CN202586884U - Adaptive impedance matching module - Google Patents
Adaptive impedance matching module Download PDFInfo
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- CN202586884U CN202586884U CN 201220138565 CN201220138565U CN202586884U CN 202586884 U CN202586884 U CN 202586884U CN 201220138565 CN201220138565 CN 201220138565 CN 201220138565 U CN201220138565 U CN 201220138565U CN 202586884 U CN202586884 U CN 202586884U
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Abstract
The utility model discloses an adaptive impedance matching module. The module comprises an adjustable matching unit and a main control unit. The module is characterized in that: a first power detector unit and a second power detector unit are also comprised; the adjustable matching unit comprises an adjustable matching network and a controllable power supply subunit. The matching module of the utility model carries out real-time matching adjustment on a pre-stage circuit and a post-stage circuit of two ends of the matching network through detecting a power parameter of transmission signals, which means that a current radio frequency power measurement chip is used to detect the power of the transmission signals of two ends of the adjustable matching unit and the power parameter is used to carry out adaptive adjustment. The current detection chip can be directly used to detect the power so that detection precision is increased. During a detection process, a directional coupler is not needed so that a module area is reduced. The measured parameter can be directly used to carry out adjustment so that subsequent complex parameter programming algorithm processing is saved and an adjustment rate of the module is increased.
Description
Technical field
The utility model belongs to the signal transmission control technique field in the wireless radiofrequency communication system, is specifically related to a kind of design of self adaptation impedance matching module.
Background technology
Impedance matching is a part important in the microwave electronics, is mainly used in the transmission of signal or energy, makes all microwave signals all can be sent to POL by signal source, does not have signal or energy reflection is returned, thereby promotes the transmission benefit.Promptly the purpose of coupling is in order to guarantee that signal energy is sent to load from signal source effectively.
Communication system is in practical application; Usually can run into each cascade circuit causes the impedance matching imbalance because of various factors generation; Such as mobile phone the reception of signal with send in usually can contact and cause system matches to be lacked of proper care because of surrounding environment and user's human body; The information source energy can not effectively transmit, thereby the self adaptation impedance matching module can be constantly regulated the match condition of match circuit automatically and guaranteed that signal effectively is sent to loaded antenna by signal source.
Self adaptation impedance matching at present mainly contains following several kinds of embodiments: at US Patent, No.4,356,458 with US Patent, mention the reflection coefficient that utilizes the detected transmission signal among the No.2007/0232249; At document IDA Jun-ichi TAKADA Takeshi TODA Yasuyuki OISHI; An adaptive impedance matching system and its application to mobile antennas; IEEE Transactions on Antennas and Propagation; 21-24 Nov.2004 mentions the incident/reflected voltage that utilizes the detected transmission signal among the 543-546 Vol.3; At US Patent, No.2008/0266021 mentions the impedance detection of utilizing load.There is problem usually in above-mentioned several kinds of self adaptation impedance matching schemes: 1. follow-up parameter processing requirements needs the complicated parameter programming to calculate than higher, therefore is unfavorable for the conditioned reaction speed of self adaptation impedance matching module; 2. need to combine directional coupler to detect, caused module area bigger.3. the collection of signal is higher to technological requirement, is unfavorable for improving the accuracy of detection of parameter.
The utility model content
The purpose of the utility model is in order to solve the problems referred to above that existing self adaptation impedance matching module exists, to have proposed a kind of self adaptation impedance matching module.
The technical scheme of the utility model is: a kind of self adaptation impedance matching module comprises: adjustable matching unit, the first power detector unit, second power detector unit and the main control unit, wherein,
The input of described adjustable matching unit is as the input of self adaptation impedance matching module, and the output of said adjustable matching unit is as the output of self adaptation impedance matching module;
The input of the described first power detector unit links to each other with the input of adjustable matching unit;
The output of the described first power detector unit is connected to described main control unit detected first power signal is input to described main control unit;
The input of the described second power detector unit links to each other with the output of adjustable matching unit;
The output of the described second power detector unit is connected to described main control unit detected second power signal is input to described main control unit;
Described main control unit links to each other with adjustable matching unit, regulates adjustable matching unit according to detected first power signal and second power signal.
Further; Said adjustable matching unit comprises adjustable matching network and controllable electric power subelement; Said main control unit links to each other with the controllable electric power subelement; According to the voltage of detected first power signal and second power signal adjusting controllable electric power subelement, said controllable electric power subelement links to each other with the adjustable terminal of adjustable matching network, is used to regulate adjustable matching network.
Further, the described first power detector unit and the second power detector unit are specifically realized through the rf power measurement chip.
The beneficial effect of the utility model: the self adaptation impedance matching module of the utility model is through the power parameter of detected transmission signal; Preceding late-class circuit to the matching network two ends carries out real-time match and regulate; Promptly utilize the watt level of the adjustable matching unit of existing rf power measurement chip detection two ends transmission signals; Utilize power parameter to carry out self adaptation and regulate, owing to adopting existing detection chip directly power to be detected thereby having improved accuracy of detection; In the process that detects, do not need the participation of directional coupler, thereby dwindled module area, and can directly utilize the parameter of surveying to regulate, saved follow-up complicated parameter programmed algorithm processing, thereby improved the regulations speed of module.
Description of drawings
Fig. 1 is the structural representation of the self adaptation impedance matching module of the utility model.
Fig. 2 is the application sketch map of self adaptation impedance matching module in loaded antenna of the utility model.
Fig. 3 is the structural representation of adjustable matching network among the embodiment.
Fig. 4 is the structural representation of power detector unit among the embodiment.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the technical scheme of the utility model is set forth in detail.
The structural representation of the self adaptation impedance matching module of the utility model is as shown in Figure 1, comprising: adjustable matching unit, the first power detector unit, second power detector unit and the main control unit, wherein,
The input of described adjustable matching unit is as the input of self adaptation impedance matching module, and the output of said adjustable matching unit is as the output of self adaptation impedance matching module;
The input of the described first power detector unit links to each other with the input of adjustable matching unit;
The output of the described first power detector unit is connected to described main control unit detected first power signal is input to described main control unit;
The input of the described second power detector unit links to each other with the output of adjustable matching unit;
The output of the described second power detector unit is connected to described main control unit detected second power signal is input to described main control unit;
Described main control unit links to each other with adjustable matching unit, regulates adjustable matching unit according to detected first power signal and second power signal.
As shown in Figure 1; The adjustable matching unit here can adopt following a kind of mode; Comprise adjustable matching network and controllable electric power subelement, main control unit links to each other with the controllable electric power subelement, according to the voltage of detected first power signal and second power signal adjusting controllable electric power subelement; Said controllable electric power subelement links to each other with the adjustable terminal of adjustable matching network, is used to regulate adjustable matching network.
The first power detector unit here and the second power detector unit are specifically realized through the rf power measurement chip.
The basic thought of the utility model is: utilize the first power detector unit and the second power detector unit to detect the size of adjustable matching network two ends signal power respectively; According to the power parameter of being surveyed; Through the main control unit calculation optimization, realize the real-time match and regulate of self adaptation impedance matching module.
Concrete, adjustable matching unit is connected between the input and output of self adaptation impedance matching module, the impedance matching before main the completion between the late-class circuit; The first power detector unit is connected between signal reception/transmitting terminal and the adjustable matching unit, the main detection of accomplishing adjustable matching network front end transmitted signal power; The second power detector unit is connected between the output of adjustable matching network and self adaptation impedance matching module, the main detection of accomplishing adjustable matching network rear end transmitted signal power; Main control unit is connected between the first power detector unit, the second power detector unit and the adjustable matching unit three; The main regulation and control of accomplishing each unit in the self adaptation impedance matching module; And to the processing of adjustable matching unit front and back end institute power scale parameter; The processing of power parameter is mainly based on rapid optimizing algorithm, for example the gradient descent method.The controllable electric power subelement is connected between main control unit and the adjustable matching network; Mainly utilize power parameter the variable device in the adjustable matching network to be carried out impedance adjustment through main control unit; Thereby make the front and back level Circuit Matching of adjustable matching network, thereby main control unit has reached the purpose of real-time match and regulate through the power at the detection two ends of not stopping.
Fig. 2 is the application sketch map of self adaptation impedance matching module in loaded antenna of the utility model; The self adaptation impedance matching module is between signal reception/transmitting terminal and loaded antenna, and major function is the real-time maintenance coupling of preceding late-class circuit that makes adjustable matching network.
Fig. 3 is the structural representation of adjustable matching network; Comprise adjustable condenser C1, C2, fixed inductor L1, L2; The controllable electric power subelement is regulated adjustable matching network according to the indication of main control unit; The controllable electric power subelement is mainly regulated the biased size of adjustable condenser C1 and C2 two ends in the adjustable matching network, changing the appearance value of adjustable condenser C1 and C2, thereby has changed the match condition of the preceding late-class circuit of adjustable matching network; Concrete capacitance adjustment flow process is determined by main control unit program optimization algorithm; Here specifically can adopt the gradient descent method to carry out, the program optimization algorithm here belongs to the state of the art, is not described in detail at this.
Here, the quantity of adjustable condenser is according to concrete application decision, and the quantity of adjustable condenser has also determined the quantity of controllable electric power in the controllable electric power subelement.
What common adjustable matching network adopted is variable capacitance and inductance π type matching network.π type matching network has comprised all L-C matched form, and the case study on implementation that adjustable matching network shown in Figure 3 is merely the self adaptation impedance matching module is not limited to this, and concrete latticed form can reasonably be selected according to different needs.
Fig. 4 is the first power detector unit that the utility model adopted and the structural representation of the second power detector unit; Concrete monolithic broadband, high-performance logarithm radio-frequency power wave detector LTC5505 and the peripheral circuit thereof that adopts Linear Techn Inc. to release realized, specifically comprises capacitor C 3, C4, coupling resistance R1 and rf power measurement chip LTC5505; The LTC5505 here is with the single-ended radio frequency input service; Do not need the external radio frequency transformer, and volume is little, has therefore simplified design; Reduce cost simultaneously, and helped dwindling the entire area of communication system.
Radiofrequency signal on the transmission line is coupled into rf power measurement chip LTC5505 through coupling capacitance C3 and coupling resistance R1; Main control unit is in running order by power detection chip LTC5505 through the high-low level of the Enable Pin of control rf power measurement chip LTC5505; The result that rf power measurement chip LTC5505 is detected by the output of the 4th pin; Be output as a direct voltage with the linear logarithmic relationship of institute power scale size; The voltage of surveying sends main control unit to and calculates and regulate matching network after processing such as digital-to-analogue conversion and amplification, wherein, capacitor C 4 plays filtering.Here, utilize the rf power measurement chip, thereby do not needed the participation of directional coupler, reduced the volume of module, and also improved the precision that detects.
The controllable electric power subelement here, main control unit knowledge such as (this example can adopt single-chip microcomputer STC89C52) are that those skilled in the art know, and are not described in detail at this.
With the course of work that example is explained the self adaptation impedance matching module of the utility model that is applied as shown in Figure 2:
When communication system is operated in transmit status; Radiofrequency signal is transmitted to loaded antenna through adjustable matching network by signal reception/transmitting terminal; The first power detector unit at first detects the input power size P1 of adjustable matching network front end; And after D/A switch and processing and amplifying, sending testing result to main control unit, because mismatch causes signal not transmit fully, this moment, the second power detector unit detected the power output size P2 of adjustable matching network rear end to signal during through adjustable matching network; And after D/A switch and processing and amplifying, send testing result to main control unit; After accomplishing the processing of two power, main control unit calculates the difference A=P1-P2 of two power, utilizes parameter A to draw the regulation and controlling of information of adjustable matching network 2 based on the program optimization algorithm; Main control unit is according to regulation and controlling of information control controllable electric power subelement, and the controllable electric power subelement is regulated the variable capacitor in the adjustable matching network according to the indication of main control unit.This process constantly repeats, thereby the self adaptation of having accomplished coupling is regulated.Here, detected parameter A can directly be utilized, and unlike other matching scheme such as impedance detection, need just can be used to the subsequent treatment that detected parameter is done further complicacy, thereby improve the regulations speed of module.
To sum up; Can find out; The power parameter of the self adaptation impedance matching module of the utility model through the detected transmission signal carries out real-time match and regulate to the preceding late-class circuit at matching network two ends, promptly utilizes the watt level of the adjustable matching unit of existing rf power measurement chip detection two ends transmission signals; Utilize power parameter to carry out self adaptation and regulate, owing to adopting existing detection chip directly power to be detected thereby having improved accuracy of detection; In the process that detects, do not need the participation of directional coupler, thereby dwindled module area, and can directly utilize the parameter of surveying to regulate, saved follow-up complicated parameter programmed algorithm processing, thereby improved the regulations speed of module.
The above, is equal to and replaces and improvement etc. all any modifications of within the utility model spirit and principle, being done, all should be included within the desired protection range of the utility model.
Claims (3)
1. self adaptation impedance matching module comprises: adjustable matching unit and main control unit, it is characterized in that, and also comprise, the first power detector unit and the second power detector unit, wherein,
The input of described adjustable matching unit is as the input of self adaptation impedance matching module, and the output of said adjustable matching unit is as the output of self adaptation impedance matching module;
The input of the described first power detector unit links to each other with the input of adjustable matching unit;
The output of the described first power detector unit is connected to described main control unit detected first power signal is input to described main control unit;
The input of the described second power detector unit links to each other with the output of adjustable matching unit;
The output of the described second power detector unit is connected to described main control unit detected second power signal is input to described main control unit;
Described main control unit links to each other with adjustable matching unit, regulates adjustable matching unit according to detected first power signal and second power signal.
2. self adaptation impedance matching module according to claim 1; It is characterized in that; Said adjustable matching unit comprises adjustable matching network and controllable electric power subelement, and said main control unit links to each other with the controllable electric power subelement, according to the voltage of detected first power signal and second power signal adjusting controllable electric power subelement; Said controllable electric power subelement links to each other with the adjustable terminal of adjustable matching network, is used to regulate adjustable matching network.
3. self adaptation impedance matching module according to claim 1 and 2 is characterized in that, the described first power detector unit and the second power detector unit are specifically realized through the rf power measurement chip.
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| CN 201220138565 CN202586884U (en) | 2012-04-05 | 2012-04-05 | Adaptive impedance matching module |
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| CN 201220138565 CN202586884U (en) | 2012-04-05 | 2012-04-05 | Adaptive impedance matching module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105103661A (en) * | 2013-03-15 | 2015-11-25 | Mks仪器有限公司 | Virtual rf sensor |
| CN108878240A (en) * | 2017-05-10 | 2018-11-23 | 北京北方华创微电子装备有限公司 | Impedance-matching device and semiconductor processing equipment |
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2012
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105103661A (en) * | 2013-03-15 | 2015-11-25 | Mks仪器有限公司 | Virtual rf sensor |
| CN105103661B (en) * | 2013-03-15 | 2018-01-30 | Mks仪器有限公司 | Virtual RF sensors |
| CN108878240A (en) * | 2017-05-10 | 2018-11-23 | 北京北方华创微电子装备有限公司 | Impedance-matching device and semiconductor processing equipment |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20150405 |
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| EXPY | Termination of patent right or utility model |