CN105577219A - Broadband transceiver used for wired coaxial Ethernet - Google Patents
Broadband transceiver used for wired coaxial Ethernet Download PDFInfo
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- CN105577219A CN105577219A CN201410531527.7A CN201410531527A CN105577219A CN 105577219 A CN105577219 A CN 105577219A CN 201410531527 A CN201410531527 A CN 201410531527A CN 105577219 A CN105577219 A CN 105577219A
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Abstract
The invention provides a broadband transceiver used for wired coaxial Ethernet. The broadband transceiver comprises a receiving passage, a transmitting passage, and an internal clock module. The receiving passage comprises a low noise amplifier, a lower frequency conversion mixer, a filter, and an output buffering unit. The transmitting passage comprises an intermediate frequency amplifier, an upper frequency conversion mixer, and a power amplifier. The internal clock is generated by a phase-locked loop PLL, and the clock signals can be provided to the upper frequency conversion mixer and the lower frequency conversion mixer to realize the upward-shifting and the downward-shifting of the frequency spectrum. The broadband transceiver used for the wired coaxial Ethernet is advantageous in that by adopting the ultra-broadband radio frequency and intermediate frequency integrated circuit design technology, all of the ECO commercial frequency ranges and the signal bandwidths can be covered, and then the great adaptability and the wide market prospect can be provided.
Description
Technical field
The present invention relates to field of radio frequency integrated circuits, particularly relate to a kind of broadband transceiver being applied to wired coaxial Ethernet.
Background technology
From 2008, along with the tempo increase advancing telecommunications network, broadcasting and television network and the Internet integration of three networks relevant policies and specification to release, the continuous reinforcement of national government supporting dynamics.Various places radio and television departments also all accelerate the transformation to bilateral network.The active EOC scheme of EPON+ based on HomePlugAV technology is the scheme adapting to existing broadcasting and TV coax network at present most.Each network equipment manufacturer is also proposed oneself EOC product, and due to the gap of technical merit, the EOC product quality and performances of each network equipment manufacturer also have very large difference.
EOC (EthernetoverCable) technology is a kind of technology transmitted by coaxial cable by Ethernet base band data.EOC local-side device is as the optical node device of bidirectional network Transformation, the EPONONU optical-fiber network of first line of a couplet Metro access networks, the EOC terminal of second line of a couplet domestic consumer, after realizing that the ethernet signal of assigning to from EPONONU master control part conversion and modulation etc. are treated as EOC low frequency signal, after being coupled with cable TV signal settling signal again, send from output, realize applying with the connection of terminal equipment.
EOC can be divided into modulation (active) EOC and base band (passive) EOC two class according to the difference of transmission frequency.Active EOC can be divided into low frequency mode and high-frequency mode again according to modulation signal frequency range, and current low-frequency technology comprises HomePNA, HomePlug etc.; High frequency technique comprises BIOC, HiNOC, WiFi, MoCA etc.Because various technical scheme has respective pluses and minuses, and the CHINA RFTCOM Co Ltd of various places is in respective operation, lacks the state of unified management, makes the bidirectional rebuilding scheme of various places larger with the dynamics of propelling gap.This demand just caused for EOC chip is comparatively diversified.Current commercial chip is often only for specific criteria, and frequency band is narrower, and the limited bandwidth of process, does not meet domestic standard numerous and diverse, the present situation that bandwidth is adjustable.
Due to the universal of cable TV and the high transmission rates of coaxial cable, EOC technology is made to have comparatively wide market prospects.Meanwhile, along with the development of the business such as HDTV (High-Definition Television), broadcasting and TV broadband access network, EOC equipment need provide higher bandwidth to support the expansion of radio and TV operator's follow-up business.Therefore, how to obtain the EOC chip covering the commercial frequency range of current all EOC and signal bandwidth, make EOC chip have great adaptability and wide market prospects have become those skilled in the art's problem demanding prompt solution.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of broadband transceiver being applied to wired coaxial Ethernet, narrower for the frequency band solving EOC chip in prior art, the limited bandwidth of process, do not meet domestic standard numerous and diverse, the problem that bandwidth is adjustable.
For achieving the above object and other relevant objects, the invention provides a kind of broadband transceiver being applied to wired coaxial Ethernet, described broadband transceiver at least comprises:
Receiving path, transmitting path and internal clocking module;
Described receiving path comprises the first amplifier, the first frequency mixer, the first filter and output buffer;
Described first amplifier accepts radio-frequency input signals, for amplifying described radio-frequency input signals;
Described first frequency mixer is connected to described first amplifier, carries out mixing, radiofrequency signal is moved intermediate frequency for the local oscillation signal produced output signal and the described internal clock circuit of described first amplifier;
Described first filter is connected to described first frequency mixer, for carrying out filtering to the output signal of described first frequency mixer;
Described output buffer is connected to described first filter, for driving load;
Described transmitting path comprises the second amplifier, the second frequency mixer and the 3rd amplifier;
Described second amplifier accepts IF input signals, for regulating the amplitude of described IF input signals;
Described second frequency mixer is connected to described second amplifier, carries out mixing, intermediate-freuqncy signal is moved radio frequency for the local oscillation signal output signal of described second amplifier and described internal clock circuit produced;
Described 3rd amplifier is connected to described second frequency mixer, for the output signal of described second frequency mixer being amplified and export radio frequency output signal.
Preferably, described internal clocking module is phase-locked loop circuit.
Preferably, the adjustable gain of described first amplifier.
Preferably, described first amplifier is low noise amplifier.
Preferably, described first filter is passive or active structure.
Preferably, the bandwidth of described first filter is adjustable.
Preferably, described output buffer is intermediate frequency variable gain amplifier.
Preferably, described second amplifier is variable gain amplifier.
Preferably, described 3rd amplifier is power amplifier.
Preferably, external second filter be connected between described first amplifier and described first frequency mixer is also comprised.
Preferably, the band-gap reference circuit that reference voltage and reference current are provided also is comprised.
Preferably, the Serial Peripheral Interface realizing transfer of data is also comprised.
As mentioned above, the broadband transceiver being applied to wired coaxial Ethernet of the present invention, has following beneficial effect:
The broadband transceiver being applied to wired coaxial Ethernet of the present invention, treatable radio frequency signal frequency covers 800M ~ 2.7GHz, the compatible 50M ~ 200MHz intermediate-freuqncy signal bandwidth of energy, the EOC technical protocol of compatible existing market main flow.The broadband transceiver being applied to wired coaxial Ethernet of the present invention, by adopting the integrated circuit (IC) design technology of ultra-wide band radio-frequency and intermediate frequency, covering the commercial frequency range of current all EOC and signal bandwidth, having great adaptability and wide market prospects.
Accompanying drawing explanation
Fig. 1 is shown as the schematic diagram being applied to the broadband transceiver of wired coaxial Ethernet of the present invention.
Element numbers explanation
1 broadband transceiver being applied to wired coaxial Ethernet
111 low noise amplifiers
112 first frequency mixers
113 first filters
114 output buffers
115 second filters
121 variable gain amplifiers
122 second frequency mixers
123 power amplifiers
13 phase-locked loop circuits
14 band-gap reference circuits
15 Serial Peripheral Interface
RF_in radio-frequency input signals
IF_out IF output signal
IF_in IF input signals
RF_out radio frequency output signal
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this specification can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this specification also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
Refer to Fig. 1.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
As shown in Figure 1, the invention provides a kind of broadband transceiver 1 being applied to wired coaxial Ethernet, described broadband transceiver 1 at least comprises:
Receiving path, transmitting path and internal clocking module;
Described receiving path comprises the first amplifier, the first frequency mixer 112, first filter 113 and output buffer 114;
Described first amplifier accepts radio-frequency input signals RF_in, for amplifying described radio-frequency input signals RF_in;
Described first frequency mixer 112 is connected to described first amplifier, carries out mixing, radiofrequency signal is moved intermediate frequency for the local oscillation signal produced output signal and the described internal clock circuit of described first amplifier;
Described first filter 113 is connected to described first frequency mixer 112, for carrying out filtering to the output signal of described first frequency mixer 112;
Described output buffer 114 is connected to described first filter 113, for exporting IF output signal IF_out to drive load;
Described transmitting path comprises the second amplifier, the second frequency mixer 122 and the 3rd amplifier;
Described second amplifier accepts IF input signals, for regulating the amplitude of described IF input signals;
Described second frequency mixer 122 is connected to described second amplifier, carries out mixing, intermediate-freuqncy signal is moved radio frequency for the local oscillation signal output signal of described second amplifier and described internal clock circuit produced;
Described 3rd amplifier is connected to described second frequency mixer 122, amplifies for the signal exported by described second frequency mixer 122 and exports radio frequency output signal RF_out.
As shown in Figure 1, described broadband transceiver 1 comprises receiving path, transmitting path and internal clocking module.
Described receiving path is used for processing the radiofrequency signal that antenna receives, and obtains intermediate-freuqncy signal, and delivers to baseband module, to guarantee that follow-up baseband module can identify input signal.
Described transmitting path is used for the baseband signal that baseband module will send to process, and obtains radiofrequency signal, to guarantee that the signal sent can realize long-distance transmissions.
Described internal clocking module is for generation of internal clock signal, the clock signal that each module needs is provided, most importantly for described receiving path and described transmitting path provide local oscillation signal, make the radiofrequency signal in described receiving path become intermediate-freuqncy signal, the intermediate-freuqncy signal in described transmitting path becomes radiofrequency signal.As shown in Figure 1, in the present embodiment, described internal clocking module is preferably phase-locked loop circuit 13.Phase-locked loop circuit 13 (PhaseLockedLoop, PLL) accurate, stable local oscillation signal can be provided for described broadband transceiver, for the modulation and demodulation of signal, the frequency modulation of signal and demodulation, can guarantee that the signal after modulation and demodulation and frequency modulation and demodulation more precisely reacts original signal, improve jamproof ability.
As shown in Figure 1, described receiving path comprises the first amplifier, the first frequency mixer 112, first filter 113 and output buffer 114.
Described first amplifier connects the radio-frequency input signals RF_in that antenna receives, and for amplifying described radio-frequency input signals RF_in, suppresses the noise of post-module, to improve the sensitivity of receiving path entirety simultaneously.As shown in Figure 1, in the present embodiment, described first amplifier is preferably low noise amplifier 111 (LowNoiseAmplifier, LNA), and the gain of described low noise amplifier 111 can regulate.Described low noise amplifier 111, for amplifying small-signal, can effectively reduce the noise of amplifier self, improves the signal to noise ratio of output signal.
Described receiving path can also comprise the second external filter 115, as shown in Figure 1, described second filter 115 is connected to described low noise amplifier 111, for the interference signal beyond filtering radio spectrum, in the present embodiment, described second filter 115 is Surface Acoustic Wave Filter (SurfaceAcousticWaveFilter, SAWFilter), it is little that described Surface Acoustic Wave Filter has volume, be suitable for miniature envelope, consistency good, the advantage such as need not to adjust.
If described receiving path comprises external described second filter 115, then described first frequency mixer 112 is connected to described second filter 115; If described receiving path does not comprise external described second filter 115, then described first frequency mixer 112 is connected to described low noise amplifier 111.As shown in Figure 1, in the present embodiment, described first frequency mixer 112 is connected to described second filter 115, receive the output signal of described second filter 115, be connected to described phase-locked loop circuit 13 simultaneously, described first frequency mixer 112 is down-conversion mixer (DownMixer), the local oscillation signal that the radiofrequency signal export described second filter 115 and described phase-locked loop circuit 13 provide carries out mixing, radiofrequency signal is moved intermediate frequency by described first frequency mixer 112, for follow-up baseband module process.
As shown in Figure 1, described first filter 113 is connected to described first frequency mixer 112, the intermediate-freuqncy signal that described first frequency mixer 112 exports is carried out filtering, the harmonic wave beyond filtered signal bandwidth and interference signal, prevents aliasing and interference.Described first filter 113 can be passive or active structure, and the bandwidth of described first filter 113 can regulate.In the present embodiment, described first filter 113 is active, that bandwidth is adjustable filter.
As shown in Figure 1, described output buffer 114 is connected to described first filter 113, in the present embodiment, described output buffer 114 is variable gain amplifier (VariableGainAmplifier, VGA), for driving low-impedance load, the gain of described output buffer 114 is fixing or can regulates, in the present embodiment, described output buffer 114 is the variable gain amplifier of adjustable gain.Described output buffer 114 exports IF output signal IF_out to follow-up baseband module.
Described transmitting path comprises the second amplifier, the second frequency mixer 122 and the 3rd amplifier.
Described second amplifier accepts IF input signals IF_in, as shown in Figure 1, described second amplifier is variable gain amplifier 121, for regulating the amplitude of IF input signals IF_in.
As shown in Figure 1, in the present embodiment, described first frequency mixer 112 is connected to described second amplifier, receive the output signal of described second amplifier, be connected to described phase-locked loop circuit 13 simultaneously, described first frequency mixer 112 is up-conversion mixer (UpMixer), the local oscillation signal that the intermediate-freuqncy signal export described second amplifier and described phase-locked loop circuit 13 provide carries out mixing, intermediate-freuqncy signal is moved radio frequency by described second frequency mixer 122, makes the frequency transmitted can reach the frequency propagated in an atmosphere.
As shown in Figure 1, described 3rd amplifier is connected to described second frequency mixer 122, for the output signal of described second frequency mixer 122 is amplified and is exported radio frequency output signal RF_out, the amplitude of described radio frequency output signal RF_out is enough large, can not decay to None-identified because of long-distance transmissions.
As shown in Figure 1, described broadband transceiver also comprises band-gap reference circuit 14, and described band-gap reference circuit 14 provides reference voltage and reference current, to guarantee internal circuit working stability for internal circuit.
As shown in Figure 1, described broadband transceiver 1 also comprises Serial Peripheral Interface 15 (SerialPeripheralInterface, SPI), and described Serial Peripheral Interface 15 is for realizing the transmission of data.Described Serial Peripheral Interface 15 is a kind of high speeds, full duplex, synchronous communication bus, and on the pin of chip, only take four lines, has saved the pin of chip, simultaneously for the layout of PCB saves space, provides convenience.
The above-mentioned operation principle being applied to the broadband transceiver 1 of wired coaxial Ethernet is as follows:
Receive data:
Described low noise amplifier 111 receives described radio-frequency input signals RF_in from cable, antenna or other equipment receiving radiofrequency signal air, described radio-frequency input signals RF_in through long-distance propagation and decay, described radio-frequency input signals RF_in is amplified to the state of subsequent module energy identifying processing through adjustment gain by described low noise amplifier 111, described low noise amplifier 111 suppresses the noise of post-module simultaneously, to improve the sensitivity of receiving path entirety.In the present embodiment, external described second filter 115 is also connected with after described low noise amplifier 111, described second filter 115, for carrying out filtering to the output signal of described low noise amplifier 111, the interference signal beyond filtering radio spectrum, improves signal to noise ratio.Described first frequency mixer 112 is most important modules in receiving path, and described first frequency mixer 112 will move intermediate-frequency band to through the filtered radiofrequency signal of described second filter 115, makes the working frequency range of frequency in subsequent module of input data.The output signal of described first frequency mixer 112 carries out filtering by described first filter 113 again, the bandwidth of described first filter 113 is adjustable, the intermediate-freuqncy signal bandwidth that can export according to described first frequency mixer 112 regulates, with the harmonic wave beyond filtering intermediate-freuqncy signal bandwidth and interference signal, prevent aliasing and interference.The output signal of described first filter 113 exports described output buffer 114 to, in the present embodiment, described output buffer 114 is special shapes of a kind of intermediate frequency variable gain amplifier, amplification is carried out to the output signal of described first filter 113 and exports IF output signal IF_out, to drive low-impedance load.Described IF output signal IF_out shows as after follow-up identification, process again can the audio or video information of direct feel.
Send data:
Described variable gain amplifier 121 amplifies described IF input signals IF_in, regulates the amplitude of described IF input signals IF_in, still to identify after long range propagation decay to guarantee to transmit.Described second frequency mixer 122 is most important modules in transmission path, described second frequency mixer 122 moves the intermediate-freuqncy signal after amplifying through described variable gain amplifier 121 to radio frequency band, make the frequency operation sending data at transmit frequency band, so that cable transmission.The radiofrequency signal that described second frequency mixer 122 exports is amplified by described power amplifier 123, obtains radio frequency output signal RF_out, and to drive low-impedance load, described low-impedance load comprises cable or antenna.
The broadband transceiver being applied to wired coaxial Ethernet of the present invention, treatable radio frequency signal frequency covers 800M ~ 2.7GHz, the compatible 50M ~ 200MHz intermediate-freuqncy signal bandwidth of energy, the EOC technical protocol of compatible existing market main flow.The broadband transceiver being applied to wired coaxial Ethernet of the present invention, by adopting the integrated circuit (IC) design technology of ultra-wide band radio-frequency and intermediate frequency, covering the commercial frequency range of current all EOC and signal bandwidth, having great adaptability and wide market prospects.
In sum, the invention provides a kind of broadband transceiver being applied to wired coaxial Ethernet, comprise receiving path, transmitting path and internal clocking module.Receiving path comprises low noise amplifier (LNA), down-conversion mixer, filter and output buffer cell; Transmitting path comprises intermediate frequency amplifier, up-conversion mixer, and a power amplifier; Internal clocking has phase-locked loop pll to produce, and this clock signal is supplied to upper and lower conversion mixer, moves to realize the upper and lower of frequency spectrum; Low noise amplifier in receiving path is used for amplification input signal, suppresses the noise of post-module, to improve the sensitivity of receiving path entirety simultaneously; Low noise amplifier gain can regulate; An external filter can be inserted for the interference signal beyond filtering radio spectrum between low noise amplifier and down-conversion mixer; Radiofrequency signal is moved intermediate frequency by the down-conversion mixer in receiving path, for follow-up baseband module process; Filter in receiving path, for the harmonic wave beyond filtered signal bandwidth and interference signal, prevents aliasing and interference; Filter can be passive or active structure; Filter bandwidht can regulate; Output buffer cell in receiving path is the special shape of a kind of intermediate frequency variable gain amplifier (VGA), and main purpose is to drive low-impedance load; Export buffer cell gain to be fixing or can to regulate; Variable gain amplifier in transmitting path is for regulating input intermediate frequency baseband signal amplitude; Baseband signal is moved radio frequency by the up-conversion mixer in transmitting path, so that cable transmission; Radiofrequency signal is amplified by the power amplifier 123 in transmitting path, and can drive low-impedance load (cable or antenna).The present invention, by adopting ultra-wide band radio-frequency and intermediate frequency integrated circuit (IC) design technology, covers the commercial frequency range of current all EOC and signal bandwidth, has great adaptability and wide market prospects.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (12)
1. be applied to a broadband transceiver for wired coaxial Ethernet, it is characterized in that, described broadband transceiver at least comprises:
Receiving path, transmitting path and internal clocking module;
Described receiving path comprises the first amplifier, the first frequency mixer, the first filter and output buffer;
Described first amplifier accepts radio-frequency input signals, for amplifying described radio-frequency input signals;
Described first frequency mixer is connected to described first amplifier, carries out mixing, radiofrequency signal is moved intermediate frequency for the local oscillation signal produced output signal and the described internal clock circuit of described first amplifier;
Described first filter is connected to described first frequency mixer, for carrying out filtering to the output signal of described first frequency mixer;
Described output buffer is connected to described first filter, for exporting IF output signal to drive load; Described transmitting path comprises the second amplifier, the second frequency mixer and the 3rd amplifier;
Described second amplifier accepts IF input signals, for regulating the amplitude of described IF input signals;
Described second frequency mixer is connected to described second amplifier, carries out mixing, intermediate-freuqncy signal is moved radio frequency for the local oscillation signal output signal of described second amplifier and described internal clock circuit produced;
Described 3rd amplifier is connected to described second frequency mixer, for the output signal of described second frequency mixer being amplified and export radio frequency output signal.
2. the broadband transceiver being applied to wired coaxial Ethernet according to claim 1, is characterized in that: described internal clocking module is phase-locked loop circuit.
3. the broadband transceiver being applied to wired coaxial Ethernet according to claim 1, is characterized in that: the adjustable gain of described first amplifier.
4. the broadband transceiver being applied to wired coaxial Ethernet according to claim 1, is characterized in that: described first amplifier is low noise amplifier.
5. the broadband transceiver being applied to wired coaxial Ethernet according to claim 1, is characterized in that: described first filter is passive or active structure.
6. the broadband transceiver being applied to wired coaxial Ethernet according to claim 1, is characterized in that: the bandwidth of described first filter is adjustable.
7. the broadband transceiver being applied to wired coaxial Ethernet according to claim 1, is characterized in that: described output buffer is intermediate frequency variable gain amplifier.
8. the broadband transceiver being applied to wired coaxial Ethernet according to claim 1, is characterized in that: described second amplifier is variable gain amplifier.
9. the broadband transceiver being applied to wired coaxial Ethernet according to claim 1, is characterized in that: described 3rd amplifier is power amplifier.
10. the broadband transceiver being applied to wired coaxial Ethernet according to claim 1, is characterized in that: also comprise external second filter be connected between described first amplifier and described first frequency mixer.
11. broadband transceiver being applied to wired coaxial Ethernet according to claim 1, is characterized in that: also comprise the band-gap reference circuit providing reference voltage and reference current.
12. broadband transceiver being applied to wired coaxial Ethernet according to claim 1, is characterized in that: also comprise the Serial Peripheral Interface realizing transfer of data.
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| CN201410531527.7A CN105577219A (en) | 2014-10-10 | 2014-10-10 | Broadband transceiver used for wired coaxial Ethernet |
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| CN201410531527.7A CN105577219A (en) | 2014-10-10 | 2014-10-10 | Broadband transceiver used for wired coaxial Ethernet |
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Application publication date: 20160511 |