CN101335502A - Standing wave ratio debugging method and system of low noise amplifier - Google Patents
Standing wave ratio debugging method and system of low noise amplifier Download PDFInfo
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- CN101335502A CN101335502A CN 200810068338 CN200810068338A CN101335502A CN 101335502 A CN101335502 A CN 101335502A CN 200810068338 CN200810068338 CN 200810068338 CN 200810068338 A CN200810068338 A CN 200810068338A CN 101335502 A CN101335502 A CN 101335502A
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Abstract
The invention is applicable to the electronic information field and provides a method and system for standing-wave ratio debugging of a low noise amplifier; wherein, the method comprises the steps as follows: the reference values of all the component of a peripheral circuit of the low noise amplifier are received; the standing-wave ratio is calculated according to the received reference values and is displayed; the regulating value of a radio-frequency signal grounded capacitor is received; the standing-wave ratio is calculated according to the regulated capacitance value of the ratio-frequency signal grounded capacitor and is displayed. The embodiment of the invention regulates the capacitance value of the ratio-frequency signal grounded capacitor for preventing the best standing-wave ratio from deviating from a best designed range value; as the ratio-frequency signal grounded capacitor basically does not participate in the matching of noise factors, the influence of the appropriately regulated capacitance value of the ratio-frequency signal grounded capacitor on the change of the noise factor is small and can be neglected; therefore, the influence on the noise system caused by regulating the capacitance value of the ratio-frequency signal grounded capacitor does not need to be considered, thus enhancing production efficiency.
Description
Technical field
The invention belongs to electronic information field, relate in particular to a kind of standing wave ratio debugging method of low noise amplifier.
Background technology
Low noise amplifier is the key components of wireless communication system, is mainly used in the radio-frequency front-end of wireless communication system receiver.Standing-wave ratio (Standing Wave Ratio, SWR) be one of the key technical indexes of low noise amplifier, characterized the match condition in its input and output loop, defined standing-wave ratio SWR=R/r=(1+k)/(1-k) usually, wherein R represents the resistance value of output matching network, r represents the resistance value of input matching network, k represents reflection coefficient, under the perfect condition, when input matched impedance R equates with output matched impedance r, reflection coefficient k is 0, does not promptly produce reflection.Usually, input matching network is generally the acquisition minimal noise and is designed near optimum noise matching network rather than best power matching network, and output matching network generally is to design for obtaining maximum power and minimum standing-wave ratio, so, always there is certain mismatch in the input matching network of low noise amplifier, make that the systematic reflection coefficient k is not 0, causes system's instability.
Usually, before low noise amplifier dispatched from the factory, supplier can provide peripheral circuit design scheme and best values such as input matching network impedance, output matching network impedance, with for reference.Show a kind of low noise amplifier that prior art provides and the design of peripheral circuit thereof as Fig. 1.Wherein, the NC pin of The low noise amplifier chip can not connect or ground connection to help the heat release of chip, the RFIN pin is the radiofrequency signal input pin, RFGND is the radiofrequency signal grounding pin, VBAIS is the direct current biasing input pin, FB1 is the feedback signal input pin, and RFOUT is the input pin of radiofrequency signal output pin and direct current, and GND is a grounding pin.Biasing resistor R1 moves back the dc bias circuit that lotus root capacitor C 24 constitutes The low noise amplifier chip with biasing, and it connects the VBIAS pin of described low noise amplifier, and VCC is used to provide bias voltage; Resistance R 2 and capacitor C 25 constitute the feedback loop of The low noise amplifier chip, it connects the FB1 pin of described low noise amplifier, be used for output signal is fed back to low noise amplifier, adjust bias voltage by the low noise amplifier internal circuit then, thereby play the effect of guard amplifier; Input matching capacitance C21, inductance L 21 and radiofrequency signal ground capacity C22 constitute input matching network, wherein, the end of input matching capacitance C21 connects signal input part, the other end connects an end of RFIN pin and inductance L 21, the other end of inductance L 21 connects RF_GND pin and radiofrequency signal ground capacity C22, the other end ground connection of radiofrequency signal ground capacity C22; The output matching network of the RFOUT pin of the described low noise amplifier of connection that output coupling capacitor C23 and low noise amplifier power supply inductance L 22 constitute simultaneously.In the actual application, because batch gender gap and manufacturing firm's difference of discreteness, tolerance and the printed circuit board (PCB) of low noise amplifier peripheral electron components and parts tend to cause its best standing-wave ratio to depart from the optimal design value range.
The value that prior art adopts debugging to change input matching capacitance C21 and inductance L 21 is usually eliminated above-mentioned influence, but changing the value of input matching capacitance C1 and inductance L 1, debugging generally can worsen noise factor, this just need carry out the debugging of repeated multiple times between input vswr and noise factor, have a strong impact on production efficiency.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of standing-wave ratio debud mode of low noise amplifier, be intended to solve a kind of low noise amplifier that prior art provides, when its input coupling of debugging, need between input vswr and noise factor, carry out the debugging of repeated multiple times, influence the problem of production efficiency.
The embodiment of the invention is achieved in that a kind of standing wave ratio debugging method of low noise amplifier, said method comprising the steps of:
Receive the reference value of each components and parts of peripheral circuit of low noise amplifier;
Calculate standing-wave ratio and demonstration according to the described reference value that receives;
The regulated value of received RF signal ground capacity;
Capacitance according to the radiofrequency signal ground capacity after regulating calculates standing-wave ratio and demonstration.
Another purpose of the embodiment of the invention is to provide a kind of standing-wave ratio debug system of low noise amplifier, and described system comprises:
The numerical value receiving element is used to receive the reference value of each components and parts of peripheral circuit of low noise amplifier and the regulated value of radiofrequency signal ground capacity;
Computing unit is used for the reference value of each components and parts of receiving according to described numerical value receiving element and the regulated value of radiofrequency signal ground capacity and calculates standing-wave ratio;
Display unit is used to the standing-wave ratio that shows that described computing unit calculates.
Another purpose of the embodiment of the invention is to provide a kind of analogue system, and described analogue system comprises the standing-wave ratio debug system of a low noise amplifier, and the standing-wave ratio debug system of described low noise amplifier comprises:
The numerical value receiving element is used to receive the reference value of each components and parts of peripheral circuit of low noise amplifier and the regulated value of radiofrequency signal ground capacity;
Computing unit is used for the reference value of each components and parts of receiving according to described numerical value receiving element and the regulated value of radiofrequency signal ground capacity and calculates standing-wave ratio;
Display unit is used to the standing-wave ratio that shows that described computing unit calculates.
The embodiment of the invention is by regulating the capacitance of radiofrequency signal ground capacity C22, to overcome discreteness owing to low noise amplifier peripheral electron components and parts, the best standing-wave ratio that batch gender gap of tolerance and printed circuit board (PCB) and manufacturing firm's difference cause departs from the optimal design value range, because radiofrequency signal ground capacity C22 does not participate in the coupling of noise factor substantially, therefore the capacitance of suitable adjusting radiofrequency signal ground capacity C22 is very little to the change influence of noise factor, can ignore, therefore in the capacitance of regulating radiofrequency signal ground capacity C22, the influence that does not need the consideration meeting that noise factor is caused, thus production efficiency improved.
Description of drawings
Fig. 1 is the low noise amplifier that provides of prior art and the circuit diagram of peripheral circuit thereof;
Fig. 2 is the block diagram of the standing wave ratio debugging method that provides of the embodiment of the invention;
Fig. 3 is the structure chart of the standing-wave ratio debug system that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention is by regulating the capacitance of radiofrequency signal ground capacity C22, because batch gender gap of discreteness, tolerance and the printed circuit board (PCB) of low noise amplifier peripheral electron components and parts and the best standing-wave ratio that manufacturing firm's difference causes depart from the optimal design value range, improved production efficiency to overcome.
Fig. 2 shows the step of the standing wave ratio debugging method that the embodiment of the invention provides.
In step S201, receive the reference value of the peripheral circuit of low noise amplifier as shown in Figure 1.
In step S202, calculate standing-wave ratio and show result of calculation according to the reference value that receives.
In step S203, the regulated value of the capacitance of received RF signal ground capacity.
In embodiments of the present invention, the model that low noise amplifier adopts is MGA-632P8, and its structure and peripheral circuit do not repeat them here as shown in Figure 1.By definition SWR=R/r=(1+k)/(1-k) as can be known, standing-wave ratio SWR value 1 and infinity between, the value of SWR is more little, the loss of output signal is more little, and in actual design process, considers every technical indicator of low noise amplifier, as gain, noise factor, SWR etc., can not meet the demands simultaneously, therefore need the every technical indicator of balance, suitably regulate the reference value of input matched impedance and output matched impedance, so that the SWR value is in the optimal design value range.
As shown in Figure 1, can get the resistance value of input matching network as calculated
When input matching capacitance C21 and inductance L 21 are definite value, as can be known, when radiofrequency signal ground capacity C22 value increases, Z
INIncrease; When radiofrequency signal ground capacity C22 value reduces, Z
INReduce.And SWR=Z
OUT/ Z
IN, in the impedance Z of output matching network
OUTUnder the constant situation, Z
INIncrease, SWR reduces; Z
INReduce, SWR increases, and therefore can make the SWR value in the optimal design value range by suitably regulating the capacitance of radiofrequency signal ground capacity C22.Because radiofrequency signal ground capacity C22 does not participate in the coupling of noise factor substantially, therefore the capacitance of suitable adjusting radiofrequency signal ground capacity C22 is very little to the change influence of noise factor, can ignore.
In step S204, according to the capacitance calculating standing-wave ratio and the demonstration of the radiofrequency signal ground capacity after regulating.
Fig. 3 shows the structure of the standing-wave ratio debug system that the embodiment of the invention provides.
Numerical value receiving element 301 receive the low noise amplifier peripheral circuit that users key in by various input terminals each components and parts reference value and send computing unit 302 to.Computing unit 302 calculates standing-wave ratio according to the reference value of each components and parts that receives, and shows with numerical value or alternate manner by display unit 303.If the standing-wave ratio that display unit 303 shows departs from the optimal design value range, numerical value receiving element 301 receives the regulated value of the radiofrequency signal ground capacity C22 that users key in by various input terminals and sends computing unit 302 to, computing unit 302 calculates standing-wave ratio according to the regulated value of the radiofrequency signal ground capacity C22 that receives, and shows with numerical value or alternate manner by display unit 303.In like manner, if the standing-wave ratio that display unit 303 shows still departs from the optimal design value range, then the regulated value of received RF signal ground capacity C22 again can not limit repeatedly and regulate, its principle as mentioned above, the standing-wave ratio that shows until display unit 303 falls in the optimal design scope.
The standing-wave ratio debug system of the low noise amplifier that the embodiment of the invention provides can be software unit, hardware cell or the software and hardware combining unit that is built in analogue system.
The embodiment of the invention is by regulating the capacitance of radiofrequency signal ground capacity, to overcome discreteness owing to low noise amplifier peripheral electron components and parts, the best standing-wave ratio that batch gender gap of tolerance and printed circuit board (PCB) and manufacturing firm's difference cause departs from the optimal design value range, because the radiofrequency signal ground capacity does not participate in the coupling of noise factor substantially, therefore the capacitance of suitable adjusting radiofrequency signal ground capacity is very little to the change influence of noise factor, can ignore, therefore in the capacitance of regulating the radiofrequency signal ground capacity, the influence that does not need the consideration meeting that noise factor is caused, thus production efficiency improved.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is can control relevant hardware by program to finish, described program can be in being stored in a computer read/write memory medium, described storage medium is as ROM/RAM, disk, CD etc.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1, a kind of standing wave ratio debugging method of low noise amplifier is characterized in that, said method comprising the steps of:
Receive the reference value of each components and parts of peripheral circuit of low noise amplifier;
Calculate standing-wave ratio and demonstration according to the described reference value that receives;
The regulated value of received RF signal ground capacity;
Capacitance according to the radiofrequency signal ground capacity after regulating calculates standing-wave ratio and demonstration.
2, the method for claim 1 is characterized in that, the model of described low noise amplifier is MGA-632P8, and the peripheral circuit of described low noise amplifier comprises:
Constitute input matching network by input matching capacitance, inductance and radiofrequency signal ground capacity, wherein, one end of described input matching capacitance connects signal input part, the other end connects a RFIN pin in the described low noise amplifier and an end of described inductance, the other end of described inductance connects RF GND pin and the described radiofrequency signal ground capacity in the described low noise amplifier, the other end ground connection of described radiofrequency signal ground capacity; And
The output matching network that connects the RFOUT pin of described low noise amplifier.
3, method as claimed in claim 2, it is characterized in that the peripheral circuit of described low noise amplifier further comprises the dc bias circuit of the VBIAS pin that connects described low noise amplifier and the feedback loop of the FB1 pin that is connected described low noise amplifier.
4, a kind of standing-wave ratio debug system of low noise amplifier is characterized in that, described system comprises:
The numerical value receiving element is used to receive the reference value of each components and parts of peripheral circuit of low noise amplifier and the regulated value of radiofrequency signal ground capacity;
Computing unit is used for the reference value of each components and parts of receiving according to described numerical value receiving element and the regulated value of radiofrequency signal ground capacity and calculates standing-wave ratio;
Display unit is used to the standing-wave ratio that shows that described computing unit calculates.
5, system as claimed in claim 4 is characterized in that, the model of described low noise amplifier is MGA-632P8, and described peripheral circuit comprises:
Constitute input matching network by input matching capacitance, inductance and radiofrequency signal ground capacity, wherein, one end of described input matching capacitance connects signal input part, the other end connects a RFIN pin in the described low noise amplifier and an end of described inductance, the other end of described inductance connects RF GND pin and the described radiofrequency signal ground capacity in the described low noise amplifier, the other end ground connection of described radiofrequency signal ground capacity; And
The output matching network that connects the RFOUT pin of described low noise amplifier.
6, system as claimed in claim 5 is characterized in that, described peripheral circuit further comprises the dc bias circuit of the VBIAS pin that connects described low noise amplifier and the feedback loop of the FB1 pin that is connected described low noise amplifier.
7, a kind of analogue system is characterized in that, described analogue system comprises the standing-wave ratio debug system of a low noise amplifier, and the standing-wave ratio debug system of described low noise amplifier comprises:
The numerical value receiving element is used to receive the reference value of each components and parts of peripheral circuit of low noise amplifier and the regulated value of radiofrequency signal ground capacity;
Computing unit is used for the reference value of each components and parts of receiving according to described numerical value receiving element and the regulated value of radiofrequency signal ground capacity and calculates standing-wave ratio;
Display unit is used to the standing-wave ratio that shows that described computing unit calculates.
8, analogue system as claimed in claim 7 is characterized in that, the model of described low noise amplifier is MGA-632P8, and described peripheral circuit comprises:
Constitute input matching network by input matching capacitance, inductance and radiofrequency signal ground capacity, wherein, one end of described input matching capacitance connects signal input part, the other end connects a RFIN pin in the described low noise amplifier and an end of described inductance, the other end of described inductance connects RF GND pin and the described radiofrequency signal ground capacity in the described low noise amplifier, the other end ground connection of described radiofrequency signal ground capacity; And
The output matching network that connects the RFOUT pin of described low noise amplifier.
9, analogue system as claimed in claim 8 is characterized in that, described peripheral circuit further comprises the dc bias circuit of the VBIAS pin that connects described low noise amplifier and the feedback loop of the FB1 pin that is connected described low noise amplifier.
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| CN 200810068338 CN100594670C (en) | 2008-07-07 | 2008-07-07 | Standing wave ratio debugging method and system of low noise amplifier |
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| CN 200810068338 CN100594670C (en) | 2008-07-07 | 2008-07-07 | Standing wave ratio debugging method and system of low noise amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994959A (en) * | 2016-10-26 | 2018-05-04 | 普天信息技术有限公司 | The detection method and device of remote radio unit (RRU) RRU standing-wave ratios |
| CN112737705A (en) * | 2020-12-29 | 2021-04-30 | 京信网络系统股份有限公司 | Automatic electronic tuning device and automatic electronic tuning method for standing-wave ratio |
-
2008
- 2008-07-07 CN CN 200810068338 patent/CN100594670C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994959A (en) * | 2016-10-26 | 2018-05-04 | 普天信息技术有限公司 | The detection method and device of remote radio unit (RRU) RRU standing-wave ratios |
| CN112737705A (en) * | 2020-12-29 | 2021-04-30 | 京信网络系统股份有限公司 | Automatic electronic tuning device and automatic electronic tuning method for standing-wave ratio |
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| CN100594670C (en) | 2010-03-17 |
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Assignee: MOBI Technologies (Xi'an) Co., Ltd. Assignor: Mobile Antenna Technologies (Shenzhen) Co., Ltd. Contract record no.: 2012440020135 Denomination of invention: Standing wave ratio debugging method and system of low noise amplifier Granted publication date: 20100317 License type: Exclusive License Open date: 20081231 Record date: 20120601 |
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Granted publication date: 20100317 Termination date: 20170707 |