CN201114040Y

CN201114040Y - Radio frequency power open-loop control device

Info

Publication number: CN201114040Y
Application number: CNU2007200326707U
Authority: CN
Inventors: 蒋子彬; 王长龙
Original assignee: XI'AN DAWEI COMMUNICATION EQUIPMENT CO Ltd
Current assignee: XI'AN DAWEI COMMUNICATION EQUIPMENT CO Ltd
Priority date: 2007-09-07
Filing date: 2007-09-07
Publication date: 2008-09-10
Anticipated expiration: 2017-09-07

Abstract

The utility model provides a radio frequency power open loop control device, comprising an electronically controlled attenuator which is arranged on a radio frequency output line of a transmitter and a high frequency detector tube which is coupled with the radio frequency output line, wherein, a digital processing system is arranged between an output terminal of the high frequency detector tube and a control terminal of the electronically controlled attenuator. The utility model adopts the high frequency detector tube to detect the transmitter radio frequency output signal power and adopts the digital processing system to compare with the control value; if the radio frequency output signal power is not equal to the control value, the corresponding adjusted voltage is outputted to the electronically controlled attenuator which adjusts the radio frequency output signal power to be equal to the control value. The radio frequency power open loop control device has good control accuracy within 1dB and is easier to realize than a closed loop control device; the radio frequency power open loop control device adopts the high frequency detector tube to replace a logarithm detector tube in the prior closed loop control device to ensure that the high frequency range of the device is relatively wide.

Description

The radio-frequency power open ring control device

Technical field

The utility model relates to a kind of RF powder control device that is used for wireless microwave communication sender, relates in particular to a kind of radio-frequency power open ring control device.

Background technology

In civilian wireless microwave telecommunication system, requirement reduces the electromagnetic interference to surrounding environment as much as possible usually, to lower the interference to other wireless communication systems.With regard to the sender requirement of wireless microwave 13GHz frequency range, maximum power is no more than+20dBm, and the adjustable range of transmitting power is no more than 25dB.Civilian microwave regulation and stipulation, the radio-frequency transmissions carrier power will satisfy certain technical requirements, is controlled to be example with static power, and the maximum power of actual output under general condition error is no more than ± 2dB, the adjustment of static power is differential to be 1dB, the error of permission ± 1dB.In order to reach above-mentioned requirements, in prior art, control mode commonly used is a kind of close-loop control mode, its structure is referring to Fig. 3, the radiofrequency signal of sender output is sent into power amplifier through electrically controlled attenuator 1, through after the power amplification, last feed antenna is transmitted in the air, formed the negative feedback control loop of radiofrequency signal power output by logarithmic detector 5 and voltage comparator 6, when equating fully with the logarithmic detector output voltage, power control loop enters stable state when control voltage (reference voltage of voltage comparator).If will increase the transmitting power of radiofrequency signal, can raise the level of control voltage earlier, under the loop stability state, the level of the output voltage of logarithmic detector is also followed and is raised, its voltage is directly proportional with output signal power, thereby has reached the purpose that increases output signal power; Vice versa.Because logarithmic detector has the favorable linearity characteristic, therefore, this device has improved the precision of power control in theory, but the difficulty that realizes is bigger, if design the bad stability and the control precision that will influence loop work; Simultaneously, at present because the restriction of technology, the high workload frequency range of logarithmic detector is 8GHz, and it has limited the range of application of this closed-loop power control device.

The utility model content

The purpose of this utility model is in order to overcome the shortcoming of prior art, a kind of control precision height is provided, is easy to realize and the radio-frequency power open ring control device of high-frequency band broad.

For achieving the above object, the technical solution of the utility model is as follows:

It comprises the wave detector that is located at the electrically controlled attenuator on the sender radio frequency output line and is of coupled connections with the radiofrequency signal output line, it improves structure: described wave detector is the high frequency detection tube, be provided with a digital processing system between the control end of the output of high frequency detection tube and electrically controlled attenuator, this digital processing system is made of A/D converter, central processing unit and D/A converter.

The further improved technical scheme of the utility model is as follows:

Described data handling system is made of an integrated chip LPC2114.

Also be provided with a narrow band filter on the radiofrequency signal output line of described electrically controlled attenuator, it is used to eliminate the interference of clutter to sender.

By technique scheme as can be seen, the utility model has adopted a kind of open loop control mode, it detects the size of radio frequency output signal power with the high frequency detection tube, send into digital processing system then, digital processing system is compared detected value with controlling value, if two values do not wait, then providing corresponding regulation voltage is added on the electrically controlled attenuator, electrically controlled attenuator is regulated according to the attenuation that this regulation voltage carries out the radiofrequency signal power output, so circulation makes the power of radio frequency output signal equate with controlling value.The utlity model has control precision preferably, its precision can reach ± 0.5dB, can satisfy the control requirement fully, and than the easy realization of closed-loop control device; Simultaneously,, make the high band range broad of wave detector, widened the range of application of this device because it adopts the high frequency detection tube to replace logarithmic detector.

Description of drawings

Fig. 1, functional-block diagram of the present utility model.

Fig. 2, circuit theory diagrams of the present utility model.

The functional-block diagram of Fig. 3, existing closed-loop control device.

Embodiment

Referring to Fig. 1,2, the radiofrequency signal of sender output is sent into electrically controlled attenuator 1 by the radio frequency transmission cable, give power control value of electrically controlled attenuator by digital processing system 4 earlier, make electrically controlled attenuator according to the output that decays of this value, described high frequency detection tube 3 is delivered to detector diode D5 by radio frequency cable 3-1 from the power energy that main output cable 7 is coupled out a part of radiofrequency signal, by voltage signal of its detection output, this voltage signal is sent into digital processing system 4, it converts the voltage signal of detection output to digital signal earlier, calculate the size of the actual radio frequency signal power of this voltage signal representative again, again the actual power value is compared with controlling value, if actual value is greater than controlling value, provide a control voltage ATT after then digital processing system 4 is changed through D/A, the attenuation of electrically controlled attenuator is increased, and then the power of radio frequency output signal reduces; Otherwise the power of radio frequency output signal increases; Till the power of radiofrequency signal equaled controlling value, so loop control can make the power of radio frequency output signal obtain stable output.Described data handling system 4 is made of an integrated chip LPC2114, integrated devices such as A/D converter, central processing unit and D/A converter in this integrated chip.Also be provided with a narrow band filter 2 on the radiofrequency signal output line of this device electrically controlled attenuator 1, it is used to eliminate the interference of clutter to sender.

Claims

1, a kind of radio-frequency power open ring control device, it comprises electrically controlled attenuator (1) that is located on the sender radiofrequency signal output line and the wave detector that is of coupled connections with the radio frequency output line, it is characterized in that: described wave detector is high frequency detection tube (2), be provided with a digital processing system (4) between the control end of the output of high frequency detection tube and electrically controlled attenuator, this digital processing system is made of A/D converter, central processing unit and D/A converter.

2, radio-frequency power open ring control device according to claim 1 is characterized in that: described data handling system (4) is made of an integrated chip LPC2114.

3, radio-frequency power open ring control device according to claim 1 and 2 is characterized in that: also be provided with a narrow band filter (2) on the radiofrequency signal output line of described electrically controlled attenuator (1), it is used to eliminate the interference of clutter to sender.