Receiving and transmitting multiplexing radio frequency TDD front-end circuit

Abstract

The utility model relates to a transceiving multiplexing radio frequency TDD front-end circuit, which comprises a transceiving change-over switch module, a mixer module, a receiving link, a transmitting link, a multiplexing link and a circulator, the transmitting link is connected with the mixer module and the multiplexing link through the transmitting-receiving change-over switch module, the multiplexing link is connected with the circulator and the receiving link through the transmitting-receiving change-over switch module, and the circulator is connected with the antenna through a filter; the mixer module is connected with the DAC and the ADC through the transmit-receive change-over switch module. And the receiving link is connected with the frequency mixer module and the multiplexing link through the transmitting-receiving change-over switch module. According to the utility model, through the multiplexing design, the space occupation of the radio frequency front end is significantly reduced, and the antenna is suitable for the application of miniaturized equipment; according to the invention, the number of used components is reduced, so that the overall cost is reduced, the multiplexing link is reasonably designed, the signal isolation and link performance are ensured, and the problem of signal interference possibly caused by multiplexing design is avoided.

Description

Technical Field

[0001] This utility model relates to the field of radio frequency communication technology, and in particular to a radio frequency TDD front-end circuit for transceiver multiplexing. Background Technology

[0002] In modern wireless communication devices, the radio frequency (RF) front-end module typically needs to support both signal transmission and reception simultaneously. In traditional designs, the transmission and reception channels are usually separate, leading to significant space requirements and high costs. With the miniaturization and increasing multifunctionality of devices, integrating more functions within a limited space has become an important research direction.

[0003] In existing technologies, some designs attempt to reduce the number of components and space occupation through link multiplexing, but the following problems still exist: 1. Insufficient space utilization: In existing designs, the multiplexing degree of the transmit and receive channels is limited, and a large number of independent components are still required; 2. High cost: Due to the insufficient optimization of the multiplexing design, the number of components has not been significantly reduced, resulting in a high overall cost; 3. Low functional integration: Existing designs are difficult to achieve multi-functional integration in a limited space, which cannot meet the needs of miniaturized devices. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a radio frequency TDD front-end circuit for transceiver multiplexing, thus solving the deficiencies of the prior art.

[0005] The purpose of this utility model is achieved through the following technical solution: a radio frequency TDD front-end circuit for multiplexing transmit and receive signals, which includes a transmit / receive switching module, a mixer module, a receive link, a transmit link, a multiplexing link, and a circulator;

[0006] The transmit link is connected to the mixer module and the multiplexing link through the transmit / receive switching module. The multiplexing link is connected to the circulator and the receive link through the transmit / receive switching module. The circulator is connected to the antenna through a filter. The mixer module is connected to the DAC and ADC through the transmit / receive switching module. The receive link is connected to the mixer module and the multiplexing link through the transmit / receive switching module.

[0007] The transmit / receive switching module includes a first transmit / receive switching switch, a second transmit / receive switching switch, a third transmit / receive switching switch, and a fourth transmit / receive switching switch;

[0008] The first transceiver switch is connected to the mixer module and the ADC and DAC respectively; the second transceiver switch is connected to the mixer module and the transmit link and the receive link respectively; the third transceiver switch is connected to the multiplexing link and the transmit link and the receive link respectively; and the fourth transceiver switch is connected to the multiplexing link, the receive link and the circulator respectively.

[0009] The mixer module includes an intermediate frequency filter, a mixer, and an RF filter connected in sequence; the intermediate frequency filter is connected to the ADC and DAC through a first transmit / receive switch, and the RF filter is connected to the transmit link and the receive link through a second transmit / receive switch.

[0010] The multiplexed link includes a low-noise amplifier, an automatic gain controller, a first amplifier, a digitally controlled attenuator, and a second amplifier connected in sequence; the low-noise amplifier is connected to the transmit link and the circulator via a third transmit / receive switch, and the second amplifier is connected to the receive link and the circulator via a fourth transmit / receive switch.

[0011] The input of the mixer is also connected to a first local oscillator filter, and the input of the first local oscillator filter is connected to the output of the local oscillator module.

[0012] The local oscillator module includes a third amplifier, a second local oscillator filter, a ping-pong switch, local oscillator source 1, local oscillator source 2, a power divider, a fourth amplifier, and a high-precision crystal oscillator. The output terminal of the high-precision crystal oscillator is connected to the input terminal of the fourth amplifier, the output terminal of the fourth amplifier is connected to the input terminal of the power divider, the output terminal of the power divider is connected to the input terminals of local oscillator source 1 and local oscillator source 2, local oscillator source 1 and local oscillator source 2 are connected to the ping-pong switch, the ping-pong switch is connected to the second local oscillator filter, the second local oscillator filter is connected to the third amplifier, and the third amplifier is connected to the first local oscillator filter.

[0013] This utility model has the following advantages: a transceiver multiplexed radio frequency TDD front-end circuit, through multiplexing design, significantly reduces the space occupied by the radio frequency front-end, making it suitable for applications in miniaturized devices; it reduces the number of components used, thereby reducing the overall cost; and through reasonable design of the multiplexing link, it ensures signal isolation and link performance, avoiding signal interference problems that may be caused by the multiplexing design. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the transmission mode of this utility model;

[0015] Figure 2 This is a schematic diagram of the receiving mode of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of this utility model used in different application scenarios. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of this application provided below with reference to the accompanying drawings is not intended to limit the scope of protection of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The present invention will be further described below with reference to the accompanying drawings.

[0018] This utility model specifically relates to a radio frequency TDD front-end circuit for transceiver multiplexing. It achieves efficient multiplexing of the transceiver channel through transceiver switching switches and a mixer module. Specifically, it includes multiple transceiver switching switches, a mixer module, a receive link, a transmit link, a multiplexing link, and a circulator. Among them, the transceiver switching switches are all 1-to-2 switches used to switch the signal path between transmit and receive modes. The mixer module is used to realize the frequency conversion of radio frequency signals. The receive link is used for processing received signals. The transmit link is used for processing transmitted signals. The multiplexing link is used to multiplex some components in the transceiver channel to reduce the use of independent components. The circulator is used to isolate the transmit and receive signals to avoid signal interference.

[0019] The transmit link is connected to the mixer module and the multiplexing link through the transmit / receive switching module. The multiplexing link is connected to the circulator and the receive link through the transmit / receive switching module. The circulator is connected to the antenna through a filter. The mixer module is connected to the DAC and ADC through the transmit / receive switching module. The receive link is connected to the mixer module and the multiplexing link through the transmit / receive switching module.

[0020] Furthermore, the transceiver switching module includes a first transceiver switching switch, a second transceiver switching switch, a third transceiver switching switch, and a fourth transceiver switching switch; the first transceiver switching switch is connected to the mixer module and the ADC and DAC respectively, the second transceiver switching switch is connected to the mixer module and the transmit link and the receive link respectively, the third transceiver switching switch is connected to the multiplexing link and the transmit link and the receive link respectively, and the fourth transceiver switching switch is connected to the multiplexing link, the receive link, and the circulator respectively.

[0021] Furthermore, the mixer module includes an intermediate frequency filter, a mixer, and an radio frequency filter connected in sequence; the intermediate frequency filter is connected to the ADC and DAC through a first transmit / receive switch, and the radio frequency filter is connected to the transmit link and the receive link through a second transmit / receive switch.

[0022] like Figure 1 As shown, in transmit mode, the transmit / receive switch switches the signal path to the transmit link. The RF signal is output from the DAC, undergoes frequency conversion by the mixer, enters the transmit link for power amplification and filtering, and is finally output through the circulator and antenna.

[0023] like Figure 2 As shown, in receive mode, the transmit / receive switch switches the signal path to the receive link. The RF signal is input from the antenna, passes through a circulator and filter, and then enters the receive link for low-noise amplification and gain control. Subsequently, it undergoes frequency conversion through a mixer and is finally output to the ADC.

[0024] The multiplexed link comprises a low-noise amplifier, an automatic gain controller, a first amplifier, a digitally controlled attenuator, and a second amplifier connected in sequence. The low-noise amplifier is connected to the transmit link and the circulator via a third transmit / receive switch, and the second amplifier is connected to the receive link and the circulator via a fourth transmit / receive switch. By rationally designing the multiplexed link, signal isolation and link performance are ensured, and signal interference problems that may arise from the multiplexing design are avoided.

[0025] like Figure 3 As shown, the input of the mixer is also connected to the first local oscillator filter, and the input of the first local oscillator filter is connected to the output of the local oscillator module.

[0026] The local oscillator module includes a third amplifier, a second local oscillator filter, a ping-pong switch, local oscillator source 1, local oscillator source 2, a power divider, a fourth amplifier, and a high-precision crystal oscillator. The output of the high-precision crystal oscillator is connected to the input of the fourth amplifier, the output of the fourth amplifier is connected to the input of the power divider, the output of the power divider is connected to the inputs of local oscillator source 1 and local oscillator source 2, local oscillator source 1 and local oscillator source 2 are connected to the ping-pong switch, the ping-pong switch is connected to the second local oscillator filter, the second local oscillator filter is connected to the third amplifier, and the third amplifier is connected to the first local oscillator filter.

[0027] By adding a ping-pong switching switch to the local oscillator module in the first local oscillator filter, high-speed frequency hopping can be achieved, which is suitable for communication scenarios that require rapid frequency switching.

[0028] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the form disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and improvements, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A transceiver multiplexed radio frequency TDD front-end circuit, characterized in that: It includes a transmit / receive switching module, a mixer module, a receive link, a transmit link, a multiplexing link, and a circulator; The transmit link is connected to the mixer module and the multiplexing link through the transmit / receive switching module. The multiplexing link is connected to the circulator and the receive link through the transmit / receive switching module. The circulator is connected to the antenna through a filter. The mixer module is connected to the DAC and ADC through the transmit / receive switching module. The receive link is connected to the mixer module and the multiplexing link through the transmit / receive switching module.

2. The radio frequency TDD front-end circuit for transceiver multiplexing according to claim 1, characterized in that: The transmit / receive switching module includes a first transmit / receive switching switch, a second transmit / receive switching switch, a third transmit / receive switching switch, and a fourth transmit / receive switching switch; The first transceiver switch is connected to the mixer module and the ADC and DAC respectively; the second transceiver switch is connected to the mixer module and the transmit link and the receive link respectively; the third transceiver switch is connected to the multiplexing link and the transmit link and the receive link respectively; and the fourth transceiver switch is connected to the multiplexing link, the receive link and the circulator respectively.

3. The radio frequency TDD front-end circuit for transceiver multiplexing according to claim 2, characterized in that: The mixer module includes an intermediate frequency filter, a mixer, and an RF filter connected in sequence; the intermediate frequency filter is connected to the ADC and DAC through a first transmit / receive switch, and the RF filter is connected to the transmit link and the receive link through a second transmit / receive switch.

4. The radio frequency TDD front-end circuit for transceiver multiplexing according to claim 2, characterized in that: The multiplexed link includes a low-noise amplifier, an automatic gain controller, a first amplifier, a digitally controlled attenuator, and a second amplifier connected in sequence; the low-noise amplifier is connected to the transmit link and the circulator via a third transmit / receive switch, and the second amplifier is connected to the receive link and the circulator via a fourth transmit / receive switch.

5. The radio frequency TDD front-end circuit for transceiver multiplexing according to claim 3, characterized in that: The input of the mixer is also connected to a first local oscillator filter, and the input of the first local oscillator filter is connected to the output of the local oscillator module.

6. The radio frequency TDD front-end circuit for transceiver multiplexing according to claim 5, characterized in that: The local oscillator module includes a third amplifier, a second local oscillator filter, a ping-pong switch, local oscillator source 1, local oscillator source 2, a power divider, a fourth amplifier, and a high-precision crystal oscillator. The output terminal of the high-precision crystal oscillator is connected to the input terminal of the fourth amplifier, the output terminal of the fourth amplifier is connected to the input terminal of the power divider, the output terminal of the power divider is connected to the input terminals of local oscillator source 1 and local oscillator source 2, local oscillator source 1 and local oscillator source 2 are connected to the ping-pong switch, the ping-pong switch is connected to the second local oscillator filter, the second local oscillator filter is connected to the third amplifier, and the third amplifier is connected to the first local oscillator filter.

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