Newest direct and wireless radio frequency (RF) – sampling is sent and receive implement–Include the AFE7444 of heart state apparatus and AFE7422 facility, support 4 to mix respectively two antenna channel–Provide a variety of powerful functions, make a variety of advanced systems characteristic, if much frequency band and much mode are operated, and frequency conversion and jump quickly frequency becomes a possibility. These functions become from the point of systematic concept gain ground increasingly, be like muti_function array, what large bearing accuses an antenna is different child array can be configured to need according to circumstance or task and carry out a variety of function; this includes radar, communication or electronic fight (EW) function, if pursue,1 is shown.
Muti_function control array system
In addition, these systems often need to come true to jump quickly frequency, so that connect,repeat too or aleatoric alignment adjusts working frequency gradually, if pursue,2 are shown. Carry out so can avert factitious interference, be on guard to signal explores or facilitate carry out prevent an electron to cheat a technology (electronic deceit: Distort the electronic autograph) of radar reflex signal.
Span many Nai Kui this the frequency nimble of the special zone changes operation
To understand these functions further, let us study sampling of compositive type RF is sent and receive above all implement functional module, if pursue,3 are shown.
AFE7444/AFE7422 RF sampling is sent and receive implement functional module
When receiver and transmitter union apply, these functional module will offer with following means enhance a function:
· spans to till the extremely wide RF frequency range of 6 GHz undertakes,be operated from a few MHz, handle the blame instant bandwidth of very wide extensive, highest can amount to 1.5 GHz.
· number signal handles module, supportive group and depolymerization add up to much seed belt or weaveform, every stature is taken or weaveform can be in the processing of travel of digital data inpour that receive or sends side to serve as independence.
Much frequency band or much mode signal are handled
Let us consider to handle a function through using sampling of broad frequency band, synthesis and number now, will handle the use case of much frequency band or much mode signal. If pursue,4 are shown.
The much frequency band of use AFE7422 and AFE7444 is sent and receive configuration
This setting can generate signal of much frequency band, this signal includes 3 to differ child belt, total bandwidth is 2.75 GHz. Receiver is in span many Nai Kui this the sampling in the whole frequency band of the special zone, issue sampling data feed frequency conversion module to the number next (have) of many shunt-wound class. The method is the digital control oscillator that passes independence (NCO) and digital first detector, choice much stature is taken and them change is fundamental frequency signal. Application is smoked anthology, next the bandwidth according to single signal, lower output sampling rate, restrain the derogation outside the belt.
Contrarily, in deliver side, each digital inputs shed an input in class of the frequency conversion on the number of many paralell connection, frequency conversion will change fundamental frequency signal on for its corresponding target frequency. Next, data will be exceeded to sample to RF digital-to-analogue converter (rate of DAC) output sampling, the signal of broad frequency band after through the RF DAC in last class synthesis incorporates (limits arrives from 700 MHz 3.45 GHz) .
Frequency conversion and jump frequency
You can be passed select individual frequency band only, use in-house number annulus to answer, choose to place before sending this signal afresh next child take applied frequency to move, a case. If pursue,5 are shown.
Use AFE7444/AFE7422 realizes frequency conversion or jump frequency
This setting can capture the signal of much frequency band that preamble place narrates. Choice of module of the frequency conversion below the number becomes independent child belt, its changeover is fundamental frequency signal and through the number filter is delivered. Digital filter will be cleared the derogation outside the belt, be like harmonic or mixing product. Annulus of the number inside chip winds way, support exports the number of digital receiver data feed to enter transmitter path directly, and need not leave chip, why to and need not connect replace handle equipment additionally.
The signal after needing a filter wave only up frequency conversion is answered for the frequency that receives at first, make piece piece on digital repeater. Jump for deploy frequency transmitter, need makes the NCO process designing of transmitter part its output requires new frequency, send frequency to move afresh next signal. If pursue,the maize trace place in a collection of illustrative plates of analyzer of chart of 5 intermediate frequency is shown, and its and the spectrum of much frequency band that receive at first (green trace) compare.
The frequency transition on the oscillator
Till now, my illustrate basic idea, similar method can be used at supporting other use case, include:
Frequency conversion of · much frequency band. Because used the number of many paralell connection,next frequency conversion are mixed on frequency conversion module, so you can be received and be group of solution of signal of much frequency band many independence child carry signal, the frequency that brings signal application independence to every stature next moves, and classics piece on in-house number annulus answers feed to enter transmitter path, send afresh after achieving new frequency child carry signal.
· jumps quickly frequency. Because we are OK and new,process designing NCO obtains updated frequency inside a few millisecond thereby, or use the practicable on method of every signal below ping-pong mode by turns many NCO, can be received and send frequency nimble to change according to repeatability or aleatoric alignment signal. The changeover between these two kinds of frequency is shown 6 times like the graph.
· brae arises / direct figure synthesizes mode. Be used at every transmitter inside generator of frequency of buy sine Boeing, support generate the frequency brae with radar commonly used system and frequency modulation successive wave (FMCW) .
· synchronism broad frequency band scans and narrow frequency band observation. Because of sampling of every receiver front class can join many numbers treat form, so you can choose to configure to receive method for mode of broad frequency band. Output spans Nai Kui this the sampling data of especially whole frequency band, and observation is highest the blame instant bandwidth that can amount to 1.5 GHz, scan then the presence that whether has any signal. Meanwhile, you can be configured narrow frequency band takes the 2nd route that chooses mode, enlarge hind analyses all signal that explore below mode of broad frequency band accurately.