Method for obtaining GaN RF peak current, extra-pulse average current and efficiency
By performing secondary measurement of RF pulses based on traditional RF dynamic efficiency tests, the peak current and out-of-pulse average current of GaN RF devices are obtained, and the test deviation problem caused by the current collapse effect is solved, achieving high-precision efficiency evaluation.
Patent Information
- Application Number
- CN202110843820.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-07-26
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2041-07-26
AI Technical Summary
Due to the current collapse effect of GaN RF devices, traditional RF dynamic efficiency tests have caused large deviations, and they cannot effectively obtain peak current and out-of-pulse average current.
The method of performing secondary measurement of radio frequency pulses based on a single radio frequency pulse measurement is used to calculate the peak current and out-of-pulse average current by obtaining the average current and duty cycle of the first and second measurements.
It achieves high-precision acquisition of the peak current of GaN RF, average current from pulse and dynamic efficiency, reduces test deviations, and improves the evaluation accuracy of GaN RF devices.
Smart Images
Figure CN113740596B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of gallium nitride radio frequency technology, and particularly relates to a method for obtaining the peak current, off-pulse average current and efficiency of gallium nitride radio frequency. Background Art
[0002] Referring to Figure 1 as shown, the method for obtaining the radio frequency dynamic efficiency of traditional devices is to perform a single radio frequency pulse measurement. Among them, the in-pulse width time within a single period is w1 (the time when the pulse signal is at a high level), and the off-pulse duration is u1 (the time when the pulse signal is at a low level). The duty cycle can obtain the relational expressions of the average current, peak current i1 (the current when the pulse signal is at a high level) and off-pulse current i2 (the current when the pulse signal is at a low level), as follows:
[0003]
[0004] For traditional devices, the average current I1 and the off-pulse current i2 are regular and can be obtained through testing. Therefore, the peak current i1 can be calculated:
[0005]
[0006] Based on the peak current i1, the radio frequency dynamic efficiency of traditional devices is obtained as follows:
[0007]
[0008] However, due to its heteroepitaxial technology, gallium nitride radio frequency devices have a current collapse effect. Referring to Figure 2 as shown, specifically, partial capture of channel electrons occurs between the gate and the drain under different stresses, resulting in partial capture of channel electrons between the gate and the drain under different stresses, manifested as a decrease in the drain current (amplitude and recovery time). The characteristics of current collapse lead to large deviations in the traditional radio frequency dynamic efficiency test.
[0009] Furthermore, referring to Figure 3 as shown, the off-pulse dynamic current i2 curve of gallium nitride radio frequency varies greatly with different input powers and has a large amplitude drop. Therefore, traditional fitting methods cannot be used to obtain it. Summary of the Invention
[0010] The purpose of the present invention is to overcome the deficiencies of the prior art and propose a method for obtaining the peak current, off-pulse average current and efficiency of gallium nitride radio frequency. Based on the single radio frequency pulse measurement, a secondary radio frequency pulse measurement is performed to achieve high-precision acquisition of the peak current, off-pulse average current and dynamic efficiency of gallium nitride radio frequency.
[0011] The technical solution adopted by the present invention to solve its technical problems is as follows:
[0012] On the one hand, a method for obtaining the peak current of a gallium nitride radio frequency includes:
[0013] Perform a first radio frequency pulse measurement on the gallium nitride radio frequency device to obtain a first average current and a first duty cycle;
[0014] Under the same input power, use a pulse signal with the same amplitude to perform a second radio frequency pulse measurement on the gallium nitride radio frequency device to obtain a second average current and a second duty cycle; the first duty cycle is not equal to the second duty cycle;
[0015] Based on the first average current, the first duty cycle, the second average current, and the second duty cycle, obtain the peak current.
[0016] Preferably, the obtaining of the peak current based on the first average current, the first duty cycle, the second average current, and the second duty cycle specifically includes:
[0017] Obtain the relationship between the first average current and the first peak current and the first off-pulse average current of the first radio frequency pulse measurement, as follows:
[0018]
[0019] Wherein, I1 represents the first average current; i1 represents the first peak current; i2 represents the first off-pulse average current; dc1 represents the first duty cycle; w1 represents the first pulse width time within a single period; u1 represents the first off-pulse duration within a single period;
[0020] Obtain the relationship between the second average current and the second peak current and the second off-pulse average current of the second radio frequency pulse measurement, as follows:
[0021]
[0022] Wherein, I2 represents the second average current; i11 represents the second peak current; i22 represents the second off-pulse average current; dc2 represents the second duty cycle; w11 represents the second pulse width time within a single period; u11 represents the second off-pulse duration within a single period;
[0023] Based on the fact that the input signal amplitudes of the first radio frequency pulse measurement and the second radio frequency pulse measurement are equal, and the gain of the gallium nitride radio frequency device is constant, it can be obtained that the first peak current is equal to the second peak current, that is, the peak current; the first off-pulse average current is equal to the second off-pulse average current, that is, the off-pulse average current; specifically as follows:
[0024]
[0025] Combine equations (1) to (3) to obtain the peak current as follows:
[0026]
[0027] Preferably, the first pulse width time is less than or equal to 2 ms; the second pulse width time is less than or equal to 2 ms.
[0028] On the other hand, a method for obtaining the average current outside the radio frequency pulse of gallium nitride includes:
[0029] Perform a first radio frequency pulse measurement on the gallium nitride radio frequency device to obtain the first average current and the first duty cycle;
[0030] Under the same input power, use a pulse signal with the same amplitude to perform a second radio frequency pulse measurement on the gallium nitride radio frequency device to obtain the second average current and the second duty cycle; the first duty cycle is not equal to the second duty cycle;
[0031] Based on the first average current, the first duty cycle, the second average current, and the second duty cycle, obtain the average current outside the pulse.
[0032] Preferably, the step of obtaining the average current outside the pulse based on the first average current, the first duty cycle, the second average current, and the second duty cycle specifically includes:
[0033] Obtain the relationship between the first average current and the first peak current and the first average current outside the radio frequency pulse measurement as follows:
[0034]
[0035] Wherein, I1 represents the first average current; i1 represents the first peak current; i2 represents the first average current outside the pulse; dc1 represents the first duty cycle; w1 represents the first pulse width time within a single period; u1 represents the first duration outside the pulse within a single period;
[0036] Obtain the relationship between the second average current and the second peak current and the second average current outside the radio frequency pulse measurement as follows:
[0037]
[0038] Wherein, I2 represents the second average current; i11 represents the second peak current; i22 represents the second average current outside the pulse; dc2 represents the second duty cycle; w11 represents the second pulse width time within a single period; u11 represents the second duration outside the pulse within a single period;
[0039] Based on the fact that the input signal amplitudes of the first radio frequency (RF) pulse measurement and the second RF pulse measurement are equal, and the gain of the gallium nitride (GaN) RF device is constant, it can be obtained that the first peak current is equal to the second peak current, that is, the peak current; the first average current outside the pulse is equal to the second average current outside the pulse, that is, the average current outside the pulse. Specifically as follows:
[0040]
[0041] Combining equations (1) to (3), the average current outside the pulse is obtained as follows:
[0042]
[0043] Preferably, the first pulse width time is less than or equal to 2 ms; the second pulse width time is less than or equal to 2 ms.
[0044] On the other hand, a method for obtaining the GaN RF efficiency includes:
[0045] Performing a first RF pulse measurement on the GaN RF device to obtain a first average current and a first duty cycle;
[0046] Under the same input power, using a pulse signal with the same amplitude to perform a second RF pulse measurement on the GaN RF device to obtain a second average current and a second duty cycle; the first duty cycle is not equal to the second duty cycle;
[0047] Based on the first average current, the first duty cycle, the second average current, and the second duty cycle, obtaining the peak current;
[0048] Based on the first average current, the first duty cycle, the second average current, the second duty cycle, and the peak current, obtaining the GaN RF efficiency.
[0049] Preferably, the obtaining the peak current based on the first average current, the first duty cycle, the second average current, and the second duty cycle specifically includes:
[0050] Obtaining the relationship between the first average current and the first peak current and the first average current outside the pulse of the first RF pulse measurement as follows:
[0051]
[0052] Wherein, I1 represents the first average current; i1 represents the first peak current; i2 represents the first average current outside the pulse; dc1 represents the first duty cycle; w1 represents the first pulse width time within a single period; u1 represents the first duration outside the pulse within a single period;
[0053] Obtaining the relationship between the second average current and the second peak current and the second average current outside the pulse of the second RF pulse measurement as follows:
[0054]
[0055] Wherein, I2 represents the second average current; i11 represents the second peak current; i22 represents the second off-pulse average current; dc2 represents the second duty cycle; w11 represents the second pulse width time within a single period; u11 represents the second off-pulse duration within a single period.
[0056] Based on the fact that the input signal amplitudes of the first radio frequency pulse measurement and the second radio frequency pulse measurement are equal, and the gain of the gallium nitride radio frequency device is constant, it can be obtained that the first peak current is equal to the second peak current, that is, the peak current; the first off-pulse average current is equal to the second off-pulse average current, that is, the off-pulse average current. Specifically as follows:
[0057]
[0058] Combining equations (1) to (3), the peak current is obtained as follows:
[0059]
[0060] Preferably, based on the first average current, the first duty cycle, the second average current, the second duty cycle, and the peak current, the gallium nitride radio frequency efficiency is obtained as follows:
[0061]
[0062] Preferably, the first pulse width time is less than or equal to 2 ms; the second pulse width time is less than or equal to 2 ms.
[0063] The present invention has the following beneficial effects:
[0064] A method for obtaining the peak current, off-pulse average current, and efficiency of a gallium nitride radio frequency in the present invention performs a second radio frequency pulse measurement on the basis of a single radio frequency pulse measurement, realizes high-precision acquisition of the peak current, off-pulse average current, and dynamic efficiency of the gallium nitride radio frequency, and further realizes the evaluation of the corresponding indicators of the gallium nitride radio frequency device.
[0065] The following further elaborates on the present invention in detail in conjunction with the drawings and embodiments, but the method for obtaining the peak current, off-pulse average current, and efficiency of a gallium nitride radio frequency in the present invention is not limited to the embodiments. Description of the Drawings
[0066] Figure 1 It is a schematic diagram of a traditional single radio frequency pulse measurement;
[0067] Figure 2 It is a current characteristic curve diagram under the current collapse of gallium nitride during a single radio frequency pulse measurement;
[0068] Figure 3 Current characteristic curve under gallium nitride current collapse during single - shot RF pulse measurement at different input powers;
[0069] Figure 4 Flow chart of the method for obtaining the RF peak current of gallium nitride of the present invention;
[0070] Figure 5 Current characteristic curve under gallium nitride current collapse during two - shot RF pulse measurement of the present invention;
[0071] Figure 6 Flow chart of the method for obtaining the average current outside the RF pulse of gallium nitride of the present invention;
[0072] Figure 7 Flow chart of the method for obtaining the RF efficiency of gallium nitride of the present invention. Specific embodiments
[0073] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope protected by the embodiments of the present invention.
[0074] See Figure 4 As shown, a method for obtaining the RF peak current of gallium nitride includes:
[0075] S401, perform a first RF pulse measurement on the gallium nitride RF device to obtain a first average current and a first duty cycle;
[0076] S402, at the same input power, use a pulse signal with the same amplitude to perform a second RF pulse measurement on the gallium nitride RF device to obtain a second average current and a second duty cycle; the first duty cycle is not equal to the second duty cycle;
[0077] S403, based on the first average current, the first duty cycle, the second average current and the second duty cycle, obtain the peak current.
[0078] Specifically, the first average current and the second average current can be measured by a precision ammeter connected in series to the power supply. The gallium nitride RF device includes a gallium nitride amplifier.
[0079] The first duty cycle is expressed as follows:
[0080]
[0081] Among them, dc1 represents the first duty cycle; w1 represents the first pulse width time within a single period (the duration when the pulse signal is at a high level); u1 represents the first off-pulse duration within a single period (the duration when the pulse signal is at a low level);
[0082] The second duty cycle is represented as follows:
[0083]
[0084] Among them, dc2 represents the first duty cycle; w11 represents the second pulse width time within a single period; u11 represents the second off-pulse duration within a single period.
[0085] It should be noted that the first duty cycle dc1 is not equal to the second duty cycle dc2. Whether the first duty cycle dc1 is greater than or less than the second duty cycle dc2 can be processed according to actual needs, and no specific limitation is made in this embodiment.
[0086] See Figure 5 As shown, it is the current characteristic curve diagram under the current collapse of gallium nitride during two radio frequency pulse measurements. It can be seen from the figure that the trends of the current characteristic curve diagrams of the first radio frequency pulse measurement and the second radio frequency pulse measurement are exactly the same. Due to the different duty cycles of the two measurements, the average currents (the first average current and the second average current) of the two measurements are also different. Since the peak currents and the off-pulse average currents of the two measurements are equal, therefore, based on the first average current, the second average current, the first duty cycle, and the second duty cycle, the peak current can be calculated.
[0087] In this embodiment, obtaining the peak current based on the first average current, the first duty cycle, the second average current, and the second duty cycle specifically includes:
[0088] Obtain the relationship between the first average current and the first peak current and the first off-pulse average current of the first radio frequency pulse measurement, as follows:
[0089]
[0090] Among them, I1 represents the first average current; i1 represents the first peak current; i2 represents the first off-pulse average current;
[0091] Obtain the relationship between the second average current and the second peak current and the second off-pulse average current of the second radio frequency pulse measurement, as follows:
[0092]
[0093] Among them, I2 represents the second average current; i11 represents the second peak current; i22 represents the second off-pulse average current;
[0094] Since the input signal amplitudes of the first radio frequency (RF) pulse measurement and the second RF pulse measurement are equal, and the pulse widths are narrow enough not to consider heating, the gain of the gallium nitride (GaN) RF device remains constant. Therefore, the first peak current is equal to the second peak current, i.e., the peak current; the first average current outside the pulse is equal to the second average current outside the pulse, i.e., the average current outside the pulse. Specifically as follows:
[0095]
[0096] Combining equations (1) to (3), the peak current is obtained as follows:
[0097]
[0098] Specifically, the first pulse width time is less than or equal to 2 ms; the second pulse width time is less than or equal to 2 ms.
[0099] See Figure 6 As shown, a method for obtaining the average current outside the pulse of a GaN RF device includes:
[0100] S601, perform a first RF pulse measurement on the GaN RF device to obtain a first average current and a first duty cycle;
[0101] S602, at the same input power, use a pulse signal with the same amplitude to perform a second RF pulse measurement on the GaN RF device to obtain a second average current and a second duty cycle; the first duty cycle is not equal to the second duty cycle;
[0102] S603, based on the first average current, the first duty cycle, the second average current, and the second duty cycle, obtain the average current outside the pulse.
[0103] Specifically, the first average current and the second average current can be obtained through measurement. The GaN RF device includes a GaN amplifier.
[0104] The first duty cycle is expressed as follows:
[0105]
[0106] where dc1 represents the first duty cycle; w1 represents the first pulse width time within a single period (the duration when the pulse signal is at a high level); u1 represents the first duration outside the pulse within a single period (the duration when the pulse signal is at a low level);
[0107] The second duty cycle is expressed as follows:
[0108]
[0109] Wherein, dc2 represents the first duty cycle; w11 represents the second pulse width time within a single period; u11 represents the second out-of-pulse duration within a single period.
[0110] It should be noted that the first duty cycle dc1 is not equal to the second duty cycle dc2. Whether the first duty cycle dc1 is greater than or less than the second duty cycle dc2 can be processed according to actual needs, and no specific limitation is made in this embodiment.
[0111] See Figure 5 As shown, it is the current characteristic curve diagram under the current collapse of gallium nitride during two radio frequency pulse measurements. It can be seen from the figure that the trends of the current characteristic curve diagrams of the first radio frequency pulse measurement and the second radio frequency pulse measurement are exactly the same. Due to the different duty cycles of the two measurements, the average currents (the first average current and the second average current) of the two measurements are also different. Since the peak currents and the out-of-pulse average currents of the two measurements are equal, therefore, based on the first average current, the second average current, the first duty cycle, and the second duty cycle, the out-of-pulse average current can be calculated.
[0112] In this embodiment, obtaining the out-of-pulse average current based on the first average current, the first duty cycle, the second average current, and the second duty cycle specifically includes:
[0113] Obtain the relationship between the first average current and the first peak current and the first out-of-pulse average current of the first radio frequency pulse measurement, as follows:
[0114]
[0115] Wherein, I1 represents the first average current; i1 represents the first peak current; i2 represents the first out-of-pulse average current; dc1 represents the first duty cycle; w1 represents the first pulse width time within a single period; u1 represents the first out-of-pulse duration within a single period;
[0116] Obtain the relationship between the second average current and the second peak current and the second out-of-pulse average current of the second radio frequency pulse measurement, as follows:
[0117]
[0118] Wherein, I2 represents the second average current; i11 represents the second peak current; i22 represents the second out-of-pulse average current; dc2 represents the second duty cycle; w11 represents the second pulse width time within a single period; u11 represents the second out-of-pulse duration within a single period;
[0119] Since the input signal amplitudes of the first radio frequency (RF) pulse measurement and the second RF pulse measurement are equal, and the pulse widths are narrow enough not to consider heat generation, the gain of the gallium nitride (GaN) RF device remains constant. Therefore, the first peak current is equal to the second peak current, i.e., the peak current; the first average current outside the pulse is equal to the second average current outside the pulse, i.e., the average current outside the pulse. Specifically as follows:
[0120]
[0121] Combining equations (1) to (3), the average current outside the pulse is obtained as follows:
[0122]
[0123] Specifically, the first pulse width time is less than or equal to 2 ms; the second pulse width time is less than or equal to 2 ms.
[0124] See Figure 7 As shown, a method for obtaining the GaN RF efficiency includes:
[0125] S701, perform the first RF pulse measurement on the GaN RF device to obtain the first average current and the first duty cycle;
[0126] S702, under the same input power, use a pulse signal with the same amplitude to perform the second RF pulse measurement on the GaN RF device to obtain the second average current and the second duty cycle; the first duty cycle is not equal to the second duty cycle;
[0127] S703, based on the first average current, the first duty cycle, the second average current, and the second duty cycle, obtain the peak current;
[0128] S704, based on the first average current, the first duty cycle, the second average current, the second duty cycle, and the peak current, obtain the GaN RF efficiency.
[0129] Specifically, the first average current and the second average current can be obtained through measurement. The GaN RF device includes a GaN amplifier.
[0130] The first duty cycle is expressed as follows:
[0131]
[0132] where dc1 represents the first duty cycle; w1 represents the first pulse width time within a single period (the duration when the pulse signal is at a high level); u1 represents the first duration outside the pulse within a single period (the duration when the pulse signal is at a low level);
[0133] The second duty cycle is expressed as follows:
[0134]
[0135] Among them, dc2 represents the first duty cycle; w11 represents the second pulse width time within a single period; u11 represents the second pulse-off duration within a single period.
[0136] It should be noted that the first duty cycle dc1 is not equal to the second duty cycle dc2. Whether the first duty cycle dc1 is greater than or less than the second duty cycle dc2 can be processed according to actual needs, and this embodiment does not make specific limitations.
[0137] See Figure 5 As shown, it is the current characteristic curve diagram under the current collapse of gallium nitride during two radio frequency pulse measurements. It can be seen from the figure that the trends of the current characteristic curve diagrams of the first radio frequency pulse measurement and the second radio frequency pulse measurement are exactly the same. Due to the different duty cycles of the two measurements, the average currents (the first average current and the second average current) of the two measurements are also different. Since the peak currents and the pulse-off average currents of the two measurements are equal, therefore, based on the first average current, the second average current, the first duty cycle, and the second duty cycle, the peak current can be calculated. Further, based on the peak current, the dynamic efficiency is calculated.
[0138] In this embodiment, obtaining the peak current based on the first average current, the first duty cycle, the second average current, and the second duty cycle specifically includes:
[0139] Obtain the relationship between the first average current and the first peak current and the first pulse-off average current of the first radio frequency pulse measurement, as follows:
[0140]
[0141] Among them, I1 represents the first average current; i1 represents the first peak current; i2 represents the first pulse-off average current; dc1 represents the first duty cycle; w1 represents the first pulse width time within a single period; u1 represents the first pulse-off duration within a single period;
[0142] Obtain the relationship between the second average current and the second peak current and the second pulse-off average current of the second radio frequency pulse measurement, as follows:
[0143]
[0144] Among them, I2 represents the second average current; i11 represents the second peak current; i22 represents the second pulse-off average current; dc2 represents the second duty cycle; w11 represents the second pulse width time within a single period; u11 represents the second pulse-off duration within a single period;
[0145] Since the input signal amplitudes of the first radio frequency pulse measurement and the second radio frequency pulse measurement are equal, and the pulse widths are relatively narrow so that heat generation is not considered, the gain of the gallium nitride radio frequency device remains constant. Therefore, the first peak current is equal to the second peak current, that is, the peak current; the first average current outside the pulse is equal to the second average current outside the pulse, that is, the average current outside the pulse. Specifically as follows:
[0146]
[0147] Combining equations (1) to (3), the peak current is obtained as follows:
[0148]
[0149] Specifically, based on the first average current, the first duty cycle, the second average current, the second duty cycle, and the peak current, the gallium nitride radio frequency efficiency is obtained as follows:
[0150]
[0151] Preferably, the first pulse width time is less than or equal to 2 ms; the second pulse width time is less than or equal to 2 ms.
[0152] The above is only the specific implementation manner of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification made to the present invention using this concept shall fall within the scope of infringement of the protection scope of the present invention.
[0153] The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art in the technical field, several improvements can be made without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.
Claims
1. A method for obtaining the peak current of a gallium nitride radio frequency, characterized in that, comprising: Performing a first radio frequency pulse measurement on a gallium nitride radio frequency device to obtain a first average current and a first duty cycle; Under the same input power, using a pulse signal with the same amplitude to perform a second radio frequency pulse measurement on the gallium nitride radio frequency device to obtain a second average current and a second duty cycle; The first duty cycle is not equal to the second duty cycle; Based on the first average current, the first duty cycle, the second average current and the second duty cycle, obtaining the peak current; The obtaining the peak current based on the first average current, the first duty cycle, the second average current and the second duty cycle specifically includes: Obtaining the relationship between the first average current and the first peak current and the first off-pulse average current of the first radio frequency pulse measurement, as follows: Where, I1 represents the first average current; i1 represents the first peak current; i2 represents the first off-pulse average current; dc1 represents the first duty cycle; w1 represents the first pulse width time within a single period; u1 represents the first off-pulse duration within a single period; Obtaining the relationship between the second average current and the second peak current and the second off-pulse average current of the second radio frequency pulse measurement, as follows: Where, I2 represents the second average current; i11 represents the second peak current; i22 represents the second off-pulse average current; dc2 represents the second duty cycle; w11 represents the second pulse width time within a single period; u11 represents the second off-pulse duration within a single period; Based on the fact that the input signal amplitudes of the first radio frequency pulse measurement and the second radio frequency pulse measurement are equal, and the gain of the gallium nitride radio frequency device is constant, it can be obtained that the first peak current is equal to the second peak current, that is, the peak current; the first off-pulse average current is equal to the second off-pulse average current, that is, the off-pulse average current; specifically as follows: Combining Equation (1) to Equation (3), obtaining the peak current, as follows:
2. The method for obtaining the peak current of a gallium nitride radio frequency according to claim 1, characterized in that, The first pulse width time is less than or equal to 2 ms; the second pulse width time is less than or equal to 2 ms.
3. A method for obtaining the off-pulse average current of a gallium nitride radio frequency, characterized in that, comprising: Performing a first radio frequency pulse measurement on a gallium nitride radio frequency device to obtain a first average current and a first duty cycle; Under the same input power, using a pulse signal with the same amplitude to perform a second radio frequency pulse measurement on the gallium nitride radio frequency device to obtain a second average current and a second duty cycle; The first duty cycle is not equal to the second duty cycle; Based on the first average current, the first duty cycle, the second average current and the second duty cycle, obtaining the off-pulse average current; The obtaining the off-pulse average current based on the first average current, the first duty cycle, the second average current and the second duty cycle specifically includes: Obtaining the relationship between the first average current and the first peak current and the first off-pulse average current of the first radio frequency pulse measurement, as follows: Among them, I1 represents the first average current; i1 represents the first peak current; i2 represents the first off-pulse average current; dc1 represents the first duty cycle; w1 represents the first pulse width time within a single period; u1 represents the first off-pulse duration within a single period. Obtain the relationship between the second average current and the second peak current and the second off-pulse average current measured by the radio frequency pulse for the second time, as follows: Among them, I2 represents the second average current; i11 represents the second peak current; i22 represents the second off-pulse average current; dc2 represents the second duty cycle; w11 represents the second pulse width time within a single period; u11 represents the second off-pulse duration within a single period. Based on the fact that the input signal amplitudes of the first measurement of the radio frequency pulse and the second measurement of the radio frequency pulse are equal, and the gain of the gallium nitride radio frequency device is constant, it can be obtained that the first peak current is equal to the second peak current, that is, the peak current; the first off-pulse average current is equal to the second off-pulse average current, that is, the off-pulse average current. Specifically as follows: Combining formulas (1) to (3), obtain the off-pulse average current, as follows:
4. The method for obtaining the off-pulse average current of the gallium nitride radio frequency according to claim 3, characterized in that the first pulse width time is less than or equal to 2 ms; the second pulse width time is less than or equal to 2 ms.
5. A method for obtaining the efficiency of a gallium nitride radio frequency, characterized in that comprising: Performing a first measurement of the radio frequency pulse on the gallium nitride radio frequency device to obtain the first average current and the first duty cycle; Under the same input power, using a pulse signal with the same amplitude to perform a second measurement of the radio frequency pulse on the gallium nitride radio frequency device to obtain the second average current and the second duty cycle; the first duty cycle is not equal to the second duty cycle; Based on the first average current, the first duty cycle, the second average current, and the second duty cycle, obtain the peak current; Based on the first average current, the first duty cycle, the second average current, the second duty cycle, and the peak current, obtain the efficiency of the gallium nitride radio frequency; The obtaining the peak current based on the first average current, the first duty cycle, the second average current, and the second duty cycle specifically includes: Obtain the relationship between the first average current and the first peak current and the first off-pulse average current measured by the first measurement of the radio frequency pulse, as follows: Among them, I1 represents the first average current; i1 represents the first peak current; i2 represents the first off-pulse average current; dc1 represents the first duty cycle; w1 represents the first pulse width time within a single period; u1 represents the first off-pulse duration within a single period. Obtain the relationship between the second average current and the second peak current and the second off-pulse average current measured by the second measurement of the radio frequency pulse, as follows: Among them, I2 represents the second average current; i11 represents the second peak current; i22 represents the second off-pulse average current; dc2 represents the second duty cycle; w11 represents the second pulse width time within a single period; u11 represents the second off-pulse duration within a single period. Based on the fact that the input signal amplitudes of the first radio frequency pulse measurement and the second radio frequency pulse measurement are equal, and the gain of the gallium nitride radio frequency device is constant, it can be obtained that the first peak current is equal to the second peak current, that is, the peak current; the first average current outside the pulse is equal to the second average current outside the pulse, that is, the average current outside the pulse; specifically as follows: Combining equations (1) to (3), the peak current is obtained as follows: Based on the first average current, the first duty cycle, the second average current, the second duty cycle, and the peak current, the gallium nitride radio frequency efficiency is obtained as follows:
6. The method for obtaining the gallium nitride radio frequency efficiency according to claim 5, characterized in that the first pulse width time is less than or equal to 2 ms; the second pulse width time is less than or equal to 2 ms.
Citation Information
Patent Citations
LED instantaneous light flux test method and apparatus in PWM activation technology
CN101430223A
Load driving controller
CN108111017A