CN201323578Y - Wireless local area network two-way amplifier with downlink automatic level control - Google Patents
Wireless local area network two-way amplifier with downlink automatic level control Download PDFInfo
- Publication number
- CN201323578Y CN201323578Y CNU2008201462281U CN200820146228U CN201323578Y CN 201323578 Y CN201323578 Y CN 201323578Y CN U2008201462281 U CNU2008201462281 U CN U2008201462281U CN 200820146228 U CN200820146228 U CN 200820146228U CN 201323578 Y CN201323578 Y CN 201323578Y
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- circuit
- local area
- wireless local
- amplifier
- area network
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Abstract
The utility model relates to a wireless local area network two-way amplifier with downlink automatic level control. The wireless local area network two-way amplifier comprises an uplink low-noise discharge circuit, a downlink power amplifier circuit, a radio frequency switch, a coupler, an envelope detection synchronous signal processing circuit, a switch control circuit and a power supply control circuit, a network card and an antenna, and is characterized in that an attenuator (ATT) circuit is connected between the radio frequency switch and the downlink power amplifier circuit, a microprocessor is arranged inside the envelope detection two-way amplifier of a wireless local area network with high directional property, the input terminal of the microprocessor is connected with a power reference value, one output of the downlink power amplifier circuit is connected with the microprocessor through an output power detection circuit, and the output of the microprocessor is connected with the control terminal of the attenuator (ATT) circuit. The wireless local area network two-way amplifier solves the problem of unstable maximum output power of the amplifier caused by different output powers of the network card, has wide versatility, and is not limited by the network cards provided by different network card manufacturers.
Description
Technical field:
The utility model is applicable to wireless communication system, has the WLAN (wireless local area network) two-way amplifier of descending automatic electric-level control in particularly a kind of wireless communication system.
Background technology:
Existing WLAN (wireless local area network) two-way amplifier generally is that producer determines the gain that the WLAN (wireless local area network) two-way amplifier is descending according to own employed network interface card, with the peak power output that realizes marking, such WLAN (wireless local area network) two-way amplifier versatility is relatively poor, and also can cause the variation of WLAN (wireless local area network) two-way amplifier peak power output in the actual use because of the variation of the power output of network interface card, thereby cause the signal quality variation, influence the effect of the former area of coverage.The theory diagram of existing WLAN (wireless local area network) two-way amplifier as shown in Figure 1.
Summary of the invention:
The purpose of this utility model is to provide a kind of WLAN (wireless local area network) two-way amplifier with descending automatic electric-level control, and this amplifier highly versatile is not subjected to the restriction of the network interface card of different network interface card manufacturer production.
Goal of the invention of the present utility model realizes by following technical scheme:
The utlity model has the WLAN (wireless local area network) two-way amplifier of descending automatic electric-level control, comprise up LNA circuit, descending power amplifier, radio-frequency (RF) switch, coupler, the envelope detection synchronization signal processing circuit, ON-OFF control circuit and power control circuit, and network interface card and antenna, it is characterized in that: between radio-frequency (RF) switch and descending power amplifier, be connected with the ATT attenuator circuit, be provided with microprocessor in the envelope detection two-way amplifier of described WLAN (wireless local area network) with high directivity, the input of this microprocessor is connected with the power reference reference value, one tunnel output of descending power amplifier is connected to microprocessor by ouput power detection circuit, and the output of microprocessor is connected to the control end of ATT attenuator circuit.
The control method of the utility model microprocessor may further comprise the steps:
(1) give microprocessor with detected magnitude of voltage, this value is designated as U1;
(2) the microprocessor voltage of detection power fiducial value again, this value is designated as U2;
(3) microprocessor compares U1 and U2, and as U1 during smaller or equal to U2, the ATT attenuator circuit is not decayed; As U1 during greater than U2, microprocessor control ATT attenuator circuit is guaranteed U1 smaller or equal to U2, makes peak power output constant.
The WLAN (wireless local area network) two-way amplifier that the utlity model has descending automatic electric-level control is mainly used in the WLAN (wireless local area network) amplifier, descending automatic level control circuit parcel ATT attenuator circuit, ouput power detection circuit, power output fiducial value circuit and the CPU of this amplifier constitute in the test loop, make that descending power amplifier peak power output is constant, guarantee that power amplifier is operated in linear zone, can not damage power tube, to guarantee the normal operation of communication system.Solved because of the different peak power output instabilities that cause amplifier of network interface card power output, caused the deterioration of quality of output signals, its versatility is wide, is not subjected to the restriction of the network interface card of network interface card manufacturer production.
Description of drawings:
Fig. 1 is the theory diagram of existing WLAN (wireless local area network) two-way amplifier;
Fig. 2 is a theory diagram of the present utility model.
Embodiment:
Referring to Fig. 1 and Fig. 2, the utility model comprises the up LNA circuit of conventional equipment, descending power amplifier, radio-frequency (RF) switch, coupler, the envelope detection synchronization signal processing circuit, ON-OFF control circuit and power control circuit, and network interface card and antenna, it is characterized in that: between radio-frequency (RF) switch and descending power amplifier, be connected with the ATT attenuator circuit, be provided with microprocessor in the envelope detection two-way amplifier of described WLAN (wireless local area network) with high directivity, the input of this microprocessor is connected with the power reference reference value, one tunnel output of descending power amplifier is connected to microprocessor by ouput power detection circuit, and the output of microprocessor is connected to the control end of ATT attenuator circuit.Above-mentioned coupler is a directional coupler, and this coupler has two outputs, and one of them is connected to radio-frequency (RF) switch, and another one is connected to the envelope detection synchronization signal processing circuit.
The descending automatic level control circuit parcel of the utility model ATT attenuator circuit, ouput power detection circuit, power output fiducial value circuit and microprocessor constitute a test loop.
● carry out power output at the power amplifier output and detect, ouput power detection circuit is given microprocessor with detected magnitude of voltage, and this value is designated as U1.
● microprocessor is the voltage of detection power fiducial value again, and this value is designated as U2.
● microprocessor compares U1 and U2, and as U1 during smaller or equal to U2, the ATT attenuator circuit is not decayed;
As U1 during greater than U2, CPU calculates the ATT pad value according to certain formula, thereby send number to give the ATT attenuator circuits, guarantees U1 smaller or equal to U2, and the peak power output that is is constant.
Coupler of the present utility model in addition is a directional coupler, and this coupler has two outputs, and one of them is connected to radio-frequency (RF) switch, and another one is connected to the envelope detection synchronization signal processing circuit.Use after the directional coupler, the directivity of entire circuit can be reached more than the 20dB, guarantee the normal switching of up-downgoing.
The utility model mainly is according to the ruuning situation of WLAN (wireless local area network) two-way amplifier in real work, adopt closed loop design to have Gain Automatic control, the assurance peak power output is constant, can realize WLAN (wireless local area network) two-way amplifier versatility at the network interface card of different manufacturers, WLAN (wireless local area network) two-way amplifier with descending automatic electric-level control, can well that it is maximum power output be controlled at nominal value, and power amplifier keeps good linear amplification characteristic, guarantee the original characteristic of signal, the value of EVM in the system can not worsen yet, and guarantees the effect of the former area of coverage.
Claims (2)
1, a kind of WLAN (wireless local area network) two-way amplifier with descending automatic electric-level control, comprise up LNA circuit, descending power amplifier, radio-frequency (RF) switch, coupler, the envelope detection synchronization signal processing circuit, ON-OFF control circuit and power control circuit, and network interface card and antenna, it is characterized in that: between radio-frequency (RF) switch and descending power amplifier, be connected with the ATT attenuator circuit, be provided with microprocessor in the envelope detection two-way amplifier of described WLAN (wireless local area network) with high directivity, the input of this microprocessor is connected with the power reference reference value, one tunnel output of descending power amplifier is connected to microprocessor by ouput power detection circuit, and the output of microprocessor is connected to the control end of ATT attenuator circuit.
2, the WLAN (wireless local area network) two-way amplifier with descending automatic electric-level control according to claim 1, it is characterized in that: described coupler is a directional coupler, this coupler has two outputs, one of them is connected to radio-frequency (RF) switch, and another one is connected to the envelope detection synchronization signal processing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201462281U CN201323578Y (en) | 2008-11-10 | 2008-11-10 | Wireless local area network two-way amplifier with downlink automatic level control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201462281U CN201323578Y (en) | 2008-11-10 | 2008-11-10 | Wireless local area network two-way amplifier with downlink automatic level control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201323578Y true CN201323578Y (en) | 2009-10-07 |
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ID=41160950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201462281U Expired - Fee Related CN201323578Y (en) | 2008-11-10 | 2008-11-10 | Wireless local area network two-way amplifier with downlink automatic level control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201323578Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107743039A (en) * | 2017-11-18 | 2018-02-27 | 国家电网公司 | A kind of GPRS acquisition terminals signal strength self-adapting data test and transmitting device |
| CN107819476A (en) * | 2017-11-18 | 2018-03-20 | 国家电网公司 | The lightning protection antenna and system of a kind of extremely strong and pole weak signal for GPRS acquisition terminals |
-
2008
- 2008-11-10 CN CNU2008201462281U patent/CN201323578Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107743039A (en) * | 2017-11-18 | 2018-02-27 | 国家电网公司 | A kind of GPRS acquisition terminals signal strength self-adapting data test and transmitting device |
| CN107819476A (en) * | 2017-11-18 | 2018-03-20 | 国家电网公司 | The lightning protection antenna and system of a kind of extremely strong and pole weak signal for GPRS acquisition terminals |
| CN107743039B (en) * | 2017-11-18 | 2023-06-02 | 国家电网公司 | GPRS acquisition terminal signal strength self-adaptive data testing and transmitting device |
| CN107819476B (en) * | 2017-11-18 | 2023-08-11 | 国家电网公司 | Lightning protection antenna and system for GPRS acquisition terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091007 Termination date: 20131110 |