CN119135205A - Transmitter, receiver, radio frequency transceiver system and interference signal suppression method - Google Patents
Transmitter, receiver, radio frequency transceiver system and interference signal suppression method Download PDFInfo
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- CN119135205A CN119135205A CN202411120570.4A CN202411120570A CN119135205A CN 119135205 A CN119135205 A CN 119135205A CN 202411120570 A CN202411120570 A CN 202411120570A CN 119135205 A CN119135205 A CN 119135205A
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- 230000010363 phase shift Effects 0.000 claims description 14
- 230000003321 amplification Effects 0.000 claims description 13
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 13
- 230000002194 synthesizing effect Effects 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 description 157
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- 238000010168 coupling process Methods 0.000 description 7
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
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Abstract
The invention provides a radio frequency receiving and transmitting system and an interference signal suppression method thereof, wherein a transmitter system comprises a first power divider, a first bridge, a first frequency shifting amplifying module and a first coupler, wherein the local oscillator signal is divided into a first local oscillator signal and a second local oscillator signal, the intermediate frequency input signal is divided into an intermediate frequency I+ signal and an intermediate frequency Q+ signal by the first bridge, the first local oscillator signal is divided into a local oscillator I+ signal and a local oscillator Q-signal by the first filter, the first frequency mixer mixes the intermediate frequency I+ signal and the local oscillator I+ signal to obtain a first mixed signal, the second frequency mixer mixes the intermediate frequency Q+ signal and the local oscillator Q-signal to obtain a second mixed signal, the second power divider synthesizes the first mixed signal and the second mixed signal to obtain a first signal to be coupled, the first frequency shifting amplifying module shifts and amplifies the second local oscillator signal to obtain a second signal to be coupled, and the first coupler couples the first signal and the second signal to be coupled to obtain a radio frequency signal. According to the technical scheme of the embodiment, the design complexity can be reduced, and the performance of the radio frequency receiving and transmitting system is improved.
Description
Technical Field
The present invention relates to the field of radio frequency transceiver technologies, and in particular, to a transmitter, a receiver, a radio frequency transceiver system, and an interference signal suppression method.
Background
In the prior art, the frequency of a local oscillator signal converted by the emitter and the frequency of a receiver of the phased radar are very close to the frequency of a radio frequency signal, the difficulty of a filter in restraining the local oscillator signal and the image signal is high, the size is large, the bandwidth of a receiving and transmitting front-end system is small, the local oscillator signal directly falls in a radio frequency working frequency band when the broadband is applied, the situation that the filter cannot be used is caused, and the performance of the radio frequency receiving and transmitting system is poor.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a transmitter, a receiver, a radio frequency receiving and transmitting system and an interference signal suppression method, which can improve the performance of the radio frequency receiving and transmitting system without installing an additional filter bank.
In a first aspect, an embodiment of the present invention provides a transmitter system, including:
the first power divider is used for dividing the local oscillation signal into a first local oscillation signal and a second local oscillation signal;
a first bridge for dividing the intermediate frequency input signal into an intermediate frequency i+ signal and an intermediate frequency q+ signal;
The first filter is used for dividing the first local oscillation signal into a local oscillation I+ signal and a local oscillation Q-signal;
The first mixer is used for mixing the intermediate frequency I+ signal and the local oscillator I+ signal to obtain a first mixed signal;
the second mixer is used for mixing the intermediate frequency Q+ signal and the local oscillator Q-signal to obtain a second mixed signal;
the second power divider is used for synthesizing the first mixed signal and the second mixed signal to obtain a first signal to be coupled;
The first phase shifting amplifying module is used for carrying out phase shifting and amplifying on the second local oscillation signal to obtain a second signal to be coupled;
And the first coupler is used for coupling the first signal to be coupled and the second signal to be coupled and outputting a radio frequency signal.
In some embodiments of the invention, the first phase shift amplifying module includes:
the first phase shifter is used for shifting the phase of the second local oscillation signal;
And the first amplifier is used for carrying out gain amplification on the second local oscillation signal after phase shifting.
In a second aspect, an embodiment of the present invention provides a receiver system, including:
the third power divider is used for dividing the local oscillation signal into a first local oscillation signal and a second local oscillation signal;
the second bridge is used for dividing the radio frequency input signal into a radio frequency I+ signal and a radio frequency Q+ signal;
the second filter is used for dividing the first local oscillation signal into a local oscillation I+ signal and a local oscillation Q+ signal;
The third mixer is used for mixing the radio frequency I+ signal and the local oscillator I+ signal to obtain a third mixed signal;
The fourth mixer is used for mixing the radio frequency Q+ signal and the local oscillator Q+ signal to obtain a fourth mixed signal;
The fourth power divider is used for synthesizing the third mixed signal and the fourth mixed signal to obtain a third signal to be coupled;
The second phase shifting amplifying module is used for carrying out phase shifting and amplifying on the second local oscillation signal to obtain a fourth signal to be coupled;
And the second coupler is used for coupling the third signal to be coupled and the fourth signal to be coupled and outputting an intermediate frequency signal.
In some embodiments of the invention, the second phase shift amplifying module includes:
the second phase shifter is used for shifting the phase of the second local oscillation signal;
and the second amplifier is used for carrying out gain amplification on the second local oscillation signal after phase shifting.
In a third aspect, an embodiment of the present invention provides a radio frequency transceiver system, including a transmitter system and a receiver system according to the first and second aspects, where the transmitter system is communicatively connected to the receiver system.
In a fourth aspect, an embodiment of the present invention provides an interference signal suppression method, which is applied to the transmitter system in the first aspect, and is characterized in that the method includes:
Obtaining a local oscillation signal, and dividing the local oscillation signal into a first local oscillation signal and a second local oscillation signal;
obtaining an intermediate frequency input signal, and dividing the intermediate frequency input signal into an intermediate frequency I+ signal and an intermediate frequency Q+ signal;
Dividing the first local oscillation signal into a local oscillation I+ signal and a local oscillation Q-signal;
mixing the intermediate frequency I+ signal and the local oscillator I+ signal to obtain a first mixed signal;
Mixing the intermediate frequency Q+ signal and the local oscillator Q-signal to obtain a second mixed signal;
Synthesizing the first mixed signal and the second mixed signal to obtain a first signal to be coupled;
performing phase shifting and amplification on the second local oscillation signal to obtain a second signal to be coupled;
and coupling the first signal to be coupled with the second signal to be coupled, and outputting a radio frequency signal.
In some embodiments of the present invention, the phase shifting and amplifying the second local oscillation signal to obtain a second signal to be coupled includes:
the first phase shifter shifts the phase of the second local oscillation signal;
And the first amplifier amplifies the phase-shifted second local oscillation signal to obtain a second signal to be coupled.
In a fifth aspect, an embodiment of the present invention provides an interference signal suppression method, which is applied to the receiver system in the second aspect, and is characterized in that the method includes:
dividing the local oscillation signal into a first local oscillation signal and a second local oscillation signal;
dividing a radio frequency input signal into a radio frequency I+ signal and a radio frequency Q+ signal;
Dividing the first local oscillation signal into a local oscillation I+ signal and a local oscillation Q+ signal;
Mixing the radio frequency I+ signal and the local oscillator I+ signal to obtain a third mixed signal;
mixing the radio frequency Q+ signal and the local oscillator Q+ signal to obtain a fourth mixed signal;
Synthesizing the third mixed signal and the fourth mixed signal to obtain a third signal to be coupled;
Performing phase shifting and amplification on the second local oscillation signal to obtain a fourth signal to be coupled;
And coupling the third signal to be coupled with the fourth signal to be coupled, and outputting an intermediate frequency signal.
In some embodiments of the present invention, the phase shifting and amplifying the second local oscillation signal to obtain a fourth signal to be coupled includes:
A second phase shifter shifts the phase of the second local oscillation signal;
and the second amplifier amplifies the phase-shifted second local oscillation signal to obtain a fourth signal to be coupled.
In a sixth aspect, an embodiment of the present invention provides an interference signal suppression method applied to the radio frequency transceiver system of the third aspect
A system, comprising:
Performing, by the transmitter system, the interfering signal rejection method according to the fourth aspect;
The interference signal suppression method according to the fifth aspect is performed by the receiver system.
The transmitter system according to the embodiment of the invention has at least the following beneficial effects:
According to the technical scheme of the embodiment, IQ mixing image suppression and local oscillator leakage suppression are carried out at the front end of radio frequency transceiving so as to enable a transmitter radio frequency band filter bank, a radio frequency band filter bank in a receiver and a local oscillator leakage suppressor of an intermediate frequency band to meet broadband application without using a filter, design complexity is reduced, and performance of a radio frequency transceiving system is improved.
Drawings
Fig. 1is a schematic diagram of the overall structure of a transmitter system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the overall structure of a receiver system according to an embodiment of the present invention;
fig. 3 is a flow chart of interference signal suppression by a transmitter system according to an embodiment of the present invention;
Fig. 4 is a flowchart of performing phase shifting and amplifying on a second local oscillation signal to obtain a second signal to be coupled according to an embodiment of the present invention;
fig. 5 is a flow chart of interference signal suppression by a receiver system according to an embodiment of the present invention;
Fig. 6 is a flowchart of performing phase shifting and amplifying on a second local oscillation signal to obtain a fourth signal to be coupled according to an embodiment of the present invention.
Reference numerals:
The first power divider 1, the first bridge 2, the first filter 3, the first mixer 4, the second mixer 5, the second power divider 6, the first phase shift amplifying module 7, the first phase shifter 71, the first amplifier 72, the first coupler 8, the third power divider 10, the second bridge 20, the second filter 30, the third mixer 40, the fourth mixer 50, the fourth power divider 60, the second phase shift amplifying module 70, the second coupler 80, the second phase shifter 701, the second amplifier 702, the local oscillator signal LO, the first local oscillator signal LO1, the second local oscillator signal L02, the intermediate frequency signal I F, and the radio frequency signal RF.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
In a first aspect, referring to fig. 1, an embodiment of the present invention provides a transmitter system, which includes a first power divider 1 configured to divide a local oscillator signal L0 into a first local oscillator signal L01 and a second local oscillator signal L02, a first bridge 2 configured to divide an intermediate frequency input signal into an intermediate frequency i+ signal and an intermediate frequency q+ signal, a first filter 3 configured to divide the first local oscillator signal L01 into a local oscillator i+ signal and a local oscillator Q-signal, a first mixer 4 configured to mix the intermediate frequency i+ signal and the local oscillator i+ signal to obtain a first mixed signal, a second mixer 5 configured to mix the intermediate frequency q+ signal and the local oscillator Q-signal to obtain a second mixed signal, a second power divider 6 configured to synthesize the first mixed signal and the second mixed signal to obtain a first signal to be coupled, a first phase-shift amplifying module 7 configured to perform amplification on the second local oscillator signal L02 to obtain a second signal to be coupled, and a first coupler 8 configured to couple the first signal to be coupled to the second signal to be coupled, and an output RF signal of the first coupler 8.
It should be noted that, for the transmitter system, the intermediate frequency input signal is divided into an intermediate frequency i+ and an intermediate frequency q+ signal by the first bridge 2, the input local oscillation signal L0 is divided into a first local oscillation signal L01 and a second local oscillation signal L02 by the first power divider 1, the first local oscillation signal L01 is divided into a local oscillation i+ signal and a local oscillation Q-signal by the first filter 3, the intermediate frequency i+ signal and the local oscillation i+ signal are mixed by the first mixer 4 to obtain a first mixed signal, and the intermediate frequency q+ signal and the local oscillation Q-signal are mixed by the second mixer 5 to obtain a second mixed signal. The first mixing signal and the second mixing signal are jointly fed into a second power divider 6 to be synthesized to obtain a first signal to be coupled, the first signal to be coupled is input to a first input end of a first coupler 8, the second local oscillation signal L02 is subjected to phase shifting and amplification by a first phase shifting amplification module 7 to obtain a second signal to be coupled, the second signal to be coupled is input to a second input end of the first coupler 8, the first coupler 8 couples the first signal to be coupled and the second signal to be coupled, and a radio frequency signal RF is output. Specifically, the first mixer 4 and the second mixer 5 can multiply two signals with different frequencies to obtain new signals of sum and difference of the two different frequencies.
Further, the transmitter system realizes image rejection through the first mixer 4 and the second mixer 5, and realizes local oscillation signal L0 rejection through inputting the second local oscillation signal L02 into the first coupler 8 for cancellation. By changing the frequency of the local oscillation signal L0, the transmitter system can realize the RF output of the broadband radio frequency signal without adding a filter bank on the RF output side of the radio frequency signal. In addition, for the transmitter system, the wideband radio frequency signal RF output can be realized by adjusting the frequency range of the local oscillation signal L0, so that the worry that the radio frequency signal RF is in the frequency band of the local oscillation signal L0 is not needed, and the wideband circuit application is satisfied.
As will be appreciated by those skilled in the art, for image rejection, the transmitter system is implemented using a quadrature mixer architecture, where the intermediate frequency i+ signal output by the first bridge 2 and the local oscillator i+ signal output by the first filter 3 are mixed by the first mixer 4, and the intermediate frequency q+ signal output by the first bridge 2 and the local oscillator Q-signal output by the first filter 3 are mixed by the second mixer 5, so that the first mixer 4 and the second mixer 5 perform computation of quadrature and conjugate components on the intermediate frequency signal I F and the local oscillator signal L0, respectively, thereby effectively suppressing the mixed image rejection of the transmitter system. In addition, the new signals of the frequency sum and the frequency difference are obtained by the new signals of the I and the Q under the action of the first power divider 1, and the cancellation of the signals of the frequency difference realizes image rejection.
The first phase-shifting amplifying module 7 includes a first phase shifter 71 for shifting the phase of the second local oscillation signal L02, and a first amplifier 72 for gain-amplifying the phase-shifted second local oscillation signal L02.
In the process of suppressing the local oscillation signal L0, the local oscillation signal L0 enters the second input end of the first coupler 8 through the first phase shifter 71 and the first amplifier 72, and the phase of the local oscillation signal L0 is adjusted through the first phase shifter 71, so that the local oscillation signal L0 and the image frequency have a phase difference after being processed by the first phase shifter 71, so that the local oscillation signal L0 and the image frequency are primarily reduced, and when the local oscillation signal L0 is amplified by the first amplifier 72, the amplitude of the local oscillation signal L0 is increased, so that the interference effect is generated between the local oscillation signal L0 and the image frequency after the local oscillation signal L0 is received by the first coupler 8, thereby achieving the suppression of the local oscillation signal L0. The local oscillation signal suppression is realized by adjusting the first phase shifter 71 and the first amplifier 72 to realize the cancellation of the same amplitude and opposite phase of the local oscillation signal L0 leaked from the side of the first power divider 1 when the signals enter the coupler.
Alternatively, the first amplifier 72 is a variable gain amplifier and the first filter 3 is a passive polyphase filter.
In a second aspect, referring to fig. 2, an embodiment of the present invention provides a receiver system, which includes a third power divider 10 for dividing a local oscillation signal L0 into a first local oscillation signal L01 and a second local oscillation signal L02, a second bridge 20 for dividing a radio frequency input signal RF into a radio frequency i+ signal and a radio frequency q+ signal, a second filter 30 for dividing the first local oscillation signal L01 into a local oscillation i+ signal and a local oscillation q+ signal, a third mixer 40 for mixing the radio frequency i+ signal and the local oscillation i+ signal to obtain a third mixed signal, a fourth mixer 50 for mixing the radio frequency q+ signal and the local oscillation q+ signal to obtain a fourth mixed signal, a fourth power divider 60 for synthesizing the third mixed signal and the fourth mixed signal to obtain a third signal to be coupled, a second phase shift amplifying module 70 for phase shifting and amplifying the second local oscillation signal L02 to obtain a fourth signal to be coupled, and a second coupler 80 for coupling the third signal to be coupled to the fourth signal to be coupled to the intermediate frequency I F.
It should be noted that, for the receiver system, the radio frequency input signal RF is divided into a radio frequency i+ signal and a radio frequency q+ signal by the second bridge 20, the local oscillation signal L0 is divided into a first local oscillation signal L01 and a second local oscillation signal L02 by the third power divider 10, the first local oscillation signal L01 is divided into a local oscillation i+ signal and a local oscillation q+ signal by the second filter 30, the radio frequency i+ signal and the local oscillation i+ signal are mixed by the third mixer 40 to obtain a third mixed signal, the radio frequency q+ signal and the local oscillation q+ signal are mixed by the fourth mixer 50 to obtain a fourth mixed signal, the third mixed signal and the third mixed signal are input to the fourth power divider 60 to be synthesized to obtain a third to-be-coupled signal, the third to-be-coupled signal is input to the first input end of the second coupler 80, the second to-be-coupled signal L02 is phase-shifted and amplified by the second phase-shift amplification module 70 to obtain a fourth to-be-coupled signal, the fourth to-be-coupled signal is input to the second input end of the second coupler 80, the third to be-coupled signal is output to the fourth coupler I F. In addition, for the receiver system, the wideband intermediate frequency signal I F can be output by adjusting the frequency range of the local oscillation signal L0, so that the local oscillation signal L0 is not worried about being in the frequency band of the intermediate frequency signal I F, and the wideband circuit application can be satisfied.
The second phase-shifting amplifying module 70 includes a second phase shifter 701 for shifting the phase of the second local oscillation signal L02, and a second amplifier 702 for gain-amplifying the phase-shifted second local oscillation signal L02.
Optionally, the second amplifier 702 is a variable gain amplifier and the second filter 30 is a passive polyphase filter.
In the process of suppressing the local oscillation signal L0, the local oscillation signal L0 enters the second input end of the coupler through the second phase shifter 701 and the second amplifier 702, and the phase of the local oscillation signal L0 is adjusted through the second phase shifter 701, so that the phase difference exists between the local oscillation signal L0 and the mirror frequency after being processed by the second phase shifter 701, and the local oscillation signal L0 and the mirror frequency are primarily reduced, and when the local oscillation signal L0 is amplified by the second amplifier 702, the amplitude of the local oscillation signal L0 is increased, so that the interference effect is generated between the second coupler 80 and the mirror frequency after receiving the local oscillation signal L0, thereby achieving the suppression of the local oscillation signal L0.
In a third aspect, the present embodiment provides a radio frequency transceiver system, including the transmitter system of the first aspect and the receiver system of the second aspect, where the transmitter system is communicatively connected to the receiver system.
In the radio frequency transceiver system, the first filter 3 of the transmitter system and the second filter 30 of the receiver system can realize i+, I-, q+, Q-four paths of output signals, when the radio frequency transceiver system needs to transmit radio frequency signals RF, the transmitter system receives local oscillation signals L0 and intermediate frequency signals I F, uses i+ and Q-signals, and the I-and q+ signals are matched in load connection, and finally outputs radio frequency signals RF through the first coupler 8, and the receiver system receives radio frequency signals RF and local oscillation signals L0 output by the transmitter system, and matches loads between practical i+ and q+ and I-and Q-signals, thereby realizing that the radio frequency transceiver system does not use filter filters to meet broadband application, and reducing design complexity and cost problems of the radio frequency transceiver system.
In a fourth aspect, referring to fig. 3, fig. 3 is a flowchart of an interference signal suppression method according to an embodiment of the present invention, where the interference signal suppression method includes, but is not limited to, the following steps:
Step S11, obtaining a local oscillation signal L0, and dividing the local oscillation signal L0 into a first local oscillation signal L01 and a second local oscillation signal L02;
Step S12, obtaining an intermediate frequency input signal, and dividing the intermediate frequency input signal into an intermediate frequency I+ signal and an intermediate frequency Q+ signal;
S13, dividing a first local oscillation signal L01 into a local oscillation I+ signal and a local oscillation Q-signal;
Step S14, mixing the intermediate frequency I+ signal and the local oscillator I+ signal to obtain a first mixed signal;
step S15, mixing the intermediate frequency Q+ signal and the local oscillator Q-signal to obtain a second mixed signal;
Step S16, synthesizing the first mixed signal and the second mixed signal to obtain a first signal to be coupled;
step S17, phase shifting and amplifying the second local oscillation signal L02 to obtain a second signal to be coupled;
step S18, coupling the first signal to be coupled and the second signal to be coupled, and outputting a radio frequency signal RF.
It should be noted that, the intermediate frequency input signal is divided into an intermediate frequency i+ and an intermediate frequency q+ signal by the first bridge 2, the input local oscillation signal L0 is divided into a first local oscillation signal L01 and a second local oscillation signal L02 by the first power divider 1, the first local oscillation signal L01 is divided into a local oscillation i+ signal and a local oscillation Q-signal by the first filter 3, the intermediate frequency i+ signal and the local oscillation i+ signal are mixed by the first mixer 4 to obtain a first mixed signal, and the intermediate frequency q+ signal and the local oscillation Q-signal are mixed by the second mixer 5 to obtain a second mixed signal. The first mixing signal and the second mixing signal are jointly fed into a second power divider 6 to be synthesized to obtain a first signal to be coupled, the first signal to be coupled is input to a first input end of a first coupler 8, the second local oscillation signal L02 is subjected to phase shifting and amplification by a first phase shifting amplification module 7 to obtain a second signal to be coupled, the second signal to be coupled is input to a second input end of the first coupler 8, the first coupler 8 couples the first signal to be coupled and the second signal to be coupled, and a radio frequency signal RF is output.
In addition, in an embodiment, referring to fig. 4, in step S17 of the embodiment shown in fig. 3, the following steps are further included, but not limited to:
step S21, the first phase shifter 71 shifts the phase of the second local oscillation signal L02;
in step S22, the first amplifier 72 amplifies the phase-shifted second local oscillation signal L02 to obtain a second signal to be coupled.
In the process of suppressing the local oscillation signal L0, the local oscillation signal L0 enters the second input end of the coupler through the first phase shifter 71 and the first amplifier 72, and the phase of the local oscillation signal L0 is adjusted through the first phase shifter 71, so that the phase difference exists between the local oscillation signal L0 and the mirror frequency after being processed by the first phase shifter 71, and the local oscillation signal L0 and the mirror frequency are primarily reduced, and when the local oscillation signal L0 is amplified by the first amplifier 72, the amplitude of the local oscillation signal L0 is increased, so that the interference effect is generated between the first coupler 8 and the mirror frequency after receiving the local oscillation signal, thereby achieving the suppression of the local oscillation signal L0.
In a fifth aspect, referring to fig. 5, fig. 5 is a flowchart of an interference signal suppression method according to an embodiment of the present invention, where the interference signal suppression method includes, but is not limited to, the following steps:
Step S31, dividing the local oscillation signal L0 into a first local oscillation signal L01 and a second local oscillation signal L02;
step S32, dividing the radio frequency input signal RF into a radio frequency I+ signal and a radio frequency Q+ signal;
step S33, dividing the first local oscillation signal L01 into a local oscillation I+ signal and a local oscillation Q+ signal;
step S34, mixing the radio frequency I+ signal and the local oscillator I+ signal to obtain a third mixed signal;
step S35, mixing the radio frequency Q+ signal and the local oscillator Q+ signal to obtain a fourth mixed signal;
step S36, synthesizing the third mixed signal and the fourth mixed signal to obtain a third signal to be coupled;
step S37, phase shifting and amplifying the second local oscillation signal L02 to obtain a fourth signal to be coupled;
Step S38, coupling the third to-be-coupled signal and the fourth to-be-coupled signal, and outputting an intermediate frequency signal I F.
It should be noted that, for the receiver system, the radio frequency input signal RF is divided into a radio frequency i+ signal and a radio frequency q+ signal by the second bridge 20, the local oscillation signal L0 is divided into a first local oscillation signal L01 and a second local oscillation signal L02 by the third power divider 10, the first local oscillation signal L01 is divided into a local oscillation i+ signal and a local oscillation q+ signal by the second filter 30, the radio frequency i+ signal and the local oscillation i+ signal are mixed by the third mixer 40 to obtain a third mixed signal, the radio frequency q+ signal and the local oscillation q+ signal are mixed by the fourth mixer 50 to obtain a fourth mixed signal, the third mixed signal and the third mixed signal are input to the fourth power divider 60 to be synthesized to obtain a third to-be-coupled signal, the third to-be-coupled signal is input to the first input end of the second coupler 80, the second to-be-coupled signal L02 is phase-shifted and amplified by the second phase-shift amplification module 70 to obtain a fourth to-be-coupled signal, the fourth to-be-coupled signal is input to the second input end of the second coupler 80, the third to be-coupled signal is output to the fourth coupler I F.
In addition, in an embodiment, referring to fig. 6, in step S37 of the embodiment shown in fig. 5, the following steps are included, but not limited to:
Step S41, the second phase shifter 701 shifts the phase of the second local oscillation signal L02;
In step S42, the second amplifier 702 amplifies the phase-shifted second local oscillation signal L02 to obtain a fourth signal to be coupled.
In the process of suppressing the local oscillation signal L0, the local oscillation signal L0 enters the second input end of the coupler through the second phase shifter 701 and the second amplifier 702, and the phase of the local oscillation signal is adjusted through the second phase shifter 701, so that a phase difference exists between the local oscillation signal L0 and the mirror frequency after being processed by the second phase shifter 701, and the local oscillation signal L0 and the mirror frequency are primarily reduced, and when the local oscillation signal L0 is amplified by the second amplifier 702, the amplitude of the local oscillation signal L0 is increased, so that the interference effect is generated between the second coupler 80 and the mirror frequency after receiving the local oscillation signal L0, thereby achieving the suppression of the local oscillation signal L0.
In a sixth aspect, an embodiment of the present invention further provides an interference signal suppression method, which is applied to the radio frequency transceiver system of the third aspect, and specifically includes performing, by a transmitter system, the interference signal suppression method according to the fourth aspect, and performing, by a receiver system, the interference signal suppression method according to the fifth aspect.
In the radio frequency transceiver system, the first filter 3 of the transmitter system and the second filter 30 of the receiver system can realize four paths of i+, I-, q+, and Q-output signals, when the radio frequency transceiver system needs to transmit the radio frequency signal RF, the transmitter system receives the local oscillation signal L0 and the intermediate frequency signal I F, uses the i+ and Q-signals, and the I-and q+ signals are matched with each other, and finally outputs the radio frequency signal RF through the first coupler 8, and the receiver system receives the radio frequency signal RF and the local oscillation signal L0 output by the transmitter system, uses the i+ and q+ and the I-and Q-signals to match the loads, thereby realizing that the radio frequency transceiver system does not use the filter to meet broadband application, and reducing design complexity and cost problems of the radio frequency transceiver system.
While the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit and scope of the present invention, and these equivalent modifications or substitutions are included in the scope of the present invention as defined in the appended claims.
Claims (10)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119519606A (en) * | 2025-01-17 | 2025-02-25 | 电子科技大学 | A monolithic integrated frequency conversion circuit with image suppression switching and a superheterodyne system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119519606A (en) * | 2025-01-17 | 2025-02-25 | 电子科技大学 | A monolithic integrated frequency conversion circuit with image suppression switching and a superheterodyne system |
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