CN203166869U - Crystal oscillator frequency modulation system of FDMA communication - Google Patents
Crystal oscillator frequency modulation system of FDMA communication Download PDFInfo
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- CN203166869U CN203166869U CN 201320096724 CN201320096724U CN203166869U CN 203166869 U CN203166869 U CN 203166869U CN 201320096724 CN201320096724 CN 201320096724 CN 201320096724 U CN201320096724 U CN 201320096724U CN 203166869 U CN203166869 U CN 203166869U
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Abstract
The utility model provides a crystal oscillator frequency modulation system of FDMA communication, comprising a MCU controlling module and a connected baseband processor. The MCU controlling module is respectively connected with a signal chip and a converter. The baseband processor is connected with a frequency detector, an intermediate frequency filter, a mixer, a first amplifier and a band-pass filter in sequence. A first converter and two power amplifiers are connected between the signal chip and the converter in sequence. The converter is connected with an antenna through the other band-pass filter. The baseband processor is connected with the signal chip through a voltage controlled crystal oscillator. A piece of RDA1846S chip is used as the signal chip in a FDMA communication technology, the signal chip can output transmitting signals and local oscillator signals at the same time, and does not convention circuit methods of phase-locked loop and VCO are not used. The system combines mode operation switchover of the MCU controlling module, and is high in integration level. Phase locking time is lower than 500[mu]s. The system modulates frequency in a crystal oscillator manner, and is high in practicality, so that requirements of popular users are satisfied.
Description
Technical field
The utility model relates to the wireless communication technique field, and what especially relate to is a kind of crystal oscillator frequency modulation system of FDMA communication.
Background technology
At present, field of wireless communication in China, the digital radio mechanics of communication appears on the market, it has strong interference immunity, speech quality is good, the frequency efficiency height, that adopt mostly is digital handset wireless communication protocol--the DMR/DPMR that is issued by the ETSI tissue, what wherein the DPMR agreement adopted is arrowband (6.25kHz) FDMA technology, but because of aspect the signal modulation, all is to adopt traditional phase-locked loop and the circuit mode of VCO, has certain defective, more single in Frequency Band Selection, and there is debug difficulties in circuit design, and the cost height, aspect frequency modulation, can not adjust flexibly, design flexibility is lower, and then can not satisfy the demand of different autgmentabilities.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of crystal oscillator frequency modulation system that adopts the FDMA communication of chips incorporate crystal modulation is provided.
For achieving the above object, technical solution of the present utility model is: a kind of crystal oscillator frequency modulation system of FDMA communication, comprise continuous MCU control module and baseband processor, and described MCU control module also links to each other with signal chip and transducer respectively; Described baseband processor is connected with frequency discriminator, intermediate frequency amplifier, intermediate-frequency filter, frequency mixer, first amplifier and band pass filter successively, and described band pass filter links to each other with transducer; Be connected with first transducer and two amplifirers between described signal chip and the transducer in turn, described transducer also links to each other with antenna by another band pass filter, described baseband processor links to each other with signal chip by VCXO, and described signal chip adopts the RDA1846S chip.
Preferably, described VCXO adopts the VC-TCXO oscillator of 13MHz.
By adopting above-mentioned technical scheme, the beneficial effects of the utility model are: adopt 1 RDA1846S chip as signal chip in the FDMA communication technology, can export the signal chip that transmits with local oscillation signal simultaneously, not adopt the traditional circuit mode of phase-locked loop and VCO.Pattern operation in conjunction with the MCU control module is switched, when being in emission state, the RDA1846S chip is used as radio-frequency transmissions, modulation signal is imported the RDA1846S chip after VCXO and baseband processor analysis, radiofrequency signal enters transmission channel module by diverter switch and launches from antenna.When being in accepting state, the radiation pattern of RDA1846S chip is set to export local oscillation signal, thereby the local oscillation signal as first intermediate frequency, local oscillation signal enters frequency mixer by diverter switch and carries out mixing with the reception signal, the intermediate-freuqncy signal that produces enters the frequency discriminator demodulation by intermediate frequency low pass filter and amplifier, and is exported by loud speaker.The circuit complexity that the phase-locked loop of relative traditional circuit and VCO exist, debug difficulties, coherence request height to components and parts, the utility model adopts one chip to realize emission and output local oscillation signal simultaneously, the integrated level height, and the phase-locked time is lower than 500 μ s, time is short, exempt from debugging, practicality is very high, satisfies the public users demand.
Description of drawings
Fig. 1 is system block diagram of the present utility model.
(identify among the figure: 1, MCU control module; 2, baseband processor; 3, signal chip; 4, VCXO; 5, first transducer; 6, amplifirer; 7, transducer; 8, band pass filter; 9, antenna; 10, band pass filter; 11, first amplifier; 12, frequency mixer; 13, intermediate-frequency filter; 14, intermediate frequency amplifier; 15, frequency discriminator.）
Embodiment
Further specify the utility model below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the crystal oscillator frequency modulation system of a kind of FDMA communication of the present utility model comprises continuous MCU control module 1 and baseband processor 2, and described MCU control module 1 also links to each other with signal chip 3 and transducer 7 respectively; Described baseband processor 2 is connected with frequency discriminator 15, intermediate frequency amplifier 14, intermediate-frequency filter 13, frequency mixer 12, first amplifier 11 and band pass filter 10 successively, and described band pass filter 10 links to each other with transducer 7; Be connected with first transducer 5 and two amplifirers 6 between described signal chip 3 and the transducer 7 in turn, described transducer 7 also links to each other with antenna 9 by another band pass filter 8, described baseband processor 2 links to each other with signal chip 3 by VCXO 4, described signal chip 3 adopts the RDA1846S chip, it is the highest that chip RDA1846S can be described as present integrated level, the intercom RF radio frequency chip of package area minimum, it is by low intermediate frequency receiver and direct upconversion transmitter framework, with integrated hundreds of discrete devices and the integrated circuit of having substituted in the traditional scheme of single-chip, significantly simplified circuit design, reduced the BOM cost, improved the price competitiveness of end product, aspect power consumption, RDA1846S is operated in power consumption under the super low-power consumption sleep pattern less than 10 μ A, performance far below like product, in addition, RDA1846 power supply supply district is wide, supports 2.7～5.5V, the client can regulate according to own needs, has increased the flexibility of design greatly.Described VCXO 4 adopts the VC-TCXO oscillator of 13MHz, and because of being changed to ± 12PPm of the voltage-controlled oscillating frequency of VC-TCXO oscillator, the control voltage range is 0.5～2.5V.And the intercom transmit frequency range is 400～470MHz, the frequency modulation of signal changes along with the variation of output rf frequency, the signal output amplitude of can well application software adjusting baseband processor according to different rf frequencies makes it the frequency modulation unanimity in transmit frequency range, plays the effect of the frequency signal that provides stable.
Operation principle: transmission channel, input signal is through 1 unified allocation of resources of MCU control module, and feed back to MCU control module 1 after the Treatment Analysis in conjunction with baseband processor 2, coordinate control signal chip 3 by MCU control module 1 and produce the radiofrequency signal of emission, its chip output is set to export radiofrequency signal, thereby output simulation infrasonic frequency or digital infrasonic frequency, be connected with VCXO 4 between described baseband processor 2 and the signal chip 3, frequency adjustment end through VCXO 4, carry out effective frequency modulation, and by the handover operation of signal chip 3 in conjunction with MCU controller 1, through first transducer 5, two amplifirers 6, transducer 7 and band pass filter 8, carry out the signal conversion, amplify, filtering is launched audio signal by antenna 9 after handling.
Receive path: the signal that receives from antenna 9 when signal receives carries out the radio frequency amplification after passing through band pass filter 8 and transducer 6, after passing through another band pass filter 10 filtering again, carrying out noise elimination by first amplifier 11 is amplified in the frequency mixer 12, wherein signal chip 3 is in conjunction with MCU control module 1 and baseband processor 2, be set to export local oscillation signal, and by being connected with frequency mixer 12 after the frequency adjustment of VCXO 4, with local oscillation signal and input signal mixing and generate intermediate-freuqncy signal, IF-FRE is 38.55MHz, eliminate spurious signal through intermediate-frequency filter 13, after amplifying, intermediate frequency amplifier 14 carries out corresponding frequency discrimination through frequency discriminator 14 again, produce audio signal, by after baseband processor 2 and MCU control module 1 analyzing and processing, obtain voice signal at last.Overall structure is simple, adopt the one chip structure, in conjunction with the crystal oscillator frequency modulation of VC-TCXO oscillator, the signal output amplitude of adjusting baseband processor according to different rf frequency makes it the frequency modulation unanimity in transmit frequency range, plays the effect of the frequency signal that provides stable.
Above-described, only be preferred embodiment of the present utility model, can not limit the scope that this practicality is implemented, every equalization of doing according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.
Claims (2)
1. the crystal oscillator frequency modulation system of a FDMA communication comprises continuous MCU control module (1) and baseband processor (2), and it is characterized in that: described MCU control module (1) also links to each other with signal chip (3) and transducer (7) respectively; Described baseband processor (2) is connected with frequency discriminator (15), intermediate frequency amplifier (14), intermediate-frequency filter (13), frequency mixer (12), first amplifier (11) and band pass filter (10) successively, and described band pass filter (10) links to each other with transducer (7); Be connected with first transducer (5) and two amplifirers (6) between described signal chip (3) and the transducer (7) in turn, described transducer (7) also links to each other with antenna (9) by another band pass filter (8), described baseband processor (2) links to each other with signal chip (3) by VCXO (4), and described signal chip (3) adopts the RDA1846S chip.
2. the crystal oscillator frequency modulation system of a kind of FDMA communication according to claim 1 is characterized in that: the VC-TCXO oscillator of described VCXO (4) employing 13MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320096724 CN203166869U (en) | 2013-03-04 | 2013-03-04 | Crystal oscillator frequency modulation system of FDMA communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320096724 CN203166869U (en) | 2013-03-04 | 2013-03-04 | Crystal oscillator frequency modulation system of FDMA communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203166869U true CN203166869U (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320096724 Expired - Fee Related CN203166869U (en) | 2013-03-04 | 2013-03-04 | Crystal oscillator frequency modulation system of FDMA communication |
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|---|---|
| CN (1) | CN203166869U (en) |
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2013
- 2013-03-04 CN CN 201320096724 patent/CN203166869U/en not_active Expired - Fee Related
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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 |
Granted publication date: 20130828 Termination date: 20190304 |
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| CF01 | Termination of patent right due to non-payment of annual fee |