CN205844515U

CN205844515U - Ultra wide-band linear frequency modulated signals based on PLL produces circuit and radio communication device

Info

Publication number: CN205844515U
Application number: CN201620808274.8U
Authority: CN
Inventors: 颜广; 崔洪亮; 常天英; 赵兴文; 田现忠; 葛兆斌; 张琳; 杨秀蔚
Original assignee: Institute of Automation Shandong Academy of Sciences
Current assignee: Institute of Automation Shandong Academy of Sciences
Priority date: 2016-07-28
Filing date: 2016-07-28
Publication date: 2016-12-28
Anticipated expiration: 2026-07-28

Abstract

The utility model discloses a kind of ultra wide-band linear frequency modulated signals based on PLL and produce circuit and radio communication device, ultra wide-band linear frequency modulated signals produces circuit and includes phase-locked loop chip, phase-locked loop chip is connected with the outfan of temperature compensating crystal oscillator, and temperature compensating crystal oscillator is for providing shake fixed reference clock for phase-locked loop chip；The outfan of phase-locked loop chip is connected with the input of loop filter, and the outfan of described loop filter is connected with the input of voltage controlled oscillator；The outfan of voltage controlled oscillator is connected with power distributing circuit；Power distributing circuit output two-way merit sub-signal, a road is connected with amplifying circuit, and another road feeds back to the radio-frequency (RF) signal input end of phase-locked loop chip；The outfan of amplifying circuit is connected with the input of band filter, the outfan output linearity FM signal of band filter.This utility model is ensureing that the linear FM signal linearity, with under behavior pattern, effectively reduces system complexity and cost.

Description

Ultra wide-band linear frequency modulated signals based on PLL produces circuit and radio communication device

Technical field

This utility model belongs to radar wideband frequency source domain, particularly relates to a kind of UWB-LFM based on PLL Signal generating circuit and radio communication device.

Background technology

The ultra-broadband signal that ultra-broadband wall-through radar utilizes transmitter to produce obtains a highest distance of positions High Resolution, receives Machine is by after the echo demodulation of target reflection after body of wall, and signal processing passes through relevant Processing Algorithm to the target after body of wall Carry out detecting, positioning even imaging.

System linear frequency modulation (LFM) signal of through-wall radar employing at present, impulse (Impulse) signal, frequency Stepping (SF) signal etc..Ultra wide-band linear frequency modulated signals has big instant bandwidth, has High Range Resolution and high moving target The detection advantage such as characteristic, therefore be the widely used a kind of signal form of the system such as pulse compression radar, synthetic aperture radar.

The most direct production method of linear FM signal is DDS, and it has the feature of high linearity, but working frequency range is relatively Low, typically rarely exceed GHz.Voltage controlled oscillator VCO can produce the swept-frequency signal with relative broad range, but the linear frequency modulation produced Linearly degree is retrained by the low linearity of VCO self, needs complicated gamma correction system.The excellent of DDS Yu VCO lacks at present Point well can be combined by phase-locked loop, and output signal both ensure that the high linearity of DDS, has been simultaneously achieved VCO's Wide scope frequency sweep.But circuit structure is complicated, spurious reduction is poor.

Utility model content

In order to solve the shortcoming of prior art, this utility model provides a kind of ultra wide-band linear frequency modulated signals based on PLL Produce circuit and radio communication device.This utility model can control VCO by phase-locked loop circuit in the case of not using DDS Directly export the linear FM signal of high linearity, low spurious, effectively reduce system design complexity and cost.

For achieving the above object, this utility model is by the following technical solutions:

A kind of ultra wide-band linear frequency modulated signals based on PLL produces circuit, including phase-locked loop chip, described phase-locked loop chip Being connected with the outfan of temperature compensating crystal oscillator, described temperature compensating crystal oscillator is for providing shake fixed reference clock for phase-locked loop chip；

The outfan of described phase-locked loop chip is connected with the input of loop filter, the outfan of described loop filter It is connected with the input of voltage controlled oscillator；The outfan of described voltage controlled oscillator is connected with power distributing circuit；Described power divides Distribution road output two-way merit sub-signal, a road is connected with amplifying circuit, and the radiofrequency signal that another road feeds back to phase-locked loop chip is defeated Enter end；

The outfan of described amplifying circuit is connected with the input of band filter, the outfan output lead of band filter Property FM signal.

Described loop filter uses active proportional-integral filter, and device is used for improving the interference free performance of whole circuit.

Described band filter is S-band band filter.Add band filter, filter high-frequency harmonic, complete super The out-of-band harmonics suppression of wideband voltage controlled oscillator output signal.

Described amplifying circuit includes amplification chip, and the outfan of described amplification chip passes through an inductance element and power supply phase Even, inductance element is also connected with three electric capacity being connected in parallel with at the point of contact of power supply.

A kind of radio communication device, produces circuit including described ultra wide-band linear frequency modulated signals based on PLL.

The beneficial effects of the utility model are:

This utility model can control voltage controlled oscillator by phase-locked loop circuit and directly export in the case of not using DDS High linearity, the linear FM signal of low spurious, effectively reduce system design complexity and cost.Ensureing linear FM signal The linearity, with under behavior pattern, effectively reduces system complexity and cost.

Accompanying drawing explanation

Fig. 1 is that ultra wide-band linear frequency modulated signals based on PLL of the present utility model produces circuit diagram；

Fig. 2 is the circuit diagram that phase-locked loop chip of the present utility model is connected with temperature compensating crystal oscillator；

Fig. 3 is loop filter circuit figure of the present utility model；

Fig. 4 is voltage-controlled oscillator circuit figure of the present utility model；

Fig. 5 is the combinational circuit diagram of power distributing circuit of the present utility model, low-noise amplification circuit and band filter.

Detailed description of the invention

Below in conjunction with the accompanying drawings preferred embodiment of the present utility model is described in detail, so that advantage of the present utility model Can be easier to be readily appreciated by one skilled in the art with feature, thus protection domain of the present utility model is made apparent clearly Define.

Fig. 1 is that ultra wide-band linear frequency modulated signals based on PLL of the present utility model produces circuit diagram, as it can be seen, based on The ultra wide-band linear frequency modulated signals of PLL produces circuit and includes the output of phase-locked loop chip, described phase-locked loop chip and temperature compensating crystal oscillator End is connected, and described temperature compensating crystal oscillator is for providing shake fixed reference clock for phase-locked loop chip；

In the present embodiment, as in figure 2 it is shown, phase-locked loop chip uses HMC703LP4E.

As it is shown on figure 3, loop filter uses active proportional-integral filter, OP184ES is used to be achieved.

As shown in Figure 4, voltage controlled oscillator uses the V600ME14-LF voltage controlled oscillator of Z-Communications company to give To realize.

As it is shown in figure 5, band filter is S-band band filter, LFCN-3800 is used to be achieved.

Amplifying circuit includes amplification chip, and the outfan of described amplification chip is connected with power supply by an inductance element, electricity Sensing unit is also connected with three electric capacity being connected in parallel with at the point of contact of power supply.Wherein, amplification chip uses low noise amplification Chip.Low noise amplification chip in the present embodiment uses ADL5601.

Ultra wide-band linear frequency modulated signals based on PLL of the present utility model produces circuit and is divided into three parts:

(1) swept signal source part: this part utilizes possesses the HMC703 phase-locked loop chip of frequency sweep function, outside V600ME14 voltage controlled oscillator and loop filter collectively constitute phase-locked loop circuit.2 can be realized by configuring HMC703 depositor ～4GHz linear frequency sweep.The radio frequency reference signal that HMC703LP4E inputs according to feedback control loop and external reference crystal oscillator carry out phase demodulation The built-in current-type charge pump of rear control exports stepped modulation electric current, after active loop filter filtering, becomes modulation electricity Voltage-controlled ultra broadband voltage controlled oscillator processed carries out the output of swept-frequency signal.All control signals of phase-locked loop circuit part have numeral control Making sheet card produces, and uses resistor network to carry out power distribution.By loop filter parameters is carried out early stage design of Simulation Checking, makes output signal have the phase noise performance of optimum, as shown in figs 2-4.

(2) power distribution portion: owing to the introducing of radio-frequency devices can bring insertion loss, here with low-noise amplifier ADL5601 amplifies signal power and meets the transmitting power requirement of transmitter, as shown in Figure 5.

(3) filtering channel selects part: voltage controlled oscillator output signal frequency is 2～4GHz, meeting in the range of 4～8GHz Produce harmonic wave.As it is shown in figure 5, by adding band filter, filter high-frequency harmonic, complete ultra broadband voltage controlled oscillator is exported The out-of-band harmonics suppression of signal.

Phase-locked loop chip of the present utility model, loop filter, band filter, voltage controlled oscillator and low noise amplification Chip can also use the chip of other models to realize.

This utility model additionally provides a kind of radio communication device, including described UWB-LFM based on PLL Signal generating circuit.

Although detailed description of the invention of the present utility model is described by the above-mentioned accompanying drawing that combines, but not new to this practicality The restriction of type protection domain, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, ability Field technique personnel need not to pay various amendments or deformation that creative work can make still at protection model of the present utility model Within enclosing.

Claims

1. a ultra wide-band linear frequency modulated signals based on PLL produces circuit, it is characterised in that include phase-locked loop chip, described Phase-locked loop chip is connected with the outfan of temperature compensating crystal oscillator, and described temperature compensating crystal oscillator is for providing shake fixed reference for phase-locked loop chip Clock；

The outfan of described phase-locked loop chip is connected with the input of loop filter, the outfan of described loop filter and pressure The input of controlled oscillator is connected；The outfan of described voltage controlled oscillator is connected with power distributing circuit；Described power distribution electricity Road output two-way merit sub-signal, a road is connected with amplifying circuit, and another road feeds back to the radio-frequency (RF) signal input end of phase-locked loop chip；

The outfan of described amplifying circuit is connected with the input of band filter, and the outfan output linearity of band filter is adjusted Frequently signal.

2. ultra wide-band linear frequency modulated signals based on PLL as claimed in claim 1 produces circuit, it is characterised in that described ring Path filter uses active proportional-integral filter.

3. ultra wide-band linear frequency modulated signals based on PLL as claimed in claim 1 produces circuit, it is characterised in that described band Bandpass filter is S-band band filter.

4. ultra wide-band linear frequency modulated signals based on PLL as claimed in claim 1 produces circuit, it is characterised in that described in put Big circuit includes amplification chip, and the outfan of described amplification chip is connected with power supply by an inductance element, inductance element and electricity Also it is connected with three electric capacity being connected in parallel at the point of contact in source.

5. a radio communication device, it is characterised in that include the ultra broadband based on PLL as described in claim 1-4 is arbitrary Linear FM signal produces circuit.