CN105577965A - Low-cost adjustable OOK modulation and demodulation circuit following AISG specification - Google Patents
Low-cost adjustable OOK modulation and demodulation circuit following AISG specification Download PDFInfo
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- CN105577965A CN105577965A CN201610132442.0A CN201610132442A CN105577965A CN 105577965 A CN105577965 A CN 105577965A CN 201610132442 A CN201610132442 A CN 201610132442A CN 105577965 A CN105577965 A CN 105577965A
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
Abstract
The invention relates to a low-cost adjustable OOK modulation and demodulation circuit following AISG standards, wherein the demodulation circuit adopts an absolute value circuit with amplification and amplitude limiting functions to realize the detection of OOK signal peak value envelope, then a comparison circuit with overdrive prevention is used to obtain a demodulation signal, and the sensitivity of the demodulation circuit is adjusted by adjusting the gain of the amplification circuit and the threshold comparison voltage of the output signal of the detection circuit; the modulation circuit in the circuit adopts a gate circuit to realize the modulation of a transmitting signal on a carrier signal, obtains an OOK signal with 2.5V bias voltage through a resistance network and the gate circuit, and is finally connected with an alternating current amplification circuit. The output power of the modulation circuit is determined by the gain of the ac amplification circuit. The present invention can be used in AISG? In the OOK communication module, the method has the advantages of low cost, adjustable receiving sensitivity, wide output power adjusting range and the like.
Description
Technical field
The present invention relates to the radio-frequency apparatus such as tower amplifier (TMA) and intelligent bias device (SBT) meeting AISG protocol specification, the particularly design of the adjustable OOK modulation-demodulation circuit of a kind of low cost of AISG specification.
Background technology
AISG agreement combines communication specification between the antenna intelligent equipment of formulation and base station by the mobile communication system manufacturer of world and microwave antenna relevant manufacturers, and antenna intelligent equipment mainly comprises long-range electrical tilt antenna (RET) and tower amplifier (TMA) two kinds.Tower amplifier is used for carrying out low noise amplification to the radiofrequency signal that antenna receives.In order to reduce the decay of Received signal strength in radio frequency feed line further, improving signal receiving sensitivity, is all the bottom being directly installed on antenna, away from base station control unit.
AISG agreement specifies that physical layer that base station communicates with antenna intelligent equipment can select 485 communications or carrier frequency to be that the OOK of 2.176MHz communicates.Because tower amplifier is connected with radio frequency interface, thus all adopt OOK communication mode in tower amplifier, inner integrated OOK modulation-demodulation circuit.
Intelligent bias device, for superposing OOK signal or intercept OOK signal from radio frequency feed line on radio frequency feed line, is mainly used in realizing AISG by radio frequency feed line between base station with long-range electrical tilt antenna control unit and communicates, save AISG cable, reduce investment outlay.
The implementation method of OOK communication mode is the OOK signal that AISG communicating data signals is modulated into 2.176MHz by transmit leg, be added on radio frequency feed line, recipient demodulates AISG data-signal, send and adopt identical carrier frequency with accepting, for half duplex mode of communication, the non-equilibrium transmission mode of data link layer in corresponding HDLC agreement.OOK communication comprises modulation circuit and demodulator circuit two parts.
In current design, OOK communication adopts the integrated chip of Maxim usually, and price is more expensive, and the supply of material is unstable.Product competition is day by day fierce, and adopt the cost pressure of the scheme of integrated chip comparatively large, in tower amplifier control board, only the price of this OOK integrated chip just accounts for more than 20% of BOM cost, and in intelligent bias device, this ratio is higher.Especially for medium-sized and small enterprises, because size of order is less, the price advantage of batch production cannot be played, and it is long to there is delivery cycle, delivery date instability deficiency.Secondly, integrated chip receiving sensitivity is non-adjustable, output gain adjustment scope is narrower, in actual applications, because site environment is complicated, although the performance of this integrated IC meets AISG code requirement, but the requirement of on-the-spot application can not be adapted in practical application well, there is the unstable defect of communication when large power test especially.
Summary of the invention
The object of this invention is to provide a kind of adjustable OOK modulation-demodulation circuit of low cost following AISG specification.This modulation-demodulation circuit has two advantages relative to the scheme of integrated chip: one is with general operational amplifier for core, and replaceable model is many, and price is low, and buying is convenient; Two is because the program is made up of amplifier and resolution element, thus its receiving sensitivity and transmitting power adjustable, enhance this design adaptive capacity in actual applications.
The present invention mainly comprises demodulator circuit and modulation circuit two parts, and modulation circuit is operated in signal sendaisle, demodulator circuit work and Signal reception passage.
Demodulator circuit have employed general high speed rail-to-rail operation amplifier and forms peak envelop detection circuit, and its output signal compares with detecting valve threshold voltage and obtains AISG signal of communication, and obtains transmitting-receiving control signal by monostable circuit.The sensitivity of demodulator circuit can be regulated by the gain and detecting valve threshold voltage regulating amplifying circuit in peak envelop detection circuit.
Modulation circuit have employed the OOK signal output that active crystal oscillator, gate circuit and resistor network achieve 2.5V bias voltage, and obtains final OOK modulation signal through ac amplifier circuit, and adjustment multiplication factor can regulation output power.
Close receive path by monostable circuit in modulation signal emission process, thus prevent from transmitting and rap around in receive path.
Object of the present invention, feature and advantage will in conjunction with the embodiments, are further described with reference to accompanying drawing.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 OOK modulation-demodulation circuit overall construction drawing;
Fig. 2 OOK signal demodulating circuit;
Fig. 3 OOK signal modulation circuit.
Embodiment
Object is reached and effect is easy to understand in order to make technological means of the present invention, creation characteristic, workflow, using method, below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1 to Fig. 3, the invention provides a kind of technical scheme: described Fig. 1 is the overall construction drawing of the OOK modulation-demodulation circuit following AISG specification.In figure, module 1 is passive bandwidth-limited circuit, and centre frequency is 2.176MHz, suppresses the band of OOK signal to disturb outward, the square wave that demodulator circuit exports is filtered high order harmonic component simultaneously, obtain fundamental signal.Demodulator circuit is made up of module 2 and 3, and module 2 is accurate detecting circuit, and module 3 is comparison circuit.Module 4 is monostable circuit, receives and dispatches control signal for being obtained by Received signal strength RX, and transmitting-receiving control signal is high level during Signal reception, and no signal reception period is low level.Modulation circuit is made up of module 5 and 6, and wherein module 6 is made up of gate circuit and resistor network, and by MCU_TXD signal madulation for being biased to 2.5V, frequency is the OOK signal of 2.176MHz, and module 5 is ac amplifier circuit, realizes the adjustment to power output.7 is monostable circuit, and during MCU_TXD signal sends, the output of 7, for closing receive path, prevents MCU_TXD signal from rapping around to input.
Described Fig. 2 is OOK signal demodulating circuit figure, R49 and R44 dividing potential drop obtains the la tension de reference Uref est of reference voltage 2.5V, and Uref is as the reference potential of demodulator circuit.AISG_RF_IN is the OOK signal through band pass filter, and C51 is ac coupling capacitor, and adopt the NPO material electric capacity of high q-factor, the signal after coupling is denoted as U
i.U9-A, D4, R45 and R39 are to the negative half-cycle of OOK signal, and proportionality coefficient is-1, are 0 to its positive half period proportionality coefficient, and its output is denoted as U
o1.U9-D is the summing circuit that amplitude limit exports, and its output is denoted as U
o2, D6 is limiter diode, and the output of restriction U9-D is minimum is Uref-1.4V.When ignoring amplitude limit effect, the output expression formula of U9-D is U
o2=-14.6*U
i-43.1*U
o1, due to the restriction of amplitude limit function, its minimum voltage is Uref-1.4V, thus U
o2for OOK signal is through precision rectifying, the signal amplifying also amplitude limit.R65 and C67 constitutes U
o2the RC filtering of signal, U9-C anti-phase input terminal voltage is denoted as U-, and U-is that OOK signal is exaggerated and amplitude limit, the then filtered amplitude envelope of RC, when AISG_RF_IN port exists OOK signal, U-voltage is Uref-1.4V, and when AISG_RF_IN does not exist OOK signal, U-voltage is Uref.R59 and R54 dividing potential drop constitutes detecting valve threshold voltage, is denoted as U+, and the comparative result of U+ and U-signal is demodulation and exports RX.In figure, D12 is Schottky diode, prevents comparator input terminal from overdriving, in order to promote the speed of comparator upset.The receiving sensitivity of this circuit can be regulated by the multiplication factor and detecting valve threshold voltage regulating U9-D discharge circuit.
Described Fig. 3 is the modulation circuit in the present invention, U18-B is monostable flipflop, and the module 7, U14-C constituted in Fig. 1 is NAND gate circuit, constitute the electronic switch module 8 in Fig. 1, when MCU_TXD sends signal, the 12 pin output low levels of U8-B, Q2 conducting, 10 pin of U14-C are low level, NAND gate is closed, and now the output RX of demodulator circuit cannot pass through NAND gate, prevents MCU_TXD signal to rap around to MCU_RXD end by demodulation path.U17 is active crystal oscillator, and concussion frequency is 2.176MHz, exports as square-wave signal.U14-B is by the negate of MCU_TXD signal, idle condition MCU_TXD is high level, it is low level after negate, the carrier signal of the output of U17 cannot pass through U14-D, when MCU_TXD is when sending data, it is low level, is high level after negate, carrier signal by U14-D, thus realizes OOK signal madulation.R89, R99, R100, R102, R103, D16 and U14-A constitute signal conditioning circuit, be the OOK signal madulation of 0-5V be bias voltage are 2.5V by amplitude, and concussion amplitude is the OOK signal of 1.67V.U9-B, R60, R61, R57 and C65 constitute the ac amplifier circuit that multiplication factor is 2, and its output is connected with port AISG_RF_IN, exports, complete the modulated process of MCU_TXD to OOK signal finally by the bandwidth-limited circuit 1 in Fig. 1.Can regulation output power by the multiplication factor of adjustment U9-B amplifying circuit.
Described a kind of adjustable OOK modulation-demodulation circuit of low cost following AISG specification; when it is applied in tower amplifier; through the radiofrequency signal of lightning protection; first bandwidth-limited circuit is passed through; then be connected with AISG_RF_IN; MCU_RXD signal in the present invention is directly connected with the UART module receiving terminal of tower amplifier controller, and MCU_TXD signal is connected with the transmitting terminal of tower amplifier controller UART module.
Described a kind of adjustable OOK modulation-demodulation circuit of low cost following AISG specification, when this circuit application is in intelligent bias device, through the radiofrequency signal of lightning protection, first bandwidth-limited circuit is passed through, then be connected with AISG_RF_IN, MCU_RXD in the present invention is connected with the data input pin DI of 485 conversion chips (for SN65HVD12), MCU_TXD is connected with 485 conversion chip data output end DO, in addition MCU_RXD signal demand is by the monostable circuit identical with U18-B in Fig. 3, obtain receiving and dispatching control signal, this signal is connected with RE with DE of 485 conversion chips.
More than show and describe general principle of the present invention, principal character and advantage of the present invention, to those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (5)
1. follow the adjustable OOK modulation-demodulation circuit of low cost of AISG specification, its feature comprises modulation and demodulation two parts at described circuit: Part I comprises the detecting circuit and signal comparator circuit that adopt amplifier to form; Part II comprises modulation circuit and the ac amplifier circuit that generation 2.5V is biased OOK signal.
2. a kind of adjustable OOK modulation-demodulation circuit of low cost following AISG specification according to right 1, it is characterized in that demodulator circuit have employed have simultaneously amplify and the absolute value circuit of amplitude limit function to realize the detection of OOK signal, the threshold values comparative voltage that the adjustment of sensitivity of demodulator circuit can be outputed signal by the gain and detection changing amplifying circuit realize.
3. a kind of adjustable OOK modulation-demodulation circuit of low cost following AISG specification according to right 1, Schottky diode is adopted to prevent comparator input from overdriving, in order to promote the speed of comparator work between the input signal that it is characterized in that the comparison circuit in demodulator circuit.
4. a kind of adjustable OOK modulation-demodulation circuit of low cost following AISG specification according to right 1, is characterized in that modulation circuit adopts gate circuit and resistor network to produce the OOK modulation signal that bias voltage is 2.5V.
5. a kind of adjustable OOK modulation-demodulation circuit of low cost following AISG specification according to right 1, is characterized in that adopting monostable trigger-action circuit to realize shutdown signal during signal sends receives, and prevents sending signal and raps around to receiving terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610132442.0A CN105577965B (en) | 2016-03-10 | 2016-03-10 | Low-cost adjustable OOK modulation and demodulation circuit following AISG specification |
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| CN201610132442.0A CN105577965B (en) | 2016-03-10 | 2016-03-10 | Low-cost adjustable OOK modulation and demodulation circuit following AISG specification |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533631A (en) * | 2016-12-15 | 2017-03-22 | 中国科学院深圳先进技术研究院 | Multi-antenna decoding circuit |
| CN111226423A (en) * | 2017-10-19 | 2020-06-02 | 瑞典爱立信有限公司 | Transmitter, network node, method and computer program for transmitting binary information |
| CN112928992A (en) * | 2019-12-05 | 2021-06-08 | 京信通信技术(广州)有限公司 | OOK modulation-demodulation circuit |
| CN115603666A (en) * | 2022-11-29 | 2023-01-13 | 紫光同芯微电子有限公司（Cn） | Device and method for demodulation and demodulation equipment |
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| CN101626252A (en) * | 2009-08-11 | 2010-01-13 | 武汉凡谷电子技术股份有限公司 | AISG tower mounted amplifier OOK MODEM circuit |
| JP2013026892A (en) * | 2011-07-22 | 2013-02-04 | Hitachi Cable Ltd | Antenna control system and antenna modem |
| CN204305021U (en) * | 2015-01-13 | 2015-04-29 | 武汉凡谷电子技术股份有限公司 | The AISG tower amplifier OOK modulation-demodulation circuit that data can return |
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2016
- 2016-03-10 CN CN201610132442.0A patent/CN105577965B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257330A (en) * | 2008-03-25 | 2008-09-03 | 京信通信系统（中国）有限公司 | Feeding electric appliance embedded with modem function |
| CN101626252A (en) * | 2009-08-11 | 2010-01-13 | 武汉凡谷电子技术股份有限公司 | AISG tower mounted amplifier OOK MODEM circuit |
| JP2013026892A (en) * | 2011-07-22 | 2013-02-04 | Hitachi Cable Ltd | Antenna control system and antenna modem |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533631A (en) * | 2016-12-15 | 2017-03-22 | 中国科学院深圳先进技术研究院 | Multi-antenna decoding circuit |
| CN106533631B (en) * | 2016-12-15 | 2019-10-25 | 中国科学院深圳先进技术研究院 | Multiple antennas decoding circuit |
| CN111226423A (en) * | 2017-10-19 | 2020-06-02 | 瑞典爱立信有限公司 | Transmitter, network node, method and computer program for transmitting binary information |
| CN112928992A (en) * | 2019-12-05 | 2021-06-08 | 京信通信技术(广州)有限公司 | OOK modulation-demodulation circuit |
| CN115603666A (en) * | 2022-11-29 | 2023-01-13 | 紫光同芯微电子有限公司（Cn） | Device and method for demodulation and demodulation equipment |
| CN115603666B (en) * | 2022-11-29 | 2023-03-24 | 紫光同芯微电子有限公司 | Device and method for demodulation and demodulation equipment |
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