CN104297537B - A kind of power amplifier grid voltage adjusting means and adjusting method - Google Patents
A kind of power amplifier grid voltage adjusting means and adjusting method Download PDFInfo
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- CN104297537B CN104297537B CN201410583192.3A CN201410583192A CN104297537B CN 104297537 B CN104297537 B CN 104297537B CN 201410583192 A CN201410583192 A CN 201410583192A CN 104297537 B CN104297537 B CN 104297537B
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- power supply
- grid voltage
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- source loads
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Abstract
The present invention relates to circuit testing technology field, discloses a kind of power amplifier grid voltage adjusting means and adjusting method, and described device includes external power supply and power source loads；, it is necessary to which the test board for carrying out power amplifier grid voltage regulation is in parallel with the power source loads, the initial current value that the power source loads provide is more than the current precision value of the external power supply for the external power supply and power source loads connection composition loop.The present invention is by parallel with the power source loads progress of external power supply by test board, the error for overcoming low noise current to bring influences, improve the degree of accuracy of power amplifier grid voltage regulation, the uniformity and accuracy of power amplifier regulation grid voltage under varying environment, different electrical power are ensure that, and then improves the degree of accuracy of power amplifier gain test.
Description
Technical field
The present invention relates to circuit testing technology field, more particularly to a kind of power amplifier grid voltage adjusting means and adjusting method.
Background technology
The test of power amplifier, it is necessary first to adjust grid voltage, suitable grid voltage is stored in EEPROM.Test gain
When, first load grid voltage, the specific yield value of re-test (TX, RX, OPD, RPD).When adjusting grid voltage, mainly by reading external electricity
What the current value in source determined.An initial voltage value is first put, then checks the current value of external power supply, if reached setting
Target current, if reaching, this initial voltage value is exactly the grid voltage for needing to set.If it is not reaching to, it is necessary to
Regulation voltage level, until electric current that external power supply is shown reaches the target current of needs.If the grid voltage adjusted is inaccurate, meeting
Test board gain test value is caused to deviate actual value.
Because test system (board), when just adding external power supply (such as 30V), a low noise current can be produced, such as
If the precision of fruit power supply is not high, this low noise current is read less than being then shown as 0mA or display is inaccurate, can cause reality
Target current it is inaccurate.Such as：The initial current that system (board) is brought by low noise is 15mA, target current 50mA, because
Not reaching for the precision of programmable power supply, when power-up, low noise current can not be shown, the low noise current for causing to read is 0mA,
Therefore, when target current is to 50mA, actually now real target current is 50mA-15mA=35mA；What we were adjusted
Grid voltage is the grid voltage that target current is 35mA in fact, and this has resulted in the inaccuracy of subsequent gain value.The precision of external power supply
It is whether good with the degree of accuracy, determine whether regulation grid voltage is accurate.Current power supplys many on the market, precision is inconsistent, can be to product
Test especially needs the product test of low current to cause very big influence.Moreover, because the precision problem of power supply, same board
Inconsistent, the yield value (TX, RX, OPD, RPD) for causing same board to be tested in varying environment in the grid voltage of varying environment regulation
Also it is inconsistent.
At present regulation grid voltage some use Agilent 5747A/5767A power supplys, the precision of this power supply is not
Height, precision 47.5mA.By concatenating grid voltage electric current and instrument read-out by universal meter between power supply and system (board)
The contrastive test of grid voltage electric current read-out by (5747A), as shown in figure 1, contrast test is found：This power supply specific precision with
Under (such as 40mA), read the low noise current less than system.When precision is critical, the actual current of reading can be inaccurate.In order to test
This species diversity is demonstrate,proved, concatenates High Precision Multimeter in circuit, the numerical value of power supply and universal meter can be read respectively, be shown in Table 1：
The circuit of table 1 concatenates universal meter, target grid voltage 65mA/65mA/315mA
Explanation：In table 1, actual current value is the target current that power amplifier board needs to reach；Actual current value=universal meter
Reading-low noise current (such as upper table, low noise current 14mA)；The power supply reading of actual current value=5747-low noise current is (as above
Table, low noise current 0mA)；From table 1 it follows that actual current differs 0mA~26mA.
And in actual test, low noise current is about 15mA or so, the minimum 50mA of target current, uses Agilent's
5747A/5767A power supplys, there is low noise current and read less than (being read as 0mA), the numerical value read during to target current is also inaccurate,
The grid voltage for causing same board varying environment to adjust is different, and yield value is also different；(power supply that varying environment uses is different)
The grid voltage and yield value that same board is adjusted in varying environment are as shown in table 2：
The grid voltage and yield value that 2 same board of table is adjusted in varying environment
It can be seen that, same board has 0mV~144mV difference, TX yield values in the grid voltage of varying environment from table 2
There are larger skew, 0.03dB~1.58dB.
Therefore, the method for existing regulation power amplifier grid voltage, the power amplifier grid voltage of regulation are not actual value, power amplifier gain
The value of test is not actual value, and the grid voltage of same board varying environment commissioning and the yield value of test are inconsistent.
The content of the invention
In order to improve power amplifier grid voltage regulation the degree of accuracy, improve power amplifier gain test the degree of accuracy, ensure varying environment,
The uniformity and accuracy of power amplifier regulation grid voltage under different electrical power, the invention provides a kind of power amplifier grid voltage adjusting means, the dress
Put including：External power supply and power source loads；
The external power supply and the power source loads connect into loop, it is necessary to carry out the test board of power amplifier grid voltage regulation with
The power source loads are in parallel, and the initial current value that the power source loads provide is more than the current precision value of the external power supply.
Preferably, the power source loads include circuit board and the multiple resistance being welded on the circuit board.
Preferably, the surface of the circuit board uses aluminium base.
Preferably, the reverse side of the circuit board is provided with the first fin.
Preferably, it is coated with heat-conducting silicone grease between the back side of the circuit board and the first fin.
Preferably, the solder side side of the circuit board is provided with the second fin.
Preferably, the multiple resistance of the welding on circuit boards are welded on the circuit board with parallel way.
Preferably, the external power supply is programmable power supply.
Preferably, the power source loads are placed in the test fixture equipped with fan.
The invention also provides a kind of method of the regulation power amplifier grid voltage applied to any of the above-described device, methods described includes
Following steps：
An initial voltage value is preset as power amplifier grid voltage, reads the current value of external power supply；
Whether the current value for judging the external power supply is target current value, if it is, the initial voltage value is to need
The grid voltage to be set, if it is not, then the initial voltage value is adjusted, until the current value of the external power supply reaches described
Target current value.
Preferably, the target current value is the current value of the power source loads and the setting electric current value of the test board
Sum.
The present invention proposes a kind of power amplifier grid voltage adjusting means and adjusting method, by by the electricity of test board and external power supply
Source load carry out it is in parallel, when power-up, current value that power supply is read far beyond external power supply current precision scope, gram
Taking the error that low noise current is brought influences, and improves the degree of accuracy of power amplifier grid voltage regulation, ensure that under varying environment, different electrical power
Power amplifier adjusts the uniformity and accuracy of grid voltage, and then improves the degree of accuracy of power amplifier gain test.
Brief description of the drawings
Fig. 1 is prior art by concatenating the power amplifier grid voltage contrastive test principle of universal meter between power supply and test board
Figure；
Fig. 2 is a kind of fundamental diagram of power amplifier grid voltage adjusting means of the present invention；
Fig. 3 is the pictorial diagram of the power source loads proposed in the present invention；
Fig. 4 is a kind of flow chart of power amplifier grid voltage adjusting method of the present invention.
Embodiment
With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
Embodiment 1
The embodiment of the present invention proposes a kind of power amplifier grid voltage adjusting means, as shown in Fig. 2 described device includes external power supply
And power source loads；
The external power supply connects composition loop with the power source loads, it is necessary to carry out the test board of power amplifier grid voltage regulation
In parallel with the power source loads, the initial current value that the power source loads provide is more than the current precision value of the external power supply.
Wherein, the external power supply is programmable power supply, and the current precision value of external power supply shows for the electric current of external power supply
Threshold value, when the electric current flowed through in the load of external power supply is less than above-mentioned threshold value, external power supply can not normally show that load provides
Electric current, when the electric current flowed through in the load of external power supply is much larger than above-mentioned threshold value and without departing from the current range of external power supply
When, the electric current that external power supply can be provided load is accurately shown.
The embodiment of the present invention present invention is explained, the present embodiment so that the magnitude of voltage of external power supply is 30V as an example
For illustrating the present invention, but the scope of the present invention is not limited to, different magnitudes of voltage can be chosen according to demand in actual applications
External power supply.By a power source loads in parallel between external power supply and test board, when power-up, read power supply
The initial current gone out is 600mA or so, and then overcomes and can not normally show that the error brought influences by low noise current, makes target electric
Stream can truly reach 50mA, improve the degree of accuracy of power amplifier grid voltage regulation, improve the accurate reading of power amplifier gain test, ensure that
The uniformity and accuracy of power amplifier regulation grid voltage under varying environment, different electrical power.
The power source loads proposed in the embodiment of the present invention have stability, accuracy, can practicality, and consider
Heat dispersion, effectively overcome influence of the temperature drift to resistance.
Wherein, the power source loads, as shown in figure 3, including circuit board and multiple resistance for being welded on the circuit board,
The multiple resistance of welding on circuit boards are welded on the circuit board with parallel way.
Wherein, the surface of the circuit board uses aluminium base.In the embodiment of the present invention in order to prevent temperature rise to resistance
Influence, the circuit board surface aluminium base of welding kesistance, add radiating surface, good radiating effect can be reached.
Wherein, the reverse side of circuit board is provided with the first fin.
Wherein, it is coated with heat-conducting silicone grease between the back side of circuit board and the first fin.
Wherein, the solder side side of circuit board is provided with the second fin.
In embodiments of the present invention, after circuit board being welded, heat-conducting silicone grease is smeared behind circuit board, passes through leading for smearing
Hot silicone grease, circuit board is arranged on big fin i.e. the first fin, welding circuit board face side refills one piece of fin
That is the second fin, two sides all radiation fins, the effect of radiating is enhanced.
Wherein, the power source loads are placed in the test fixture equipped with fan.
In actual use, power source loads are placed on inside test fixture, it is preferable that and test fixture two sides is equipped with 4 fans,
The number of fan can be increased or decreased as needed and changes the installation site of fan, power source loads is operated in a temperature
The environment of relative constancy, temperature drift will not be caused because of the unexpected rise of temperature.
In order to test influence of the temperature drift to power source loads, We conducted test, allow power source loads always in running status,
Every the electric current that 3 minutes read a programmable power supply, with the temperature of temperature rifle reading power source loads, humid test such as table 3：
The power load temperature of table 3 is tested
| Time | Voltage | Current | Temperature | Resistant |
| 16：42 | 32.1 | 0.829 | 27 | 42.8 |
| 16：45 | 32.1 | 0.751 | 30 | 42.8 |
| 16：48 | 32.1 | 0.751 | 33 | 42.8 |
| 16：51 | 32.1 | 0.751 | 34 | 42.8 |
| 16：54 | 32.1 | 0.751 | 35 | 42.8 |
| 16：57 | 32.1 | 0.751 | 36 | 42.8 |
| 17：00 | 32.1 | 0.751 | 36 | 42.8 |
| 17：03 | 32.1 | 0.751 | 36.2 | 42.8 |
| 17：06 | 32.1 | 0.751 | 36.4 | 42.8 |
| 17：09 | 32.1 | 0.751 | 36.4 | 42.8 |
| 17：12 | 32.1 | 0.751 | 36.4 | 42.8 |
| 17：15 | 32.1 | 0.751 | 36.4 | 42.8 |
| 17：18 | 32.1 | 0.751 | 36.4 | 42.8 |
| 17：21 | 32.1 | 0.751 | 36.4 | 42.8 |
| 17：24 | 32.1 | 0.751 | 36.2 | 42.8 |
| 17：27 | 32.1 | 0.751 | 36.2 | 42.8 |
| 17：30 | 32.1 | 0.751 | 36.4 | 42.8 |
| 17：33 | 32.1 | 0.751 | 36.4 | 42.8 |
| 17：36 | 32.1 | 0.751 | 36.4 | 42.8 |
| 17：39 | 32.1 | 0.751 | 36.4 | 42.8 |
As can be seen from Table 3, power load temperature is constant, and electric current is constant.
The power source loads, which implement, to be easier, and simple to install, cost is low, and practicality is good, improves the stabilization of test
Property and uniformity.
It is as previously mentioned, for the not high power supply of precision, it can not read or read for smaller electric current and be inaccurate
Really, power amplifier grid voltage adjusting means provided by the invention, by increasing power source loads, the error of power supply is have modified, improves power supply
Precision.When adjusting grid voltage, target current is really achieved, has made the grid voltage of regulation more accurate, the yield value of test is more accurate
Really.
In order to verify the feasibility of this scheme, to be done experiment with same board in varying environment, test result shows,
Varying environment commissioning grid voltage is basically identical, and yield value difference is specific as follows in 0.1dB or so, test case：
1) the present embodiment test environment selects Agilent 5747A/5767A power supplys, and the precision of this power supply is not high, electricity
Stream accuracy value is 47.5mA, increases power source loads, concatenates High Precision Multimeter in circuit, reads external power supply and general-purpose respectively
The numerical value of table, as shown in table 4：
The bringing onto load of table 4, circuit concatenation universal meter, target grid voltage 65mA/65mA/315mA
| Universal meter (mA) | Actual current value (mA) | 5747(mA) | Actual current value (mA) |
| 14 | 302 | ||
| 338 | 324 | 626 | 324 |
| 287 | 273 | 574 | 272 |
| 312 | 298 | 600 | 298 |
| 44 | 30 | 332 | 30 |
| 60 | 46 | 347 | 45 |
| 79 | 65 | 367 | 65 |
| 72 | 58 | 358 | 56 |
As can be seen from Table 4, actual current is basically identical.
2) in the case of load-carrying, grid voltage and yield value that same board is adjusted in varying environment, as shown in table 5：
In the case of table 5 is load-carrying, grid voltage and yield value that same board is adjusted in varying environment
By table 5, it can be seen that, same board is basically identical in the grid voltage of varying environment, and TX yield value differences are in 0.1dB
Left and right.
Embodiment 2
The embodiment of the present invention proposes a kind of power amplifier grid voltage adjusting means, including external power supply and power source loads；It is described outer
Connecing power supply connection needs to carry out the test board of power amplifier grid voltage regulation, and the power source loads and the test board are connected in parallel on described
On external power supply, after the voltage of the external power supply is fixed, the initial current value that the power source loads provide is more than outside described
Connect the current precision value of power supply.
Power source loads reach the resistance of parallel connection by using the resistor coupled in parallel of 102 4.99k ohms in embodiments of the present invention
To about 50 ohm, if the voltage of test power amplifier is 30V, then the initial current that power source loads provide is about 600mA in theory.
Benefit one in parallel is in order to radiate, second, in order to improve the stability of power source loads.Accounted for for radiating,
Power source loads increase resistance quantity by parallel connection in the embodiment of the present invention, disperse the heat dissipation capacity of each resistance.
Embodiment 3
The embodiment of the present invention proposes a kind of method of the regulation power amplifier grid voltage applied to said apparatus, as shown in figure 4, its
It is characterised by, the described method comprises the following steps：
S401, an initial voltage value is preset as power amplifier grid voltage, reads the current value of external power supply；
S402, whether the current value for judging the external power supply is target current value, if it is, step S403 is performed,
If it is not, then perform step S404.
Step S403, the grid voltage that the initial voltage value is set for needs；
Step S404, the initial voltage value is adjusted, until the current value of the external power supply reaches the target current
Value.
Wherein, the target current value is the current value and the setting electric current value of the test board of the power source loads
With.
The scheme of the method for this regulation power amplifier grid voltage than before improves the accuracy of power amplifier grid voltage, improves power amplifier gain
The degree of accuracy of value, the uniformity of varying environment test is added, transformation is simple, easily realizes, cost is low.
The present invention proposes a kind of power amplifier grid voltage adjusting means and adjusting method, by external power supply and test board it
Between a power source loads in parallel, when power-up, the electric current that power supply is read overcomes far beyond the accuracy rating of external power supply
The error that low noise current is brought influences, and target current is truly reached desired value, improves the degree of accuracy of power amplifier grid voltage regulation,
The uniformity and accuracy of power amplifier regulation grid voltage under varying environment, different electrical power are ensure that, and then improves power amplifier gain test
The degree of accuracy.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module or stream in accompanying drawing
Journey is not necessarily implemented necessary to the present invention.
Embodiment of above is merely to illustrate the present invention, and not limitation of the present invention, about the common of technical field
Technical staff, without departing from the spirit and scope of the present invention, it can also make a variety of changes and modification, thus it is all
Equivalent technical scheme falls within scope of the invention, and scope of patent protection of the invention should be defined by the claims.
Claims (9)
1. a kind of power amplifier grid voltage adjusting means, it is characterised in that described device includes external power supply and power source loads；
The external power supply and power source loads connection composition loop are, it is necessary to carry out test board and the institute of power amplifier grid voltage regulation
Power source loads parallel connection is stated, the initial current value that the power source loads provide is much larger than the current precision value of the external power supply；
The power source loads include circuit board and the multiple resistance being welded on the circuit board；
The multiple resistance of the welding on circuit boards are welded on the circuit board with parallel way.
2. device as claimed in claim 1, it is characterised in that the surface of the circuit board uses aluminium base.
3. device as claimed in claim 1, it is characterised in that the reverse side of the circuit board is provided with the first radiating
Piece.
4. device as claimed in claim 3, it is characterised in that smeared between the back side of the circuit board and the first fin
There is heat-conducting silicone grease.
5. device as claimed in claim 1, it is characterised in that the solder side side of the circuit board is provided with the second radiating
Piece.
6. device as claimed in claim 1, it is characterised in that the external power supply is programmable power supply.
7. device as claimed in claim 1, it is characterised in that the power source loads are placed on the test fixture equipped with fan
In.
8. a kind of method of regulation power amplifier grid voltage applied to claim 1-7 any devices, it is characterised in that methods described bag
Include following steps：
An initial voltage value is preset as power amplifier grid voltage, reads the current value of external power supply；
Whether the current value for judging the external power supply is target current value, if it is, the initial voltage value sets for needs
The grid voltage put, if it is not, then the initial voltage value is adjusted, until the current value of the external power supply reaches the target
Current value.
9. method as claimed in claim 8, it is characterised in that the target current value for the power source loads current value with
The sum of the setting electric current value of the test board.
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| CN201410583192.3A CN104297537B (en) | 2014-10-27 | 2014-10-27 | A kind of power amplifier grid voltage adjusting means and adjusting method |
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| CN201410583192.3A CN104297537B (en) | 2014-10-27 | 2014-10-27 | A kind of power amplifier grid voltage adjusting means and adjusting method |
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| CN104297537B true CN104297537B (en) | 2018-03-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2762436Y (en) * | 2004-11-08 | 2006-03-01 | 京信通信系统（广州）有限公司 | High precision temp.-compensation device for stabilizing intermodulation performance of power amplifier |
| CN101216528B (en) * | 2008-01-15 | 2010-06-02 | 中国科学院上海微系统与信息技术研究所 | On-chip test method for microwave power amplifier chip and its test system |
| CN101876672B (en) * | 2009-12-15 | 2012-01-11 | 武汉虹信通信技术有限责任公司 | Device for quickly debugging and testing grid voltage of power amplification module and method thereof |
| US9379640B2 (en) * | 2011-06-23 | 2016-06-28 | The Board Of Trustees Of The University Of Illinois | Scalable single-stage differential power converter |
| CN103941172B (en) * | 2013-01-22 | 2016-12-28 | 中芯国际集成电路制造(上海)有限公司 | Semiconductor test apparatus and method of testing |
| CN103401517B (en) * | 2013-08-15 | 2016-08-31 | 杭州威力克通信系统有限公司 | Radio frequency power amplifier system |
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