CN105577965B - 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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- CN105577965B CN105577965B CN201610132442.0A CN201610132442A CN105577965B CN 105577965 B CN105577965 B CN 105577965B CN 201610132442 A CN201610132442 A CN 201610132442A CN 105577965 B CN105577965 B CN 105577965B
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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
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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 invention can be used in AISG OOK communication modules in radio frequency equipment such as Tower Mounted Amplifiers (TMA) and intelligent bias devices (SBT), and 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 tower amplifiers (TMA) and intelligent bias device that meet AISG protocol specifications（SBT）Equal radio frequencies are set
It is standby, more particularly to the design scheme of the adjustable OOK modulation-demodulation circuits of low cost of a kind of AISG specifications.
Background technology
AISG agreements are the days formulated by the mobile communication system manufacturer of world and microwave antenna relevant manufacturers joint
Communication specification between line intelligent equipment and base station, antenna intelligent equipment include mainly remotely electricity tune antenna（RET）And tower
Push up amplifier（TMA）Two kinds.Tower amplifier is used to carry out low noise amplification to the radiofrequency signal that antenna receives.In order into one
Step reduces the decaying for receiving signal in radio frequency feed line, improves signal receiving sensitivity, is all the bottom end for being directly installed on antenna,
Far from base station control unit.
AISG agreements provide that the physical layer that base station is communicated with antenna intelligent equipment can select 485 communications or carrier frequency
It is communicated for the OOK of 2.176MHz.Since tower amplifier is connected with radio frequency interface, thus it is all logical using OOK in tower amplifier
Letter mode is internally integrated OOK modulation-demodulation circuits.
Intelligent bias device is used to be superimposed OOK signals on radio frequency feed line or intercepts OOK signals from radio frequency feed line, is mainly used for
It realizes that AISG is communicated by radio frequency feed line between base station and remotely electricity tune antenna control unit, saves AISG cables, save and throw
Money.
The implementation method of OOK communication modes is the OOK letters that AISG communicating data signals are modulated into 2.176MHz by sender
Number, it is added on radio frequency feed line, recipient demodulates AISG data-signals, sends and receives to use identical carrier frequency, is
Half duplex mode of communication corresponds to the non-equilibrium transmission mode of data link layer in HDLC protocol.OOK communications include modulation circuit with
Demodulator circuit two parts.
In current design, OOK communicates the integrated chip of generally use Maxim, expensive, and it is unstable to supply
It is fixed.Product competition is increasingly fierce, and the cost pressure using the scheme of integrated chip is larger, single in tower amplifier control panel
The price of the single grain OOK integrated chips just accounts for 20% or more of BOM costs, in intelligent bias device, this ratio higher.Especially
It is for medium-sized and small enterprises, since size of order is smaller, can not play the price advantage of batch production, and that there are delivery cycles is long,
Delivery date unstable deficiency.Secondly, integrated chip receiving sensitivity is non-adjustable, output gain adjustment range is relatively narrow, is actually answering
In, because although the performance of site environment complexity, the integrated IC meets AISG code requirements, but in practical application simultaneously
It cannot be well adapted for the requirement of field application, especially in large power test in the presence of the defect that communication is unstable.
Invention content
The object of the present invention is to provide a kind of adjustable OOK modulation-demodulation circuits of low cost following AISG specifications.The tune
Demodulator circuit processed relative to integrated chip scheme tool there are two advantage：First, using general operational amplifier as core, can replace
The number of remodeling is more, and price is low, and buying is convenient；Second is that since the program is made of amplifier and resolution element, thus its receiving sensitivity
It is adjustable with transmission power, enhance the adaptability of the design scheme in practical applications.
The invention mainly comprises demodulator circuit and modulation circuit two parts, modulation circuit is operated in signal sendaisle, solution
Adjust circuit work and signal receiving channel.
Demodulator circuit uses general high speed rail-to-rail operation amplifier and constitutes peak envelop detection circuit, output
Signal relatively obtains AISG signals of communication with detection threshold voltage, and obtains transmitting-receiving control signal by monostable circuit.Pass through
The sensitivity of demodulator circuit can be adjusted by adjusting the gain of amplifying circuit and detection threshold voltage in peak envelop detection circuit.
Modulation circuit use source crystal oscillator, gate circuit and resistor network realize 2.5V bias voltages OOK signals it is defeated
Go out, and final OOK modulated signals are obtained by ac amplifier circuit, output power can be adjusted by adjusting amplification factor.
Receiving channel is closed by monostable circuit in modulated signal emission process, is connect to prevent transmitting signal from rapping around to
It receives in channel.
The purpose of the present invention, feature and advantage will be further described with reference to attached drawing in conjunction with the embodiments.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 OOK modulation-demodulation circuit overall construction drawings；
Fig. 2 OOK signal demodulating circuits；
Fig. 3 OOK signal modulation circuits.
Specific implementation mode
In order to make technological means, creation characteristic, workflow, application method reached purpose and effect of the present invention be easy to bright
White to understand, below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
It please refers to Fig.1 to Fig.3, the present invention provides a kind of technical solution：Described Fig. 1 is the OOK modulation for following AISG specifications
The overall construction drawing of demodulator circuit.Module 1 is passive bandwidth-limited circuit in figure, and centre frequency 2.176MHz inhibits OOK letters
Number out-of-band interference, while by demodulator circuit export square wave filter higher hamonic wave, obtain fundamental signal.Demodulator circuit is by module
2 and 3 compositions, module 2 are accurate detecting circuit, and module 3 is comparison circuit.Module 4 is monostable circuit, for by reception signal
RX obtains transmitting-receiving control signal, and transmitting-receiving control signal is high level in signal reception period, and no signal reception period is low level.
Modulation circuit is made of module 5 and 6, and wherein module 6 is made of gate circuit and resistor network, is inclined by MCU_TXD signal modulations
It is set to 2.5V, frequency is the OOK signals of 2.176MHz, and module 5 is ac amplifier circuit, realizes the adjusting to output power.7 are
Monostable circuit, during MCU_TXD signals are sent, 7 output prevents MCU_TXD signal wraparounds for closing receiving channel
To input terminal.
Described Fig. 2 is OOK signal demodulating circuit figures, and R49 and R44 divide to obtain the reference voltage of reference voltage 2.5V
The reference potential of Uref, Uref as demodulator circuit.AISG_RF_IN is the OOK signals by bandpass filter, and C51 is exchange
Coupled capacitor, using the NPO material capacitances of high q-factor, the signal after coupling is denoted as Ui.U9-A, D4, R45 and R39 are to OOK signals
Negative half-cycle, proportionality coefficient be -1, to its positive half period proportionality coefficient be 0, output be denoted as UO1.U9-D is amplitude limit output
Summing circuit, output are denoted as UO2, D6 is limiter diode, limits the minimum Uref-1.4V of output of U9-D.Ignore amplitude limit work
In the case of, the output expression formula of U9-D is UO2=-14.6*Ui-43.1*UO1, due to the limitation of amplitude limit function, minimum electricity
It is Uref-1.4V to press, thus UO2It is the signal that OOK signals pass through precision rectifying, amplification and amplitude limit.R65 and C67 is constituted pair
UO2The RC of signal is filtered, and U9-C anti-phase input terminal voltages are denoted as U-, and U- is that OOK signals are amplified simultaneously amplitude limit, then after RC filtering
Amplitude envelope, when the ports AISG_RF_IN there are U- voltages when OOK signals be Uref-1.4V, when AISG_RF_IN is not present
U- voltages are Uref when OOK signals.R59 and R54 partial pressures constitute detection threshold voltage, are denoted as U+, the comparison of U+ and U- signals
As a result it is demodulation output RX.D12 is Schottky diode in figure, prevents comparator input terminal from overdriving, compares to be promoted
The speed of device overturning.The reception of this circuit can be adjusted by the amplification factor and detection threshold voltage that adjust U9-D operational amplifier circuits
Sensitivity.
Described Fig. 3 is the modulation circuit in the present invention, and U18-B is monostable flipflop, constitutes the module 7 in Fig. 1,
U14-C is NAND gate circuit, constitutes the electronic switch module 8 in Fig. 1, and when MCU_TXD sends signal, 12 feet of U8-B are defeated
Go out low level, 10 feet of Q2 conductings, U14-C are low level, and NAND gate is closed, at this time the output RX of demodulator circuit can not by with
NOT gate, it is therefore prevented that MCU_TXD signals rap around to the ends MCU_RXD by demodulating access.U17 is to have source crystal oscillator, and concussion frequency is
2.176MHz exports as square-wave signal.U14-B negates MCU_TXD signals, and idle state MCU_TXD is high level, after negating
For low level, the carrier signal of the output of U17 can not by U14-D, when MCU_TXD when sending data, be low level, take
It is high level after anti-, carrier signal is by U14-D, to realize OOK signal modulations.R89,R99,R100,R102,R103,D16
Signal conditioning circuit is constituted with U14-A, by the OOK signal modulations that amplitude is 0-5V be bias voltage is 2.5V, shakes amplitude
For the OOK signals of 1.67V.U9-B, R60, R61, R57 and C65 constitute the ac amplifier circuit that amplification factor is 2, output
It is connected with port AISG_RF_IN, is exported finally by the bandwidth-limited circuit 1 in Fig. 1, completes MCU_TXD to OOK signals
Modulated process.Amplification factor by adjusting U9-B amplifying circuits can adjust output power.
A kind of adjustable OOK modulation-demodulation circuits of low cost following AISG specifications, when it amplifies applied to tower top
When in device, by the radiofrequency signal of lightning protection, first by bandwidth-limited circuit, then it is connected with AISG_RF_IN, this hair
MCU_RXD signals in bright are directly connected with the UART module receiving terminals of tower amplifier controller, MCU_TXD signals and tower top
The transmitting terminal of amplifier controller UART modules is connected.
A kind of adjustable OOK modulation-demodulation circuits of low cost following AISG specifications, when the circuit is applied to intelligence
When bias device, by the radiofrequency signal of lightning protection, first by bandwidth-limited circuit, then it is connected with AISG_RF_IN, this
MCU_RXD in invention and 485 conversion chips（By taking SN65HVD12 as an example）Data input pin DI be connected, MCU_TXD and 485
Conversion chip data output end DO is connected, and MCU_RXD signals are needed through monostable circuit identical with U18-B in Fig. 3 in addition,
Transmitting-receiving control signal is obtained, which is connected with the RE of 485 conversion chips and DE.
The basic principle of the present invention, main feature and advantages of the present invention has been shown and described above, for this field skill
For art personnel, it is clear that invention is not limited to the details of the above exemplary embodiments, and without departing substantially from the present invention spirit or
In the case of essential characteristic, the present invention can be realized in other specific forms.Therefore, in all respects, should all incite somebody to action
Embodiment regards exemplary as, and is non-limiting, the scope of the present invention by appended claims rather than on state
Bright restriction, it is intended that including all changes that come within the meaning and range of equivalency of the claims in the present invention
It is interior.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiment being appreciated that.
Claims (1)
1. a kind of adjustable OOK modulation-demodulation circuits of low cost following AISG specifications, feature includes modulation in the circuit
With two parts of demodulation：First part includes the detecting circuit and signal comparator circuit constituted using amplifier；Second part includes
Generate the modulation circuit and ac amplifier circuit of 2.5V biasing OOK signals；
Demodulator circuit uses while having the absolute value circuit of amplification and amplitude limit function to realize the detection of OOK signals, demodulates
The adjustment of sensitivity of circuit is realized by changing the gain of amplifying circuit and the threshold values comparison voltage of detection output signal；
It prevents comparator input from overdriving using Schottky diode between the input signal of comparison circuit in demodulator circuit, uses
To promote the speed of comparator work；
The modulation circuit uses gate circuit and resistor network to generate bias voltage as the OOK modulated signals of 2.5V；
Realize that shutdown signal receives during signal transmission, prevents transmission signal from rapping around to receiving terminal using monostable circuit；
In the OOK signal demodulating circuits, reference potentials of the setting Uref as demodulator circuit；AISG_RF_IN is by band logical
The OOK signals of filter, the signal after coupling are denoted as Ui；The negative half-cycle output of OOK signals is denoted as UO1；Amplitude limit output is asked
Output with circuit U 9-D is denoted as UO2；The minimum Uref-1.4V of output of the summing circuit U9-D of amplitude limit output；
In the case of ignoring amplitude limit effect, the output expression formula of the summing circuit U9-D of amplitude limit output is：
UO2 =-14.6*Ui -43.1*UO1；
The receiving sensitivity of this circuit is adjusted by the amplification factor and detection threshold voltage that adjust U9-D operational amplifier circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN105577965A CN105577965A (en) | 2016-05-11 |
| CN105577965B true CN105577965B (en) | 2018-11-02 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| BR112020007601A2 (en) * | 2017-10-19 | 2020-09-29 | Telefonaktiebolaget Lm Ericsson (Publ) | transmitter, network node, method and computer program to transmit 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 |
| 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 |
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 |
| 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 |
| 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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Granted publication date: 20181102 |