CN109088645A - Rfid transmissions Poewr control method and device - Google Patents
Rfid transmissions Poewr control method and device Download PDFInfo
- Publication number
- CN109088645A CN109088645A CN201810996099.3A CN201810996099A CN109088645A CN 109088645 A CN109088645 A CN 109088645A CN 201810996099 A CN201810996099 A CN 201810996099A CN 109088645 A CN109088645 A CN 109088645A
- Authority
- CN
- China
- Prior art keywords
- radio
- power amplifier
- frequency power
- temperature
- operator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- H04B1/02—Transmitters
- H04B1/04—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
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
- Amplifiers (AREA)
Abstract
The present invention provides a kind of rfid transmissions Poewr control method and device, and radiofrequency signal is launched after being amplified by radio-frequency power amplifier, and wherein the method specifically comprises the following steps: adjustment of the judgement triggering to the radio-frequency power amplifier；Obtain the first temperature of the radio-frequency power amplifier, determine the temperature range where first temperature, inquire corresponding first operator of the temperature range, independent variable in first operator is the temperature of radio-frequency power amplifier, dependent variable in first operator is the static gate voltage of radio-frequency power amplifier, adjusts the static gate voltage of the radio-frequency power amplifier by first operator according to first temperature.The fast accurate adjustment of rfid transmissions power may be implemented in the present invention, there is preferable consistency and stability.
Description
Technical field
The present invention relates to technical field of RFID more particularly to a kind of rfid transmissions Poewr control methods and dress
It sets.
Background technique
Mainly there are two key indexes for the factor of decision super high frequency radio frequency recognition read-write machine operating distance, are to receive spirit respectively
Sensitivity and transmission power.According to the propagation characteristic of electromagnetic wave free space, operating distance is every to increase by 1 times, theoretically field strength energy
Decline 6dB.The size of radio-frequency identification reader/writer transmission power determines that it can trigger radio frequency recognizing electronic label backscattering
The operating distance of signal, when radio-frequency identification reader/writer operating distance is larger, influence of the transmission power to its operating distance is just special
Unobvious, often the transmission power error of 1dB can make operating distance phase difference rice.In addition, the identification of China's super high frequency radio frequency
Division frequency range is 920-925MHz, and the frequency spectrum resource around this frequency range is very crowded, and relevant departments are to radio-frequency identification reader/writer
Transmission power stringent regulation has also been made.
In order to make radio-frequency identification reader/writer have the consistency of batch to reach optimal performance, while for radio frequency identification
The transmission power of reader can level off to the requirement of relevant regulations, to the accurate control of rfid transmissions power to closing weight
It wants.However, realizing that the control of rfid transmissions power relies primarily on the amplification of the devices such as radio-frequency power amplifier, passes through at present
The radiofrequency signal generated to modulation unit amplifies, and after obtaining enough radio-frequency powers, can just be fed on antenna module
It radiate.But the working condition of radio-frequency power amplifier usually will receive the influence of external environment, rely on attenuator merely
Radio frequency input is adjusted, degree of regulation is inadequate and error is big.Therefore, the stability of radio frequency identification power control can not reach at present
The requirement of implementation can not especially for the biggish temperature variations of radio-frequency identification reader/writer adaptation the North and South difference are guaranteed
Meet the compatibility compared with wide operating temperature range.
Summary of the invention
The purpose of the present invention is to provide a kind of rfid transmissions Poewr control method and devices, solve the prior art
Middle rfid transmissions power stability is not high, is especially vulnerable to ambient temperature effect lead to control technical problem not in place.
In order to solve the above-mentioned technical problem, a kind of rfid transmissions Poewr control method of the invention, radiofrequency signal are logical
Launch after crossing radio-frequency power amplifier amplification, the control method specifically comprises the following steps:
Adjustment of the judgement triggering to the radio-frequency power amplifier；
The first temperature for obtaining the radio-frequency power amplifier, determines the temperature range where first temperature, described in inquiry
Corresponding first operator of temperature range, the independent variable in first operator are the temperature of radio-frequency power amplifier, described first
Dependent variable in operator is the static gate voltage of radio-frequency power amplifier, passes through first operator according to first temperature
Adjust the static gate voltage of the radio-frequency power amplifier.
As the further improvement of the above-mentioned rfid transmissions Poewr control method of the present invention, radio-frequency power amplifier is closed
Radiofrequency signal input, obtain the quiescent drain current of the radio-frequency power amplifier；
It is whether consistent with standard drain current to compare the quiescent drain current, is leaked in the quiescent drain current and the standard
When the difference of electrode current is more than first threshold, the adjustment of the radio-frequency power amplifier is triggered.
As the further improvement of the above-mentioned rfid transmissions Poewr control method of the present invention, in the quiescent drain current
When consistent with standard drain current, the radiofrequency signal input of radio-frequency power amplifier is opened, judgement is examined by power detecting unit
Whether the transmission power measured is shown with configuration transmission power one determines that the fine tuning to adjustable attenuator operates.
As the further improvement of the above-mentioned rfid transmissions Poewr control method of the present invention, supervised by power detecting unit
Transmission power is surveyed, when the difference of the transmission power and configuration transmission power is more than second threshold, is triggered to the radio frequency function
The adjustment of rate amplifier；Or setting period first time, it is triggered according to the first time loop cycle to the radio frequency function
The adjustment of rate amplifier.
As the further improvement of the above-mentioned rfid transmissions Poewr control method of the present invention, the temperature range is corresponding
First operator is several sampled points pair according to the radio-frequency power amplifier of same batch or same model in same temperature section
Detection data is answered to be fitted, the first operator of foundation is stored in advance to call.
In order to solve the above-mentioned technical problem, a kind of rfid transmissions power control device of the invention, radiofrequency signal are logical
Launch after crossing radio-frequency power amplifier amplification, the control device includes:
Trigger unit triggers the adjustment to the radio-frequency power amplifier for judging；
Adjustment unit determines the temperature where first temperature for obtaining the first temperature of the radio-frequency power amplifier
Corresponding first operator of the temperature range is inquired in section, and the independent variable in first operator is radio-frequency power amplifier
Temperature, the dependent variable in first operator is the static gate voltage of radio-frequency power amplifier, logical according to first temperature
Cross the static gate voltage that first operator adjusts the radio-frequency power amplifier.
As the further improvement of the above-mentioned rfid transmissions power control device of the present invention, the trigger unit closing is penetrated
The radiofrequency signal of frequency power amplifier inputs, and obtains the quiescent drain current of the radio-frequency power amplifier；
It is whether consistent with standard drain current to compare the quiescent drain current, is leaked in the quiescent drain current and the standard
When the difference of electrode current is more than first threshold, the adjustment of the radio-frequency power amplifier is triggered.
As the further improvement of the above-mentioned rfid transmissions power control device of the present invention, in the quiescent drain current
When consistent with standard drain current, the radiofrequency signal input of radio-frequency power amplifier is opened, judgement is examined by power detecting unit
Whether the transmission power measured is shown with configuration transmission power one determines that the fine tuning to adjustable attenuator operates.
As the further improvement of the above-mentioned rfid transmissions power control device of the present invention, the trigger unit passes through function
Rate detection unit monitors transmission power, when the difference of the transmission power and configuration transmission power is more than second threshold, triggering
Adjustment to the radio-frequency power amplifier；Or setting period first time, it is triggered according to the first time loop cycle
Adjustment to the radio-frequency power amplifier.
As the further improvement of the above-mentioned rfid transmissions power control device of the present invention, in the adjustment unit,
Corresponding first operator of the temperature range is according to the radio-frequency power amplifier of same batch or same model in same temperature
Several sampled points in section correspond to detection data and are fitted, and the first operator of foundation is stored in advance to call.
Compared with prior art, the present invention is based on the temperature of radio-frequency power amplifier and quiescent drain current to pass through specifically
Algorithm quickly to adjust the static gate voltage of radio-frequency power amplifier, puts radio-frequency power using the adjustment circuit of closed loop feedback
Big device is in normal working condition, meets actual amplification requirement, and adjustable attenuator is combined to realize fine tuning.The present invention can be with
The fast accurate adjustment for realizing rfid transmissions power, there is preferable consistency and stability.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more
Add clear.
Detailed description of the invention
In order to illustrate more clearly of embodiment of the present invention or the technical solution of the prior art, below will to embodiment or
Attached drawing needed to be used in the description of the prior art is briefly described, it is therefore apparent that the accompanying drawings in the following description is only this
The some embodiments recorded in invention, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is rfid transmissions power control circuit schematic diagram in an embodiment of the present invention.
Fig. 2 is rfid transmissions Poewr control method schematic diagram in an embodiment of the present invention.
Fig. 3 is power amplifier drain current and grid voltage relational graph in an embodiment of the present invention.
Fig. 4 is the relational graph of static gate voltage and temperature when power amplifier normally amplifies in an embodiment of the present invention.
Fig. 5 is rfid transmissions Poewr control method flow chart in an embodiment of the present invention.
Rfid transmissions power control device schematic diagram in an embodiment of the present invention of the position Fig. 6.
Specific embodiment
Hereinafter, the present invention will be described in detail with reference to various embodiments shown in the accompanying drawings.But these embodiments are not
The limitation present invention, structure that those skilled in the art are made according to these embodiments, method or change functionally
It changes and is included within the scope of protection of the present invention.
It should be noted that in various embodiments, identical label or label may be used, but these not generations
Table structure or absolute connection relationship functionally.Also, also not generation such as " first " that is previously mentioned in each embodiment, " second "
Table structure or absolute differentiation relationship functionally, these are merely for convenience of description.
As shown in Figure 1, rfid transmissions power control circuit schematic diagram in an embodiment of the present invention.Radio frequency identification hair
Penetrating power control circuit includes forward link, coupler 14 and antenna module 15.Forward link by the processing of internal circuit to
Corresponding radiofrequency signal is radiate by the radiofrequency signal of the feeding transmitting of antenna module 15, antenna module 15.Antenna module 15 has
It include body corresponding antenna and aerial network, antenna is transformed into the guided wave propagated on transmission line as a kind of converter
The electromagnetic wave propagated in air propagates requirement, the general increasing with 12dBi or 10dBi to meet certain space length
Benefit requires, and corresponding standing wave also has certain requirement, to guarantee circuit that the portion of energy of antenna-reflected is not inside breakdown.
In a preferred embodiment, the radio-frequency identification reader/writer being mounted in traffic can connect mutiple antennas, and each antenna is responsible for
The identification of lane vehicle all the way, since there may be interference, corresponding aerial networks for receiving and transmitting signal between antenna and antenna
Has the function of high speed poll, it is ensured that only one the connection work within the same time of the mutiple antennas of connection.
In forward link, modulation unit 11 generates corresponding radiofrequency signal, radio frequency according to the frequency that local oscillation signal provides
Signal can be and provide the carrier signal of energy exclusively for radio frequency recognizing electronic label, or modulates baseband signals to carrier wave are believed
Modulated signal on number.Modulation unit 11 is connect with control unit 21, and whether control unit 21 can control modulation unit 11 defeated
Radiofrequency signal and export which type of radiofrequency signal out.Modulation unit 11 preferably includes quadrature modulator, quadrature modulator
It including the road I control terminal and the road Q control terminal, is connect respectively with control unit 21, the road I control signal and Q is exported by control unit 21
Road controls signal.It should be noted that control unit 21 can be realize instruction control processor, microcontroller, also or
It is FPGA (Field-Programmable Gate Array, field programmable gate array), it is the control of entire forward link
Center processed receives corresponding testing result, exports corresponding control signal.
Adjustable attenuator 12 is connect with the output end of modulation unit 11, receives the radiofrequency signal of the output of modulation unit 11,
Radiofrequency signal may further be adjusted with meet rear class amplification after transmission power requirement, adjustable attenuator 12 also with control
Unit 21 processed connects, and control unit 21 can control the pad value of adjustable attenuator 12 to realize and zoom in or out penetrating of receiving
Frequency signal.The input terminal of the radio-frequency power amplifier 13 of next stage is connect with the output end of adjustable attenuator 12, is received adjustable
The radiofrequency signal adjusted of attenuator 12, the main function of radio-frequency power amplifier 13 are exactly to be amplified to radiofrequency signal with full
The requirement of sufficient signal transmitting, is fed to antenna module for amplified radiofrequency signal by the output end of radio-frequency power amplifier 13
15, particular by 14 indirect communication of coupler to antenna module 15.In more embodiments, adjustable attenuator 12 with
Driving amplifier is additionally provided between radio-frequency power amplifier 13 for realizing further amplification.
Radio-frequency power amplifier 13 exports amplified radiofrequency signal to coupler 14, and coupler includes input terminal and defeated
The input terminal of outlet, coupler 14 is connect with the output end of radio-frequency power amplifier 13, the output end and antenna sets of coupler 14
Part 15 connects, it is preferable that the isolation characteristic of coupler guarantees that the signal in coupler 14 has the characteristic of directional transmissions, in this way may be used
To guarantee that the radiofrequency signal of forward link transmitting will not enter the identification that influence in receives link receives signal, radio frequency letter is realized
Number transmitting-receiving isolation, so that radio-frequency identification reader/writer can share an antenna module in transceiving radio frequency signal.Specifically coupling
Clutch be directional coupler or strip line coupler, corresponding coupler usually have there are four port, respectively first end, second
End, third end, the 4th end, during use, four ports have the property that, can when first end input radio frequency signal
Can also couple and export from third end from the straight-through output of second end, and the 4th end is isolated.When second end input radio frequency signal,
It can also couple and export from the 4th end from the straight-through output of first end, and third end is isolated.Third end input radio frequency signal
When, it can also couple and export from first end from the straight-through output in the 4th end, and second end is isolated.4th end input radio frequency letter
Number when, can also couple and export from second end from the straight-through output in third end, and first end is isolated.Therefore, it can will couple
The first end of device is as input terminal, and using second end as output end, and so on, can also using other termination as input terminal,
Corresponding one end can be used as output end.It should be noted that strip line coupler is relative to directional coupler, using two
Item is placed in parallel, the first microstrip line and the second microstrip line close to each other, the both ends of the first microstrip line can be used as first end and
Second end, and the both ends of the second microstrip line can be used as third end and the 4th end, due to the first end and second of the first microstrip line
The third end of microstrip line is close to each other, and the coupled characteristic of signal may be implemented, similarly the second end of the first microstrip line and second micro-
The 4th end with line is close to each other to have certain coupled characteristic, and the coupler realized by microstrip line is at low cost, and occupies circuit
Space is small.In more embodiments, corresponding coupling function can also be realized by coupled apparatuses such as circulators, and realize
The directional transmissions of signal.
After radiofrequency signal is exported from modulation unit 11 sequentially through adjustable attenuator 12, radio-frequency power amplifier 13
It can be radiate by coupler 14 and antenna module 15, therefore, the quality of radiofrequency signal depends on the performance of above-mentioned device, especially
It is the influence that radio-frequency power amplifier 13 is highly prone to environment temperature.Therefore, pass through the work of monitoring radio-frequency power amplifier 13
Guarantee that radio-frequency power amplifier 13 remains at normal magnifying state as temperature.Specifically it is provided in forward link
Temperature sensor 22, temperature sensor 22 can be the temperature sensor of model LM75C.In order to guarantee to detect radio-frequency power
The accuracy of 13 temperature of amplifier, temperature sensor 22 can be set in circuit close to the side of radio-frequency power amplifier 13 position
It sets.Temperature sensor 22 connects control unit 21 and is transferred to control unit 21 with the temperature information that will test, and control unit 21 is also
It is connected with digital analog converter 23, the digital controlled signal that control unit 21 exports can be converted into corresponding by digital analog converter 23
Analog signal generates corresponding compensation grid voltage.Digital analog converter 23 is specifically as follows AD5541, digital analog converter 23
Output end is connected to the input terminal of radio-frequency power amplifier 13, in parallel with the adjustable attenuator 12 of connection.It is put based on radio-frequency power
The characteristic of big device, the working condition of radio-frequency power amplifier can change with the variation of temperature, for example amplification is caused to be lost
Very, but the working condition of radio-frequency power amplifier is related with corresponding static gate voltage, since grid voltage is to be added in penetrate
On the input terminal of frequency power amplifier, therefore the corresponding grid of radio-frequency power amplifier can be adjusted by digital analog converter 23
Voltage realizes the adjustment of working condition.Although the working condition of radio-frequency power amplifier can change with different temperatures,
It is that can guarantee the stability of radio-frequency power amplifier working condition at the same temperature, therefore guarantee radio frequency function under same temperature
The static gate voltage that rate amplifier is under normal operating conditions be also it is constant, control unit 21 only need to be according to different temperature
Degree adjusts the grid voltage of corresponding radio-frequency power amplifier, so that it may which the stability for guaranteeing entire emission of radio frequency signals power is
The accurate control of radio-frequency power amplifier provides hardware foundation.
It is based further on the characteristic of radio-frequency power amplifier, the quiescent drain electricity that radio-frequency power amplifier output end detects
Stream can determine the working condition of radio-frequency power amplifier, corresponding when radio-frequency power amplifier is under normal magnifying state
Quiescent drain current be also constant.It is therefore preferred that current detecting unit 24 is additionally provided in forward link, electric current inspection
The output end that unit 24 is connected in parallel on radio-frequency power amplifier is surveyed, can detecte the quiescent drain current of radio-frequency power amplifier, even
The quiescent drain current information that connecing control unit 21 will test is transferred to control unit 21.In a particular embodiment, electric
Flowing detection unit 24 includes sequentially connected precision resistance and power supply, by the output for being connected in radio-frequency power amplifier in parallel
End has been arranged in parallel corresponding current sensing device at the both ends of precision resistance, and the output end of current sensing device connects control
Unit 21.Specific current sensing device can be INA220, and precision resistance is 0.02 ohm, and power supply is 26-28 volts.Electric current inspection
The drain current passed through can be detected by precision resistance by surveying device, it should be noted that in order to guarantee radiofrequency signal by penetrating
Frequency power amplifier influences detection bring, and when detecting quiescent drain current, control unit 21 controls modulation unit 11 and closes
Close the output of radiofrequency signal.Since the quiescent drain current of radio-frequency power amplifier can determine the work of radio-frequency power amplifier
State, therefore whether control unit 21 determines radio-frequency power amplifier by the quiescent drain current that current detecting unit detects
In normal working condition, to be assured that whether corresponding grid voltage has been adjusted to position.
In more embodiments, since adjustment radio-frequency power amplifier can only guarantee that radio-frequency power amplifier is in just
Normal working condition is in the power amplification of radiofrequency signal in reasonable range, but if necessary to export accurate transmitting
Still there is certain error in power.Therefore, by the coupling of coupler 14 all the way radio signal transmission to power detecting unit 25,
The radiofrequency signal all the way of coupling is passed through after the amplified radiofrequency signal of radio-frequency power amplifier 13 is input to coupler 14
The radiofrequency signal all the way of the coupled end output of coupler 14.Specifically, the input terminal of coupler 14 connects radio-frequency power amplifier
13 output end, the output end of coupler 14 connect antenna module 15, and the coupled end of coupler 14 connects power detecting unit 25,
Power detecting unit is specifically as follows the logarithmic detector of AD8364, it is preferable that is integrated with corresponding modulus in control unit and turns
Parallel operation carries out digital conversion to corresponding analog signal, and in more embodiments, analog-digital converter also be can integrate in function
In rate detection unit.Power detecting unit 25 connects control unit 21, and it is single that the transmission power information that will test is transferred to control
Member 21, control unit 21 may include corresponding comparator, by comparing corresponding transmission power and target power, if met
Consistency determines that transmission power adjustment is completed, if it exceeds certain error range, illustrates that transmission power does not meet consistency,
Control unit 21 can send adjustment signal to adjustable attenuator 12 at this time, by adjustable attenuator 12 to being input to radio-frequency power
The radiofrequency signal of amplifier 13 is adjusted, to guarantee that the corresponding radiofrequency signal for being transferred to antenna module 15 meets transmission power
It is required that.In a preferred embodiment, it can be also provided with amplifier between the coupled end of coupler 14 and power detecting unit 25,
Decaying of the radiofrequency signal of the output of radio-frequency power amplifier 13 after coupler 14 is compensated, by amplifier to guarantee to emit function
The accuracy of rate detection.
In the rfid transmissions power control circuit for including adjustable attenuator and radio-frequency power amplifier, radiofrequency signal
Launch after being amplified by radio-frequency power amplifier, connect especially by coupler with antenna module, adjustable attenuator can be with
The radiofrequency signal input of radio-frequency power amplifier is adjusted, to influence the size of transmission power indirectly.In this embodiment party
In formula, can temperature and quiescent drain current based on the radio-frequency power amplifier detected, carried out by specific algorithm fast
Velocity modulation is whole.As shown in Fig. 2, rfid transmissions Poewr control method schematic diagram in an embodiment of the present invention.Radio frequency identification hair
Poewr control method is penetrated, is specifically comprised the following steps:
Step S1 judges to trigger the adjustment to radio-frequency power amplifier.As described above, transmission power deteriorates in forward link
Producing cause often main cause is to be that radio-frequency power amplifier causes magnification distortion with the variation of temperature, therefore
Allowing radio-frequency power amplifier to be in normal working condition is the control most important step of transmission power.It can be obtained from the above content
Out, the key node of transmission power control is broadly divided into following several situations, and one is corresponding radio-frequency identification reader/writers just to have opened
When dynamic, the control of transmission power relies primarily on the configuration of default at this time, can not variation according to the actual situation and carry out self-regulated
Whole, there are also one is when the variation that matter has occurred in the extraneous factors such as environment temperature, the device emitted in link can not be with change
Change and adjusts.And in the present embodiment, it just can be based on judging that above situation is triggered corresponding adjustment.
When the first equipment just starts, triggering set-up procedure can be directly realized by initialization program.For second situation, then
It needs to carry out auxiliary triggering by means of corresponding monitoring data.In a particular embodiment, it is monitored and is sent out by power detecting unit
Penetrate power, it should be noted that radio-frequency power amplifier at this time has normal radiofrequency signal to input, i.e., entire radio frequency is known
Other reader is in normal work, as set forth above, it is possible to emit signal all the way by coupling constantly to detect corresponding transmitting
Whether power meets corresponding requirement, mutates if there is transmission power, illustrates that controlling environment is changed, and at this time may be used
To be adjusted correspondingly, such as when the difference of the transmission power and configuration transmission power is more than second threshold, triggering pair
The adjustment of radio-frequency power amplifier, configuration transmission power can be the setting instruction that bottom is handed down in upper layer application, for real
The transmission power that border needs, second threshold is the value being previously set, the Rule of judgment for occurring deteriorating for determining transmission power.?
In more embodiments, period first time can also be set, by periodically general adjustment, progress is directly periodically repaired
Just, sporadic ground transmission power deterioration problem can substantially be solved in time in this way.
Preferably, quiescent drain current detection is carried out using output end of the current detecting unit to radio-frequency power amplifier,
As described above, quiescent drain current can reflect the working condition of radio-frequency power amplifier to a certain extent.Radio frequency in order to prevent
Power amplifier radio frequency inputs the influence detected to quiescent drain current, in the quiescent drain current of detection radio-frequency power amplifier
When can close radio-frequency power amplifier radiofrequency signal input, can specifically turn off respective radio-frequency signals input channel, this
In embodiment, control unit can control modulation unit and not generate corresponding radiofrequency signal.At this point, radio-frequency power amplifier is
There is corresponding quiescent drain current under the action of static gate voltage.Comparative static drain current is with standard drain current
No consistent, standard drain current is radio-frequency power amplifier corresponding quiescent drain current under normal magnifying state, specifically may be used
To obtain radio-frequency power amplification by the sampling Detection of the radio-frequency power amplifier to same batch or same model, analysis statistics
Quiescent drain current of the device in efficiency highest, is previously stored, and acquisition of tabling look-up when comparing, further standard drain current can root
Different numerical value is previously stored according to different temperature ranges, these numerical value are all by true to detection statistics under different temperatures section
Quiescent drain current when fixed radio-frequency power amplifier works normally, can be obtained when comparing calling by temperature sensor
Temperature range where corresponding radio-frequency power amplifier simultaneously inquires corresponding standard drain current, penetrates for judging more accurately
The working condition of frequency power amplifier.It is more than first threshold in the difference of the quiescent drain current and standard drain current that detect
When, trigger the adjustment of radio-frequency power amplifier.First threshold is also to be previously set, for indicating quiescent drain current and standard
Drain current unanimously with it is inconsistent between boundary, if it exceeds first threshold is it is assumed that be inconsistent, and be less than the first threshold
Value it is assumed that be it is consistent, if first threshold is set as zero, as long as just illustrating quiescent drain current and standard drain current
Have it is the same can all regard as inconsistent, but in order to retain certain error range, first threshold can be set as
The numerical value of non-zero.Further, when quiescent drain current is consistent with standard drain current, it can guarantee that radio-frequency power amplifies at this time
The input of device radiofrequency signal is opened, that is, monitors the size of normal transmission power, is deposited if there is transmission power and configuration transmission power
In certain error, the fine tuning that can also be realized by control adjustable attenuator makes actual transmission power level off to configuration
Transmission power.
You need to add is that when opening the radiofrequency signal Input Monitor Connector transmission power of radio-frequency power amplifier or setting the
A period of time periodically triggers in the embodiment of adjustment, can also before adjustment further in order to reduce extra adjustment process
The radiofrequency signal input for closing corresponding radio-frequency power amplifier detects the quiescent drain current of corresponding radio-frequency power amplifier, passes through
Detection determines whether corresponding radio-frequency power amplifier is in normal magnifying state, if can just trigger pair in abnormality
The adjustment of radio-frequency power amplifier will skip set-up procedure if being in normal condition.For monitoring the implementation of transmission power
In mode, there is exception in transmission power but radio-frequency power amplifier is in normal condition, it is possible to which internal circuit device occurs different
Often, situations such as example the isolation performance exception or antenna of coupler open circuit occur causes to be reflected into internal signal strength increasing
Greatly, it can trigger at this time and close modulation unit transmitting signal output, send out prompt information out of order when necessary, prompt relevant people
Member is safeguarded in time.
Step S2 obtains the first temperature of the radio-frequency power amplifier, determines corresponding first operator of the first temperature, root
The static gate voltage of the radio-frequency power amplifier is adjusted by first operator according to first temperature.Step S2 is
The specific adjustment process started after step S1 triggering can detect radio-frequency power by temperature sensor as described above first and put
The temperature of big device, specific the first temperature for obtaining radio-frequency power amplifier, the temperature range where being determined by the first temperature, temperature
Degree section is the radio-frequency power amplifier performance according to corresponding batch or model and the multiple temperature ranges set, each humidity province
Between be set with the corresponding operator for calculating radio-frequency power amplifier static gate voltage, inquiry corresponding temperature section associated first is calculated
Son, according to the corresponding static gate voltage of corresponding first temperature computation of the first operator input.Wherein, operator is intended to indicate that certainly
The algorithmic formula of mapping relations between variable and dependent variable, in the present embodiment, the independent variable in operator is put for radio-frequency power
The temperature of big device, the dependent variable in operator are the static gate voltage of radio-frequency power amplifier.
As shown in figure 3, different grid voltage Vgs can for the radio-frequency power amplifier of same batch or model
To cause different drain current Ids, and the static gate voltage for radio-frequency power amplifier under normal magnifying state
For Vgsq, quiescent drain current Idsq, the corresponding quiescent gate of same radio-frequency power amplifier under different temperatures T1, T2, T3
Voltage all can be different.Therefore it in order to guarantee that radio-frequency power amplifier is under normal working condition, needs at different temperature
Different grid voltages to be provided on corresponding radio-frequency power amplifier.As shown in figure 4, different temperature nodes T10,
The corresponding static gate voltage of T20, T30, T40, T50, T60, T70 is all not quite similar, in the embodiment that constant grid potential is tabled look-up
In, several temperature ranges can be cut into temperature reference axis, each temperature range sets an average grid voltage for inquiry
It calls, such as setting T10-T20 temperature range, T20-T30 temperature range, and so on, the corresponding quiescent gate electricity of T10-T20
Pressure is A, and the corresponding static gate voltage of T20-T30 is B, if it is determined that corresponding first temperature is in T10-T20 temperature range, just
Corresponding radio-frequency power amplifier is adjusted according to static gate voltage A.The defect of this way is that, quiet as shown in Figure 4
From the point of view of the growth trend of state grid voltage, mean gate voltage can not accurately represent corresponding radio-frequency power amplifier sometimes and exist
Static gate voltage under specific temperature at this time if table look-at, which calls, can bring about the error of adjustment, while also needing pair
The setting quantity of temperature range is very close, increases complexity set in advance.Therefore in the present embodiment, although equally in temperature
It sets several temperature ranges in reference axis, but is to be called by the way of operator for different temperatures section, and it is right
The static gate voltage answered is to calculate acquisition by different radio-frequency power amplifier temperature.
Specifically, the different temperatures section of division includes the first temperature range, second temperature section, and the first temperature range
Corresponding includes the first operator, and corresponding second temperature section includes the second operator, and different temperature ranges is according to actual samples data
With different operator formula, the determination of specific operator is according to the radio-frequency power amplifier of same batch or same model same
Several sampled points of one temperature range correspond to detection data and are fitted, and specific sampled data is in corresponding temperature sampling process
Static gate voltage when the efficiency of RF power amplifier highest of record.In the present embodiment, actually to different
Temperature range defines different linear splines, it is assumed that T10-T20 is an individual temperature range, T20-T30
For an individual temperature range, and so on, the curve between each temperature range assume that as a linear spline
Mathematical model, corresponding mathematical modeling formula can be defined as Vgs=kT+b, and wherein Vgs is the static state of radio-frequency power amplifier
Grid voltage, T is the temperature of radio-frequency power amplifier, and k, b are corresponding first coefficient, the second coefficient, based on sampling difference
At a temperature of detection data can realize corresponding fitting, most simple direct mode can sample in corresponding temperature section
Two groups of data substitute into respectively weaves into equation group, and two groups of data can preferably be the sampling of two end point temperatures in corresponding temperature section
Static gate voltage calculates corresponding first coefficient and the second coefficient.
In more embodiments, in order to guarantee the accuracy of fitting, least square method can also be used, in fitting
In the process, it actually requiresMinimization, wherein S is the practical static grid of all sampled points
The quadratic sum of pole tension static gate voltage error corresponding with mathematical model calculating, m are the sampling number in corresponding temperature section
Amount, Vi is the practical static gate voltage of corresponding sampled point, and Ti is the radio-frequency power amplifier temperature of corresponding sampled point, and f
(Ti) corresponding is static gate voltage that mathematical model acquires corresponding sampled point, in order to reach an optimal necessary item of fitting
Part is that following two partial derivative is zero,
(1)
(2)
By formula (1) and formula (2) Simultaneous Equations being solved it can be concluded that corresponding first coefficient k and the second coefficient b, from
And it obtains corresponding operator and is stored for being called during actual adjustment.
Further for the accuracy for improving fitting and the complexity solved is reduced, first to phase before using least square method
The variable answered carries out data transformation, keeps transformed data fitting a straight line more convenient, for example the actual curve in Fig. 4 is one
Vgs in above-mentioned mathematical model can be transformed to by concave up increasing function curve for tail down on the right side of extrusion graph
Log (Vgs) or, a New Mathematical Model than original mathematical model closer to straight line is generated, is then similarly adopted
Corresponding first coefficient k and the second coefficient b are obtained with above-mentioned least square method.In addition, in addition to least square method can be used
Fitting can also be realized using chebyshev approximation criterion.
Above-mentioned mathematical model uses different linear mathematical models to different temperatures section using linear spline, can be substantially anti-
Reflect the static gate voltage under different temperatures, but the linear spline of different temperatures section composition be it is rough, cause adjacent
The linear gradient of the temperature nodes of temperature range mutates, and the corresponding operator of adjacent temperature range is used to calculate adjacent node
At a temperature of static gate voltage can also there is a situation where different, therefore, in a preferred embodiment, may be incorporated into three ranks
Spline Model specifically assume that the mathematical model of every section of temperature range is,
Wherein Vgs is the static gate voltage of radio-frequency power amplifier, and T is the temperature of radio-frequency power amplifier, a1, a2, a3, a4 difference
For the first coefficient, the second coefficient, third coefficient, the 4th coefficient, referring to the methods of above-mentioned least square method be based on same batch or
Several sampled points of the radio-frequency power amplifier of same model in same temperature section correspond to detection data and are fitted.Further
By carrying out single order and second order derivation to the corresponding mathematical model of adjacent temperature range, guarantee smooth at adjacent temperature nodes
Property, increase corresponding equation and is limited.Specifically, the corresponding mathematical model of three rank battens of two neighboring temperature range is assumed to divide
It is not:
,；
Above-mentioned progress first derivative and second dervative respectively are respectively as follows:
,；
,；
It is therefore assumed that T0 is the temperature nodes of adjacent temperature range, may include equation defined below:
Can also include equation defined below to guarantee that T0 temperature nodes are continuous between adjacent temperature range:
By can be in the hope of b1, b2, b3, b4 and c1, the corresponding numerical value of c2, c3, c4, to make by above-mentioned formula Simultaneous Equations
Operator for corresponding different temperatures section is saved.In more embodiments, the mathematics of each temperature range building
Model can select suitable mathematical model according to the tendency of actual samples data.
As shown in figure 5, the control process of entire transmission power can be broadly divided into two steps, one is to radio-frequency power
The adjustment of amplifier, followed by the adjustment to adjustable attenuator.Firstly, in the step of triggering is adjusted, first to radio frequency function
Rate amplifier is adjusted, the embodiment that can be specifically tabled look-up by constant grid potential, finds radio-frequency power amplifier detection
The corresponding default grid voltage of temperature range where temperature detects respective radio-frequency function after may further turning off radiofrequency signal input
The quiescent drain current of rate amplifier, if corresponding quiescent drain current is not met when radio-frequency power amplifier works normally
When standard drain current, it is further carried out fine tuning, the mode of fine tuning can be carried out using the operator in inquiry corresponding temperature section
It calculates, in a preferred embodiment, skips the step of constant grid potential is tabled look-up, directly calculated by corresponding operator.Such as Fig. 5
Shown, shutdown radiofrequency signal input can be corresponded to the quiescent drain current of radio-frequency power amplifier with accurate detection in this way, be passed through
Current detecting unit obtains quiescent drain current of the radio-frequency power amplifier when no radiofrequency signal inputs, and judges corresponding static state
Whether drain current meets corresponding standard drain current, and standard drain current is output when radio-frequency power amplifier normally amplifies
Quiescent drain current, and carry out by radio-frequency power amplifier to same batch or same model the data of sample detecting
Determining, specifically also different standard drain currents can be accurately set in section depending on the temperature, in the process of judgement
In also can first detect the temperature of corresponding radio-frequency power amplifier, select corresponding standard to leak further according to the temperature range where temperature
Electrode current.If the quiescent drain current of detection is identical as corresponding standard drain current or error is little, illustrate corresponding penetrate
Frequency power amplifier is in normal magnifying state, at this time there is no need to be adjusted to radio-frequency power amplifier, directly to can
Controlled attenuator is adjusted, if it is determined that when determining that corresponding radio-frequency power amplifier is in the state of magnification distortion, at this time
The static gate voltage by adjusting radio-frequency power amplifier is needed to adjust the working condition of radio-frequency power amplifier.
Specifically, the temperature T that radio-frequency power amplifier is obtained by temperature sensor, judges the humidity province where temperature T
Between, as described above, temperature range be divided according to the tendency of the static gate voltages of actual samples at different temperatures it is multiple
Temperature range is not limited solely to 3 temperature ranges as shown in the figure, may be due to radio-frequency power amplifier at different temperatures
Static gate voltage tendency complexity, and be divided into more temperature ranges, the specific mode for dividing temperature range can
Determine the need for being divided into individual temperature with the differential variation by the static gate voltage for statisticalling analyze adjacent samples points
Section is spent, for example difference value size has been more than certain threshold value, two different temperature are just set between adjacent sample point
Section.The processing branch that temperature range where finding corresponding temperature T is compared by tandem type, according to the operator in corresponding temperature section
Corresponding static gate voltage is calculated, then control unit can be supplied to radio frequency according to the size of static gate voltage to adjust
The grid voltage of power amplifier.May further recycle obtain variation after quiescent drain current, and with standard drain current
It is compared, the adjustment leapt to if consistent to adjustable attenuator is continued cycling through and detected again if still inconsistent
The temperature of radio-frequency power amplifier re-starts the adjustment of static gate voltage.In order to guarantee still cannot after repeatedly recycling
Endless loop situation caused by the case where reaching adjustment purpose further can also set cycle-index limitation, when following more than setting
When ring number, just directly terminate the adjustment to radio-frequency power amplifier, or reality is come using the size for directly finely tuning grid voltage
It is existing.As described above, second adjustment having main steps that adjustable attenuator, since adjustment is needed based on the inspection to transmission power
It surveys, it is therefore desirable to open radiofrequency signal input, control adjustable attenuator is finely adjusted, and is then judged whether and configuration transmission power
Unanimously, if unanimously, stopping adjustment, if inconsistent, will recycling and adjust adjustable attenuator again, the adjustment of adjustable attenuator
If mode can be the transmission power detected greater than configuration transmission power, it is increased by the pad value of adjustable attenuator, such as
When the transmission power that fruit detects is less than configuration transmission power, the pad value of adjustable attenuator is just reduced.In more embodiment party
In formula, can also number be adjusted to the circulation of adjustable attenuator and make limitation, reduce the generation of endless loop in program.
As shown in fig. 6, rfid transmissions power control device schematic diagram in an embodiment of the present invention.Radio frequency identification hair
Penetrating power control device includes trigger unit U1, adjustment unit U2.In the internal circuit of control device control, radiofrequency signal is logical
Launch after crossing radio-frequency power amplifier amplification, in addition it can by controlling adjustable attenuator come further to transmission power
It is adjusted, control device is specifically to carry out specific algorithm adjustment to radio-frequency power amplifier and adjustable attenuator to realize hair
Penetrate the control of power.
Trigger unit U1 is used to judge to trigger the adjustment to the radio-frequency power amplifier.The effect of trigger unit U1 is
How to start primary adjustment process, it is therefore desirable to confirmation be it is unstable or abnormal when progress occur in transmission power, most directly
Triggering mode when being exactly that corresponding radio-frequency identification reader/writer has just started initialization, start to adjust by trigger unit U1 triggering.
In more embodiments, trigger unit U1 closes the radiofrequency signal input of radio-frequency power amplifier, obtains the radio frequency function
The quiescent drain current of rate amplifier, as described above, when detecting the quiescent drain current of radio-frequency power amplifier, if there is penetrating
The drain current that frequency signal detects in the case where inputting is not just quiescent drain current, therefore just will affect and put to radio-frequency power
The judgement of big device work.Further, whether the quiescent drain current and standard drain current are consistent, in the static leakage
When the difference of electrode current and the standard drain current is more than first threshold, the adjustment of the radio-frequency power amplifier is triggered.?
When the quiescent drain current is consistent with standard drain current, illustrates that radio-frequency power amplifier is in normal magnifying state, beat
Open radio-frequency power amplifier radiofrequency signal input, judge the transmission power detected by power detecting unit whether with configuration
Transmission power one, which is shown, determines that the fine tuning to adjustable attenuator operates.Preferably, trigger unit U1 can also pass through power detection
Unit monitors transmission power, when the difference of the transmission power and configuration transmission power is more than second threshold, triggers to described
The adjustment of radio-frequency power amplifier；Or setting period first time, it is triggered according to the first time loop cycle to described
The adjustment of radio-frequency power amplifier can supervise the radio-frequency identification reader/writer of continuous service in present embodiment, guarantee
Transmission power is in reliable and stable configuration level.
Adjustment unit U2 is used to obtain the first temperature of the radio-frequency power amplifier, where determining first temperature
Temperature range inquires corresponding first operator of the temperature range, and the independent variable in first operator is radio-frequency power amplification
The temperature of device, the dependent variable in first operator are the static gate voltage of radio-frequency power amplifier, according to first temperature
Degree adjusts the static gate voltage of the radio-frequency power amplifier by first operator.In adjustment unit U2, the temperature
If corresponding first operator in section is according to the radio-frequency power amplifier of same batch or same model in same temperature section
Dry sampled point corresponds to detection data and is fitted, and the first operator of foundation is stored in advance to call.Specific fitting is to be based on
In temperature range under different temperatures sampled point determine static gate voltage come it is calculating, it can be achieved that method include minimum two
Multiplication intends criterion etc., is specifically referred to the embodiment of rfid transmissions Poewr control method.As described above, temperature range
May include it is multiple, according to the performance of radio-frequency power amplifier determine, the correspondence operator in different temperatures section is also different, inspection
The radio-frequency power amplifier measured can determine corresponding operator calculating pair according to the actually detected temperature range to where temperature
Answer static gate voltage.It should be noted that the specific embodiment of rfid transmissions power control device is referred to penetrate
Frequency identifies the specific embodiment of transmission power control method.
In conjunction with method and technology scheme disclosed in the present application, hardware can be embodied directly in, by the soft of control unit execution
Part module or both combination, i.e. one or more steps and/or one or more steps combination, both can correspond to computer journey
Each software module of sequence process can also correspond to each hardware module, such as ASIC(Application Specific
Integrated Circuit, specific integrated circuit), FPGA(Field-Programmable Gate Array, scene can compile
Journey gate array) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or it is any suitable
Work as combination.For convenience of description, it is divided into various modules when description above-mentioned apparatus with function to describe respectively, certainly, is implementing this
The function of each module can be realized in the same or multiple software and or hardware when application.
As seen through the above description of the embodiments, those skilled in the art can be understood that the application can
It realizes by means of software and necessary general hardware platform.Based on this understanding, the technical solution essence of the application
On in other words the part that contributes to existing technology can be embodied in the form of software products.The software is by microcontroller list
Member executes, and depends on required configuration, may include any kind of one or more micro-control units, including but not limited to
Micro-control unit, microcontroller, DSP(Digital Signal Processor, Digital Signals unit) or its any group
It closes.The software is stored in memory, for example, volatile memory (such as random-access memory etc.), nonvolatile memory
(for example, read-only memory, flash memory etc.) or any combination thereof.
In conclusion the present invention is based on the temperature of radio-frequency power amplifier and quiescent drain current by specific algorithm come
The quickly static gate voltage of adjustment radio-frequency power amplifier, is made at radio-frequency power amplifier using the adjustment circuit of closed loop feedback
In normal working condition, meet actual amplification requirement, and adjustable attenuator is combined to realize fine tuning.The present invention may be implemented to penetrate
The fast accurate adjustment of frequency identification transmission power, there is preferable consistency and stability.
It should be appreciated that although this specification is described in terms of embodiments, but not each embodiment only includes one
A independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should will say
As a whole, the technical solution in each embodiment may also be suitably combined to form those skilled in the art can for bright book
With the other embodiments of understanding.
The series of detailed descriptions listed above only for feasible embodiment of the invention specifically
Protection scope bright, that they are not intended to limit the invention, it is all without departing from equivalent implementations made by technical spirit of the present invention
Or change should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of rfid transmissions Poewr control method, radiofrequency signal is launched after being amplified by radio-frequency power amplifier,
It is characterized in that, the control method specifically comprises the following steps:
Adjustment of the judgement triggering to the radio-frequency power amplifier；
The first temperature for obtaining the radio-frequency power amplifier, determines the temperature range where first temperature, described in inquiry
Corresponding first operator of temperature range, the independent variable in first operator are the temperature of radio-frequency power amplifier, described first
Dependent variable in operator is the static gate voltage of radio-frequency power amplifier, passes through first operator according to first temperature
Adjust the static gate voltage of the radio-frequency power amplifier.
2. rfid transmissions Poewr control method according to claim 1, which is characterized in that close radio-frequency power amplification
The radiofrequency signal of device inputs, and obtains the quiescent drain current of the radio-frequency power amplifier；
It is whether consistent with standard drain current to compare the quiescent drain current, is leaked in the quiescent drain current and the standard
When the difference of electrode current is more than first threshold, the adjustment of the radio-frequency power amplifier is triggered.
3. rfid transmissions Poewr control method according to claim 2, which is characterized in that in the quiescent drain electricity
When flowing consistent with standard drain current, the radiofrequency signal input of radio-frequency power amplifier is opened, judgement passes through power detecting unit
Whether the transmission power detected is shown with configuration transmission power one determines that the fine tuning to adjustable attenuator operates.
4. rfid transmissions Poewr control method according to claim 1, which is characterized in that pass through power detecting unit
Transmission power is monitored, when the difference of the transmission power and configuration transmission power is more than second threshold, is triggered to the radio frequency
The adjustment of power amplifier；Or setting period first time, it is triggered according to the first time loop cycle to the radio frequency
The adjustment of power amplifier.
5. rfid transmissions Poewr control method according to claim 1, which is characterized in that the temperature range is corresponding
The first operator be several sampled points according to the radio-frequency power amplifier of same batch or same model in same temperature section
Corresponding detection data is fitted, and the first operator of foundation is stored in advance to call.
6. a kind of rfid transmissions power control device, radiofrequency signal is launched after being amplified by radio-frequency power amplifier,
It is characterized in that, the control device includes:
Trigger unit triggers the adjustment to the radio-frequency power amplifier for judging；
Adjustment unit determines the temperature where first temperature for obtaining the first temperature of the radio-frequency power amplifier
Corresponding first operator of the temperature range is inquired in section, and the independent variable in first operator is radio-frequency power amplifier
Temperature, the dependent variable in first operator is the static gate voltage of radio-frequency power amplifier, logical according to first temperature
Cross the static gate voltage that first operator adjusts the radio-frequency power amplifier.
7. rfid transmissions power control device according to claim 6, which is characterized in that the trigger unit is closed
The radiofrequency signal of radio-frequency power amplifier inputs, and obtains the quiescent drain current of the radio-frequency power amplifier；
It is whether consistent with standard drain current to compare the quiescent drain current, is leaked in the quiescent drain current and the standard
When the difference of electrode current is more than first threshold, the adjustment of the radio-frequency power amplifier is triggered.
8. rfid transmissions power control device according to claim 7, which is characterized in that in the quiescent drain electricity
When flowing consistent with standard drain current, the radiofrequency signal input of radio-frequency power amplifier is opened, judgement passes through power detecting unit
Whether the transmission power detected is shown with configuration transmission power one determines that the fine tuning to adjustable attenuator operates.
9. rfid transmissions power control device according to claim 6, which is characterized in that the trigger unit passes through
Power detecting unit monitors transmission power, when the difference of the transmission power and configuration transmission power is more than second threshold, touching
Send out the adjustment to the radio-frequency power amplifier；Or setting period first time, it is touched according to the first time loop cycle
Send out the adjustment to the radio-frequency power amplifier.
10. rfid transmissions power control device according to claim 6, which is characterized in that in the adjustment unit
In, corresponding first operator of the temperature range is according to the radio-frequency power amplifier of same batch or same model in same temperature
Several sampled points in degree section correspond to detection data and are fitted, and the first operator of foundation is stored in advance to call.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810996099.3A CN109088645A (en) | 2018-08-29 | 2018-08-29 | Rfid transmissions Poewr control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810996099.3A CN109088645A (en) | 2018-08-29 | 2018-08-29 | Rfid transmissions Poewr control method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109088645A true CN109088645A (en) | 2018-12-25 |
Family
ID=64795059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810996099.3A Pending CN109088645A (en) | 2018-08-29 | 2018-08-29 | Rfid transmissions Poewr control method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109088645A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109815754A (en) * | 2019-01-11 | 2019-05-28 | 南京南瑞微电子技术有限公司 | A kind of reader RFID transmission power adaptation control method |
| CN110446247A (en) * | 2019-07-04 | 2019-11-12 | 维沃移动通信有限公司 | Signal control circuit, method and terminal device |
| CN110661539A (en) * | 2019-09-20 | 2020-01-07 | 锐捷网络股份有限公司 | Data receiving circuit, method, device, equipment and medium |
| CN110728338A (en) * | 2019-09-26 | 2020-01-24 | 北京智博晟源科技有限公司 | RFID reader-writer system and power calibration method |
| CN111769806A (en) * | 2020-06-05 | 2020-10-13 | 佛山市联动科技股份有限公司 | Power stabilizing method for power amplifier |
| CN112710907A (en) * | 2019-10-24 | 2021-04-27 | 苏州华太电子技术有限公司 | Power amplifier test method, power amplifier test system and computer readable storage medium |
| CN112865820A (en) * | 2020-12-31 | 2021-05-28 | 深圳市极致汇仪科技有限公司 | Method and system for optimizing temperature and frequency domain compensation attenuator |
| CN114630349A (en) * | 2022-03-18 | 2022-06-14 | 深圳绿米联创科技有限公司 | Control method, device, system, electronic equipment and storage medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401517A (en) * | 2013-08-15 | 2013-11-20 | 杭州威力克通信系统有限公司 | Radio frequency power amplifier system |
-
2018
- 2018-08-29 CN CN201810996099.3A patent/CN109088645A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401517A (en) * | 2013-08-15 | 2013-11-20 | 杭州威力克通信系统有限公司 | Radio frequency power amplifier system |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109815754A (en) * | 2019-01-11 | 2019-05-28 | 南京南瑞微电子技术有限公司 | A kind of reader RFID transmission power adaptation control method |
| CN109815754B (en) * | 2019-01-11 | 2022-02-01 | 南京杰思微电子技术有限公司 | RFID (radio frequency identification) transmission power self-adaptive control method for reader-writer |
| CN110446247A (en) * | 2019-07-04 | 2019-11-12 | 维沃移动通信有限公司 | Signal control circuit, method and terminal device |
| CN110661539A (en) * | 2019-09-20 | 2020-01-07 | 锐捷网络股份有限公司 | Data receiving circuit, method, device, equipment and medium |
| CN110661539B (en) * | 2019-09-20 | 2021-09-14 | 锐捷网络股份有限公司 | Data receiving circuit, method, device, equipment and medium |
| CN110728338A (en) * | 2019-09-26 | 2020-01-24 | 北京智博晟源科技有限公司 | RFID reader-writer system and power calibration method |
| CN112710907A (en) * | 2019-10-24 | 2021-04-27 | 苏州华太电子技术有限公司 | Power amplifier test method, power amplifier test system and computer readable storage medium |
| CN111769806B (en) * | 2020-06-05 | 2023-08-18 | 佛山市联动科技股份有限公司 | Power stabilizing method of power amplifier |
| CN111769806A (en) * | 2020-06-05 | 2020-10-13 | 佛山市联动科技股份有限公司 | Power stabilizing method for power amplifier |
| CN112865820A (en) * | 2020-12-31 | 2021-05-28 | 深圳市极致汇仪科技有限公司 | Method and system for optimizing temperature and frequency domain compensation attenuator |
| CN112865820B (en) * | 2020-12-31 | 2022-06-24 | 深圳市极致汇仪科技有限公司 | Method and system for optimizing temperature and frequency domain compensation attenuator |
| CN114630349A (en) * | 2022-03-18 | 2022-06-14 | 深圳绿米联创科技有限公司 | Control method, device, system, electronic equipment and storage medium |
| CN114630349B (en) * | 2022-03-18 | 2024-04-09 | 深圳绿米联创科技有限公司 | Control method, device, system, electronic equipment and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109088645A (en) | Rfid transmissions Poewr control method and device | |
| CN100582801C (en) | Batch detector methods and apparatus of power amplifier | |
| US7821273B2 (en) | Circuit for detecting the impedance of a load | |
| CN106304304B (en) | Rfid transmissions Poewr control method and device | |
| CN103444076B (en) | For the group delay calibration steps of power amplifier envelope-tracking | |
| US20090179704A1 (en) | Load insensitive balanced power amplifier and related operating method | |
| KR102245944B1 (en) | Method for testing sensitivity of data packet signal transceiver | |
| US20110269416A1 (en) | Transmitter | |
| CN101958756A (en) | Standing wave detection method, standing wave detection device and base station | |
| CN101233654A (en) | Method and system for self-calibrating transmit power | |
| CN106130579B (en) | The automatic controlling method for gain and device of millimeter-wave transmitter | |
| Wu et al. | Residual neural networks for digital predistortion | |
| US20190165469A1 (en) | In-situ active impedance characterization of scanned array antennas | |
| CN103592565A (en) | Position detection method and device for fault of cable | |
| CN104270208B (en) | Method and device for detecting standing-wave ratio of RRU | |
| CN101959217A (en) | Standing wave detection method, standing wave detection device and base station | |
| US20060116857A1 (en) | Method and apparatus for model extraction | |
| US6839657B2 (en) | Method of and an arrangement for characterizing non-linear behavior of RF and microwave devices in a near matched environment | |
| CN107994958A (en) | A kind of the channel phase consistency debugging system and method for broadband detecting receiver | |
| CN104133169A (en) | Non-contact chip test system and method | |
| CN107944312A (en) | A kind of RFID reader receiving sensitivity detection method and device | |
| US7274749B2 (en) | Method and apparatus for the linearization of a radio frequency high-power amplifier | |
| CN109951244B (en) | Power measurement and radio frequency receiving gain control method applied to channel simulator | |
| CN208723878U (en) | Rfid transmissions power control circuit | |
| CN207251564U (en) | A kind of high-power output system of adaptive amplitude-phase uniformity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181225 |
|
| RJ01 | Rejection of invention patent application after publication |