KR100766201B1 - Apparatus and method for measuring phase change of rf power amplifier - Google Patents

Abstract

The present invention relates to an RF power amplifier. To this end, the present invention measures a phase change of only a source frequency component in an RF power amplifier or obtains only relative phase information when a reference signal is canceled in an RF power amplifier. Unlike conventional methods of measuring phase change, in an RF power amplifier, a two-tone signal having an arbitrary tone spacing is applied to the power amplifier, and a third order intermodulation distortion signal of source frequency is placed above a specific frequency. Detects the phase difference value of the upper third order intermodulation distortion component before and after the amplifier, determines the actual value among the detected phase difference values, and determines the phase difference of the upper third order intermodulation distortion component. After storing as a value, place the lower third order intermodulation distortion signal at a specific frequency, Detects the phase difference value of the third-order intermodulation distortion component and measures the phase change according to the phase difference value of the upper-order third-order intermodulation distortion component and the lower-order third-order intermodulation distortion component. In addition, it is possible to measure not only the source frequency component but also the phase change of the third-order intermodulation distortion component.

RF Amplifier, Fundamental Frequency, 3rd Order Intermodulation Distortion, Phase Detector

Description

Phase change measuring device of RF power amplifier and its method {APPARATUS AND METHOD FOR MEASURING PHASE CHANGE OF RF POWER AMPLIFIER}

1 is a circuit diagram illustrating a phase change measuring apparatus of a power amplifier according to an exemplary embodiment of the present disclosure;

2 is a circuit diagram illustrating an apparatus for measuring a phase of a power amplifier according to another exemplary embodiment of the present disclosure;

3 is a circuit diagram illustrating a phase change measuring apparatus of a power amplifier suitable for measuring a phase change of a third order intermodulation distortion component according to a preferred embodiment of the present invention;

4 is a flowchart illustrating a process of measuring a phase change of a third order intermodulation distortion component by using a phase change measuring apparatus of a power amplifier according to an exemplary embodiment of the present invention;

5 is a graph showing the characteristics of a phase detector according to an embodiment of the present invention;

6 is a graph illustrating measured phase characteristics of source frequency components and third-order intermodulation distortion components according to gate bias voltage and output power in a preferred embodiment of the present invention;

7A and 7B are graphs illustrating phase and magnitude characteristics of upper and lower third-order intermodulation distortion signals according to tone spacing and output power in a preferred embodiment of the present invention;

8A and 8B are graphs illustrating phase and magnitude characteristics of upper and lower third-order intermodulation distortion signals according to tone spacing and output power according to tone spacing and output power in a preferred embodiment of the present invention;

9A and 9B are graphs illustrating magnitudes and phase characteristics of upper and lower third-order intermodulation distortion signals according to tone spacing and gate bias voltage at an output power of 34 dBm according to an embodiment of the present invention;

10A and 10B are graphs illustrating magnitudes and phase characteristics of upper and lower third-order intermodulation distortion signals according to tone spacing and gate bias voltages at 37 dBm of output power in another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

302: distortion signal generator 302a: first signal generator

302b: second signal generator 302c: drive amplifier

304: first path portion 304a: first coupler

304b: first fixed attenuator 304c: delay line

304d: first mixer 304e: first bandpass filter

304f: first gain amplifier 304g: variable phase shifter

306: signal generator 306a: local oscillator

306b: Splitter 308: main power amplifier

310: second path portion 310a: second coupler

310b: second fixed attenuator 310c: second mixer

310d: second band pass filter 310e: second gain amplifier

312: phase detector

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for measuring phase shift of RF power amplifiers, and more particularly to a third-order intermodulation distortion component as well as a fundamental frequency generated in an RF power amplifier of a mobile communication system. The present invention relates to an apparatus and method for measuring phase change of an RF power amplifier suitable for measuring a phase change of distortion.

As is well known, it is possible to define the characteristics of the memory effect in a power amplifier or to actually measure and verify the phase characteristics as well as the magnitude characteristics of the third-order intermodulation distortion components for optimal performance of linearizers such as predistortion linearizers. Is very important.

In general, the magnitude component of the third-order intermodulation distortion component by the power amplifier can be simply measured by using a spectrum analyzer, but the magnitude of the third-order intermodulation distortion component is very small compared to the original frequency component. As a result, it is very difficult to measure phase components using a phase meter such as a network analyzer generally used for phase measurement.

Accordingly, an expensive analyzer such as a vector signal analyzer is required to check the phase characteristics of the third-order intermodulation distortion component, and in the absence of such an analyzer, another complicated device is required. Very precise adjustment and control is required, and in the absence of such devices, the measurement error that occurs in the measurement of the phase change is a major factor in reducing the reliability of the final result.

Conventionally, a phase change measuring method performed using an RF power amplifier is a method of measuring a phase change of only a source frequency component or measuring a phase of a source frequency and a third order intermodulation distortion component by a power amplifier. After generating the reference signal by constructing the intermodulation distortion signal generator inside or applying the third order intermodulation distortion component signal from the outside to adjust the variable attenuator and the variable phase shifter, Phase shifts were measured in a comparable or canceling manner. This will be described below in more detail with reference to a conventional embodiment.

1 is a circuit diagram illustrating an apparatus for measuring a phase change of a power amplifier according to an exemplary embodiment of the present invention, wherein a first reference signal generator 102a, a second reference signal generator 102b, a combiner 104, and a first coupler ( 106, a first fixed attenuator 108, a power amplifier 110, a second coupler 112, a second fixed attenuator 114, a variable phase shifter 116 and a phase detector 118. A phase change measuring method according to an exemplary embodiment will be described with reference to these drawings.

Referring to FIG. 1, a device for measuring phase change by extracting only source frequency components through a first coupler 106 and a second coupler 112 before and after the power amplifier 110. Since the phase change of only the source frequency component can be measured, the phase change of the third-order intermodulation distortion component which has the greatest influence among the intermodulation distortion signals generated by the nonlinearity of the power amplifier 110 cannot be measured, and When the two-tone signal having a wide tone interval is applied because there is no compensation for the group speed delay as it passes through the amplifier 110, there is a problem in that the accurate phase change before and after the power amplifier 110 cannot be measured.

FIG. 2 is a circuit diagram illustrating an apparatus for measuring a phase of a power amplifier according to another exemplary embodiment, and includes a first reference signal generator 202a, a second reference signal generator 202b, a first combiner 204, and a divider 206. ), A first variable attenuator 208, a main power amplifier 210, a second variable attenuator 212, a variable phase shifter 214, a intermodulation signal generator 216, and a second combiner 218. . Through this drawing, a phase change measuring method according to another exemplary embodiment will be described.

Referring to FIG. 2, a reference signal is generated by the intermodulation distortion signal generator 216, and when the reference signal is canceled, the first variable attenuator 208 and the second variable attenuator 212 and the variable phase shifter ( 214) Only the phase information relative to the magnitude can be obtained according to the change in the inter-value, and it depends on the nonlinearity of the intermodulation distortion signal generator 216, and there is a problem in that the phase change according to the tone interval is unknown.

Other conventional phase change measurement methods are complicated to install the measuring device, require expensive equipment, and are not suitable for measuring phase distortion according to tone spacing for the memory effect occurring in the RF power amplifier. In addition, when using a reference source signal generator or a local oscillator to produce a two-tone signal, there is a problem that can not measure the phase change of the power amplifier alone because their frequency changes or the phase changes randomly at power on and off.

Therefore, in the conventional phase change measurement of the RF power amplifier, the phase change is measured by measuring the phase change of only the source frequency component of the power amplifier or obtaining only relative phase information when the reference signal is canceled by the power amplifier. By measuring, there is a limit in measuring the phase component of the third-order intermodulation distortion signal of the power amplifier.

Accordingly, the present invention is to solve the above problems of the prior art, the phase change measuring device of the RF power amplifier capable of measuring the phase change of the third-order intermodulation distortion component as well as the source frequency generated in the RF power amplifier and The purpose is to provide a method.

Another object of the present invention for solving the problems of the prior art, it is possible to measure the phase change of the third-order intermodulation distortion component generated in the RF power amplifier according to various tone intervals, the magnitude of the output power and the gate bias voltage. The present invention provides an apparatus and a method for measuring a phase change of an RF power amplifier.

In accordance with an aspect of the present invention, there is provided an apparatus for measuring a phase change of a third order intermodulation distortion signal by an RF power amplifier, and combining and distorting and outputting two input source signals. And a signal generator for placing the upper third-order intermodulation distortion signal or the lower third-order intermodulation distortion signal at a specific frequency, distributing and outputting such a signal, and extracting a signal output from the distortion signal generator. After attenuating the magnitude and compensating for the group speed delay, mixing with the signal output from the signal generator, outputting a component of a specific frequency of this signal, amplifying it according to the measurement range, and measuring the phase difference value A first path part adapted to discriminate actual values and a magnitude of a signal output from the distortion signal generator Amplify and change the phase, and extract and attenuate the magnitude of the signal output from the main power amplifier, mix it with the signal output from the signal generator, output a component of a specific frequency of the signal, A phase change of the RF power amplifier including a second path part for amplifying and applying a signal according to a measurement range, and a phase detector for detecting a phase difference between respective output signals applied from the first path part and the second path part; Provide a measuring device.

In another aspect for achieving the above object, the present invention provides a method for measuring a phase change of a third order intermodulation distortion signal by an RF power amplifier, comprising applying a two-tone signal having an arbitrary tone interval to the RF power amplifier. Positioning a third order intermodulation distortion signal of a source frequency above a specific frequency, detecting a phase difference value of an upper third order intermodulation distortion component before and after the RF power amplifier, and detecting the Determining an actual value among the obtained phase difference values, storing the determined actual value as a phase difference value of the upper third order intermodulation distortion component, and placing the lower third order intermodulation distortion signal at a specific frequency. Detecting a phase difference value of the lower third order intermodulation distortion component before and after the RF power amplifier, and the upper third order horn To provide the crude distortion component and the lower third order intermodulation phase shift measuring method of the RF power amplifier comprising the step of measuring a change in phase according to phase difference of the distortion component.

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The core technology of the present invention is a conventional method of measuring the phase change by measuring the phase change of only the source frequency component in the RF power amplifier or obtaining only the relative phase information when the reference signal is canceled in the RF power amplifier. Alternatively, in an RF power amplifier, a two-tone signal having an arbitrary tone interval is applied to the power amplifier to detect a phase difference value of the upper third-order intermodulation distortion component before and after the power amplifier, By detecting the phase difference value of the lower third order intermodulation distortion component, and measuring the phase change according to the phase difference value of the upper third order intermodulation distortion component and the lower third order intermodulation distortion component. Through it can easily achieve the purpose of the present invention.

3 is a circuit diagram illustrating a phase change measuring apparatus of an RF power amplifier suitable for measuring a phase change of a third order intermodulation distortion component according to an exemplary embodiment of the present invention, wherein the distortion signal generator 302 and the first path unit are shown in FIG. 304, a signal generator 306, a main power amplifier 308, a second path 310, and a phase detector 312. Here, the distortion signal generator 302 includes a first signal generator 302a, a second signal generator 302b, a combiner 302c, and a drive amplifier 304d, and the first path portion 304 is formed of a first signal generator 302a. First coupler 304a, first fixed attenuator 304b, delay line 304c, first mixer 304d, first band pass filter 304e, first gain amplifier 304f and variable phase shifter 304g ). In addition, the signal generator 306 includes a local oscillator 306a and a divider 306b, and the second path part 310 includes a second coupler 310a, a second fixed attenuator 310b, and a second mixer ( 310c), a second band pass filter 310d and a second gain amplifier 310e. Through this figure will be described a method of measuring the phase change of the power amplifier according to the present invention.

Referring to FIG. 3, in the distortion signal generator 302, f1 and f2, which are input signals from the first signal generator 302a and the second signal generator 302b, are combined and output through the combiner 302c. The signal is generated and output through weakly distorted signals of 2f1-f2 and 2f2-f1 through the driving amplifier 302d. Here, f1 and f2 denote source frequency signals of a transmission band, respectively, and 2f1-f2 and 2f2-f1 denote third-order intermodulation distortion signals, respectively. The signal band of this input signal is 2.11 GHz-2.17 GHz.

In the first path unit 304, some signals of 2f1-f2 and 2f2-f1 generated and output from the driving amplifier 302c are extracted and coupled through the first coupler 304a. The magnitude of the signal is attenuated through the fixed attenuator 304b and the delay line 304c and subjected to a group speed delay as long as it passes through the main power amplifier 308.

In addition, the group speed delayed signal is mixed with the signal from the signal generator 306 through the first mixer 304d, selects a signal of a specific frequency band through the first band pass filter 304e, and selects the selected signal. Is amplified by the first gain amplifier 304f, and the amplified signal is phase shifted through the variable phase shifter 304g and applied to the phase detector 312. Here, the first band pass filter 304e outputs a component of a specific frequency from the signal output from the first mixer 304d and removes the remaining component signals, and the variable phase shifter 304g receives the first signal. It is connected in series between the gain amplifier 304f and the phase detector 312, and distinguishes the actual value of the two phase difference values detected by the phase detector 312.

Here, the signal generator 306 is composed of a local oscillator 306a and a divider 306b, wherein the local oscillator 306a has an intermediate frequency of first band pass filter 304e and second band pass. Fixed at 360 MHz due to filter 310d, the frequency must be adjusted to select the desired third order intermodulation distortion signal from 1.75 GHz to 1.81 GHz, and this local oscillator 306a has an upper third order intermodulation distortion signal or a lower three The differential intermodulation distortion signal is positioned at a specific frequency, and the divider 306b distributes the output signal from the local oscillator 306a and is output to the first mixer 304d or the second mixer 310c.

Next, the signal output from the driving amplifier 302d is amplitude amplified and phase shifted through the main power amplifier 308, and the output signal is coupled to the second path portion 310 through the second coupler 308a. The coupled signal is output by preventing power saturation of the elements through the second fixed attenuator 310b, and the output signal is mixed with the signal from the signal generator 306 through the second mixer 310c. The signal is selected only by a signal of a specific frequency band through the second band pass filter 310d, amplified by the second gain amplifier 310e, and applied to the phase detector 312.

In such a circuit diagram, the first mixer 304d and the second mixer 310c, the first band pass filter 304e and the second band pass filter 310d, the first gain amplifier 304f and the second gain amplifier ( 310e) are located symmetrically and perform the same function. Here, the first band pass filter 304e and the second band pass filter 310d have a stopband characteristic of 40 dB at a 3 dB bandwidth of 200 KHz and an offset of 400 KHz, and a SAW filter having a center frequency of 360 MHz. And third-order intermodulation distortion signals of a two-tone signal having a tone interval of 500 KHz or more, according to the characteristics of each of these band pass filters.

Next, in the phase detector 312, the phase difference between the signal applied from the variable phase shifter 304g of the first path unit 304 and the signal applied from the second gain amplifier 310d of the second path unit 310 is determined. Will be measured. Here, the phase detector 312 has an input signal range of -60 dBm to 0 dBm, for example, the first path portion 304 and the second path portion 310 using the AD8302 of Analog Devices. The phase difference between the two signals inputted through) is represented by a voltage of 10 mV / degree resolution.

Therefore, using the phase change measuring device of the RF power amplifier, it is possible to measure not only the source frequency components of the power amplifier but also the third-order intermodulation distortion signal components.

Next, a process of measuring the phase change of the third-order intermodulation distortion component using the phase change measuring device of the RF power amplifier having the above-described configuration will be described.

4 is a flowchart illustrating a process of measuring a phase change of a third-order intermodulation distortion component by using a phase change measuring apparatus of an RF power amplifier according to a preferred embodiment of the present invention. Through this figure, an example of arbitrary frequencies will be described for the phase change measurement process according to the present invention.

4, two reference source signals from the first reference signal generator 302a and the second reference signal generator 302b are combined through a combiner 302c to provide a constant tone spacing to the main power amplifier 308. A two-tone signal is applied (step 402). For example, a two-tone signal having a center frequency of 2.14 GHz and a tone spacing of 1 MHz is applied, and these two-tone signals are signals having frequencies of 2.1395 GHz and 2.1405 GHz, respectively.

Then, the local oscillator 306a is adjusted to position the third order intermodulation distortion signal of the source frequency above a specific frequency (step 404). In this case, the frequencies of the 3rd intermodulation distortion signal at the top and bottom are 2.1385 GHz and 2.1415 GHz, respectively, and the local oscillator 306a transmits the 3rd intermodulation distortion signal at the top and bottom at a specific frequency (for example, 360 MHz). In order to down-convert, the frequency is 1.7785 GHz and 1.7815 GHz, respectively.

Next, the upper third-order intermodulation before and after the main power amplifier 308 using the phase detector 312 for each signal output from the first path section 304 and the second path section 310. The phase difference value of the distortion component is detected (step 406). Here, the detection of the phase difference value is performed by reading a DC voltage using a multimeter and converting the value into a phase difference value.

Also, the variable phase shifter 304g is adjusted to distinguish the actual value from the two values detected by the phase detector 312 (step 408). Here, the variable phase shifter 304g is connected in series between the first gain amplifier 304f and the phase detector 312, thereby distinguishing the actual value among the two measured difference values by the phase detector 312. can do. Here, since the phase measurement using the phase detector 312 has two values, the actual value is distinguished through the change direction of the DC voltage value measured when the variable phase shifter 304g is adjusted.

After the actual value is distinguished by adjusting the variable phase shifter 304g, the phase difference value of the upper third-order intermodulation distortion signal is stored (step 410).

Thereafter, when the measurement of the upper third order intermodulation distortion signal is completed, the local oscillator 306a is adjusted to position the lower third order intermodulation distortion signal above a specific frequency (step 412).

Next, the phase difference value of the lower third-order intermodulation distortion component is detected before and after the main power amplifier 308 through the phase detector 312 (step 414).

Next, the phase difference values of the upper third order intermodulation distortion component and the lower third order intermodulation distortion component are compared and analyzed to measure the phase change by the main power amplifier 308 (step 416).

Therefore, after detecting the phase difference value of the upper third order intermodulation distortion component before and after the main power amplifier, the phase difference value of the lower third order intermodulation distortion component is detected to measure the phase change by the main power amplifier or If the center frequency or tone spacing of the input signal changes, only the frequency of the local oscillator can be changed and measured.

Next, the characteristics of the phase detector and the phase characteristics of the source frequency component and the third-order intermodulation distortion component when the phase change is measured by using the phase change measuring apparatus of the power amplifier having the above-described configuration will be described.

5 is a graph illustrating the characteristics of a phase detector according to an exemplary embodiment of the present invention, wherein the voltage range is measured as a relative phase difference between two input signals applied to the phase detector 312. Here, any one detection voltage may have two phase information as shown in FIG. 3, but the variable phase shifter 304g may be used to distinguish the actual phase as shown in FIG. 3. When the phase control voltage Vphase of the variable phase shifter 304g is increased, the detected voltage Vdet is increased in the region I and the detected voltage Vdet is decreased in the region II. At this time, the variable phase shifter 304g is used to know the position of the first detected phase and is fixed during the phase measurement.

FIG. 6 is a graph illustrating measured phase characteristics of source frequency components and tertiary intermodulation distortion components according to gate bias voltage and output power in a preferred embodiment of the present invention. When the phase is assumed to be 0, the measured values are relatively measured. Since the measurement range of the phase detector 312 is 60 dB, the source frequency component and the third-order intermodulation distortion component can be simultaneously measured, and the relative phase measurements with respect to each other are measured. Of course this is possible. In addition, the memory effect in the main power amplifier 308 only checks the magnitude and phase difference between the upper third order intermodulation distortion signal (Higher IM3, IM3H) and the lower third order intermodulation distortion signal (Lower IM3, IM3L). It can be measured.

7A and 7B are graphs illustrating the phase and magnitude characteristics of the upper and lower third-order intermodulation distortion signals according to tone spacing and output power in a preferred embodiment of the present invention. When the gate bias voltage is 3.92V, Narrow spacing shows little difference in magnitude and phase between the upper and lower third-order intermodulation distortion signals, but larger tone spacing indicates a larger phase difference at lower outputs due to memory effects, and at higher outputs, even when the tone spacing increases. And the phase difference decreases.

8A and 8B are graphs illustrating the phase and magnitude characteristics of upper and lower third-order intermodulation distortion signals according to tone spacing and output power according to tone spacing and output power in a preferred embodiment of the present invention. At 3.99V, the magnitude and phase difference of the upper and lower third-order intermodulation distortion signals are very small regardless of tone spacing and output power. Here, the phase distortion of the third-order intermodulation distortion component in FIGS. 7A, 7B, 8A, and 8B depends on the gate bias and the output power, indicating that the memory effect is reduced at the high output power and the gate bias voltage.

9A and 9B are graphs illustrating magnitudes and phase characteristics of upper and lower third-order intermodulation distortion signals according to tone spacing and gate bias voltage at an output power of 34 dBm according to an embodiment of the present invention. 10B is a graph illustrating magnitudes and phase characteristics of the upper and lower third order intermodulation distortion signals according to tone spacing and gate bias voltage at 37 dBm of output power according to another embodiment of the present invention. As shown in the gate bias of 3.915V, as shown in FIGS. 10A and 10B, the IMD sweet spot depends on the output power and the gate bias at 3.85V of the gate bias, and at the gate bias 3.98, depending on the tone spacing. The phase difference is minimized as the and 3rd order intermodulation distortion signals overlap.

In the foregoing description, the present invention has been described with reference to preferred embodiments, but the present invention is not necessarily limited thereto. Those skilled in the art will appreciate that the present invention may be modified without departing from the spirit of the present invention. It will be readily appreciated that branch substitutions, modifications and variations are possible.

As described above, the present invention relates to a conventional method of measuring a phase change by measuring a phase change of only a source frequency component in an RF power amplifier or obtaining only relative phase information when a reference signal is canceled in an RF power amplifier. Alternatively, in an RF power amplifier, a two-tone signal having an arbitrary tone interval is applied to the power amplifier to detect a phase difference value of the upper third-order intermodulation distortion component before and after the power amplifier, After detecting the phase difference value of the lower third order intermodulation distortion component, and measuring the phase change according to the phase difference value of the upper third order intermodulation distortion component and the lower third order intermodulation distortion component, The phase change of the third-order intermodulation distortion component as well as the source frequency component generated later can be effectively measured.

In addition, by effectively measuring the relative difference value and the change value of the third order intermodulation distortion component in the power amplifier, it is possible to effectively grasp the phase change characteristic of the third order intermodulation distortion component by the power amplifier.

In addition, it is possible to measure the relative change of the phase of the distortion component in the power amplifier according to various tone intervals, the magnitude of the output power, the gate bias voltage, and the third-order intermodulation distortion signal extracted from the input and output stages of the power amplifier Since it has a symmetrical structure until it is applied to a detector, it is possible to measure the phase change of only the power amplifier regardless of the random change of phase due to the change of the frequency of the reference signal generator or the local oscillator or the operation. It is easy to measure the effects and can contribute greatly to the design of predistortion power amplifiers and model extraction of power amplifiers.

Claims (8)

A device for measuring a phase change of a third-order intermodulation distortion signal by an RF power amplifier, A distortion signal generator for combining and outputting two reference source signals to be distorted; A signal generator which locates an upper third-order intermodulation distortion signal or a lower third-order intermodulation distortion signal at a specific frequency and distributes and outputs such a signal; Extract the signal output from the distortion signal generator to attenuate the signal magnitude, compensate for the group speed delay, mix with the signal output from the signal generator, output a component of a specific frequency of this signal, and measure the range A first path portion which is amplified according to and adjusted to be applied to distinguish an actual value from two measured phase difference values; A main power amplifier for amplifying a magnitude of a signal output from the distortion signal generator and changing a phase; A second path that extracts the signal output from the main power amplifier, attenuates its magnitude, mixes it with the signal output from the signal generator, outputs a component of a specific frequency of the signal, and amplifies and applies it according to a measurement range Wealth, Phase detector for detecting the phase difference of each output signal applied from the first path portion and the second path portion Phase change measuring device of the RF power amplifier comprising a. The method of claim 1, The distortion signal generator, A combiner for coupling the input two reference source signals; Drive amplifier distorting the signal output from the combiner Phase change measuring apparatus of the RF power amplifier comprising a. The method of claim 1, The signal generator, A local oscillator for positioning an upper third order intermodulation distortion signal or a lower third order intermodulation distortion signal at a specific frequency; Splitter for distributing the signal output from the local oscillator Phase change measuring apparatus of the RF power amplifier comprising a. The method of claim 1, The first path portion, A first coupler extracting a signal output from the distortion signal generator; A first fixed attenuator configured to attenuate the magnitude of the signal extracted from the first coupler; A delay line for compensating for the group speed delay by the signal output from the first fixed attenuator while passing through the main power amplifier; A first mixer for mixing the signal output from the signal generator and the signal passing through the delay line; A first band pass filter for outputting a component having a specific frequency from the signal output from the first mixer and removing the remaining components; A first gain amplifier for amplifying the signal output from the first band pass filter into the measurement range of the phase detector; A variable phase shifter connected in series with the first gain amplifier and the phase detector to adjust to distinguish an actual value among two phase difference values measured by the phase detector Phase change measuring apparatus of the RF power amplifier comprising a. The method of claim 1, The second path portion, A second coupler for extracting a signal output from the main power amplifier; A second fixed attenuator configured to attenuate the magnitude of the signal output from the second coupler; A second mixer for mixing the signal output from the signal generator and the signal output from the second fixed attenuator; A second band pass filter for outputting a component of a specific frequency from the signal output from the second mixer and removing the remaining components; A second gain amplifier for amplifying the signal output from the second band pass filter into the measurement range of the phase detector Phase change measuring apparatus of the RF power amplifier comprising a. A method for measuring the phase change of a third order intermodulation distortion signal by an RF power amplifier, Applying a two-tone signal having an arbitrary tone interval to the RF power amplifier, Placing a third order intermodulation distortion signal of a source frequency above a particular frequency; Detecting a phase difference value of an upper third-order intermodulation distortion component before and after the RF power amplifier; Determining an actual value among the detected phase difference values; Storing the determined actual value as a phase difference value of the upper third order intermodulation distortion component; Positioning the lower third order intermodulation distortion signal at a specific frequency; Detecting a phase difference value of the lower third-order intermodulation distortion component before and after the RF power amplifier; Measuring a phase change according to a phase difference value of the upper third order intermodulation distortion component and the lower third order intermodulation distortion component; Phase change measurement method of the RF power amplifier comprising a. The method of claim 6, The detecting of the phase difference value is performed by reading a DC voltage value using a multimeter and converting the value into a phase difference value. The method of claim 6, The determination of the actual value is a phase change measuring method of an RF power amplifier, characterized in that is performed through the change direction of the DC voltage value measured when adjusting the variable phase shifter.

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