CN111147029A - Radio frequency power amplification device and radio frequency power amplification method for 5G-NR frequency band - Google Patents
Radio frequency power amplification device and radio frequency power amplification method for 5G-NR frequency band Download PDFInfo
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Abstract
The invention relates to a radio frequency power amplification device for a 5G-NR frequency band, which comprises a first phase adjuster, a first power amplifier, a second power amplifier and a second phase adjuster, wherein the first phase adjuster, the second power amplifier and the second phase adjuster are used for amplifying radio frequency signals. The invention also relates to a radio frequency power amplification method for the 5G-NR frequency band. Experiments show that the radio frequency power amplification device and the radio frequency power amplification method for the 5G-NR frequency band can effectively improve the linear power of the radio frequency power amplifier by 2.5dB, thereby meeting the system requirement of 5G-NR.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a radio frequency power amplification device and a radio frequency power amplification method for a 5G-NR frequency band.
Background
The 5G-NR (5th-Generation New Radio, 5G New air interface) is a global 5G standard based on a brand-New air interface design of OFDM, and is also a very important cellular mobile technology basis of the next Generation, and the 5G technology can realize ultra-low time delay and high reliability. One major advantage of 5G networks is that data transmission rates are much higher than previous cellular networks, up to 10Gbit/s, faster than current wired internet, 100 times faster than previous 4G LTE (Long Term Evolution) cellular networks. Another advantage is lower network delay (faster response time), below 1 millisecond, and 30-70 milliseconds for 4G.
The 5G-NR adopts ultra-wide radio frequency transmission bandwidth, and the bandwidth of the N41 frequency band can reach 100MHz which is 10 times of the traditional 4G bandwidth. In order for the rf power amplifier to effectively transmit signals at such a high bandwidth in 5G-NR applications, the linear power of the rf power amplifier must be further increased.
Fig. 1 is a schematic structural diagram of a radio frequency power amplifying device in the prior art. In fig. 1, the radio frequency power amplifying device includes a radio frequency input port P11, a radio frequency output port P12, a power amplifier PA11, an input matching network formed by a power supply SRC11 of the power amplifier PA11, capacitors C11, C12, and an inductor L11, and an output matching network formed by inductors L12, L13, and capacitors C13, C14, and C15. The input matching network functions to match a preset impedance value (e.g., 50 ohms) (point 1) of the rf input port P11 to the input impedance point (point 2) of the power amplifier PA11, and the output matching network functions to match a preset impedance value (e.g., 50 ohms) (point 6) of the rf output port P12 in stages (points 5 and 4) to the output impedance point (point 3) of the power amplifier PA 11. The power amplifier PA11 may be a currently available amplifier, such as μ a741, LM358, LM324, etc.
At present, the power amplifier aiming at the 5G-NR system is designed on a conventional power amplifier circuit, and the linearity of the power amplifier is improved by reducing an output matching impedance point and increasing the power amplifier supply voltage so as to meet the linearity requirement of the 5G-NR. Reducing the output impedance matching point narrows the output bandwidth of the power amplifier and does not meet the linearity requirement of the whole bandwidth. Increasing the supply voltage of the power amplifier increases the power consumption of the entire power amplifier on the one hand, and decreases the reliability of the entire power amplifier on the other hand, which is more vulnerable to damage at high voltages.
Therefore, in the conventional design of reducing the output matching impedance point and increasing the power supply voltage of the power amplifier in the prior art, the linear power is increased only limitedly, and the reliability is reduced to some extent due to the heating aggravation after the power is increased, so that the requirement of a 5G-NR system cannot be met. Therefore, it is very urgent to develop a new rf power amplifying device to boost the linear power.
Disclosure of Invention
Therefore, the radio frequency power amplifying device and the radio frequency power amplifying method for the 5G-NR frequency band are provided, two phase regulators are adopted for any stage of amplifying circuit of the radio frequency power amplifying device to respectively carry out phase regulation, signal splitting, phase recovery and signal combination on radio frequency signals, and the linear power of the radio frequency power amplifier can be effectively improved.
According to a first aspect of the present invention, there is provided an rf power amplifying device for a 5G-NR frequency band, comprising a first phase adjuster, a first power amplifier, a second power amplifier and a second phase adjuster, wherein:
the first phase adjuster comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first inductor, a second inductor, a third inductor and a first resistor, wherein a first end of the first capacitor is connected with a first end of the first inductor and used for receiving an input radio frequency signal, and a second end of the first capacitor is connected with a first end of the second inductor and a first end of the second capacitor; the second end of the second capacitor is connected with the first end of the first resistor and the first end of the third inductor, and the second end of the first resistor is grounded; the third inductor second terminal is connected to the third capacitor first terminal and the base of the second power amplifier, the third capacitor second terminal is connected to the second inductor second terminal and the fourth capacitor first terminal; a second end of the fourth capacitor is connected with a second end of the first inductor and a base of the first power amplifier;
the second phase adjuster comprises a fourth inductor, a fifth inductor, a sixth inductor, a seventh point inductor, a fifth capacitor, a sixth capacitor, a seventh capacitor and a second resistor, wherein a first end of the fourth inductor is connected with a first end of the fifth capacitor and the emitter of the first power amplifier, and a second end of the fourth inductor is connected with a first end of the fifth inductor and a first end of the sixth capacitor; a second end of the fifth inductor is connected to a first end of the seventh capacitor and an emitter of the second power amplifier, a second end of the seventh capacitor is connected to a first end of the second resistor and a first end of the sixth inductor, and a second end of the second resistor is grounded; the sixth inductor second end is connected with the second end of the sixth capacitor and the first end of the seventh inductor; a second end of the seventh inductor is connected with a second end of the fifth capacitor.
According to a second aspect of the present invention, there is provided a method of radio frequency power amplification implemented by the radio frequency power amplification device according to the first aspect, comprising:
the first phase adjuster receives an input radio frequency signal and divides the input radio frequency signal into a first path of signal and a second path of signal, wherein the phase difference between the first path of signal and the second path of signal is 90 degrees;
the first power amplifier receives the first path of signal and amplifies the first path of signal to obtain a processed first path of signal;
the second power amplifier receives the second path of signals and amplifies the second path of signals to obtain a processed second path of signals;
and the second phase adjuster receives the processed first path of signal and the processed second path of signal, adjusts the phases of the processed first path of signal and the processed second path of signal to be consistent and combined, obtains and outputs the combined signal.
Experiments show that the radio frequency power amplification device and the radio frequency power amplification method for the 5G-NR frequency band can effectively improve the linear power of the radio frequency power amplifier by 2.5dB, thereby meeting the system requirement of 5G-NR.
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For further clarity of explanation of the features and technical content of the present invention, reference should be made to the following detailed description of the present invention and accompanying drawings, which are provided for reference and description purposes only and are not intended to limit the present invention.
In the following drawings:
fig. 1 is a schematic structural diagram of a radio frequency power amplifying device in the prior art.
Fig. 2 is a schematic structural diagram of an rf power amplifying device according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a radio frequency power amplifying device according to another embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a radio frequency power amplifying device according to yet another embodiment of the present invention.
Detailed Description
The embodiments of the present invention disclosed are described below with reference to specific embodiments, and those skilled in the art can understand the advantages and effects of the present invention from the disclosure of the present specification. The invention is capable of other and different embodiments and its several details are capable of modification and various other changes, which can be made in various details within the specification and without departing from the spirit and scope of the invention. The drawings of the present invention are for illustrative purposes only and are not drawn to scale. The following embodiments will further explain the related art of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.
According to one aspect of the invention, the invention provides a radio frequency power amplification device for a 5G-NR frequency band, wherein two phase adjusters are adopted for any stage of amplification circuit of the radio frequency power amplification device to respectively carry out phase adjustment, signal splitting, phase recovery and signal combination on a radio frequency signal, so that the linear power of a radio frequency power amplifier can be effectively improved.
Fig. 2 is a schematic structural diagram of an rf power amplifying device according to an embodiment of the present invention. As shown in fig. 2, the radio frequency power amplifying device includes a radio frequency input port P21, a radio frequency output port P22, a first power amplifier PA21, a power supply SRC21 of the first power amplifier PA21, a second power amplifier PA22, and a power supply SRC22 of the second power amplifier PA22, where both voltages of the power supply SRC21 and the power supply SRC22 are Vdc-4.2V. Collectors of the first power amplifier PA21 and the second power amplifier PA22 are connected to a power supply SRC21 and a power supply SRC22, respectively. The radio frequency power amplifying device further includes a first phase adjuster a21 and a second phase adjuster a 22.
As shown in fig. 2, the first phase adjuster a21 includes a first capacitor C21, a second capacitor C22, a third capacitor C23, a fourth capacitor C24, a first inductor L21, a second inductor L22, a third inductor L23, and a first resistor R21, a first end of the first capacitor C21 is connected to a first end of the first inductor L21 for receiving an input radio frequency signal, and a second end of the first capacitor C21 is connected to a first end of the second inductor L22 and a first end of the second capacitor C22; the second end of the second capacitor C22 is connected to the first end of the first resistor R21 and the first end of the third inductor L23, and the second end of the first resistor R21 is grounded; a second end of the third inductor L23 is connected to a first end of the third capacitor C23 and the base of the second power amplifier PA22, a second end of the third capacitor C23 is connected to a second end of the second inductor L22 and a first end of the fourth capacitor C24; a second terminal of the fourth capacitor C24 is connected with a second terminal of the first inductor L21 and the base of the first power amplifier PA 21.
As shown in fig. 2, the second phase adjuster a22 includes a fourth inductor L24, a fifth inductor L25, a sixth inductor L26, a seventh point inductor L27, a fifth capacitor C25, a sixth capacitor C26, a seventh capacitor C27, and a second resistor R22, a first end of the fourth inductor L24 is connected to a first end of the fifth capacitor C25 and an emitter of the first power amplifier PA21, and a second end of the fourth inductor L24 is connected to a first end of the fifth inductor L25 and a first end of the sixth capacitor C26; a second end of the fifth inductor L25 is connected to a first end of the seventh capacitor C27 and the emitter of the second power amplifier PA22, a second end of the seventh capacitor C27 is connected to a first end of the second resistor R22 and a first end of the sixth inductor L26, and a second end of the second resistor R22 is grounded; the sixth inductor L26 second terminal is connected with the second terminal of the sixth capacitor C26 and the first terminal of the seventh inductor L27; a second terminal of the seventh inductor L27 is connected with a second terminal of the fifth capacitor C25.
In the embodiment shown in fig. 2, the first capacitor C21, the second capacitor C22, the third capacitor C23, the fourth capacitor C24, the first inductor L21, the second inductor L22, the third inductor L23 and the first resistor R21 included in the first phase adjuster a21 form an input matching network, match a preset impedance value (e.g., 50 ohms) (point 1) of the radio frequency input port P21 to input impedances (point 2 and point 3) of the first power amplifier PA21 and the second power amplifier PA22, and divide an input signal of the radio frequency input port P21 into two signals, which are respectively input to the first power amplifier PA21 and the second power amplifier PA22, and the phase difference of the two signals is 90 °.
In the embodiment shown in fig. 2, the fourth inductor L24, the fifth inductor L25, the sixth inductor L26, the seventh point inductor L27, the fifth capacitor C25, the sixth capacitor C26, the seventh capacitor C27, and the second resistor R22 included in the second phase adjuster a22 constitute an output matching network, which restores the two signals with a phase difference of 90 ° to be in phase agreement, combines the two signals into one, and matches the output impedances (point 4 and point 5) of the first power amplifier PA21 and the second power amplifier PA22 to a preset impedance value (e.g., 50 ohms) of the rf output port P22 (point 6).
In an alternative embodiment, the positions of the first phase adjuster a21 and the second phase adjuster a22 may be interchanged, i.e., the second phase adjuster a22 constitutes an input matching network and the first phase adjuster a21 constitutes an output matching network.
Fig. 3 is a schematic structural diagram of a radio frequency power amplifying device according to another embodiment of the present invention. As shown in fig. 3, compared to fig. 2, in fig. 3, the rf power amplifying apparatus includes a first matching circuit M31 and a second matching circuit M32 in addition to the rf input port P31, the rf output port P32, the first power amplifier PA31, the power supply SRC31 of the first power amplifier PA31, the second power amplifier PA32, the power supply SRC32 of the second power amplifier PA32, the first phase adjuster a31, and the second phase adjuster a 32. The first matching circuit M31 includes an eighth capacitor C38 and an eighth inductor L38, the second matching circuit M32 includes a ninth capacitor C39 and a ninth inductor L39, wherein a first end of the eighth capacitor C38 is connected to the emitter of the first power amplifier PA31, a second end of the eighth capacitor C38 is connected to a first end of an eighth inductor L38, a first end of the fourth inductor L34, and a first end of the fifth capacitor C35, and a second end of the eighth inductor L38 is grounded; a first terminal of the ninth capacitor C39 is connected to the emitter of the second power amplifier PA32, a second terminal of the ninth capacitor C39 is connected to a first terminal of the ninth inductor L39, a first terminal of the seventh capacitor C37 and a second terminal of the fifth inductor L35, and a second terminal of the ninth inductor L39 is grounded.
In the embodiment shown in fig. 3, the second phase adjuster a32, the first matching circuit M31, and the second matching circuit M32 form an output matching network, the second phase adjuster a32 restores two signals having a phase difference of 90 ° to be in phase agreement, and combines the two signals into one signal, the first matching circuit M31 and the second matching circuit M32 respectively match the output impedances (point 4 and point 5) of the first power amplifier PA31 and the second power amplifier PA32 to one impedance value (e.g., 20 ohms), and the second phase adjuster a32 matches the output impedances (point 7 and point 8) of the first power amplifier PA31 and the second power amplifier PA32 to a preset impedance value (e.g., 50 ohms) of the rf output port P32 (point 6).
In an alternative embodiment, in fig. 3, the radio frequency power amplifying device further includes a third matching circuit M33, and the third matching circuit M33 includes a tenth capacitor C3X and a tenth inductor L3X. A first end of the tenth inductor L3X is connected to the second end of the fifth capacitor C35 and the second end of the seventh inductor L37, a second end of the tenth inductor L3X is connected to the first end of the tenth capacitor C3X, and a second end of the tenth capacitor C3X is grounded.
In the embodiment shown in fig. 3, the second phase adjuster a32, the first matching circuit M31, the second matching circuit M32, and the third matching circuit M33 form an output matching network, the second phase adjuster a32 restores the two signals having a phase difference of 90 ° from the first power amplifier PA31 and the second power amplifier PA32 to be in phase agreement and combines the signals into one, the first matching circuit M31 and the second matching circuit M32 match the output impedances (point 4 and point 5) of the first power amplifier PA31 and the second power amplifier PA32 to a first intermediate impedance value (e.g., 15 ohms), respectively, the second phase adjuster a32 matches the output impedances (point 7 and point 8) of the first power amplifier PA31 and the second power amplifier PA32 to a second intermediate impedance value (e.g., 30 ohms) (point 6), the third matching circuit M33 matches the output impedance to a preset impedance value (e.g., 50 ohms) (point 9).
In addition to the three-stage output impedance matching method shown in fig. 3, a more-stage output matching method may be adopted. Furthermore, the circuit configuration of the first matching circuit M31, the second matching circuit M32, and the third matching circuit M33 is not limited to the specific manner shown in fig. 3, that is, the device selection, the device connection, and the number of devices shown in fig. 3, and as long as the output impedance can be matched to a preset value, those skilled in the art may adopt various circuit configurations, which all fall within the scope of the present disclosure.
In another alternative embodiment, the rf power amplifying device may further include more stages of signal amplifying components in order to obtain a greater amplification gain. Fig. 4 is a schematic structural diagram of a radio frequency power amplifying device according to yet another embodiment of the present invention. Compared with fig. 2, in fig. 4, the rf power amplifying apparatus includes a first group of power amplifiers PA40 in addition to the rf input port P41, the rf output port P42, the first power amplifier PA41, the power supply SRC41 of the first power amplifier PA41, the second power amplifier PA42, the power supply SRC42 of the second power amplifier PA42, the first phase adjuster a41, and the second phase adjuster a 42. In fig. 4, the first group of power amplifiers PA40 is a power amplifier. According to an alternative embodiment, the first group of power amplifiers PA40 may include a plurality of power amplifiers connected in series. The first group PA40 is connected to a first end of the first capacitor C41 of the first phase adjuster a41 and a first end of the first inductor L41, and the first group PA40 amplifies an input rf signal and transmits the amplified rf signal to the first phase adjuster a 41.
In the structural diagram of the rf power amplifying device shown in fig. 4, the power amplifier is disposed before the input matching network (i.e., the first phase adjuster a41), and in an alternative embodiment, the power amplifier may be disposed after the output matching network (e.g., the second phase adjuster a 42). Thus, optionally, the rf power amplifying apparatus further includes a second group of power amplifiers, and the second group of power amplifiers is connected to the second end of the fifth capacitor C45 of the second phase adjuster a42 and the second end of the seventh inductor L47, and is configured to amplify the rf signal processed by the second phase adjuster a42 and outputted. In addition, optionally, the second group of power amplifiers includes one power amplifier or a plurality of power amplifiers connected in series.
In another alternative embodiment, the power amplifier may be placed before the input matching network (i.e., the first phase adjuster a41) and after the output matching network (e.g., the second phase adjuster a 42).
According to another aspect of the present invention, two phase adjusters are adopted for any stage of an amplifying circuit of the rf power amplifying apparatus to perform phase adjustment, signal splitting, phase recovery, and signal combining on the rf signal, so as to effectively improve the linear power of the rf power amplifier.
According to a specific embodiment, the rf power amplifying apparatus according to fig. 2 implements an rf power amplifying method, including the following steps:
the first phase adjuster a21 receives an input radio frequency signal, and divides the input radio frequency signal into a first path of signal and a second path of signal, where the phase difference between the first path of signal and the second path of signal is 90 °;
the first power amplifier PA21 receives the first signal, and amplifies the first signal to obtain a processed first signal;
the second power amplifier PA22 receives the second path of signal, and amplifies the second path of signal to obtain a processed second path of signal;
and the second phase adjuster A22 receives the processed first path of signal and the processed second path of signal, adjusts the phases of the processed first path of signal and the processed second path of signal to be consistent and combined, obtains a combined signal and outputs the combined signal.
According to the rf power amplifying apparatus and the rf power amplifying method of the present invention, taking two N40 and N41 frequency bands of 5G-NR as an example, the collector voltage Vdc is 4.2V, and the simulation results are shown in table 1:
TABLE 1
As can be seen from table 1, the radio frequency power amplifying device and the radio frequency power amplifying method provided by the present invention can achieve a compression point power of 1dB above 35.3dBm, which is about 2.5dB higher than that of the conventional radio frequency power amplifying device.
Therefore, experiments show that the radio frequency power amplification device and the radio frequency power amplification method for the 5G-NR frequency band can effectively improve the linear power of the radio frequency power amplifier by 2.5dB, thereby meeting the system requirement of 5G-NR.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An rf power amplifying apparatus for a 5G-NR frequency band, comprising a first phase adjuster, a first power amplifier, a second power amplifier, and a second phase adjuster, wherein:
the first phase adjuster comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first inductor, a second inductor, a third inductor and a first resistor, wherein a first end of the first capacitor is connected with a first end of the first inductor and used for receiving an input radio frequency signal, and a second end of the first capacitor is connected with a first end of the second inductor and a first end of the second capacitor; the second end of the second capacitor is connected with the first end of the first resistor and the first end of the third inductor, and the second end of the first resistor is grounded; the third inductor second terminal is connected to the third capacitor first terminal and the base of the second power amplifier, the third capacitor second terminal is connected to the second inductor second terminal and the fourth capacitor first terminal; a second end of the fourth capacitor is connected with a second end of the first inductor and a base of the first power amplifier;
the second phase adjuster comprises a fourth inductor, a fifth inductor, a sixth inductor, a seventh point inductor, a fifth capacitor, a sixth capacitor, a seventh capacitor and a second resistor, wherein a first end of the fourth inductor is connected with a first end of the fifth capacitor and the emitter of the first power amplifier, and a second end of the fourth inductor is connected with a first end of the fifth inductor and a first end of the sixth capacitor; a second end of the fifth inductor is connected to a first end of the seventh capacitor and an emitter of the second power amplifier, a second end of the seventh capacitor is connected to a first end of the second resistor and a first end of the sixth inductor, and a second end of the second resistor is grounded; the sixth inductor second end is connected with the second end of the sixth capacitor and the first end of the seventh inductor; a second end of the seventh inductor is connected with a second end of the fifth capacitor.
2. The radio frequency power amplifying device according to claim 1, further comprising a first matching circuit and a second matching circuit, wherein the first matching circuit comprises an eighth capacitor and an eighth inductor, the second matching circuit comprises a ninth capacitor and a ninth inductor, wherein a first end of the eighth capacitor is connected to the emitter of the first power amplifier, a second end of the eighth capacitor is connected to a first end of the eighth inductor, a first end of the fourth inductor, and a first end of the fifth capacitor, and a second end of the eighth inductor is connected to ground; a first end of the ninth capacitor is connected to the emitter of the second power amplifier, a second end of the ninth capacitor is connected to the first end of the ninth inductor, the first end of the seventh capacitor, and the second end of the fifth inductor, and the second end of the ninth inductor is grounded.
3. The radio frequency power amplifying device according to claim 1 or 2, further comprising a third matching circuit, wherein the third matching circuit comprises a tenth capacitor and a tenth inductor, a first end of the tenth inductor is connected with a second end of the fifth capacitor and a second end of the seventh inductor, a second end of the tenth inductor is connected with a first end of the tenth capacitor, and a second end of the tenth capacitor is grounded.
4. The radio frequency power amplification device of claim 1, further comprising a first set of power amplifiers connected to the first end of the first capacitor and the first end of the first inductor.
5. The radio frequency power amplification device of claim 4, wherein the first group of power amplifiers comprises one power amplifier or a plurality of power amplifiers connected in series.
6. The radio frequency power amplification device of claim 1 or 4, further comprising a second set of power amplifiers connected to a second terminal of the fifth capacitor and a second terminal of the seventh inductor.
7. The radio frequency power amplification device of claim 6, wherein the second group of power amplifiers comprises one power amplifier or a plurality of power amplifiers connected in series.
8. A method of radio frequency power amplification implemented with the radio frequency power amplification apparatus of claim 1, comprising:
the first phase adjuster receives an input radio frequency signal and divides the input radio frequency signal into a first path of signal and a second path of signal, wherein the phase difference between the first path of signal and the second path of signal is 90 degrees;
the first power amplifier receives the first path of signal and amplifies the first path of signal to obtain a processed first path of signal;
the second power amplifier receives the second path of signals and amplifies the second path of signals to obtain a processed second path of signals;
and the second phase adjuster receives the processed first path of signal and the processed second path of signal, adjusts the phases of the processed first path of signal and the processed second path of signal to be consistent and combined, obtains and outputs the combined signal.
9. The method of claim 8, wherein the radio frequency power amplification device further comprises a first set of power amplifiers connected to a first end of the first capacitor and a first end of the first inductor of the first phase adjuster, the method further comprising: the first group of power amplifiers amplifies input radio frequency signals and sends the amplified signals to the first phase adjuster.
10. The method of claim 8 or 9, wherein the radio frequency power amplifying device further comprises a second set of power amplifiers connected to a second terminal of the fifth capacitor of the second phase adjuster and a second terminal of the seventh inductor, the method further comprising: the second group of power amplifiers amplifies signals output by the second group of power amplifiers.
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| CN109842380A (en) * | 2017-11-28 | 2019-06-04 | 锐迪科微电子（上海）有限公司 | A kind of power amplification circuit for realizing HPUE |
| CN208782780U (en) * | 2018-07-04 | 2019-04-23 | 深圳科立讯通信有限公司 | Power amplification circuit |
| CN211296685U (en) * | 2020-01-22 | 2020-08-18 | 深圳飞骧科技有限公司 | Radio frequency power amplifying device for 5G-NR frequency band |
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