CN105450183A - Temperature compensation method and device for linear power amplifier - Google Patents
Temperature compensation method and device for linear power amplifier Download PDFInfo
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- CN105450183A CN105450183A CN201410375197.7A CN201410375197A CN105450183A CN 105450183 A CN105450183 A CN 105450183A CN 201410375197 A CN201410375197 A CN 201410375197A CN 105450183 A CN105450183 A CN 105450183A
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Abstract
The invention relates to the technical field of electronic communication and especially relates to a temperature compensation method for a linear power amplifier. The method comprises: detecting the maximum transmitting power of each frequency point in a whole frequency band under a setting temperature and obtaining a transmitting power curve of the frequency band; determining offset values of maximum transmitting powers and target powers, wherein the maximum transmitting powers are corresponding to frequency points of a first type which indicate a change trend of the transmitting power curve in the frequency band; if a current transmitting frequency point is a frequency point of the first type, performing output power compensation to an RF transmitter chip on the basis of an offset value corresponding to the current transmitting frequency point and quitting; if a current transmitting frequency point is a frequency point between the frequency points of the first type, obtaining offset values corresponding to frequency points using linear interpolation, wherein the frequency points are between the adjacent frequency points of the first type; performing output power compensation to the RF transmitter chip on the basis of an offset value corresponding to the current transmitting frequency point and quitting. By use of the method, the number of channels needed in temperature compensation is reduced, and the transmitting power evenness of a cell phone in a whole frequency band is maintained.
Description
Technical field
The present invention relates to technical field of electronic communication, be specifically related to a kind of temperature compensation of linear power amplifier.
Background technology
With WCDMA (WidebandCodeDivisionMultipleAccess, Wideband Code Division Multiple Access (WCDMA)) be the G mobile communication of representative, for realizing wide-band modulation, multicarrier is applied, reduce adjacent-channel interference to meet the bit error rate requirement of communication system simultaneously, Base Transmitter pole linear index of power amplifier is required strict, general WCDMA mobile phone adopts linear power amplifier (PA, PowerAmplifier), due to linear power amplifier, power output is different at different ambient temperatures, gain can change along with the change of ambient temperature, transmitting power can raise along with temperature and decline, vice versa, if do not do temperature-compensating under high and low temperature environment, the power output of linear power amplifier will vary with temperature and occur larger fluctuation, even under high and low temperature environment not by 3GPP (3rdGenerationPartnershipProject, third generation partner program) scope that specifies, cause test case (case) failure.Therefore need to do the invariable of temperature-compensating guarantee mobile phone transmission power to linear power amplifier under different ambient temperatures.Namely the power loss brought due to linear power amplifier change in gain is compensated by the power of adjustment linear power amplifier input.
Temperature compensation conventional is at present syllogic (or n segmentation) penalty method, namely whole frequency band is divided into three sections or n section (n>=1), then remove the power compensating these sample channel respectively, all the other channels and with the same offset of its nearest sample channel.The major defect that prior art exists is the flatness that can not ensure whole frequency band internal power, the most closing to reality situation of the offset of that several channel that may only sample, and the offset of other channel always has certain error.
Summary of the invention
The object of the invention is to, a kind of temperature compensation of linear power amplifier is provided, solve above technical problem.
The present invention also aims to, a kind of temperature compensation means of linear power amplifier is provided, solve above technical problem.
Technical problem solved by the invention can realize by the following technical solutions:
A temperature compensation for linear power amplifier, is applied in the radio system with radio-frequency transmissions chip, it is characterized in that, comprise the following steps,
Step 1, detects the accessible maximum transmission power of each frequency in whole frequency band, and obtains the transmit power curve of frequency band under a design temperature;
Step 2, to determine in described frequency band the deviant of the maximum transmission power that one group of first kind frequency identifying described transmit power curve variation tendency is corresponding and target power; When current transmitting frequency is not described first kind frequency, perform step 4;
Step 3, as current transmitting frequency be as described in first kind frequency, then compensate according to the deviant radio frequency transmitting chip power output that current transmitting frequency is corresponding and exit;
Step 4, as current transmitting frequency be as described in frequency between first kind frequency, the position corresponding in described transmit power curve according to described first kind frequency, obtains deviant corresponding to frequency between adjacent described first kind frequency with linear interpolation;
Step 5, the deviant radio frequency transmitting chip power output corresponding according to current transmitting frequency compensates and exits.
The temperature compensation of linear power amplifier of the present invention, the concrete grammar of described step 4 is as follows:
Step 41, connects with straightway adjacent described first kind frequency;
Step 42, the maximum transmission power of the first kind frequency that the end points according to each section of straightway two ends is corresponding and correspondence calculates the slope of each section of straightway;
Step 43, the maximum transmission power of the frequency between the described first kind frequency adopting following formulae discovery adjacent:
Y=k*x+b, wherein:
Y is the maximum transmission power that described frequency is corresponding;
K is the slope that each section of straightway is corresponding;
X is value of frequency point;
B is constant, equals the maximum transmit power value that the first kind frequency of each section of straightway initiating terminal is corresponding.
Step 44, the maximum transmission power calculated according to step 43 calculates the deviant with target power.
The temperature compensation of linear power amplifier of the present invention, the span of described design temperature is-20 DEG C ~ 65 DEG C.
The present invention also provides a kind of temperature compensation means of linear power amplifier, wherein, for implementing the temperature compensation of above-mentioned linear power amplifier, comprises,
One power detecting unit, in order to obtain the maximum transmission power that in whole frequency band, each frequency is corresponding;
One transmit power curve generation unit, in order to generate transmit power curve according to described maximum transmission power;
One first kind frequency computing unit, in order to determine in described frequency band one group of first kind frequency identifying described transmitted power plots changes;
One first deviant computing unit, in order to determine the deviant of the maximum transmission power that described first kind frequency is corresponding and target power;
One second deviant computing unit, in order to obtain the deviant of frequency between adjacent described first kind frequency and target power according to linear interpolation;
One compensating unit, in order to compensate according to described deviant radio frequency transmitting chip power output.
The temperature compensation means of linear power amplifier of the present invention, also comprises a straightway generation unit, connects with straightway adjacent described first kind frequency.
The temperature compensation means of linear power amplifier of the present invention, also comprises a slope calculation unit SCU, calculates the slope of each section of straightway according to the first kind frequency at each section of straightway two ends and the maximum transmission power of correspondence.
The temperature compensation means of linear power amplifier of the present invention, also comprises a memory cell, in order to store the maximum transmission power of each frequency and correspondence and/or described target power and/or described deviant.Beneficial effect: owing to adopting above technical scheme, the present invention proposes a kind of temperature compensation based on linear interpolation method newly, thus ensures that linear power amplifier transmitting power is at different ambient temperatures consistent; Decrease the channel number needed for temperature-compensating on the one hand, also can remain on the flatness of mobile phone transmission power in whole frequency band on the other hand.
Accompanying drawing explanation
Fig. 1 is method flow schematic diagram of the present invention;
Fig. 2 is the method flow schematic diagram of step 4 of the present invention;
Fig. 3 is transmit power curve of the present invention and the straightway schematic diagram after connecting.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
With reference to Fig. 1, a kind of temperature compensation of linear power amplifier, wherein, comprises the following steps,
Step 1, detects the accessible maximum transmission power of each frequency in whole frequency band, and obtains the transmit power curve of frequency band under a design temperature;
Step 2, determines the deviant of the maximum transmission power that the first kind frequency of one group of identification transmissions power curve variation tendency in frequency band is corresponding and target power; Whether be first kind frequency according to current transmitting frequency, perform step 3 or step 4;
Step 3, if current transmitting frequency is first kind frequency, then compensates according to the deviant radio frequency transmitting chip power output that current transmitting frequency is corresponding and exits;
Step 4, if current transmitting frequency is the frequency between first kind frequency, the position corresponding in transmit power curve according to first kind frequency, obtains deviant corresponding to frequency between adjacent first kind frequency with linear interpolation;
Step 5, the deviant radio frequency transmitting chip power output corresponding according to current transmitting frequency compensates.
First the present invention needs the maximum transmission power of all channels entirely swept under a design temperature in whole frequency band, obtains the transmit power curve of frequency band, understands the fluctuation situation of frequency band internal power; Secondly, determine the first kind frequency of one group of identification transmissions power curve variation tendency in frequency band, calculate the deviant of maximum transmission power corresponding to first kind frequency and target power, when current transmitting frequency is first kind frequency, the deviant radio frequency transmitting chip power output corresponding according to current transmitting frequency compensates and exits; When current transmitting frequency is the frequency between first kind frequency, the position corresponding in transmit power curve according to first kind frequency, obtain deviant corresponding to frequency between adjacent first kind frequency with linear interpolation, the basis of the measurements and calculations above completes the temperature-compensating of all channels.Above-mentioned calculating can utilize digital signal processing algorithm or special digital signal processing chip to carry out.
As a kind of preferred embodiment of the present invention, with reference to Fig. 2, the concrete grammar of step 4 is as follows:
Step 41, connects with straightway adjacent first kind frequency;
Step 42, the maximum transmission power of the first kind frequency that the end points according to each section of straightway two ends is corresponding and correspondence calculates the slope of each section of straightway;
Step 43, the maximum transmission power of the frequency between the described first kind frequency adopting following formulae discovery adjacent: y=k*x+b, wherein:
Y is the maximum transmission power that described frequency is corresponding;
K is the slope that each section of straightway is corresponding;
X is value of frequency point;
B is constant, equals the maximum transmit power value that the first kind frequency of each section of straightway initiating terminal is corresponding; Step 44, the maximum transmission power calculated according to step 43 calculates the deviant with target power.
Two end points of each section of straightway are crest and the trough point of this interval range respectively, and the maximum transmission power of the first kind frequency that the end points according to each section of straightway two ends is corresponding and correspondence calculates the slope of each section of straightway; Above-mentioned formula describes out the maximum transmission power of each frequency, be easy to calculate the deviant with target power according to maximum transmission power, make not need each frequency to calculate deviant Delta, just call this formula when reality uses, although make a frequency range have a lot of frequency, but in fact only need to find out wherein several frequency having feature, the maximum transmission power that namely first kind frequency is corresponding, just can obtain the deviant Delta of other all frequency with these end points.
As shown in Figure 3, abscissa is frequency, and ordinate is transmitting power, and illustrated in Fig. 3 that three sections of straightways are represented by dashed line, the end points of every section of straightway and the deviant of target power are easy to draw, use Delta1 respectively, Delta2, Delta3, Delta4 represent;
As a kind of preferred embodiment of the present invention, the span of design temperature is-20 ~ 65 DEG C.The curve shown in Fig. 3 can be obtained at interval of 10 DEG C of tests, the accuracy of temperature-compensating under guarantee different temperatures, such as, if target power P1=23dBm, at high or low temperatures due to the temperature effect of linear power amplifier, the power output of mobile phone can vary with temperature and decline or raise and depart from target power P1, Figure 3 shows that temperature raises the example of rear power output decline, so just need the change being carried out compensation power by temperature-compensating, i.e. compensation offset value Delta, thus the transmitting power of mobile phone is all consistent all the time under guarantee different temperatures, this is also the requirement in order to meet 3GPP.
The present invention also provides a kind of temperature compensation means of linear power amplifier, wherein, comprises,
One power detecting unit, in order to obtain the maximum transmission power that in whole frequency band, each frequency is corresponding;
One transmit power curve generation unit, in order to generate transmit power curve according to maximum transmission power;
One first kind frequency computing unit, in order to determine the first kind frequency of one group of mark transmitted power plots changes in frequency band;
One first deviant computing unit, in order to determine the deviant of the maximum transmission power that first kind frequency is corresponding and target power;
One second deviant computing unit, in order to obtain the deviant of frequency between adjacent first kind frequency and target power according to linear interpolation;
One compensating unit, in order to compensate according to deviant radio frequency transmitting chip power output.
As a kind of preferred embodiment of the present invention, also comprise a straightway generation unit, adjacent first kind frequency is connected with straightway.
As a kind of preferred embodiment of the present invention, also comprise a slope calculation unit SCU, calculate the slope of each section of straightway according to the first kind frequency at each section of straightway two ends and the maximum transmission power of correspondence.
As a kind of preferred embodiment of the present invention, also comprise a memory cell, in order to store the maximum transmission power of each frequency and correspondence and/or target power and/or deviant.
Due to the thermal effect of semiconductor device, the gain of linear power amplifier can change along with the change of ambient temperature, therefore needs to compensate by the power of adjustment linear power amplifier input the power loss brought due to linear power amplifier change in gain.The present invention is based on the temperature compensation of linear interpolation method, ensure that linear power amplifier transmitting power is at different ambient temperatures consistent; Decrease the channel number needed for temperature-compensating on the one hand, also can remain on the flatness of mobile phone transmission power in whole frequency band on the other hand.
These are only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilizations specification of the present invention and diagramatic content and apparent change obtain in protection scope of the present invention.
Claims (7)
1. a temperature compensation for linear power amplifier, is applied in the radio system with radio-frequency transmissions chip, it is characterized in that, comprise the following steps,
Step 1, detects the accessible maximum transmission power of each frequency in whole frequency band, and obtains the transmit power curve of frequency band under a design temperature;
Step 2, to determine in described frequency band the deviant of the maximum transmission power that one group of first kind frequency identifying described transmit power curve variation tendency is corresponding and target power; When current transmitting frequency is not described first kind frequency, perform step 4;
Step 3, as current transmitting frequency be as described in first kind frequency, then compensate according to the deviant radio frequency transmitting chip power output that current transmitting frequency is corresponding and exit;
Step 4, as current transmitting frequency be as described in frequency between first kind frequency, the position corresponding in described transmit power curve according to described first kind frequency, obtains deviant corresponding to frequency between adjacent described first kind frequency with linear interpolation;
Step 5, the deviant radio frequency transmitting chip power output corresponding according to current transmitting frequency compensates and exits.
2. the temperature compensation of a kind of linear power amplifier according to claim 1, is characterized in that, the concrete grammar of described step 4 is as follows:
Step 41, connects with straightway adjacent described first kind frequency;
Step 42, the maximum transmission power of the first kind frequency that the end points according to each section of straightway two ends is corresponding and correspondence calculates the slope of each section of straightway;
Step 43, the maximum transmission power of the frequency between the described first kind frequency adopting following formulae discovery adjacent: y=k*x+b, wherein:
Y is the maximum transmission power that described frequency is corresponding;
K is the slope that each section of straightway is corresponding;
X is value of frequency point;
B is constant, equals the maximum transmit power value that the first kind frequency of each section of straightway initiating terminal is corresponding;
Step 44, the maximum transmission power calculated according to step 43 calculates the deviant with target power.
3. the temperature compensation of a kind of linear power amplifier according to claim 1, is characterized in that, the span of described design temperature is-20 DEG C ~ 65 DEG C.
4. a temperature compensation means for linear power amplifier, is characterized in that, for implementing the claims the temperature compensation of the linear power amplifier described in 1, comprises,
One power detecting unit, in order to obtain the maximum transmission power that in whole frequency band, each frequency is corresponding;
One transmit power curve generation unit, in order to generate transmit power curve according to described maximum transmission power;
One first kind frequency computing unit, in order to determine in described frequency band one group of first kind frequency identifying described transmitted power plots changes;
One first deviant computing unit, in order to determine the deviant of the maximum transmission power that described first kind frequency is corresponding and target power;
One second deviant computing unit, in order to obtain the deviant of frequency between adjacent described first kind frequency and target power according to linear interpolation;
One compensating unit, in order to compensate according to described deviant radio frequency transmitting chip power output.
5. the temperature compensation means of a kind of linear power amplifier according to claim 4, is characterized in that, also comprises a straightway generation unit, connects with straightway adjacent described first kind frequency.
6. a kind of linear power amplifier according to claim 5 temperature compensation means, it is characterized in that, also comprise a slope calculation unit SCU, calculate the slope of each section of straightway according to the first kind frequency at each section of straightway two ends and the maximum transmission power of correspondence.
7. a kind of linear power amplifier according to claim 4 temperature compensation means, it is characterized in that, also comprise a memory cell, in order to store the maximum transmission power of each frequency and correspondence and/or described target power and/or described deviant.
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| CN201410375197.7A CN105450183A (en) | 2014-07-31 | 2014-07-31 | Temperature compensation method and device for linear power amplifier |
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| CN201410375197.7A CN105450183A (en) | 2014-07-31 | 2014-07-31 | Temperature compensation method and device for linear power amplifier |
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Application publication date: 20160330 |