CN101135710B - Circuit for detecting radio-frequency power amplifier output terminal port communicating condition - Google Patents

Circuit for detecting radio-frequency power amplifier output terminal port communicating condition Download PDF

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Publication number
CN101135710B
CN101135710B CN2007101432089A CN200710143208A CN101135710B CN 101135710 B CN101135710 B CN 101135710B CN 2007101432089 A CN2007101432089 A CN 2007101432089A CN 200710143208 A CN200710143208 A CN 200710143208A CN 101135710 B CN101135710 B CN 101135710B
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China
Prior art keywords
radio
circuit
power amplifier
amplifier output
frequency power
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Expired - Fee Related
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CN2007101432089A
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Chinese (zh)
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CN101135710A (en
Inventor
余敏德
崔晓俊
杨宝娣
延建利
郭艳玲
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ZTE Corp
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ZTE Corp
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Abstract

In the invention, a connection state detecting circuit and a detection comparing circuit are set up at the power amplifying port of the RF circuit. Said connection state detecting circuit comprises a power, a resistor R1 and a resistor R2; the power is connected to the RF circulator of the RF circuit power amplifying port. Said detection comparing circuit comprises: an integrated operational amplifier; the normal phase of the amplifier is connected to a node P located between the R1 and R2; the voltage pin is electrically connected to the power supply of the amplifier; the ground pin of it is grounded; comparing the voltage provided by the power with the threshold voltage at its negative phase side; according to the comparison result, deciding if the connection at the output port of the RF power amplifier is normal.

Description

A kind of circuit that detects radio-frequency power amplifier output terminal port communicating condition
Technical field
The present invention relates to radio circuit in the communication field, particularly a kind of circuit that detects radio-frequency power amplifier output terminal port communicating condition.
Background technology
At present, the antenna feeder subsystem is usually as the output load of radio-frequency power amplifier in the wireless telecommunication system, its whether normally be connected with the power amplifier output port for power amplifier can trouble free service and the wireless system normal communication bigger influence is arranged, therefore whether radio-frequency power amplifier output terminal port communicating condition is normally detected, for the reliability that improves communication system, the normal operation of assurance system is significant.
At present, mainly whether output terminal port communicating condition is normally detected: detect the duty that this port and relevant antenna feeder subsystem connect by the mode that detects this port echo power, when the VSWR of power amplifier delivery outlet is excessive greater than setting range or echo power, then show power amplifier output port fault by following dual mode.
Scheme one: (whether Voltages Standing WaveRatio VSWR), normally detects radio-frequency power amplifier output terminal port communicating condition to utilize the output voltage standing-wave ratio (SWR) that detects this port.
This scheme is by extracting forward and the backward power of power amplifier at output port respectively, and becomes corresponding direct current detection voltage back to obtain the standing-wave ratio (SWR) of this port this power transfer by the radio-frequency power switching device.
But, because the VSWR of the antenna-feedback system of power amplifier output terminal is vulnerable to surrounding environment, temperature for example, trees, buildings blocks, sleet, influences such as feeder cable length, also be reduced to minimum degree simultaneously for influence with the inner forward and reverse two-way power-sensing circuit precision of power amplifier, requirement to circuit design is comparatively strict, usually need to adopt the directed pale pinkish purple device of high directivity or belt device to extract backward power, and the forward and reverse power transfer that adopts the high performance radio frequency wave detector of two-way to extract becomes corresponding direct current signal so that compare processing, also will consider the temperature compensation mode of necessity simultaneously in circuit design.In addition, partial circuit is in order further to improve accuracy of detection, to overcome false alarm and fail to report the alert load that also needs to utilize specific standing-wave ratio (SWR) the VSWR state of communication system is carried out initial calibration, the data of calibration are deposited into utilize software to align that backward power is extracted circuit and forward and reverse detector circuit output signal is proofreaied and correct in the system software, therefore also need to take certain system software resource.
Scheme two: utilize the echo power that detects the power amplifier output port, whether radio-frequency power amplifier output terminal port communicating condition is normally detected.
The principle of this scheme with utilize VSWR basic identical, but can be subjected to surrounding environment such as temperature equally, trees, buildings blocks, sleet, the influence of feeder cable length etc., need also to consider that the power amplifier inner counter extracts the influence of circuit precision and the influence that backward power is extracted the relevant radio-frequency power wave detector precision of circuit to circuit power, usually also need to adopt the directed pale pinkish purple device of high directivity or circulator to extract backward power and, in circuit design, yet will consider necessary temperature compensation mode simultaneously oppositely adopting high performance radio frequency wave detector to convert the backward power of extracting to corresponding direct current signal to carry out corresponding comparison process in the detecting circuit.
In a word, whether the duty that detects the radio-frequency power amplifier output port by such scheme is normal, can there be circuit form complexity, the problem high to requirement on devices, in the part system, further improve system reliability, also need the method that adopts software to proofread and correct in order to overcome possible false alarm.
Summary of the invention
The objective of the invention is to, a kind of circuit that detects radio-frequency power amplifier output terminal port communicating condition is provided, can constitute under the simple prerequisite at circuit, accurately whether the indication output end mouth is connected normally with antenna-feedback system.
The circuit of detection radio-frequency power amplifier output terminal port communicating condition of the present invention is provided with the connection status testing circuit and detects comparator circuit at radio circuit power amplification port to be detected, wherein,
The connection status testing circuit, comprise power supply, resistance R 1 and resistance R 2, described power supply is connected to the radio frequency circulator of described radio circuit power amplification port and radio frequency capacitance C3 and RF high power load R3 ground connection by being connected with described radio frequency circulator by described resistance R 1, R2;
Detect comparator circuit, comprise integrated operational amplifier, its positive terminal is connected to the node P of 2 of resistance R 1 and resistance R in the described connection status testing circuit, its power pin is connected to power supply, its ground pin ground connection, be used for the voltage that power supply is provided and the comparison threshold voltage of its negative phase end and compare, judge according to comparative result whether the radio-frequency power amplifier output port connects normal.
Wherein, described integrated operational amplifier when the voltage that provides at power supply is provided greater than described comparison threshold voltage, judges that radio-frequency power amplifier output port malunion is normal; The voltage that provides at power supply is during less than described comparison threshold voltage, and it is normal to judge that the radio-frequency power amplifier output port connects, and whether connects normal output signal by its signal output pin output expression.
Wherein, described radio circuit to be detected comprises radio-frequency (RF) power amplification pipe A1, power amplifier output coupling capacitance C2, radio frequency circulator D1, antenna-feedback system load RL, and described radio frequency circulator D1 is by radio frequency capacitance C3 and RF high power load R3 ground connection.
Wherein, the negative phase end of described integrated operational amplifier is connected to described power supply by variable resistor, so that described comparison threshold voltage to be provided.
Wherein, described comparison threshold voltage V value is
Wherein, described detection comparator circuit further comprises rf filtering capacitor C 1, and the one end is connected to the positive terminal of described integrated operational amplifier, other end ground connection.
In addition, when the output signal of described integrated operational amplifier was low level, the indication output end mouth was connected with antenna-feedback system normally; When the output signal of described integrated operational amplifier was high level, indication output end mouth and antenna-feedback system malunion were normal.
The invention has the beneficial effects as follows: according to the circuit of detection radio-frequency power amplifier output terminal port communicating condition of the present invention, by increasing the connection status testing circuit and detecting comparator circuit, can constitute under the simple prerequisite at circuit, accurately whether the indication output end mouth is connected normally with antenna-feedback system, and realizes with low cost.
Description of drawings
Fig. 1 is for detecting the concrete schematic diagram of radio-frequency power amplifier output port open-circuit method and device.
Embodiment
Below, describe the circuit of the detection radio-frequency power amplifier output terminal port communicating condition of embodiments of the present invention in conjunction with the accompanying drawings in detail.
As shown in Figure 1, be the circuit diagram of the detection radio-frequency power amplifier output terminal port communicating condition of the embodiment of the invention.
This circuit is to increase in radio circuit to be detected: connection status testing circuit and detection comparator circuit.Wherein, whether normally radio circuit to be detected comprises radio-frequency (RF) power amplification pipe A1, power amplifier output coupling capacitance C2, radio frequency circulator D1, antenna-feedback system load RL, simulation connection status K switch, and the radio frequency circulator is by radio frequency capacitance C3 and RF high power load R3 ground connection.
Wherein, the connection status testing circuit comprises power supply VCC, resistance R 1 and resistance R 2.Wherein, power supply VCC forms the ground connection passage by the direct current input impedance of resistance R 1, R2, circulator D1 and antenna-feedback system.
Detect comparator circuit, comprise integrated operational amplifier, its positive terminal is connected to the node P of 2 of resistance R 1 and resistance R in the connection status testing circuit, its negative phase end is connected to power supply VCC or another power supply by a variable resistor, so that predetermined comparison threshold voltage to be provided, its voltage pin is electrically connected to power supply, its ground pin ground connection.This integrated operational amplifier, the voltage and the comparison threshold voltage that are used for power supply is provided compare, and the voltage that provides at power supply is during greater than comparison threshold voltage, and expression radio-frequency power amplifier output port malunion is normal; The voltage that provides at power supply is during less than comparison threshold voltage, expression radio-frequency power amplifier output port connects normal, and output signal is represented whether output port connects normal by its signal output pin, for example output low level indication output end mouth is connected with antenna-feedback system normally, and output high level indication output end mouth is connected open circuit with antenna-feedback system or fracture appears in antenna-feedback system.
In addition, based on as mentioned above, for filtering interfering can be further increases rf filtering capacitor C 1, ground connection then in the positive terminal of integrated operational amplifier.
Wherein, preferably, comparison threshold voltage V value is
When specific implementation, integrated operational amplifier can adopt international semiconductor (NationalSemiconductor) company, and model is the integrated operational amplifier of LM2904.
Below, in conjunction with a concrete example, describe embodiment of circuit of detection radio-frequency power amplifier output terminal port communicating condition of the present invention in detail.
This circuit is by 1 circulator D1, the resistor R 1 of 2 220K Ω, the high-frequency filter capacitor C1 of R2 and 1 22PF, high frequency capacitance C3,50 Ω high power load R3 and corresponding 5V power supply VCC form, be connected just often with antenna-feedback system at output port, here simulate with the K switch closure, because the antenna feeder input presents the direct current low impedance characteristic, 5V power supply in the connection status testing circuit passes through R1, the resistance of R22 220K Ω, the direct current input impedance of circulator D1 and antenna-feedback system forms the ground connection passage, because the dc impedance of antenna-feedback system is compared low, for R1, the 220K Ω of R2 can ignore substantially, therefore, the P point voltage that resistance R 1 and R2 join be approximately resistance R 1 and R2 for the partial pressure value of 5V voltage about 2.5V, this voltage passes through the voltage positive terminal that integrated operational amplifier is delivered in capacitor C 1 filtering again, because the voltage of 2.5V is lower than the predetermined threshold 3.5V by integrated operational amplifier, therefore detects comparator circuit output low level indication output end mouth and be connected with antenna-feedback system normally; And when antenna-feedback system is connected open circuit or antenna-feedback system appearance fracture with power amplifier, here be equivalent to the K switch open circuit, the connection status testing circuit 5V voltage of output port is by resistance R 1, R2, the ground connection passage of the direct current input impedance of circulator D1 and antenna-feedback system can't form, the output voltage of P node is because the antennal interface end that links to each other with 220K Ω resistance R 2 is a high resistant, therefore P node output voltage is the supply voltage of 5V, this voltage has surpassed the threshold voltage of the voltage comparator of integrated operational amplifier, therefore the work of detected state comparator circuit output high level indication antenna-feedback system is undesired, can finish the function of power amplifier output port and the detection of antenna feeder connection status with this.
Because the impedance phase of the resistance R 2 that links to each other with circulator is very high for the impedance of common 50 Ω of circulator high power load R3, therefore be connected on the isolated port of circulator simultaneously, because the excess power loss that the connection status testing circuit brings and can ignore substantially to the influence of circulator isolation characteristic.
In sum, the embodiment of the circuit of detection radio-frequency power amplifier output terminal port communicating condition of the present invention, by increasing the connection status testing circuit and detecting comparator circuit, can whether be connected normally with antenna-feedback system by the indication output end mouth, have circuit and constitute the characteristics simple, that realization is with low cost, the development technique risk is little.
More than be in order to make those of ordinary skills understand embodiments of the present invention; and the detailed description that embodiments of the present invention are carried out; but can expect; in the scope that does not break away from claim of the present invention and contained, can also make other variation and modification, these variations and revising all in protection scope of the present invention.

Claims (5)

1. a circuit that detects radio-frequency power amplifier output terminal port communicating condition is characterized in that, the connection status testing circuit is set and detects comparator circuit at radio-frequency power amplifier output port to be detected, wherein,
The connection status testing circuit, comprise power supply, resistance R 1 and resistance R 2, described power supply is connected to the radio frequency circulator of described radio-frequency power amplifier output port and radio frequency capacitance C3 and RF high power load R3 ground connection by being connected with described radio frequency circulator by described resistance R 1, R2;
Detect comparator circuit, comprise integrated operational amplifier, its positive terminal is connected to the node P of 2 of resistance R 1 and resistance R in the described connection status testing circuit, its power pin is connected to power supply, its ground pin ground connection, be used for the voltage that power supply is provided and the comparison threshold voltage of its negative phase end and compare, judge according to comparative result whether the radio-frequency power amplifier output port connects normal;
Described radio-frequency power amplifier output port to be detected comprises radio-frequency (RF) power amplification pipe A1, power amplifier output coupling capacitance C2, radio frequency circulator D1, antenna-feedback system load RL.
2. the circuit of detection radio-frequency power amplifier output terminal port communicating condition as claimed in claim 1, it is characterized in that, described integrated operational amplifier when the voltage that provides at power supply is provided greater than described comparison threshold voltage, judges that radio-frequency power amplifier output port malunion is normal; The voltage that provides at power supply is during less than described comparison threshold voltage, and it is normal to judge that the radio-frequency power amplifier output port connects, and whether connects normal output signal by its signal output pin output expression.
3. the circuit of detection radio-frequency power amplifier output terminal port communicating condition as claimed in claim 1 or 2 is characterized in that, the negative phase end of described integrated operational amplifier is connected to described power supply by variable resistor, so that described comparison threshold voltage to be provided.
4. the circuit of detection radio-frequency power amplifier output terminal port communicating condition as claimed in claim 1 or 2, it is characterized in that described detection comparator circuit further comprises rf filtering capacitor C 1, the one end is connected to the positive terminal of described integrated operational amplifier, other end ground connection.
5. the circuit of detection radio-frequency power amplifier output terminal port communicating condition as claimed in claim 2 is characterized in that, when the output signal of described integrated operational amplifier was low level, indication radio-frequency power amplifier output port was connected with antenna-feedback system normally; When the output signal of described integrated operational amplifier was high level, indication radio-frequency power amplifier output port and antenna-feedback system malunion were normal.
CN2007101432089A 2007-08-08 2007-08-08 Circuit for detecting radio-frequency power amplifier output terminal port communicating condition Expired - Fee Related CN101135710B (en)

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CN101893682B (en) * 2010-06-25 2012-12-05 珠海和佳医疗设备股份有限公司 Method for testing resonant power amplifying circuit
US9231531B2 (en) * 2013-12-26 2016-01-05 Mediatek Inc. Communication system and method for detecting loading variation of power amplifier thereof
TWI569027B (en) * 2014-08-29 2017-02-01 明泰科技股份有限公司 Radio frequency apparatus, testing circuit for radio frequency circuit and testing method
CN105548788B (en) * 2014-10-28 2018-12-25 明泰科技股份有限公司 Radio-frequency unit and its adjusting method
CN105846852B (en) * 2015-01-15 2018-12-18 明泰科技股份有限公司 Radio-frequency unit and its adjusting method
CN109412616A (en) * 2018-10-30 2019-03-01 天津津航计算技术研究所 A kind of radio frequency sending set open loop protection circuit and method
CN112213966A (en) * 2019-07-10 2021-01-12 佛山市顺德区美的电热电器制造有限公司 Port detection device and method and cooking appliance

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CN1204902A (en) * 1997-06-27 1999-01-13 日本电气株式会社 Transmitter/receiver having antenna failure detection system
US6437577B1 (en) * 1999-05-22 2002-08-20 Nokia Mobile Phones Ltd. Circuit to test the working of at least one antenna
CN1744476A (en) * 2004-08-31 2006-03-08 中兴通讯股份有限公司 Method and device for detecting connection state of antenna and feed line
CN1940581A (en) * 2005-09-30 2007-04-04 联想(北京)有限公司 Method and device for inspecting display unit connecting state

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
CN1204902A (en) * 1997-06-27 1999-01-13 日本电气株式会社 Transmitter/receiver having antenna failure detection system
US6437577B1 (en) * 1999-05-22 2002-08-20 Nokia Mobile Phones Ltd. Circuit to test the working of at least one antenna
CN1744476A (en) * 2004-08-31 2006-03-08 中兴通讯股份有限公司 Method and device for detecting connection state of antenna and feed line
CN1940581A (en) * 2005-09-30 2007-04-04 联想(北京)有限公司 Method and device for inspecting display unit connecting state

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