CN113472299A

CN113472299A - Signal receiving and transmitting front-end circuit

Info

Publication number: CN113472299A
Application number: CN202010235334.2A
Authority: CN
Inventors: 廖平昌; 李竞波; 王保卫; 贺明萧
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2021-10-01
Anticipated expiration: 2040-03-30
Also published as: CN113472299B

Abstract

The invention discloses a signal transceiving front-end circuit, relates to the technical field of electronics, and aims to improve the linearity of the signal transceiving front-end circuit. The signal transceiving front-end circuit provided by the embodiment of the invention comprises: the device comprises a first coupler, a radio frequency power amplifier, a distortion signal extraction module and a modulation coupling module; the first coupler is used for coupling the initial transmitting signal into a first initial transmitting signal and a second initial transmitting signal; the radio frequency power amplifier is used for amplifying the first initial transmitting signal to obtain an amplified transmitting signal; and the distortion signal extraction module is used for extracting a modulation distortion signal according to the amplified transmission signal and the second initial transmission signal, coupling the second amplified transmission signal with the modulation distortion signal to obtain a main transmission signal, and transmitting the main transmission signal. The signal transceiving front-end circuit provided by the embodiment of the invention can offset the main distortion in the amplified transmission signal to obtain the main transmission signal which is amplified and has higher linearity, so that the linearity of the signal transceiving front-end circuit is improved.

Description

Signal receiving and transmitting front-end circuit

Technical Field

The present invention relates to the field of electronic technologies, and in particular, to a signal transceiver front-end circuit.

Background

In the current wireless communication system, the transmission and reception of signals are performed by a signal transceiving front-end circuit in the wireless communication device, wherein a radio frequency power amplifier is a main component in the signal transceiving front-end circuit, and the performance of the whole communication system is affected by indexes of the radio frequency power amplifier, such as efficiency, bandwidth, output power, linearity and the like. With the development of communication technology, the information transmission rate is continuously increased, and higher requirements are put on the power and the efficiency of the radio frequency power amplifier.

From the beginning of the third generation wireless communication system, the mainstream communication system in the industry is the TDD (Time Division Duplex) system, and the wireless transceiving front-end circuit of the TDD communication device can flexibly configure the transceiving ratio and flexibly support the asymmetric service. When a signal needs to be transmitted, the transmitted signal is amplified by a radio frequency power amplifier in a transmitting link, then is output to a filter for filtering processing, and then is transmitted through an antenna. The transmitted signal amplified by the radio frequency power amplifier is seriously distorted, that is, when the signal transceiving front-end circuit of the existing TDD communication device transmits a signal, the radio frequency power amplifier causes serious distortion of the transmitted signal, and the linearity of the signal transceiving front-end circuit is poor.

Disclosure of Invention

The invention provides a signal transceiving front-end circuit, which is used for improving the linearity of the signal transceiving front-end circuit.

In view of the foregoing problems, in a first aspect, an embodiment of the present invention provides a signal transceiving front-end circuit, including:

the device comprises a first coupler, a radio frequency power amplifier, a distortion signal extraction module and a modulation coupling module; wherein the content of the first and second substances,

the first coupler is used for coupling an initial transmitting signal to be transmitted into a first initial transmitting signal and a second initial transmitting signal, outputting the first initial transmitting signal to the radio frequency power amplifier, and outputting the second initial transmitting signal to the distorted signal extraction module;

the radio frequency power amplifier is used for amplifying the first initial transmitting signal to obtain an amplified transmitting signal containing an amplified main transmitting signal and a main distortion signal, and outputting the amplified transmitting signal to the distortion signal extraction module;

the distortion signal extraction module is used for coupling the amplified transmission signal into a first amplified transmission signal and a second amplified transmission signal; after the first amplified transmission signal and/or the second initial transmission signal are subjected to signal modulation processing, the first amplified transmission signal and the second initial transmission signal are coupled to obtain a modulation distortion signal, and the modulation distortion signal is output to the modulation coupling module; and outputting the second amplified transmission signal to the modulation coupling module;

the modulation coupling module is configured to adjust an amplitude of the modulation distortion signal according to a main distortion signal in the second amplified transmission signal, perform phase adjustment on the second amplified transmission signal and/or the modulation distortion signal, couple the second amplified transmission signal with the modulation distortion signal to obtain a main transmission signal in the second amplified transmission signal, and transmit the main transmission signal.

Optionally, the distorted signal extracting module includes: the second coupler, the first delayer and the third coupler; wherein the content of the first and second substances,

the second coupler is configured to couple the amplified transmission signal into a first amplified transmission signal and a second amplified transmission signal, output the first amplified transmission signal to the third coupler, and output the second amplified transmission signal to the modulation coupling module;

the first delayer is configured to receive a second initial transmission signal output by the first coupler, and output the second initial transmission signal to the third coupler after adjusting a phase of the second initial transmission signal; wherein the phase of the second initial transmit signal after the phase adjustment is opposite to the phase of the first amplified transmit signal;

the third coupler is configured to couple the first amplified transmission signal and the second initial transmission signal to obtain a modulation distortion signal after adjusting the amplitudes of the first amplified transmission signal and the second initial transmission signal to be the same, and output the modulation distortion signal to the modulation coupling module.

Optionally, the distorted signal extracting module includes: a second coupler, a second delayer and a third coupler; wherein the content of the first and second substances,

the second coupler is configured to couple the amplified transmission signal into a first amplified transmission signal and a second amplified transmission signal, output the first amplified transmission signal to the second delay, and output the second amplified transmission signal to the modulation coupling module;

the second delayer is used for adjusting the phase of the first amplified transmission signal and outputting the adjusted phase to the third coupler; wherein the phase of the first amplified transmission signal after the phase adjustment is opposite to the phase of the second initial transmission signal;

the third coupler is configured to receive a second initial transmission signal output by the first coupler, adjust the amplitudes of the first amplified transmission signal and the second initial transmission signal to the same amplitude, couple the first amplified transmission signal and the second initial transmission signal to obtain a modulation distortion signal, and output the modulation distortion signal to the modulation coupling module.

Optionally, the distorted signal extracting module includes: the second coupler, the first delayer, the second delayer and the third coupler; wherein the content of the first and second substances,

the first delayer is configured to receive a second initial transmission signal output by the first coupler, and output the second initial transmission signal to the third coupler after adjusting a phase of the second initial transmission signal;

the second delayer is used for adjusting the phase of the first amplified transmission signal and outputting the adjusted phase to the third coupler; wherein the phase of the first amplified transmission signal after the phase adjustment is opposite to the phase of the second initial transmission signal after the phase adjustment;

Optionally, the modulation coupling module includes: a first low noise amplifier, a third delay, a fourth coupler, wherein,

the first low-noise amplifier is configured to receive the modulation distortion signal output by the distortion signal extraction module, adjust the amplitude of the modulation distortion signal to be the same as the amplitude of the main distortion signal, and output the modulation distortion signal after amplitude adjustment to the fourth coupler;

the third delayer is configured to receive the second amplified transmission signal output by the distorted signal extraction module, adjust a phase of the second amplified transmission signal, and output the adjusted phase to the fourth coupler; wherein the phase of the phase-adjusted second amplified transmission signal is opposite to the phase of the modulation distortion signal;

and the fourth coupler is used for coupling the second amplified transmission signal with the modulation distortion signal to obtain a main transmission signal in the second amplified transmission signal and transmitting the main transmission signal.

Optionally, the modulation coupling module includes: a first low noise amplifier, a fourth delay, a fourth coupler, wherein,

the first low-noise amplifier is configured to receive the modulation distortion signal output by the distortion signal extraction module, adjust the amplitude of the modulation distortion signal to be the same as the amplitude of the main distortion signal, and output the modulation distortion signal after amplitude adjustment to the fourth delay;

the fourth delayer is configured to adjust a phase of the modulation distortion signal and output the adjusted phase to the fourth coupler; wherein the phase of the modulated distortion signal after phase adjustment is opposite to the phase of the second amplified transmission signal;

and the fourth coupler is used for receiving the second amplified transmission signal output by the distorted signal extraction module, coupling the second amplified transmission signal with the modulated distorted signal to obtain a main transmission signal in the second amplified transmission signal, and transmitting the main transmission signal.

Optionally, the modulation coupling module includes: a first low noise amplifier, a third delayer, a fourth coupler, wherein,

the third delayer is configured to receive the second amplified transmission signal output by the distorted signal extraction module, adjust a phase of the second amplified transmission signal, and output the adjusted phase to the fourth coupler; the fourth delayer is configured to adjust a phase of the modulation distortion signal and output the adjusted phase to the fourth coupler; wherein the phase of the phase-adjusted modulation distortion signal is opposite to the phase of the phase-adjusted second amplified transmission signal;

Optionally, the signal transceiving front-end circuit further includes a single-pole double-throw circuit switch; the first movable end of the single-pole double-throw circuit change-over switch is connected with the output end of a second coupler in the distortion signal extraction module, the second movable end of the single-pole double-throw circuit change-over switch is connected with the input end of the first low-noise amplifier, and the immobile end of the single-pole double-throw circuit change-over switch is connected with the modulation coupling module;

the single-pole double-throw circuit change-over switch is used for connecting the fixed end with the first movable end when the TDD is in a transmission time slot, and outputting the second amplified transmission signal output by the radio frequency power amplifier to the modulation coupling module; when the TDD is in a receiving time slot, the fixed end is connected with the second movable end, and a received receiving signal is output to the first low-noise amplifier;

the first low noise amplifier is further configured to amplify the received signal.

Optionally, the signal transceiving front-end circuit further includes:

the control module is used for adjusting the working state of the first low-noise amplifier to a first working state when the TDD is in a time slot for sending and adjusting the working state of the first low-noise amplifier to a second working state when the TDD is in a time slot for receiving;

the first low-noise amplifier is configured to adjust the amplitude of the modulation distortion signal to be the same as the amplitude of the main distortion signal in the first operating state, and adjust the amplitude of the received signal to be a first preset value in the second operating state.

In a second aspect, an embodiment of the present invention provides a signal transceiving front-end circuit, including: the radio frequency power amplifier, the single-pole double-throw circuit change-over switch and the modulation coupling module; wherein the content of the first and second substances,

the radio frequency power amplifier is used for amplifying an initial transmitting signal to be transmitted to obtain an amplified transmitting signal containing an amplified main transmitting signal and a main distortion signal, and outputting the amplified transmitting signal to a first moving end of the single-pole double-throw circuit change-over switch;

the single-pole double-throw circuit change-over switch is used for coupling the amplified transmission signal into a first amplified transmission signal and a second amplified transmission signal, outputting the first amplified transmission signal to the modulation coupling module through a stationary end of the single-pole double-throw circuit change-over switch, which is connected with the first movable end, and outputting the second amplified transmission signal to the modulation coupling module through a second movable end of the single-pole double-throw circuit change-over switch;

the modulation coupling module is configured to adjust an amplitude of a main distortion signal in the second amplified transmission signal according to a main distortion signal in the first amplified transmission signal, adjust an amplitude of a main transmission signal in the second amplified transmission signal, perform phase adjustment on the first amplified transmission signal and/or the second amplified transmission signal, couple the first amplified transmission signal and the second amplified transmission signal to obtain a main transmission signal in the first amplified transmission signal, and transmit the main transmission signal.

Optionally, the modulation coupling module includes: the second low-noise amplifier, the fifth delayer and the fifth coupler; wherein the content of the first and second substances,

the second low-noise amplifier is configured to receive a second amplified transmission signal output by a second moving end of the single-pole double-throw circuit switch, adjust the amplitude of a main distortion signal in the second amplified transmission signal to be the same as the amplitude of a main distortion signal in the first amplified transmission signal, adjust the amplitude of the main distortion signal in the second amplified transmission signal to be smaller than a second preset value, and output the second amplified transmission signal after the amplitude adjustment to the fifth delay;

the fifth delayer is configured to adjust a phase of the second amplified transmission signal and output the adjusted phase to the fifth coupler; wherein the phase of the phase-adjusted second amplified transmission signal is opposite to the phase of the first amplified transmission signal;

the fifth coupler is configured to receive a first amplified transmission signal output by the stationary end of the single-pole double-throw circuit switch, couple the first amplified transmission signal with the second amplified transmission signal, obtain a main transmission signal in the first amplified transmission signal, and transmit the main transmission signal.

Optionally, the modulation coupling module includes: the second low-noise amplifier, the sixth delayer and the fifth coupler; wherein the content of the first and second substances,

the second low-noise amplifier is configured to receive a second amplified transmission signal output by a second moving end of the single-pole double-throw circuit switch, adjust the amplitude of a main distortion signal in the second amplified transmission signal to be the same as the amplitude of a main distortion signal in the first amplified transmission signal, adjust the amplitude of the main distortion signal in the second amplified transmission signal to be smaller than a second preset value, and output the second amplified transmission signal after the amplitude adjustment to the fifth coupler;

the sixth delayer is configured to receive the first amplified transmission signal output by the stationary end of the single-pole double-throw circuit switch, and output the first amplified transmission signal to the fifth coupler after adjusting the phase of the first amplified transmission signal; wherein the phase of the first amplified transmission signal after the phase adjustment is opposite to the phase of the second amplified transmission signal;

the fifth coupler is configured to couple the first amplified transmission signal with the second amplified transmission signal to obtain a main transmission signal in the first amplified transmission signal, and transmit the main transmission signal.

Optionally, the modulation coupling module includes: the second low-noise amplifier, the fifth delayer, the sixth delayer and the fifth coupler; wherein the content of the first and second substances,

the fifth delayer is configured to adjust a phase of the second amplified transmission signal and output the adjusted phase to the fifth coupler; the sixth delayer is configured to receive the first amplified transmission signal output by the stationary end of the single-pole double-throw circuit switch, and output the first amplified transmission signal to the fifth coupler after adjusting the phase of the first amplified transmission signal; wherein the phase of the phase-adjusted first amplified transmission signal is opposite to the phase of the phase-adjusted second amplified transmission signal;

Optionally, the single-pole double-throw circuit switcher is further configured to connect the stationary terminal and the first moving terminal when TDD is in a transmission timeslot, couple the amplified transmission signal output by the radio frequency power amplifier into the first amplified transmission signal and the second amplified transmission signal, output the first amplified transmission signal to the modulation coupling module through the stationary terminal, and output the second amplified transmission signal to the modulation coupling module through the second moving terminal; when the TDD is in a receiving time slot, the fixed end is connected with the second movable end, and a received receiving signal is output to the second low-noise amplifier;

the second low noise amplifier is further configured to amplify the received signal.

Optionally, the signal transceiving front-end circuit further includes:

the control module is used for adjusting the working state of the second low-noise amplifier to a third working state when the TDD is in a time slot for sending and adjusting the working state of the second low-noise amplifier to a fourth working state when the TDD is in a time slot for receiving;

the second low-noise amplifier is configured to adjust, in the third operating state, the amplitude of a distortion signal in the second amplified transmission signal to be the same as the amplitude of a main distortion signal in the first amplified transmission signal, and adjust, in the third operating state, the amplitude of a main transmission signal in the second amplified transmission signal to be smaller than a second preset value; and adjusting the amplitude of the received signal to a third preset value in the fourth working state.

The signal transceiving front-end circuit provided by the embodiment of the invention can acquire the main distortion signal in the amplified transmission signal amplified by the radio frequency power amplifier and offset the main distortion in the amplified transmission signal to obtain the amplified and high-linearity main transmission signal corresponding to the initial transmission signal, thereby improving the linearity of the signal transceiving front-end circuit.

In addition, the low-noise amplifier in the modulation coupling module of the embodiment of the invention can not only amplify the distorted signal, but also amplify the received signal. When the received signal is amplified, an additional low-noise amplifier is not needed, and the cost is saved. The embodiment of the invention also provides a simpler signal transceiving front-end circuit, which improves the linearity of the signal transceiving front-end circuit, has simple circuit form and strong practicability, and can coexist with other linearity improving circuits.

Drawings

Fig. 1 is a schematic structural diagram of a signal transceiving front-end circuit according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a distortion signal extraction module according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of another distorted signal extraction module according to an embodiment of the present invention;

fig. 4 is a schematic circuit diagram of another distorted signal extraction module according to an embodiment of the present invention;

fig. 5 is a schematic circuit diagram of a modulation coupling module according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of another modulation coupling module according to an embodiment of the present invention;

fig. 7 is a schematic circuit diagram of another modulation coupling module according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a signal transceiving front-end circuit according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a signal transceiving front-end circuit according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a signal transceiving front-end circuit according to an embodiment of the present invention;

fig. 11 is a schematic circuit diagram of a modulation coupling module according to an embodiment of the present invention;

fig. 12 is a schematic circuit diagram of another modulation coupling module according to an embodiment of the present invention;

fig. 13 is a schematic circuit diagram of another modulation coupling module according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a signal transceiving front-end circuit according to an embodiment of the present invention;

fig. 15 is a schematic structural diagram of a signal transceiving front-end circuit according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The term "and/or" in the embodiments of the present invention describes an association relationship of associated objects, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

The application scenario described in the embodiment of the present invention is for more clearly illustrating the technical solution of the embodiment of the present invention, and does not form a limitation on the technical solution provided in the embodiment of the present invention, and it can be known by a person skilled in the art that with the occurrence of a new application scenario, the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems.

When a wireless communication system transmits a signal, the signal is usually amplified, filtered, and the like by a signal transmission/reception front-end circuit, and the processed signal is transmitted. When a transmission signal is amplified, a radio frequency power amplifier is generally used for amplification, but the transmission signal amplified by the radio frequency power amplifier is seriously distorted, so that the linearity of a signal transceiving front-end circuit is poor. In order to improve the linearity of the signal transceiving front-end circuit, an embodiment of the present invention provides a signal transceiving front-end circuit.

Example 1

Fig. 1 shows a front-end circuit for transceiving signals according to an embodiment of the present invention, which includes: first coupler 11, radio frequency power amplifier 12, distorted signal extraction module 13, modulation coupling module 14, wherein:

the first coupler 11 is configured to couple an initial transmission signal to be transmitted into a first initial transmission signal and a second initial transmission signal, output the first initial transmission signal to the radio frequency power amplifier 12, and output the second initial transmission signal to the distortion signal extraction module 13;

the radio frequency power amplifier 12 is configured to amplify the first initial transmitting signal to obtain an amplified transmitting signal including an amplified main transmitting signal and a main distortion signal, and output the amplified transmitting signal to the distortion signal extraction module 13;

a distorted signal extraction module 13, configured to couple the amplified transmission signal into a first amplified transmission signal and a second amplified transmission signal; after signal modulation processing is performed on the first amplified transmission signal and/or the second initial transmission signal, the first amplified transmission signal and the second initial transmission signal are coupled to obtain a modulation distortion signal, and the modulation distortion signal is output to the modulation coupling module 14; and outputs the second amplified transmission signal to the modulation coupling module 14;

and the modulation coupling module 14 is configured to adjust the amplitude of the modulation distortion signal according to the main distortion signal in the second amplified transmission signal, perform phase adjustment on the second amplified transmission signal and/or the modulation distortion signal, couple the second amplified transmission signal with the modulation distortion signal to obtain a main transmission signal in the second amplified transmission signal, and transmit the main transmission signal.

In the embodiment of the invention, an initial transmitting signal is coupled into a first initial transmitting signal and a second initial transmitting signal through a first coupler, the second initial transmitting signal is amplified through a radio frequency power amplifier to obtain an amplified transmitting signal, and the amplified transmitting signal comprises a main transmitting signal and a main distortion signal; then, coupling the amplified transmission signal into a first amplified transmission signal and a second amplified transmission signal through a distortion signal extraction module, and modulating the first amplified transmission signal and the second initial transmission signal, wherein when the modulated first amplified transmission signal and the second initial transmission signal are coupled, a main transmission signal contained in the first amplified transmission signal is coupled to be zero, so that a main distortion signal, namely a modulation distortion signal, in the first amplified transmission signal is obtained; and then, adjusting the amplitude of the modulation distortion signal by a modulation coupling module, adjusting the phase of the modulation distortion signal and the phase of the second amplification transmitting signal, and when the adjusted modulation distortion signal is coupled with the second amplification transmitting signal, coupling the main distortion signal in the second amplification transmitting signal to zero to obtain the main transmitting signal in the second amplification transmitting signal and transmitting the main transmitting signal. The circuit provided by the embodiment of the invention can acquire the main distortion signal in the amplified transmitting signal amplified by the radio frequency power amplifier and offset the main distortion in the amplified transmitting signal to obtain the amplified main transmitting signal with higher linearity corresponding to the initial transmitting signal, thereby improving the linearity of the signal transceiving front-end circuit.

It should be noted that, in the embodiment of the present invention, when the first coupler 11 couples the initial transmission signal into the first initial transmission signal and the second initial transmission signal, because the first initial transmission signal is used to transmit a signal, the amplitude of the first initial transmission signal obtained by coupling may be greater than that of the second initial transmission signal, and the second initial transmission signal is used to obtain a modulation distortion signal and may be a small part of the initial transmission signal.

One end of the first coupler 11 is connected to the rf power amplifier 12, and the first coupler 11 outputs the first initial transmission signal to the rf power amplifier 12; the other end of the first coupler 11 is connected with the distorted signal extraction module 13, and the first coupler 11 outputs the second initial transmission signal to the distorted signal extraction module 13;

the radio frequency power amplifier 12 amplifies the first initial transmission signal to obtain an amplified transmission signal, and when the first initial transmission signal is amplified, a distortion signal occurs, so that the amplified transmission signal includes a main transmission signal and a main distortion signal.

The rf power amplifier 12 outputs the amplified transmission signal to the distorted signal extraction module 13, and the distorted signal extraction module 13 extracts the modulation distortion signal from the main distortion signal according to the second initial transmission signal.

The distorted signal extracting module 13 according to the embodiment of the present invention is described in detail as follows:

1. as shown in fig. 2, a circuit structure diagram of a distortion signal extraction module 13 according to an embodiment of the present invention is provided. The distorted signal extraction block 13 includes: a second coupler 131, a first delayer 132, a third coupler 133;

wherein, the input end of the second coupler 131 is connected with the output end of the radio frequency power amplifier 12, and is used for receiving and amplifying the transmission signal; an output terminal of the second coupler 131 is connected to an input terminal of the third coupler 133 for outputting the first amplified transmission signal to the third coupler 133; the other output end of the second coupler 131 is connected to the modulation coupling module 14, and is configured to output the second amplified transmission signal to the modulation coupling module 14; one end of the first delay 132 is connected to one output end of the first coupler 11, for receiving the second initial transmission signal; the other end of the first delay 132 is connected to an input end of the third coupler 133, and is configured to output the phase-adjusted second initial transmission signal to the third coupler 133; the output end of the third coupler 133 is connected to the modulation coupling module 14, and is configured to output the modulation distortion signal to the modulation coupling module 14.

The second coupler 131 is configured to couple the amplified transmission signal into a first amplified transmission signal and a second amplified transmission signal, output the first amplified transmission signal to the third coupler 133, and output the second amplified transmission signal to the modulation coupling module 14.

It should be noted that, in the embodiment of the present invention, when the second coupler 131 couples the amplified transmission signal into the first amplified transmission signal and the second amplified transmission signal, because the second amplified transmission signal is used for transmitting signals, the amplitude of the coupled second amplified transmission signal may be greater than that of the first amplified transmission signal, and the first amplified transmission signal is used for acquiring the modulation distortion signal and may be a small part of the amplified transmission signal.

And a first delay 132, configured to receive the second initial amplified signal output by the first coupler 11, and output a phase-adjusted second initial transmit signal to the third coupler 133, where the phase of the phase-adjusted second initial transmit signal is opposite to the phase of the first amplified transmit signal.

In particular, the phase of the phase-adjusted second initial transmit signal may be 180 ° out of phase with the phase of the first amplified transmit signal.

The third coupler 133 is configured to adjust the amplitudes of the first amplified transmission signal and the second initial transmission signal to be the same, couple the first amplified transmission signal and the second initial transmission signal to obtain a modulation distortion signal, and output the modulation distortion signal to the modulation coupling module 14.

Specifically, the third coupler 133 adjusts the amplitudes of the main signal and the second initial transmitting signal in the first amplified transmitting signal to be the same amplitude, so as to obtain the first amplified transmitting signal and the second initial transmitting signal which have the same amplitude and opposite phases, and the third coupler 133 couples the first amplified transmitting signal and the second initial transmitting signal to obtain the modulation distortion signal and outputs the modulation distortion signal to the modulation coupling module 14.

2. As shown in fig. 3, a circuit structure diagram of another distorted signal extracting module 13 according to an embodiment of the present invention is provided. The distorted signal extraction block 13 includes: a second coupler 131, a second delayer 134, and a third coupler 133;

wherein, the input end of the second coupler 131 is connected with the output end of the radio frequency power amplifier 12, and is used for receiving and amplifying the transmission signal; an output terminal of the second coupler 131 is connected to one terminal of the second delayer 134, and is configured to output the first amplified transmission signal to the second delayer 134; the other output end of the second coupler 131 is connected to the modulation coupling module 14, and is configured to output the second amplified transmission signal to the modulation coupling module 14; the other end of the second delay 134 is connected to an input end of the third coupler 133, and is configured to output the phase-adjusted first amplified transmission signal to the third coupler 133; the other input terminal of the third coupler 133 is connected to an output terminal of the first coupler 11 for receiving the second initial transmission signal; the output end of the third coupler 133 is connected to the modulation coupling module 14, and is configured to output the modulation distortion signal to the modulation coupling module 14.

The second coupler 131 is configured to couple the amplified transmission signal into a first amplified transmission signal and a second amplified transmission signal, output the first amplified transmission signal to the second delay 134, and output the second amplified transmission signal to the modulation coupling module 14.

And a second delayer 134, configured to output the phase-adjusted first amplified transmission signal to the third coupler 133, where the phase of the phase-adjusted first amplified transmission signal is opposite to the phase of the second initial transmission signal.

In particular, the phase of the phase-adjusted first amplified transmission signal and the phase of the second initial transmission signal may differ by 180 °.

The third coupler 133 is configured to receive the second initial transmitting signal output by the first coupler 11, adjust the amplitudes of the first amplified transmitting signal and the second initial transmitting signal to be the same, couple the first amplified transmitting signal and the second initial transmitting signal to obtain a modulation distortion signal, and output the modulation distortion signal to the modulation coupling module 14.

3. As shown in fig. 4, a circuit structure diagram of another distorted signal extracting module 13 according to an embodiment of the present invention is provided. The distorted signal extraction block 13 includes: a second coupler 131, a first delayer 132, a second delayer 134, and a third coupler 133;

wherein, the input end of the second coupler 131 is connected with the output end of the radio frequency power amplifier 12, and is used for receiving and amplifying the transmission signal; an output terminal of the second coupler 131 is connected to one terminal of the second delayer 134, and is configured to output the first amplified transmission signal to the second delayer 134; the other output end of the second coupler 131 is connected to the modulation coupling module 14, and is configured to output the second amplified transmission signal to the modulation coupling module 14; one end of the first delay 132 is connected to one output end of the first coupler 11, for receiving the second initial transmission signal; the other end of the first delay 132 is connected to an output end of the third coupler 133, and is configured to output the phase-adjusted second initial transmission signal to the third coupler 133; the other end of the second delay 134 is connected to the other input end of the third coupler 133, and is configured to output the phase-adjusted first amplified transmission signal to the third coupler 133; the output end of the third coupler 133 is connected to the modulation coupling module 14, and is configured to output the modulation distortion signal to the modulation coupling module 14.

A first delay 132, configured to receive the second initial transmitting signal output by the first coupler, and output the second initial transmitting signal to the third coupler 133 after adjusting the phase of the second initial transmitting signal;

a second delayer 134, configured to adjust a phase of the first amplified transmission signal and output the adjusted phase to the third coupler 133;

wherein the phase of the phase-adjusted first amplified transmission signal is opposite to the phase of the second initial transmission signal. In particular, the phase of the phase-adjusted first amplified transmission signal and the phase of the second initial transmission signal may differ by 180 °.

It should be noted that the structures of the three distorted signal extraction modules 13 provided in the embodiment of the present invention are only schematic, the structures of the distorted signal extraction modules 13 are not limited to the three structures, and the three structures do not limit the protection scope of the embodiment of the present invention.

The distortion signal extraction module outputs the second amplified transmission signal and the modulation distortion signal to the modulation coupling module 14, the modulation coupling module 14 adjusts the amplitude of the modulation distortion signal according to the main distortion signal in the second amplified transmission signal, adjusts the phase of the second amplified transmission signal and the modulation distortion signal to obtain the second amplified transmission signal and the modulation distortion signal which are equal in amplitude and opposite in phase, couples the second amplified transmission signal and the modulation distortion signal to obtain the main transmission signal in the second amplified transmission signal, and transmits the main transmission signal.

The following describes the modulation coupling module 14 according to an embodiment of the present invention in detail:

1. as shown in fig. 5, a circuit structure of a modulation coupling module 14 according to an embodiment of the present invention is provided. The modulation coupling module 14 includes: a first low noise amplifier 141, a third delay 142, and a fourth coupler 143;

wherein, the input terminal of the first low noise amplifier 141 is connected to the output terminal of the third coupler 133, for receiving the modulation distortion signal; the output end of the first low-noise amplifier 141 is connected to one input end of the fourth coupler 143, and is configured to output the amplitude-adjusted modulation distortion signal; one end of the third delay 142 is connected to an output end of the second coupler 131, and is configured to receive the second amplified transmission signal; the other end of the third delay 142 is connected to the other input end of the fourth coupler 143, and is configured to output the phase-adjusted second amplified transmission signal; the output of the fourth coupler 143 is used to transmit the main transmit signal.

The first low-noise amplifier 141, configured to receive the modulation distortion signal output by the distortion signal extraction module 13, adjust the amplitude of the modulation distortion signal to be the same as the amplitude of the main distortion signal in the second amplified transmission signal, and output the modulation distortion signal after amplitude adjustment to the fourth coupler 143; .

It should be noted that, in the embodiment of the present invention, the first low-noise amplifier 141 may also generate distortion when amplifying the modulation distortion signal, but because the amplitude of the modulation distortion signal is smaller, the amplitude of the secondary distortion signal generated in the process of amplifying the modulation distortion signal is smaller, and within the error allowable range, the secondary distortion signal may be ignored, and the degree of distortion of the main transmission signal obtained by coupling the modulation distortion signal after amplitude adjustment and the second amplified transmission signal is smaller, and the linearity is better.

The third delay 142 is configured to receive the second amplified transmission signal output by the distorted signal extraction module, adjust the phase of the second amplified transmission signal, and output the adjusted phase to the fourth coupler 143; the phase of the second amplified transmission signal after phase adjustment is opposite to the phase of the modulation distortion signal;

specifically, the phase of the phase-adjusted second initial transmission signal may be different from the phase of the modulation distortion signal by 180 °.

And a fourth coupler 143, configured to couple the second amplified transmission signal with the modulation distortion signal to obtain a main transmission signal in the second amplified transmission signal, and transmit the main transmission signal.

Specifically, the amplitude of the main distortion signal and the amplitude of the modulation distortion signal in the second amplified transmission signal received by the fourth coupler 143 are the same, and the phases are opposite, and the fourth coupler 143 couples the second amplified transmission signal and the modulation distortion signal to obtain the main transmission signal in the second amplified transmission signal, and transmits the main transmission signal.

2. As shown in fig. 6, a circuit structure of another modulation coupling module 14 according to an embodiment of the present invention is provided. The modulation coupling module 14 includes: a first low noise amplifier 141, a fourth delay 144, and a fourth coupler 143;

wherein, the input terminal of the first low noise amplifier 141 is connected to the output terminal of the third coupler 133, for receiving the modulation distortion signal; the output end of the first low-noise amplifier 141 is connected to one end of the fourth delay 144, and is configured to output the amplitude-adjusted modulation distortion signal; the other end of the fourth delay 144 is connected to an input end of the fourth coupler 143, and is configured to output the phase-adjusted modulation distortion signal; the other input terminal of the fourth coupler 143 is connected to an output terminal of the second coupler 131, for receiving the second amplified transmission signal; the output of the fourth coupler 143 is used to transmit the main transmit signal.

The first low-noise amplifier 141 is configured to receive the modulation distortion signal output by the distortion signal extraction module 13, adjust the amplitude of the modulation distortion signal to be the same as the amplitude of the main distortion signal in the second amplified transmission signal, and output the modulation distortion signal after the amplitude adjustment to the fourth delay 144.

A fourth delay 144, configured to adjust the phase of the modulation distortion signal and output the adjusted phase to the fourth coupler 143; wherein the phase of the modulated distortion signal after phase adjustment is opposite to the phase of the second amplified transmission signal;

specifically, the phase of the phase-adjusted modulation distortion signal may be different from the phase of the second initial transmission signal by 180 °.

And the fourth coupler 143 is configured to receive the second amplified transmission signal output by the distorted signal extraction module, couple the second amplified transmission signal with the modulation distorted signal, obtain a main transmission signal in the second amplified transmission signal, and transmit the main transmission signal.

3. As shown in fig. 7, a circuit structure of another modulation coupling module 14 according to an embodiment of the present invention is provided. The modulation coupling module 14 includes: a first low noise amplifier 141, a third delay 142, a fourth delay 144, and a fourth coupler 143;

wherein, the input terminal of the first low noise amplifier 141 is connected to the output terminal of the third coupler 133, for receiving the modulation distortion signal; the output end of the first low-noise amplifier 141 is connected to one end of the fourth delay 144, and is configured to output the amplitude-adjusted modulation distortion signal; the other end of the fourth delay 144 is connected to an input end of the fourth coupler 143, and is configured to output the phase-adjusted modulation distortion signal; one end of the third delay 142 is connected to an output end of the second coupler 131, and is configured to receive the second amplified transmission signal; the other end of the third delay 142 is connected to the other input end of the fourth coupler 143, and is configured to output the phase-adjusted second amplified transmission signal; the output of the fourth coupler 143 is used to transmit the main transmit signal.

The first low-noise amplifier 141, configured to receive the modulation distortion signal output by the distortion signal extraction module 13, adjust the amplitude of the modulation distortion signal to be the same as the amplitude of the main distortion signal in the second amplified transmission signal, and output the modulation distortion signal after amplitude adjustment to the fourth delay 144; .

The third delay 142 is configured to receive the second amplified transmission signal output by the distorted signal extraction module 13, adjust the phase of the second amplified transmission signal, and output the adjusted phase to the fourth coupler 143;

a fourth delay 144, configured to adjust the phase of the modulation distortion signal and output the adjusted phase to the fourth coupler 143;

wherein the phase of the modulated distortion signal after phase adjustment is opposite to the phase of the second amplified transmission signal after phase adjustment; specifically, the phase of the phase-adjusted modulation distortion signal may be different from the phase of the second initial transmission signal by 180 °.

It should be noted that the three structures of the modulation coupling module 14 provided in the embodiment of the present invention are only schematic, the structures of the modulation coupling module 14 are not limited to the three structures, and the three structures do not limit the protection scope of the embodiment of the present invention.

The structures of the three distorted signal extraction modules 13 and the structures of the three modulation coupling modules 14 provided in the embodiment of the present invention can be combined at will, and both the functions of the signal transceiving front-end circuit provided in the embodiment of the present invention can be realized.

An optional implementation manner is that, the signal transceiving front-end circuit provided in the embodiment of the present invention further includes: a single-pole double-throw circuit transfer switch 15; a first moving end of the single-pole double-throw circuit change-over switch 15 is connected with an output end of a second coupler 131 in the distortion signal extraction module, a second moving end of the single-pole double-throw circuit change-over switch 15 is connected with an input end of a first low-noise amplifier 141, and a fixed end of the single-pole double-throw circuit change-over switch is connected with the modulation coupling module 14;

the single-pole double-throw circuit change-over switch 15 is used for connecting the fixed end with the first movable end when the TDD is in a transmit timeslot, and outputting the second amplified transmit signal output by the second coupler 131 to the modulation coupling module 14; when the TDD is in a receive timeslot, the stationary terminal is connected to the second moving terminal, and the received receive signal is output to the first low-noise amplifier 141;

the first low noise amplifier 141 is also configured to amplify the received signal.

As shown in fig. 8, a schematic structural diagram of a signal transceiving front-end circuit according to an embodiment of the present invention is provided, in which a circuit structure of a first type of distorted signal extraction module is adopted for the distorted signal extraction module 13, and a circuit structure of a first type of modulation coupling module is adopted for the modulation coupling module 14 as an example. The signal transceiving function is realized by the circuit connection, and the first low noise amplifier 141 is configured to amplify the received reception signal in the time slot.

An optional implementation manner is that, the signal transceiving front-end circuit provided in the embodiment of the present invention further includes: the control module 16 is configured to adjust the operating state of the first low noise amplifier 141 to a first operating state when the TDD is in the transmit timeslot, and adjust the operating state of the first low noise amplifier 141 to a second operating state when the TDD is in the receive timeslot.

In the first operating state, the first low-noise amplifier 141 is configured to adjust the amplitude of the modulation distortion signal to be the same as the amplitude of the main distortion signal; in the second operating state, the first low noise amplifier 141 is configured to adjust the amplitude of the received signal to a first preset value.

Specifically, the control module 16 controls the operating state of the first low noise amplifier 141 by controlling the drain voltage, the gate voltage, and the like of the first low noise amplifier 141.

The low-noise amplifier in the embodiment of the invention can not only amplify the modulation distortion signal, but also amplify the received signal. When the received signal is amplified, an additional low-noise amplifier is not needed, and the cost is saved.

As shown in fig. 9, which is a schematic structural diagram of a signal transceiving front-end circuit according to an embodiment of the present invention, wherein the control module 16 is configured to control an operating state of the first low noise amplifier 141.

Optionally, the signal transceiving front-end circuit provided in the embodiment of the present invention further includes: a filter 17 for performing filtering processing on the main transmission signal or the reception signal; an antenna 18 for transmitting a main transmission signal or receiving a reception signal.

It should be noted that, during the receiving time slot, the antenna 18 receives the received signal and outputs the received signal to the filter 17, the filter 17 performs filtering processing on the received signal and outputs the filtered received signal to the stationary end of the single-pole double-throw circuit switch 15, and the stationary end of the single-pole double-throw circuit switch 15 is connected to the second stationary end and is configured to output the received filtered received signal to the first low noise amplifier 141. In the schematic structural diagram of the front-end circuit for transceiving signals shown in fig. 9, the filtered received signal may pass through the fourth coupler 142 and the third delay 142 of the modulation coupling module 14, the received signal is less affected by the fourth coupler 143 and the third delay 142, and the insertion loss of the received signal in the error tolerance range is negligible.

Example 2

In order to improve the linearity of the signal transceiving front-end circuit, an embodiment of the present application further provides a signal transceiving front-end circuit.

Fig. 10 shows a front-end circuit for transceiving signals according to an embodiment of the present invention, which includes: radio frequency power amplifier 21, single-pole double-throw circuit change over switch 22, modulation coupling module 23, wherein:

the radio frequency power amplifier 21 is configured to amplify an initial transmitting signal to be transmitted to obtain an amplified transmitting signal including an amplified main transmitting signal and a main distortion signal, and output the amplified transmitting signal to a first moving end of the single-pole double-throw circuit switch;

the single-pole double-throw circuit change-over switch 22 is used for coupling the amplified transmission signal into a first amplified transmission signal and a second amplified transmission signal, outputting the first amplified transmission signal to the modulation coupling module 23 through the immobile end of the single-pole double-throw circuit change-over switch 22, which is connected with the first mobile end, and outputting the second amplified transmission signal to the modulation coupling module 23 through the second mobile end of the single-pole double-throw circuit change-over switch 22;

and the modulation coupling module 23 is configured to adjust the amplitude of the main distortion signal in the second amplified transmission signal according to the main distortion signal in the first amplified transmission signal, adjust the amplitude of the main transmission signal in the second amplified transmission signal, perform phase adjustment on the first amplified transmission signal and/or the second amplified transmission signal, couple the first amplified transmission signal and the second amplified transmission signal to obtain the main transmission signal in the first amplified transmission signal, and transmit the main transmission signal.

In the embodiment of the invention, the amplified transmission signal is coupled into the first amplified transmission signal and the second amplified transmission signal through the single-pole double-throw circuit change-over switch, the amplitude of the main distortion signal in the second amplified transmission signal is adjusted to be equal to the amplitude of the main distortion signal in the first amplified transmission signal through the modulation coupling module, the amplitude of the main transmission signal in the second amplified transmission signal is adjusted to be smaller, the phases of the first amplified transmission signal and the second amplified transmission signal are adjusted, the first amplified transmission signal is coupled with the second amplified transmission signal to obtain the main transmission signal in the first amplified transmission signal, and the main transmission signal is transmitted. By the circuit provided by the embodiment of the invention, the main distortion signal in the first amplified transmission signal can be coupled through the main distortion signal in the second amplified transmission signal, the main distortion signal in the first amplified transmission signal is offset, the amplified main transmission signal with higher linearity corresponding to the initial transmission signal is obtained, the linearity of the signal transceiving front-end circuit is improved, the circuit form is simple, the practicability is high, and the circuit can coexist with other linearity improving circuits.

It should be noted that, in actual production, since a single-pole double-throw switch or a circulator is not an ideal device, a certain degree of coupling exists. In the embodiment of the present invention, the coupling degree of the single-pole double-throw switch is utilized, the amplified transmission signal output by the radio frequency power amplifier is coupled into the first amplified transmission signal and the second amplified transmission signal through the single-pole double-throw circuit transfer switch, the first amplified transmission signal is output to the modulation coupling module 23 through the stationary end of the single-pole double-throw circuit transfer switch 22 connected with the first moving end, and the second amplified transmission signal is output to the modulation coupling module 23 through the second moving end of the single-pole double-throw circuit transfer switch 22.

In the embodiment of the present invention, when the single-pole double-throw circuit transfer switch 22 couples the amplified transmission signal into the first amplified transmission signal and the second amplified transmission signal, because the first amplified transmission signal is used for transmitting signals, the amplitude of the coupled second amplified transmission signal may be smaller than that of the first amplified transmission signal, and the second amplified transmission signal may be a small part of the amplified transmission signal.

The following describes the modulation coupling module 23 according to an embodiment of the present invention in detail:

1. as shown in fig. 11, a circuit structure of a modulation coupling module 23 according to an embodiment of the present invention is provided. The modulation coupling module 23 includes: a second low noise amplifier 231, a fifth delay 232, and a fifth coupler 233;

the input end of the second low-noise amplifier 231 is connected to the second moving end of the single-pole double-throw circuit transfer switch 22, and is configured to receive a second amplified transmission signal; the output end of the second low-noise amplifier 231 is connected with one end of the fifth delay 232, and is used for outputting the amplitude-adjusted second amplified transmission signal; the other end of the fifth delay 232 is connected to an input end of the fifth coupler 233, and is configured to output the phase-adjusted second amplified transmission signal; the other input end of the fifth coupler 233 is connected to the stationary end of the single-pole double-throw circuit switch 22, and is configured to receive the first amplified transmission signal; the output of the fifth coupler 233 is used to transmit the main transmit signal.

The second low-noise amplifier 231 is configured to receive the second amplified transmission signal output by the second moving end of the single-pole double-throw circuit switcher 22, adjust the amplitude of the main distortion signal in the second amplified transmission signal to be the same as the amplitude of the main distortion signal in the first amplified transmission signal, adjust the amplitude of the main distortion signal in the second amplified transmission signal to be smaller than a second preset value, and output the second amplified transmission signal after the amplitude adjustment to the fifth delay 232.

It should be noted that, in the embodiment of the present invention, when the operating state of the second low-noise amplifier 231 is in the strong distortion state, the amplitude of the main distortion signal in the second amplified transmission signal may be adjusted to be larger, and the amplitude of the main distortion signal in the second amplified transmission signal may be adjusted to be smaller, specifically, the amplitude of the main distortion signal in the second amplified transmission signal is adjusted to be the same as the amplitude of the main distortion signal in the first amplified transmission signal, and the amplitude of the main distortion signal in the second amplified transmission signal is adjusted to be smaller than the second preset value.

Wherein the strong distortion state of the second low noise amplifier 231 may be a C-class state.

A fifth delay 232, configured to adjust a phase of the second amplified transmission signal and output the adjusted phase to the fifth coupler; wherein the phase of the phase-adjusted second amplified transmission signal is opposite to the phase of the first amplified transmission signal;

in particular, the phase of the phase adjusted second amplified transmission signal may differ by 180 ° from the phase of the first amplified transmission signal.

The fifth coupler 233 is configured to receive the first amplified transmission signal output by the stationary end of the single-pole double-throw circuit switch 22, couple the first amplified transmission signal with the second amplified transmission signal, obtain a main transmission signal in the first amplified transmission signal, and transmit the main transmission signal.

Specifically, the amplitude of the main distortion signal in the second amplified transmission signal received by the fifth coupler 233 is the same as the amplitude of the main distortion signal in the first amplified transmission signal, and the phases of the main distortion signal in the first amplified transmission signal are opposite to each other, and the fifth coupler 233 couples the second amplified transmission signal with the first amplified transmission signal to obtain the main transmission signal in the first amplified transmission signal, and transmits the main transmission signal.

It should be noted that although there is a small portion of the main transmission signal in the second amplified transmission signal after the amplitude and phase adjustment, the coupling effect on the main transmission signal is negligible when the second amplified transmission signal is coupled with the first amplified transmission signal within the allowable error range due to the small signal.

2. As shown in fig. 12, a circuit structure of a modulation coupling module 23 according to an embodiment of the present invention is provided. The modulation coupling module 23 includes: a second low noise amplifier 231, a sixth delay 234, a fifth coupler 233;

the input end of the second low-noise amplifier 231 is connected to the second moving end of the single-pole double-throw circuit transfer switch 22, and is configured to receive a second amplified transmission signal; the output end of the second low-noise amplifier 231 is connected to one input end of the fifth coupler 233, and is configured to output the amplitude-adjusted second amplified transmission signal; one end of the sixth delay 234 is connected to the stationary end of the single-pole double-throw circuit switch 22 for receiving the first amplified transmission signal; the other end of the sixth delay 234 is connected to the other input end of the fifth coupler 233, and is configured to output the phase-adjusted first amplified transmission signal; the output of the fifth coupler 233 is used to transmit the main transmit signal.

The second low-noise amplifier 231 is configured to receive the second amplified transmission signal output by the second moving terminal of the single-pole double-throw circuit switcher 22, adjust the amplitude of the main distortion signal in the second amplified transmission signal to be the same as the amplitude of the main distortion signal in the first amplified transmission signal, adjust the amplitude of the main distortion signal in the second amplified transmission signal to be smaller than a second preset value, and output the second amplified transmission signal after the amplitude adjustment to the fifth coupler 233.

A sixth delay 234, configured to receive the first amplified transmission signal output by the stationary terminal of the single-pole double-throw circuit switcher 22, adjust a phase of the first amplified transmission signal, and output the adjusted phase to the fifth coupler 233; wherein the phase of the phase-adjusted first amplified transmission signal is opposite to the phase of the second amplified transmission signal;

in particular, the phase of the phase adjusted first amplified transmission signal and the phase of the second amplified transmission signal may differ by 180 °.

And a fifth coupler 233, configured to couple the first amplified transmission signal with the second amplified transmission signal to obtain a main transmission signal in the first amplified transmission signal, and transmit the main transmission signal.

It should be noted that although there is a small portion of the main transmission signal in the amplitude-adjusted second amplified transmission signal, the coupling effect on the main transmission signal is negligible when coupling with the first amplified transmission signal within the allowable error range due to the small signal.

3. As shown in fig. 13, a circuit structure of a modulation coupling module 23 according to an embodiment of the present invention is provided. The modulation coupling module 23 includes: a second low noise amplifier 231, a fifth delay 232, a sixth delay 234, and a fifth coupler 233;

the input end of the second low-noise amplifier 231 is connected to the second moving end of the single-pole double-throw circuit transfer switch 22, and is configured to receive a second amplified transmission signal; the output end of the second low-noise amplifier 231 is connected with one end of the fifth delay 232, and is used for outputting the amplitude-adjusted second amplified transmission signal; the other end of the fifth delay 232 is connected to an input end of the fifth coupler 233, and is configured to output the phase-adjusted second amplified transmission signal; one end of the sixth delay 234 is connected to the stationary end of the single-pole double-throw circuit switch 22 for receiving the first amplified transmission signal; the other end of the sixth delay 234 is connected to the other input end of the fifth coupler 233, and is configured to output the phase-adjusted first amplified transmission signal; the output of the fifth coupler 233 is used to transmit the main transmit signal.

A fifth delay 232 for adjusting the phase of the second amplified transmission signal and outputting the adjusted phase to the fifth coupler 233; a sixth delay 234, configured to receive the first amplified transmission signal output by the stationary terminal of the single-pole double-throw circuit switcher 22, adjust a phase of the first amplified transmission signal, and output the adjusted phase to the fifth coupler 233; wherein the phase of the phase-adjusted first amplified transmission signal is opposite to the phase of the phase-adjusted second amplified transmission signal;

specifically, the phase of the phase-adjusted first amplified transmission signal and the phase of the phase-adjusted second amplified transmission signal may differ by 180 °.

It should be noted that the structures of the three modulation coupling modules 23 provided in the embodiment of the present invention are only schematic, the structures of the modulation coupling modules 23 are not limited to the three structures, and the three structures do not limit the protection scope of the embodiment of the present invention.

The structure of the three modulation coupling modules 23 provided by the embodiment of the present invention can be combined with the radio frequency power amplifier 21 and the single-pole double-throw circuit switch 22 at will, and the functions of the signal transceiving front-end circuit provided by the embodiment of the present invention can be realized.

An optional implementation manner is that, the single-pole double-throw circuit switcher 15 according to the embodiment of the present invention is further configured to connect the inactive end with the first active end when TDD is in a transmit timeslot, couple the amplified transmit signal output by the radio frequency power amplifier into a first amplified transmit signal and a second amplified transmit signal, output the first amplified transmit signal to the modulation coupling module 23 through the inactive end, and output the second amplified transmit signal to the modulation coupling module 23 through the second active end; when the TDD is in the receive timeslot, the stationary terminal is connected to the second moving terminal, and the received receive signal is output to the second low noise amplifier 231;

the second low noise amplifier 231 is also used for amplifying the received signal.

As shown in fig. 14, which is a schematic structural diagram of a signal transceiving front-end circuit according to an embodiment of the present invention, a modulation coupling module 23 adopts a circuit structure of a first modulation coupling module. The signal transceiving function is realized by the circuit connection, and the second low noise amplifier 231 is configured to amplify the received reception signal in the time slot.

An optional implementation manner is that, the signal transceiving front-end circuit provided in the embodiment of the present invention further includes: the control module 24 is configured to adjust the working state of the second low noise amplifier 231 to a third working state when the TDD is in the transmit timeslot, and adjust the working state of the second low noise amplifier 231 to a fourth working state when the TDD is in the receive timeslot.

In a third working state, the second low-noise amplifier 231 is configured to adjust the amplitude of the distortion signal in the second amplified transmission signal to be the same as the amplitude of the main distortion signal in the first amplified transmission signal, and adjust the amplitude of the main transmission signal in the second amplified transmission signal to be smaller than a second preset value;

in the fourth operating state, the second low noise amplifier 231 is configured to adjust the amplitude of the received signal to a third preset value.

It should be noted that the fourth operating state of the low noise amplifier 231 may be the same as the second operating state of the first low noise amplifier 141, and the third preset value may be the same as the first preset value.

Specifically, the control module 24 controls the operating state of the second low noise amplifier 231 by controlling the drain voltage, the gate voltage, and the like of the second low noise amplifier 231.

The low-noise amplifier in the embodiment of the invention can not only realize the amplification of the main distortion signal in the second amplified transmission signal, but also realize the amplification of the received signal. When the received signal is amplified, an additional low-noise amplifier is not needed, and the cost is saved.

Fig. 15 is a schematic structural diagram of a signal transceiving front-end circuit according to an embodiment of the present invention, wherein a control module 24 is configured to control an operating state of a second low noise amplifier 231.

Optionally, the signal transceiving front-end circuit provided in the embodiment of the present invention further includes: a filter 25 for performing filtering processing on the main transmission signal or the reception signal; an antenna 26 for transmitting a main transmission signal or receiving a reception signal.

It should be noted that, during the receiving time slot, the antenna 26 receives the received signal and outputs the received signal to the filter 25, the filter 25 performs filtering processing on the received signal and outputs the filtered received signal to the stationary end of the single-pole double-throw circuit switch 22, and the stationary end of the single-pole double-throw circuit switch 22 is connected to the second moving end and is configured to output the received filtered received signal to the second low noise amplifier 231. In the schematic structural diagram of the signal transceiving front-end circuit shown in fig. 15, the filtered received signal may pass through the fifth coupler 233 of the modulation coupling module 23, the received signal is less affected by the fifth coupler 233, and the insertion loss of the received signal in the error allowable range is negligible.

It should be understood that the division of the circuit modules in the embodiments of the present invention is only an example, and does not limit the protection scope of the embodiments of the present invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A signal transceiving front-end circuit, comprising: the device comprises a first coupler, a radio frequency power amplifier, a distortion signal extraction module and a modulation coupling module; wherein the content of the first and second substances,

2. The circuit of claim 1, wherein the distorted signal extraction module comprises: the second coupler, the first delayer and the third coupler; wherein the content of the first and second substances,

3. The circuit of claim 1, wherein the distorted signal extraction module comprises: a second coupler, a second delayer and a third coupler; wherein the content of the first and second substances,

4. The circuit of claim 1, wherein the distorted signal extraction module comprises: the second coupler, the first delayer, the second delayer and the third coupler; wherein the content of the first and second substances,

5. The circuit of claim 1, wherein the modulation coupling module comprises: a first low noise amplifier, a third delay, a fourth coupler, wherein,

the first low-noise amplifier is configured to receive the modulation distortion signal output by the distortion signal extraction module, adjust the amplitude of the modulation distortion signal to be the same as the amplitude of the main distortion signal in the second amplified transmission signal, and output the modulation distortion signal after amplitude adjustment to the fourth coupler;

6. The circuit of claim 1, wherein the modulation coupling module comprises: a first low noise amplifier, a fourth delay, a fourth coupler, wherein,

7. The circuit of claim 1, wherein the modulation coupling module comprises: a first low noise amplifier, a third delayer, a fourth coupler, wherein,

8. The circuit according to any one of claims 5 to 7, wherein the signal transceiving front-end circuit further comprises a single-pole double-throw circuit switch; the first movable end of the single-pole double-throw circuit change-over switch is connected with the output end of a second coupler in the distortion signal extraction module, the second movable end of the single-pole double-throw circuit change-over switch is connected with the input end of the first low-noise amplifier, and the immobile end of the single-pole double-throw circuit change-over switch is connected with the modulation coupling module;

the single-pole double-throw circuit change-over switch is used for connecting the fixed end with the first movable end when the TDD is in a transmission time slot, and outputting the second amplified transmission signal output by the second coupler to the modulation coupling module; when the TDD is in a receiving time slot, the fixed end is connected with the second movable end, and a received receiving signal is output to the first low-noise amplifier;

9. The circuit of claim 8, wherein the signal transceiving front-end circuit further comprises:

10. A signal transceiving front-end circuit, comprising: the radio frequency power amplifier, the single-pole double-throw circuit change-over switch and the modulation coupling module; wherein the content of the first and second substances,

11. The circuit of claim 10, wherein the modulation coupling module comprises: the second low-noise amplifier, the fifth delayer and the fifth coupler; wherein the content of the first and second substances,

12. The circuit of claim 10, wherein the modulation coupling module comprises: the second low-noise amplifier, the sixth delayer and the fifth coupler; wherein the content of the first and second substances,

13. The circuit of claim 10, wherein the modulation coupling module comprises: the second low-noise amplifier, the fifth delayer, the sixth delayer and the fifth coupler; wherein the content of the first and second substances,

14. The circuit according to any of claims 11 to 13, wherein the single-pole double-throw circuit switch is further configured to connect the stationary terminal to the first moving terminal when TDD is in a transmission timeslot, couple the amplified transmission signal output by the rf power amplifier into the first amplified transmission signal and a second amplified transmission signal, output the first amplified transmission signal to the modulation coupling module through the stationary terminal, and output the second amplified transmission signal to the modulation coupling module through the second moving terminal; when the TDD is in a receiving time slot, the fixed end is connected with the second movable end, and a received receiving signal is output to the second low-noise amplifier;

15. The circuit of claim 14, wherein the signal transceiving front-end circuit further comprises: