CN102739273B - Dynamical impedance matching method and communication device - Google Patents
Dynamical impedance matching method and communication device Download PDFInfo
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- CN102739273B CN102739273B CN201110086242.3A CN201110086242A CN102739273B CN 102739273 B CN102739273 B CN 102739273B CN 201110086242 A CN201110086242 A CN 201110086242A CN 102739273 B CN102739273 B CN 102739273B
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Abstract
The invention discloses a dynamical impedance matching method and a communication device. The dynamical impedance matching method comprises the steps of switching an impedance matching circuit of the communication device to an operation frequency band; giving tuning voltages with a first number to a first element of the impedance matching circuit, and selecting one from the tuning voltages with the first number as the operation voltage of the first element; and giving tuning voltages with a second number to a second element of the impedance matching circuit, and selecting one from the tuning voltages with the second number as the operation voltage of the second element, wherein the first number is different from the second number.
Description
Technical field
The present invention relates to a kind of method and communication device for carrying out impedance matching, more particularly to a kind of dynamic carries out impedance
The method and communication device of matching.
Background technology
Communication device such as mobile phone, intelligent mobile phone, e-book, tablet PC or other wireless communication apparatus, at place
When under different environment or by user gripping or be close, all the effect for communicating can be affected.And
In the case of serious, in fact it could happen that the situation such as reception quality is bad, signal is faint, phone is missed.Such as some intelligence on the market
, there is face or signal shielding is likely to result in when with hand-tight holding, therefore have to send customer's mobile phone protective cover in type mobile phone, with
Mitigate the bad problem of reception.
Thus, user can produce bad use experience to this communication device.
The content of the invention
The invention relates to dynamic carries out the method and communication device of impedance matching.Communication device dynamic carries out impedance
Matching, may be used to compensate under certain state, grip or in the state of for instance in a certain environment or by user, right
Impact produced by impedance matching, so as to contribute to maintaining good communication quality.
According to an aspect of the invention, it is proposed that a kind of dynamic carries out the embodiment of the method for impedance matching.For a communication
One impedance matching circuit of device：The tuning of one first number is carried out to one first element of this impedance matching circuit；And it is right
One second element of this impedance matching circuit carries out the tuning of one second number, wherein first number is different from this second number.
A kind of embodiment in this respect of the invention described above is as follows.Switch an impedance matching circuit of a communication device extremely
One operational frequency bands.One first element to impedance matching circuit, gives the VT of one first number, and from the first number
One of them is chosen in VT as the operating voltage of the first element.One second element to impedance matching circuit, gives
The VT of one second number, and one of them is chosen from the VT of one second number as the operation of the second element
Voltage, wherein the first number is different from the second number.
A kind of embodiment in this respect of the invention described above is as follows.Switch an impedance matching circuit of a communication device extremely
One operational frequency bands.Export one first control end to the first control signal of one first control signal to impedance matching circuit
First parameter carries out the setting that number of times is one first number, and chooses from the setting value of the first parameter that number is the first number
One of them is with the operation signal of the first control end of generation.Export one second control of one second control signal to impedance matching circuit
End processed one second parameter to the second control signal carry out the setting that number of times is one second number, and are the second number from number
The second parameter setting value in choose one of them with produce the second control end operation signal, wherein the first number is different from
Second number.
According to a further aspect in the invention, propose an a kind of embodiment of communication device.This communication device includes：One day
Line, an impedance matching circuit, a detection circuit and a control unit.Impedance matching circuit, is coupled with antenna, impedance matching electricity
Road has multiple control ends to control the impedance of this impedance matching circuit.Detection circuit, couples so far impedance matching circuit, produces
One feedback signal.Control unit, switches an impedance matching circuit a to operational frequency bands of a communication device, and output one first is controlled
One first control end of signal to these control ends is to carry out the setting that number of times is one first number, and is the first number from number
The first parameter setting value in choose one of them with produce the first control end operation signal.Control unit output one second
One second control end in control signal to these control ends one second parameter to the second control signal carries out number of times for one
The setting of the second number, and one of them is chosen from the setting value of the second parameter that number is the second number to produce the second control
The operation signal at end processed, wherein the first number is different from the second number.
More preferably understand to have to the above-mentioned and other aspect of the present invention, some embodiments cited below particularly, and combine attached
Figure describes in detail as follows.
Description of the drawings
Fig. 1 is the block chart of an embodiment of the communication device that dynamic carries out impedance matching.
Fig. 2A is the flow chart of an embodiment of the method that dynamic carries out impedance matching.
Fig. 2 B are the flow chart of another embodiment of the method that dynamic carries out impedance matching.
Fig. 3 A to Fig. 3 C are the flow chart of the other embodiment of the method that dynamic carries out impedance matching.
Fig. 4 A to Fig. 4 C be the method that impedance matching is carried out into mobile state an embodiment in tuned using control signal
Wave mode embodiment.
Fig. 5 A to Fig. 5 C are the match circuit of the adjustable element of the variable matching circuit that impedance matching is carried out into mobile state
The circuit diagram of embodiment.
Fig. 6 to Fig. 8 is the block chart of the other embodiment of the communication device that dynamic carries out impedance matching.
Reference numeral explanation
10、60、70、80：Communication device
110：Impedance matching circuit
120、620、720、820：Detection circuit
130：Control unit
140：RF transceiver
150、650：Fundamental frequency signal processing unit
ANT：Antenna
P1-PK：Control end
SC1-SCK：Control signal
SR：Feedback signal
SB：The information of frequency band
Z1-Z4：Adjustable element
S10-S40、S110、S120、S140、S210、S220、S230、S240：Step
Specific embodiment
Present aspect provides the embodiment that dynamic carries out the method and communication device of impedance matching.Fig. 1 carries out impedance for dynamic
The block chart of one embodiment of the communication device of matching.In FIG, communication device 10 such as mobile phone, intelligent mobile phone, electronics
Book, tablet PC or other there is the device of wireless telecommunications.Communication device 10 includes：One antenna ANT to reception or sender,
One impedance matching circuit 110, one detects circuit 120 and a control unit 130.Impedance matching circuit 110, with antenna ANT couplings
Connect, with multiple control ends P1, P2...PK to control the impedance of impedance matching circuit 110, can be allowed to substantial with antenna ANT
Realize impedance matching.From for another angle, impedance matching circuit 110 can have adjustable element, such as tunable capacitor, adjustable electric
The circuit constituted by sense or adjustable resistance, such as shown in any embodiment of Fig. 5 A to Fig. 5 C；Or add nonadjustable resistance
Anti- element and become an impedance matching circuit, wherein the RF in Fig. 5 A to Fig. 5 C is represented and is connected to other radio circuits, ANT tables
Show.Detection circuit 120, is coupled to impedance matching circuit 110, produces feedback signal SR.For example, detect circuit
The situation of 120 detection signals reflection, according to the signal intensity of reflected signal, is converted to feedback signal SR, e.g. magnitude of voltage table
Show the degree of signaling reflex；Feedback signal SR is, for example, to be applied to tuned impedance matching.Control unit 130, exportable control letter
Number SC1 to SCK arrives these control ends P1-PK, and to control the impedance of impedance matching circuit 110 to make impedance matching, wherein K is
Integer more than 1.
Additionally, the enforcement based on loop circuit (closed-loop) the tunable circuit structure (shown in dotted line) in Fig. 1
Example, communication device 10 may be embodied as different communication device as escribed above.May also be combined with implementation other circuits and
Element, the RF transceiver 140 illustrated such as Fig. 1 and a fundamental frequency signal processing unit 150.So, dynamic carries out impedance
The circuit implementations of the communication device matched somebody with somebody, not being limited shown in Fig. 1.
According to the present embodiment, 10 dynamic of communication device carries out impedance matching.Fig. 2A is refer to, which is that dynamic carries out impedance
The flow chart of one embodiment of the method for matching.The method can be suitably used for communication device 10, and being allowed to dynamic carries out impedance matching.
Embodiment as shown in Figure 2 A, the method (for example, are communicated for the communication device for operating in an operational frequency bands
(for example, 110) impedance matching circuit, enters to move dynamic impedance matching a device impedance matching circuit 10).The method includes following
Step.As shown in step S20, one first element (such as the element Z3 of Fig. 5 B) to impedance matching circuit carries out one first number
Tuning (tuning).As shown in step S40, one second element (such as the element Z1 of Fig. 5 B, Z2) to impedance matching circuit is carried out
The tuning (for example carrying out the tuning of 3 times and 2 times to element Z1 and Z2 respectively) of one second number, wherein first number is different from the
Two numbers.
In the above-described embodiments, for operating in a certain operational frequency bands, the adjustable element of impedance matching circuit, such as Fig. 5 B
Element Z1, Z2, Z3 in shown impedance matching network, is divided at least two classes.Step S20 and S40, are exactly to this at least two class
Element, the step of carry out the tuning action of different number of times respectively to make impedance matching.In certain embodiments, can perform at least
One or many step S40 is tuned with other adjustable elements sequentially to the second element is can be considered in impedance matching circuit.
And the criterion classified, in certain embodiments, can be according to multiple adjustable elements of impedance matching circuit in a certain behaviour
Make under frequency band, the sensitivity of impedance matching is classified.For example, the first element in step S20 is for this operation frequency
The sensing element of band, and this second element in step S40 is the secondary sensing element for this operational frequency bands.In other words, it is right
In this operational frequency bands, the sensitivity of this first element is higher than the sensitivity of this second element.Further, since the first element is for this
The sensitivity of operational frequency bands is higher, so time number of the number of times tuned in step S20, i.e., first, the can be more than in step S40
Time number of the number of times of the tuning of two element, i.e., second.In other words, the element higher for sensitivity, for the effect of impedance matching
Fruit affects larger, therefore can carry out the tuning of more number of times (such as 3,5 or 10 times), makes the effect of impedance matching more accurate；And it is quick
The relatively low element of sensitivity, i.e., secondary sensing element because or accuracy less for the influential effect of impedance matching is relatively low, therefore can enter
The tuning of row fewer number (relative, for example, 2 or 4 times).Thus, being under different environment or user in communication device
When the mode for being gripped changes, or or even communication device body different parts (such as, but not limited to：Slip lid, entity
QWERT keyboards) when having relative motion, communication device can essentially contribute to compensate various situations to impedance according to the various embodiments described above
The impact of matching, and then contribute to lifting communication quality.
In certain embodiments, for a certain operational frequency bands, the frequency band such as HSPA/WCDMA of such as mobile communication network：
900/2100MHz、GSM：850/900/1800/1900MHz, can be directed in a certain frequency band, according to the information of this operational frequency bands,
And these adjustable elements of impedance matching circuit, for the information of the sensitivity of frequency band, first element higher to sensitivity enters
The tuning of one first number of row.
For example, such as the L-type matching network in Fig. 5 A, for a certain frequency band such as GSM1800, the sensitivity of element Z1 is big
In the sensitivity of element Z2.Therefore for this example, step S20 first carries out the tuning of one first number, Zhi Hou to element Z1
The tuning of one second number is carried out in step S40 to element Z2.And the T-shaped matching network in such as Fig. 5 B, for a certain frequency band
Such as WCDMA：Sensitivity of the sensitivity of 2100, element Z3 more than element Z1 and Z2.Therefore for this example, step S20 is first right
Element Z3 (i.e. the first element) carries out the tuning of one first number, afterwards in step s 40 to (i.e. second yuan of element Z1 and Z2
Part) tuning of each self-corresponding number of times is carried out respectively.π type matching networks in such as Fig. 5 C, low for a certain frequency band such as again
Frequency band, the sensitivity of element Z2 are more than other elements；And for another frequency band such as high frequency band, the sensitivity of element Z4 is more than
Other elements.Therefore for this example, if communication device 10 operates in this low-frequency band, during 10 execution step S20 of communication device, first
The tuning of one first number is carried out to element Z2 (i.e. the first element).If communication device 10 operates in this high frequency band, communication device
During 10 execution step S20, the tuning of one first number which corresponding to is first carried out to element Z4, wherein element Z4 correspondences herein
First number can be corresponding to different previous elements Z2 first number.During for 10 execution step S40 of communication device, also may be used
And so on, for the frequency band that communication device 10 was operated at that time, to other elements (i.e. multiple elements that can be considered the second element)
Carry out the tuning of indivedual corresponding number of times.
These adjustable elements of the above-mentioned information and impedance matching circuit for being related to a certain operational frequency bands are for frequency band
The information of sensitivity, can be by experiment and learns, and among being recordable in communication device 10.For example, for the π types in Fig. 5 C
Matching network, for a certain low-frequency band and a certain high frequency band, such as element Z1 to Z4 represents adjustable element L1, C1, L2, C2 respectively,
During by these adjustable elements of the analog tuner of experiment test or computer, for the impact of signal power, it can be deduced that for example
The data of table one：
Table one
| Element L1 | Element C1 | Element L2 | Element C2 | |
| Low-frequency band | 3dB | 4dB | 1dB | 1dB |
| High frequency band | 0.5dB | 1dB | 2.5dB | 3.5dB |
According to the example of above-mentioned data, can learn for wherein a certain frequency band, that element of impedance matching circuit
It is that for sensing element, wherein numeral is bigger, then for this frequency band, the sensitivity of this element is higher.For example, can be to mobile communication
The frequency band of network such as HSPA/WCDMA：900/2100MHz、GSM：850/900/1800/1900MHz, respectively obtains these frequencies
The information or corresponding relation of band and sensing element.
In certain embodiments, communication device 10 can be according to the information of operational frequency bands and the information of sensing element or corresponding
Relation, the dynamic of execution Fig. 2A carry out the embodiment of the method for impedance matching.For example in the other embodiment based on Fig. 2A, can
To comprise the following steps.Fig. 2 B are refer to, as shown in step S10, according to the information and these adjustable elements of this operational frequency bands
For the information of the sensitivity of frequency band, decision proceeds by tuning from one first element (such as the Z3 of Fig. 5 B).That is, determining
First carry out step S20 in Fig. 2A, then execution step S40.In certain embodiments, step S40 at least one times can then be performed
It is tuned with other adjustable elements sequentially to the second element is can be considered in impedance matching circuit.Again in some instances, example
Such as realized with step S30, for this operational frequency bands, determined according to above-mentioned information or from other adjustable elements to these other
One second element (such as the Z1 of Fig. 5 B, Z2) in adjustable element is tuned.
And according to above-mentioned Fig. 2A, the control unit 130 of communication device 10 may be used to realize that dynamic carries out many of impedance matching
Individual embodiment.
Above-mentioned steps S20 or S40 carry out certain once to an adjustable element (such as the element Z3 of Fig. 5 B) of impedance matching circuit
Several tunings can be realized in various manners.For example, refer to shown in Fig. 3 A, dynamic carries out another reality of the method for impedance matching
Apply example.The method is comprised the following steps.In step s 110, switch an impedance matching circuit of a communication device to an operation frequency
Band.In the step s 120, one first element to impedance matching circuit, gives the VT of one first number, and from first
One of them is chosen in the VT of number as the operating voltage of the first voltage-controlled element.In step S140, to impedance
One second element with circuit, gives the VT of one second number, and chooses wherein from the VT of the second number
One of as the second voltage-controlled element operating voltage, wherein the first number be different from the second number.The step of the present embodiment S120
And S140 can be respectively seen as a kind of implementation of step S20 and S40 in the embodiment of Fig. 2A or Fig. 2 B, be especially adapted for use in
Adjustable element is the example of voltage-controlled element.Such as in the embodiment of Fig. 4 A, sequentially give in a certain time interval or with a frequency
The multiple VTs of an adjustable element are given, and one are therefrom chosen as operating voltage.Additionally, in other embodiments, may be used also
The VT of each first number of correspondence (or second number), each self-corresponding feedback letter of sequentially self-impedance match circuit acquirement
Number, to match in tuned impedance using feedback signal.
Additionally, for the impedance matching circuit 110 in Fig. 1, may be implemented as an integrated circuit or an integrated circuit
A part, which has multiple control ends P1, P2...PK, may be used to control the impedance of impedance matching circuit 110.So, control is single
130 exportable control signal SC1 to SCK of unit control the impedance of impedance matching circuits 110 to make impedance matching to these control ends.
Refer to shown in Fig. 3 B, dynamic carries out another embodiment of the method for impedance matching.The method is comprised the following steps.
In step s 110, switch an impedance matching circuit of a communication device to an operational frequency bands.In step S220, output one the
One first control end (such as P1) of one control signal to impedance matching circuit (such as 110) and to the first control signal (for example
SC1 one first parameter) carries out the setting that number of times is one first number, and from the setting of the first parameter that number is the first number
The operation signal that one of them is chosen in value to produce the first control end.In step S240, one second control signal (example is exported
Such as SC2, SC3 etc.) to impedance matching circuit one second control end (such as P2, P3 etc.) and to the second control signal one second
Parameter carries out the setting that number of times is one second number, and chooses wherein from the setting value of the second parameter that number is the second number
One of with produce the second control end operation signal, wherein the first number be different from the second number.The step of the present embodiment S220
And S240 can be respectively seen as a kind of implementation of step S20 and S40 in the embodiment of Fig. 2A or Fig. 2 B.This kind of implementation
Impedance matching circuit is applicable to using a parameter of control signal to control the occasion of adjustable element, first and second parameter example
The parameter of amplitude, electric current, phase contrast or frequency or other signals of telecommunication such as control signal, or the number included by control signal
Value.Additionally, depending on apparent impedance match circuit embodiment, first and second parameter can be same parameter or different types of
Parameter.
Because the internal adjustable element in impedance matching circuit is not necessarily designer and is learnt, so, according to Fig. 1
Communication device 10 and Fig. 3 A method to realize when, make control unit 130 export appropriate control signal and make appropriate
The parameter of setting control signal may achieve multiple tuning.For example impedance matching circuit 110 adopts voltage-controlled mode, then
The parameter (i.e. magnitude of voltage) of control signal can accordingly in tuned impedance match circuit internal adjustable element impedance.And
The a certain number of times of size of the parameter of a certain control signal is set, then this number can be carried out to the impedance of a certain internal adjustable element
Tuning.For example shown in Fig. 4 A to Fig. 4 C, be to make the embodiment of wave mode that tunes using control signal, wherein with it is different when
Section, the level of control signal sets once, that is, is once tuned.In addition, impedance matching circuit be for example capable of achieving be
With three control ends, respectively correspond to three adjustable elements such as Fig. 5 B, such as Z1-Z3 represent respectively tunable capacitor C1, C2 and
C3, wherein tunable capacitor each have respective adjustable extent, and such as adjustable extent of tunable capacitor C1 is 2.7pF to 8.2pF；
The adjustable extent of tunable capacitor C2 is 0.8pF to 2.2pF；The adjustable extent of tunable capacitor C3 is 0.9pF to 2.7pF.
And multiple control ends can each correspond to an adjustable element, example as shown in Figure 5 A to FIG. 5 C.So, one
In a little embodiments, the embodiment of the executable method that impedance matching is carried out based on the dynamic of Fig. 2 B and Fig. 3 B of communication device 10.Figure
3C show the embodiment that dynamic carries out the method for impedance matching.In step S210, according to an operational frequency bands information with
And adjustable element determines one first control from these control ends of impedance matching circuit for the information of the sensitivity of frequency band
End proceeds by tuning.That is, determining to first carry out step S220 in Fig. 3 B, then execution step S240.In some enforcements
In example, can then perform step S240 at least one times with distinctly to can be considered in impedance matching circuit the second element other are adjustable
Element is tuned.Again in some instances, for example realized with step S230, for this operational frequency bands, according to above-mentioned information
Or determine to adjust one second element in these other adjustable elements from other adjustable elements (such as the Z1 of Fig. 5 B, Z2)
It is humorous.Additionally, in other embodiments, can also correspond to the setting of the number for the first number (or second number) of each the first parameter
Value, each self-corresponding feedback signal of sequentially self-impedance match circuit acquirement, to match in tuned impedance using feedback signal.
And according to above-mentioned Fig. 3 A- Fig. 3 C, the control unit 130 of communication device 10 also may be used to realize that dynamic carries out impedance
The multiple embodiments matched somebody with somebody.
Hereinafter also propose that dynamic carries out the other embodiment of the communication device of impedance matching.
Fig. 6 show another embodiment that dynamic carries out the communication device of impedance matching.In figure 6, a communication device 60
Including：One antenna ANT, the detection circuit 620 of an impedance matching circuit 110, a RF transceiver 140 and a fundamental frequency signal
Processing unit 650.Fig. 6 and Fig. 1 are similarly：One end of detection circuit 120 or 620 is coupled to antenna ANT and impedance matching electricity
Between road 110.And communication device 60 with the difference of communication device 10 is：The fundamental frequency signal processing unit 650 of communication device 60
Output control signal SC1 to SCK is controlling impedance matching circuit 110；And the other end coupling of the detection circuit 620 of communication device 60
It is connected to fundamental frequency signal processing unit 650.For this embodiment, according to Fig. 1, can be considered the control unit 130 of communication device 10
Function or among circuit can be incorporated into fundamental frequency signal processing unit 150.
Fig. 7 show another embodiment that dynamic carries out the communication device of impedance matching.In the figure 7, a communication device 70
Including：One antenna ANT, the detection circuit 720 of an impedance matching circuit 110, a control unit 130, a RF transceiver 140
And a fundamental frequency signal processing unit 150.The communication device 70 of Fig. 7 with the difference of the communication device 10 of Fig. 1 is：Communication device
One end of 70 detection circuit 720 is coupled between RF transceiver 140 and impedance matching circuit 110, so that detection circuit 720
The situation of detection signal reflection, and produce feedback signal SR.As other elements are all identical, therefore repeat no more.
Fig. 8 show another embodiment that dynamic carries out the communication device of impedance matching.In fig. 8, a communication device 80
Including：One antenna ANT, the detection circuit 820 of an impedance matching circuit 110, a RF transceiver 140 and a fundamental frequency signal
Processing unit 650.Fig. 8 and Fig. 7 are similarly：One end of detection circuit 820 or 720 is coupled to RF transceiver 140 and impedance
Between match circuit 110, so that the situation of detection circuit 820 or the reflection of 720 detection signals, and produce feedback signal SR.And lead to
Interrogating device 80 with the difference of communication device 70 is：650 output control signal SC1 of fundamental frequency signal processing unit of communication device 80
To SCK controlling impedance matching circuit 110；And the other end of the detection circuit 820 of communication device 80 is coupled at fundamental frequency signal
Reason unit 650, with reset signal SR.For this embodiment, according to Fig. 7, can be considered the control unit of communication device 70
Among 130 function or circuit can be incorporated into fundamental frequency signal processing unit 150.
In the embodiment according to some embodiments and Fig. 1 or Fig. 7 of above-mentioned Fig. 2A -2B or Fig. 3 A-3C, control unit
130 couple to obtain the information of operational frequency bands with fundamental frequency signal processing unit 150.Additionally, in other embodiments, operational frequency bands
Information also can be built into control unit 130 among or by other circuits for example memorizer read.
In addition, above-mentioned control unit 130 or fundamental frequency signal processing unit 150 or 650, using such as processor, numeral
Signal processor, or with programmable integrated circuit such as microcontroller, element programmable gate array (FPGA, Field
Programmable Gate Array) or ASIC (application specific integrated
Circuit, ASIC) etc circuit realizing.
In addition, in the above-described embodiments, it is that, so that the first element is as sensing element as an example, but the present invention is not limited to this,
In other embodiments, in step S20, S120 or S220, the first element can be defined as low for the sensitivity of operational frequency bands
In this second element for the sensitivity of operational frequency bands.Thus, first number (or first number) can be made less than second number
(or second number).That is, in these embodiments, can be first relatively low to sensitivity according to step S20, S120 or S220
Adjustable element is tuned, then in step S40, S140 or S240 again to being probably that the higher adjustable element of sensitivity is adjusted
It is humorous.
Dynamic as above carries out the embodiment of the method and communication device of impedance matching.In communication device in difference
In the environment of or the mode that gripped of user when changing, or or even the different parts of body of communication device have relative motion
When, it is likely to produce the situation of impedance mismatch.Communication device substantially dynamically can contribute to according to the various embodiments described above
Compensation service condition changes the caused impact to communication effect, and then contributes to lifting communication quality.In certain embodiments,
As first higher to sensitivity adjustable element is tuned, so can accelerate dynamic carries out the speed of impedance matching.
In sum, although the present invention is disclosed as above with embodiment, and so which is not limited to the embodiment party of the present invention
Formula.Those skilled in the art, on the premise of according to the spirit and scope of the present invention, can be used for a variety of modifications and variations.Cause
This, protection scope of the present invention is defined by the claim of the present invention.
Claims (17)
1. a kind of method that dynamic carries out impedance matching, the method include：
Switch an impedance matching circuit of a communication device to an operational frequency bands；
One first element to the impedance matching circuit, gives the VT of one first number, and from the tune of first number
One of them is chosen in humorous voltage as the operating voltage of first element；And
One second element to the impedance matching circuit, gives the VT of one second number, and from the tune of second number
One of them is chosen in humorous voltage as the operating voltage of second element, wherein first number is different from second number；
Wherein under the operational frequency bands, first element for impedance matching sensitivity higher than second element for impedance
The sensitivity of matching, and first number is more than second number, first element is the sensing element for the operational frequency bands,
Second element is the secondary sensing element for the operational frequency bands.
2. the method that dynamic as claimed in claim 1 carries out impedance matching, also includes:
According to the information and first element and second element of the operational frequency bands for the information of the sensitivity of frequency band, determine
Tuning is proceeded by from first element；
After the step of wherein this gives the VT of first number performs, the VT for giving second number is performed
The step of.
3. the method that dynamic as claimed in claim 1 carries out impedance matching, wherein give the VT of first number
Step is sequentially to give first element with a frequency, and the VT of first number is different from each other.
4. the method that dynamic as claimed in claim 1 carries out impedance matching, also includes：
The VT of corresponding each first number, sequentially obtains each self-corresponding feedback signal from the impedance matching circuit.
5. a kind of method that dynamic carries out impedance matching, the method include：
Switch an impedance matching circuit of a communication device to an operational frequency bands；
Export one first control end to first control signal one of one first control signal to the impedance matching circuit
One parameter carries out the setting that number of times is one first number, and selects from the setting value of first parameter that number is first number
Take one of them to produce the operation signal of first control end；And
Export one second control end to second control signal one of one second control signal to the impedance matching circuit
Two parameters carry out the setting that number of times is one second number, and select from the setting value of second parameter that number is second number
One of them is taken to produce the operation signal of second control end, wherein first number is different from second number；Wherein
First number is more than second number, and, to control one second element of the impedance matching circuit, this for second control end
One control end is the sensitivity unit for the operational frequency bands to control one first element of the impedance matching circuit, first element
Part, second element are the secondary sensing element for the operational frequency bands, and under the operational frequency bands, first element is for impedance
The sensitivity of matching is higher than second element for the sensitivity of impedance matching.
6. the method that dynamic as claimed in claim 5 carries out impedance matching, also includes：
According to first element and second element of the information and the impedance matching circuit of the operational frequency bands for frequency band
The information of sensitivity, determines to proceed by tuning from first control end of the impedance matching circuit；
The step of wherein carrying out the setting that number of times is second number, performs in the step for carrying out the setting that number of times is first number
After rapid.
7. the method that dynamic as claimed in claim 5 carries out impedance matching, wherein carrying out the setting that number of times is first number
The step of be sequentially to be set with a frequency, and the number of first parameter be first number setting value it is different from each other.
8. the method that dynamic as claimed in claim 5 carries out impedance matching, also includes：
The number of corresponding each first parameter is the setting value of first number, sequentially obtains respective from the impedance matching circuit
Corresponding feedback signal.
9. a kind of communication device, the communication device include：
One antenna；
One impedance matching circuit, is coupled with the antenna, and the impedance matching circuit has multiple control ends to control the impedance matching
The impedance of circuit；
One detection circuit, is coupled to the impedance matching circuit, produces a feedback signal；And
One control unit, switches the impedance matching circuit of the communication device to an operational frequency bands, exports one first control signal
One first control end to these control ends is to carry out the setting that number of times is one first number, and is first number from number
One of them is chosen in the setting value of one first parameter to produce the operation signal of first control end；The control unit output one
One second control end in second control signal to these control ends one second parameter to second control signal enters places
Number for one second number settings, and from the setting value of second parameter that number is second number choose one of them with
The operation signal of second control end is produced, wherein first number is different from second number；Wherein first number is more than
Second number, to control one first element of the impedance matching circuit, second control end is to control for first control end
Make one second element of the impedance matching circuit, first element is the sensing element for the operational frequency bands, second element
It is the secondary sensing element for the operational frequency bands, under the operational frequency bands, first element is for the sensitivity of impedance matching
Higher than second element for the sensitivity of impedance matching.
10. communication device as claimed in claim 9, the wherein control unit according to the operational frequency bands information and this first
Element exports first control signal to first control end and to this with second element for the information of the sensitivity of frequency band
First parameter of first control signal carries out the setting that number of times is first number.
11. communication devices as claimed in claim 9, the wherein control unit sequentially carry out number of times as first number with a frequency
Purpose sets, and the number of first parameter be the setting value of first number be different from each other.
12. communication devices as claimed in claim 9, one end of the wherein detection circuit are coupled to the antenna and the impedance matching
Between circuit, the other end of the detection circuit is coupled to the control unit.
13. communication devices as claimed in claim 12, the wherein communication device also include：One fundamental frequency signal processing unit, should
Control unit is coupled with the fundamental frequency signal processing unit.
14. communication devices as claimed in claim 12, the wherein control unit are that a fundamental frequency signal of the communication device is processed
Unit.
15. communication devices as claimed in claim 9, the wherein communication device also include：One RF transceiver, couples the impedance
Match circuit, one end of the wherein detection circuit are coupled between the RF transceiver and the impedance matching circuit, the detection electricity
The other end on road is coupled to the control unit.
16. communication devices as claimed in claim 15, the wherein communication device also include：One fundamental frequency signal processing unit, should
Control unit is coupled with the fundamental frequency signal processing unit.
17. communication devices as claimed in claim 15, the wherein control unit are that a fundamental frequency signal of the communication device is processed
Unit.
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| CN201110086242.3A CN102739273B (en) | 2011-04-07 | 2011-04-07 | Dynamical impedance matching method and communication device |
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| CN102739273B true CN102739273B (en) | 2017-04-12 |
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| CN103746680B (en) * | 2013-12-31 | 2017-01-25 | 北京朗波芯微技术有限公司 | Radio frequency switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2151921A1 (en) * | 2008-08-07 | 2010-02-10 | Epcos AG | Dynamic impedance matching network and method for matching an impedance between a source and a load |
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| US20080129610A1 (en) * | 2006-12-01 | 2008-06-05 | Texas Instruments Incorporated | Adaptive antenna matching for portable radio operating at VHF with single-chip based implementation |
| ITMI20070152A1 (en) * | 2007-01-31 | 2008-08-01 | St Microelectronics Srl | CIRCUIT TO ADAPT THE LEARNING OF THE LOADING OF AN ELECTRONIC DEVICE |
| US7786819B2 (en) * | 2007-08-31 | 2010-08-31 | Nokia Corporation | Apparatus comprising an antenna element, which efficiently performs at both a first resonant frequency band and a second resonant frequency band, method and computer program therefore |
| US8072285B2 (en) * | 2008-09-24 | 2011-12-06 | Paratek Microwave, Inc. | Methods for tuning an adaptive impedance matching network with a look-up table |
| DE102009024747A1 (en) * | 2009-01-22 | 2010-07-29 | Epcos Ag | Adaptive impedance matching circuit and adaptation method for duplexing standards |
| US8963611B2 (en) * | 2009-06-19 | 2015-02-24 | Qualcomm Incorporated | Power and impedance measurement circuits for a wireless communication device |
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| EP2151921A1 (en) * | 2008-08-07 | 2010-02-10 | Epcos AG | Dynamic impedance matching network and method for matching an impedance between a source and a load |
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| Title |
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| Adaptive Impedance-Matching Techniques for Controlling L Networks;VAN BEZOOIJEN A ET AL;<IEEE TRANSACATIONS ON CIRCUITS AND SYSTEMS-I:REGULAR PAPERS>;IEEE;20100201;第57卷(第2期);495-505 * |
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