CN1697434A - Automatic gain control method and device in WLAN system - Google Patents
Automatic gain control method and device in WLAN system Download PDFInfo
- Publication number
- CN1697434A CN1697434A CN 200510073817 CN200510073817A CN1697434A CN 1697434 A CN1697434 A CN 1697434A CN 200510073817 CN200510073817 CN 200510073817 CN 200510073817 A CN200510073817 A CN 200510073817A CN 1697434 A CN1697434 A CN 1697434A
- Authority
- CN
- China
- Prior art keywords
- gain
- power level
- amplifier
- power
- gain control
- 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.)
- Granted
Links
Images
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Power of detected signal is examines first to determine whether the power is large enough to require to startup up AGC procedure. Average power of the detected signal is calculated, and compared with first threshold value in order to determine whether coarse adjustment is continued, or procedure of fine adjustment is to be entered. Gain value of low noise amplifier (LNA) and gain value of variable gain amplifier (VGA) are adjusted in phase of coarse adjustment. Only gain value of VGA is adjusted in phase of fine adjustment. In phase of coarse adjustment, gain value of LNA and VGA are adjusted according to default value. In phase of fine adjustment, gain value of VGA is adjusted according to difference between calculated average power and second threshold value.
Description
Technical field
The present invention is relevant for automatic gain control (Automatic Gain Control; AGC), particularly a kind of relevant WLAN (Wireless Local Area Network that is applicable to; WLNA) AGC method.
Background technology
Automatic gain control (Automatic Gain Control; AGC) method is a kind of special parameter that utilizes, and received signal level is for example adjusted the process of gain automatically with ad hoc fashion.Gain is defined as, from the amplitude that the signal of telecommunication increases between the output after the amplification that is input to originally.Narrated two kinds of AGC algorithm examples that are used in usually in the wireless communication receiver below, comprised that binary tree (binary tree) is searched and calculate according to RSSI.
Fig. 1 has described a kind of binary tree method for searching.Circuit is carried out low noise amplifier (low noise amplifier with binary mode; LNA) and variable gain amplifier (variable gainamplifier; VGA), set, be used for looking for the needed best input value of modulus when separating frequency modulation (A/D) transducer to judge final gain fast.LNA is used in the value of adjusting coarse adjustment gain (coarse gain), and VGA is used in the value of adjusting fine setting gain (fine gain).Whether binary tree search AGC algorithm detects saturated (saturation) according to A/D converter is fully controlled.A/D converter saturated is whether to reach a default maximum or minimum value is judged according to numeric word (digital word).The circuit of realizing binary tree search AGC algorithm at first is made as default maximum gain situation with VGA and LNA value.When determining A/D when saturated, the circuit utilization is adjusted the VGA value gain is reduced to a default median.The selection of median allows circuit can judge that the LNA value can correctly set.If electric circuit inspection is to saturated at this moment, circuit is with radio frequency (radio frequency; RF) front end is set at low gain mode, and begins to utilize the binary number mode to search correct VGA setting.Ifs circuit does not detect saturated at this moment, and circuit is stayed high gain mode with LNA, and begins to utilize binary system to search the VGA value.Can represent by the AGC decision structure of Fig. 2 with binary tree narration AGC algorithm like this.The very important point is to have determined the LNA setting when circuit, and this LNA is set in a package and keeps in the delivery time always, can not become up to the preceding of next package.As shown in Figure 2, binary tree search the AGC algorithm each section period via a kind of yield value of adjusting of selecting among two kinds of possible paths.In order to obtain acceptable gain accuracy, needed convergence time is quite long.
Fig. 3 is for describing the flow chart according to the AGC algorithm of RSSI value.Received signal strength indicator (received signal strength indicator; RSSI) voltage can be used for quickening to adjust the reference data of gain.By the detected signal of RSSI block is that output from fundamental frequency analog I low pass channel filter obtains.The RSSI output valve is directly to be decided by the gain setting of RF end.But the gain setting of fundamental frequency AGC does not but influence RSSI output, and this is because the input signal of RSSI block just obtained before fundamental frequency AGC block.Because yield value according to the AGC algorithm adjustment that RSSI realized, can be controlled completely in the simulation fundamental frequency district of receiver, so do not need the transducer of modulus, but the AGC algorithm of realizing according to RSSI but only is applicable to the receiver that comprises the RSSI function at the fundamental frequency end.And the IC of not all RF provides manufacturer to provide RSSI function for the fundamental frequency transmission.
Summary of the invention
In order to reach the time that shortens automatic gain control (AGC) convergence, the invention provides the method for a kind of AGC, be applicable to by on the defined WLAN of IEEE 802.11a/b/g (WLNA).Because the short preamble (short preamble) of IEEE802.11a/b/g is shorter, the AGC algorithm can be restrained yield value at short notice.The AGC algorithm is judged the received signal intensity of analog to digital converter (ADC) via adjusting Amplifier Gain.
Another object of the present invention is for providing a kind of agc circuit, do not need with reference to the information of RSSI ride gain value automatically just.
One embodiment of the present of invention provide a kind of AGC method, under the assistance that does not need RSSI, adjust the gain of low noise amplifier (LNA) and variable gain amplifier (VGA).The embodiment of AGC method can approximately be divided into trace routine, coarse adjustment program and fine setting program.LNA gain and VGA gain just are initialised according to default high threshold LNA0 and VGA0 respectively before trace routine.In trace routine, the detection that the power of a signal is continued, and with first power level relatively, till the signal power that detects surpasses first power level.Wherein first power level must be greater than average noise power.Next begin to carry out the coarse adjustment program, adjust the LNA gain and gain to maximum default value LNA1 and VGA1 with VGA.Calculate second power level according to the average power of detection signal, to judge whether to finish the coarse adjustment program.When second power level exceeds first threshold, just continue to carry out the coarse adjustment program, otherwise just can begin to carry out fine setting program in the AGC method.When if second power level surpasses first threshold, LNA and VGA gain are adjusted according to middle default value LNA2 and LGA2, and recomputate second power level.Second power level and the first threshold that recomputate compare once more, similarly, if second power level of reruning still is higher than first threshold, the furnishing smallest default that just will gain value LNA3 and VGA3, otherwise enter the fine setting program.In the fine setting program, the LNA gain no longer is adjusted.After beginning the fine setting program, calculate the 3rd power level according to the average power of detection signal.So the VGA gain is adjusted according to a difference of the 3rd power level and second threshold value.
Embodiments of the invention provide a kind of AGC design of fully digitalization, and without any need for the feedback of radio frequency (RF), and are applicable on various types of RF integrated circuits (IC) that different vendor provides.In one embodiment, the adjustment of LNA gain be from the value of maximum be transferred to minimum value (LNA0＞=LNA1＞=LNA2＞=LNA3), this be because the time of amplifier discharge (discharge) usually than the time weak point of charging.
Description of drawings
For above and other objects of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail as follows.
Fig. 1 represents the flow chart of the AGC method of binary tree search traditionally.
Fig. 2 represents the structure chart of AGC decision-making technique traditionally.
Fig. 3 describes traditionally the flow chart of the AGC method that realizes according to RSSI.
Fig. 4 a-4b is the flow chart of the AGC method of the description embodiment of the invention.
Fig. 5 is the calcspar of the AGC device of the embodiment of the invention.
Symbol description
The 502-LNA/VGA amplifier;
504-analog to digital converter (ADC);
The 506-power calculation unit;
The 509-noise floor;
508-first power calculation unit;
510-detects logic;
The 511-AGC enabling signal;
512-second power calculation unit;
513-first threshold (TH1);
514-coarse adjustment gain judging unit;
516-the 3rd power calculation unit;
517-second threshold value (TH2);
518-fine setting gain judging unit;
The 519-fine adjustment signal;
The 520-LNA gain controller;
The 522-VGA gain controller;
The 524-adder
Embodiment
Fig. 4 a-4b describes the step of the AGC method of the embodiment of the invention.G_RF represents the yield value of radio frequency, be also referred to as the gain of low noise frequency amplifier (LNA) simultaneously, and G_BB represents the yield value of fundamental frequency, is also referred to as the gain of variable gain amplifier (VGA) simultaneously.These two yield value G_RF and G_BB are set to high threshold LNA0 and VGA0 in step 402.In the step 404, the power of detection signal and the first power level avg_power1 compare, wherein, the algorithm of detection power is real part (realcomponent) and imaginary part (imaginary component) square sum total, and ideal power mean value that surpasses average noise power of avg_power1.In one embodiment of the present of invention, avg_power1 is the average power of 16 point sampling samples again.The comparative result of step 404 is if detection signal power during greater than average power, and the power of expression detection signal is enough big, just can carry out the coarse adjustment program by initial AGC.
The coarse adjustment program comprises step 406 to 424, and shown in step 406, yield value G_RF and G_BB are transferred to maximum default value LNA1 and VGA1 respectively.When changing gain, system needs one section gain modulation time GS_TimeX (step 408,416,424,430 and 436).The time value of GS_Time0-GS_Time4 is difference along with different RF chips, and for example all gain modulation times of Maxim RF all are to approximate 0.4 μ s greatly.Next, average power avg_power2 is calculated in step 410, and via comparing with first threshold TH1, the comparative result that obtains is used to judge whether to proceed the coarse adjustment program, or enters the fine setting program.In one embodiment, avg_power2 is the average power of 16 point sampling samples.Step 410 needs cost a period of time time ACC_Time that add up, and is used for judging the avg_power2 of yield value with calculating.When avg_power2 is the average power of 16 point sampling samples, and when system sequence was 40MHz, ACC_Time1 approximated 0.4 μ s greatly.First threshold TH1 is that the ideal power according to 16 point sampling samples adds a gain increment, and 16 for example desirable sample power be-7dB, and the increment that gains is 15dB, then allow TH1 be 8dB (7dB+15dB).The gain increment is with the amplitude that decides fine setting VGA, and when power during less than TH1, the gain that representative is adjusted is enough in target gain value, and also representative can begin to carry out the program of fine setting.
If avg_power2 less than equaling TH1, then represents present gain near target gain in step 412, the AGC program stops the coarse adjustment program, and the fine setting program of beginning execution in step 426 to 436.Otherwise step 414 is adjusted to middle default value LNA2 and VGA2 respectively with gain G _ RF and G_BB.Avg_power2 is reruned in step 418, and compares with TH1 in step 420, in the same manner, if the avg_power2 that obtains from step 418 during smaller or equal to the TH1 of step 420, just finishes the coarse adjustment program.When the avg_power2 that reruns still surpasses TH1, in step 422, respectively gain G _ RF and G_BB are adjusted to smallest default value LNA3 and VGA3.
In the program of fine setting, step 426 is calculated the 3rd average power avg_power3 earlier, and Hua Fei time is ACC_Time2 altogether.In one embodiment of the present of invention, avg_opwer3 is the average power of 32 samples again, so ACC_Time2 is identified as the twice of ACC_Time1 time, i.e. 0.8 μ s.After obtaining avg_power3, calculate the difference dG1 between the second threshold value TH2 and the avg_power3 in the step 428.Again in one embodiment of the present of invention, the second threshold value TH2 calculates for rate according to the ideal of 32 samples, and if TH1 be the ideal power of 16 samples, than the high 3dB of value of TH1.The difference dG1 representative that step 428 is calculated increases the value G_BB (is unit with dB) of VGA gain.
Avg_power3 is calculated in step 432 once more, and avg_power3 is according to the gap dG2 between TH2 and the avg_power3 that reruns out, and the AGC method of the yield value of fine setting VGA is finished after twice of fine setting VGA gain, so just begin follow-up fundamental frequency program.
One embodiment of the present of invention provide an AGC system as Fig. 5.The RF signal receives and is calculated by power calculation unit the power of signal from LNA/VGA amplifier 502 and analog to digital converter (ADC) 506.First power calculation unit 508 is calculated 16 desirable mean values at received power, and exports the first power level avg_power1 to detecting logical block 510.First power level must surpass an average noise power, i.e. noise floor (noise floor) 509.Detect the detection power that logic 510 is calculated power calculation unit 506, the avg_power1 that calculates with first power calculation unit 508 compares, and when the power that detects surpasses avg_power1, output AGC enabling signal 511.AGC enabling signal 511 allows the AGC program begin to carry out coarse adjustment.Second power calculation unit 512 is calculated 16 average power avg_power2, and exports coarse adjustment gain judging unit 514 to.Coarse adjustment gain judging unit 514 compares avg_power2 and first threshold TH1 513, if avg_power2 surpasses TH1 513, just triggering LNA gain controller 520 is VGA gain controller 522, adjusts the gain of amplifier 502 via output coarse adjustment signal 515.Utilize and repeat twice such coarse adjustment program, just can reach the purpose of dwindling gain.When avg_power2 was less than or equal to TH1 313, the 3rd power calculation unit 516 was calculated the average power avg_power3 of 32 samples, and exported avg_power3 to fine setting judging unit 518.Fine setting gain judging unit 518 deducts avg_power3 with second threshold value 517, to obtain a fine adjustment signal 519.Fine adjustment signal 519 more can add fine adjustment signal 519 with the output of VGA gain controller 522 via adder 524, to adjust the VGA yield value.
Though the present invention with preferred embodiment openly as above; right its is not that any those skilled in the art are under the situation that does not break away from the spirit and scope of the present invention in order to qualification the present invention; can change and modification, so protection scope of the present invention is as the criterion with the claim institute restricted portion that is proposed.
Claims (32)
1. auto gain control method comprises:
According to default high threshold (LNA0 and VGA0), set the gain of a low noise amplifier and the gain of a variable gain amplifier respectively;
Detect a signal power, and this signal power and one first power level are compared, up to surpassing this first power level, wherein this first power level is greater than an average noise power;
The gain of this low noise amplifier and variable gain amplifier is adjusted according to maximum default value (LNA1 and VGA1);
Average signal power according to this signal calculates one second power level;
This second power level and a first threshold are compared,, begin to carry out the fine setting program if this second power level is less than or equal to this first threshold;
When if this second power level surpasses this first threshold, this low noise amplifier and variable gain amplifier gain are adjusted according to middle default value (LNA2 and LGA2);
This second power level of reruning also compares with this first threshold, when second power level is less than or equal to this first threshold if this is reruned, carries out the fine setting program;
Second power level surpasses this first threshold if this is reruned, and adjusts the gain of this low noise amplifier and variable gain amplifier according to smallest default value (LNA3 and VGA3);
Begin the fine setting program, calculate one the 3rd power level according to an average power of this signal; And
Adjust the gain of this variable gain amplifier according to a difference of the 3rd power level and one second threshold value.
2. auto gain control method as claimed in claim 1, wherein 16 average powers of ideal of prejudging for this system of this first power level.
3. auto gain control method as claimed in claim 1, wherein this automatic gain control program is finished by numerical calculation.
4. auto gain control method as claimed in claim 3, wherein the gain of this second power level, the 3rd power level, this first threshold, this second threshold value and this low noise amplifier and this variable gain amplifier is all represented by log unit decibel (dB).
5. auto gain control method as claimed in claim 1, wherein this second power level gets according to 16 average powers calculating this signal.
6. auto gain control method as claimed in claim 5, wherein the judgement of this first threshold is the ideal power level according to a gain feasible value and 16 point sampling values.
7. auto gain control method as claimed in claim 1, wherein the 3rd power level gets according to 32 average powers calculating this signal.
8. auto gain control method as claimed in claim 7, wherein this second threshold value is judged by the ideal power level of 32 point sampling values.
9. auto gain control method as claimed in claim 1, wherein the default high threshold (LNA0) of this low noise amplifier gain is more than or equal to the maximum default value (LNA1) of this LNA value, and this centre default value (LNA2) that this LNA1 gains more than or equal to this low noise amplifier, and this LNA2 is more than or equal to the smallest default value (LNA3) of this low noise amplifier gain.
10. auto gain control method as claimed in claim 1 more comprises the 3rd power level of reruning, and this variable gain amplifier gain is adjusted again according to this difference of reruning between the 3rd power level and this second threshold value.
11. automatic gain control (AGC) system comprises:
One detects logic, detect the power of a signal and comparing of inciting somebody to action with one first power level, and when this detection power surpasses this first power level, export automatic gain control enabling signal, wherein this first power level surpasses an average noise power;
One low noise amplifier gain controller, with low noise amplifier gain according to default high threshold (LNA0) initialization, if this detection logic is exported this automatic gain control enabling signal, a maximum default value (LNA1) is adjusted in this low noise amplifier gain, and in after when receiving a coarse adjustment signal, in regular turn this low noise amplifier gain is adjusted into one in the middle of a default value (LNA2) and a smallest default value (LNA3);
One variable gain amplifier gain controller, with variable gain amplifier gain according to default high threshold (VGA0) initialization, if this detection logic is exported this automatic gain control enabling signal, a maximum default value (VGA1) is adjusted in this variable gain amplifier gain, and in after when receiving a coarse adjustment signal, a default value (VGA2) and a smallest default value (VGA3) in the middle of in regular turn this variable gain amplifier gain being adjusted into one, and more adjust this variable gain amplifier gain according to a fine adjustment signal;
One second power calculation unit is calculated one second power level according to an average power of this signal;
One coarse adjustment decision package, this second power level and a first threshold are compared, if this second power level surpasses this first threshold, indicate this low noise amplifier and variable gain amplifier gain controller that this gain is adjusted to LNA2 and VGA2 respectively via transmitting this coarse adjustment signal, and ask this second power calculation unit to recomputate this second power level, second power level and this first threshold of then this being reruned relatively, when second power level surpasses this first threshold if this is reruned, indicate this low noise amplifier and variable gain amplifier gain controller that this gain is adjusted to LNA3 and VGA3 respectively via transmitting this coarse adjustment signal;
One the 3rd power calculation unit, one calculates one the 3rd power level according to an average power of this signal;
One fine setting gain decision package, according to the difference between the 3rd power level and one second threshold value, promptly this fine adjustment signal indicates this variable gain amplifier gain controller that this variable gain amplifier gain is adjusted.
12. AGC (automatic gain control) system as claimed in claim 11 more comprises one first power calculation unit, calculates this first power level according to desirable 16 average powers.
13. AGC (automatic gain control) system as claimed in claim 11, wherein this automatic gain control equipment is a Digital Implementation.
14. AGC (automatic gain control) system as claimed in claim 13, wherein this second power level, the 3rd power level, this first threshold, this second threshold value, this low noise amplifier and the gain of this variable gain amplifier are all represented by log unit decibel (dB).
15. AGC (automatic gain control) system as claimed in claim 11, wherein this second power calculation unit obtains this second power level via one 16 average powers calculating this signal.
16. AGC (automatic gain control) system as claimed in claim 15, wherein the judgement of this first threshold is the ideal power level according to a gain feasible value and 16 point sampling values.
17. AGC (automatic gain control) system as claimed in claim 11, wherein the 3rd power calculation unit obtains the 3rd power level according to 32 average powers calculating this signal.
18. AGC (automatic gain control) system as claimed in claim 17, wherein this second threshold value is judged by the ideal power level of 32 point sampling values.
19. AGC (automatic gain control) system as claimed in claim 11, wherein the default high threshold (LNA0) of this low noise amplifier gain is more than or equal to the maximum default value (LNA1) of this LNA value, and this centre default value (LNA2) that this LNA1 gains more than or equal to this low noise amplifier, and this LNA2 is more than or equal to the smallest default value (LNA3) of this low noise amplifier gain.
20. AGC (automatic gain control) system as claimed in claim 11, wherein this fine setting gain decision package is indicated the 3rd power calculation unit the 3rd power level of reruning, and this variable gain amplifier gain is adjusted again according to this difference of reruning between the 3rd power level and this second threshold value.
21. auto gain control method, be used for controlling a wireless receiver that comprises that a low noise amplifier gain and a variable gain amplifier gain, this auto gain control method is used for judging the final gain setting LNAFinal and the VGAFinal of low noise amplifier and variable gain amplifier gain, and this auto gain control method comprises:
(i) setting this low noise amplifier is the initial value of a corresponding maximum gain with this variable gain amplifier;
(ii) detect and judge whether that one receives the power of RF signal in an effective range of receiving;
If (iii) should receive the power of RF signal not in this effective range of receiving, according to the gain of next this low noise amplifier of default value coarse adjustment and this variable gain amplifier; Wherein Zeng Yi plural default value put in order descendingly for numerical value, therefore next default value is littler than a last default value;
If the power that (iv) should receive the RF signal still beyond this effective reception value, repeating step (ii) with (iii), otherwise low noise amplifier that will be present gains and is fixed as LNAFinal;
(v) calculate an average power of this reception RF signal;
(vi) according to the difference between this average power and the threshold value, the gain of finely tuning this variable gain amplifier becomes VGAFinal.
22. auto gain control method as claimed in claim 21, wherein desirable 16 average powers of judging according to this system of this effective range of receiving set.
23. auto gain control method as claimed in claim 21, wherein this automatic gain control program is carried out by digital operation.
24. auto gain control method as claimed in claim 21, wherein this average power level is resulting by one 32 average powers calculating this signal.
25. auto gain control method as claimed in claim 24, wherein this threshold value is to judge according to an ideal power level of 32 point sampling values.
26. auto gain control method as claimed in claim 21 more comprises and (vii) recomputates this average power level, and adjust this variable gain amplifier gain according to this difference of reruning between average power level and this threshold value.
27. automatic gain control equipment, be used for controlling a wireless receiver that comprises that a low noise amplifier gain and a variable gain amplifier gain, this automatic gain control equipment is judged the final gain setting LNAFinal and the VGAFinal of low noise amplifier and variable gain amplifier gain, comprising:
One setting device, setting this low noise amplifier is the initial value of a corresponding maximum gain with this variable gain amplifier;
One detects and judgment means, detects and judges whether that one receives the power of RF signal in an effective range of receiving;
One rack and rinion adjustment was if should receive the power of RF signal not in this effective range of receiving, according to the gain of next this low noise amplifier of default value coarse adjustment and this variable gain amplifier; Wherein Zeng Yi plural default value put in order descendingly for numerical value, therefore next default value is littler than a last default value;
One calculation element calculates an average power of this reception RF signal;
One micromatic setting, according to the difference between this average power and the threshold value, the gain of finely tuning this variable gain amplifier becomes VGAFinal;
If still beyond this effective reception value, this detects with this rack and rinion adjustment of judgment means request and adjusts low noise amplifier and variable gain amplifier the power that wherein should receive the RF signal, otherwise the gain of present low noise amplifier is fixed as LNAFinal.
28. automatic gain control equipment as claimed in claim 27, wherein desirable 16 average powers of judging according to this system of this effective range of receiving set.
29. automatic gain control equipment as claimed in claim 27, wherein this automatic gain control equipment is carried out with digital operation.
30. automatic gain control equipment as claimed in claim 27, wherein this average power level is resulting by one 32 average powers calculating this signal.
31. automatic gain control equipment as claimed in claim 30, wherein this threshold value is to judge according to an ideal power level of 32 point sampling values.
32. automatic gain control equipment as claimed in claim 27 more comprises and recomputates device, recomputates this average power level, and adjusts this variable gain amplifier gain according to this difference of reruning between average power level and this threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100738172A CN100531170C (en) | 2005-05-24 | 2005-05-24 | Automatic gain control method and device in WLAN system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100738172A CN100531170C (en) | 2005-05-24 | 2005-05-24 | Automatic gain control method and device in WLAN system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1697434A true CN1697434A (en) | 2005-11-16 |
| CN100531170C CN100531170C (en) | 2009-08-19 |
Family
ID=35349961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100738172A Active CN100531170C (en) | 2005-05-24 | 2005-05-24 | Automatic gain control method and device in WLAN system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100531170C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359942B (en) * | 2008-09-18 | 2010-12-22 | 北京创毅视讯科技有限公司 | Power control module and method, transceiving apparatus comprising power control module |
| CN110995302A (en) * | 2019-11-20 | 2020-04-10 | 维沃移动通信有限公司 | Gain stage adjusting method and electronic equipment |
| CN113037433A (en) * | 2020-03-02 | 2021-06-25 | 加特兰微电子科技(上海)有限公司 | Automatic gain control method, sensor and radio device |
| CN114945210A (en) * | 2022-05-06 | 2022-08-26 | 广州芯之联科技有限公司 | Radio frequency signal gain control method, system, device and medium |
-
2005
- 2005-05-24 CN CNB2005100738172A patent/CN100531170C/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359942B (en) * | 2008-09-18 | 2010-12-22 | 北京创毅视讯科技有限公司 | Power control module and method, transceiving apparatus comprising power control module |
| CN110995302A (en) * | 2019-11-20 | 2020-04-10 | 维沃移动通信有限公司 | Gain stage adjusting method and electronic equipment |
| CN110995302B (en) * | 2019-11-20 | 2021-07-06 | 维沃移动通信有限公司 | Gain stage adjusting method and electronic equipment |
| CN113037433A (en) * | 2020-03-02 | 2021-06-25 | 加特兰微电子科技(上海)有限公司 | Automatic gain control method, sensor and radio device |
| CN113037433B (en) * | 2020-03-02 | 2023-03-31 | 加特兰微电子科技(上海)有限公司 | Automatic gain control method, sensor and radio device |
| CN114945210A (en) * | 2022-05-06 | 2022-08-26 | 广州芯之联科技有限公司 | Radio frequency signal gain control method, system, device and medium |
| CN114945210B (en) * | 2022-05-06 | 2024-02-09 | 广州芯之联科技有限公司 | Radio frequency signal gain control method, system, device and medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100531170C (en) | 2009-08-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6311048B1 (en) | Intelligent control of receiver linearity based on interference | |
| US7088794B2 (en) | Automatic gain control for digitized RF signal processing | |
| US6473016B2 (en) | Method and apparatus for implementing automatic gain control in a system | |
| CN1396721A (en) | Method and device for raising noise immunity of receiver | |
| CN102820898B (en) | Gain regulation method and equipment | |
| US7187915B2 (en) | Automatic gain control for a WLAN system | |
| CN111478710B (en) | Method and system for suppressing adjacent channel interference, receiver and communication system | |
| JP2003060539A (en) | Antenna switching device | |
| KR101790960B1 (en) | Bluetooth smart signal receiving method and device using improved automatic gain control | |
| US8909183B2 (en) | Automatic gain control device | |
| CN1697434A (en) | Automatic gain control method and device in WLAN system | |
| CN1759535A (en) | Automatic gain control with two power detectors | |
| US20040259510A1 (en) | Telecommunications receiver with automatic gain control | |
| CN102055489B (en) | Channel searching device and method for broadcasting receiver | |
| CN113992171B (en) | Receiver and automatic gain control method thereof | |
| US20090318133A1 (en) | Error detector, error detecting method and control program thereof | |
| CN100352171C (en) | Apparatus and method for enhancing a reception rate of a receiver with AGC | |
| US20030006839A1 (en) | Extended range power detector and amplifier and method | |
| US20050201497A1 (en) | Automatic gain control and its controlling method | |
| US20040171365A1 (en) | Off-channel signal detector with programmable hysteresis | |
| US20070047670A1 (en) | High-frequency detection mechanism and automatic gain control system utilizing the same | |
| CN102264120A (en) | Terminal and method for searching cell frequency point | |
| CN114499561A (en) | Wireless communication receiver and automatic gain control device and control method thereof | |
| CN116017666A (en) | AGC (automatic gain control) implementation method, device and system based on multi-stage output signal strength detection | |
| KR100690438B1 (en) | Method and apparatus for automatic gain control with variable control intervals |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |