CN111245379A - Balanced or differential amplifier, power amplifying method and radio frequency circuit - Google Patents
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- H—ELECTRICITY
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- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
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Abstract
The application discloses a balanced or differential amplifier, which comprises an input switch, wherein at least one radio frequency signal is coupled to the input switch, and one end of the input switch is coupled to a first isolation end; a first coupler having first and second ends connected to the input switch; first and second power amplifiers, the first power amplifier coupled to the third terminal of the first coupler, the second power amplifier coupled to the fourth terminal of the first coupler; and a first end and a second end of the second coupler are respectively coupled to the first power amplifier and the second power amplifier, and an output switch is respectively connected to the second coupler and outputs the amplified at least one radio frequency signal to at least one radio frequency antenna, wherein one end of the output switch is coupled to the second isolation end.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a balanced or differential amplifier, a power amplification method for a radio frequency signal, and a radio frequency circuit.
Background
In a traditional radio frequency power amplifier, a balance amplifier and a differential amplifier exist, the amplifier divides an input signal into two paths, the two paths are respectively amplified in two single-ended amplifiers, and then power synthesis is realized at an output end. The structure can realize higher output power, and the balanced amplifier has the performances of insensitivity to output load and the like. In wireless communication, in order to increase the uploading or downloading rate, a Multiple Input Multiple Output (MIMO) scheme is currently adopted, and each path of transmitting and receiving path has a set of independent transmitting power amplifier, switch, filter and receiving low noise amplifier. For example, the current 5G mobile terminal generally requires to support 2-way uplink transmission and 4-way download reception (2T4R), WiFi6 requires to support 8-way uplink transmission and 8-way download reception (8T8R), and the number of radio frequency paths and radio frequency devices is greatly increased.
Disclosure of Invention
The invention aims to provide a balanced or differential amplifier, which saves radio frequency paths and devices of MIMO and improves the transmitting power.
In one embodiment of the present application, there is provided a balanced or differential amplifier comprising:
an input switch, wherein at least one radio frequency signal is coupled to the input switch, and one end of the input switch is coupled to a first isolation end;
a first coupler having first and second ends connected to the input switch;
first and second power amplifiers, the first power amplifier coupled to the third terminal of the first coupler, the second power amplifier coupled to the fourth terminal of the first coupler;
a second coupler having first and second terminals coupled to the first and second power amplifiers, respectively,
and the output switches are respectively connected with the second couplers and respectively output the amplified at least one radio frequency signal to at least one radio frequency antenna, wherein one end of each output switch is coupled with a second isolation end.
In a preferred embodiment, two rf signals are respectively coupled to the input switch, the first coupler divides the two rf signals into two signals having a phase difference and respectively outputs the two signals of the two rf signals to the first and second power amplifiers, the first and second power amplifiers respectively amplify the two signals of the two rf signals, the second coupler respectively synthesizes the two signals of the two rf signals, and the output switch respectively outputs the synthesized two rf signals to a single rf antenna.
In a preferred embodiment, a radio frequency signal is coupled to the input switch, the first coupler divides the radio frequency signal into two paths of signals with phase difference and outputs the two paths of signals of the radio frequency signal to the first and second power amplifiers, the first and second power amplifiers amplify the two paths of signals of the radio frequency signal, the second coupler synthesizes the two paths of signals of the radio frequency signal, and the output switch outputs the synthesized radio frequency signal to a radio frequency antenna.
In a preferred embodiment, the first coupler divides one path of radio frequency signal into two paths of signals with a phase difference of 90 ° or 180 °, and the second coupler combines the two paths of signals with a phase difference of 90 ° or 180 ° into one path of radio frequency signal.
In a preferred embodiment, the first and second isolated terminals are coupled to ground through a resistor, a capacitor, an inductor, or a combination thereof.
Another embodiment of the present application further provides a method for amplifying power of a radio frequency signal, including:
inputting at least one radio frequency signal into at least an input switch, outputting the at least one radio frequency signal through the input switch to first and second terminals of a first coupler;
the first coupler splits at least one of the at least one radio frequency signal;
the first and second power amplifiers are respectively used for amplifying one of the at least one radio frequency signal and outputting the amplified at least one radio frequency signal to a first end and a second end of a second coupler;
the second coupler synthesizes the amplified at least one radio frequency signal;
and outputting the synthesized at least one radio frequency signal to at least one radio frequency antenna through an output switch respectively.
In a preferred embodiment, the at least one radio frequency signal is input to the first coupler with half power, the first coupler divides the at least one radio frequency signal into two signals having a phase difference and outputs the two signals of the at least one radio frequency signal to the first and second power amplifiers, the first and second power amplifiers amplify the two signals of the at least one radio frequency signal, the second coupler synthesizes the two signals of the at least one radio frequency signal, and the output switch outputs the synthesized at least one radio frequency signal to the at least one radio frequency antenna.
In a preferred embodiment, one end of the input switch is coupled to a first isolation terminal, and the first isolation terminal is coupled to a ground terminal through a resistor, a capacitor, an inductor, or a combination thereof.
In a preferred embodiment, one end of the output switch is coupled to a second isolation terminal, and the second isolation terminal is coupled to a ground terminal through a resistor, a capacitor, an inductor, or a combination thereof.
In another embodiment of the present application, there is also provided a radio frequency circuit, including: in the balanced or differential amplifier, the output switch is further connected to the first receiving branch and the second receiving branch, and the output switch is coupled to the at least one rf antenna through a filter.
Compared with the prior art, the method has the following beneficial effects:
the application provides a novel power amplification method for radio frequency signals supporting double antennas, which can be used for double-frequency transmission or 2 x 2MIMO radio frequency channels and devices, and achieves the purposes of reducing the front end volume of a radio frequency module and saving the cost. The method can be used for single-frequency, dual-frequency 1 x 1 or 2 x 2MIMO transmission and reception, and can also be extended to multi-path MIMO. -
The present specification describes a number of technical features distributed throughout the various technical aspects, and if all possible combinations of technical features (i.e. technical aspects) of the present specification are listed, the description is made excessively long. In order to avoid this problem, the respective technical features disclosed in the above summary of the invention of the present application, the respective technical features disclosed in the following embodiments and examples, and the respective technical features disclosed in the drawings may be freely combined with each other to constitute various new technical solutions (which should be said to have been described in the present specification), unless such a combination of technical features is technically infeasible. For example, in one example, the feature a + B + C is disclosed, in another example, the feature a + B + D + E is disclosed, and the features C and D are equivalent technical means for the same purpose, and technically only one feature is used, but not simultaneously employed, and the feature E can be technically combined with the feature C, then the solution of a + B + C + D should not be considered as being described because the technology is not feasible, and the solution of a + B + C + E should be considered as being described.
Drawings
Fig. 1 is a circuit schematic of a balanced or differential amplifier in an embodiment of the invention.
Fig. 2 is a circuit schematic of a balanced or differential amplifier in another embodiment of the invention.
Fig. 3 is a circuit schematic of a balanced or differential amplifier in another embodiment of the invention.
Fig. 4 is a flowchart of a method for amplifying power of an rf signal according to an embodiment of the invention.
Fig. 5 is a circuit diagram of an rf circuit according to an embodiment of the invention.
Detailed Description
In the following description, numerous technical details are set forth in order to provide a better understanding of the present application. However, it will be understood by those skilled in the art that the technical solutions claimed in the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
In this embodiment, a balanced or differential amplifier is provided, a schematic diagram of which is shown in fig. 1, and the balanced or differential amplifier includes:
an input switch 401, wherein at least one radio frequency signal is coupled to the input switch 401, and one end of the input switch 401 is coupled to a first isolation end;
a first coupler 402, a first and a second terminal of the first coupler 402 being connected to the input switch 401;
first and second power amplifiers 403, 404, the first power amplifier 403 being coupled to the third terminal of the first coupler 402, the second power amplifier 404 being coupled to the fourth terminal of the first coupler 402,
a second coupler 405, a first and a second terminal of the second coupler 405 being coupled to the first and the second power amplifier 403, 404, respectively,
and output switches 406, where the output switches 406 are respectively connected to the second couplers 405, and respectively output the amplified at least one radio frequency signal to at least one radio frequency antenna, where one end of the output switch 406 is coupled to a second isolation end.
In one embodiment, the first and second terminals of the first coupler are used as signal input terminals, and the third and fourth terminals are used as through output terminals and coupled output terminals, respectively, wherein the through output terminals have no phase shift and the coupled output terminals have a phase shift. When the dual-band coupler is used for a single-frequency device, the first end and the second end of the first coupler are respectively coupled with two radio-frequency signals. In one embodiment, the first terminal and the second terminal of the second coupler are respectively used as two signal input terminals, and the second coupler further comprises a third terminal and a fourth terminal, and the third terminal and the fourth terminal are used as coupling output terminals. When the double-frequency coupler is used for a single-frequency device, one of the third end and the fourth end of the second coupler is coupled with the isolation end, and when the double-frequency coupler is used for a double-frequency device, the third end and the fourth end of the second coupler are respectively coupled with the two output ends.
In a preferred embodiment, the first coupler 402 splits one rf signal into two signals with a phase difference of 90 ° or 180 °, and the rf signal is split into two signals with half power. The second coupler 405 synthesizes two signals with a phase difference of 90 ° or 180 ° into one radio frequency signal. Specifically, in the embodiment of the balanced amplifier, the first coupler 402 divides one path of radio frequency signal into two paths of signals with a phase difference of 90 °, and the second coupler 405 synthesizes the two paths of signals with a phase difference of 90 ° into one path of radio frequency signal; in an embodiment of the differential amplifier, the first coupler 402 divides one path of radio frequency signal into two paths of signals with a phase difference of 180 °, and the second coupler 405 synthesizes the two paths of signals with a phase difference of 180 ° into one path of radio frequency signal.
In a preferred embodiment, the first and second isolated terminals are coupled to ground through a resistor, a capacitor, an inductor, or a combination thereof. For example, the first isolated terminal is coupled to ground through a resistor 407, and the resistance value of the resistor 407 is 0 to 100 Ω, such as 50 Ω. For example, the second isolation terminal is coupled to ground through a resistor 408, and the resistance value of the resistor 408 is 0 to 100 Ω, such as 50 Ω.
In a preferred embodiment, a radio frequency signal is coupled to the input switch, the first coupler divides the radio frequency signal into two paths of signals with phase difference and outputs the two paths of signals of the radio frequency signal to the first and second power amplifiers, the first and second power amplifiers amplify the two paths of signals of the radio frequency signal, the second coupler synthesizes the two paths of signals of the radio frequency signal, and the output switch outputs the synthesized radio frequency signal to a radio frequency antenna.
Specifically, a radio frequency input signal RFin a enters a first coupler 402 through an output switch 401, the first coupler 402 divides the input signal RFin a into two paths, which are respectively input to a first power amplifier 403 and a second power amplifier 404, the amplified signals are output and power-combined through a second coupler 405, and then the signals are output to an antenna ANT2 through an output switch 406.
Example two
The balanced or differential amplifier of this embodiment is substantially the same as the balanced or differential amplifier of the first embodiment, except that: the radio frequency signals are coupled to different ports of the first coupler such that the same radio frequency signal is transmitted through different antennas. Specifically, referring to fig. 2, a radio frequency input signal RFin a enters a first coupler 502 through an output switch 501, the first coupler 502 divides the input radio frequency signal into two paths, and the two paths are respectively input to a first power amplifier 503 and a second power amplifier 504, the amplified signals are output and power-combined through a second coupler 505, and then output to a first antenna ANT1 through an output switch 506.
The first embodiment and the second embodiment are both described by taking a balanced amplifier as an example, and it should be understood by those skilled in the art that the first embodiment and the second embodiment are both applicable to a differential amplifier, that is, the coupler phase-shifts the radio frequency signal by 180 °, which can achieve the same technical effect, and will not be described herein again.
EXAMPLE III
The balanced or differential amplifier of this embodiment is substantially the same as the balanced or differential amplifier of the first embodiment, except that: the two radio frequency signals are respectively coupled to the input switch, the first coupler respectively divides the two radio frequency signals into two paths of signals with phase difference and respectively outputs the two paths of signals of the two radio frequency signals to the first power amplifier and the second power amplifier, the first power amplifier and the second power amplifier respectively amplify the two paths of signals of the two radio frequency signals, the second coupler respectively synthesizes the two paths of signals of the two radio frequency signals, and the output switch respectively outputs the synthesized two radio frequency signals to a single radio frequency antenna.
Referring to fig. 3, rf input signals RFin a and RFin B enter a first coupler 602 through an output switch 601, the first coupler 602 divides the input signals into two paths and inputs the two paths to a first power amplifier 603 and a second power amplifier 604, respectively, the amplified signals are output and power-combined through a second coupler 605, and then output to a first antenna ANT1 and a second antenna ANT2 through an output switch 606, respectively. In this embodiment, the balanced or differential amplifier is used in a dual-frequency circuit, and amplifies the input signals RFin a and RFin B at the same time, thereby achieving dual-frequency transmission, and achieving the purpose of reducing the front-end volume of the radio frequency module and saving the cost.
Example four
The present embodiment further provides a method for amplifying a power of a radio frequency signal, where a flowchart of the method for amplifying a power of a radio frequency signal is shown in fig. 4, and the method includes:
step S101, inputting at least one radio frequency signal at least to an input switch, and outputting the at least one radio frequency signal to a first end and a second end of a first coupler through the input switch;
step S103, the first coupler decomposes at least one of the at least one radio frequency signal;
step S105, the first and second power amplifiers are respectively configured to amplify one of the at least one radio frequency signal, and output the amplified at least one radio frequency signal to the first and second ends of the second coupler;
step S107, the second coupler synthesizes the amplified at least one radio frequency signal;
step S109, respectively outputting the synthesized at least one radio frequency signal to at least one radio frequency antenna through an output switch.
In a preferred embodiment, the at least one radio frequency signal is input to the first coupler with half power, the first coupler divides the at least one radio frequency signal into two signals having a phase difference and outputs the two signals of the at least one radio frequency signal to the first and second power amplifiers, the first and second power amplifiers amplify the two signals of the at least one radio frequency signal, the second coupler synthesizes the two signals of the at least one radio frequency signal, and the output switch outputs the synthesized at least one radio frequency signal to the at least one radio frequency antenna.
In a preferred embodiment, one end of the input switch is coupled to a first isolation terminal, and the first isolation terminal is coupled to a ground terminal through a resistor, a capacitor, an inductor, or a combination thereof.
In a preferred embodiment, one end of the output switch is coupled to a second isolation terminal, and the second isolation terminal is coupled to a ground terminal through a resistor, a capacitor, an inductor, or a combination thereof.
EXAMPLE five
The present embodiment further provides a radio frequency circuit, including: as shown in fig. 5, the balanced or differential amplifier may be an amplifier in the first, second, and third embodiments, and includes an input switch 701, a first coupler 702, first and second power amplifiers 703 and 704, a second coupler 705, and an output switch 706, which may implement the radio frequency signal amplification function in the first, second, and third embodiments. The output switch 706 is further connected to a first receiving branch and a second receiving branch, wherein the first receiving branch comprises a first receiving signal amplifier 709, and the second receiving branch comprises a second receiving signal amplifier 710. The output switches 706 are coupled to the at least one radio frequency antenna through filters, respectively. The output switch 706 is coupled to the first antenna ANT1 and the second antenna ANT2 through the first filter 711 and the second filter 712, respectively, to transmit and receive radio frequency signals.
It is noted that, in the present patent application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element. In the present patent application, if it is mentioned that a certain action is executed according to a certain element, it means that the action is executed according to at least the element, and two cases are included: performing the action based only on the element, and performing the action based on the element and other elements. The expression of a plurality of, a plurality of and the like includes 2, 2 and more than 2, more than 2 and more than 2.
All documents mentioned in this specification are to be considered as being incorporated in their entirety into the disclosure of the present application so as to be subject to modification as necessary. It should be understood that the above description is only a preferred embodiment of the present disclosure, and is not intended to limit the scope of the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of the present disclosure should be included in the scope of protection of one or more embodiments of the present disclosure.
In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Claims (10)
1. A balanced or differential amplifier, comprising:
an input switch, wherein at least one radio frequency signal is coupled to the input switch, and one end of the input switch is coupled to a first isolation end;
a first coupler having first and second ends connected to the input switch;
first and second power amplifiers, the first power amplifier coupled to the third terminal of the first coupler, the second power amplifier coupled to the fourth terminal of the first coupler;
a second coupler having first and second terminals coupled to the first and second power amplifiers, respectively;
and the output switches are respectively connected with the second couplers and respectively output the amplified at least one radio frequency signal to at least one radio frequency antenna, wherein one end of each output switch is coupled with a second isolation end.
2. The balanced or differential amplifier according to claim 1, wherein two rf signals are respectively coupled to the input switches, the first coupler respectively divides the two rf signals into two signals having a phase difference and respectively outputs the two signals of the two rf signals to the first and second power amplifiers, the first and second power amplifiers respectively amplify the two signals of the two rf signals, the second coupler respectively combines the two signals of the two rf signals, and the output switches respectively output the combined two rf signals to separate rf antennas.
3. The balanced or differential amplifier as defined in claim 1, wherein a radio frequency signal is coupled to the input switch, the first coupler splits the radio frequency signal into two signals having a phase difference and outputs the two signals of the radio frequency signal to the first and second power amplifiers, respectively, the first and second power amplifiers amplify the two signals of the radio frequency signal, respectively, the second coupler combines the two signals of the radio frequency signal, and the output switch outputs the combined radio frequency signal to a radio frequency antenna.
4. A balanced or differential amplifier as claimed in claim 1, 2 or 3 wherein the first coupler splits a radio frequency signal into two signals with a phase difference of 90 ° or 180 °, and the second coupler combines the two signals with a phase difference of 90 ° or 180 ° into a radio frequency signal.
5. The balanced or differential amplifier of claim 1, wherein the first and the second isolated terminals are coupled to ground through a resistor, a capacitor, an inductor, or a combination thereof.
6. A method of power amplification of a radio frequency signal, comprising:
inputting at least one radio frequency signal into at least an input switch, outputting the at least one radio frequency signal through the input switch to first and second terminals of a first coupler;
the first coupler splits at least one of the at least one radio frequency signal;
the first and second power amplifiers are respectively used for amplifying one of the at least one radio frequency signal and outputting the amplified at least one radio frequency signal to a first end and a second end of a second coupler;
the second coupler synthesizes the amplified at least one radio frequency signal;
and outputting the synthesized at least one radio frequency signal to at least one radio frequency antenna through an output switch respectively.
7. The method for power amplifying a radio frequency signal according to claim 6, wherein the at least one radio frequency signal is inputted to the first coupler with half power, the first coupler splits the at least one radio frequency signal into two signals having a phase difference and outputs the two signals of the at least one radio frequency signal to the first and second power amplifiers, respectively, the first and second power amplifiers amplify the two signals of the at least one radio frequency signal, respectively, the second coupler combines the two signals of the at least one radio frequency signal, respectively, and the output switch outputs the combined at least one radio frequency signal to at least one radio frequency antenna.
8. The method of power amplification of a radio frequency signal of claim 6, wherein one end of the input switch is coupled to a first isolated end, the first isolated end being coupled to ground through a resistor, a capacitor, an inductor, or a combination thereof.
9. The method of power amplification of a radio frequency signal of claim 6, wherein one end of the output switch is coupled to a second isolated end, the second isolated end being coupled to ground through a resistor, a capacitor, an inductor, or a combination thereof.
10. A radio frequency circuit, comprising: a balanced or differential amplifier according to any of claims 1 to 5, the output switch further connecting a first receiving branch and a second receiving branch, the output switches being coupled to the at least one radio frequency antenna via filters respectively.
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| CN202010147267.9A CN111245379A (en) | 2020-03-05 | 2020-03-05 | Balanced or differential amplifier, power amplifying method and radio frequency circuit |
| PCT/CN2020/078632 WO2021174566A1 (en) | 2020-03-05 | 2020-03-10 | Balanced or differential amplifier and power amplification method, radio frequency circuit |
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| CN202010147267.9A CN111245379A (en) | 2020-03-05 | 2020-03-05 | Balanced or differential amplifier, power amplifying method and radio frequency circuit |
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| CN111682885A (en) * | 2020-06-09 | 2020-09-18 | 芯朴科技(上海)有限公司 | 1T2R radio frequency circuit and wireless communication equipment |
| CN111697985A (en) * | 2020-06-12 | 2020-09-22 | 芯朴科技(上海)有限公司 | 5G radio frequency receiving circuit and wireless communication equipment |
| CN112202443A (en) * | 2020-09-25 | 2021-01-08 | 武汉中科医疗科技工业技术研究院有限公司 | Radio frequency switch device and radio frequency switch system |
| CN112311465A (en) * | 2020-10-30 | 2021-02-02 | 南京国博电子有限公司 | Microwave transceiving front-end circuit |
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| CN115276721A (en) * | 2022-02-22 | 2022-11-01 | 上海英内物联网科技股份有限公司 | RFID signal reading system based on signal compensation and amplification |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111682885A (en) * | 2020-06-09 | 2020-09-18 | 芯朴科技(上海)有限公司 | 1T2R radio frequency circuit and wireless communication equipment |
| CN111697985A (en) * | 2020-06-12 | 2020-09-22 | 芯朴科技(上海)有限公司 | 5G radio frequency receiving circuit and wireless communication equipment |
| WO2021248518A1 (en) * | 2020-06-12 | 2021-12-16 | 芯朴科技(上海)有限公司 | 5g radio frequency receiving circuit and wireless communication device |
| CN112202443A (en) * | 2020-09-25 | 2021-01-08 | 武汉中科医疗科技工业技术研究院有限公司 | Radio frequency switch device and radio frequency switch system |
| CN112311465A (en) * | 2020-10-30 | 2021-02-02 | 南京国博电子有限公司 | Microwave transceiving front-end circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021174566A1 (en) | 2021-09-10 |
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