CN106899321A - A kind of digital intercom terminal and its impedance matching methods - Google Patents
A kind of digital intercom terminal and its impedance matching methods Download PDFInfo
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- CN106899321A CN106899321A CN201710005174.0A CN201710005174A CN106899321A CN 106899321 A CN106899321 A CN 106899321A CN 201710005174 A CN201710005174 A CN 201710005174A CN 106899321 A CN106899321 A CN 106899321A
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- radio frequency
- mobile radio
- transmitter unit
- impedance
- frequency mobile
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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
-
- 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
- H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
-
- 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
- H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
Abstract
The invention provides a kind of digital intercom terminal and its impedance matching methods, it includes the integrated talkback chip for possessing zero intermediate frequency digital communication functions, micro-control unit in integrated talkback chip is when intercom works, the output impedance of radio frequency mobile radio receiver transmitter unit is adjusted first, so that the output impedance of radio frequency mobile radio receiver transmitter unit and the impedance matching for loading, then the input impedance of radio frequency mobile radio receiver transmitter unit is adjusted, so that the input impedance of radio frequency mobile radio receiver transmitter unit and the impedance matching of signal source；Can thus realize that any frequency band signals are received, and all possess low noise acoustic matching and efficient energy transmission, solve the problems, such as existing support wide-band reception can not realize low noise and efficient energy transmission to digital handset receiving front-end.
Description
Technical field
The present invention relates to digital intercom field, more particularly to a kind of digital intercom terminal and its impedance matching methods.
Background technology
In existing intercommunication field, after the impedance needs of low-noise amplifier carry out impedance matching with signal source and load,
Can guarantee that digital handset receiving front-end realizes that minimal noise is matched, but in the prior art, digital handset is all to support
A kind of signal transmitting and receiving of frequency range, the impedance of its low-noise amplifier is already set as optimal impedance and can not adjust.
Existing one-segment can not meet signal transmitting and receiving needs of the user to wide-band, therefore existing skill to digital handset
Art provide support wide-band transmitting-receiving to digital handset, for this support wide-band receive to digital handset, such as
What realizes low noise acoustic matching and the transmission of efficient energy, is technical problem urgently to be resolved hurrily.
The content of the invention
The invention provides a kind of digital intercom terminal and its impedance matching methods, received with solving existing support wide-band
Digital handset receiving front-end can not be realized low noise and efficient energy transmission problem.
The invention provides a kind of digital intercom terminal for supporting wide-band to receive and dispatch, including：Power supply and possess in zero
The integrated talkback chip of frequency digital communication functions, power supply is integrated talkback chip power supply；Integrated talkback chip includes micro-control
Unit processed and radio frequency mobile radio receiver transmitter unit, radio frequency mobile radio receiver transmitter unit are used to adopt
Received and dispatched with realizing wide band signals with low pressure broadband voltage controlled technical finesse data；Radio frequency mobile radio receiver transmitter unit
Connecting signal source and load；Micro-control unit is used for the output resistance of adjustment radio frequency mobile radio receiver transmitter unit first
It is anti-so that the output impedance of radio frequency mobile radio receiver transmitter unit and the impedance matching of load, then adjust radio frequency
The input impedance of mobile radio receiver transmitter unit so that the input of radio frequency mobile radio receiver transmitter unit
Impedance and the impedance matching of signal source.
Further, integrated talkback chip power supply also includes digital signal processing unit, and digital signal processing unit is used for
Reflected signal between collection radio frequency mobile radio receiver transmitter unit and signal source and load, and reflected signal is passed
Transport to micro-control unit；Micro-control unit is used to adjust radio frequency mobile radio reception according to the reflected signal strength of reflected signal
The output impedance of machine transmitter unit and input impedance.
Further, digital signal processing unit is used to gather radio frequency mobile radio receiver transmitter unit with load
Between reflected signal S22, and reflected signal S22 is transmitted to micro-control unit, micro-control unit is used for according to reflected signal
The signal reflex intensity and the first preset value of S22, using step by step fine setting impedance values by the way of or table look-up determination output resistance
The mode of anti-adjusted value, adjusts the output impedance of radio frequency mobile radio receiver transmitter unit, until reflected signal S22
Signal reflex intensity is not more than the first preset value.
Further, digital signal processing unit is used to gather radio frequency mobile radio receiver transmitter unit and signal
Reflected signal S11 between source, and reflected signal S11 is transmitted to micro-control unit, micro-control unit is used to be believed according to reflection
The signal reflex intensity and the second preset value of number S11, by the way of fine setting input impedance value step by step or determination input of tabling look-up
The mode of impedance adjustment value, adjusts the input impedance of radio frequency mobile radio receiver transmitter unit, until reflected signal S11
Signal reflex intensity be not more than the second preset value.
Further, radio frequency mobile radio receiver transmitter unit includes low-noise amplifier and resonator, resonance
Device includes input resistant matching network and output impedance matching networks；Low-noise amplifier passes through input resistant matching network connection
Signal source, is connected by output impedance matching networks and loaded, and micro-control unit is used to adjust output impedance matching networks first, makes
Low-noise amplifier with load impedance matching, then adjust input resistant matching network so that low-noise amplifier with letter
The impedance matching in number source.
The invention provides a kind of impedance matching methods of the digital intercom terminal for supporting wide-band to receive and dispatch, digital intercom end
End includes power supply and possesses the integrated talkback chip of zero intermediate frequency digital communication functions, and power supply is integrated talkback chip
Power supply；Integrated talkback chip includes micro-control unit and radio frequency mobile radio receiver transmitter unit, radio frequency movement nothing
Line electricity receiver transmitter unit is used to use low pressure broadband voltage controlled technical finesse data to realize that wide band signals are received and dispatched；Radio frequency
Mobile radio receiver transmitter unit connecting signal source and load；Method of work includes：
Micro-control unit adjusts the output impedance of radio frequency mobile radio receiver transmitter unit, until radio frequency movement nothing
The output impedance of line electricity receiver transmitter unit and the impedance matching of load；
Micro-control unit adjusts the input impedance of radio frequency mobile radio receiver transmitter unit, until radio frequency movement nothing
The input impedance of line electricity receiver transmitter unit and the impedance matching of signal source.
Further, integrated talkback chip power supply also includes digital signal processing unit, and impedance matching methods also include：
Digital signal processing unit is gathered between radio frequency mobile radio receiver transmitter unit and signal source and load
Reflected signal, and reflected signal is transmitted to micro-control unit；
Micro-control unit adjusts radio frequency mobile radio receiver emitter list according to the reflected signal strength of reflected signal
The output impedance of unit and input impedance.
Further, digital signal processing unit collection radio frequency mobile radio receiver transmitter unit and signal source and
Reflected signal between load, and reflected signal is transmitted to micro-control unit include：Digital signal processing unit gathers radio frequency
Reflected signal S22 between mobile radio receiver transmitter unit and load, and reflected signal S22 is transmitted to microcontroller
Unit；Micro-control unit adjusts radio frequency mobile radio receiver transmitter unit according to the reflected signal strength of reflected signal
Output impedance and input impedance include：Micro-control unit is adopted according to the signal reflex intensity and the first preset value of reflected signal S22
With the mode of the mode of fine setting impedance values or determination output impedance adjusted value of tabling look-up step by step, radio frequency mobile wireless is adjusted
The output impedance of electric receiver transmitter unit, until the signal reflex intensity of reflected signal S22 is not more than the first preset value.
Further, digital signal processing unit collection radio frequency mobile radio receiver transmitter unit and signal source and
Reflected signal between load, and reflected signal is transmitted to micro-control unit include：Digital signal processing unit gathers radio frequency
Reflected signal S11 between mobile radio receiver transmitter unit and signal source, and reflected signal S11 is transmitted to micro-control
Unit processed；Micro-control unit adjusts radio frequency mobile radio receiver transmitter unit according to the reflected signal strength of reflected signal
Output impedance and input impedance include：Micro-control unit is used for pre- according to the signal reflex intensity of reflected signal S11 and second
If value, using step by step fine setting input impedance value by the way of or table look-up determine input impedance adjusted value mode, adjustment radio frequency move
The input impedance of dynamic radio receiver transmitter unit, until the signal reflex intensity of reflected signal S11 to be not more than second pre-
If value.
Further, radio frequency mobile radio receiver transmitter unit includes low-noise amplifier and resonator, resonance
Device includes input resistant matching network and output impedance matching networks；Low-noise amplifier passes through input resistant matching network connection
Signal source, is connected by output impedance matching networks and loaded；
Micro-control unit adjusts the output impedance of radio frequency mobile radio receiver transmitter unit, until radio frequency movement nothing
The output impedance of line electricity receiver transmitter unit includes with the impedance matching of load：Micro-control unit adjustment output impedance matching
Network so that low-noise amplifier and the impedance matching for loading；
Micro-control unit adjusts the input impedance of radio frequency mobile radio receiver transmitter unit, until radio frequency movement nothing
The input impedance of line electricity receiver transmitter unit includes with the impedance matching of signal source：Micro-control unit adjusts input impedance
Distribution network so that the impedance matching of low-noise amplifier and signal source.
Beneficial effects of the present invention：
The invention provides a kind of new digital intercom terminal and its impedance matching methods, it includes possessing zero intermediate frequency numeral
The integrated talkback chip of communication function, the micro-control unit in integrated talkback chip adjusts radio frequency first when intercom works
The output impedance of mobile radio receiver transmitter unit so that the output of radio frequency mobile radio receiver transmitter unit
Impedance and the impedance matching of load, then adjust the input impedance of radio frequency mobile radio receiver transmitter unit so that penetrate
The input impedance of frequency mobile radio receiver transmitter unit and the impedance matching of signal source；Any frequency can thus be realized
Segment signal is received and dispatched, and all possesses efficient energy transmission, solves being connect to digital handset for existing support wide-band transmitting-receiving
Receiving front end can not realize the problem of low noise and efficient energy transmission.
Brief description of the drawings
The structural representation of the digital intercom terminal that Fig. 1 is provided for first embodiment of the invention；
The structural representation of the radio frequency mobile radio receiver transmitter unit that Fig. 2 is provided for first embodiment of the invention
Figure；
The flow chart of the impedance matching methods that Fig. 3 is provided for second embodiment of the invention；
The structure connection figure of the integrated talkback chip that Fig. 4 is provided for third embodiment of the invention；
The circuit connection diagram of the integrated talkback chip that Fig. 5 is related to for third embodiment of the invention；
The flow chart of the impedance matching methods that Fig. 6 is provided for third embodiment of the invention.
Specific embodiment
The further annotation explanation of output is now done to the present invention by way of specific embodiment combination accompanying drawing.
First embodiment：
The structural representation of the digital intercom terminal that Fig. 1 is provided for first embodiment of the invention, as shown in Figure 1, in this reality
Apply in example, the digital intercom terminal that the present invention is provided includes：Power supply 11 and possess the integrated of zero intermediate frequency digital communication functions
Intercommunication chip 12, power supply 11 is powered for integrated talkback chip 12；Integrated talkback chip 12 include micro-control unit 121 and
Radio frequency mobile radio receiver transmitter unit 122, radio frequency mobile radio receiver transmitter unit 122 is used for using low
Pressure broadband voltage controlled technical finesse data are received and dispatched with realizing wide band signals；Radio frequency mobile radio receiver transmitter unit 122
Connecting signal source 2 and load 3；Micro-control unit 121 is used for adjustment radio frequency mobile radio receiver transmitter unit 122 first
Output impedance so that the impedance matching of the output impedance of radio frequency mobile radio receiver transmitter unit 122 and load 3,
Then the input impedance of adjustment radio frequency mobile radio receiver transmitter unit 122 so that radio frequency mobile radio receiver
The input impedance of transmitter unit 122 and the impedance matching of signal source 2.In actual applications, the application is directed to radio frequency movement
What the LNA modules of radio receiver transmitter unit were improved, LNA modules connection antenna and demodulation module, mainly by day
The small-signal that line is received is amplified；Micro-control unit is used to adjust input and the output impedance of LNA modules, makes up to minimum
Noise matching.
As shown in Fig. 2 in certain embodiments, the radio frequency mobile radio receiver transmitter unit in above-described embodiment
122, specifically for LNA modules include low-noise amplifier 21 and resonator 22, resonator 22 includes input resistant matching network
221 and output impedance matching networks 222；Low-noise amplifier 21 is led to by the connecting signal source 2 of input resistant matching network 221
Cross the connection of output impedance matching networks 222 load 3；Micro-control unit 121 is used to adjust output impedance matching networks 222 first,
So that low-noise amplifier 21 and the impedance matching of load 3, then adjust input resistant matching network 221 so that low noise is put
The impedance matching of big device 21 and signal source 2.
As shown in figure 4, in certain embodiments, the integrated talkback chip power supply in above-described embodiment is included at data signal
Reason unit, digital signal processing unit is used to gather radio frequency mobile radio receiver transmitter unit and signal source and loads it
Between reflected signal, and reflected signal is transmitted to micro-control unit.
In certain embodiments, the digital signal processing unit in above-described embodiment connects for gathering radio frequency mobile radio
Reflected signal S22 between receipts machine transmitter unit and load, and reflected signal S22 is transmitted to micro-control unit, microcontroller
Unit is used for signal reflex intensity and the first preset value according to reflected signal S22, adjustment radio frequency mobile radio receiver hair
The output impedance of machine unit is penetrated, until the output impedance of radio frequency mobile radio receiver transmitter unit and the impedance for loading
Match somebody with somebody.
In certain embodiments, the micro-control unit in above-described embodiment is used to adjust radio frequency mobile radio receiver hair
The output impedance of machine unit is penetrated, until the signal reflex intensity of reflected signal S22 is not more than preset value.
In certain embodiments, the micro-control unit in above-described embodiment is used for by the way of finely tuning step by step or looks into
Table determines the mode of adjusted value, adjusts the output impedance of radio frequency mobile radio receiver transmitter unit.
In certain embodiments, the digital signal processing unit in above-described embodiment connects for gathering radio frequency mobile radio
Reflected signal S11 between receipts machine transmitter unit and signal source, and reflected signal S11 is transmitted to micro-control unit, micro-control
Unit processed is used for signal reflex intensity and the second preset value according to reflected signal S11, adjusts radio frequency mobile radio receiver
The input impedance of transmitter unit, until the input impedance of radio frequency mobile radio receiver transmitter unit and the resistance of signal source
Anti- matching.
In certain embodiments, the micro-control unit in above-described embodiment is used to adjust radio frequency mobile radio receiver hair
The input impedance of machine unit is penetrated, until the signal reflex intensity of reflected signal S11 is not more than preset value.
In certain embodiments, the micro-control unit in above-described embodiment is used for by the way of finely tuning step by step or looks into
Table determines the mode of adjusted value, adjusts the input impedance of radio frequency mobile radio receiver transmitter unit.
It is corresponding, the invention provides a kind of digital handset, its digital intercom terminal for including present invention offer.
A kind of new digital intercom terminal is present embodiments provided, it includes possessing the integrated of zero intermediate frequency digital communication functions
Intercommunication chip, the micro-control unit in integrated talkback chip adjusts radio frequency mobile radio reception first when intercom works
The output impedance of machine transmitter unit so that the output impedance of radio frequency mobile radio receiver transmitter unit and the resistance for loading
Anti- matching, then adjusts the input impedance of radio frequency mobile radio receiver transmitter unit so that radio frequency mobile radio connects
The input impedance of receipts machine transmitter unit and the impedance matching of signal source；Any frequency band signals transmitting-receiving can be thus realized, and
And all possess efficient energy transmission, solve can not being realized to digital handset receiving front-end for existing support wide-band transmitting-receiving
Low noise and the problem of efficient energy transmission.
Second embodiment：
The impedance matching side of the digital intercom terminal of the support wide-band transmitting-receiving that Fig. 3 is provided for second embodiment of the invention
Method, digital intercom terminal includes power supply and possesses the integrated talkback chip of zero intermediate frequency digital communication functions, and power supply is
Integrated talkback chip power supply；Integrated talkback chip includes micro-control unit and radio frequency mobile radio receiver emitter list
Unit, radio frequency mobile radio receiver transmitter unit is used to use low pressure broadband voltage controlled technical finesse data to realize wide-band
Signal transmitting and receiving；Radio frequency mobile radio receiver transmitter unit connecting signal source and load；As shown in figure 3, the present embodiment is carried
The impedance matching methods of confession include：
S301：Micro-control unit adjusts the output impedance of radio frequency mobile radio receiver transmitter unit, until radio frequency
The output impedance of mobile radio receiver transmitter unit and the impedance matching for loading；
S302：Micro-control unit adjusts the input impedance of radio frequency mobile radio receiver transmitter unit, until radio frequency
The input impedance of mobile radio receiver transmitter unit and the impedance matching of signal source.
In certain embodiments, the integrated talkback chip power supply in above-described embodiment also includes digital signal processing unit,
Impedance matching methods also include：
Digital signal processing unit is gathered between radio frequency mobile radio receiver transmitter unit and signal source and load
Reflected signal, and reflected signal is transmitted to micro-control unit；
Micro-control unit adjusts radio frequency mobile radio receiver emitter list according to the reflected signal strength of reflected signal
The output impedance of unit and input impedance.
In certain embodiments, the digital signal processing unit collection radio frequency mobile radio receiver in above-described embodiment
Reflected signal between transmitter unit and signal source and load, and reflected signal is transmitted to micro-control unit include：Numeral
Signal processing unit gathers the reflected signal S22 between radio frequency mobile radio receiver transmitter unit and load, and will be anti-
Signal S22 is penetrated to transmit to micro-control unit；Micro-control unit adjusts radio frequency movement nothing according to the reflected signal strength of reflected signal
The output impedance of line electricity receiver transmitter unit and input impedance include：Signal of the micro-control unit according to reflected signal S22
Reflected intensity and the first preset value, using step by step fine setting impedance values by the way of or table look-up determination output impedance adjusted value
Mode, adjust radio frequency mobile radio receiver transmitter unit output impedance, until the signal reflex of reflected signal S22
Intensity is not more than the first preset value.
In certain embodiments, the digital signal processing unit collection radio frequency mobile radio receiver in above-described embodiment
Reflected signal between transmitter unit and signal source and load, and reflected signal is transmitted to micro-control unit include：Numeral
Signal processing unit gathers the reflected signal S11 between radio frequency mobile radio receiver transmitter unit and signal source, and will
Reflected signal S11 is transmitted to micro-control unit；Micro-control unit adjusts radio frequency movement according to the reflected signal strength of reflected signal
The output impedance of radio receiver transmitter unit and input impedance include：Micro-control unit is used for according to reflected signal S11
Signal reflex intensity and the second preset value, using step by step fine setting input impedance value by the way of or determination input impedance of tabling look-up
The mode of adjusted value, adjusts the input impedance of radio frequency mobile radio receiver transmitter unit, until the letter of reflected signal S11
Number reflected intensity is not more than the second preset value.
In certain embodiments, the radio frequency mobile radio receiver transmitter unit in above-described embodiment includes low noise
Amplifier and resonator, resonator include input resistant matching network and output impedance matching networks；Low-noise amplifier passes through
Input resistant matching network connection signal source, is connected by output impedance matching networks and loaded；
Micro-control unit adjusts the output impedance of radio frequency mobile radio receiver transmitter unit, until radio frequency movement nothing
The output impedance of line electricity receiver transmitter unit includes with the impedance matching of load：Micro-control unit adjustment output impedance matching
Network so that low-noise amplifier and the impedance matching for loading；
Micro-control unit adjusts the input impedance of radio frequency mobile radio receiver transmitter unit, until radio frequency movement nothing
The input impedance of line electricity receiver transmitter unit includes with the impedance matching of signal source：Micro-control unit adjusts input impedance
Distribution network so that the impedance matching of low-noise amplifier and signal source.
A kind of impedance matching methods of new digital intercom terminal are present embodiments provided, it is used to include possessing zero intermediate frequency
The digital intercom terminal of the integrated talkback chip of digital communication functions, the micro-control unit in integrated talkback chip is in intercom work
When making, the output impedance of radio frequency mobile radio receiver transmitter unit is adjusted first so that radio frequency mobile radio reception
The output impedance of machine transmitter unit and the impedance matching of load, then adjust radio frequency mobile radio receiver transmitter unit
Input impedance so that the input impedance of radio frequency mobile radio receiver transmitter unit and the impedance matching of signal source；This
Sample can just realize any frequency band signals transmitting-receiving, and all possess efficient energy transmission, solve existing support wide-band and receive
The problem that low noise and efficient energy transmission can not be realized to digital handset receiving front-end of hair.
Further annotation explanation is done to the present invention in conjunction with concrete application scene.
3rd embodiment：
The present embodiment also provides a kind of integrated talkback chip for possessing zero intermediate frequency digital communication functions, including：Numeral letter
Number processing unit, voice signal codec unit, sound output amplifier unit, microphone amplifying circuit unit, Wei Chu
Reason device unit, PMU, memory cell, radio frequency mobile radio receiver transmitter unit and communication data
Interface；Radio frequency mobile radio receiver transmitter unit is used to use low pressure broadband voltage controlled technical finesse data, audio output
Power Amplifier Unit is used for exports audio signal；Microphone amplifying circuit unit is used to receive audio signal；Communication data connects
Mouth receives and dispatches the data signal of at least one type based on bus marco rule, and transmits to microprocessor unit；Microprocessor list
Unit is used to control the work of each device in integrated talkback chip；PMU is used to for external voltage to be converted to other chips
Internals required voltage；Digital signal processing unit, voice signal codec unit, sound output amplifier list
Unit, microphone amplifying circuit unit, microprocessor unit, PMU, memory cell, radio frequency mobile radio reception
Machine transmitter unit and communication data interface are integrated on one chip by system level chip technology.
Wherein, communication data interface includes that CAM interfaces, LCD interfaces, KPD interfaces, I2C interfaces, SPI interface, UART connect
At least one in mouth, USB2.0 interfaces, LED drive interface, PWM interfaces, SD/MMC interfaces, GPIO interface, I2S interfaces.
In certain embodiments, the integrated talkback chip in above-described embodiment also includes FM fm broadcast receiver units,
FM fm broadcast receivers unit is used to receive FM fm broadcast signals；FM fm broadcast receivers unit passes through system level chip
Technology is integrated in integrated talkback chip.
In certain embodiments, the integrated talkback chip in above-described embodiment also includes bluetooth radio receiver/transmitter list
Unit, bluetooth radio receiver/transmitter unit is used for bluetooth；Bluetooth radio receiver/transmitter unit passes through system
Level chip technology Integration ofTechnology is in integrated talkback chip.
Specifically, as shown in figure 4, the integrated talkback chip SOC that the present embodiment is provided includes：Digital Signal Processing DSP is mono-
41,16 voice signal codec units 42 of unit, sound output amplifier unit 43, microphone amplifying circuit unit 44,
32 reduced instruction microprocessor units 45, power management PMU units 46,16MB PSRAM memory cells 47,16MB
FLASH memory unit 48 and radio frequency mobile radio receiver transmitter unit 49, and some unshowned data-interfaces
Deng；Wherein, 16MB PSRAM memory cells 47 can exist simultaneously with 16MB FLASH memories unit 48, it is also possible to only deposit
At one；Radio frequency mobile radio receiver transmitter unit 49 is used for using low pressure (2.4V) wideband (100-500MHz, 700-
1000MHz) to realize the transmitting-receiving of wide band signals, power management (PMU) unit 46 provides the external world to voltage-controlled technical finesse data
Voltage (3.2-4.2V, generally 3.7V) be converted to 1.4V and 2.4V voltages, wherein 1.4V voltages supply Digital Signal Processing
(DSP) unit 41,6MB PSRAM memory cells 47,16MBFLASH memory cells 48 are used, and 2.4V voltages supply other lists
Unit uses.
The circuit of the digital handset that the present embodiment is related to is as shown in figure 5, it includes：DSP unit 41, microprocessor unit
45th, in receiver transmitter unit 49 LNA (low noise amplifier modules, low noise amplifier module), the module
Main front end of undertaking is amplified and frequency-selecting function, has been internally integrated tuner (input load matching network and the load controlled by CPU
Matching network) and high-frequency amplifier；
As shown in fig. 6, the impedance matching methods are comprised the following steps：
Step S601, LNA receives signal, determines signal frequency range S1.
In actual applications, digital handset receives the signal of what frequency range by user's setting, and it is in digital handset
Chip internal has storage, and LNA can obtain signal frequency range S1 from CPU.
Step S602, microprocessor unit recall the corresponding proper fit values of S1 by the mode such as table look-up, and by follow-up
Step control LNA module output impedances reach this matching value, and actually this is a process for coarse regulation.
Step S603, microprocessor unit 45 read the corresponding signal S22 reflected intensitys of frequency range S1 from memory cell
(first preset value is defined first preset value TH1 according to the characteristic impedance of LNA networks, and in the preset value, LNA possesses signal
The minimum effect of noise), compare the size of reflected signal strength D1 and the first preset value TH1.If reflected signal strength D1 is less than
Or equal to preset value TH1, then the minimum condition of representation signal noise has met, and step S605 can be directly performed, with reality
Transimission power under conditions of existing signal noise minimum is maximum；If reflected signal strength D1 is more than preset value TH1, representation signal
The minimum condition of noise is also not reaching to, and performs step S604 so that LNA and the impedance matching of load, reaches signal noise most
Small condition.
In actual applications, 100M -1000M can be divided into n sections, every section commissioning goes out one when chip IC is designed
Individual proper fit value, learns after the frequency that user is set, system recalls corresponding matching value, and user can be near matching value
Make fine setting.
Step S604, microprocessor unit 45 are using by way of finely tuning step by step or tabling look-up and determine the side of adjusted value
Formula, adjusts the output impedance of radio frequency mobile radio receiver transmitter unit so that the signal reflex intensity of reflected signal S22
No more than the first preset value, in actual applications, this is a process for micro-adjustment.
Step S605, the sensed signal sources of DSP unit 41 are input into the reflection of the reflected signal S12 to the input signal S11 of LNA
Signal intensity D2, transmits to microprocessor unit 45.
Step S606, microprocessor unit 45 read the corresponding signal S12 reflected intensitys of frequency range S1 from memory cell
(second preset value is defined second preset value TH2 according to the characteristic impedance of LNA networks, and in the preset value, LNA possesses most preferably
Efficient energy laser propagation effect, its set-up mode is identical with the first preset value), compare reflected signal strength D2 and preset value
The size of TH2.If reflected signal strength D2 is less than or equal to preset value TH2, the LNA under representation signal noise minimal condition
Transimission power maximum has met, the flow of Auto-matching impedance can be terminated, realize signal noise minimum under conditions of
Transimission power is maximum；If reflected signal strength D2 is more than preset value TH2, the LNA transmission under representation signal noise minimal condition
Power maximum is also not reaching to, and performs step S607 so that LNA and the impedance matching of signal source, reaches signal noise minimum bar
LNA transimission powers under part are maximum.
Step S607, microprocessor unit 45 are using by way of finely tuning step by step or tabling look-up and determine the side of adjusted value
Formula, adjusts the input impedance of radio frequency mobile radio receiver transmitter unit so that the signal reflex intensity of reflected signal S12
D2 is not more than the second preset value, maximum to complete the LNA transimission powers under signal noise minimal condition.
In summary, by implementation of the invention, at least there is following beneficial effect：
The invention provides a kind of new digital intercom terminal and its impedance matching methods, it includes possessing zero intermediate frequency numeral
The integrated talkback chip of communication function, the micro-control unit in integrated talkback chip adjusts radio frequency first when intercom works
The output impedance of mobile radio receiver transmitter unit so that the output of radio frequency mobile radio receiver transmitter unit
Impedance and the impedance matching of load, then adjust the input impedance of radio frequency mobile radio receiver transmitter unit so that penetrate
The input impedance of frequency mobile radio receiver transmitter unit and the impedance matching of signal source；Any frequency can thus be realized
Segment signal is received and dispatched, and all possesses efficient energy transmission, solves being connect to digital handset for existing support wide-band transmitting-receiving
Receiving front end can not realize the problem of low noise and efficient energy transmission.
The above is only specific embodiment of the invention, any formal limitation is not done to the present invention, it is every
Any simple modification made to embodiment of above according to technical spirit of the invention, equivalent variations, with reference to or modification, still
Belong to the protection domain of technical solution of the present invention.
Claims (10)
1. it is a kind of support wide-band receive and dispatch digital intercom terminal, it is characterised in that including：Power supply and possesses zero intermediate frequency
The integrated talkback chip of digital communication functions, the power supply is the integrated talkback chip power supply；The integrated talkback core
Piece includes micro-control unit and radio frequency mobile radio receiver transmitter unit, the radio frequency mobile radio receiver hair
Machine unit is penetrated for using low pressure broadband voltage controlled technical finesse data to realize that wide band signals are received and dispatched；The radio frequency mobile wireless
Electric receiver transmitter unit connecting signal source and load；The micro-control unit is used to adjust the radio frequency mobile wireless first
The output impedance of electric receiver transmitter unit so that the output impedance of the radio frequency mobile radio receiver transmitter unit
With the impedance matching of the load, the input impedance of the radio frequency mobile radio receiver transmitter unit is then adjusted, made
Obtain the input impedance of the radio frequency mobile radio receiver transmitter unit and the impedance matching of the signal source.
2. digital intercom terminal as claimed in claim 1, it is characterised in that the integrated talkback chip power supply also includes numeral
Signal processing unit, the digital signal processing unit be used for gather the radio frequency mobile radio receiver transmitter unit with
Reflected signal between the signal source and load, and reflected signal is transmitted to the micro-control unit；The microcontroller list
Unit according to the reflected signal strength of the reflected signal for adjusting the radio frequency mobile radio receiver transmitter unit
Output impedance and input impedance.
3. digital intercom terminal as claimed in claim 2, it is characterised in that the digital signal processing unit is used to gather institute
State the reflected signal S22 between radio frequency mobile radio receiver transmitter unit and the load, and by the reflected signal
S22 is transmitted to the micro-control unit, the micro-control unit be used for according to the signal reflex intensity of the reflected signal S22 and
First preset value, using step by step fine setting impedance values by the way of or table look-up determine output impedance adjusted value mode, adjustment
The output impedance of the radio frequency mobile radio receiver transmitter unit, until the signal reflex of the reflected signal S22 is strong
Degree is not more than first preset value.
4. digital intercom terminal as claimed in claim 2, it is characterised in that the digital signal processing unit is used to gather institute
The reflected signal S11 between radio frequency mobile radio receiver transmitter unit and the signal source is stated, and the reflection is believed
Number S11 is transmitted to the micro-control unit, and the micro-control unit is used for the signal reflex intensity according to the reflected signal S11
And second preset value, by the way of fine setting input impedance value step by step or table look-up and determine the mode of input impedance adjusted value, adjust
The input impedance of the whole radio frequency mobile radio receiver transmitter unit, until the signal reflex of the reflected signal S11
Intensity is not more than second preset value.
5. the digital intercom terminal as described in any one of Claims 1-4, it is characterised in that the radio frequency mobile radio connects
Receipts machine transmitter unit includes low-noise amplifier and resonator, and the resonator includes input resistant matching network and output resistance
Anti- matching network；The low-noise amplifier by signal source described in the input resistant matching network connection, by described defeated
Go out impedance matching network and connect the load, the micro-control unit is used to adjust the output impedance matching networks first, makes
The low-noise amplifier and the impedance matching of the load are obtained, the input resistant matching network is then adjusted so that described
The impedance matching of low-noise amplifier and the signal source.
6. it is a kind of support wide-band receive and dispatch digital intercom terminal impedance matching methods, it is characterised in that the digital intercom
Terminal includes power supply and possesses the integrated talkback chip of zero intermediate frequency digital communication functions, and the power supply is the collection
Into intercommunication chip power supply；The integrated talkback chip includes micro-control unit and radio frequency mobile radio receiver emitter list
Unit, the radio frequency mobile radio receiver transmitter unit is used to use low pressure broadband voltage controlled technical finesse data to realize width
Frequency band signals are received and dispatched；The radio frequency mobile radio receiver transmitter unit connecting signal source and load；The method of work
Including：
The micro-control unit adjusts the output impedance of the radio frequency mobile radio receiver transmitter unit, until described penetrate
The output impedance of frequency mobile radio receiver transmitter unit and the impedance matching of the load；
The micro-control unit adjusts the input impedance of the radio frequency mobile radio receiver transmitter unit, until described penetrate
The input impedance of frequency mobile radio receiver transmitter unit and the impedance matching of the signal source.
7. impedance matching methods as claimed in claim 6, it is characterised in that the integrated talkback chip power supply also includes numeral
Signal processing unit, the impedance matching methods also include：
The digital signal processing unit gather the radio frequency mobile radio receiver transmitter unit and the signal source and
Reflected signal between load, and reflected signal is transmitted to the micro-control unit；
The micro-control unit adjusts the radio frequency mobile radio receiver according to the reflected signal strength of the reflected signal
The output impedance of transmitter unit and input impedance.
8. impedance matching methods as claimed in claim 7, it is characterised in that
The digital signal processing unit gather the radio frequency mobile radio receiver transmitter unit and the signal source and
Reflected signal between load, and reflected signal is transmitted to the micro-control unit include：The digital signal processing unit
The reflected signal S22 between the radio frequency mobile radio receiver transmitter unit and the load is gathered, and will be described anti-
Signal S22 is penetrated to transmit to the micro-control unit；
The micro-control unit adjusts the radio frequency mobile radio receiver according to the reflected signal strength of the reflected signal
The output impedance of transmitter unit and input impedance include：The micro-control unit is anti-according to the signal of the reflected signal S22
Penetrate intensity and the first preset value, by the way of fine setting impedance values step by step or table look-up and determine output impedance adjusted value
Mode, adjusts the output impedance of the radio frequency mobile radio receiver transmitter unit, until the letter of the reflected signal S22
Number reflected intensity is not more than first preset value.
9. impedance matching methods as claimed in claim 7, it is characterised in that
The digital signal processing unit gather the radio frequency mobile radio receiver transmitter unit and the signal source and
Reflected signal between load, and reflected signal is transmitted to the micro-control unit include：The digital signal processing unit
The reflected signal S11 between the radio frequency mobile radio receiver transmitter unit and the signal source is gathered, and will be described
Reflected signal S11 is transmitted to the micro-control unit；
The micro-control unit adjusts the radio frequency mobile radio receiver according to the reflected signal strength of the reflected signal
The output impedance of transmitter unit and input impedance include：The micro-control unit is used for the letter according to the reflected signal S11
Number reflected intensity and the second preset value, by the way of fine setting input impedance value step by step or determination input impedance adjustment of tabling look-up
The mode of value, adjusts the input impedance of the radio frequency mobile radio receiver transmitter unit, until the reflected signal S11
Signal reflex intensity be not more than second preset value.
10. impedance matching methods as described in any one of claim 6 to 9, it is characterised in that the radio frequency mobile radio connects
Receipts machine transmitter unit includes low-noise amplifier and resonator, and the resonator includes input resistant matching network and output resistance
Anti- matching network；The low-noise amplifier by signal source described in the input resistant matching network connection, by described defeated
Go out impedance matching network and connect the load；
The micro-control unit adjusts the output impedance of the radio frequency mobile radio receiver transmitter unit, until described penetrate
The output impedance of frequency mobile radio receiver transmitter unit includes with the impedance matching of the load：The micro-control unit
Adjust the output impedance matching networks so that the impedance matching of the low-noise amplifier and the load；
The micro-control unit adjusts the input impedance of the radio frequency mobile radio receiver transmitter unit, until described penetrate
The input impedance of frequency mobile radio receiver transmitter unit includes with the impedance matching of the signal source：The microcontroller list
Unit's adjustment input resistant matching network so that the impedance matching of the low-noise amplifier and the signal source.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710005174.0A CN106899321B (en) | 2017-01-04 | 2017-01-04 | Digital talkback terminal and impedance matching method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710005174.0A CN106899321B (en) | 2017-01-04 | 2017-01-04 | Digital talkback terminal and impedance matching method thereof |
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| CN106899321A true CN106899321A (en) | 2017-06-27 |
| CN106899321B CN106899321B (en) | 2019-12-06 |
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Cited By (1)
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| CN110286253A (en) * | 2019-05-17 | 2019-09-27 | 中国科学技术大学 | A kind of adaptive probe impedance matching process and device |
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| CN106899321B (en) | 2019-12-06 |
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