CN201303322Y - Power amplifier protective device for ultra high frequency (UHF) transmitter - Google Patents
Power amplifier protective device for ultra high frequency (UHF) transmitter Download PDFInfo
- Publication number
- CN201303322Y CN201303322Y CNU2008201642937U CN200820164293U CN201303322Y CN 201303322 Y CN201303322 Y CN 201303322Y CN U2008201642937 U CNU2008201642937 U CN U2008201642937U CN 200820164293 U CN200820164293 U CN 200820164293U CN 201303322 Y CN201303322 Y CN 201303322Y
- Authority
- CN
- China
- Prior art keywords
- output
- power amplifier
- power
- input
- signal
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a power amplifier protective device for an ultra high frequency (UHF) transmitter, which comprises an input overpower protection unit, an output overpower protection unit, an output standing wave ratio protection unit, a power amplifier, an output sampling unit, a power amplifier control unit, a temperature detection module and a power supply detection module. A radio-frequency signal passes through the input overpower protection unit, the output overpower protection unit and the output standing wave ratio protection unit to enter into the power amplifier, and finally passes through the output sampling unit; and the power amplifier control unit is used for loading a control program by a control center to obtain various data under the power amplifier operating state, and controlling the input overpower protection unit, the output sampling unit, the output standing wave ratio protection unit and the power supply detection module. The power amplifier protective device effectively integrates multiple units as a whole, and effectively and reliably protects the power amplifier of the UHF transmitter, thereby improving the operational reliability and the service life of the transmitter.
Description
Technical field
The utility model relates to digital television broadcasting and transmitter of mobile communications system technology, is specially adapted to the power amplifier protection device of UHF broadband digital TV and radio emission machine.
Background technology
In mobile communication system and digital broadcast communications system, particularly digital television broadcasting communication system, for satisfying the big requirement of its coverage, its transmitter radio frequency power output is all very big, reaches multikilowatt.Radio-frequency (RF) power amplification in the transmitter all is operated in the high-power state of big electric current, and the performance of radio-frequency (RF) power amplification directly influences the performance and the electromagnetism coverage effect of system.Work safely and reliably in order to make radio-frequency (RF) power amplification; in power amplifier, need fairly perfect power amplifier protection automatic control circuit; such as high temperature protection, the protection of output standing-wave ratio, power faiture safe in input overpower protection, output overpower protection, the machine, make the radio-frequency (RF) power amplification of transmitter export big radio-frequency power under the premise that security is guaranteed.Being operated in the very wide frequency range of wideband section transmitter power amplifier, the frequency of digital television broadcasting system is 470～860MHz, and the operating characteristic difference of power amplifier in so wide frequency range is very big, realizes that the factor that above-mentioned protection need consider is a lot, and difficulty also increases greatly.
Protection to the transmitter power amplifier at present all is primarily aimed at narrow-band communication system, and as GSM, CDMA, WCDMA, the method for employing is the mode of directly closing.For example; when the temperature that detects transmitter is too high (temperature of transmitter surpasses predefined high temperature thresholding); the method that the transmitter power amplifier is closed in general direct employing is protected; can protect power amplifier though adopt this method; but the coverage of transmitter has not had; communication is interrupted fully, and influence is professional.Television broadcasting is had higher requirement to the power amplifier protection of transmitter to the fast development of digitlization direction.For 470～860MHz UHF digital TV transmitter, it has following characteristics: the non-constant width of working band, 390MHz is arranged, cause transmitter very big, and the P1dB compression point of last stage of transmitter power amplifier difference in this frequency range is also very big in the gain fluctuation of whole frequency; The signal of emission adopts the 64QAM modulation system, and the PAR peak to average ratio of signal is very high, and up to arriving 12dB, peak power is easy to reach the P1dB compression point during power amplifier work; The range of transmitter input signal is bigger, and general to require the scope at the input signal of transmitter power amplifier be-10～0dBm, this require power amplifier input signal from-power amplifier can also operate as normal when 10dBm jumped to 0dBm suddenly; The power output of transmitter is very big, and average power reaches kilowatt, and electric current is all very big during power amplifier work.These features all make 470～860MHz UHF transmitter power amplifier be very easy to be burnt, and power amplifying device is a part the most expensive in the transmitter.This just requires the safeguard measure of power amplifier exhaustive, is quick on the draw.
The utility model content
Technical problem to be solved in the utility model provides a kind of power amplifier protection device of UHF wideband section transmitter, guarantees the performance and the quality of transmitter power amplifier, reduces the influence of power amplifier to systematic function.
For addressing the above problem the power amplifier protection device of the UHF wideband section transmitter that the utility model proposes, comprise that input overpower protection unit, output overpower protection and output standing-wave ratio protected location, power amplifier, output sampling unit, power amplifier control unit, temperature detection, power supply detect, control method; Radiofrequency signal is at first by input overpower protection unit, and next is by output overpower protection and output standing-wave ratio protected location, and the ingoing power amplifier passes through the output sampling unit at last then; Described power amplifier control unit is that control centre is used for the Loading Control program; it obtains the various data of power amplifier work state from input overpower protection unit, output sampling unit, temperature detection, power supply detection module; and analyzing and processing is judged these data, setting control input overpower protection unit, output overpower protection and output standing-wave ratio protected location, power supply detection.
The status input signal, compensation wideband section power amplifier of the power amplifier gain flatness in whole frequency is mainly determined in input overpower protection unit.It comprises coupler, numerical-control attenuator, radio-frequency (RF) switch, input power detector, comparator; Radio-frequency input signals by numerical-control attenuator, passes through radio-frequency (RF) switch then at last at first by coupler; The sampling of radio-frequency signal coupler, for guaranteeing input signal power accuracy of detection in 470～860MHz broad frequency range, the sampling flatness need be less than ± 0.2dB in the whole frequency band scope.The watt level of the π type attenuator adjustment sampling radiofrequency signal that R2, R3, R4 form, help improving accuracy of detection and improve the dynamic range that detects, the size of these three resistance need be determined according to the power of input signal, the sampling rate of coupler, the factors such as detection range that input detects.Inject the voltage signal that power detector becomes can measure to adjusted sampling radiofrequency signal power transfer.Voltage signal after the conversion is divided into two-way, and one the tunnel is input to the A/D sampling module in the power amplifier control unit, carries out quantitative analysis and handles the size that obtains input power; Other one the road enters into comparator, input power thresholding setting signal in the comparator is set by the A/D module of power amplifier control unit, the threshold signal of setting make input power in the scope that requires (as-10dBm～0dBm), the output of comparator is a high-low level, the control radio-frequency (RF) switch.If input signal in the scope of setting, the comparator output low level, the radio-frequency (RF) switch closure, input signal can enter into power amplifier; If input signal is not in the scope of setting, comparator is exported high level, and radio-frequency (RF) switch disconnects, and input signal can not enter into power amplifier.Radio-frequency (RF) switch requires high-isolation, 50dB at least when disconnecting; The closed low Insertion Loss of time requirement.Numerical-control attenuator in the radio frequency path be 0.5dB stepping, dynamic range be 30dB, by the attenuator of 6 position digital signals control, its attenuation is controlled by the power amplifier control unit, at different frequency different attenuations is set, the flatness of compensation power amplifier in 470～860MHz scope, concrete operations see control method for details.
Output overpower protection and output standing-wave ratio protected location comprise voltage-controlled attenuator U1, NPN transistor, PNP transistor, operational amplifier U2, quick comparator U3/U4, resistance R 5/R6, capacitor C 1/C2/C3; Pin of described voltage-controlled attenuator U1 connects input (node 1), and a pin connects output (node 2), and a pin connects voltage controling end (node 3); Described NPN transistor, the E utmost point connects node 3, the B utmost point connects node 9, the C utmost point connect node 4 (+12V); Described PNP transistor, the E utmost point connects node 9, and the B utmost point connects node 11, and the C utmost point connects node 10 (GND); Described operational amplifier U2, homophase terminated nodes 5 (output setting signal), anti-phase terminated nodes 7, output terminated nodes 8; Described quick comparator U3, homophase terminated nodes 13 (output overpower setting signal), anti-phase terminated nodes 12 (power output voltage signal), output terminated nodes 11; Described quick comparator U4, homophase terminated nodes 15 (output standing-wave ratio setting signal), anti-phase terminated nodes 14 (reflection power voltage signal), output terminated nodes 11; Described resistance R 5, one pin connect node 8, one pin and connect node 9; Described resistance R 6, one pin connect node 6 (power output voltage signal), and a pin connects node 7; Described capacitor C 1, one pin connects node 7, one pin and connects node 8; Described capacitor C 2, one pin connect node 7, one pin ground connection (GND); Described capacitor C 3, one pin connect node 11, one pin ground connection (GND).
The output sampling unit comprises coupler, resistance, output power detector, reflected power detector; Described coupler working frequency range is 470～860MHz, and Insertion Loss is less than 0.3dB in this frequency range, and the sampling flatness is less than ± 0.2dB; Described output power detector is that the power transfer of radiofrequency signal is become voltage signal with reflected power detector, and it must be the true value power detector, and it can be ADL5501.
Temperature detection, it can detect the working temperature of power amplifier, and it can be LM75CIMM.
Power supply detects, it can detect power supply whether fault, detect the power amplifier electric current, and the power supply that can turn-off power amplifier.
The power amplifier control unit, it is a microprocessor system; Described micro controller system comprises the 10bit A/D converter, and the voltage signal of simulating is converted to digital signal; Described micro controller system comprises the ARM kernel, can move complicated algorithm; Described micro controller system comprises memory module, is used for stored program and data; Described micro controller system comprises the 10bitD/A transducer, and digital signal is converted to analog voltage signal; MCU in the described micro controller system can be LPC2103; Control method, control method comprises as follows:
A. some parameters of initialization comprise input signal power bound, power output set point, output standing-wave ratio set point, output overpower set point, power amplifier temperature bound;
If b. detect input signal power not in the bound scope of setting the time, close power amplifier, radio-frequency (RF) switch disconnects, and numerical-control attenuator as claimed in claim 2 is set to 30dB;
If c. detect input signal power in the bound scope of setting, the voltage switch that is communicated with power amplifier is communicated with radio-frequency (RF) switch, and numerical-control attenuator is that stepping begins to successively decrease from 30dB with 1dB, whenever the 1dB that successively decreases needs to detect power output, judges whether power output reaches the power output set point; If do not reach set point, continue to successively decrease, till the value of numerical-control attenuator is 0dB; If reach set point, the value of the numerical-control attenuator 2dB (step footpath become 0.5dB) that successively decreases again;
D. detect the power amplifier electric current when undesired, close power amplifier, radio-frequency (RF) switch disconnects, and numerical-control attenuator is set to 30dB;
E. detect the output standing-wave ratio when undesired, close power amplifier, radio-frequency (RF) switch disconnects, and numerical-control attenuator is set to 30dB;
F. detected temperatures, if temperature surpasses the temperature threshold of setting, then power output reduces 3dB, wait for 10 minutes, if temperature still surpasses the thresholding of setting, power output reduces 3dB again, wait for 10 minutes again,, then close power amplifier if temperature also is higher than the temperature threshold of setting; Instead then, if after temperature is reduced to a certain temperature, power output rise 3dB.
When g. setting new power output, repeating step b, c.
The effect that the utility model is useful: the utility model apparatus and method are by combining plurality of units effectively; the power amplifier of comprehensive effective reliably protecting UHF wideband section transmitter; increase the reliability and the physical life of transmitter work; can effectively protect UHF wideband section transmitter power amplifier, guarantee the performance and the quality of power amplifier.
Description of drawings
Accompanying drawing 1 is the entire block diagram of the utility model device;
Accompanying drawing 2 is input overpower protection unit block diagrams;
Accompanying drawing 3 is output overpower protection and output standing-wave ratio protected location block diagram;
Accompanying drawing 4 is output sampling unit block diagrams.
Embodiment
Below in conjunction with drawings and Examples the utility model is done to describe further:
The utility model apparatus and method are at the wide-band transmitter power amplifier.From the input and output characteristic of power amplifier, existing software has hardware to come the omnibearing protection power amplifier again.This device comprises that mainly input overpower protection unit, output overpower protection and output standing-wave ratio protected location, power amplifier, output sampling unit, power amplifier control unit, temperature detection, power supply detect, control method.Radiofrequency signal is at first by input overpower protection unit, and next is by output overpower protection and output standing-wave ratio protected location, and the ingoing power amplifier passes through the output sampling unit at last then; Described power amplifier control unit is that control centre is used for the Loading Control program; it obtains the various data of power amplifier work state from modules such as input overpower protection unit, output sampling unit, temperature detection, power supply detections; and analyzing and processing is judged these data, setting control input overpower protection unit, output overpower protection and output standing-wave ratio protected location, power supply detection.
1. input overpower protection unit (as Fig. 2) comprises coupler, numerical-control attenuator, radio-frequency (RF) switch, input power detector, comparator; Radio-frequency input signals by numerical-control attenuator, passes through radio-frequency (RF) switch then at last at first by coupler.Radiofrequency signal is taken a sample by coupler, and for guaranteeing the accuracy of detection in 470～860MHz broad frequency range, the sampling flatness of coupler in 470～860MHz broad frequency range need be less than ± 0.2dB.Radiofrequency signal watt level after the π type attenuator adjustment sampling that R2, R3, R4 form, make the input power detector reach best precision and maximum detection range, the resistance size of three resistance is obtained by attenuation, and attenuation is determined by the sampling ratio of radio-frequency input signals watt level, coupler, the detection range of input power detector etc.The voltage signal that the input power detector becomes can measure adjusted sampling radiofrequency signal power transfer.The voltage signal that converts to is divided into two-way, and one the tunnel enters the A/D module of power amplifier control unit, carries out quantitative analysis and handles the watt level that obtains the input radio frequency signal; Another road enters comparator and the high low threshold of predefined input signal power and compares and draw a high-low level and control radio-frequency (RF) switch, the high low threshold of input signal power by the power amplifier control unit by the D/A module settings.If input signal power in setting threshold range, the comparator output low level, the radio-frequency (RF) switch closure, the low Insertion Loss of input radio frequency signal passes through; If input signal power is not in setting threshold range, the high point of comparator output is flat, and radio-frequency (RF) switch disconnects, and the input radio frequency signal just can not enter power amplifier.Numerical-control attenuator in the radio frequency link is that 0.5dB stepping, dynamic range are 30dB, by the power amplifier control unit its attenuation are set, in 470～860MHz wideband section, the power amplifier control unit can be according to the frequency of input signal, the watt level of input signal, power amplifier is determined numerical-control attenuator in the factors such as gain characteristic of this frequency attenuation, the gain flatness of compensation power amplifier in broadband makes the best gain that is operated in of power amplifier.The concrete operations of attenuator see control method for details.
2. export overpower protection and output standing-wave ratio protected location (as Fig. 3); when the power output of power amplifier surpasses predefined output overpower thresholding or reflection power and surpasses predefined output standing-wave ratio thresholding, this element can be in several nS rapidly the radio-frequency input signals power attenuation of power amplifier to minimum.Comprise voltage-controlled attenuator U1, NPN, PNP, operational amplifier U2, quick comparator U3/U4, resistance R 5/R6, capacitor C 1/C2/C3.Voltage-controlled attenuator U1 is subjected to voltage-controlled attenuator, and control voltage is big more, and its attenuation is more little; Otherwise control voltage is more little, and its attenuation is big more.Voltage-controlled input directly links to each other with the output of input protection unit, and the input of output and power amplifier links to each other.Operational amplifier U2, resistance R 5/R6, capacitor C 1/C2, NPN transistor are formed the power output initialization circuit, the fundamental voltage size of control voltage-controlled attenuator.The power output voltage signal of output sampling unit is at first undertaken after the filtering average treatment to the inverting input of operational amplifier U2 by R6 and C2, and the power amplifier control unit connects the in-phase input end of operational amplifier U2 by the output setting signal of D/A module settings.The homophase and the end of oppisite phase of operational amplifier compare mutually, by capacitor C 1 integration, voltage of output output at operational amplifier, this voltage is input to NPN transistor after by resistance R 5, emitter following gets the control voltage of voltage-controlled attenuator to the end, and this control voltage makes the power output voltage signal equal to export setting signal.The NPN transistor effect is the current driving ability that improves operational amplifier.Output overpower protection and the protection of output standing-wave ratio realize by transistor PNP, capacitor C 3, quick comparator U3/U4.The power amplifier control unit is exported the in-phase input end that the overpower signal meets quick comparator U3 by the D/A module settings, and the power output voltage signal connects the inverting input of quick comparator U3.When the power output voltage signal surpasses output overpower setting signal, the output of comparator is a low level fast, the PNP transistor turns, the output voltage of operational amplifier U2 discharges to ground fast by resistance R 5 and PNP transistor, the control voltage that makes voltage-controlled attenuator is 0 attenuation maximum, this moment, the power output voltage signal was certainly less than output overpower setting signal, the output level of comparator is by resistance R 5, PNP transistor and capacitor C 3 form charging circuit and slowly increase, the control voltage of voltage-controlled attenuator also slowly increases, and probably needs tens mS that power output is recovered till the set point.The output setting signal must be less than output overpower setting signal.The process of output standing-wave ratio protection is the same with the protection process of power output; if but continuous 3 detection output standing-wave ratios are bad; the power amplifier control unit can be closed power amplifier, and the numerical-control attenuator in the input protection unit is set to 30dB, and the radio-frequency (RF) switch of input protection unit is disconnected.Output overpower protection and the protection of output standing-wave ratio both can be worked separately, and the effect of can joining together does not again have influence each other.
3. output sampling unit (as Fig. 4) to the sampling of radio frequency output signal power, feeds back to power amplifier control unit, output overpower protection and output words standing-wave ratio protected location.The radio frequency output signal of power amplifier is by coupler sampling radio frequency output signal and RF-reflective signal.The output signal that sampling is come out is by the watt level of the attenuator adjustment sampling output signal of resistance R 6/R7/R8 composition.Output power detector becomes voltage signal to the power transfer of adjusted sampling radio frequency output signal.The power output voltage signal that conversion is come out is divided into two-way, and one tunnel A/D module that enters the power amplifier control unit is carried out the quantitative analysis processing and obtained the power output size, and other one the tunnel feeds back to output overpower protection and output standing-wave ratio protected location.The reflected signal that sampling is come out is by the watt level of the attenuator adjustment sampling reflected signal of resistance R 9/R10/R11 composition.Reflected power detector becomes voltage signal to the power transfer of adjusted sampling RF-reflective signal.The reflection power voltage signal that conversion is come out is divided into two-way, and one tunnel A/D module that enters the power amplifier control unit is carried out the quantitative analysis processing and obtained the reflection power size, and another road feeds back to output overpower protection and output standing-wave ratio protected location.The power output size and the reflection power size that detect can calculate the output port standing-wave ratio.
4. temperature detection, it can detect the working temperature of power amplifier, and reads analyzing and processing by the power amplifier control unit, makes the control of corresponding temperature.
5. power supply detects, it can detect power supply whether fault, detect the power amplifier electric current, and the power supply that can turn-off power amplifier.The data that power supply detects read analyzing and processing by the power amplifier control unit, and make control corresponding.
6. power amplifier control unit, it is a microprocessor system.Comprise the 10bit A/D converter, the voltage signal of simulating is converted to digital signal.Comprise the ARM kernel, can move complicated algorithm, calculate input power, power output, reflection power, power amplifier electric current etc.Comprise memory module, be used for stored program and data.Comprising the 10bit D/A converter, is analog voltage signal with the conversion of signals of numeral, sets each thresholding.
7. control method, control method comprises as follows:
A. some parameters of initialization comprise input signal power bound, power output set point, output standing-wave ratio set point, output overpower set point, power amplifier temperature bound;
If b. detect input signal power not in the bound scope of setting the time, close power amplifier, described radio-frequency (RF) switch disconnects, and described numerical-control attenuator is set to 30dB;
If c. detect input signal power in the bound scope of setting, the voltage switch that is communicated with power amplifier, be communicated with described radio-frequency (RF) switch, described numerical-control attenuator is that stepping begins to successively decrease from 30dB with 1dB, whenever the 1dB that successively decreases needs to detect power output, judges whether power output reaches the power output set point; If do not reach set point, continue to successively decrease, till the value of numerical-control attenuator is 0dB; If reach set point, the value of the numerical-control attenuator 2dB (step footpath become 0.5dB) that successively decreases again;
D. detect the power amplifier electric current when undesired, close power amplifier, described radio-frequency (RF) switch disconnects, and described numerical-control attenuator is set to 30dB;
E. detect the output standing-wave ratio when undesired, close power amplifier, described radio-frequency (RF) switch disconnects, and described numerical-control attenuator is set to 30dB;
F. detected temperatures, if temperature surpasses the temperature threshold of setting, then power output reduces 3dB, wait for 10 minutes, if temperature still surpasses the thresholding of setting, power output reduces 3dB again, wait for 10 minutes again,, then close power amplifier if temperature also is higher than the temperature threshold of setting; Instead then, if after temperature is reduced to a certain temperature, power output is recovered 3dB.
When g. setting new power output, repeating step b, c.
Be understandable that; for a person skilled in the art; can be equal to replace or change according to the design of the technical solution of the utility model and utility model and just can be used for realizing the power protection, and all these changes or replacement all should belong to the protection range of the appended claim of the utility model in other frequency range.
Claims (5)
1. the power amplifier protection device of a UHF wideband section transmitter is characterized in that: this device comprises input overpower protection unit, output overpower protection and output standing-wave ratio protected location, power amplifier, output sampling unit, power amplifier control unit, temperature detecting module and power supply detection module; Radiofrequency signal is at first by input overpower protection unit, and next is by output overpower protection and output standing-wave ratio protected location, and the ingoing power amplifier passes through the output sampling unit at last then.
2. the power amplifier protection device of UHF wideband section transmitter according to claim 1 is characterized in that: described input overpower protection unit comprises coupler, numerical-control attenuator, radio-frequency (RF) switch, input power detector and comparator; Radio-frequency input signals by numerical-control attenuator, passes through radio-frequency (RF) switch then at last at first by coupler; Enter into after the π type attenuator adjustment watt level of the sampling end of described coupler by R2, R3, R4 composition and inject power detector; The sampling flatness of described coupler in 470～860MHz broad frequency range is less than ± 0.2dB; Described numerical-control attenuator be 0.5dB stepping, dynamic range be 30dB, by the attenuator of 6 position digital signals control; Described radio-frequency (RF) switch is the radio frequency link switch of high-isolation single-pole double throw, and the low Insertion Loss of radiofrequency signal passes through when closed, and the loss during disconnection between the input and output is greater than 50dB; Described input power detector is used for the power transfer of radiofrequency signal is become voltage signal; The output signal of described comparator is used to control radio-frequency (RF) switch.
3. the power amplifier protection device of UHF wideband section transmitter according to claim 1 is characterized in that: described output overpower protection and output standing-wave ratio protected location comprise voltage-controlled attenuator U1, NPN transistor, PNP transistor, operational amplifier U2, quick comparator U3/U4, resistance R 5/R6, capacitor C 1/C2/C3; Pin of described voltage-controlled attenuator U1 connects input, and a pin connects output, and a pin connects voltage controling end; Described NPN transistor, the E utmost point connects node 3, and the B utmost point connects node 9, and the C utmost point connects node 4; Described PNP transistor, the E utmost point connects node 9, and the B utmost point connects node 11, and the C utmost point connects node 10; Described operational amplifier U2, homophase terminated nodes 5 is used to export setting signal, anti-phase terminated nodes 7, output terminated nodes 8; Described quick comparator U3, homophase terminated nodes 13 is used to export the overpower setting signal, and anti-phase terminated nodes 12 is used for the power output voltage signal, output terminated nodes 11; Described quick comparator U4, homophase terminated nodes 15 is used to export the standing-wave ratio setting signal, and anti-phase terminated nodes 14 is used for the reflection power voltage signal, output terminated nodes 11; Described resistance R 5, one pin connect node 8, one pin and connect node 9; Described resistance R 6, one pin connect node 6 power output voltage signals, and a pin connects node 7; Described capacitor C 1, one pin connects node 7, one pin and connects node 8; Described capacitor C 2, one pin connect node 7, one pin ground connection; Described capacitor C 3, one pin connect node 11, one pin ground connection.
4. the power amplifier protection device of UHF wideband section transmitter according to claim 1 is characterized in that: described output sampling unit comprises coupler, resistance, output power detector, reflected power detector; Described coupler working frequency range is 470～860MHz, and Insertion Loss is less than 0.3dB in this frequency range, and the sampling flatness is less than ± 0.2dB; Described output power detector is used for the power transfer of radiofrequency signal is become voltage signal with reflected power detector, adopts the true value power detector.
5. the power amplifier protection device of UHF wideband section transmitter according to claim 1 is characterized in that: described power amplifier control unit comprises the 10bit A/D converter, is used for the voltage signal of simulation is converted to digital signal; The ARM kernel is used to move complicated algorithm; Memory module is used for stored program and data; The 10bit D/A converter is used for digital signal is converted to analog voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201642937U CN201303322Y (en) | 2008-09-17 | 2008-09-17 | Power amplifier protective device for ultra high frequency (UHF) transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201642937U CN201303322Y (en) | 2008-09-17 | 2008-09-17 | Power amplifier protective device for ultra high frequency (UHF) transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201303322Y true CN201303322Y (en) | 2009-09-02 |
Family
ID=41086951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201642937U Expired - Fee Related CN201303322Y (en) | 2008-09-17 | 2008-09-17 | Power amplifier protective device for ultra high frequency (UHF) transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201303322Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916708A (en) * | 2012-10-19 | 2013-02-06 | 北京中科飞鸿科技有限公司 | Power adjustment device of radio emitter and radio emitter |
| CN105676189A (en) * | 2015-12-18 | 2016-06-15 | 四川九洲电器集团有限责任公司 | Power transmitter |
| CN109274384A (en) * | 2018-11-19 | 2019-01-25 | 重庆邮电大学 | A kind of DMB transmitter automatic protection circuit based on power measurement |
| CN109828242A (en) * | 2019-03-21 | 2019-05-31 | 中国电子科技集团公司第十四研究所 | A kind of transmitter Control protection system |
| CN110176907A (en) * | 2019-06-26 | 2019-08-27 | 深圳市博威射频科技有限公司 | RF power amplification protects circuit and its control method |
| CN116735936A (en) * | 2023-08-15 | 2023-09-12 | 北京交通大学 | Closed-loop control circuit for frequency response flatness of broadband resistor divider |
-
2008
- 2008-09-17 CN CNU2008201642937U patent/CN201303322Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916708A (en) * | 2012-10-19 | 2013-02-06 | 北京中科飞鸿科技有限公司 | Power adjustment device of radio emitter and radio emitter |
| CN105676189A (en) * | 2015-12-18 | 2016-06-15 | 四川九洲电器集团有限责任公司 | Power transmitter |
| CN109274384A (en) * | 2018-11-19 | 2019-01-25 | 重庆邮电大学 | A kind of DMB transmitter automatic protection circuit based on power measurement |
| CN109828242A (en) * | 2019-03-21 | 2019-05-31 | 中国电子科技集团公司第十四研究所 | A kind of transmitter Control protection system |
| CN110176907A (en) * | 2019-06-26 | 2019-08-27 | 深圳市博威射频科技有限公司 | RF power amplification protects circuit and its control method |
| CN116735936A (en) * | 2023-08-15 | 2023-09-12 | 北京交通大学 | Closed-loop control circuit for frequency response flatness of broadband resistor divider |
| CN116735936B (en) * | 2023-08-15 | 2023-10-13 | 北京交通大学 | Closed-loop control circuit for frequency response flatness of broadband resistor divider |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101378262B (en) | Power amplifier protection device and method for UHF wide-band transmitter | |
| CN201303322Y (en) | Power amplifier protective device for ultra high frequency (UHF) transmitter | |
| CN105594121B (en) | Power amplifier with input power protection circuit | |
| CN102904532B (en) | Transmit circuit, regulate the method for bias and the method for adaptive bias information offer | |
| US7061993B2 (en) | CDMA receiver architecture for lower bypass switch point | |
| CN106464392B (en) | RF transceiver front-end module with the improved linearity | |
| US8452243B2 (en) | System and method for power detection in a power amplifier using an adjustable load | |
| CN102142817B (en) | Input power overload protecting circuit and system and input power overload protection method | |
| JPH09148852A (en) | Transmission output variable device | |
| KR100450934B1 (en) | A high efficiency stage-switching cdma power amplifier | |
| KR20020015946A (en) | Matching apparatus | |
| US8385853B2 (en) | System and method for power detection in a power amplifier | |
| CN203645631U (en) | Radio frequency module smart protecting device | |
| CN102170653A (en) | Base station radio frequency system and protection method of power amplifier | |
| CN104270103A (en) | Pre-distortion power amplification radio frequency link, radio frequency power amplifier and fault handling method thereof | |
| CN201663698U (en) | Power detection circuit | |
| CN210490846U (en) | Half-duplex multi-band antenna control system for terminal of Internet of things | |
| KR100347308B1 (en) | Circuit providing RF and power for antenna tower | |
| CN106571779A (en) | Energy-saving type adaptive power amplifier | |
| CN1239610A (en) | Method and device for increasing anti-interference of receiver | |
| CN101959294B (en) | Mismatching processing methods and device for power amplifier of wireless transmitter | |
| CN211352183U (en) | Feedback receiver circuit and electronic equipment | |
| CN217037166U (en) | Radio frequency amplifying circuit, radio frequency system and wireless communication equipment | |
| CN110912519A (en) | Digital predistortion processing circuit and signal processing apparatus | |
| CN210927583U (en) | Two-stage protection circuit for RF power amplitude limiting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090902 Termination date: 20140917 |
|
| EXPY | Termination of patent right or utility model |