CN101603992B - Method for establishing output power comparison table of power amplifier - Google Patents
Method for establishing output power comparison table of power amplifier Download PDFInfo
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- CN101603992B CN101603992B CN200810111199XA CN200810111199A CN101603992B CN 101603992 B CN101603992 B CN 101603992B CN 200810111199X A CN200810111199X A CN 200810111199XA CN 200810111199 A CN200810111199 A CN 200810111199A CN 101603992 B CN101603992 B CN 101603992B
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Abstract
The invention provides a method for establishing an output power comparison table of a power amplifier, comprising the following steps: firstly, setting a trigger point (TP) for an input voltage value; obtaining measurement data from the input voltage value being zero to the trigger point (TP) in a point-to-point measurement way; setting a switching point (SP) for the input voltage value, wherein the value of the switching point (SP) is less than the trigger point (TP); then establishing a local characteristic curve for measurement data from the curve switching point (SP) to the trigger point (TP) by utilizing the input voltage value; then obtaining calculating data from the switching point (SP) of the input voltage value to a maximum figure input voltage value (MP) by utilizing the local characteristic curve; and finally, obtaining integral characteristics by utilizing a part of the measurement data and the calculating data. In the invention, the curve can be a straight line, thereby the output power comparison tabble of the power amplifier can be more accurately established under high power.
Description
Technical field
The present invention is relevant for a kind of method for building up of the power amplifier output power table of comparisons.
Background technology
The main function of power amplifier in the mobile phone (Power Amplifier) is with the amplification that transmits, and allows base station, a distant place can receive the output signal of mobile phone.Global mobile communication system/general grouping wireless service (GSM/GPRS) mobile phone and base station distance farthest can far reach 35 kilometers, and the power amplifier peak power output requires to be generally 30～35dBm.For capacity and the intercommunication operation that guarantees system, the gsm system specification to the precision of mobile phone transmitting power, flatness, and emission spectrum purity strict regulation is arranged, these require main standard in the GSM of ETSI (ETSI) 11.10 series specifications.
ETSI GSM 11.10 specification requirements, the mobile phone transmit signal power can not be too precipitous to rising and the decline of time, must be a slow process of easing up and falling that rises.Transmitting power-the time curve of each time slot (Time Slot) must be in certain bound, otherwise emission spectrum will produce other users and disturb or missed signal.When the power output standard of testing equipment (as mobile phone), must do the action of correction (Calibration) earlier to equipment.Influence " switching instantaneous power output frequency spectrum " is that the digital input voltage value (DAC Value) of power amplifier concerns power output (Output Power) in numerous correction parameters.
Referring to Fig. 1, be the digital input voltage value (DAC Value) of typical power amplifier and the characteristic curve schematic diagram of power output (Output Power), it is roughly a monotonically increasing functional digraph.Because the characteristic curve of each power amplifier is different along with process conditions, therefore need carry out characteristic correction test (Calibration Test) to each power amplifier, to set up the characteristic curve table of comparisons (Characteristics Lookup Table) for follow-up accurate operation control.
Known have following two kinds for the characteristic metering system of power amplifier:
1, trace-point method or be called point-to-point mensuration (Point by Point Measurement)
The method is that the characteristic of power amplifier is done point-to-point describing, and promptly the input voltage of its measurable range is done the test of multiple spot with fixed intervals, to measure corresponding output power.According to the specification of manufacturer suggestion, when the concerning of physical record input voltage and power output earlier the decision shot point (this input voltage value generally can be lower than the power output limit for TP, input voltage value TriggerPoint), to avoid influencing other measurement parameter.For example with gsm system, the equipment of power grade 4 (Power Class 4), maximum rated power output (Maximal Rated Output Power) is 33dBm.After measuring, next just produce input voltage value, the power output of measuring correspondingly again with fixed intervals with the input voltage value of shot point.The advantage of the method is for can accurately writing down the relation of input voltage and power output in measurable range; Shortcoming be since the input voltage value of shot point be set with its restriction, can't directly be set at peak, therefore can't measure thus the characteristic curve of the exportable maximum power of power amplifier, also be that measurable range is limited by shot point TP.(for example the performance number of shot point correspondence is 32.5dBm if this power output when the shot point correspondence is lower than maximum rated power output, and the specified maximum rated power output of equipment is 33dBm), the digital input voltage value of between and the relation of power output just are zone of ignorance, will cause using the switching instantaneous output frequency spectrum (ORFS-due toSwitching Transients) of the mobile phone of this power amplifier can't compliant.
2, curve-fitting method (Curve Fitting)
In the measurable range of power amplifier, peek measurement point of the method, and according to the parameter of measurement result coupling predetermined curve.When for example curve was straight line, parameter can be slope and initial point; When curve was quadratic function, parameter can be three corresponding coefficients.Moreover, disclosing 20070069813 in early days referring to United States Patent (USP), it uses the multinomial (Polynomial) of 5 parameters to set up model.The advantage of this curve-fitting method is that computational speed is very fast, and can estimate the data of power amplifier outside measurable range with extrapolation (Extrapolation); Shortcoming is because will do match to function, if can't obtain being fit to the function of power amplifier overall permanence, then partial section has than mistake, especially near maximum rated power output place.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method for building up of the power amplifier output power table of comparisons, to set up the integrity property of power amplifier input voltage value to power output.
For reaching above-mentioned purpose, the invention provides a kind of method for building up of the power amplifier output power table of comparisons, at first input voltage value is set shot point (TP); Then by point-to-point metering system, obtaining input voltage value is 0 measurement data to shot point (TP); And to input voltage value setting switching point (SP), it is worth less than this shot point (TP); Utilize input voltage value to set up the local characteristics curve to the measurement data of shot point (TP) subsequently for switching point (SP); Utilize this local characteristics curve to obtain the calculated data of input voltage switching point (SP) then to maximum number input voltage value (MP); Can obtain this integrity property by this measurement data of part and this calculated data at last.In the present invention, this curve can be straight line, therefore can set up the power output table of comparisons of power amplifier when high-power more accurately.
The present invention is directed to one of them test event, promptly switch instantaneous power output frequency spectrum, the model of utilization between switching point and shot point, novel product line bearing calibration is proposed, to improve because the fabrication error of power amplifier own, cause operation of equipment when the power output limit, may not meet the situation of third generation partner program (3GPP) standard, and set up the integrity property of power amplifier input voltage value power output.
Description of drawings
Fig. 1 is the digital input voltage value (DAC Value) of typical power amplifier and the characteristic curve schematic diagram of power output (Output Power);
Fig. 2 A is the digital input voltage value of explanation power amplifier of the present invention and the characteristic curve schematic diagram of power output;
Fig. 2 B is the digital input voltage value of explanation power amplifier of the present invention and the characteristic curve schematic diagram of power output;
Fig. 3 is the flow chart of the method for building up of the power amplifier output power table of comparisons of the present invention;
Fig. 4 A utilizes known method to set up the switching instantaneous output spectrogram of power amplifier when being applied to mobile phone of the table of comparisons;
Fig. 4 B is respectively the switching instantaneous output spectrogram of power amplifier when being applied to mobile phone of setting up the table of comparisons according to the inventive method.
Description of reference numerals
Step S100, S102, S104, S106, S108
Embodiment
At first see also Fig. 2 A and Fig. 2 B, be the digital input voltage value of explanation power amplifier of the present invention and the characteristic curve schematic diagram of power output.According to method of the present invention, with the whole dynamic range (Dynamic Range) of power amplifier, also promptly the scope of the digital input voltage value shown in the figure (DAC Value) 0-16000 cuts into two intervals.These two intervals (first interval and second interval) are by a switching point (SP, Switch Point) defines (seeing aftermentioned for details), power amplifier feature measurement in first interval is measured by point-to-point method mode, accurately to learn the output input characteristics of power amplifier in this section interval.Leading portion part in second interval is also promptly carried out curve fitting to obtain local characteristics curve (Local Characteristic Curve) to the part of shot point (TP) data by point-to-point method by switching point (SP) in input.Then utilizing this local characteristics curve extrapolation to go out to remain dynamic range, also is shot point (TP) to maximum number input voltage value MP, Maximum Point) between characteristic.Because local characteristics curve and shot point (TP) are comparatively approaching to the unknown characteristics curved portion position between the maximum number input voltage value (MP), therefore can make extrapolation comparatively accurately by the local characteristics curve, and change the metering system that known curve-fitting method needs whole measurable range is set up curve model.
Again referring to Fig. 2 A and Fig. 2 B, because known point-to-point method only can obtain the data of measurable range (input voltage value is by 0 scope to shot point (TP)), therefore use the mobile phone of this power amplifier if the dynamic range measurable range outside (input voltage value by shot point (TP) to the scope the maximum number input voltage value (MP)) operate, just have the problem that switching instantaneous output frequency spectrum (ORFS-due toSwitching Transients) can't compliant.Known curve-fitting method is set up overall permanence curve (GlobalCharacteristic Curve) to whole measurable range (input voltage value is by 0 scope to shot point (TP)), because this overall permanence curve need take into account lower-powered part, can't accurately estimate the outer dynamic range of measurable range (input voltage value by shot point (TP) to the scope the maximum number input voltage value (MP)).Therefore the power amplifier table of comparisons that uses curve-fitting method to make still can make mobile phone in operand power during near limiting value, has to switch the problem that instantaneous output frequency spectrum (ORFS-due to Switching Transients) can't compliant.
According to the method for building up of the power amplifier output power table of comparisons of the present invention, earlier according to the earlier selected shot point (TP) (for example being digital input voltage value 14500) of the suggestion specification of power amplifier production firm.Then selected switching point (SP), choosing of switching point (SP) can deduct correction (Offset) again according to its lower limit at the statistical value of the power output of shot point correspondence of employed power amplifier, to guarantee an enough low value (being called power switched), again by measurement result decision switching point SP.Because the characteristic curve of each power amplifier is different along with process conditions, when using identical shot point (TP) (DAC=14500), have different power outputs (as 32.5dBm, 32.7dBm, 32.8dBm etc.), therefore can drive the statistical value lower limit (for example 32.5dBm) of trying to achieve power output at shot point (TP) to several same batch of power amplifier earlier, and deduct predetermined correction (for example 0.5dBm), the digital input voltage value when can select switching point (SP) to be output as 32dBm (power switched) for correspondence this moment (for example being digital input voltage value 11800).By utilizing switching point (SP) to set up the local characteristics curve to the point-to-point method measurement data of shot point (TP), more accurately extrapolation goes out the outer dynamic range of measurable range (input voltage value by shot point (TP) to the scope the maximum number input voltage value (MP)) data.
Referring to Fig. 3, be the flow chart of the method for building up of the power amplifier output power table of comparisons of the present invention.Execution in step S100 at first: can set shot point (TP) via the power amplifier manufacturer's recommendation, and obtain the data of input voltage value 0 to shot point (TP) (measurable range) by point-to-point mensuration.Execution in step S102 subsequently: according to power switched (lower limit of the statistical value of the power output of shot point correspondence deducts the result of correction again) and before point-to-point measurement data, the switching point (SP) that setting is littler than shot point (TP), execution in step S104 again: set up the local characteristics curve to the point-to-point measurement data of shot point (TP) by switching point (SP).Execution in step S106 subsequently: by this local characteristics curve calculation switching point (SP) to the data the maximum number input voltage value (MP), last execution in step S108: by 0 to the measurement data of switching point (SP) and switching point (SP) to the calculated data the maximum number input voltage value (MP), obtain whole input voltage and power output relation, to set up the power amplifier table of comparisons.In above-mentioned step S104, because power amplifier is when more high-power operation, its characteristic comparatively near linear, therefore can linear regression (Linear Regression) mode be set up characteristic curve.
In the method for building up of the power amplifier output power table of comparisons of above-mentioned explanation, because in the practical application (for example mobile phone), be to do reference columns when storing the table of comparisons, and input voltage value (DAC) is a respective column with fixing power step (Power Step); Therefore as the switching point foundation fixing switching condition can be arranged with power.For example, for following two kinds amplifiers 01 and amplifier 02, use power fixing reference conditions just to be arranged as foundation with different qualities.
Amplifier 01 amplifier 02
Power DAC power DAC
28 12000 28 11821
29 12500 29 12458
30 13000 30 13065
31 13500 31 13499
32 14000 32 14089
33 14500 33 14512
34 15000 34 15007
35 15500 35 15205
Fig. 4 A and Fig. 4 B are respectively and utilize known method to set up the table of comparisons and set up the power amplifier of the table of comparisons, the power spectrum of the instantaneous output of switching when being applied to mobile phone (ORFS-dueto Switching Transients) according to the inventive method.Therefore switching instantaneous output frequency spectrum shown in Fig. 4 A has bigger sideband (Side Band) owing to can't set up in powerful characteristic, does not meet standard.Switching instantaneous output frequency spectrum shown in Fig. 4 B is because employed power amplifier can accurately be based upon powerful characteristic, so its sideband is less, but compliant.
The above only is a preferred embodiment of the present invention, non-ly limits to claim of the present invention with this, so as long as the equivalence that utilization content of the present invention is done changes, all in like manner all be contained in the scope of the present invention.
Claims (6)
1. the method for building up of a power amplifier output power table of comparisons is set up the integrity property of power amplifier input voltage value to power output, it is characterized in that the method includes the steps of:
(a) input voltage value is set shot point;
(b) by point-to-point metering system, obtaining input voltage value is 0 measurement data to shot point;
(c) input voltage value is set switching point, it is worth less than this shot point;
(d) utilizing the middle input voltage value of step (b) is that switching point is set up the local characteristics curve to the measurement data of shot point; And
(e) utilize this local characteristics curve to obtain the calculated data of switching point to the maximum number input voltage value;
By this input voltage value is that 0 measurement data and this calculated data to switching point can obtain this integrity property.
2. the method for building up of the power amplifier output power table of comparisons as claimed in claim 1, it is characterized in that, described switching point is for deducting the power of correction by power amplifier again at the lower limit of the statistical value of the power output of shot point correspondence, and in refer step (b) measurement result power difference of corresponding aforementioned acquisition digital input voltage value and determine.
3. the method for building up of the power amplifier output power table of comparisons as claimed in claim 2 is characterized in that, described correction is 0.5dBm.
4. the method for building up of the power amplifier output power table of comparisons as claimed in claim 1 is characterized in that, the local characteristics curve of described step (d) is a straight line.
5. the method for building up of the power amplifier output power table of comparisons as claimed in claim 4 is characterized in that, described step (d) is undertaken by the linear regression mode.
6. the method for building up of the power amplifier output power table of comparisons as claimed in claim 1 is characterized in that, the maximum number input voltage value is 16000, and shot point is 14500.
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| CN200810111199XA CN101603992B (en) | 2008-06-12 | 2008-06-12 | Method for establishing output power comparison table of power amplifier |
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| CN101603992B true CN101603992B (en) | 2011-06-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107209510A (en) * | 2014-12-08 | 2017-09-26 | 罗伯特·博世有限公司 | Method for evident characteristics curve |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110658379B (en) * | 2019-10-09 | 2022-03-04 | 广东美的制冷设备有限公司 | Power detection method and device of reversing assembly, air conditioner and storage medium |
| CN111220897B (en) * | 2020-02-11 | 2022-01-21 | 南京派格测控科技有限公司 | Power calibration method, device and system and test system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6239657B1 (en) * | 1998-03-27 | 2001-05-29 | Rohde & Schwarz Gmbh & Co. Kg | Method and device for measuring the distortion of a high-frequency power amplifier and method and means for automatically equalizing a high-frequency power amplifier |
| US20020044014A1 (en) * | 1999-07-13 | 2002-04-18 | Wright Andrew S. | Amplifier measurement and modeling processes for use in generating predistortion parameters |
| US20020168023A1 (en) * | 1999-12-23 | 2002-11-14 | Marc Schrader | Transmitter for transmitting signals over radio channels and method for transmitting signals over radio channels |
| CN1218475C (en) * | 1999-10-26 | 2005-09-07 | 艾利森电话股份有限公司 | Adaptive linearization of power amplifiers |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6239657B1 (en) * | 1998-03-27 | 2001-05-29 | Rohde & Schwarz Gmbh & Co. Kg | Method and device for measuring the distortion of a high-frequency power amplifier and method and means for automatically equalizing a high-frequency power amplifier |
| US20020044014A1 (en) * | 1999-07-13 | 2002-04-18 | Wright Andrew S. | Amplifier measurement and modeling processes for use in generating predistortion parameters |
| CN1218475C (en) * | 1999-10-26 | 2005-09-07 | 艾利森电话股份有限公司 | Adaptive linearization of power amplifiers |
| US20020168023A1 (en) * | 1999-12-23 | 2002-11-14 | Marc Schrader | Transmitter for transmitting signals over radio channels and method for transmitting signals over radio channels |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107209510A (en) * | 2014-12-08 | 2017-09-26 | 罗伯特·博世有限公司 | Method for evident characteristics curve |
| CN107209510B (en) * | 2014-12-08 | 2020-07-28 | 罗伯特·博世有限公司 | Method for identifying a characteristic curve |
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