CN108390695A - A kind of frequency converter and broadcasting and TV wifi communication systems based on RFFC2071A - Google Patents
A kind of frequency converter and broadcasting and TV wifi communication systems based on RFFC2071A Download PDFInfo
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- CN108390695A CN108390695A CN201810299183.XA CN201810299183A CN108390695A CN 108390695 A CN108390695 A CN 108390695A CN 201810299183 A CN201810299183 A CN 201810299183A CN 108390695 A CN108390695 A CN 108390695A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
Abstract
The present invention provides a kind of frequency converter based on RFFC2071A, it is characterised in that：The frequency converter based on RFFC2071A includes that a master chip circuit, a serial programmable bus and hardware controls port circuit, an external crystal oscillating circuit, a power supply circuit, a logical address identification circuit, a noise suppression circuit, one first balancedunbalanced transformation input circuit, one first balancedunbalanced transformation output circuit, one second balancedunbalanced transformation input circuit and one second balancedunbalanced convert output circuit.The present invention also provides a kind of broadcasting and TV wifi communication systems, the standard based on IEEE802.11 is combined using OFDM technology and frequency conversion amplifying technique, is reduced the multi-path jamming of transmission space and is influenced, realizes that transmission rate is high, wide coverage.
Description
Technical field
The present invention relates to mobile communication field more particularly to a kind of frequency converter and broadcasting and TV wifi based on RFFC2071A are logical
Letter system.
Background technology
It is extensive universal with national WLAN, to surf the Internet it is current to use a kind of most wide network access using wifi.
And the speed of wifi transmission is very fast, and unicast communication speed can reach 54Mbps, if using MIMO technology, that speed energy
It is increased to 108Mbps.Optical fiber network access is more commonly used in big city, but northwestward remote districts and nomadic people are come
It says, to meet their online demand, it is expensive if there are networking complexity with traditional fiber optic stretch technology networking, it builds
The disadvantage for time length of standing, therefore these areas are relatively suitble to use communication.Since wifi signal frequencies are 2.4GHz,
It is easily disturbed, is not suitable for carrying out remote transmission covering.In order to solve this problem, it is necessary to by the way of frequency conversion transmission.Than
The existing frequency range 670MHz~760MHz in broadcasting and TV somewhere is such as utilized, base station arrives network signal by frequency changer circuit 2.4GHz
The signal shift frequency of 700Mhz, 700M signals, which are emitted by amplification by antenna, to be covered.User terminal receives the base stations 700M by CPE
Signal is converted to 2.4G frequency ranges after reception is handled by frequency changer circuit, meets the online demand of this area user.
In order to improve transmission rate, MIMO technology is used on broadcasting and TV 700M wireless communication systems, traditional frequency conversion device is by reflecting
Phase device (PD), loop filter (LPF), voltage controlled oscillator (VCO), frequency divider composition frequency synthesizer of phase locking (PLL), such as Fig. 1.
PLL, with reference to high steady precision crystal oscillator, exports stable local frequency according to input, using power splitter, enters mixing after amplifier
Frequency needed for device generation system.Using traditional frequency conversion device (such as Fig. 2), there are electricity on broadcasting and TV 700M wireless communication mimo systems
Road is complicated, and volume is big, and power consumption is high, leaks the shortcomings of big.It is not easy to the miniature requirement of end-user product.It is traditional simultaneously
PLL frequency bandwidths are narrow, and generally only tens MHz, minority reaches 200MHz, cannot all meet broadcasting and TV full frequency band 470~
The demand (frequency range of broadcasting and TV different regions covering is different) of 860MHz, there is replacement frequency range will replace PLL chips.
Invention content
One of the technical problem to be solved in the present invention is to provide a kind of frequency converter based on RFFC2071A, program base
In the standard of IEEE802.11, combined using OFDM technology and frequency conversion amplifying technique, reducing the multi-path jamming of transmission space influences,
Realize that transmission rate is high, wide coverage.
One of the problem of the present invention, is realized in：
A kind of frequency converter based on RFFC2071A, the frequency converter include a master chip circuit, a serial programmable bus
With hardware controls port circuit, an external crystal oscillating circuit, a power supply circuit, a logical address identification circuit, noise suppressed electricity
Road, one first balanced-unbalanced transformation input circuit, one first balanced-unbalanced transformation output circuit, one second balance-are no
Balanced transformation input circuit and one second balanced-unbalanced convert output circuit, and the master chip circuit includes a chip U15,
The model RFFC2071A of the chip U15, the first pin of the chip U15, the 9th pin, the 29th pin, third
Ten pins, the 31st pin and the 32nd pin are connected to serial programmable bus and hardware controls port circuit, institute
The tenth pin for stating chip U15 is connected to external crystal oscillating circuit, the 13rd pin of the chip U15 and the connection of the 14th pin
Input circuit is converted to the first balanced-unbalanced, the 15th pin and the 16th pin of the chip U15 are connected to logically
Location identification circuit, the 17th pin and the 18th pin of the chip U15 are connected to the first balanced-unbalanced transformation output electricity
Road, the 5th pin, the 19th pin and the 22nd pin of the chip U15 are connected to power supply circuit, the chip U15's
23rd pin and the 24th pin be connected to the second balanced-unbalanced transformation input circuit, the second of the chip U15
17 pins and the 28th pin are connected to the second balanced-unbalanced transformation output circuit, the 4th pin of the chip U15
It is connected to noise suppression circuit, the 12nd pin of the chip U15 and the 33rd pin ground connection.
Further, the frequency converter further includes a loop filter circuit, the port of the loop filter circuit respectively with
The 6th pin, the 7th pin and the 8th pin of the chip U15 is correspondingly connected with.
Further, the frequency converter further includes a fault warning circuit, the port of the fault warning circuit with it is described
The 26th pin of chip U15 connects.
The second technical problem to be solved by the present invention is to provide a kind of broadcasting and TV wifi communication systems, and the program is based on
The standard of IEEE802.11 is combined using OFDM technology and frequency conversion amplifying technique, is reduced the multi-path jamming of transmission space and is influenced, real
Existing transmission rate is high, wide coverage.
The two of the problem of the present invention, are realized in：
A kind of broadcasting and TV wifi communication systems, including a digital transmitting and receiving processing module, one main mouthful of receives link, a main mouth transmitting
Link, one auxiliary mouthful of receives link, an auxiliary mouth transmitting link, two first sound tables, a frequency conversion amplifying circuit, a main switching switch, one
Main mouth antenna, an auxiliary switching switch and one auxiliary mouthful of antenna, further include two serial programmable buses, the frequency conversion amplifying circuit includes
Two frequency converter, two low-noise amplifiers, two rising tone tables, two bandpass filters and two power amplifiers based on RFFC2071A, institute
Digital transmitting and receiving processing module is stated by two serial programmable buses to be respectively connected with two frequency converters based on RFFC2071A；
The digital transmitting and receiving processing module emit that link is connected to a frequency converter based on RFFC2071A by main mouth the
First output end of one input terminal, the frequency converter based on RFFC2071A passes sequentially through a rising tone table and a power amplifier
It is connected to main switching switch, the main switching switch passes sequentially through a bandpass filter and a low-noise amplifier is connected to and is based on
The second output terminal of second input terminal of the frequency converter of RFFC2071A, the frequency converter based on RFFC2071A passes sequentially through one
First sound table and main mouth receives link are connected to digital transmitting and receiving processing module, and the main switching switch is additionally coupled to main mouth antenna；
The digital transmitting and receiving processing module emits link by auxiliary mouth and is connected to another frequency converter based on RFFC2071A
First output end of first input end, the frequency converter based on RFFC2071A passes sequentially through another rising tone table and another work(
Electric discharge road is connected to auxiliary switching switch, and the auxiliary switching switch passes sequentially through another bandpass filter and another low-noise amplifier
It is connected to the second input terminal of the frequency converter based on RFFC2071A, the second output terminal of the frequency converter based on RFFC2071A
It passes sequentially through another first sound table and auxiliary mouth receives link is connected to digital transmitting and receiving processing module, the auxiliary switching switch is also connected with
To auxiliary mouth antenna；
Each frequency converter based on RFFC2071A includes a master chip circuit, a serial programmable bus and hardware
Control port circuit, a power supply circuit, a logical address identification circuit, a noise suppression circuit, one first balanced-unbalanced become
Change input circuit, one first balanced-unbalanced transformation output circuit, one second balanced-unbalanced transformation input circuit and one the
Two balanced-unbalanceds convert output circuit, and the master chip circuit includes a chip U15, the model of the chip U15
The first pin, the 9th pin, the 29th pin, the 30th pin, the 31st pin of RFFC2071A, the chip U15
And the 32nd pin be connected to serial programmable bus and hardware controls port circuit, the 13rd of the chip U15 draws
Foot and the 14th pin are connected to the first balanced-unbalanced transformation input circuit, the 15th pin and the tenth of the chip U15
Six pins are connected to logical address identification circuit, and it is flat that the 17th pin and the 18th pin of the chip U15 are connected to first
Weighing apparatus-unbalanced transformation output circuit, the 5th pin, the 19th pin and the 22nd pin of the chip U15 are connected to confession
Circuit, the 23rd pin and the 24th pin of the chip U15 are connected to the second balanced-unbalanced transformation input electricity
Road, the 27th pin and the 28th pin of the chip U15 are connected to the second balanced-unbalanced transformation output circuit,
The 4th pin of the chip U15 is connected to noise suppression circuit, the 12nd pin and the 33rd pin of the chip U15
Ground connection；
The main mouth transmitting link and auxiliary mouth transmitting link respectively corresponding on two frequency converters based on RFFC2071A the
One balanced-unbalanced convert input circuit input terminal connection, two rising tone tables respectively with two changes based on RFFC2071A
The output end connection of corresponding first balanced-unbalanced transformation output circuit on frequency device, two low-noise amplifiers respectively with
The input terminal connection of corresponding second balanced-unbalanced transformation input circuit on two frequency converters based on RFFC2071A, described in two
The second balanced-unbalanced corresponding on two frequency converters based on RFFC2071A converts the defeated of output circuit to first sound table respectively
Outlet connects；The two serial programmable buses respectively with to correspond to serial programmable on two frequency converters based on RFFC2071A total
Line is connect with the port of hardware controls port circuit；Wherein one frequency converter based on RFFC2071A further includes an external crystalline substance
Shake circuit, and the external crystal oscillating circuit is connect with the tenth pin of chip U15 on two frequency converters based on RFFC2071A respectively.
Further, the frequency converter based on RFFC2071A further includes a loop filter circuit, the loop filtering electricity
Sixth pin, seventh pin and eightth pin of the port on road respectively with the chip U15 are correspondingly connected with.
Further, the frequency converter based on RFFC2071A further includes a fault warning circuit, the fault warning electricity
The port on road is connect with the 26th pin of the chip U15.
The advantage of the invention is that：
The present invention uses the frequency converter of RFFC2071A, the frequency converter to have on broadcasting and TV 700M wireless communication mimo systems
Following advantage：
1, high integration, small size, low-power consumption can make product realize miniaturization；
2, radio frequency operation frequency range：30M~2700MHz, VCO frequency range：85M~2700MHz can meet broadcasting and TV full frequency band
Demand；
3, flexible each channel configuration is realized using software and radio technique；
4, accurately frequency stability, wifi signals are not influenced by frequency deviation so that rate declines after can meeting frequency conversion.
Description of the drawings
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the structural schematic diagram of traditional frequency synthesizer of phase locking (PLL).
Fig. 2 is application schematic diagram of traditional frequency converter in MIMO broadcasting and TV 700M communication systems.
Fig. 3 is a kind of frequency converter based on RFFC2071A of the present invention
Fig. 4 is application schematic diagram of the frequency converter of the present invention in MIMO broadcasting and TV 700M communication systems.
Specific implementation mode
To make the present invention be clearer and more comprehensible, now with a preferred embodiment, and attached drawing is coordinated to be described in detail below.
As shown in figure 3, a kind of frequency converter based on RFFC2071A of the present invention, frequency converter of the invention mainly uses
Model RFFC2071A chips, to solve defect existing for traditional frequency conversion device.
The frequency converter based on RFFC2071A includes a master chip circuit, a serial programmable bus and hardware controls
It is port circuit, an external crystal oscillating circuit, a power supply circuit, a logical address identification circuit, a noise suppression circuit, one first flat
Weighing apparatus-unbalanced transformation input circuit, one first balanced-unbalanced transformation output circuit, the transformation input of one second balanced-unbalanced
Circuit, one second balanced-unbalanced transformation output circuit, a loop filter circuit and a fault warning circuit, the master chip
Circuit includes the model RFFC2071A of chip a U15, the chip U15, and the first pin of the chip U15, the 9th draw
Foot, the 29th pin, the 30th pin, the 31st pin and the 32nd pin be connected to serial programmable bus with
Hardware controls port circuit, the tenth pin of the chip U15 are connected to external crystal oscillating circuit, and the 13rd of the chip U15 the
Pin and the 14th pin are connected to the first balanced-unbalanced transformation input circuit, the 15th pin of the chip U15 and the
16 pins are connected to logical address identification circuit, and the 17th pin and the 18th pin of the chip U15 are connected to first
Balanced-unbalanced converts output circuit, and the 5th pin, the 19th pin and the 22nd pin of the chip U15 are connected to
Power supply circuit, the 23rd pin and the 24th pin of the chip U15 are connected to the transformation input of the second balanced-unbalanced
Circuit, the 27th pin and the 28th pin of the chip U15 are connected to the second balanced-unbalanced transformation output electricity
4th pin on road, the chip U15 is connected to noise suppression circuit, the 12nd pin and the 33rd of the chip U15
Pin is grounded；The 6th pin, the 7th pin and the 8th pin of the chip U15 is correspondingly connected with the port of loop filter circuit,
The 26th pin of the chip U15 is connected to the port of fault warning circuit.
The master chip circuit is mainly used for that each circuit module is controlled and managed；The serial programmable bus with
Hardware controls port circuit is for connecting serial programmable bus and hardware electric wire；The external crystal oscillating circuit is brilliant using temperature compensation
Shake (TCXO) generate 26MHz frequency do circuit reference benchmark；The power supply circuit is used to provide power supply for whole equipment；It is described
For being identified to CPU, this circuit is used in MIMO products logical address identification circuit, and there are two the same circuit topology, CPU
It to go to identify the two circuits respectively；The noise suppression circuit is for inhibiting low-frequency noise；First balanced-unbalanced
Transformation input circuit be for by radiofrequency signal RF1 by 1:Single-ended signal is converted into differential signal and is connected to by 1 balun circuit
Internal mixers 1；The first balanced-unbalanced transformation output circuit is for radiofrequency signal RF1 to be passed through internal mixers 1
Become intermediate-freuqncy signal IF1 and passes through 4:1 balun circuit output；The second balanced-unbalanced transformation input circuit is for inciting somebody to action
Intermediate-freuqncy signal IF2 passes through 1:Single-ended signal is converted into differential signal and is connected to internal mixers 2 by 1 balun circuit；Described second
Balanced-unbalanced transformation output circuit is passed through for intermediate-freuqncy signal IF2 to be become radiofrequency signal RF2 by internal mixers 2
4:1 balun circuit output；The loop filter circuit and a fault warning circuit
There are 2 frequency mixers inside the master chip circuit, radiofrequency signal RF1 internal mixers 1 corresponding with intermediate-freuqncy signal IF1,
Radiofrequency signal RF1 is down-converted into intermediate-freuqncy signal IF1.Radiofrequency signal RF2 internal mixers 2 corresponding with intermediate-freuqncy signal IF2, will in
Frequency signal IF2 up-converts to radiofrequency signal RF2.
The present invention uses the frequency converter of RFFC2071A chips, and by the application of frequency converter in MIMO broadcasting and TV 700M communication systems
System.RFFC2071A frequency converters are a high integration, and High Linear, programmable frequency converter, it is integrated with broadband VCO, PLL
With No. 2 frequency mixers.
1, the VCO of chip interior has temperature-compensating, and it is metastable that essence can be provided in -40 DEG C~+85 DEG C temperature ranges
Rate-adaptive pacemaker is avoided that losing lock occurs in frequency converter in temperature change, while by frequency deviation after also making wifi signals pass through frequency converter
Influence smaller, guaranteed rate stabilization.
2, RFFC2071A frequency converters are full duplex operating modes, internal there are two broadband mixer, support from 30M~
The RF/IF frequencies of 2700MHz.Each frequency mixer there are one input port and an output port, can be used for IF or RF (
That is up-conversion or down coversion can be used for simultaneously).Frequency converter carries out register configuration by 3 serial programmable buses,
Coordinate the mode of the states such as enabled, pattern control that 2 frequency mixers in circuit is allowed to work alternatively respectively simultaneously, it can also be according to circuit
Linear requirements the operating currents of 2 frequency mixers changed by serial programmable bus respectively (each frequency mixer has 7 kinds of work
Electric current) reduce the power consumption of circuit.In MIMO broadcasting and TV 700M communication systems, the frequency converter of RFFC2071A passes through programmable side
Formula allows 2 frequency mixers in circuit to be worked alternatively respectively according to wifi signal uplink and downlink switching sequences, and it is low so that frequency mixer is worked in
Power consumption operating current pattern so that the power consumption of entire frequency converter only has 0.4W (being the half of full-duplex mode).
3, in the frequency converter of RFFC2071A between frequency mixer more than 60dB isolations, so that circuit is worked at the same time up-conversion under
It will not be interfered with each other when frequency conversion；LO/RF (IF) rf frequency isolation more than 50dB so that be less than -45dBm on radio-frequency channel
Band stray leakage, the quantity of SAW filter in MIMO broadcasting and TV 700M communication systems can be reduced, not only shorten research and development debugging
Period can also reduce the cost of product.
4, the frequency converter of RFFC2071A has High Linear IIP3 (+23dBm), good phase noise -108dBc/Hz
(10kHz deviations), accurately frequency stability, the frequency of 1.5Hz adjust the circuit characteristics such as stepping, these good circuit characteristics
So that wifi signals indices such as EVM and receiving sensitivity after frequency changer circuit is not deteriorated, keeps the stabilization of transmission rate.
The circuit structure of RFFC2071A frequency converters is as shown in figure 3, operation principle is summarized as follows with circuit characteristic：
RFFC2071A frequency converters need the external reference frequency of 10M~104MHz, the design to use temperature compensating crystal oscillator (TCXO)
The frequency for generating 26MHz does circuit reference benchmark.By being sent into phase discriminator after a parametric frequency divider, and by the highest of phase discriminator
Frequency limit is in 52MHz.
VCO cores are made of three VCOs inside RFFC2071A frequency converters, the model of covering LO frequencies 85M~2700MHz
It encloses.Each VCOs has 128 sections, for realizing in entire adjustable range, meets VCO gain and optimum phase noise.Chip energy
PLL register groups are configured according to set value, automatically select correct VCO wave bands, generate required LO frequencies.VCO is certainly
Dynamic selection must draw high " ENBL " with when coarse adjustment, once correctly VCO wave bands are selected, PLL will lock correct frequency.
VCO has temperature-compensation circuit, and no matter how VCO wave bands select, and the gain of VCO can be made in -40 DEG C~+85 DEG C temperature ranges
It keeps stablizing.And the loop bandwidth and phase noise being consistent.
Inside RFFC2071A frequency converters 3 tunnels are controlled comprising the fractional frequency-division phase-locked loop (PLL) with charge pump, this PLL
VCO.PLL includes automated calibration system, is influenced with offsetting in process of environmental change, it is ensured that repeatable loop response and phase noise
Performance.In addition to VCO is automatically selected and coarse adjustment, there are one loop filtering alignment mechanism, by adjust the electric current of charge pump come into
Capable holding loop bandwidth.VCO outputs are divided in a high frequency prescalar first, then input N dividers.The electricity
Road is a decimal frequency divider, includes the sequencer of a dual pre-divider and a digitized compensation, it allows
Very small frequency stepping.The noise occurred at random when frequency deviation is more than 100kHz simultaneously will be weakened by loop filter, with
Optimize phase noise and locking time.When using the reference frequency of 26MHz, the stepping of synthesizer is typically 1.5Hz.
RFFC2071A frequency converters carry out register configurations by 3 serial programmable buses, and be arranged ENBL, MODE,
These three hardware controls port bootroms of RESETX, and trigger VCO automatically select and coarse adjustment, with frequency dividing after reference frequency one
Feeding phase discriminator is played, phase discriminator takes out the phase difference of the two signals, passes through the resistance of low noise and outside by chip interior
Phase difference is changed the average voltage of VCO in order to control by the active loop filter for holding matching network composition.Then start phaselocked loop
Locking.The locking time of PLL will depend on many factors；Including cyclic bandwidth and reference frequency.Clock frequency determines state
The speed of machine and internal calibration operation.52MHz phase discriminator frequencies provide most fast locking time.After PLL lockings, chip locking
Detect the high level of foot output 0.8V.In the design, PLL exports the LO signals of 1.7GHz, and LO signals are sent into two mixing simultaneously
Device can control frequency mixer by programmable bus, two frequency mixers is made to work at the same time or work respectively.When down coversion,
The wifi signals of 2.4GHz are sent into RFFC2071A frequency converters, warp from the ends RF1 by the first balanced-unbalanced transformation input circuit
1 shift frequency of oversampling circuit internal mixers converts output circuit to 700MHz, using the first balanced-unbalanced and is exported from IF1；Upper change
When frequency, the wifi signals of 700MHz are sent into RFFC2071A frequency conversions from the ends IF2 by the second balanced-unbalanced transformation input circuit
Device road, it is defeated by RF2 using the second balanced-unbalanced transformation output circuit through 2 shift frequency of oversampling circuit internal mixers to 2.4GHz
Go out.
As shown in figure 4, a kind of broadcasting and TV wifi communication systems of the present invention, including a digital transmitting and receiving processing module, Yi Zhukou
Receives link, a main mouth transmitting link, one auxiliary mouthful of receives link, an auxiliary mouth transmitting link, two first sound tables (2.4G sound table), one
Frequency conversion amplifying circuit, a main switching switch, one main mouthful of antenna, an auxiliary switching switch (SW) and one auxiliary mouthful of antenna, further include two strings
Row programmable bus, the frequency conversion amplifying circuit include two frequency converters based on RFFC2071A, two low-noise amplifiers, two
Two sound tables (700M sound table), two bandpass filters and two power amplifiers, the digital transmitting and receiving processing module can serially be compiled by two
Journey bus is connected with two frequency converters based on RFFC2071A respectively；
The digital transmitting and receiving processing module emit that link is connected to a frequency converter based on RFFC2071A by main mouth the
First output end of one input terminal, the frequency converter based on RFFC2071A passes sequentially through a rising tone table and a power amplifier
It is connected to main switching switch, the main switching switch passes sequentially through a bandpass filter and a low-noise amplifier is connected to and is based on
The second output terminal of second input terminal of the frequency converter of RFFC2071A, the frequency converter based on RFFC2071A passes sequentially through one
First sound table and main mouth receives link are connected to digital transmitting and receiving processing module, and the main switching switch is additionally coupled to main mouth antenna；
The digital transmitting and receiving processing module emits link by auxiliary mouth and is connected to another frequency converter based on RFFC2071A
First output end of first input end, the frequency converter based on RFFC2071A passes sequentially through another rising tone table and another work(
Electric discharge road is connected to auxiliary switching switch, and the auxiliary switching switch passes sequentially through another bandpass filter and another low-noise amplifier
It is connected to the second input terminal of the frequency converter based on RFFC2071A, the second output terminal of the frequency converter based on RFFC2071A
It passes sequentially through another first sound table and auxiliary mouth receives link is connected to digital transmitting and receiving processing module, the auxiliary switching switch is also connected with
To auxiliary mouth antenna；
Each frequency converter based on RFFC2071A includes a master chip circuit, a serial programmable bus and hardware
Control port circuit, a power supply circuit, a logical address identification circuit, a noise suppression circuit, one first balanced-unbalanced become
Change input circuit, one first balanced-unbalanced transformation output circuit, one second balanced-unbalanced transformation input circuit, one second
Balanced-unbalanced converts output circuit, a loop filter circuit and a fault warning circuit, and the master chip circuit includes a core
The first pin of the model RFFC2071A, the chip U15 of piece U15, the chip U15, the 9th pin, the 29th are drawn
Foot, the 30th pin, the 31st pin and the 32nd pin are connected to serial programmable bus and hardware controls port
Circuit, the 13rd pin and the 14th pin of the chip U15 are connected to the first balanced-unbalanced transformation input circuit, institute
It states the 15th pin of chip U15 and the 16th pin is connected to logical address identification circuit, the 17th of the chip U15 draws
Foot and the 18th pin are connected to the first balanced-unbalanced transformation output circuit, the 5th pin of the chip U15, the 19th
Pin and the 22nd pin are connected to power supply circuit, the 23rd pin of the chip U15 and the connection of the 24th pin
Input circuit is converted to the second balanced-unbalanced, and the 27th pin and the 28th pin of the chip U15 are connected to the
Two balanced-unbalanceds convert output circuit, and the 4th pin of the chip U15 is connected to noise suppression circuit, the chip U15
The 12nd pin and the 33rd pin ground connection；The 6th pin, the 7th pin and the 8th pin of the chip U15, which corresponds to, to be connected
The port of loop filter circuit is connect, the 26th pin of the chip U15 is connected to the port of fault warning circuit；
The main mouth transmitting link and auxiliary mouth transmitting link respectively corresponding on two frequency converters based on RFFC2071A the
One balanced-unbalanced convert input circuit input terminal connection, two rising tone tables respectively with two changes based on RFFC2071A
The output end connection of corresponding first balanced-unbalanced transformation output circuit on frequency device, two low-noise amplifiers respectively with
The input terminal connection of corresponding second balanced-unbalanced transformation input circuit on two frequency converters based on RFFC2071A, described in two
The second balanced-unbalanced corresponding on two frequency converters based on RFFC2071A converts the defeated of output circuit to first sound table respectively
Outlet connects；The two serial programmable buses respectively with to correspond to serial programmable on two frequency converters based on RFFC2071A total
Line is connect with the port of hardware controls port circuit, and serial programmable bus connects serial programmable bus and hardware controls port
The bus of the port " ENBL " of circuit, " MODE ", " RESETX ", 2 RFFC2071A chips are connected to and can be compiled by the way of in parallel
On journey logical device；Wherein one frequency converter based on RFFC2071A further includes an external crystal oscillating circuit, the external crystal oscillator
Circuit is connect with the tenth pin of chip U15 on two frequency converters based on RFFC2071A respectively, and 2 RFFC2071A chips share
1 external crystal oscillating circuit so that the clock signal on 2 tunnels in MIMO circuits WIFI is consistent.
By taking main mouth as an example：Main mouth transmitting link output meets the port J16 in the first balanced-unbalanced transformation input circuit
(RF1), the rising tone table of 700M meets the port J17 (IF1) in the first balanced-unbalanced transformation output circuit；Low noise amplification
Device (LNA) output meets the port J18 (IF2) in the second balanced-unbalanced transformation input circuit；The first sound table of 2.4G connects second
Balanced-unbalanced converts the port J14 (RF2) in output circuit.Equally, the connection type of auxiliary mouth is as main mouth.
The frequency converter of RFFC2071A is in MIMO broadcasting and TV 700M communication system applications as shown in figure 4, digital transmitting and receiving processing module
Generate two-way wifi signals, while in digital transmitting and receiving processing module programmable logic cells passed through according to wifi clock signals it is serial
Programmable bus allow 2 RFFC2071A frequency converter in down coversion mixer tube work, the mixer tube of up-conversion do not work.Make
Wifi signals realize 2.4GHz to 700MHz radiofrequency signal shift frequencies, frequency conversion list by emitting the frequency converter of the RFFC2071A of link
The wifi signals of 700MHz carry out wireless coverage after power amplification filters by mimo antenna after first frequency conversion.Receives link is then
By the wifi signals of mimo antenna reception space 700MHz, data-signal, then received unit are received through signal shift switch
Realize the converter unit that RFFC2071A is sent into after signal reception is handled, at this moment programmable logic list in digital transmitting and receiving processing module
Member allowed by serial programmable bus according to wifi clock signals 2 RFFC2071A frequency converter in up-conversion mixing plumber
Make, the mixer tube of down coversion does not work.Wifi signals are realized by 700MHz shift frequencies to 2.4GHz frequency bands, then by digital transmitting and receiving core
Piece carries out data processing.The local frequency of the frequency converter of RFFC2071A can be changed by serial programmable bus simultaneously, it is real
The demand of existing broadcasting and TV full frequency band 470~860MHz shift frequencies meets frequency range that the super wifi of CHINA RFTCOM Co Ltd is covered in different regions not
Same demand.It can relatively be obtained by Fig. 4 and Fig. 2：After MIMO broadcasting and TV 700M communication systems are using the frequency converter of RFFC2071A,
So that product is highly integrated, small size, circuit are easy to debug, low-power consumption.
In conclusion present invention could apply to the indoor and outdoor covering product of each frequency range in mobile communication, it is particularly suitable for
Broadcasting and TV " internet+" are realized in the application of the super wifi products of MIMO CHINA RFTCOM Co Ltd.Its advantage is as follows：
1, the frequency converter high integration of RFFC2071A, it is small, 2 mixing in circuit can be allowed by programmable bus
Device works respectively, reduces power consumption, and the operating mode of the frequency mixer cooperation wifi signals TDD in the frequency converter of RFFC2071A makes production
Product realize low-power consumption；Particularly suitable for the communication pattern of TDD, FDD, wireless wifi, LTE terminal product can be widely applied to
In；Can also not influence system performance index, by change mixer tube operating current work in by frequency changer circuit it is low
Power consumption mode, the high integration of the frequency converter of RFFC2071A, good performance indicator, accurately frequency stability, keeps MIMO wide
The super wifi products of electricity realize that miniaturization, high stability, low cost are suitble to product to realize miniaturization, environmental protection.
2, the frequency converter of RFFC2071A has radio frequency operation frequency range：30M~2700MHz, VCO frequency range：85M~
2700MHz, so wide working frequency range can almost meet the needs of each channel of civilian mobile communication is with broadcasting and TV full frequency band, and utilize
Software and radio technique realizes that flexible each channel configuration, using in mobile communication frequency conversion product, is convenient for convenient for making modularization
Material high-volume is purchased, and so as to shorten the period of research and development of products and production, reduces product cost.
3, the frequency converter of RFFC2071A has temperature-compensating in -40 DEG C~+85 DEG C temperature ranges, internal VCO so that
Frequency changer circuit still keeps accurately frequency stability in temperature change, greatly reduces since temperature change frequency converter generates
Frequency deviation, avoid wifi signals from being influenced by frequency deviation so that rate decline.
4, the good circuit characteristic of the frequency converter of RFFC2071A and performance indicator provide optimal set for product design
Meter scheme, shortens the R＆D cycle.
Although specific embodiments of the present invention have been described above, those familiar with the art should manage
Solution, we are merely exemplary described specific embodiment, rather than for the restriction to the scope of the present invention, it is familiar with this
The technical staff in field modification and variation equivalent made by the spirit according to the present invention, should all cover the present invention's
In scope of the claimed protection.
Claims (6)
1. a kind of frequency converter based on RFFC2071A, it is characterised in that：The frequency converter based on RFFC2071A includes a master
Chip circuit, a serial programmable bus and hardware controls port circuit, an external crystal oscillating circuit, a power supply circuit, a logic
Address recognition circuit, a noise suppression circuit, one first balanced-unbalanced transformation input circuit, one first balanced-unbalanced become
Output circuit, one second balanced-unbalanced transformation input circuit and one second balanced-unbalanced transformation output circuit are changed, it is described
Master chip circuit includes the model RFFC2071A of chip a U15, the chip U15, the first pin of the chip U15,
It is total that nine pins, the 29th pin, the 30th pin, the 31st pin and the 32nd pin are connected to serial programmable
Line and hardware controls port circuit, the tenth pin of the chip U15 are connected to external crystal oscillating circuit, and the of the chip U15
13 pins and the 14th pin are connected to the first balanced-unbalanced transformation input circuit, the 15th pin of the chip U15
And the 16th pin be connected to logical address identification circuit, the 17th pin and the 18th pin of the chip U15 are connected to
First balanced-unbalanced converts output circuit, and the 5th pin, the 19th pin and the 22nd pin of the chip U15 connect
It is connected to power supply circuit, the 23rd pin and the 24th pin of the chip U15 are connected to the transformation of the second balanced-unbalanced
Input circuit, the 27th pin and the 28th pin of the chip U15 are connected to the transformation output of the second balanced-unbalanced
4th pin of circuit, the chip U15 is connected to noise suppression circuit, the 12nd pin and the 30th of the chip U15
Three pins are grounded.
2. a kind of frequency converter based on RFFC2071A as described in claim 1, it is characterised in that：It is described to be based on RFFC2071A
Frequency converter further include a loop filter circuit, the port of the loop filter circuit is drawn with the 6th of the chip U15 the respectively
Foot, the 7th pin and the 8th pin are correspondingly connected with.
3. a kind of frequency converter based on RFFC2071A as described in claim 1, it is characterised in that：It is described to be based on RFFC2071A
Frequency converter further include a fault warning circuit, the port of the fault warning circuit is drawn with the 26th of the chip U15
Foot connects.
4. a kind of broadcasting and TV wifi communication systems, including a digital transmitting and receiving processing module, one main mouthful of receives link, one main mouthful of transmitting chain
Road, one auxiliary mouthful of receives link, an auxiliary mouth transmitting link, two first sound tables, a frequency conversion amplifying circuit, a main switching switch, a master
Mouth antenna, an auxiliary switching switch and one auxiliary mouthful of antenna, it is characterised in that：Further include two serial programmable buses, the frequency conversion is put
Big circuit includes two frequency converter, two low-noise amplifiers, two rising tone tables, two bandpass filters and two based on RFFC2071A
Power amplifier, the digital transmitting and receiving processing module by two serial programmable buses respectively with two frequency conversions based on RFFC2071A
Device is connected；
The digital transmitting and receiving processing module emits link by main mouth and is connected to the first defeated of a frequency converter based on RFFC2071A
Enter end, the first output end of the frequency converter based on RFFC2071A passes sequentially through a rising tone table and power amplifier connection
It is switched to main switching, the main switching switch passes sequentially through a bandpass filter and a low-noise amplifier is connected to and is based on
The second output terminal of second input terminal of the frequency converter of RFFC2071A, the frequency converter based on RFFC2071A passes sequentially through one
First sound table and main mouth receives link are connected to digital transmitting and receiving processing module, and the main switching switch is additionally coupled to main mouth antenna；
The digital transmitting and receiving processing module emits link by auxiliary mouth and is connected to the first of another frequency converter based on RFFC2071A
First output end of input terminal, the frequency converter based on RFFC2071A passes sequentially through another rising tone table and another power amplifier electricity
Road is connected to auxiliary switching switch, and the auxiliary switching switch passes sequentially through another bandpass filter and the connection of another low-noise amplifier
To the second input terminal of the frequency converter based on RFFC2071A, the second output terminal of the frequency converter based on RFFC2071A is successively
It is connected to digital transmitting and receiving processing module by another first sound table and auxiliary mouth receives link, the auxiliary switching switch is additionally coupled to auxiliary
Mouth antenna；
Each frequency converter based on RFFC2071A includes a master chip circuit, a serial programmable bus and hardware controls
Port circuit, a power supply circuit, a logical address identification circuit, a noise suppression circuit, the transformation of one first balanced-unbalanced are defeated
It is flat to enter circuit, one first balanced-unbalanced transformation output circuit, one second balanced-unbalanced transformation input circuit and one second
Weighing apparatus-unbalanced transformation output circuit, the master chip circuit include a chip U15, the model of the chip U15
The first pin, the 9th pin, the 29th pin, the 30th pin, the 31st pin of RFFC2071A, the chip U15
And the 32nd pin be connected to serial programmable bus and hardware controls port circuit, the 13rd of the chip U15 draws
Foot and the 14th pin are connected to the first balanced-unbalanced transformation input circuit, the 15th pin and the tenth of the chip U15
Six pins are connected to logical address identification circuit, and it is flat that the 17th pin and the 18th pin of the chip U15 are connected to first
Weighing apparatus-unbalanced transformation output circuit, the 5th pin, the 19th pin and the 22nd pin of the chip U15 are connected to confession
Circuit, the 23rd pin and the 24th pin of the chip U15 are connected to the second balanced-unbalanced transformation input electricity
Road, the 27th pin and the 28th pin of the chip U15 are connected to the second balanced-unbalanced transformation output circuit,
The 4th pin of the chip U15 is connected to noise suppression circuit, the 12nd pin and the 33rd pin of the chip U15
Ground connection；
The main mouth transmitting link and auxiliary mouth transmitting link are flat on two frequency converters based on RFFC2071A corresponding first respectively
The input terminal of weighing apparatus-unbalanced transformation input circuit connects, two rising tone tables respectively with two frequency converters based on RFFC2071A
The output end connection of upper corresponding first balanced-unbalanced transformation output circuit, two low-noise amplifiers respectively with two bases
The input terminal that input circuit is converted in corresponding second balanced-unbalanced on the frequency converter of RFFC2071A connects, and two described first
The output end of sound table corresponding on two frequency converters based on RFFC2071A the second balanced-unbalanced transformation output circuit respectively
Connection；The two serial programmable buses corresponded to respectively on two frequency converters based on RFFC2071A serial programmable bus with
The port of hardware controls port circuit connects；Wherein one frequency converter based on RFFC2071A further includes an external crystal oscillator electricity
Road, the external crystal oscillating circuit are connect with the tenth pin of chip U15 on two frequency converters based on RFFC2071A respectively.
5. a kind of broadcasting and TV wifi communication systems as claimed in claim 4, it is characterised in that：The change based on RFFC2071A
Frequency device further includes a loop filter circuit, the port of the loop filter circuit respectively with the 6th pin of the chip U15,
Seven pins and the 8th pin are correspondingly connected with.
6. a kind of broadcasting and TV wifi communication systems as claimed in claim 4, it is characterised in that：The change based on RFFC2071A
Frequency device further includes a fault warning circuit, and the port of the fault warning circuit and the 26th pin of the chip U15 connect
It connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810299183.XA CN108390695A (en) | 2018-04-04 | 2018-04-04 | A kind of frequency converter and broadcasting and TV wifi communication systems based on RFFC2071A |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810299183.XA CN108390695A (en) | 2018-04-04 | 2018-04-04 | A kind of frequency converter and broadcasting and TV wifi communication systems based on RFFC2071A |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108390695A true CN108390695A (en) | 2018-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810299183.XA Pending CN108390695A (en) | 2018-04-04 | 2018-04-04 | A kind of frequency converter and broadcasting and TV wifi communication systems based on RFFC2071A |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102388659A (en) * | 2009-02-20 | 2012-03-21 | 贝拉尔网络公司 | System and method for frequency offsetting of information communicated in MIMO-based wireless networks |
| CN203691643U (en) * | 2014-01-22 | 2014-07-02 | 江苏杰瑞科技集团有限责任公司 | WiMAX wireless client device |
| CN104283579A (en) * | 2014-10-21 | 2015-01-14 | 成都天奥信息科技有限公司 | Dual-band handheld to-air radio station |
| CN207947772U (en) * | 2018-04-04 | 2018-10-09 | 福建新大陆通信科技股份有限公司 | A kind of frequency converter and broadcasting and TV wifi communication systems based on RFFC2071A |
-
2018
- 2018-04-04 CN CN201810299183.XA patent/CN108390695A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102388659A (en) * | 2009-02-20 | 2012-03-21 | 贝拉尔网络公司 | System and method for frequency offsetting of information communicated in MIMO-based wireless networks |
| CN203691643U (en) * | 2014-01-22 | 2014-07-02 | 江苏杰瑞科技集团有限责任公司 | WiMAX wireless client device |
| CN104283579A (en) * | 2014-10-21 | 2015-01-14 | 成都天奥信息科技有限公司 | Dual-band handheld to-air radio station |
| CN207947772U (en) * | 2018-04-04 | 2018-10-09 | 福建新大陆通信科技股份有限公司 | A kind of frequency converter and broadcasting and TV wifi communication systems based on RFFC2071A |
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| RFMD: "RFFC2071数据手册Datasheet PDF", 《HTTPS://WWW.FINDIC.COM/DOC/BROWSER/VQZ8KVADE?DOC_ID=9446332#LOCALE=ZH-CN》, pages 1 - 14 * |
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