CN202143071U - Frequency conversion module of digital fiber repeater access terminal - Google Patents
Frequency conversion module of digital fiber repeater access terminal Download PDFInfo
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- CN202143071U CN202143071U CN201120146242U CN201120146242U CN202143071U CN 202143071 U CN202143071 U CN 202143071U CN 201120146242 U CN201120146242 U CN 201120146242U CN 201120146242 U CN201120146242 U CN 201120146242U CN 202143071 U CN202143071 U CN 202143071U
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Abstract
The utility model is suitable for the mobile communication field, and provides a frequency conversion module of a digital fiber repeater access terminal. The frequency conversion module is a printed circuit board possessing four layers of plates, wherein a first layer is used for the radio frequency wiring and the main wiring of a digital circuit, and the first layer includes a medium diplexer, a downlink signal amplifier and an uplink signal amplifier which are connected with the medium diplexer, a local oscillator and system clock circuit and an uplink/downlink frequency conversion control circuit which are connected with the downlink signal amplifier and the uplink signal amplifier respectively; a second layer is a grounding plate; a third layer is used for the wiring of a power supply and the wiring of a low frequency signal wire, and the third layer includes a power supply converting circuit which gives power to the frequency conversion module; and a forth layer is a GND layer. Based on the phase-locked loop frequency synthesis, an uplink/downlink frequency converter, the system clock circuit, and the medium diplexer are integrated in the frequency conversion module, so the frequency conversion module has the characteristics of high isolation, high stability, and low phase noise on the premise of high integrated level and low cost control.
Description
Technical field
The utility model belongs to moving communicating field, relates in particular to a kind of digital optical fiber direct station incoming end frequency-variable module.
Background technology
Current, transmission error rates is low, transport tape is roomy, two-forty, jumbo communication system have become Development Trend, at WCDMA (Wideband Code Division Multiple Access; WCDMA) in the communication system; Digital optical fiber direct station both can adapt to the needs of main equipment producer distributed base station as the new-type network optimizing equipment, can break away from base station producer fully again; Flexible configuration is to enlarge the range of application of product.Because the inversion frequency of analog signal and digital signal is generally lower; Therefore, digitized optical fiber repeater be realized, the mutual conversion of radiofrequency signal and intermediate-freuqncy signal must be realized through frequency-variable module; Simultaneously, whole repeater also needs the system clock of a high stable.
Traditional digital optical fiber direct station incoming end structure is as shown in Figure 1; Can find out with reference to Fig. 1; The mode that it has adopted metal duplexer and up-downgoing frequency converter to separate design, encapsulation, and owing to consider system clock and frequency converter easy mutual interference mutually, the two also separately designs; Therefore, make whole repeater take that the complete machine space is big, manufacturing cost is high, production efficiency is low.
The utility model content
The purpose of the utility model is to provide a kind of digital optical fiber direct station incoming end frequency-variable module, is intended to solve existing digital optical fiber direct station and takies the problem that the complete machine space is big and manufacturing cost is high.
The utility model is achieved in that a kind of digital optical fiber direct station incoming end frequency-variable module, and said frequency-variable module is the printed circuit pcb board of four laminates, and wherein, the ground floor of said pcb board is used for the main wiring of radio frequency and digital circuit, comprising:
Dielectric duplexer; Downstream signal amplifier that is connected with dielectric duplexer and upward signal amplifier; The local oscillator and the system clock circuit that are connected with said upward signal amplifier with said downstream signal amplifier respectively; Respectively with said downstream signal amplifier be connected with said upward signal amplifier on/descending frequency conversion control circuit;
The second layer is a ground plate; The 3rd layer of wiring that is used for power supply and low frequency signal is included as the power-switching circuit that said frequency-variable module is supplied power; The 4th layer is the GND layer.
Further, said pcb board adopts independently cavity respectively said dielectric duplexer, said upward signal amplifier, said downstream signal amplifier and said local oscillator and system clock circuit to be isolated.
Further, said pcb board is positioned at the aluminum box body.
Further; Said downstream signal amplifier is connected with said dielectric duplexer; Comprise downlink radio-frequency signal amplifying circuit, frequency mixer and descending medium-frequency signal amplification circuit, said frequency mixer connects the output of said downlink radio-frequency signal amplifying circuit and the input of said descending medium-frequency signal amplification circuit;
Said upward signal amplifier is connected with said dielectric duplexer; Comprise up medium-frequency signal amplification circuit, frequency mixer and up rf signal amplification circuit, said frequency mixer connects the output of said up medium-frequency signal amplification circuit and the input of said up rf signal amplification circuit.
Further; Said rf signal amplification circuit comprises first automatic electric-level control ALC chip, first amplifier tube and first numerical control decay chip, and said first amplifier tube connects the output of a said ALC chip and the input of said first numerical control decay chip;
Said frequency mixer comprises first filter, first mixer tube and LC filter, and said first mixer tube connects the output of said first filter and the input of said LC filter;
Said descending intermediate-freuqncy signal comprises second amplifier tube.
Further, said up medium-frequency signal amplification circuit comprises the 2nd ALC chip and the 3rd amplifier tube, and the output of said the 2nd ALC chip is connected with the input of said the 3rd amplifier tube;
Said up rf signal amplification circuit comprises second filter, the 4th amplifier tube, second numerical control decay chip, the 3rd filter and the 5th amplifier tube; Said the 4th amplifier tube connects the output of said second filter and the input of said second numerical control decay chip, and said the 3rd filter connects the output of said second numerical control decay chip and the input of said the 5th amplifier tube.
Further, said local oscillator and system clock circuit comprise the 6th amplifier tube, and the up local oscillation circuit that is connected with said the 6th amplifier tube, descending local oscillation circuit and system clock produce circuit.
Further, on said/descending frequency conversion control circuit comprises microcontroller, and the memory, communication interface and the temperature sensing circuit that are connected with said microcontroller.
Further, on said/descending frequency conversion control circuit connects said first numerical control decay chip and said second numerical control decay chip respectively.
Further, said frequency-variable module also comprises power-sensing circuit, and said power-sensing circuit is connected with said downstream signal amplifier input terminal, output and the output of said upward signal amplifier respectively.
The utility model embodiment is synthetic based on phase-locked loop frequency; In a frequency-variable module, up-downgoing frequency converter, system clock circuit and dielectric duplexer have been integrated; Under the prerequisite of high integration and low-cost control, this frequency-variable module has the characteristics of high-isolation, high stability and low phase noise.
Description of drawings
Fig. 1 is the structure chart of the digital optical fiber direct station incoming end that provides of prior art;
Fig. 2 is the cut-away view of the digital optical fiber direct station incoming end frequency-variable module that provides of the utility model;
Fig. 3 is the concrete structure figure of the digital optical fiber direct station incoming end frequency-variable module downstream signal amplifying circuit that provides of the utility model;
Fig. 4 is the concrete structure figure of the digital optical fiber direct station incoming end frequency-variable module upward signal amplifying circuit that provides of the utility model;
Fig. 5 is the digital optical fiber direct station incoming end frequency-variable module local oscillator that provides of the utility model and the concrete structure figure of system clock circuit;
Fig. 6 is on the digital optical fiber direct station incoming end frequency-variable module that provides of the utility model/the concrete structure figure of descending frequency conversion control circuit.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The utility model embodiment is synthetic based on phase-locked loop frequency; In a frequency-variable module, up-downgoing frequency converter, system clock circuit and dielectric duplexer have been integrated; Under the prerequisite of high integration and low-cost control, this frequency-variable module has the characteristics of high-isolation, high stability and low phase noise.
This digital optical fiber direct station incoming end frequency-variable module is positioned at an aluminum box body, and (Printed Circuit Board PCB) realizes the printed circuit board (PCB) that its internal structure designs based on four laminates, makes the EMC of module and signal integrity better.Its pcb board material can adopt FR-4, thickness of slab 1.2mm.Wherein, Ground floor; It is top layer; Be mainly used in the main wiring of radio frequency wiring and digital circuit, concentrated the most function modular circuit of frequency-variable module, comprise dielectric duplexer, downstream signal amplifier, upward signal amplifier, local oscillator and system clock circuit and on/descending frequency conversion control circuit; The second layer is a ground plate; The 3rd layer of wiring that is mainly used in power supply and indivedual low frequency signal lines, the function module circuit that comprises has power-switching circuit; The 4th layer, promptly bottom is the GND layer.
In the utility model embodiment, in order to prevent that circuit from passing through the space and forming positive feedback, and in order to prevent the interference of digital circuit and radiofrequency signal, whole pcb board adopts independently cavity that the above-mentioned functions modular circuit is isolated.For example: local oscillation circuit, upward signal amplifier and downstream signal amplifier are isolated with a chamber and other circuit separately.
In the utility model embodiment; The aluminum box body of encapsulation pcb board is fixed in the cavity in the cabinet through 4 screws again; Totally 4 interfaces; 3 SMA interfaces are respectively as radiofrequency signal input, the output of intermediate-freuqncy signal and the output of system clock, and 1 N interface is as the common interface of data feedback channel and down going channel.Six pin ISP programming slot, 485 communication interfaces and the CONTROLLED POTENTIAL device knob of single-chip microcomputer are placed the feedthrough capacitor and the binding post of power supply in the upper shed of box body cover plate in the side of box body.
Fig. 2 shows the internal structure of the digital optical fiber direct station incoming end frequency-variable module that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model.
With reference to Fig. 2; This digital optical fiber direct station incoming end frequency-variable module comprise dielectric duplexer 21, downstream signal amplifier 22, upward signal amplifier 23, local oscillator and system clock circuit 24, on/descending frequency conversion control circuit 25 and power-switching circuit 26, be described in detail down in the face of above-mentioned frequency-variable module part:
With reference to Fig. 3; In downlink radio-frequency signal amplifier 221; Automatic electric-level control (Automatic Level Control; ALC) output of chip 2211 is connected with the input of first amplifier tube 2212, and the output of first amplifier tube 2212 is connected with the input of first numerical control decay chip 2213, wherein:
The downlink radio-frequency signal that the one ALC chip 2211 receives from alms giver's end; And through ALC control level adjustment circuit and ALC control circuit the downlink radio-frequency signal of importing is carried out automatic electric-level and control; No matter make that the input signal power how, all can be controlled at it in maximum gain scope of repeater.A realization example as the utility model; The one ALC chip 2211 can adopt the HSMP-3816 of Avago company; This chip can be realized the voltage-controlled attenuation range of 30dB, and the ALC control circuit can adopt LM2904 to realize, has characteristics simple in structure, that cost is low.
Downlink radio-frequency signal through the output of first amplifier tube 2212 is by the adjustment that gains of first numerical control decay chip 2213.
In frequency mixer 222, the output of first filter 2221 is connected with the input of first mixer tube 2222, and the output of first mixer tube 2222 is connected with the input of LC filter 2223; Wherein, first mixer tube 2222 can adopt the HMC304 of HITTITE company, and its typical performance index are following: bandwidth 1700MHz to 3000MHz; About WCDMA frequency Insertion Loss 9dB; The IPC representative value is 30dBm, and L-R isolation 41dB, L-I isolation are 17dB.This mixer tube has the low characteristics of cost.
After converting downlink radio-frequency signal into descending intermediate-freuqncy signal through mixer tube 2222, leach the noise signal beyond the intermediate frequency through LC filter 2223.
In descending medium-frequency signal amplification circuit 223; Specifically can realize through second amplifier tube; It plays the effect that second level signal amplifies in the downstream signal amplifier; Can use the high-gain tube PW118 of PREWELL company, its typical performance index are following: gain 29dB, P1dB is that 20.8dBm and OIP3 are 40dBm.
As an embodiment of the utility model, increase power-sensing circuit 224 through input and output at downstream signal amplifier 22, the downlink radio-frequency signal of input and the descending intermediate-freuqncy signal of output are carried out power detection.This power-sensing circuit 224 can adopt average detector spare AD8362, and it detects frequency range is 50Hz to 2.7GHz, therefore, from if-to-rf very on a large scale in can use this device, and the power dynamic range of its detection is from-52dBm to 8dBm.
Upward signal amplifier 23 is connected with dielectric duplexer 21, and its up intermediate-freuqncy signal mixing that will import is enlarged into up radiofrequency signal, and holds output through the alms giver.This upward signal amplifier 23 has specifically comprised up medium-frequency signal amplification circuit 231, frequency mixer 232 and up radio frequency amplifying signal circuit 233; Wherein, The output of up medium-frequency signal amplification circuit 231 is connected with the input of frequency mixer 232; The output of frequency mixer 232 is connected with the input of up rf signal amplification circuit 232, and its concrete circuit structure is as shown in Figure 4.
With reference to Fig. 4; In up medium-frequency signal amplification circuit 231; The output of the 2nd ALC chip 2311 is connected with the input of the 3rd amplifier tube 2312; The 2nd ALC chip 2311 receives the up intermediate-freuqncy signal of input, and through ALC control level adjustment circuit and ALC control circuit the up intermediate-freuqncy signal of input is carried out automatic electric-level control.As an embodiment of the utility model, the 2nd ALC chip 2211 can use the HSMP-3816 of Avago company.The 3rd amplifier tube 2312 is used for that the up intermediate-freuqncy signal of input is carried out the first order and amplifies.As a realization example of the utility model, the 3rd amplifier tube 2312 can realize that this pipe has the gain of 14.5dB through the AG602 of WJ company; When single-tone output 2dBm; P1dB is 18.6dBm, and OIP3 reaches 33.8dBm, and this pipe has advantage cheaply.
That local oscillator and system clock circuit 24 adopt is frequency synthesizer and discrete voltage controlled oscillator (Voltage Controlled Oscillator; VCO) scheme; Reference signal can adopt the TCXO of the big general 30.72MHz of company, and its phase noise is-130dBc/Hz1KHz.The concrete structure of local oscillator and system clock circuit 24 is as shown in Figure 5, wherein:
The reference signal of the input of the 6th amplifier tube 241 for selecting, this pipe can use the 2SCS3356 of NEC Corporation, its typical technology index: noise factor is 2.0dB, gain 11.5dB, reciprocal capacitance 1.0pF, cut-off frequency 7GHz.
Up local oscillation circuit 242 is identical with the circuit structure of descending local oscillation circuit 243; Comprise the frequency synthesizer that is connected with the output of the 6th amplifier tube 241, loop filter that is connected with the output of frequency synthesizer and the VCO that is connected with the output of loop filter.Wherein, frequency synthesizer can use the ADF4153 of Analog company, and its typical performance is following: fractional frequency division, frequency be up to 4GHz, the 2.7V-3.3V power supply, charge pump supply power separately and charging current adjustable, the bottom phase noise is-213dBc/Hz.VCO can adopt the MVCO1845 and the MVCO2045 of the rich prestige in Hebei, and its typical performance index are following: power supply 5V, VT 0.5V-4.5V; Tuning sensitivity 15MHz/V and 15MHz/V; Frequency pushing coefficient 2MHz/V (5V ± 0.25V), phase noise-106dBc/Hz10KHz of MVCO1845 ,-127dBc/Hz100KHz; The phase place of MVCO2045 is made an uproar-105dBc/Hz10KHz ,-125dBc/Hz100KHz.
In the utility model embodiment, on the implementation method of frequency synthesis, adopted the phase-locked loop frequency synthetic method, can obtain phase noise preferably, and cost is low, circuit is simple, and reliability is high, and production efficiency is high, is fit to carry out large-scale production more.
In the utility model embodiment, the frequency mixer of being imported respectively in the uplink and downlink signal amplifier by the up local oscillation circuit 242 and the local oscillation signal of descending local oscillation circuit 243 outputs carries out mixing.
System clock produces 244 in circuit and is produced by phase-locked loop; It has comprised the frequency synthesizer 2441 that is connected with the output of the 6th amplifier tube 241; The loop filter 2442 that is connected with the output of frequency synthesizer 2441, and the VCXO 2443 that is connected with the output of loop filter 2442.Frequency synthesizer 2441 can adopt the ADF4118 of AD company, and this is a integer frequency divider, and its typical supply power voltage is 3.3V, and the bottom phase noise is-170dBc/Hz25KHz.VCXO 2443 can adopt the V936-B611 of big general company, and its typical supply power voltage is 3.3V, its phase noise-100dBc/Hz100Hz ,-128dBc/Hz1KHz ,-135dBc/Hz10KHz.
On/concrete structure of descending frequency conversion control circuit 25 is as shown in Figure 6, is made up of microcontroller 251 and peripheral circuit thereof, comprising:
In the utility model embodiment, on/control signal of descending frequency conversion control circuit 25 outputs imports respectively/the numerical control decay chip of downstream signal amplifier, and receive signal from power-sensing circuit.
Characteristics such as the supply power voltage of power-switching circuit 26 is 9V, adopts traditional LM7805, has good reliability, and ripple is little, and spurious signal is little.
The utility model embodiment is synthetic based on phase-locked loop frequency; In a frequency-variable module, up-downgoing frequency converter, system clock circuit and dielectric duplexer have been integrated; Make this frequency-variable module have the characteristics of high-isolation, high stability and low phase noise; The complete machine that has reduced digital optical fiber direct station takes up room, and has reduced production cost, has improved production efficiency.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (10)
1. a digital optical fiber direct station incoming end frequency-variable module is characterized in that, said frequency-variable module is the printed circuit pcb board of four laminates, and wherein, the ground floor of said pcb board is used for the main wiring of radio frequency and digital circuit, comprising:
Dielectric duplexer; Downstream signal amplifier that is connected with dielectric duplexer and upward signal amplifier; The local oscillator and the system clock circuit that are connected with said upward signal amplifier with said downstream signal amplifier respectively; Respectively with said downstream signal amplifier be connected with said upward signal amplifier on/descending frequency conversion control circuit;
The second layer is a ground plate; The 3rd layer of wiring that is used for power supply and low frequency signal is included as the power-switching circuit that said frequency-variable module is supplied power; The 4th layer is the GND layer.
2. frequency-variable module as claimed in claim 1 is characterized in that, said pcb board adopts independently cavity respectively said dielectric duplexer, said upward signal amplifier, said downstream signal amplifier and said local oscillator and system clock circuit to be isolated.
3. frequency-variable module as claimed in claim 1 is characterized in that said pcb board is positioned at the aluminum box body.
4. frequency-variable module as claimed in claim 1; It is characterized in that; Said downstream signal amplifier is connected with said dielectric duplexer; Comprise downlink radio-frequency signal amplifying circuit, frequency mixer and descending medium-frequency signal amplification circuit, said frequency mixer connects the output of said downlink radio-frequency signal amplifying circuit and the input of said descending medium-frequency signal amplification circuit;
Said upward signal amplifier is connected with said dielectric duplexer; Comprise up medium-frequency signal amplification circuit, frequency mixer and up rf signal amplification circuit, said frequency mixer connects the output of said up medium-frequency signal amplification circuit and the input of said up rf signal amplification circuit.
5. frequency-variable module as claimed in claim 4; It is characterized in that; Said rf signal amplification circuit comprises first automatic electric-level control ALC chip, first amplifier tube and first numerical control decay chip, and said first amplifier tube connects the output of a said ALC chip and the input of said first numerical control decay chip;
Said frequency mixer comprises first filter, first mixer tube and LC filter, and said first mixer tube connects the output of said first filter and the input of said LC filter;
Said descending intermediate-freuqncy signal comprises second amplifier tube.
6. frequency-variable module as claimed in claim 5 is characterized in that, said up medium-frequency signal amplification circuit comprises the 2nd ALC chip and the 3rd amplifier tube, and the output of said the 2nd ALC chip is connected with the input of said the 3rd amplifier tube;
Said up rf signal amplification circuit comprises second filter, the 4th amplifier tube, second numerical control decay chip, the 3rd filter and the 5th amplifier tube; Said the 4th amplifier tube connects the output of said second filter and the input of said second numerical control decay chip, and said the 3rd filter connects the output of said second numerical control decay chip and the input of said the 5th amplifier tube.
7. frequency-variable module as claimed in claim 1 is characterized in that said local oscillator and system clock circuit comprise the 6th amplifier tube, and the up local oscillation circuit that is connected with said the 6th amplifier tube, descending local oscillation circuit and system clock produce circuit.
8. frequency-variable module as claimed in claim 1 is characterized in that, said on/descending frequency conversion control circuit comprises microcontroller, and the memory, communication interface and the temperature sensing circuit that are connected with said microcontroller.
9. like claim 5 or 6 described frequency-variable modules, it is characterized in that, said on/descending frequency conversion control circuit connects said first numerical control decay chip and said second numerical control decay chip respectively.
10. frequency-variable module as claimed in claim 1; It is characterized in that; Said frequency-variable module also comprises power-sensing circuit, and said power-sensing circuit is connected with said downstream signal amplifier input terminal, output and the output of said upward signal amplifier respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120146242U CN202143071U (en) | 2011-05-10 | 2011-05-10 | Frequency conversion module of digital fiber repeater access terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120146242U CN202143071U (en) | 2011-05-10 | 2011-05-10 | Frequency conversion module of digital fiber repeater access terminal |
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| Publication Number | Publication Date |
|---|---|
| CN202143071U true CN202143071U (en) | 2012-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120146242U Expired - Fee Related CN202143071U (en) | 2011-05-10 | 2011-05-10 | Frequency conversion module of digital fiber repeater access terminal |
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| CN (1) | CN202143071U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103873049A (en) * | 2012-12-10 | 2014-06-18 | 北京普源精电科技有限公司 | Radio-frequency-signal measurement device and use method thereof |
| CN107749774A (en) * | 2017-10-29 | 2018-03-02 | 深圳市中安神盾科技有限公司 | A kind of wireless signal amplifier for being used to solve the high-rise interference of mobile communication |
-
2011
- 2011-05-10 CN CN201120146242U patent/CN202143071U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103873049A (en) * | 2012-12-10 | 2014-06-18 | 北京普源精电科技有限公司 | Radio-frequency-signal measurement device and use method thereof |
| CN103873049B (en) * | 2012-12-10 | 2019-01-29 | 北京普源精电科技有限公司 | Radiofrequency signal measuring device and its application method |
| CN107749774A (en) * | 2017-10-29 | 2018-03-02 | 深圳市中安神盾科技有限公司 | A kind of wireless signal amplifier for being used to solve the high-rise interference of mobile communication |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120208 Termination date: 20170510 |