CN204069031U - A kind of induction wireless communication high speed demodulator of low cost - Google Patents
A kind of induction wireless communication high speed demodulator of low cost Download PDFInfo
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- CN204069031U CN204069031U CN201420312966.4U CN201420312966U CN204069031U CN 204069031 U CN204069031 U CN 204069031U CN 201420312966 U CN201420312966 U CN 201420312966U CN 204069031 U CN204069031 U CN 204069031U
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Abstract
The utility model relates to the induction wireless communication high speed demodulator of inductive wireless technology, and it comprises signal amplification circuit filter module, signal transformation circuit module and digital phase detection circuit module and connector; Wherein: described connector is connected with signal amplification circuit filter module, signal amplification circuit filter module is connected with signal transformation circuit module through resistance R1 and potentiometer WR1, signal transformation circuit module is connected with digital phase detection circuit module through resistance R2, and the data output end of digital phase detection circuit module is connected with connector.Described digital phase detection circuit module forms by pierce circuit with based on the digital test.phase sequence circuit of CPLD chip design.It is simple that the utility model has circuit structure, is easy to realize carrier frequency and changes, be specially adapted to Digital Realization, can realize the simplification that carrier frequency changes, also can realize the microminaturization of induction wireless communication device, economical, reliable.
Description
Technical field
The utility model relates to inductive wireless technology, refers in particular to car---the ground communication apparatus that a kind of Large-scale Mobile locomotive automation field based on inductive wireless technology is applied.
Background technology
Inductive wireless technology (INDUCTION RADIO) is developed for the automation of the medium-and-large-sized mechanically moving of industrial production, not only has very high reliability and antijamming capability but also have both location and car because of it---ground communication function and be widely used in the Automated condtrol of four-cart and dock, mine car etc.
At present in induction wireless mechanics of communication, also there is obvious defect, main manifestations in the following areas:
1, due to the impact of distributed constant on detection and localization precision will be taken into account, and in order to ensure antijamming capability, its carrier frequency and signal bandwidth are all subject to certain restrictions, general carrier frequency is all at below 100KHZ, make traditional FSK (Frequeney-Shift Keying, frequency shift keying) demodulator circuit communication speed is limited in 2400-4800bps, and can not adapt to automaticity and improve required communication need further.
2, traditional induction wireless Fsk demodulator adopts " integrated circuit XR2211+multiplier+low-pass filtering " patten's design, and not only element is many, cost is higher, complex circuit but also to change carrier frequency very difficult.Especially integrated circuit XR2211 etc. belong to stopping production obsolescent product, seriously constrain the sustainability of such mechanics of communication.
Summary of the invention
In order to overcome above-mentioned deficiency, the utility model provides a kind of based on CPLD(Complex Programmable Logic Device) induction wireless communication demodulating equipment.The reliable communicating that this device circuit is simple, can realize 2400bps to 9600bps under induction wireless carrier frequency (49-98) KHZ, narrow bandwidth (6-10) KHZ.
The utility model mainly solve low frequency carrier wave, compared with narrow bandwidth condition under realize the reliable communicating problem of 2400bps to 9600bps.
The technical solution of the utility model is: the induction wireless communication high speed demodulator constructing a kind of low cost, and it comprises signal amplification circuit filter module, signal transformation circuit module and digital phase detection circuit module and connector; Wherein:
Described connector is connected with signal amplification circuit filter module, signal amplification circuit filter module is connected with signal transformation circuit module through resistance R1 and potentiometer WR1, signal transformation circuit module is connected with digital phase detection circuit module through resistance R2, and the data output end of digital phase detection circuit module is connected with connector.
Described digital phase detection circuit module forms by pierce circuit with based on the digital test.phase sequence circuit of CPLD chip design.
The utility model, based on CPLD chip, utilizes stratification, modular design method, implementation method---the phase-detection method of a kind of FSK modulator-demodulator designed.The block diagram of this demodulation method as shown in Figure 4.He utilizes signal waveform to carry out measured signal frequency at the phase difference with local oscillator fundamental frequency.The modulation signal of input through amplifications, filtering, relatively after become rectangular wave pulse (DAT_IN), each rectangular pulse obtains in advance (UP), delayed (DN) and homophase three kinds of comparison signals through digital test.phase sequence circuit (Phasic Detector) again together with local oscillator fundamental frequency.This comparison signal via pulse addition and subtraction circuit PI-PD for finely tuning local oscillation signal frequency to ensure the signal bandwidth of phase-detection.When advanced (UP) or delayed (DN) width exceed setting plus-minus umber of pulse time, just export as decoded digital, so just code element " 1 " and " 0 " in phase place---frequency makes a distinction, recovers digital baseband signal.
It is simple that the utility model has circuit structure, is easy to realize carrier frequency and changes, be specially adapted to Digital Realization, can realize the simplification that carrier frequency changes, also can realize the microminaturization of induction wireless communication device, economical, reliable.
Accompanying drawing explanation
Fig. 1 is demodulator electricity principle composition diagram.
Fig. 2 is signal filter circuit module electrical schematic diagram.
Fig. 3 is digital phase detection circuit module electrical schematic diagram.
Fig. 4 is digital phase detection circuit module electricity theory diagram.
Description of reference numerals
A1: digital phase detection circuit module;
A2: signal amplification circuit filter module;
A3: signal transformation circuit module;
J1: the connector of demodulator and mainboard;
DAT_IN: reshaping signal inputs;
VIN1, VIN2: be respectively two-way orthogonal signalling;
VOUT: amplified filtered signal;
PU: reshaping signal;
FIN: local oscillation signal;
DAT: data after demodulating signal exports.
Specific embodiments
Below in conjunction with example and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
As shown in figure, the utility model is made up of conventional oscillating circuit, operational amplifier, comparator, CPLD chip, resistance, electric capacity etc., and it comprises signal filter circuit modules A 2, signal transformation circuit modules A 3 and digital phase detection circuit module A1.Signal filter circuit is connected with signal transformation circuit through R1, WR1, and signal transformation circuit is connected with digital phase detection circuit through R2.
From the two-way orthogonal signalling (VIN1 of connector (J1), VIN2) with the input (VIN1 of signal amplification circuit filter module (A2), VIN2) be connected, (VOUT) output (V2) pin of signal amplification circuit filter module (A2) is connected with (3) pin of signal transformation circuit module (A3) through resistance R1 and potentiometer WR1, (PU) output 7 pin of signal transformation circuit module (A3) is connected with (DAT_IN) data input pin (PU) pin of digital phase detection circuit module (A1) through resistance R2, the pin (DAT) of the DAT data output end of digital phase detection circuit module (A1) is connected with (DAT) of connector (J1).
The filtering and amplifying circuit module (A2) of the induction wireless communication high speed demodulator of described low cost is made up of dual operational amplifier (U1A, U1B) and resistance capacitance.As shown in Figure 2, the two-way centre frequency of coming in from connector is that the orthogonal signalling (VIN1, VIN2) of 79Khz carry out filter and amplification from the output of (VOUT) end after amplifier LM4558 limited range enlargement.
3 pin of described signal transformation circuit module (A3) are connected with the V2 pin of filtering and amplifying circuit module (A2) by resistance R1 and potentiometer WR1, and the sine wave signal after amplification filtering compares output rectangular pulse signal through shaping.
Described digital phase detection module (A1) is made up of the resistance capacitance etc. of oscillator, CPLD chip and minority, as shown in Figure 3, form oscillating circuit generation local oscillation signal (FIN) by integrated chip (U2) inverter 74LS04, crystal oscillator XT1, resistance capacitance to be connected with 11 pin of CPLD chip (U3).CPLD chip (U3) completes phase locked looped function, comprise the unit such as phase-detection, pulse plus-minus, frequency division, data acquisition, signal shaping, data decode output, as shown in Figure IV, the rectangular wave pulse (DAT_IN) of 43 pin inputs of CPLD chip (U3) obtains advanced (UP), delayed (DN) and homophase three kinds of comparison signals through digital test.phase sequence circuit (Phasic Detector) together with local oscillator fundamental frequency.This comparison signal for finely tuning local oscillation signal frequency to ensure the signal bandwidth of phase-detection, realizes the reliable communicating of 2400bps to 9600bps via pulse addition and subtraction circuit PI-PD.When advanced (UP) or delayed (DN) width exceed setting plus-minus umber of pulse time, just export as decoded digital, exported by 39 pin (DAT) of CPLD chip (U3), (DAT) output is connected with (DAT) of connector (J1), so just code element " 1 " and " 0 " in phase place---frequency makes a distinction, recovers digital baseband signal.
Above-described embodiment is the utility model better embodiment; but execution mode of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (5)
1. an induction wireless communication high speed demodulator for low cost, is characterized in that this demodulator comprises signal amplification circuit filter module, signal transformation circuit module and digital phase detection circuit module and connector; Wherein:
Described connector is connected with signal amplification circuit filter module, signal amplification circuit filter module is connected with signal transformation circuit module through resistance R1 and potentiometer WR1, signal transformation circuit module is connected with digital phase detection circuit module through resistance R2, and the data output end of digital phase detection circuit module is connected with connector;
Described digital phase detection circuit module forms by pierce circuit with based on the digital test.phase sequence circuit of CPLD chip design.
2. the induction wireless communication high speed demodulator of a kind of low cost according to claim 1, is characterized in that described CPLD circuit is made up of digital test.phase sequence circuit, plus-minus impulse circuit, frequency divider, data acquisition circuit; Wherein:
The input rectangular wave pulse of described CPLD circuit together with local oscillator fundamental frequency through digital test.phase sequence circuit comparison signal phase place, be connected via pulse addition and subtraction circuit and data acquisition circuit, be respectively used to finely tune local oscillation signal frequency export with the signal bandwidth and data that ensure phase-detection, pulse addition and subtraction circuit exports local oscillator fundamental frequency signal and is connected with digital test.phase sequence circuit, the input of local oscillator clock be respectively add and subtract impulse circuit clock signal is provided and after frequency divider frequency division for data acquisition finishing circuit provides clock signal.
3. the induction wireless communication high speed demodulator of a kind of low cost according to claim 1, it is characterized in that described signal amplification circuit filter module is by dual operational amplifier U1A, U1B and resistance capacitance composition, and after amplifier LM4558 limited range enlargement, carry out filter and amplification from the output of VOUT end from orthogonal signalling VIN1, VIN2 that the two-way centre frequency that connector is come in is 79Khz.
4. the induction wireless communication high speed demodulator of a kind of low cost according to claim 1, it is characterized in that 3 pin of described signal transformation circuit module are connected with the V2 pin of signal amplification circuit filter module by resistance R1 and potentiometer WR1, the sine wave signal after amplification filtering compares output rectangular pulse signal through shaping.
5. the induction wireless communication high speed demodulator of a kind of low cost according to claim 1, it is characterized in that described digital phase detection circuit module comprises oscillator, CPLD chip and resistance capacitance, and form oscillating circuit by integrated chip U2 inverter 74LS04, crystal oscillator XT1, resistance capacitance and produce local oscillation signal FIN and be connected with CPLD chip U311 pin.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420312966.4U CN204069031U (en) | 2014-06-13 | 2014-06-13 | A kind of induction wireless communication high speed demodulator of low cost |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420312966.4U CN204069031U (en) | 2014-06-13 | 2014-06-13 | A kind of induction wireless communication high speed demodulator of low cost |
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| Publication Number | Publication Date |
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| CN204069031U true CN204069031U (en) | 2014-12-31 |
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| CN201420312966.4U Expired - Lifetime CN204069031U (en) | 2014-06-13 | 2014-06-13 | A kind of induction wireless communication high speed demodulator of low cost |
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2014
- 2014-06-13 CN CN201420312966.4U patent/CN204069031U/en not_active Expired - Lifetime
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Granted publication date: 20141231 |
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| CX01 | Expiry of patent term |