CN113267718A - Power amplifier testing method and device and computer readable storage medium - Google Patents
Power amplifier testing method and device and computer readable storage medium Download PDFInfo
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- CN113267718A CN113267718A CN202110810564.1A CN202110810564A CN113267718A CN 113267718 A CN113267718 A CN 113267718A CN 202110810564 A CN202110810564 A CN 202110810564A CN 113267718 A CN113267718 A CN 113267718A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
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Abstract
The invention discloses a test method and a test device of a power amplifier and a computer readable storage medium, wherein the theoretical third-order intermodulation coefficient of the power amplifier to be tested is calculated by comprehensively considering output signals of amplitude distortion and phase distortion, so that the theoretical horizontal and vertical coordinates of a third-order intermodulation intercept point of the power amplifier to be tested are obtained through the theoretical third-order intermodulation coefficient and signal gain, and accurate standard data are provided for actual test; meanwhile, the test signal is input into the power amplifier to be tested, so that the actual third-order intermodulation coefficient of the power amplifier can be obtained, and the actual horizontal and vertical coordinates of the third-order intermodulation intercept point of the power amplifier can be obtained through the actual third-order intermodulation coefficient and the signal gain; finally, the two are compared to obtain a nonlinear test result, namely the smaller the difference between the two is, the smaller the error of the test result is, the more accurate the result is, otherwise, the larger the error is, the more unreliable the test result is; through the design, the accuracy of the test result is improved.
Description
Technical Field
The invention belongs to the technical field of power amplifier testing, and particularly relates to a method and a device for testing a power amplifier and a computer readable storage medium.
Background
The power amplifier is widely applied to life and production and has the function of amplifying the power of signals, for example, in a sound system, because the sound signals just entering the sound system are small and cannot drive a loudspeaker to work, the power amplifier is required to amplify, so that the audio is played; for another example, a high-frequency power amplifier applied to a final stage of a signal transmitting end is used for performing power amplification on a high-frequency modulated wave signal to meet a requirement of transmission power, and then radiating the high-frequency modulated wave signal to a space through an antenna, so as to ensure that a receiver in a certain area can receive a satisfactory signal level and does not interfere with communication of an adjacent channel, and the high-frequency power amplifier is an important component of a transmitting device in a communication system.
With the development of modern wireless communication systems, information transmission is rapidly developing towards multi-carrier, large capacity and high speed, and the performance of a power amplifier, which is an important component of communication equipment, directly affects the communication quality; the power amplifier is in a large-signal state during operation due to performance requirements, and is inevitably subjected to nonlinear distortion in the amplification process, so that intersymbol interference among equipment is caused, and the error rate is increased; therefore, the non-linearity index of the power amplifier becomes one of important indexes for evaluating the performance of the power amplifier, and the detection accuracy directly determines the subsequent non-linearity compensation effect of the power amplifier; the existing power amplifier non-linearity test usually adopts manual test, i.e. inputting a signal into the power amplifier and reading test data to evaluate the linearity, and the method has large error and low accuracy and precision; therefore, how to realize accurate detection of the power amplifier becomes a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a method and a device for testing a power amplifier and a computer readable storage medium, which are used for solving the problem that the existing power amplifier has larger non-linearity testing error.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a test method of a power amplifier, which comprises the following steps:
acquiring a test signal based on an input-output characteristic function of a power amplifier to be tested, wherein the test signal comprises a dual-tone signal;
obtaining a test output signal of the test signal after passing through the power amplifier to be tested according to the input and output characteristic function;
carrying out amplitude-phase distortion fitting on the test output signal to obtain a nonlinear output signal of the power amplifier to be tested based on the amplitude-phase distortion;
obtaining a theoretical third-order intermodulation coefficient of the power amplifier to be tested according to the nonlinear output signal;
inputting the test signal into the power amplifier to be tested to obtain a practical third-order intermodulation coefficient of the power amplifier to be tested;
acquiring the signal gain of the power amplifier to be tested;
obtaining a theoretical horizontal and vertical coordinate of a third-order intermodulation interception point of the power amplifier to be tested according to the theoretical third-order intermodulation coefficient and the signal gain, and obtaining an actual horizontal and vertical coordinate of the third-order intermodulation interception point of the power amplifier to be tested according to the actual third-order intermodulation coefficient and the signal gain;
and obtaining a nonlinear test result of the power amplifier to be tested according to the theoretical horizontal and vertical coordinates and the actual horizontal and vertical coordinates of the three-order intermodulation intercept points.
Based on the disclosure, the invention firstly obtains the test output signal (which is equivalent to obtaining a theoretical output signal) after the test signal passes through the power amplifier to be tested through the input-output characteristic function of the test signal; then, carrying out amplitude-phase distortion fitting on the test output signal, namely comprehensively considering the amplitude-phase distortion and the phase distortion generated after the test signal is input into the power amplifier so as to obtain a nonlinear signal based on the amplitude-phase distortion; then, the nonlinear signal is used for calculating a theoretical third-order intermodulation coefficient of the power amplifier to be tested, so that a theoretical horizontal and vertical coordinate of a third-order intermodulation intercept point of the power amplifier to be tested is obtained by means of the theoretical third-order intermodulation coefficient and the signal gain of the power amplifier to be tested (the third-order intermodulation intercept point is an important index for evaluating the nonlinearity of the power amplifier, the linearity is better if the absolute value of the third-order intermodulation intercept point is larger, and the steps are equivalent to providing accurate standard data for actual measurement so as to compare the three-order intermodulation intercept points with the signal gain of the power amplifier to be tested); meanwhile, the invention also inputs the test signal into the power amplifier to be tested to obtain the test data thereof, thereby obtaining the actual third-order intermodulation coefficient, so as to obtain the actual horizontal and vertical coordinates of the third-order intermodulation intercept point through the actual third-order intermodulation coefficient and the signal gain; finally, a nonlinear test result can be obtained by comparing the two results, namely the smaller the difference between the two results is, the smaller the error of the test result is, the more accurate the result is, otherwise, the larger the error is, the more unreliable the test result is.
Through the design, the invention comprehensively considers the amplitude-phase distortion of the signal generated by the power amplifier to be tested, so that the accuracy of the calculated theoretical horizontal and vertical coordinates of the third-order intermodulation intercept point is greatly improved, and the accurate standard data is provided for the actual test; meanwhile, the error of the test result can be obtained by combining the actual horizontal and vertical coordinates of the tested three-order intermodulation intercept points and comparing the difference value of the two, so that whether the test result is reliable or not can be obtained, and the test accuracy is greatly improved.
In a possible design, obtaining a theoretical abscissa and ordinate of a third-order intermodulation intercept point of the power amplifier to be tested according to the theoretical third-order intermodulation coefficient and the signal gain includes:
acquiring the input power of the test signal;
obtaining a theoretical abscissa of the third-order intermodulation intercept point according to the input power and the theoretical third-order intermodulation coefficient;
and obtaining the theoretical ordinate of the third-order intermodulation intercept point according to the theoretical abscissa and the signal gain.
Based on the disclosure, the invention discloses a specific calculation method for calculating the theoretical abscissa and ordinate of the third-order intermodulation intercept point, namely, the theoretical abscissa is obtained by testing the input power of a signal and the theoretical third-order intermodulation coefficient; then, a theoretical ordinate is obtained from the theoretical abscissa and the signal gain.
In one possible design, obtaining a theoretical abscissa of the third-order intermodulation intercept point according to the input power and the theoretical third-order intermodulation coefficient includes:
dividing the theoretical third-order intermodulation coefficient by 2 to obtain a calculated value;
and summing the input power and the calculated value to obtain the theoretical abscissa of the third-order intermodulation interception point.
In one possible design, obtaining a theoretical ordinate of the third-order intermodulation intercept point according to the theoretical abscissa and the signal gain includes:
and summing the theoretical abscissa of the third-order intermodulation interception point and the signal gain to obtain the theoretical ordinate of the third-order intermodulation interception point.
Based on the disclosure of the two possible designs, the invention discloses a specific calculation formula of a theoretical abscissa and ordinate, namely, dividing a theoretical third-order intermodulation coefficient by 2, and then summing the result with input power to obtain the theoretical abscissa; and finally, adding signal gain to the theoretical abscissa to obtain the theoretical ordinate.
In one possible design, obtaining the signal gain of the power amplifier to be tested includes:
according to the test output signal and the test signal, obtaining the input power of the test signal and the fundamental wave power of the test output signal;
and obtaining the signal gain according to the input power and the fundamental wave power.
Based on the above disclosure, the present invention discloses a specific method for obtaining signal gain, that is, obtaining signal gain according to input power and fundamental power, and substantially dividing the fundamental power by the input power.
In one possible design, performing amplitude-phase distortion fitting on the test output signal to obtain a nonlinear output signal of the power amplifier to be tested based on the amplitude-phase distortion, including:
carrying out amplitude distortion fitting and phase distortion fitting on the test output signal to obtain an amplitude distortion output signal and a phase distortion output signal;
and obtaining the nonlinear output signal according to the amplitude distortion output signal and the phase distortion output signal.
Based on the disclosure, the invention respectively carries out amplitude distortion fitting and phase distortion fitting on the test signal, thereby obtaining an amplitude distortion output signal only considering the amplitude distortion and obtaining a phase distortion output signal only considering the phase distortion; finally, an output signal comprehensively considering the amplitude distortion and the phase distortion, namely a nonlinear output signal, can be obtained according to the two signals.
In one possible design, obtaining a theoretical third-order intermodulation coefficient of the power amplifier to be tested according to the nonlinear output signal includes:
substituting the nonlinear output signal into the phase distortion output signal to obtain a nonlinear distortion signal;
and obtaining the theoretical third-order intermodulation coefficient according to the nonlinear distortion signal.
In a second aspect, the present invention provides a testing apparatus for a power amplifier, including: the device comprises a first acquisition unit, an output signal generation unit, a distortion fitting unit, a third-order intermodulation coefficient calculation unit, a test unit, a second acquisition unit, a third-order intermodulation intercept point calculation unit and a comparison unit;
the first obtaining unit is used for obtaining a test signal based on an input-output characteristic function of a power amplifier to be tested, wherein the test signal comprises a dual-tone signal;
the output signal generating unit is used for obtaining a test output signal of the test signal after passing through the power amplifier to be tested according to the input and output characteristic function;
the distortion fitting unit is used for carrying out amplitude-phase distortion fitting on the test output signal to obtain a nonlinear output signal of the power amplifier to be tested based on the amplitude-phase distortion effect;
the third-order intermodulation coefficient calculation unit is used for obtaining a theoretical third-order intermodulation coefficient of the power amplifier to be tested according to the nonlinear output signal;
the test unit is used for inputting the test signal into the power amplifier to be tested so as to obtain the actual third-order intermodulation coefficient of the power amplifier to be tested;
the second obtaining unit is used for obtaining the signal gain of the power amplifier to be tested;
the third-order intermodulation intercept point calculation unit is used for obtaining a theoretical horizontal and vertical coordinate of the third-order intermodulation intercept point of the power amplifier to be tested according to the theoretical third-order intermodulation coefficient and the signal gain, and obtaining an actual horizontal and vertical coordinate of the third-order intermodulation intercept point of the power amplifier to be tested according to the actual third-order intermodulation coefficient and the signal gain;
and the comparison unit is used for obtaining a nonlinear test result of the power amplifier to be tested according to the theoretical horizontal and vertical coordinates and the actual horizontal and vertical coordinates of the three-order intermodulation intercept point.
In one possible design, the third-order intermodulation intercept calculation unit includes: the device comprises an input power acquisition subunit, an abscissa calculation subunit and an ordinate calculation subunit;
an input power obtaining subunit, configured to obtain input power of the test signal;
the abscissa calculating subunit is used for obtaining a theoretical abscissa of the third-order intermodulation intercept point according to the input power and the theoretical third-order intermodulation coefficient;
and the ordinate calculating subunit is used for obtaining the theoretical ordinate of the third-order intermodulation intercept point according to the theoretical abscissa and the signal gain.
In one possible design:
the abscissa calculating subunit is specifically configured to divide the theoretical third-order intermodulation coefficient by 2 to obtain a calculated value;
the abscissa calculating subunit is further specifically configured to sum the input power and the calculated value to obtain a theoretical abscissa of the third-order intermodulation intercept point.
In one possible design:
the ordinate calculating subunit is specifically configured to sum the theoretical abscissa of the third-order intermodulation intercept point and the signal gain to obtain the theoretical ordinate of the third-order intermodulation intercept point.
In one possible design:
the second obtaining unit is specifically configured to obtain the input power of the test signal and the fundamental power of the test output signal according to the test output signal and the test signal;
the second obtaining unit is further specifically configured to obtain the signal gain according to the input power and the fundamental power.
In one possible design:
the distortion fitting unit is specifically configured to perform amplitude distortion fitting and phase distortion fitting on the test output signal to obtain an amplitude distortion output signal and a phase distortion output signal;
the distortion fitting unit is further specifically configured to obtain the nonlinear output signal according to the amplitude distortion output signal and the phase distortion output signal.
In one possible design:
the third-order intermodulation coefficient calculation unit is specifically configured to substitute the nonlinear output signal into the phase distortion output signal to obtain a nonlinear distortion signal;
the third-order intermodulation coefficient calculation unit is further specifically configured to obtain the theoretical third-order intermodulation coefficient according to the nonlinear distortion signal.
In a third aspect, the present invention provides another testing apparatus for a power amplifier, taking an apparatus as a computer main device as an example, including a memory, a processor and a transceiver, which are sequentially connected in a communication manner, where the memory is used to store a computer program, the transceiver is used to transmit and receive messages, and the processor is used to read the computer program and execute a testing method for the power amplifier as described in the first aspect or any one of the possible designs of the first aspect.
In a fourth aspect, the present invention provides a computer-readable storage medium having stored thereon instructions which, when run on a computer, perform a method of testing the power amplifier as set forth in the first aspect or any one of the possible designs of the first aspect.
In a fifth aspect, the present invention provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform a method of testing the power amplifier as described in the first aspect or any one of the possible designs of the first aspect.
Drawings
Fig. 1 is a schematic flowchart illustrating steps of a method for testing a power amplifier according to the present invention;
FIG. 2 is a schematic diagram of a third-order intermodulation intercept point of a power amplifier to be tested according to the present invention;
fig. 3 is a schematic structural diagram of a testing apparatus for a power amplifier provided in the present invention;
fig. 4 is a schematic structural diagram of a computer main device provided in the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. This invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention.
It should be understood that, for the term "and/or" as may appear herein, it is merely an associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, B exists alone, and A and B exist at the same time; for the term "/and" as may appear herein, which describes another associative object relationship, it means that two relationships may exist, e.g., a/and B, may mean: a exists independently, and A and B exist independently; in addition, for the character "/" that may appear herein, it generally means that the former and latter associated objects are in an "or" relationship.
Examples
In the testing method for the power amplifier provided in the first aspect of this embodiment, the theoretical third-order intermodulation coefficient of the power amplifier to be tested is calculated by comprehensively considering the output signals (i.e., the nonlinear output signals) of the amplitude distortion and the phase distortion, so that the theoretical abscissa and ordinate of the third-order intermodulation intercept point of the power amplifier to be tested are obtained by the theoretical third-order intermodulation coefficient and the signal gain of the power amplifier to be tested, which is equivalent to providing accurate standard data for practical testing; meanwhile, the test signal is input into the power amplifier to be tested, so that the actual third-order intermodulation coefficient of the power amplifier to be tested can be obtained, and the actual horizontal and vertical coordinates of the third-order intermodulation intercept point of the power amplifier to be tested can be obtained through the actual third-order intermodulation coefficient and the signal gain; finally, the two are compared to obtain a nonlinear test result, namely the smaller the difference between the two is, the smaller the error of the test result is, the more accurate the result is, otherwise, the larger the error is, the more unreliable the test result is; through the design, the accuracy of the test result is improved.
As shown in fig. 1, the method for testing a power amplifier provided in the first aspect of this embodiment may include, but is not limited to, the following steps S101 to S108.
S101, acquiring a test signal based on an input-output characteristic function of a power amplifier to be tested, wherein the test signal comprises a dual-tone signal.
And S102, obtaining a test output signal of the test signal after passing through the power amplifier to be tested according to the input and output characteristic function.
Step S101 and step S102 are to obtain a theoretical output signal of the test signal after passing through the power amplifier to be tested by using the test signal input-output characteristic function, so as to provide a data basis for the subsequent calculation of the theoretical third-order intermodulation coefficient.
In the embodiment, the power amplifier to be tested is used as an unknown network, and then the nonlinear characteristic of the power amplifier to be tested is described by using a taylor series, namely, the relation between the output signal and the input signal of the power amplifier to be tested is characterized by using the following polynomial.
In the above-mentioned formula, the compound of formula,
and
input and output voltages containing amplitude and phase signals at both ends of the power amplifier, respectively
The coefficients of the various items are represented, and the value of the coefficients is related to the characteristics of the power amplifier matching circuit of the power amplifier to be tested and the transistor.
In this embodiment, the dual tone signal is generated by synthesizing two signals with the same power and the frequency difference much smaller than the carrier frequency, and the voltage of the dual tone signal is recorded as
Then the two-tone signal can be expressed as follows:
then, the two-tone signal is substituted into the input-output characteristic function, so as to obtain a theoretical output signal of the test signal after passing through the power amplifier to be tested, that is, the test output signal, which can be represented by, but is not limited to, the following equation:
and (3) expanding the first 3 terms of the above formula to obtain a final expression of the test output signal:
in the above-mentioned formula, the compound of formula,
in order to test the output signal(s),
which represents the time of day,
and
respectively representing the frequencies of two radio frequency signals in a two-tone signal,
is the voltage amplitude of the two-tone signal.
After the test output signal is obtained, amplitude-phase distortion fitting may be performed on the test output signal to obtain an output signal that comprehensively considers amplitude distortion and phase distortion, so as to make the theoretical third-order intermodulation coefficient obtained by subsequent calculation more accurate, as shown in step S103.
And S103, carrying out amplitude-phase distortion fitting on the test output signal to obtain a nonlinear output signal of the power amplifier to be tested based on the amplitude-phase distortion effect.
In the present embodiment, the magnitude-phase distortion fitting performed in the step S103 may include, but is not limited to, the following step S103a and step S103b.
S103a, carrying out amplitude distortion fitting and phase distortion fitting on the test output signal to obtain an amplitude distortion output signal and a phase distortion output signal.
And S103b, obtaining the nonlinear output signal according to the amplitude distortion output signal and the phase distortion output signal.
As can be seen from the two steps, the amplitude-phase distortion fitting in step S103 is essentially to perform amplitude distortion fitting and phase distortion fitting on the test output signal, that is, to obtain an amplitude distortion output signal only considering that the test signal only generates amplitude distortion in the power amplifier to be tested, and obtain a phase distortion output signal only considering that the test signal only generates phase distortion in the power amplifier to be tested; then, a nonlinear output signal can be obtained according to the phase distortion output signal and the amplitude distortion output signal.
In this embodiment, the amplitude distortion fitting to the test output signal can be, but is not limited to, obtained by the following method: and performing amplitude distortion fitting on the test output signal by using an odd power series function to obtain the amplitude distortion output signal.
I.e. in the aforesaid test output signal
On the basis of the odd power series function pair
To carry outDistortion fitting, which yields an amplitude-distorted output signal, as shown below:
in the above-mentioned formula, the compound of formula,
representing the magnitude-phase distorted output signal,
to do so
，
。
The above formula is sorted, and high-order small terms are ignored to obtain:
meanwhile, in order to simplify the above equation:
thus, the above formula
Can be simplified as follows:
from the foregoing, an output signal that takes into account only amplitude distortion, i.e., in equation (5), can be derived
This portion represents the amplitude, and
then the phase is represented.
Similarly, in this embodiment, the phase distortion fitting is performed on the test output signal, which may be, but is not limited to, performing the phase distortion fitting on the test output signal by using a power function model; the fitting of phase distortion by adopting a power function model is the most common fitting model of the phase distortion of the power amplifier; meanwhile, the fitting accuracy is related to the order of the power function model, so in this embodiment, the phase distortion fitting may be performed on the test output signal by using, but not limited to, a 4 th order power function model.
That is, in the present embodiment, the test output signal is subjected to a 4 th order power function model
Performing phase distortion fitting to obtain phase distortion output signal
。
In the above-mentioned formula (6),
then represents the amplitude, and
then it represents the phase of the signal,
is the phase offset at the peak power of the test signal.
Therefore, the signal is output by the phase distortion
And amplitude distortion output signal
An expression of the amplitude and phase in the output signal is obtained to form the nonlinear output signal, i.e. in the above equation (5)
Representing the amplitude in the above formula (6)
Representing the phase, and, hence, the non-linear output signal
Comprises the following steps:
after the nonlinear output signal is obtained, the theoretical third-order intermodulation coefficient of the power amplifier to be tested can be obtained according to the nonlinear output signal, as shown in the following step S104.
And S104, obtaining the theoretical third-order intermodulation coefficient of the power amplifier to be tested according to the nonlinear output signal.
In the present embodiment, the exemplary step S104 may include, but is not limited to, the following step S104a and step S104b.
And S104a, substituting the nonlinear output signal into the phase distortion output signal to obtain a nonlinear distortion signal.
And S104b, obtaining the theoretical third-order intermodulation coefficient according to the nonlinear distortion signal.
Step S104a is to output the nonlinear output signal
Is substituted into the phase-distorted output signal
Thereby obtaining a nonlinear distortion signal.
In this embodiment, before proceeding to step S104a, it is necessary to expand the phase distortion output signal for the subsequent substitution of the nonlinear output signal.
In the present embodiment, the phase distortion output signal
The deployment is performed as follows:
then, the mixture is mixed with
And
performing power series expansion, the following expression can be obtained:
as can be seen from the formula (8),
the first order intermodulation products representing the signal, i.e. in equation (8),
and the portion multiplied by it is used as the first-order intermodulation component; in the same way, the method for preparing the composite material,
and the portion multiplied by the third-order intermodulation component is used as the third-order intermodulation component; while
And the portion multiplied by the sum is used as the fifth-order intermodulation component.
Similarly, the following expression can be obtained by expanding the nonlinear output signal:
in the above-mentioned formula (9),
，
。
thus, the compound of formula (9) is neutralized
、
And
the terms multiplied by the phase points are sequentially substituted in formula (8), and high-order terms are omitted, so that a nonlinear distortion signal can be obtained, as shown in the following expression:
in the above-mentioned formula (10),
represents a nonlinear distortion signal, and is known from the combination of equation (8) and
the multiplied part is the third-order intermodulation component, therefore, the coefficient of the third-order intermodulation component in the formula (10) is
And
。
therefore, according to the calculation formula of the third-order intermodulation coefficient, the theoretical third-order intermodulation coefficient of the power amplifier to be tested is: the sum of the squares of the coefficients of the third-order intermodulation component, divided by the square of the coefficients of the first-order intermodulation component, is multiplied by 101lg (the coefficient is obtained according to the power of the power amplifier to be tested at a 1dB compression point, the 1dB compression point is an index for representing the linearity of the PA (power amplifier), normally, the PA is that the linear output power increases with the increase of the input power, when the PA enters a fast saturation region, the input power increases again, but the output power does not change, and the effect of the 1dB compression point is used for measuring the stability degree of the gain of the signal in the continuous change process) is expressed by the following formula:
therefore, through the steps S101-S104 and the substeps of each step, the theoretical third-order intermodulation coefficient of the power amplifier to be tested can be obtained according to the input and output characteristic function of the test signal.
After the theoretical third-order intermodulation coefficient is obtained, the test signal may be input into the power amplifier to be tested to obtain the actual third-order intermodulation coefficient of the power amplifier to be tested, as shown in the following step S105.
And S105, inputting the test signal into the power amplifier to be tested to obtain the actual third-order intermodulation coefficient of the power amplifier to be tested.
Step S105 is the actual testing process, in this embodiment, the actual third-order intermodulation coefficient of the power amplifier to be tested can be measured by using the spectrum analyzer, for example, the process is as follows:
step 1: connecting a signal source, a power amplifier to be tested and a frequency spectrograph (which can be but is not limited to an Agilent8560EC type frequency spectrograph), and setting the attenuation level of the frequency spectrograph to be 10db and the reference level to be 0 db; the frequency range is: 5MHz, center frequency: 901.5 MHz; of course, the frequencies of the two RF signals of the synthesized two-tone signal are 901MHz and 902 MHz.
Step 2: and adjusting the stabilized voltage power supply of the power amplifier to be tested, respectively turning on the signal source, and inputting a two-tone signal to the power amplifier to be tested.
And step 3: opening a spectrum analyzer, checking the frequency spectrums of fundamental wave signals and third-order intermodulation signals on the spectrum analyzer, simultaneously pressing PEAK SEARCH (peak search) keys on the spectrum analyzer, wherein at the moment, a MARKER point (cursor point) in the spectrum analyzer can search a peak point of the fundamental wave signals, then pressing MARKER DELTA keys (difference cursor key) for activating two cursors for measuring the frequency and power difference parameter test of the two frequency points, and then pressing a NEXT LIFT key or a NEXT RIGHT key (the specific key is determined according to the position of the MARKER point), at the moment, directly reading the actual third-order intermodulation coefficients of the power amplifier to be tested from the spectrum analyzer.
After the theoretical third-order intermodulation coefficient and the actual third-order intermodulation coefficient of the power amplifier to be tested are obtained, the theoretical third-order intermodulation intercept point and the actual third-order intermodulation intercept point of the power amplifier to be tested can be respectively calculated.
As shown in fig. 2, in an ideal linear system, as the input power of the test signal increases, the fundamental component and the third-order intermodulation component have an intersection point where the amplitudes of the input signals are the same, which is the third-order intermodulation intercept point; the intersection point is the intersection point of the extension lines of the two, so that the measurement cannot be directly carried out in the actual measurement; therefore, the point can be determined by calculating the abscissa and ordinate of the point.
As shown in fig. 2, in a practical system, since the power amplifier is a nonlinear device, the power of the output signal does not increase linearly with the input signal, and the third-order intermodulation component tends to increase faster than the fundamental component, and theoretically, the linear slope of the fundamental component is 1, the linear slope of the third-order intermodulation component is 3, and a 3-fold relationship is generally maintained between the slopes of the first-order intermodulation component and the third-order intermodulation component, so that the difference between the first-order intermodulation component and the third-order intermodulation component is the third-order intermodulation distortion, and therefore, the abscissa and the ordinate of the third-order intermodulation intercept point can be derived by the linear expression of the fundamental component and the linear expression of the third-order intermodulation component, as follows:
in the above-mentioned formula, the compound of formula,
and
respectively representing the abscissa and ordinate of the third-order intermodulation intercept point,
the coefficient of the mutual strip of the third order,
for the purpose of testing the input power of the signal,
for testing the output power of the signal, and
indicating work to be testedSignal gain of the rate amplifier.
The theoretical third-order intermodulation coefficient and the actual third-order intermodulation coefficient of the power amplifier to be tested are already obtained through the foregoing steps S104 and S105, and therefore, now only the signal gain and the input power of the power amplifier to be tested need to be obtained, and the actual abscissa and the theoretical ordinate of the third-order intermodulation point can be calculated, as shown in the following steps S106 and S107.
And S106, acquiring the signal gain of the power amplifier to be tested.
In this embodiment, the obtaining of the signal gain of the power amplifier to be tested may include, but is not limited to, the following steps S106a and S106b.
And S106a, obtaining the input power of the test signal and the fundamental wave power of the test output signal according to the test output signal and the test signal.
Since the expression of the test output signal has been derived in step S102, the input power as well as the fundamental power can be calculated from the amplitude modulation signal carrier voltage power calculation formula.
From the expression for the test output signal, the fundamental component is
And
the second order intermodulation component is
And
and the third order intermodulation component is
And
thus, can be derived from the test output signalAnd (6) extracting the coefficient of the fundamental component.
And according to the calculation formula of the carrier voltage power of the amplitude modulation signal:
in the formula (I), wherein,
coefficients representing components of the signal, and
it represents the total resistance of the power amplifier under test.
Therefore, according to the input expression of the two-tone signal, i.e. equation (2), the input power is known
。
As can be seen from equation (3), the coefficients of the fundamental component in the test output signal are:
thus, the fundamental power is:
。
after the fundamental power and the input power are obtained, the signal gain is obtained, as shown in the following step S106b.
And S106b, obtaining the signal gain according to the input power and the fundamental wave power.
In this embodiment, the exemplary signal gain is equal to the fundamental power divided by the input power, i.e., the signal gain
。
Therefore, after the signal gain is obtained, the theoretical third-order intermodulation coefficient and the actual third-order intermodulation coefficient can be combined to calculate the theoretical abscissa and the actual abscissa of the third-order intermodulation intercept point of the power amplifier to be tested, as shown in the following step S107.
And S107, obtaining a theoretical horizontal and vertical coordinate of the third-order intermodulation interception point of the power amplifier to be tested according to the theoretical third-order intermodulation coefficient and the signal gain, and obtaining an actual horizontal and vertical coordinate of the third-order intermodulation interception point of the power amplifier to be tested according to the actual third-order intermodulation coefficient and the signal gain.
Step S107 is a process of calculating the theoretical abscissa and the actual abscissa of the third-order intermodulation intercept point, that is, after obtaining the signal gain, the theoretical third-order intermodulation coefficient and the actual third-order intermodulation coefficient, the calculation can be directly performed according to the above equations (11) and (12).
After the actual abscissa and the theoretical abscissa of the third-order intermodulation point are calculated, the difference between the actual abscissa and the theoretical abscissa can be calculated to determine whether the test result is reliable, i.e., as shown in the following step S108.
And S108, obtaining a nonlinear test result of the power amplifier to be tested according to the theoretical horizontal and vertical coordinates and the actual horizontal and vertical coordinates of the three-order intermodulation intercept points.
In this embodiment, if the difference between the two is smaller, it is proved that the error of the test result is smaller, and the result is more accurate, otherwise, the error is larger, and the test result is more unreliable, that is, the error of the tested result is larger, at this time, a retest is required, or an average value is taken through a plurality of tests, and then comparison is performed.
In the present embodiment, the ordinate, i.e. the output power, of the two can be directly compared, and as can be seen from fig. 2, the larger the output power is, the better the linearity of the power amplifier to be tested is; the smaller the difference value of the vertical coordinates of the power amplifier and the reference voltage is, the closer the linearity of the power amplifier to be tested is to the theoretical state in the testing process is, and the more accurate the testing result is; if the difference value of the vertical coordinates of the power amplifier and the reference voltage is larger, the power amplifier to be tested generates larger linear distortion in the testing process, and the testing result is inaccurate and needs to be tested again.
Therefore, by the power amplifier testing method described in detail in the foregoing steps S101 to S108, the invention comprehensively considers the amplitude-phase distortion generated by the signal passing through the power amplifier to be tested, so that the accuracy of the calculated theoretical abscissa and ordinate of the third-order intermodulation intercept point is greatly improved, and substantially provides standard data for the actual test; meanwhile, the error of the test result can be obtained by combining the actual horizontal and vertical coordinates of the tested three-order intermodulation intercept points and comparing the difference value of the two, so that whether the test result is reliable or not can be obtained, and the test accuracy is greatly improved.
As shown in fig. 3, a second aspect of the present embodiment provides a hardware apparatus for implementing the method for testing a power amplifier described in the first aspect of the present embodiment, including: the device comprises a first acquisition unit, an output signal generation unit, a distortion fitting unit, a third-order intermodulation coefficient calculation unit, a test unit, a second acquisition unit, a third-order intermodulation intercept calculation unit and a comparison unit.
The first obtaining unit is configured to obtain a test signal based on an input-output characteristic function of a power amplifier to be tested, where the test signal includes a dual-tone signal.
And the output signal generating unit is used for obtaining a test output signal of the test signal after passing through the power amplifier to be tested according to the input and output characteristic function.
And the distortion fitting unit is used for carrying out amplitude-phase distortion fitting on the test output signal to obtain a nonlinear output signal of the power amplifier to be tested based on the amplitude-phase distortion effect.
And the third-order intermodulation coefficient calculation unit is used for obtaining the theoretical third-order intermodulation coefficient of the power amplifier to be tested according to the nonlinear output signal.
And the test unit is used for inputting the test signal into the power amplifier to be tested so as to obtain the actual third-order intermodulation coefficient of the power amplifier to be tested.
The second obtaining unit is used for obtaining the signal gain of the power amplifier to be tested.
The third-order intermodulation intercept point calculation unit is used for obtaining a theoretical horizontal and vertical coordinate of the third-order intermodulation intercept point of the power amplifier to be tested according to the theoretical third-order intermodulation coefficient and the signal gain, and obtaining an actual horizontal and vertical coordinate of the third-order intermodulation intercept point of the power amplifier to be tested according to the actual third-order intermodulation coefficient and the signal gain.
And the comparison unit is used for obtaining a nonlinear test result of the power amplifier to be tested according to the theoretical horizontal and vertical coordinates and the actual horizontal and vertical coordinates of the three-order intermodulation intercept point.
In one possible design, the third-order intermodulation intercept calculation unit includes: the device comprises an input power acquisition subunit, an abscissa calculation subunit and an ordinate calculation subunit.
And the input power acquisition subunit is used for acquiring the input power of the test signal.
And the abscissa calculating subunit is used for obtaining the theoretical abscissa of the third-order intermodulation intercept point according to the input power and the theoretical third-order intermodulation coefficient.
And the ordinate calculating subunit is used for obtaining the theoretical ordinate of the third-order intermodulation intercept point according to the theoretical abscissa and the signal gain.
In one possible design:
the abscissa calculating subunit is specifically configured to divide the theoretical third-order intermodulation coefficient by 2 to obtain a calculated value.
The abscissa calculating subunit is further specifically configured to sum the input power and the calculated value to obtain a theoretical abscissa of the third-order intermodulation intercept point.
In one possible design:
the ordinate calculating subunit is specifically configured to sum the theoretical abscissa of the third-order intermodulation intercept point and the signal gain to obtain the theoretical ordinate of the third-order intermodulation intercept point.
In one possible design:
and the second obtaining unit is specifically configured to obtain the input power of the test signal and the fundamental power of the test output signal according to the test output signal and the test signal.
The second obtaining unit is further specifically configured to obtain the signal gain according to the input power and the fundamental power.
In one possible design:
the distortion fitting unit is specifically configured to perform amplitude distortion fitting and phase distortion fitting on the test output signal to obtain an amplitude distortion output signal and a phase distortion output signal.
The distortion fitting unit is further specifically configured to obtain the nonlinear output signal according to the amplitude distortion output signal and the phase distortion output signal.
In one possible design:
the third-order intermodulation coefficient calculation unit is specifically configured to substitute the nonlinear output signal into the phase distortion output signal to obtain a nonlinear distortion signal.
The third-order intermodulation coefficient calculation unit is further specifically configured to obtain the theoretical third-order intermodulation coefficient according to the nonlinear distortion signal.
For the working process, the working details, and the technical effects of the hardware apparatus provided in this embodiment, reference may be made to the first aspect of the embodiment, which is not described herein again.
As shown in fig. 4, a third aspect of the present embodiment provides a computer main apparatus, including: a memory, a processor and a transceiver, which are connected in sequence in communication, wherein the memory is used for storing a computer program, the transceiver is used for transceiving a message, and the processor is used for reading the computer program and executing the method for testing the power amplifier according to the first aspect of the embodiment.
For example, the Memory may include, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Flash Memory (Flash Memory), a First In First Out (FIFO), and/or a First In Last Out (FILO), and the like; the processor may not be limited to a microprocessor of a model number STM32F105 series, a reduced instruction set computer (RSIC) microprocessor, an architecture processor such as X86, or a processor integrated with a neural-Network Processing Unit (NPU); the transceiver may be, but is not limited to, a wireless fidelity (WIFI) wireless transceiver, a bluetooth wireless transceiver, a General Packet Radio Service (GPRS) wireless transceiver, a ZigBee wireless transceiver (ieee802.15.4 standard-based low power local area network protocol), a 3G transceiver, a 4G transceiver, and/or a 5G transceiver, etc. In addition, the device may also include, but is not limited to, a power module, a display screen, and other necessary components.
For the working process, the working details, and the technical effects of the computer main device provided in this embodiment, reference may be made to the first aspect of the embodiment, which is not described herein again.
A fourth aspect of the present embodiment provides a computer-readable storage medium storing instructions for implementing the method for testing a power amplifier according to the first aspect, where the instructions are stored on the computer-readable storage medium, and when the instructions are executed on a computer, the method for testing a power amplifier according to the first aspect is performed.
The computer-readable storage medium refers to a carrier for storing data, and may include, but is not limited to, floppy disks, optical disks, hard disks, flash memories, flash disks and/or Memory sticks (Memory sticks), etc., and the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
For the working process, the working details, and the technical effects of the computer-readable storage medium provided in this embodiment, reference may be made to the first aspect of the embodiment, which is not described herein again.
A fifth aspect of the present embodiment provides a computer program product comprising instructions which, when run on a computer, which may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus, cause the computer to perform the method for testing a power amplifier according to the first aspect of the present embodiment.
Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for testing a power amplifier, comprising:
acquiring a test signal based on an input-output characteristic function of a power amplifier to be tested, wherein the test signal comprises a dual-tone signal;
obtaining a test output signal of the test signal after passing through the power amplifier to be tested according to the input and output characteristic function;
carrying out amplitude-phase distortion fitting on the test output signal to obtain a nonlinear output signal of the power amplifier to be tested based on the amplitude-phase distortion;
obtaining a theoretical third-order intermodulation coefficient of the power amplifier to be tested according to the nonlinear output signal;
inputting the test signal into the power amplifier to be tested to obtain a practical third-order intermodulation coefficient of the power amplifier to be tested;
acquiring the signal gain of the power amplifier to be tested;
obtaining a theoretical horizontal and vertical coordinate of a third-order intermodulation interception point of the power amplifier to be tested according to the theoretical third-order intermodulation coefficient and the signal gain, and obtaining an actual horizontal and vertical coordinate of the third-order intermodulation interception point of the power amplifier to be tested according to the actual third-order intermodulation coefficient and the signal gain;
and obtaining a nonlinear test result of the power amplifier to be tested according to the theoretical horizontal and vertical coordinates and the actual horizontal and vertical coordinates of the three-order intermodulation intercept points.
2. The method of claim 1, wherein obtaining a theoretical abscissa and ordinate of a third-order intermodulation intercept point of the power amplifier under test from the theoretical third-order intermodulation coefficient and the signal gain comprises:
acquiring the input power of the test signal;
obtaining a theoretical abscissa of the third-order intermodulation intercept point according to the input power and the theoretical third-order intermodulation coefficient;
and obtaining the theoretical ordinate of the third-order intermodulation intercept point according to the theoretical abscissa and the signal gain.
3. The method of claim 2, wherein obtaining a theoretical abscissa of the third-order intermodulation intercept point from the input power and the theoretical third-order intermodulation coefficient comprises:
dividing the theoretical third-order intermodulation coefficient by 2 to obtain a calculated value;
and summing the input power and the calculated value to obtain the theoretical abscissa of the third-order intermodulation interception point.
4. The method of claim 2, wherein obtaining a theoretical ordinate of the third order intermodulation intercept point from the theoretical abscissa and the signal gain comprises:
and summing the theoretical abscissa of the third-order intermodulation interception point and the signal gain to obtain the theoretical ordinate of the third-order intermodulation interception point.
5. The method of claim 1, wherein obtaining the signal gain of the power amplifier under test comprises:
according to the test output signal and the test signal, obtaining the input power of the test signal and the fundamental wave power of the test output signal;
and obtaining the signal gain according to the input power and the fundamental wave power.
6. The method of claim 1, wherein fitting amplitude-phase distortion to the test output signal to obtain a nonlinear output signal of the power amplifier under test based on the amplitude-phase distortion comprises:
carrying out amplitude distortion fitting and phase distortion fitting on the test output signal to obtain an amplitude distortion output signal and a phase distortion output signal;
and obtaining the nonlinear output signal according to the amplitude distortion output signal and the phase distortion output signal.
7. The method of claim 6, wherein deriving a theoretical third order intermodulation coefficient of the power amplifier under test from the nonlinear output signal comprises:
substituting the nonlinear output signal into the phase distortion output signal to obtain a nonlinear distortion signal;
and obtaining the theoretical third-order intermodulation coefficient according to the nonlinear distortion signal.
8. A test apparatus for a power amplifier, comprising: the device comprises a first acquisition unit, an output signal generation unit, a distortion fitting unit, a third-order intermodulation coefficient calculation unit, a test unit, a second acquisition unit, a third-order intermodulation intercept point calculation unit and a comparison unit;
the first obtaining unit is used for obtaining a test signal based on an input-output characteristic function of a power amplifier to be tested, wherein the test signal comprises a dual-tone signal;
the output signal generating unit is used for obtaining a test output signal of the test signal after passing through the power amplifier to be tested according to the input and output characteristic function;
the distortion fitting unit is used for carrying out amplitude-phase distortion fitting on the test output signal to obtain a nonlinear output signal of the power amplifier to be tested based on the amplitude-phase distortion effect;
the third-order intermodulation coefficient calculation unit is used for obtaining a theoretical third-order intermodulation coefficient of the power amplifier to be tested according to the nonlinear output signal;
the test unit is used for inputting the test signal into the power amplifier to be tested so as to obtain the actual third-order intermodulation coefficient of the power amplifier to be tested;
the second obtaining unit is used for obtaining the signal gain of the power amplifier to be tested;
the third-order intermodulation intercept point calculation unit is used for obtaining a theoretical horizontal and vertical coordinate of the third-order intermodulation intercept point of the power amplifier to be tested according to the theoretical third-order intermodulation coefficient and the signal gain, and obtaining an actual horizontal and vertical coordinate of the third-order intermodulation intercept point of the power amplifier to be tested according to the actual third-order intermodulation coefficient and the signal gain;
and the comparison unit is used for obtaining a nonlinear test result of the power amplifier to be tested according to the theoretical horizontal and vertical coordinates and the actual horizontal and vertical coordinates of the three-order intermodulation intercept point.
9. A test apparatus for a power amplifier, comprising: the power amplifier testing method comprises a memory, a processor and a transceiver which are connected in sequence, wherein the memory is used for storing computer programs, the transceiver is used for transmitting and receiving messages, and the processor is used for reading the computer programs and executing the testing method of the power amplifier according to any one of claims 1-7.
10. A computer-readable storage medium having stored thereon instructions for performing the method of testing a power amplifier according to any one of claims 1 to 7 when the instructions are run on a computer.
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