CN104698360A - Debug method of power amplification modules - Google Patents
Debug method of power amplification modules Download PDFInfo
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- CN104698360A CN104698360A CN201310652417.1A CN201310652417A CN104698360A CN 104698360 A CN104698360 A CN 104698360A CN 201310652417 A CN201310652417 A CN 201310652417A CN 104698360 A CN104698360 A CN 104698360A
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Abstract
The invention relates to a debug method of power amplification modules. The debug method mainly includes checking before power-on, to be specific, subjecting the power amplification modules to viewing and checking, measuring, classifying and managing; static debugging, to be specific, by adding current and voltage required by the technical indicator onto the power amplification modules, initially detecting accuracy of the power amplification modules; dynamic debugging, to be specific, by inputting dynamic signals to the power amplification modules, observing data of the power amplification modules with power amplified; managing and assembling after power-off, to be specific, managing the recorded data and, on the basis of the data managed, assembling the power amplification modules according to the technical requirements. The debug method can quickly, accurately and formally debug various power amplification modules.
Description
Technical field
The present invention relates to a kind of adjustment method of power amplifier module, particularly relate to a kind of universal adjustment method being applicable to the power amplifier module that in technical field of radio, various power amplifier module is debugged fast and accurately.
Background technology
Ground signal transmission system is the important component part of broadcast television technique, and its important composition is exactly TV Transmitter, along with development and the renewal of TV Transmitter, no matter is simulation or digital transmitter, all adopts modular design.As shown in Figure 1, it forms primarily of driver 11, power amplifier 12, wave filter 13 and antenna 14 the composition structure of transmitter, and is equipped with power distribution equipment 15, display control unit 16, supply unit 17 and cooling device 18.Wherein, the composition structure of power amplifier as shown in Figure 2, it forms primarily of power divider 21, power combiner 23 and multiple power amplifier unit 22, and each power amplifier unit 22 is also equipped with power supply 24 respectively, provides electric energy needed for each power amplifier unit 22 by power distribution equipment 25 to each power supply 24 distribution.Wherein, as shown in Figure 3, it forms primarily of pre-level power amplifier 31, promotion level power amplifier 32 and the final stage power amplifier 33 of promoting the composition structure of each power amplifier unit, and final stage power amplifier 33 comprises multiple power amplifier module 331.Power amplifier module 331 is most basic composition unit of transmitter as seen from Figure 3, transmitter reaches the object of power amplification just by various different types of power amplifier module 331 of different metal-oxide-semiconductor field effect transistors composition, therefore the debugging of power amplifier module 331 just seems particularly important to transmitter.
For the debug process of power amplifier module, an at present not general and flow process for standard.Due to the job category of different types of power amplifier module, frequency of operation, operating voltage, working current, working method and working index etc. also exist many differences, and the number of power amplifier module required for the transmitter of different capacity grade is also different, therefore the adjustment method of these power amplifier modules is not identical yet, some problems are so just produced: due to the method that the debugging neither one of power amplifier module is general, some problem that power amplifier module occurs in advance may until the later stage just can be found, needs are given and solution, owing to having striden across many links, solve to get up to bother very much, loaded down with trivial details, because the adjustment method versatility of current power amplifier module is not strong, the debugging of all kinds of power amplifier module can not be applicable to, therefore when producing in enormous quantities, quick reply cannot be accomplished.
In view of this fall into, the design people based on being engaged in the practical experience and professional knowledge that this type of product design manufacture enriches for many years, and coordinates the utilization of scientific principle, actively in addition research and innovation, through constantly research, design, and after repeatedly improving, finally create the present invention had practical value.
Summary of the invention
Fundamental purpose of the present invention is, the defect that the adjustment method overcoming existing power amplifier module exists, and provides a kind of adjustment method of new power amplifier module, technical matters to be solved makes it can be quick, accurately, the debugging completing various power amplifier module of specification, is very suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.The adjustment method of a kind of power amplifier module proposed according to the present invention, it comprises the following steps: step one, and check before electricity, it comprises: a) outward appearance of macroscopic examination power amplifier modular circuit; B) resistance between each electrode of field effect transistor on multimeter measurement power amplifier module is utilized; C) according to the information that field effect transistor pipe cap marks, classifying and numbering is carried out to power amplifier module; D) power amplifier module is arranged in frock, and frock answer good earth; Step 2, static debugging, it comprises: the grid resistance over the ground a) measuring field effect transistor on power amplifier module; B) voltage of power supply is down to about 5V, is added on power amplifier module; C) voltage of power supply is made to slowly rise to load voltage value; D) make the grid voltage of field effect transistor on power amplifier module increase, meanwhile should be able to occur response gain curve on the screen of the sweep generator be connected with power amplifier module, observing this response gain curve has without exception or concussion; After this response gain curve of confirmation is correct; slowly boosting makes the working current of power amplifier module reach predetermined value again; measure the grid voltage of field effect transistor on now power amplifier module, and record the data (now claiming the electric current and voltage value of grid to be quiescent point) of grid voltage; E) power amplifier module is carried out to the test adjustment of frequency response; Step 3, dynamic debugging, it comprises: a) at the input end access prime power amplifier of power amplifier module, connect load at the output terminal of power amplifier module; B) to power amplifier module access power supply; C) power-on is powered, and the quiescent point of checking power amplifier module, just can carry out next step after correct; D) prime power amplifier is opened, increase the power stage of power amplifier module gradually, take into account by frequency spectrograph, power performance index and the data that power amplifier module observed by waveform monitor, expire the output power of power amplifier module to ratings in the performance index and the normal pusher of data confirming power amplifier module; E) power amplifier module full power state about 1 to 2 minutes are maintained, after power amplifier module is in stable condition, the performance index being taken into account waveform monitor observation power amplifier module by frequency spectrograph, power have unchanged, after confirming that the performance index of power amplifier module are substantially constant, record the moment performance index of now power amplifier module; F) the performance index data of recorded power amplifier module and normal data are compared, consistent or both difference of both confirmations is in normal range; G) the performance index data of recorded power amplifier module are filled up in data form; Step 4, electric Final finishing assembly, arranges recorded data, and carries out assembly according to technical requirement to power amplifier module according to reduced data.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The adjustment method of aforesaid power amplifier module, wherein before described electricity in checking process, the outward appearance of the macroscopic examination power amplifier modular circuit of step a) comprises: check whether the printed board of power amplifier module has flaw; Check that whether the position of the components and parts of power amplifier module is correct, whether have and lack weldering, solder skip, rosin joint; Check that whether the ground connection of the field effect transistor on power amplifier module is good; The information in step c), field effect transistor pipe cap marked comprises: its model, lot number, classification and enlargement factor; Frock in step d) is a kind of device being convenient to power amplifier module heat radiation, and described in the process of described static debugging and described dynamic debugging, power amplifier module is all installed in this frock.
The adjustment method of aforesaid power amplifier module, wherein in described static debugging process, step a) is by the gate bias potentiometer in feed circuit on regulatory work amplification module, make described gate bias potentiometer be in minimum value, measures the grid resistance over the ground of field effect transistor, the circuit that step b) will be powered to power amplifier module at power supply is provided with sampler, after step d) confirms that this response gain curve is correct, the voltage by measuring in described sampler on the sample resistance that is series on circuit that power supply powers to power amplifier module, obtain a magnitude of voltage, and according to the resistance value of known described sample resistance, utilize formula " electric current=voltage/resistance ", calculate the working current of power amplifier module, make the voltage of power supply slowly rise in the process of load voltage value in step c), need the voltage of the regulator block output terminal on repeated measurement power amplifier module in feed circuit, along with the rising of supply voltage, the voltage of regulator block output terminal can tend towards stability, and now the voltage of the grid of field effect transistor should be minimum value, step d) makes the grid voltage increase of field effect transistor on power amplifier module be by regulating described gate bias potentiometer, making grid voltage be increased by minimum value, after the screen of step d) sweep generator occurs response gain curve, when observing this response gain curve and having abnormal or concussion, the increase of grid voltage should be stopped at once, check the circuit of power amplifier module, find out fault, and cut off the electricity supply, fix a breakdown, after failture evacuation, then re-power, carry out step d), it is in the step a) through described static debugging that the test of the frequency response of step e) regulates, b), after the quiescent point of c) and d) modulated good power amplifier module, described sweep generator should be able to occur a correct response gain curve, observe the response gain curve now occurred, if when there is grave error and distortion, or when differing greatly with the frequency response curve of other power amplifier module of same batch, should at once to electricity under power amplifier module, check the circuit of power amplifier module, fair curve, repeat the step a) of described static debugging again, b), c), d) and e), observe response gain curve, until the response gain curve observed is little with the response gain curve difference of other power amplifier module of same batch, after correct, wherein, for the power amplifier module with variable capacitance, also need to regulate the variable capacitance in power amplifier modular circuit, make the gain bandwidth (GB) of power amplifier module best, Input matching is best, and unevenness is minimum.
The adjustment method of aforesaid power amplifier module, wherein in described dynamic debugging process, in step e) moment of recording now power amplifier module should power on the contrary step of step to electricity under power amplifier module according to described dynamic debugging after performance index; When the performance index data of recorded power amplifier module and normal data are compared by step f), if inconsistent or both difference is not in normal range both confirming, answer the place of problem analysis, and solve, then repeat the step a) of described dynamic debugging, b), c), d), e) and f).
The adjustment method of aforesaid power amplifier module, wherein in described static debugging process, carry out step d) and e) time to open cooling device for cooling power amplifier module; In described dynamic debugging process, carry out step c), d) and e) time to open cooling device for cooling power amplifier module.
The adjustment method of aforesaid power amplifier module, wherein in described dynamic debugging process, the circuit that described prime power amplifier is connected with the input end of described power amplifier module is provided with the first power meter; The circuit that the output terminal of described power amplifier module is connected with described load is provided with the second power successively and takes into account directional coupler, described frequency spectrograph is connected on described directional coupler, receives the output signal of described directional coupler; Receive the signal that described signal source exports after described prime power amplifier is connected to signal source, described waveform monitor is the output terminal being connected to described signal source, is used for monitoring the signal that described signal source exports.
The adjustment method of aforesaid power amplifier module, wherein said electric Final finishing assembly comprises: a) inserted by recorded data in the database designed on request; B) the concrete numerical value of required technical indicator is calculated; C) Data classification in all databases is arranged; D) according to carrying out assembly to power amplifier module the dividing of primary and secondary of technical requirement; E) secondary assembly is carried out according to the diverse location of power amplifier module power division and power combing in plug-in unit; F) numbering of power amplifier module good for assembly is gathered in writing, together give workshop together with power amplifier module and assemble.
The adjustment method of aforesaid power amplifier module, the quantity often criticizing power amplifier module to be debugged should be 120% to 130% of the standard number of the power amplifier module that design is wanted; Wherein the power amplifier module of 10% is as spare part, uses when facilitating user to keep in repair; The power amplifier module of 10% is as the replacer of waste product in power amplifier module debug process; The power amplifier module of 10% is as the optional amount of this batch of power amplifier module to be debugged when lower electric Final finishing assembly; Often criticizing after power amplifier module debugged, the power amplifier module that removing assembly is good and 10% is as the power amplifier module of spare part, and remaining power amplifier module is incorporated in the power amplifier module of next batch.
The adjustment method of aforesaid power amplifier module, must debug by partial node, each step can not reversed order or omission.
The adjustment method of aforesaid power amplifier module; also be provided with sampling protective device; in debug process; the situation of overcurrent can be run into; electric current is conference damage field effect transistor too; power amplifier module is even caused to damage; the circuit that power supply is powered to power amplifier module arranges the curent change that sampling protective device is convenient to also can measure at any time the while of protecting power amplifier module in time in circuit; when electric current exceedes predetermined limit value; fuse in sampling protective device disconnects; the power supply of power amplifier module is truncated, thus protection power amplifier module, avoid causing unnecessary loss.
The present invention compared with prior art has obvious advantage and beneficial effect.By technique scheme, the adjustment method of power amplifier module of the present invention at least has following advantages and beneficial effect: the adjustment method of power amplifier module of the present invention can be quick, accurately, and the debugging completing various power amplifier module of specification.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of instructions, and can become apparent to allow above and other object of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the composition structural representation of transmitter.
Fig. 2 is the composition structural representation of power amplifier.
Fig. 3 is the composition structural representation of power amplifier unit.
Fig. 4 is the process flow diagram of the adjustment method of power amplifier module of the present invention.
Fig. 5 is the schematic diagram of sampler of the present invention and sampling protective device.
Fig. 6 is that the present invention powers on the block scheme of equipment connection of static debugging.
Fig. 7 is the block scheme that the present invention pushes away the equipment connection of power dynamic debugging.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of adjustment method of power amplifier module proposed according to the present invention, method, step, feature and effect thereof, be described in detail as follows.
Aforementioned and other technology contents, Characteristic for the present invention, can know and present in the detailed description of following cooperation with reference to graphic preferred embodiment.By the explanation of embodiment, should to the present invention for the technological means reaching predetermined object and take and effect obtain one more deeply and concrete understanding, but institute's accompanying drawings is only to provide with reference to the use with explanation, is not used for being limited the present invention.
Refer to shown in Fig. 4, Fig. 5, Fig. 6 and Fig. 7, Fig. 4 is the process flow diagram of the adjustment method of power amplifier module of the present invention.Fig. 5 is the schematic diagram of sampler of the present invention and sampling protective device.Fig. 6 is that the present invention powers on the block scheme of equipment connection of static debugging.Fig. 7 is the block scheme that the present invention pushes away the equipment connection of power dynamic debugging.
The adjustment method of power amplifier module of the present invention mainly comprises the following steps:
Step one, checks before electricity, when producing in enormous quantities, due to batch power amplifier module from tens pieces to hundreds of block not etc., before powering on, therefore need to carry out sights inspection, measure, classification and arrangement. it mainly comprises:
A) outward appearance of macroscopic examination power amplifier modular circuit;
B) resistance between each electrode of field effect transistor on multimeter measurement power amplifier module is utilized;
C) according to field effect transistor pipe cap marks information classifying and numbering is carried out to power amplifier module;
D) power amplifier module is arranged in frock, and frock answer good earth.
Step 2, static debugging is by adding electric current required in technical indicator and voltage (technical indicator is at this moment also referred to as quiescent point) to power amplifier module 61, the correctness of Preliminary detection power amplifier module 61; The input end of power amplifier module 61 is received particular by the swept-frequency signal provided by sweep generator 63, after power amplifier module 61 amplifies, through wave detector 64, the signal after amplification is sent back to sweep generator 63 at the output terminal of power amplifier module 61, observe the static frequency response of power amplifier module 61; It mainly comprises:
A) the grid resistance over the ground of field effect transistor on power amplifier module 61 is measured;
B) voltage of power supply 62 is down to about 5V, is added on power amplifier module 61;
C) voltage of power supply 62 is made to slowly rise to load voltage value;
D) make the grid voltage of field effect transistor on power amplifier module 61 increase, meanwhile should be able to occur response gain curve on the screen of the sweep generator 63 be connected with power amplifier module 61, observing this response gain curve has without exception or concussion; After this response gain curve of confirmation is correct, more slowly boosting makes the working current of power amplifier module 61 reach predetermined value, measures the grid voltage of field effect transistor on now power amplifier module 61, and records the data of grid voltage;
E) power amplifier module 61 is carried out to the test adjustment of frequency response.
Step 3, dynamic debugging is that observe the data after its power amplification, it mainly comprises by inputting a Dynamic Signal to power amplifier module 73:
A) at the input end access prime power amplifier 72 of power amplifier module 73, load 75 is connected at the output terminal of power amplifier module 73;
B) power supply 77 is accessed to power amplifier module 73;
C) power-on 77 is powered, and the quiescent point of checking power amplifier module 73, just can carry out next step after correct;
D) prime power amplifier 72 is opened, increase the power stage of power amplifier module 73 gradually, performance index and the data of power amplifier module 73 are observed, in the output power of the full power amplifier module 73 of performance index and the normal pusher of data confirming power amplifier module 73 by frequency spectrograph 78, power meter (723,734) and waveform monitor 79;
E) power amplifier module 73 full power state about 1 to 2 minutes are maintained, after power amplifier module 73 is in stable condition, the performance index of being observed power amplifier module 73 by frequency spectrograph 78, power meter (723,734) and waveform monitor 79 have unchanged, after confirming that the performance index of power amplifier module 73 are substantially constant, record the moment performance index of now power amplifier module 73;
F) the performance index data of recorded power amplifier module 73 and normal data are compared, consistent or both difference of both confirmations is in normal range;
G) the performance index data of recorded power amplifier module 73 are filled up in data form.
Step 4, electric Final finishing assembly, arranges recorded data, and carries out assembly according to technical requirement to power amplifier module according to reduced data.
Wherein, before electricity in checking process, the outward appearance of the macroscopic examination power amplifier modular circuit of step a) comprises: check whether the printed board of power amplifier module has flaw; Check that whether the position of the components and parts of power amplifier module is correct, whether have and lack weldering, solder skip, rosin joint; Check that whether the ground connection of the field effect transistor of power amplifier module is good.Step b) must be carried out when ground connection is good.Step c) carries out classifying and numbering according to its pipe that field effect transistor pipe cap marks number, the relevant information such as lot number, classification and enlargement factor to power amplifier module.The power amplifier module by field effect transistor with identical markup information should divide at one group as far as possible and number in order, and carries out static debugging and dynamic debugging according to the order of grouping and the numbering in group.Frock in step d) is a kind of device being convenient to power amplifier module heat radiation, and in the process of static debugging and dynamic debugging, power amplifier module is all installed in this frock.
The adjustment method of power amplifier module of the present invention is in static debugging process, step a) is by the gate bias potentiometer in feed circuit on regulatory work amplification module 61, described gate bias potentiometer is made to be in minimum limit value, be generally 0 Ω, measure the grid resistance over the ground of field effect transistor, wherein the grid of this field effect transistor resistance is over the ground certain value.The circuit that step b) will power to power amplifier module 51 at power supply 52 is provided with sampler (as shown in Figure 5), after confirming that in step d) this response gain curve is correct, power supply 52 is series to the voltage on the sample resistance R on the circuit of power amplifier module 51 power supply by measuring in described sampler, obtain a magnitude of voltage, and according to the resistance value of known sample resistance R, utilize formula " electric current=voltage/resistance ", calculate the working current of power amplifier module.Make the voltage of power supply 62 slowly rise in the process of load voltage value in step c), need the voltage of the regulator block output terminal on repeated measurement power amplifier module 61 in feed circuit; Along with the rising of power supply 62 voltage, the voltage of regulator block output terminal can tend towards stability, and now the voltage of the grid of field effect transistor should be minimum value, is generally 0V.Step d) makes the grid voltage increase of field effect transistor on power amplifier module 61 be by regulating described gate bias potentiometer, making grid voltage be increased by minimum value.After the screen of step d) sweep generator 63 occurs response gain curve, when observing this response gain curve and having abnormal or concussion, should stop at once regulating described gate bias potentiometer, stop the increase of grid voltage, check the circuit of power amplifier module 61, find out fault, and cut off the electricity supply 62, fix a breakdown; After failture evacuation, then re-power, carry out step d).It is after the quiescent point through the step a) of static debugging, b), c) and d) modulated good power amplifier module 61 that the frequency sound test of step e) regulates, sweep generator 63 should be able to occur a correct response gain curve, observe the response gain curve now occurred.If when there is grave error or distortion, or differ greatly with the frequency response curve of other power amplifier module of same batch, should at once to power amplifier module 61 times electricity, check the circuit of power amplifier module 61, fair curve, then the step a), b), c), d) and e) repeating static debugging, observe frequency response curve, until the response gain curve observed is little with the response gain curve difference of other power amplifier module of same batch, after correct.Wherein, for the power amplifier module with variable capacitance, also need to regulate the variable capacitance in power amplifier modular circuit, make the gain bandwidth (GB) of power amplifier module best, Input matching is best, and unevenness is minimum.Frequency sound test adjustment is the final step of static debugging.So far static debugging just completes.Because different power amplifier modules has its distinctive amplifying circuit, although its circuit is different, their frequency sound test control method is roughly the same.It is the universal method that the frequency response of the power amplifier module that general reference is different regulates herein.
The adjustment method of power amplifier module of the present invention in dynamic debugging process, in step e) moment of recording now power amplifier module 73 should power on the contrary step of step to power amplifier module 73 times electricity according to dynamic debugging after performance index.When the performance index data of recorded power amplifier module 73 and normal data are compared by step f), if inconsistent or both difference is not in normal range both confirming, answer the place of problem analysis, and solve, then repeat the step a) of dynamic debugging, b), c), d), e) and f).
As shown in FIG. 6 and 7, the adjustment method of power amplifier module of the present invention in static debugging process, carry out step d) and e) time to open cooling device 65 for cooling power amplifier module 61.In dynamic debugging process, carry out step c), d) and e) time to open cooling device 76 for cooling power amplifier module 73.Wherein, cooling device 65,76 can be blower fan or cooled plate.
Please consult shown in Fig. 7, in dynamic debugging process, the circuit that prime power amplifier 72 is connected with the input end of power amplifier module 73 is being provided with the first power meter 723.The output terminal of power amplifier module 73 and the circuit of load 75 are provided with the second power meter 734 and directional coupler 74 successively, and frequency spectrograph 78 is connected on directional coupler 74, receives the output signal of directional coupler 74.Prime power amplifier 72 is connected to the signal that Received signal strength source 71 exports after signal source 71, and waveform monitor 79 is the output terminals being connected to signal source 71, is used for the signal that monitor signal source 71 exports.
The electric Final finishing assembly of the adjustment method of power amplifier module of the present invention mainly comprises: a) inserted by recorded data in the database designed on request; B) the concrete numerical value of required technical indicator is calculated; C) Data classification in all databases is arranged, such as according to pipe number, batch of field effect transistor and power amplifier module gain, electric current, efficiency, match and intermodulation etc.; D) according to carrying out assembly to power amplifier module the dividing of primary and secondary of technical requirement; E) secondary assembly is carried out according to the diverse location of power amplifier module power division and power combing in plug-in unit; F) numbering of power amplifier module good for assembly is gathered in writing, together give workshop together with power amplifier module and assemble.
Illustrating the quantity often criticizing power amplifier module to be debugged that will go into operation in the adjustment method of power amplifier module of the present invention should be 120% to 130% of the standard number of the power amplifier module that design is wanted; Wherein the power amplifier module of 10% is as spare part, uses when facilitating user to keep in repair; The power amplifier module of 10%, as the replacer of waste product in power amplifier module debug process, like this so that have substitute at any time when going wrong in debug process, is unlikely to delay production; The power amplifier module of 10% is as the optional amount of this batch of power amplifier module to be debugged when lower electric Final finishing assembly; Often criticizing after power amplifier module debugged, the power amplifier module that removing assembly is good and 10% is as the power amplifier module of spare part, and remaining power amplifier module is incorporated in the power amplifier module of next batch.
The adjustment method of power amplifier module of the present invention must be debugged by partial node (step), and each step can not reversed order or omission.Problem can be controlled the earliest like this, in minimum and the simplest situation, be convenient to solve.Such as, in static debugging, can not dynamic debugging be carried out when coupling or frequency response exception, otherwise such as concussion etc. can be produced, even can burn out field effect transistor and power amplifier module.
The adjustment method of power amplifier module of the present invention is also provided with sampling protective device (as shown in Figure 5), in debugging (static debugging and dynamic debugging) process, the situation of overcurrent can be run into, electric current crosses the field effect transistor on conference damage power amplifier module 51, power amplifier module 51 is even caused to damage, the circuit that power supply 52 powers to power amplifier module 51 arranges the curent change that sampling protective device is convenient to also can observe at any time the while of protecting power amplifier module 51 in time in circuit, when electric current exceedes predetermined limit value, fuse F in sampling protective device disconnects, the power supply of power amplifier module 51 is truncated, thus protection power amplifier module 51, avoid causing unnecessary loss.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. an adjustment method for power amplifier module, is characterized in that it comprises the following steps:
Step one, check before electricity, it comprises:
A) outward appearance of macroscopic examination power amplifier modular circuit;
B) resistance between each electrode of field effect transistor on multimeter measurement power amplifier module is utilized;
C) according to the information that field effect transistor pipe cap marks, classifying and numbering is carried out to power amplifier module;
D) power amplifier module is arranged in frock, and frock answer good earth;
Step 2, static debugging, it comprises:
A) the grid resistance over the ground of field effect transistor on power amplifier module is measured;
B) voltage of power supply is down to about 5V, is added on power amplifier module;
C) voltage of power supply is made to slowly rise to load voltage value;
D) make the grid voltage of field effect transistor on power amplifier module increase, meanwhile should be able to occur response gain curve on the screen of the sweep generator be connected with power amplifier module, observing this response gain curve has without exception or concussion; After this response gain curve of confirmation is correct, more slowly boosting makes the working current of power amplifier module reach predetermined value, measures the grid voltage of field effect transistor on now power amplifier module, and records the data of grid voltage, be quiescent point;
E) power amplifier module is carried out to the test adjustment of frequency response;
Step 3, dynamic debugging, it comprises:
A) at the input end access prime power amplifier of power amplifier module, load is connected at the output terminal of power amplifier module;
B) to power amplifier module access power supply;
C) power-on is powered, and the quiescent point of checking power amplifier module, just can carry out next step after correct;
D) prime power amplifier is opened, increase the power stage of power amplifier module gradually, take into account by frequency spectrograph, power performance index and the data that power amplifier module observed by waveform monitor, expire the output power of power amplifier module to ratings in the performance index and the normal pusher of data confirming power amplifier module;
E) power amplifier module full power state about 1 to 2 minutes are maintained, after power amplifier module is in stable condition, the performance index being taken into account waveform monitor observation power amplifier module by frequency spectrograph, power have unchanged, after confirming that the performance index of power amplifier module are substantially constant, record the moment performance index of now power amplifier module;
F) the performance index data of recorded power amplifier module and normal data are compared, consistent or both difference of both confirmations is in normal range;
G) the performance index data of recorded power amplifier module are filled up in data form;
Step 4, electric Final finishing assembly, arranges recorded data, and carries out assembly according to technical requirement to power amplifier module according to reduced data.
2. the adjustment method of power amplifier module according to claim 1, is characterized in that wherein before described electricity in checking process,
The outward appearance of the macroscopic examination power amplifier modular circuit of step a) comprises: check whether the printed board of power amplifier module has flaw; Check that whether the position of the components and parts of power amplifier module is correct, whether have and lack weldering, solder skip, rosin joint; Check that whether the ground connection of the field effect transistor of power amplifier module is good;
The information in step c), field effect transistor pipe cap marked comprises: its model, lot number, classification and enlargement factor;
Frock in step d) is a kind of device being convenient to power amplifier module heat radiation, and in the process of described static debugging and described dynamic debugging, power amplifier module is all installed in this frock.
3. the adjustment method of power amplifier module according to claim 1, is characterized in that wherein in described static debugging process,
Step a) is by the gate bias potentiometer in feed circuit on regulatory work amplification module, makes described gate bias potentiometer be in minimum value, measures the grid resistance over the ground of field effect transistor;
The circuit that step b) will be powered to power amplifier module at power supply is provided with sampler; After step d) confirms that this response gain curve is correct, the voltage by measuring in described sampler on the sample resistance that is series on circuit that power supply powers to power amplifier module, obtain a magnitude of voltage, and according to the resistance value of known described sample resistance, utilize formula " electric current=voltage/resistance ", calculate the working current of power amplifier module;
Make the voltage of power supply slowly rise in the process of load voltage value in step c), need the voltage of the regulator block output terminal on repeated measurement power amplifier module in feed circuit; Along with the rising of supply voltage, the voltage of regulator block output terminal can tend towards stability, and now the voltage of the grid of field effect transistor should be minimum value;
Step d) makes the grid voltage increase of field effect transistor on power amplifier module be by regulating described gate bias potentiometer, making grid voltage be increased by minimum value;
After the screen of step d) sweep generator occurs response gain curve, when observing this response gain curve and having abnormal or concussion, the increase of grid voltage should be stopped at once, check the circuit of power amplifier module, find out fault, and cut off the electricity supply, fix a breakdown; After failture evacuation, then re-power, carry out step d);
It is in the step a) through described static debugging that the test of the frequency response of step e) regulates, b), after the quiescent point of c) and d) modulated good power amplifier module, described sweep generator should be able to occur a correct response gain curve, observe the response gain curve now occurred, if when there is grave error and distortion, or when differing greatly with the frequency response curve of other power amplifier module of same batch, should at once to electricity under power amplifier module, check the circuit of power amplifier module, fair curve, repeat the step a) of described static debugging again, b), c), d) and e), observe response gain curve, until the response gain curve observed is little with the response gain curve difference of other power amplifier module of same batch, after correct, wherein, for the power amplifier module with variable capacitance, also need to regulate the variable capacitance in power amplifier modular circuit, make the gain bandwidth (GB) of power amplifier module best, Input matching is best, and unevenness is minimum.
4. the adjustment method of power amplifier module according to claim 3, is characterized in that in described dynamic debugging process,
In step e) moment of recording now power amplifier module should power on the contrary step of step to electricity under power amplifier module according to described dynamic debugging after performance index;
When the performance index data of recorded power amplifier module and normal data are compared by step f), if inconsistent or both difference is not in normal range both confirming, answer the place of problem analysis, and solve, then repeat the step a) of described dynamic debugging, b), c), d), e) and f).
5. the adjustment method of power amplifier module according to claim 4, is characterized in that wherein in described static debugging process, carry out step d) and e) time to open cooling device for cooling power amplifier module;
In described dynamic debugging process, carry out step c), d) and e) time to open cooling device for cooling power amplifier module.
6. the adjustment method of power amplifier module according to claim 5, is characterized in that wherein in described dynamic debugging process, and the circuit that described prime power amplifier is connected with the input end of described power amplifier module is provided with the first power meter; The circuit that the output terminal of described power amplifier module is connected with described load is provided with the second power successively and takes into account directional coupler, described frequency spectrograph is connected on described directional coupler, receives the output signal of described directional coupler; Receive the signal that described signal source exports after described prime power amplifier is connected to signal source, described waveform monitor is the output terminal being connected to described signal source, is used for monitoring the signal that described signal source exports.
7. the adjustment method of power amplifier module according to claim 6, is characterized in that wherein said electric Final finishing assembly comprises:
A) recorded data is inserted on request in the database designed;
B) the concrete numerical value of required technical indicator is calculated;
C) Data classification in all databases is arranged;
D) according to carrying out assembly to power amplifier module the dividing of primary and secondary of technical requirement;
E) secondary assembly is carried out according to the diverse location of power amplifier module power division and power combing in plug-in unit;
F) numbering of power amplifier module good for assembly is gathered in writing, together give workshop together with power amplifier module and assemble.
8. the adjustment method of power amplifier module according to claim 1, the quantity that it is characterized in that often criticizing power amplifier module to be debugged should be 120% to 130% of the standard number of the power amplifier module that design is wanted; Wherein the power amplifier module of 10% is as spare part, uses when facilitating user to keep in repair; The power amplifier module of 10% is as the replacer of waste product in power amplifier module debug process; The power amplifier module of 10% is as the optional amount of this batch of power amplifier module to be debugged when lower electric Final finishing assembly; Often criticizing after power amplifier module debugged, the power amplifier module that removing assembly is good and 10% is as the power amplifier module of spare part, and remaining power amplifier module is incorporated in the power amplifier module of next batch.
9. the adjustment method of power amplifier module according to claim 1, it is characterized in that it must be debugged by partial node, each step can not reversed order or omission.
10. the adjustment method of power amplifier module according to claim 1, it is characterized in that it is also provided with sampling protective device, in debug process, the situation of overcurrent can be run into, electric current is conference damage field effect transistor too, power amplifier module is even caused to damage, the circuit that power supply is powered to power amplifier module arranges the curent change that sampling protective device is convenient to also can observe at any time the while of protecting power amplifier module in time in circuit, when electric current exceedes predetermined limit value, fuse in sampling protective device disconnects, the power supply of power amplifier module is truncated, thus protection power amplifier module, avoid causing unnecessary loss.
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