CN102420607A - ODU (outdoor unit) frequency source - Google Patents
ODU (outdoor unit) frequency source Download PDFInfo
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- CN102420607A CN102420607A CN2011103868652A CN201110386865A CN102420607A CN 102420607 A CN102420607 A CN 102420607A CN 2011103868652 A CN2011103868652 A CN 2011103868652A CN 201110386865 A CN201110386865 A CN 201110386865A CN 102420607 A CN102420607 A CN 102420607A
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Abstract
The invention relates to an ODU (outdoor unit) frequency source. A clock signal output end of a quartz crystal oscillator of the ODU frequency source is connected with a signal input end of a decimal N fractional frequency synthesizer, a signal output end of the decimal N fractional frequency synthesizer is connected with a coupler through a voltage-controlled oscillator, a coupling passageway of the coupler is connected with an emitted intermediate frequency mixer of the ODU, a main passageway of the coupler is connected with an input end of a power distributor, one output end of the power distributor is connected with an input end of a first frequency multiplier, the other output end of the power distributor is connected with an input end of a second frequency multiplier, an output end of the first frequency multiplier is connected with a microwave emission frequency mixer of the ODU, and an output end of the second frequency multiplier is connected with a microwave receiving frequency mixer of the ODU; and another clock signal output end of the quartz crystal oscillator is connected with a receiving intermediate frequency mixer of the ODU through an integer N fractional frequency synthesizer. According to the invention, the quantity of frequency sources required to be designed is reduced, and the efficiency of ODU frequency source design is improved.
Description
Technical field
The present invention relates to radio-frequency technique design field in the mobile communication, be specifically related to a kind of ODU (Outdoor Unit, digital microwave transceiver) frequency source.
Technical background
In wireless communication system; Microwave communication is along with development mobile and data communication; Move covering and this two big demand of transfer of data and become (Plesiochronous Digital Hierarchy gradually PDH; PDH) with SDH (Synchronous Digital Hierarchy, the synchronous digital hierarchy) requirement that microwave is new.With regard to the use of frequency range, the 5GHz～11GHz frequency range by former use develops to 13GHz～38GHz frequency range gradually, with further expansion frequency spectrum resource.With regard to the structure of equipment, progressively abandoned the project organization of traditional indoor all-in-one, it is littler and tear open and move easy transceiver at outdoor (ODU), modulation and the baseband interface split-type structural at indoor (IDU) to develop into existing volume.Be adapted to big span and stride the wireless data transmission of lake transmission section over strait.
The digital microwave transceiver mainly provides the intermediate frequency digital modulation signals of communicating by letter and the mutual translation function of radiofrequency signal with IDU (Indoor Uint digital microwave indoor unit).Comprise transmitter, receiver, frequency source, power detection and report, unit module such as OOK (On-Off Keying, binary system on off keying) modulation.
Traditional ODU system frequency source, as shown in Figure 1, adopt three PLL (Phase Locked Loop is called for short phase-locked loop) loop to carry out the design of design frequency source, its frequency architecture design is:
TX_IF refers to emission medium-frequency, and existing the requirement is 350MHz in the ODU system;
The RX_IF finger is received intermediate frequency, and existing the requirement is 140MHz in the ODU system;
TX_RF refers to the microwave tranmitting frequency; RX_RF is the microwave receiving frequency; These two frequencies are confirmed by specific system and frequency interval, and in the ODU system, pair of O DU forms a cover receive-transmit system often, promptly have one microwave frequency to send out receipts high for low among the cover ODU, and the microwave frequency that has is low receipts occurred frequently.
For transmitting chain; Emission medium-frequency up-converts to TX_IF for the first time and carries out up-conversion with first frequency source LO 1; Frequency after the mixing is TX_IF+LO1, and up-conversion then is mixer directly to the microwave tranmitting frequency with frequency for the second time, generally adopts IC frequency doubling device (being two 2 frequencys multiplication among Fig. 1) that frequency multiplication is carried out in second frequency LO2 source; Adopt the local frequency frequency multiplication of the mode mixing for the second time of 4 frequencys multiplication to arrive 4LO2, then the frequency behind the secondary mixing is: TX_IF+LO1+4*LO2=TX_RF;
For receiving link; Local oscillation signal and transmitting chain after the frequency multiplication are shared; The frequency of down-conversion should be for the first time: RX_RF-4*LO2; Through carrying out the down-conversion second time after a series of amplifications and the filtering, what at this moment adopt is that the 3rd frequency source signal carries out down-conversion, and the signal that mixing is closed is: RX_RF-4*LO2-LO3=RX_IF receives intermediate frequency;
The ODU frequency source need design the frequency source of LO1, LO2 and three fractional frequency divisions of LO3; To frequency adjustment stepping requirement, when carrying out frequency configuration, the frequency source of three loop design all needs to change to system; The designing requirement of making an uproar mutually to three frequency sources is higher; The frequency spurious signal that in system, is produced will be abundanter, and in the production debugging, the spuious debugging of parts or complete machine is difficulty comparatively.
Summary of the invention
The objective of the invention is provides a kind of ODU frequency source to above-mentioned technical problem, and this frequency source can reduce design fundamental frequency source quantity, the setting of convenient various frequencies.
For realizing this purpose; A kind of ODU frequency source that the present invention designed comprises quartz oscillator, decimal Fractional-N frequency frequency synthesizer, voltage controlled oscillator, and it is characterized in that: it also comprises Integer N crossover frequency synthesizer; Coupler, power divider, first frequency multiplier and second frequency multiplier; Wherein, a clock signal output terminal of quartz oscillator connects the signal input part of decimal Fractional-N frequency frequency synthesizer, and the signal output part of decimal Fractional-N frequency frequency synthesizer connects coupler through voltage controlled oscillator; The coupling path of coupler connects the emission medium-frequency frequency mixer of ODU; The primary path of coupler connects the input of power divider, and an output of power divider connects the input of first frequency multiplier, and another output of power divider connects the input of second frequency multiplier; The output of said first frequency multiplier connects the microwave transmitting mixer of ODU, and the output of second frequency multiplier connects the microwave receiving mixer of ODU; Another clock signal output terminal of said quartz oscillator connects the reception intermediate frequency mixer of ODU through Integer N crossover frequency synthesizer.
Said first frequency multiplier is 6 frequency multiplication frequency multipliers.
Said second frequency multiplier is 7 frequency multiplication frequency multipliers.
Be provided with filtering, amplifying unit between the reception intermediate frequency mixer of said Integer N crossover frequency synthesizer and ODU.
Be connected with amplifier between said voltage controlled oscillator and the coupler.
The degree of coupling of said coupler is 3～20dB.
The model of said decimal Fractional-N frequency frequency synthesizer is ADF4153; The model of said Integer N crossover frequency synthesizer is ADF4360.
The present invention has reduced the frequency source quantity of required design, adopts two frequency source designs, and one is the frequency source of decimal Fractional-N frequency; One is the frequency source of Integer N frequency division, to the requirement of system to the frequency adjustment stepping, when carrying out frequency configuration; Only need the frequency source of adjustment decimal Fractional-N frequency to get final product; Improved ODU frequency source efficiency of design, in addition, the present invention has also realized the compatibility to the different T/R introns of under the planning of same ODU system frequency each system.
Description of drawings
The theory diagram of Fig. 1 prior art.
Fig. 2 theory diagram of the present invention.
Fig. 3 is the theory diagram of user mode of the present invention.
Among Fig. 1 and 3; The input of the emission medium-frequency frequency mixer of ODU is disposed with filter, attenuator, amplifier, wave detector; Be provided with filter and amplifier between the emission medium-frequency frequency mixer of ODU and the microwave transmitting mixer of ODU, the microwave transmitting mixer output of ODU sets gradually filter, amplifier, attenuator, amplifier, wave detector; The microwave receiving mixer input of ODU is provided with the filtering amplifying unit; Between the reception intermediate frequency mixer of microwave receiving mixer and ODU filtering, amplification, attenuation units are set, the output of the reception intermediate frequency mixer of ODU sets gradually RF switch, filter, RF switch, amplifier and AGC amplifier.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description:
A kind of ODU frequency source shown in Fig. 2～3; Comprise quartz oscillator TCXO, decimal Fractional-N frequency frequency synthesizer, voltage controlled oscillator VCO; It is characterized in that: it also comprises Integer N crossover frequency synthesizer, coupler, power divider, first frequency multiplier and second frequency multiplier, wherein; The sinusoidal wave clock signal output terminal of the peak clipping of quartz oscillator TCXO connects the signal input part of decimal Fractional-N frequency frequency synthesizer; The signal output part of decimal Fractional-N frequency frequency synthesizer connects coupler through voltage controlled oscillator VCO, and the coupling path of coupler connects the emission medium-frequency frequency mixer of ODU, and the primary path of coupler connects the input of power divider; An output of power divider connects the input of first frequency multiplier; Another output of power divider connects the input of second frequency multiplier, and the output of said first frequency multiplier connects the microwave transmitting mixer of ODU, and the output of second frequency multiplier connects the microwave receiving mixer of ODU; The sinusoidal wave clock signal output terminal of another peak clipping of said quartz oscillator TCXO connects the reception intermediate frequency mixer of ODU through Integer N crossover frequency synthesizer.
In the technique scheme, first frequency multiplier is 6 frequency multiplication frequency multipliers.Second frequency multiplier is 7 frequency multiplication frequency multipliers.
In the technique scheme, be provided with filtering, amplifying unit between the reception intermediate frequency mixer of Integer N crossover frequency synthesizer and ODU.
In the technique scheme, be connected with amplifier between said voltage controlled oscillator VCO and the coupler.
In the technique scheme, the degree of coupling of said coupler is 3～20dB.Select suitable coupler according to the watt level of local oscillator LO1 and the difference of the desired watt level of emission medium-frequency frequency mixer local oscillator.
In the technique scheme, the model of said decimal Fractional-N frequency frequency synthesizer is ADF4153; The model of said Integer N crossover frequency synthesizer is ADF4360.
In the technique scheme; Integer N crossover frequency synthesizer ADF4360 is the programmable phase-locked loop chip of a built-in VCO; Be designed to receive the fixedly local oscillator of link, utilize its inner parametric frequency divider (R frequency divider), programmable frequency divider (Fractional-N frequency device), phase discriminator, current pump and warning circuit etc. to accomplish the functions of combining frequently such as frequency division, phase demodulation and alarm in this circuit design.Fixedly the frequency of local oscillator is the 490MHz+TR interval, and therefore just no longer change of this frequency after the ODU model is selected selects bigger phase demodulation frequency reduction phase noise as much as possible for use.The maximum phase demodulation frequency that this chip allows is 8MHz, and phase demodulation frequency must be the common divisor in output frequency and reference oscillation source simultaneously.
In the technique scheme, decimal Fractional-N frequency frequency synthesizer ADF4153 is designed to variable local oscillator, offers twice up-conversion of transmitting chain and receives the link local frequency source of down-conversion for the first time.Utilize its inner parametric frequency divider (R frequency divider), programmable frequency divider (INT+FRAC/MOD frequency divider), phase discriminator, current pump and warning circuit etc. to accomplish the functions of combining frequently such as frequency division, phase demodulation and alarm in the design.Because the transmitter stepping is 250kHz, be 250/7kHz so require the local oscillator stepping.When incoming frequency during greater than 2GHz, preposition frequency dividing ratio can only select 8/9, and at this moment the N minimum value is 91.In order to obtain phase noise preferably, select R=1.In order to satisfy the minimum step requirement, 20000/MOD is necessary for 250/7 approximate number.
In the technique scheme, voltage controlled oscillator VCO is local oscillator key for design parts, and it has determined the noiseproof feature in local frequency source to a great extent, and phase-locked loop is to the VCO noise unrestraint beyond the loop bandwidth.
Principle of the present invention is: for transmitting chain; The local oscillation signal LO1 of voltage controlled oscillator VCO output carries out getting into coupler after the processing and amplifying; The signal of coupler coupling path output is to the emission medium-frequency frequency mixer of ODU; Be used for the first time up-conversion of emission medium-frequency TX_IF to microwave tranmitting frequency TX_RF, the signal frequency after the mixing is: LO1 ± TX_IF; The frequency signal of local oscillation signal LO1 after via amplifier, coupler primary path, power splitter, 6 frequency multipliers is 6LO1; The microwave transmitting mixer that connects ODU; The output frequency signal of the emission medium-frequency frequency mixer of ODU is LO1 ± TX_IF+6*LO1 via the signal frequency that the microwave transmitting mixer of ODU carries out after the secondary up-conversion; This frequency signal is microwave tranmitting frequency TX_RF, and the frequency translation relation of transmitting chain is: LO1 ± TX_IF+6*LO1=TX_RF.
For receiving link; RX_RF microwave receiving frequency is connected to the microwave receiving mixer of ODU after via filtering, amplifying unit; The frequency signal of local oscillation signal LO1 after via amplifier, coupler primary path, power splitter, 7 frequency multipliers is 7LO1; Insert the LO input of the microwave receiving mixer of ODU; Signal behind the microwave receiving mixer of ODU is RX_RF-7*LO1, behind the agc circuit that wave filter, amplifier and attenuator etc. are formed, arrives the reception intermediate frequency mixer of ODU, and the down-conversion local oscillation signal LO2 of Integer N crossover frequency synthesizer output is connected to the LO end of the reception intermediate frequency mixer of ODU after via filter, amplifying unit; Signal after the reception intermediate frequency mixer down-conversion of ODU is LO2 ± (RX_RF-7*LO1); This frequency signal is and receives intermediate frequency RX_IF, selects to export behind circuit, amplifier and the agc circuit via the bandwidth that RF switch and filter are formed, and the frequency translation relation that receives link is: LO2 ± (RX_RF-7*LO1)=RX_IF.
The frequency translation of work of the present invention is accomplished by the frequency translation of LO1, because LO2 is a fixed frequency, the transmitting-receiving frequency conversion in the system works can keep synchronous.
The content that this specification is not done to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (7)
1. ODU frequency source; Comprise quartz oscillator, decimal Fractional-N frequency frequency synthesizer, voltage controlled oscillator; It is characterized in that: it also comprises Integer N crossover frequency synthesizer, coupler, power divider, first frequency multiplier and second frequency multiplier, wherein; A clock signal output terminal of quartz oscillator connects the signal input part of decimal Fractional-N frequency frequency synthesizer; The signal output part of decimal Fractional-N frequency frequency synthesizer connects coupler through voltage controlled oscillator, and the coupling path of coupler connects the emission medium-frequency frequency mixer of ODU, and the primary path of coupler connects the input of power divider; An output of power divider connects the input of first frequency multiplier; Another output of power divider connects the input of second frequency multiplier, and the output of said first frequency multiplier connects the microwave transmitting mixer of ODU, and the output of second frequency multiplier connects the microwave receiving mixer of ODU; Another clock signal output terminal of said quartz oscillator connects the reception intermediate frequency mixer of ODU through Integer N crossover frequency synthesizer.
2. ODU frequency source according to claim 1 is characterized in that: said first frequency multiplier is 6 frequency multiplication frequency multipliers.
3. ODU frequency source according to claim 1 and 2 is characterized in that: said second frequency multiplier is 7 frequency multiplication frequency multipliers.
4. ODU frequency source according to claim 1 is characterized in that: be provided with filtering, amplifying unit between the reception intermediate frequency mixer of said Integer N crossover frequency synthesizer and ODU.
5. ODU frequency source according to claim 1 is characterized in that: be connected with amplifier between said voltage controlled oscillator and the coupler.
6. ODU frequency source according to claim 1 is characterized in that: the degree of coupling of said coupler is 3～20dB.
7. ODU frequency source according to claim 1 is characterized in that: the model of said decimal Fractional-N frequency frequency synthesizer is ADF4153; The model of said Integer N crossover frequency synthesizer is ADF4360.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103868652A CN102420607A (en) | 2011-11-29 | 2011-11-29 | ODU (outdoor unit) frequency source |
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| CN2011103868652A CN102420607A (en) | 2011-11-29 | 2011-11-29 | ODU (outdoor unit) frequency source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039519A (en) * | 2020-08-12 | 2020-12-04 | 中国电子科技集团公司第四十一研究所 | Large-dynamic-range high-precision power control method for ultra-wideband millimeter wave signals |
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| WO2002047248A1 (en) * | 2000-11-03 | 2002-06-13 | Ensemble Communications, Inc. | Very low noise local oscillator for use in wireless communication transceiver |
| US20040203337A1 (en) * | 2002-09-05 | 2004-10-14 | Xytrans, Inc. | Low cost VSAT MMIC transceiver with automatic power control |
| CN1669216A (en) * | 2002-07-10 | 2005-09-14 | 汤姆森许可贸易公司 | Vhf adapter for cable network |
| CN101931428A (en) * | 2009-12-23 | 2010-12-29 | 航天恒星空间技术应用有限公司 | 2 local oscillation (LO) class frequency coordination design method for digital microwave outdoor unit (ODU) system |
| CN202334496U (en) * | 2011-11-29 | 2012-07-11 | 武汉凡谷电子技术股份有限公司 | Optical density unit (ODU) frequency source |
-
2011
- 2011-11-29 CN CN2011103868652A patent/CN102420607A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002047248A1 (en) * | 2000-11-03 | 2002-06-13 | Ensemble Communications, Inc. | Very low noise local oscillator for use in wireless communication transceiver |
| CN1669216A (en) * | 2002-07-10 | 2005-09-14 | 汤姆森许可贸易公司 | Vhf adapter for cable network |
| US20040203337A1 (en) * | 2002-09-05 | 2004-10-14 | Xytrans, Inc. | Low cost VSAT MMIC transceiver with automatic power control |
| CN101931428A (en) * | 2009-12-23 | 2010-12-29 | 航天恒星空间技术应用有限公司 | 2 local oscillation (LO) class frequency coordination design method for digital microwave outdoor unit (ODU) system |
| CN202334496U (en) * | 2011-11-29 | 2012-07-11 | 武汉凡谷电子技术股份有限公司 | Optical density unit (ODU) frequency source |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039519A (en) * | 2020-08-12 | 2020-12-04 | 中国电子科技集团公司第四十一研究所 | Large-dynamic-range high-precision power control method for ultra-wideband millimeter wave signals |
| CN112039519B (en) * | 2020-08-12 | 2022-09-20 | 中国电子科技集团公司第四十一研究所 | Large-dynamic-range high-precision power control method for ultra-wideband millimeter wave signals |
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Application publication date: 20120418 |