CN204721338U - The analog front circuit of a kind of OFDM power line carrier and GFSK wireless double mode communication control processor - Google Patents
The analog front circuit of a kind of OFDM power line carrier and GFSK wireless double mode communication control processor Download PDFInfo
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- CN204721338U CN204721338U CN201520159247.8U CN201520159247U CN204721338U CN 204721338 U CN204721338 U CN 204721338U CN 201520159247 U CN201520159247 U CN 201520159247U CN 204721338 U CN204721338 U CN 204721338U
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Abstract
The utility model discloses the analog front circuit of a kind of OFDM power line carrier and GFSK wireless double mode communication control processor.Comprise: low noise amplifier, frequency mixer, phase-locked loop, automatic gain amplifier, energy detection unit, tunable filter, variable gain amplifier, energy detection unit, gain control unit, analog to digital converter, dynamic range hoisting module, detecting signal unit.Low noise amplifier and frequency mixer is adopted to carry out amplification and the down-conversion of wireless signal, automatic gain amplifier, variable gain amplifier, tunable filter, energy detection unit, second energy detection unit, gain control unit and analog to digital converter carry out the signal transacting of power line and wireless signal, detecting signal unit detects ofdm signal and GFSK signal, when ofdm signal and GFSK signal to be detected simultaneously, dynamic range hoisting module can improve the dynamic range of analog front circuit, thus can process OFDM and GFSK signal simultaneously.
Description
Technical field
The utility model relates to dual mode communication circuit, particularly the analog front circuit of a kind of OFDM power line carrier and GFSK dual mode communication receiver.
Background technology
Internet of Things application branch---in the field such as power information collection, the management of municipal light, building energy efficiency management, Smart Home, what mainly adopt is adopt traditional Single mode communication mode, and mainstream technology mainly contains power line communication and micro power radio communication.
Power line communication utilizes existing power line transmission data, and it utilizes low-voltage power line power distribution network to carry out carrier communication, with low cost, one of major way becoming intelligent meter data recording.In power line carrier communication, in order to obtain higher speed and the interference of anti-arrowband, adopt orthogonal frequency division multiplexi (OFDM).OFDM is divided into several parallel data streams information, then Data Modulation is transmitted to mutually orthogonal single sub-carrier.OFDM reduces intersymbol interference, improves the availability of frequency spectrum, has effectively resisted arrowband interference.
But power line has a lot of characteristic as communication media: time variation is strong, equiva lent impedance transformation range is large, and fading channel is large, interference and noise strong etc.Along with the continuous increase of power consumption equipment kind, various frequency conversion electrical equipment and high-power electric appliance use more and more, and OFDM carrier communication in some conditions cannot proper communication, especially heavy or under disturbing strong condition in load.
Micro power radio communication adopts the modulation system of GFSK, owing to adopting wireless channel as communication media, it is not by the impact of the various non-ideal factors of power line, in various load heavy and under disturbing strong environment communication efficiency fine, but this communication mode is more responsive for wireless shielding, especially the place that iron sheet table case is many with some building walls, cannot proper communication.
Comprehensive above-mentioned situation, needs a kind ofly can both stablize the telecommunication circuit with reliable communication under various conditions.
Summary of the invention
For the problems referred to above, the utility model provides the analog front circuit of a kind of OFDM power line carrier and GFSK wireless double mode communication control processor.
To achieve these goals, the technical solution of the utility model is: the analog front circuit of a kind of OFDM power line carrier and GFSK wireless double mode communication control processor, comprises low noise amplifier unit, mixer unit, phase locked-loop unit, automatic gain amplifier, energy detection unit, tunable filter unit, adjustable gain amplifying unit, the second energy detection unit, gain control unit, AD conversion unit, detecting signal unit and dynamic range hoisting module.
AD conversion unit comprises two 2 rank SD modulators and noise cancellation logics, the output of first 2 rank SD modulator connects input and the noise cancellation logic of second 2 rank SD modulator respectively, the output of second 2 rank SD modulator connects noise cancellation logic, can offset the exponent number that logic controls modulator by control noises.
Dynamic range hoisting module comprises LDO unit, bias current generation unit and control logic.
The utility model can promote the ability of processing of circuit signal by dynamic range hoisting module according to the situation of signal, thus provides a kind of analog front circuit, can process ofdm signal and GFSK signal simultaneously.Can be applied in the dual-mode communication system of power line carrier and radio communication.
Accompanying drawing explanation
Fig. 1 is the system block diagram that the utility model is implemented.
Fig. 2 is the automatic gain amplifier of the utility model enforcement and the structure chart of energy detection unit.
Fig. 3 is the structure chart of the variable band-pass filter that the utility model is implemented.
Fig. 4 is the adjustable gain amplifying unit that the utility model is implemented, the structure chart of the second energy detection unit and gain control unit.
Fig. 5 is the structure chart of the analog to digital converter that the utility model is implemented.
Fig. 6 is the structure chart of the dynamic range lift unit that the utility model is implemented.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further
The circuit block diagram that the utility model is implemented is as Fig. 1.Shown low noise amplifier unit 101, mixer unit 102, phase locked-loop unit 103, automatic gain amplifying unit 104, energy detection unit 105, variable band-pass filter 106, variable gain amplifier 107, AD conversion unit 108, dynamic range lift unit 109, detecting signal unit 110, energy detection unit 112, gain control unit 111.Low noise amplifier exports 101 and is connected with frequency mixer 102, the output of phase-locked loop 103 is connected with the input of frequency mixer 102, the output of frequency mixer 102 is connected with the input of automatic gain amplifier 104, and the output of automatic gain amplifier 104 is connected with the input of energy detection unit 105 and variable band-pass filter unit 106 respectively; The output of energy detection unit 105 is connected with the control end of automatic gain control unit 104; The output of variable band-pass filter unit 106 is connected with the input of adjustable gain amplifying unit 107; The output of adjustable gain amplifying unit 107 is connected with the input of energy detection unit 112 and AD conversion unit 108 respectively; The output of energy detection unit 112 is connected with the input of gain control unit 111; The output of gain control unit 111 is connected with the gain control end of adjustable gain amplifying unit 107, analog to digital converter 108 is connected with the input of detecting signal unit 110, the output of detecting signal unit 110 is connected with the input of dynamic range lift unit 109, and the output of dynamic range lift unit 109 is connected with the control end of AD conversion unit 108 with variable band-pass filter unit 106, adjustable gain amplifying unit 107 respectively.
As Fig. 2, automatic gain amplifying unit adopts resistance and amplifier OP1 to realize gain-adjusted, wherein input by two paths of signals, be respectively IN1 and IN2, IN1 is differential signal, contact resistance R1A and R1B respectively, IN2 is differential signal, contact resistance R2A and R2B respectively, resistance R1A, R1B and R2A, R1B is fixed resistance value, the electric resistance array that resistance R13 and R14 adopts 5 digit numeric codes to control realizes,-10dB to 21dB can be realized by regulable control A<4:0>, step-length 1dB, totally 32 yield values, the mitigation and amplification of input signal can be realized, wherein amplifier adopts the amplifier that equivalent input noise is lower, ensure the low-noise characteristic of the first adjustable gain amplifying unit entirety.
Adopt as shown in E1 in Fig. 2 root mean square energy detection unit to output signal square and integration, then the signal energy value of the result extracted square root, namely the output energy of ofdm signal can be detected accurately, also can detect the output energy of GFSK signal, OFDM and GFSK signal be existed simultaneously and also can be suitable for.
Testing result is converted to gain control code by the AD conversion unit ADC1 in such as Fig. 2, and the first adjustable gain amplifying unit increases according to gain control code or reduces signal, and signal is adjusted to suitable target.When input only has a kind of signal, automatically regulate gain according to signal magnitude.When OFDM and GFSK signal all exists, for ofdm signal is comparatively large, GFSK signal is less or ofdm signal is less and GFSK signal is comparatively large or ofdm signal and GFSK signal all larger, automatic reduction gain, prevents the serious nonlinear distortion of output signal even saturated thus the signal to noise ratio of extra; When OFDM and GFSK signal is all less, increases gain, promote the performance of whole receiving path.
As Fig. 3, variable band-pass filter unit adopts the structure of active RC filter, and wherein resistance and electric capacity adopt variable resistance and capacitor array, are realized the selection of different frequency bands signal by frequency band adjustment unit, can adapt to different application requirements.When there is very strong band and disturbing outward, by reduce band outer interference signal, reduce the peak-to-peak value of signal, while operating voltage and bias current adjustable, by improving operating voltage and its large-signal disposal ability of bias current boost, thus the dynamic range of circuit can be promoted.
As Fig. 4, adjustable gain amplifying unit adopts resistance and amplifier OP2 to realize gain-adjusted, wherein input resistance R41 and R42 adopts fixed resistance value, the electric resistance array that resistance R43 and R44 adopts 6 digit numeric codes to control realizes, 0dB to 63dB can be realized by regulable control B<5:0>, step-length 1dB, totally 64 yield values, maximumly the signal of several millivolts can be amplified to several volts, for so high gain ranging, in order to prevent as the non-ideal factors such as imbalance cause circuit normally to work, add imbalance and eliminate unit, simultaneously operating voltage and bias current adjustable, can by improving operating voltage and its large-signal disposal ability of bias current boost, thus promote the dynamic range of circuit.
Energy detection unit adopts root mean square energy measuring, as the E2 in Fig. 4, testing result is converted to gain control code by the AD conversion unit ADC2 in such as Fig. 4, and signal, according to gain control code adjustment signal, is adjusted to the input reference signal of AD conversion unit by adjustable gain amplifying unit.
As Fig. 5, analog to digital converter adopts the analog to digital converter of sigma delta structure, adopts the single ring architecture cascade of two-stage 2 rank, exponent number can configure, and when being configured to 2 stage structure, exports the digital signal of 12, when being configured to 4 rank, exporting 16 is digital signal.
As Fig. 6, dynamic range lift unit adopts linear stable to produce the operating voltage producing tunable filter and variable gain amplifier respectively, bias current generating circuit is adopted to produce the bias current of tunable filter and variable gain amplifier respectively, control logic is adopted to produce the exponent number control signal of analog to digital converter, be 1.8V and 3.3V according to input signal output services voltage, bias current is 1 times of reference current and 2 times of reference currents, and it is 2 rank and 4 rank that the exponent number control signal of modulus analog to digital converter can control it.
Adopt single analog intermediate frequency signal treatment channel, receiving circuit overall gain scope reaches-10dB to 84dB, provides the total gain ranging up to 95dB, can fully tackle power line high attenuation or long-distance transmissions.When detecting signal unit detects ofdm signal and GFSK signal simultaneously, input high level is to dynamic range lift unit, dynamic lift unit is respectively tunable filter and variable gain amplifier provides the operating voltage of 3.3V and the operating current of 2 times, control analog to digital converter and be operated in 4 rank patterns, export the digital signal of 16, thus ensure that serious nonlinear distortion is not occurring for ofdm signal and GFSK signal, provide enough signal to noise ratios, for the digital demodulation of ofdm signal and GFSK signal provides condition.
Claims (3)
1. the analog front circuit of an OFDM power line carrier and GFSK wireless double mode communication control processor, it is characterized in that: comprise low noise amplifier unit, mixer unit, phase locked-loop unit, automatic gain amplifier, energy detection unit, tunable filter unit, adjustable gain amplifying unit, second energy detection unit, gain control unit, AD conversion unit, detecting signal unit and dynamic range hoisting module.
2. the analog front circuit of a kind of OFDM power line carrier as claimed in claim 1 and GFSK wireless double mode communication control processor, it is characterized in that: described AD conversion unit comprises two 2 rank SD modulators and noise cancellation logics, the output of first 2 rank SD modulator connects input and the noise cancellation logic of second 2 rank SD modulator respectively, the output of second 2 rank SD modulator connects noise cancellation logic, can offset the exponent number that logic controls modulator by control noises.
3. the analog front circuit of a kind of OFDM power line carrier as claimed in claim 1 and GFSK wireless double mode communication control processor, is characterized in that: described dynamic range hoisting module comprises LDO unit, bias current generation unit and control logic.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520159247.8U CN204721338U (en) | 2015-03-20 | 2015-03-20 | The analog front circuit of a kind of OFDM power line carrier and GFSK wireless double mode communication control processor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520159247.8U CN204721338U (en) | 2015-03-20 | 2015-03-20 | The analog front circuit of a kind of OFDM power line carrier and GFSK wireless double mode communication control processor |
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| CN204721338U true CN204721338U (en) | 2015-10-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112367101A (en) * | 2020-12-09 | 2021-02-12 | 核工业理化工程研究院 | Analog front-end circuit suitable for narrow-band power line communication |
| CN114650075A (en) * | 2022-02-21 | 2022-06-21 | 南京英锐创电子科技有限公司 | Data transmitting/receiving system, data receiving apparatus, and control method thereof |
| CN116318212A (en) * | 2023-01-09 | 2023-06-23 | 中国电子科技集团公司第十研究所 | Automatic gain control circuit and control method for ultrashort wave radio station |
-
2015
- 2015-03-20 CN CN201520159247.8U patent/CN204721338U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112367101A (en) * | 2020-12-09 | 2021-02-12 | 核工业理化工程研究院 | Analog front-end circuit suitable for narrow-band power line communication |
| CN114650075A (en) * | 2022-02-21 | 2022-06-21 | 南京英锐创电子科技有限公司 | Data transmitting/receiving system, data receiving apparatus, and control method thereof |
| CN114650075B (en) * | 2022-02-21 | 2023-11-03 | 南京英锐创电子科技有限公司 | Data transmitting/receiving system, data receiving apparatus, and control method thereof |
| CN116318212A (en) * | 2023-01-09 | 2023-06-23 | 中国电子科技集团公司第十研究所 | Automatic gain control circuit and control method for ultrashort wave radio station |
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Address after: Yongning road in Jiangning District of Nanjing City, Jiangsu Province, No. 9 211100 Patentee after: Nanjing Nengrui Automation Equipment Co., Ltd. Address before: Yao street in Qixia District of Nanjing City, Jiangsu province 210000 Gan Jia No. 108 east side Patentee before: Nanjing Nengrui Automation Equipment Co., Ltd. |