；First frequency multiplication filter circuit, the second frequency multiplication filter circuit, the filter of third frequency multiplication The other end of wave circuit is connected respectively with RF switch；Control unit has the frequency control word for receiving external system transmission The interface of information；

Preferably, above-mentioned wide-band microwave frequency hopping synthesizer, the first frequency multiplication filter circuit, the second frequency multiplication filter circuit composition phase Together, the first frequency multiplier, third wave filter, the second frequency multiplier and the 4th wave filter including being sequentially connected；First frequency multiplication filtered electrical Road, third wave filter in the second frequency multiplication filter circuit output terminal be connected with RF switch；Third frequency multiplication filter circuit packet Include the first frequency multiplier being sequentially connected, third wave filter.

Preferably, above-mentioned wide-band microwave frequency hopping synthesizer, control unit realize that DDS uses AD9914 using FPGA；Phaselocked loop Using ADF4153；Third wave filter in frequency multiplication filter circuit is Microstrip Low-Pass, and the 4th wave filter uses bandpass filtering Device, Microstrip Low-Pass are realized that bandpass filter uses parallel coupling wave filter by high low-impedance line.

Crystal oscillator provides reference clock, the frequency that control unit reception is sent by system as external reference a reference source for DDS After control word information, the required control information of DDS work is converted by internal processes operation, DDS receives control information Working condition is latched by internal circuit afterwards, and in the state of being operated in required for system；When DDS receives the control of new frequency During information, working condition exports corresponding frequency signal with being changed, and realizes fast frequency-hopped.

Preferably, above-mentioned wide-band microwave frequency hopping synthesizer, first filter use low-pass filter；Low-pass filter is used to drop The spurious signal of low DDS output frequency signals reduces image disturbing signal, improves signal transmission performance, enhances transmission reliability；

PLL is sent to after the fast frequency-hopped signal filtering of small stepping that first filter exports DDS, as the defeated of phaselocked loop Enter reference frequency；The fast frequency-hopped signal of small stepping is carried out frequency synthesis by phaselocked loop, is phase-locked to radio frequency S frequency ranges, realizes that frequency spectrum is removed It moves, enhances each interport isolation.

Preferably, above-mentioned wide-band microwave frequency hopping synthesizer, second filter use bandpass filter, for filtering out PLL outputs Spurious signal in signal in addition to main signal obtains the output signal of high spurious reduction.

Filtered signal is input to frequency multiplication filtering link, point three tunnels are amplified frequency multiplication filtering, generate six tunnels respectively Signal, then frequency-selecting output is carried out by FPGA control RF switches.Frequency multiplier is by the radiofrequency signal frequency multiplication of input, frequency multiplier front stage Wave filter for bandpass filter, mainly filter out fundamental wave and triple-frequency harmonics；By filtered signal, it is input to the defeated of switch Inbound port；By the way that RF switch is controlled to carry out frequency-selecting output.

Preferably, above-mentioned wide-band microwave frequency hopping synthesizer, the third wave filter in frequency multiplication filter circuit use micro-strip low pass filtered Wave device, the 4th wave filter use bandpass filter.

In general, it can obtain down the above technical solutions conceived by the present invention are compared with the prior art, Row advantageous effect：

Wide-band microwave FM source provided by the utility model realizes that small stepping exports, with reference to phaselocked loop using small stepping DDS Circuit realizes that frequency synthesizer is fast frequency-hopped；It is realized and spread by the multichannel frequency multiplication filter circuit of segmentation again, and by RF switch Frequency-selecting output is controlled, realizes Broadband emission；Whole system is controlled by control system, simplifies the complexity of hardware design Degree；And use small, high integration phase-locked loop circuit, realize miniaturization and it is integrated；It is small, quick with output stepping Frequency hopping, phase noise be low, it is spuious it is low, harmonic wave is low, wide frequency range, integration degree are high, low in energy consumption, simple in structure, performance is steady It is fixed, flexibly and fast, strong applicability the characteristics of.

Description of the drawings

Fig. 1 is the system schematic of one embodiment of wide-band microwave frequency hopping synthesizer provided by the utility model.

Specific embodiment

In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to explain The utility model is not used to limit the utility model.In addition, institute in the various embodiments of the present invention described below The technical characteristic being related to can be combined with each other as long as they do not conflict with each other.

With reference to shown in Fig. 1, it is the system schematic of one embodiment of wide-band microwave frequency hopping synthesizer provided in this embodiment, wraps Include crystal oscillator, DDS, first filter, phase locked-loop unit (PLL), control unit, second filter, the first frequency multiplication filter circuit, Two frequency multiplication filter circuits, third frequency multiplication filter circuit and RF switch；

Wherein, the first end of DDS is connected with crystal oscillator, and second end is connected with the first end of control unit；First filter First end is connected with the third end of DDS；The first end of PLL is connected with the second end of first filter, second end and control unit Second end be connected；The third end of control unit is connected with RF switch；The first end of second filter and the second end phase of PLL Even；One Fen Wei of second end, tetra- tunnels of second filter, respectively with the first frequency multiplication filter circuit, the second frequency multiplication filter circuit, third Frequency multiplication filter circuit, RF switch one end be connected；First frequency multiplication filter circuit, the second frequency multiplication filter circuit, the filter of third frequency multiplication The other end of wave circuit is connected respectively with RF switch；

First frequency multiplication filter circuit, the composition of the second frequency multiplication filter circuit are identical, including be sequentially connected the first frequency multiplier, Third wave filter, the second frequency multiplier and the 4th wave filter；Third filter in first frequency multiplication filter circuit, the second frequency multiplication filter circuit The output terminal of wave device is connected with RF switch；Third frequency multiplication filter circuit includes the first frequency multiplier being sequentially connected, third filter Wave device.

In the present embodiment, control unit is realized using FPGA, and DDS uses AD9914；Phaselocked loop uses ADF4153；Frequency multiplication Third wave filter in filter circuit is Microstrip Low-Pass, and the 4th wave filter uses bandpass filter, micro-strip low-pass filtering Device is realized that bandpass filter uses the form of parallel coupling wave filter, using ADS softwares emulate excellent by high low-impedance line Change.

The signal input part of DDS receives externally input reference clock signal, and the frequency of the reference clock signal is The output frequency range of 120MHz, DDS include three frequency ranges, corresponding PLL output frequency range be respectively 2GHz~2.5GHz, 2.5GHz~ 3GHz, 3GHz~4GHz, output is to by the filtering of first, second, third frequency multiplication after PLL output signal is filtered by second filter The frequency multiplication filtering link that circuit is formed；Three frequency ranges point, three tunnels pass through first, second, third frequency multiplication filter circuit respectively Frequency multiplication filtering is amplified, generates six road signals, covers 2GHz~12GHz frequency bands, then RF switch is controlled by control unit SP6T carries out frequency-selecting output；In each frequency multiplication filter circuit, frequency multiplier filters the radiofrequency signal frequency multiplication of input, third, the 4th Device is mainly used for filtering out fundamental wave and triple-frequency harmonics；By filtered signal, the input port of RF switch is input to, passes through control RF switch processed carries out frequency-selecting output；Control unit is used to control the frequency control word of DDS, the frequency dividing ratio N of PLL and radio frequency Switch the on or off of SP6T.

This wide-band microwave frequency hopping synthesizer that embodiment provides realizes low side using the mixed frequency synthetic schemes of DDS+PLL The output of frequency, then realize spread spectrum by being segmented frequency multiplication filter circuit, and by RF switch control frequency-selecting output, whole system is led to Cross control unit control, have output stepping it is small, fast frequency-hopped, phase noise is low, it is spuious it is low, harmonic wave is low, wide frequency range, collection Into the characteristics of degree is high, low in energy consumption, simple in structure, performance is stablized is changed, different environment is can apply to, there is very strong practicability.

As it will be easily appreciated by one skilled in the art that the above is only the preferred embodiment of the utility model only, not To limit the utility model, any modification made within the spirit and principles of the present invention, equivalent replacement and change Into etc., it should be included within the scope of protection of this utility model.

Claims (6)

1. a kind of wide-band microwave frequency hopping synthesizer, which is characterized in that including crystal oscillator, DDS, first filter, PLL, control unit, second Wave filter, the first frequency multiplication filter circuit, the second frequency multiplication filter circuit, third frequency multiplication filter circuit and RF switch；

The first end of the DDS is connected with crystal oscillator, and second end is connected with the first end of control unit；The first end of first filter It is connected with the third end of DDS；The first end of the PLL is connected with the second end of first filter, second end and control unit Second end is connected；The third end of described control unit is connected with RF switch；The first end of the second filter and the of PLL Two ends are connected；One Fen Wei of second end, tetra- tunnels of the second filter filter respectively with the first frequency multiplication filter circuit, the second frequency multiplication Circuit, third frequency multiplication filter circuit, RF switch one end be connected；The first frequency multiplication filter circuit, the second frequency multiplication filtered electrical Road, third frequency multiplication filter circuit the other end be connected respectively with RF switch；Described control unit has to receive external system The interface for the frequency control word information sent of uniting.

2. wide-band microwave frequency hopping synthesizer as described in claim 1, which is characterized in that the first frequency multiplication filter circuit, second times The composition of frequency filter circuit is identical, including the first frequency multiplier, third wave filter, the second frequency multiplier and the 4th filtering being sequentially connected Device；The first frequency multiplication filter circuit, third wave filter in the second frequency multiplication filter circuit output terminal with RF switch phase Even；The third frequency multiplication filter circuit includes the first frequency multiplier being sequentially connected and third wave filter.

3. wide-band microwave frequency hopping synthesizer as claimed in claim 1 or 2, which is characterized in that described control unit using FPGA realize, The DDS uses AD9914；The PLL uses ADF4153.

4. wide-band microwave frequency hopping synthesizer as claimed in claim 1 or 2, which is characterized in that the first filter uses low pass filtered Wave device, for reducing the spurious signal and image disturbing signal of DDS output frequency signals.

5. wide-band microwave frequency hopping synthesizer as claimed in claim 1 or 2, which is characterized in that second filter uses bandpass filter, The output signal of high spurious reduction is obtained for filtering out the spurious signal in PLL output signal in addition to main signal.

6. wide-band microwave frequency hopping synthesizer as claimed in claim 2, which is characterized in that the third wave filter uses micro-strip low pass filtered Wave device, the 4th wave filter use bandpass filter；Microstrip Low-Pass realizes that bandpass filter is used using high low-impedance line Parallel coupling wave filter is realized.