Ultra-wideband radio frequency front-end circuit and radio frequency front-end device

Abstract

The utility model relates to the technical field of communication, in particular to an ultra-wideband radio frequency front-end circuit and a radio frequency front-end device, which comprise a receiving path, a transmitting path and a wideband power combiner, the input end of the transmitting path is connected with the output end of a transmitter, and the output end of the transmitting path is connected with the input end of the wideband power combiner. The output end of the broadband power combiner is connected with the input end of the receiving channel, the antenna end of the broadband power combiner is connected to the antenna, and the output end of the receiving channel is connected with the input end of the receiver; the transmitting path comprises a transmitting filter group and a first broadband PIN switch which are connected in sequence, and the receiving path comprises a receiving filter group and a second broadband PIN switch which are connected in sequence. According to the utility model, switching between the FDD working mode and the TDD working mode is realized under the condition that the structure is simplified, and the overall power consumption of the circuit is reduced; in addition, the receiving filter group and the transmitting filter group are used for filtering out-of-band spurious signals except the working frequency in the access, and the radio frequency front-end circuit can support a wider working frequency band.

Description

Technical Field

[0001] The utility model relates to the technical field of communications, and in particular to an ultra-wideband radio frequency front-end circuit and a radio frequency front-end device. Background Art

[0002] With the rapid development of radio frequency communication technology, the frequency of radio frequency communication is getting higher and higher, the frequency band is getting wider and wider, and the working mode is becoming more diversified.

[0003] TDD (Time Division Duplex) and FDD (Frequency Division Duplex) are the two mainstream communication duplex modes. TDD is for receiving / transmitting at different times, so there is no interference of transmission on reception, but the communication rate is halved; FDD is for receiving / transmitting at the same time but at different frequencies, so the transmission rate is doubled, which can increase the network throughput or reduce the difficulty of networking. Dual antennas / dual channels can resist fading, improve communication quality, and increase communication reliability.

[0004] The Chinese utility model patent with publication number CN207099068U discloses a TDD, FDD dual-channel multi-mode transceiver, and specifically adopts a baseband processor to select a suitable antenna and receiving path according to the quality of the received signal. The terminal antenna is connected to the switch filter group through the first selection switch, the switch filter group is connected to the input end of the first receiving path, and the first receiving path is connected to the baseband processor. The baseband realizes the TDD working mode or the FDD working mode by controlling the selection of the first selection switch, the second selection switch, the third selection switch, the fourth selection switch, and the fifth selection switch, as well as the sensing signal of the attitude sensor. This scheme has the following defects: complex structure, high device cost and power consumption. Utility Model Content

[0005] The utility model aims to provide an ultra-wideband radio frequency front-end circuit and a radio frequency front-end device to address the defects of the above-mentioned solutions in the prior art, such as complex structure, high device cost and high power consumption.

[0006] The embodiment of the utility model is implemented by the following technical scheme: an ultra-wideband radio frequency front-end circuit, comprising: a receiving path, a transmitting path and a broadband power combiner, wherein the input end of the transmitting path is connected to the output end of the transmitter, the output end of the transmitting path is connected to the input end of the broadband power combiner, the output end of the broadband power combiner is connected to the input end of the receiving path, the antenna end of the broadband power combiner is connected to the antenna, and the output end of the receiving path is connected to the input end of the receiver;

[0007] The transmission path includes a transmission filter group and a first broadband PIN switch connected in sequence, the input end of the transmission filter group is connected to the output end of the transmitter, the output end of the first broadband PIN switch is connected to the input end of the broadband combiner, and the first broadband PIN switch is configured to control the on-off of the transmission path;

[0008] The receiving path includes a receiving filter group and a second broadband PIN switch connected in sequence, the first output end of the broadband combiner is connected to the input end of the second broadband PIN switch, the output end of the receiving filter group is connected to the input end of the receiver, the second broadband PIN switch is configured to control the on-off of the receiving path, and the transmitting filter group and the receiving filter group are configured to filter out-of-band spurious signals outside the operating frequency in the corresponding path.

[0009] According to a preferred embodiment, the receiving path is provided with a first broadband coupler in series between the output end of the receiving filter group and the input end of the receiver, the first output end of the first broadband coupler is connected to the output end of the receiver, the second output end of the first broadband coupler is connected to the input end of the receiving detection circuit, the output end of the receiving detection circuit is connected to the monitoring terminal, and the receiving detection circuit is configured to monitor the working level value of the receiving path.

[0010] According to a preferred embodiment, the receiving path is provided with a digitally controlled attenuator in series between the output end of the receiving filter group and the input end of the receiver.

[0011] According to a preferred embodiment, the receiving path is provided with a low noise amplifier in series between the output end of the receiving filter group and the input end of the receiver.

[0012] According to a preferred embodiment, the receiving path is further provided with a first load resistor, and the first load resistor is connected to a second broadband PIN switch.

[0013] According to a preferred implementation manner, the resistance of the first load resistor is 50 ohms.

[0014] According to a preferred embodiment, the transmission path is provided with a second broadband coupler in series between the output end of the transmission filter group and the input end of the transmission PIN switch, the first output end of the second broadband coupler is connected to the input end of the first broadband PIN switch, the second output end of the second broadband coupler is connected to the input end of the transmission detection circuit, the output end of the transmission detection circuit is connected to the monitoring terminal, and the transmission detection circuit is configured to monitor the operating level value of the transmission path.

[0015] According to a preferred embodiment, the transmitting path is further provided with a second load resistor, and the second load resistor is connected to the first broadband PIN switch.

[0016] According to a preferred implementation manner, the resistance of the second load resistor is 50 ohms.

[0017] The utility model also provides a radio frequency front-end device, comprising the ultra-wideband radio frequency front-end circuit as described above, wherein the number of broadband combiners, transmitting paths and receiving paths is N, N is a positive integer greater than or equal to 1, and the N broadband combiners are correspondingly connected to the N transmitting paths and the N receiving paths;

[0018] It also includes a combiner, the input end of the combiner is connected to the output ends of N broadband power combiners, and the output end of the combiner is connected to the antenna.

[0019] The technical solution of an ultra-wideband radio frequency front-end circuit and a radio frequency front-end device in the embodiment of the utility model has at least the following advantages and beneficial effects: the radio frequency front-end circuit includes a receiving path, a transmitting path and a broadband combiner, the transmitting path includes a transmitting filter group and a first broadband PIN switch connected in sequence, and the receiving path includes a receiving filter group and a second broadband PIN switch connected in sequence, and based on the gating of the first broadband PIN switch and the second broadband PIN switch, a TDD working mode or a FDD working mode is realized. During use, for the transmitting path, the broadband PIN switch of the transmitting path is quickly switched to the on state, and the broadband PIN switch of the receiving path is quickly switched to the off state, and the transmitting frequency signal sent by the transmitter passes through the transmitting filter group and is output after filtering; for the receiving path, the broadband PIN switch of the receiving path is quickly switched to the on state, and the channel level filtering sent by the broadband combiner is sent to the receiver, and the switching of the FDD and TDD working modes is realized under the condition of simplified structure, and the circuit reduces the overall power consumption; in addition, the receiving filter group and the transmitting filter group are used to filter out the out-of-band spurious signals other than the working frequency in the path, and the radio frequency front-end circuit can support a wider working frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the principle of an ultra-wideband radio frequency front-end circuit provided in Example 1 of the utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Example 1

[0023] Figure 1The present invention is a schematic diagram of an ultra-wideband radio frequency front-end circuit that supports TDD and FDD working modes.

[0024] Specifically, the ultra-wideband RF front-end circuit supporting TDD and FDD working modes includes: a receiving path, a transmitting path and a broadband combiner, wherein the input end of the transmitting path is connected to the output end of the transmitter, and the output end of the transmitting path is connected to the input end of the broadband combiner; the broadband combiner is used to receive the transmission signal of the transmitting path and transmit it through the antenna;

[0025] The output end of the broadband combiner is connected to the input end of the receiving path, the antenna end of the broadband combiner is connected to the antenna, and the output end of the receiving path is connected to the input end of the receiver. In this embodiment, the broadband combiner is used as a common path of the transmitting and receiving paths, and is also used to transmit the received signal to the receiving path through its antenna end. Normally, the transmitting path and the receiving path work at the same time, and the broadband combiner transmits both the transmitting signal output by the transmitting path and the receiving signal received by the receiving path. Considering that the above situation may cause noise of the transmitting signal in the receiving signal, this embodiment adopts a broadband combiner device with a large isolation between the transmitting path and the receiving path.

[0026] Furthermore, in one implementation of the present embodiment, the transmission path includes a transmission filter group and a first broadband PIN switch connected in sequence, the input end of the transmission filter group is connected to the output end of the transmitter, and is used to receive the transmission signal from the transmitter and perform filtering processing; the output end of the first broadband PIN switch is connected to the input end of the broadband combiner, and the first broadband PIN switch is configured to control the on-off of the transmission path. When the transmission path is connected, the filtered transmission signal is transmitted to the broadband combiner via the first broadband PIN switch, and is transmitted from the antenna through the antenna end of the broadband combiner.

[0027] Furthermore, in one implementation of the present embodiment, the receiving path includes a receiving filter group and a second broadband PIN switch connected in sequence, the first output end of the broadband combiner is connected to the input end of the second broadband PIN switch, the output end of the receiving filter group is connected to the input end of the receiver, and the second broadband PIN switch is configured to control the on-off of the receiving path. When the receiving path is connected, the signal transmitted by the antenna is transmitted to the receiving filter group through the second broadband PIN switch, the receiving signal is filtered by the receiving filter group, and the filtered signal is transmitted to the receiver.

[0028] It should be noted that, in this embodiment, the receiving filter group and the transmitting filter group are used to filter out out-band spurious signals other than the operating frequency in the path, especially in the FDD working mode, to further isolate the influence of the receiving and transmitting signals, and further ensure that the receiving and transmitting paths do not affect each other.

[0029] To sum up, the solution provided in this embodiment realizes the switching of FDD and TDD working modes with a simplified structure, and the circuit reduces the overall power consumption; in addition, the receiving filter group and the transmitting filter group are used to filter out the out-of-band spurious signals other than the working frequency in the path, and support a wider working frequency band (covering WIFI, GPS and 2G, 3G, 4G, 5G and other cellular mobile communication frequency bands).

[0030] Example 2

[0031] This embodiment further improves the receiving path based on Embodiment 1, and the specific improvements are as follows:

[0032] The receiving path is provided with a first broadband coupler in series between the output end of the receiving filter group and the input end of the receiver, and the first output end of the first broadband coupler is connected to the output end of the receiver. Furthermore, a path is separated from the receiving path through the first broadband coupler, and the second output end of the first broadband coupler is connected to the input end of the receiving detection circuit, and the output end of the receiving detection circuit is connected to the monitoring terminal.

[0033] It should be noted that the receiving detection circuit is configured to monitor the working level value of the receiving path and send the working level value of the receiving path to the monitoring terminal for further monitoring / control.

[0034] Furthermore, in order to adjust the input electrical signal strength and obtain the required output signal strength, the receiving path of this embodiment is provided with a digitally controlled attenuator and a low noise amplifier in series between the output of the receiving filter group and the input of the receiver; specifically, the input of the digitally controlled attenuator is connected to the first output of the first broadband coupler, the output of the digitally controlled attenuator is connected to the input of the low noise amplifier, and the output of the low noise amplifier is connected to the input of the receiver, so as to keep the low noise amplifier away from the broadband power divider and increase the isolation between the transmission path and the receiving path. This embodiment attenuates the signal noise transmitted through the receiving filter group by the digitally controlled attenuator to ensure that the entire receiving path is in a linear working state; further, the signal adjusted by the digitally controlled attenuator is amplified by the low noise amplifier to improve the signal-to-noise ratio of the output of the receiving path.

[0035] Furthermore, the receiving path is also provided with a first load resistor, the first load resistor is connected to the second broadband PIN switch, and the on and off of the first load resistor is controlled by the second broadband PIN switch in different working modes; this embodiment sets the first load resistor in the receiving path to ensure that the broadband combiner works in a matching state, so that the input level of the receiving path is not affected by the working mode. Specifically, in one implementation of this embodiment, the resistance value of the first load resistor is 50 ohms.

[0036] Example 3

[0037] This embodiment further improves the transmission path based on Embodiment 1 and Embodiment 2. The specific improvements are as follows:

[0038] The transmission path is provided with a second broadband coupler in series between the output end of the transmission filter group and the input end of the transmission PIN switch, and the first output end of the second broadband coupler is connected to the input end of the second broadband PIN switch; further, a path is branched from the transmission path through the second broadband coupler, and the second output end of the second broadband coupler is connected to the input end of the transmission detection circuit, and the output end of the transmission detection circuit is connected to the monitoring terminal.

[0039] It should be noted that the transmission detection circuit is configured to monitor the transmission path working level value and send the transmission path working level value to the monitoring terminal for further monitoring / control.

[0040] Furthermore, the transmission path is also provided with a second load resistor, which is connected to the first broadband PIN switch. In different working modes, the on and off of the second load resistor is controlled by the first broadband PIN switch. In this embodiment, the second load resistor is provided in the transmission path to ensure that the broadband combiner works in a matching state, so that the output level of the transmission path is not affected by the working mode. Specifically, in one implementation of this embodiment, the resistance value of the second load resistor is 50 ohms.

[0041] Example 4

[0042] This embodiment provides a solution of combining the ultra-wideband RF front-end circuits provided in Embodiments 1 to 3 to form a multi-channel RF front-end device to meet the application scenarios requiring multiple channels. Specifically, in this embodiment, the number of broadband power combiners, transmission paths, and receiving paths is N, where N is a positive integer greater than or equal to 1, and the N broadband power combiners are correspondingly connected to the N transmission paths and the N receiving paths; and also includes a combiner, the input end of the combiner is connected to the output ends of the N broadband power combiners, and the output end of the combiner is connected to the antenna.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ultra-wideband radio frequency front-end circuit, characterized in that: include: A receiving path, a transmitting path and a broadband combiner, wherein the input end of the transmitting path is connected to the output end of the transmitter, the output end of the transmitting path is connected to the input end of the broadband combiner, the output end of the broadband combiner is connected to the input end of the receiving path, the antenna end of the broadband combiner is connected to the antenna, and the output end of the receiving path is connected to the input end of the receiver; The transmission path includes a transmission filter group and a first broadband PIN switch connected in sequence, the input end of the transmission filter group is connected to the output end of the transmitter, the output end of the first broadband PIN switch is connected to the input end of the broadband combiner, and the first broadband PIN switch is configured to control the on-off of the transmission path; The receiving path includes a receiving filter group and a second broadband PIN switch connected in sequence, the first output end of the broadband combiner is connected to the input end of the second broadband PIN switch, the output end of the receiving filter group is connected to the input end of the receiver, the second broadband PIN switch is configured to control the on-off of the receiving path, and the transmitting filter group and the receiving filter group are configured to filter out-of-band spurious signals outside the operating frequency in the corresponding path.

2. The ultra-wideband radio frequency front-end circuit according to claim 1, characterized in that: The receiving path is provided with a first broadband coupler in series between the output end of the receiving filter group and the input end of the receiver, the first output end of the first broadband coupler is connected to the output end of the receiver, the second output end of the first broadband coupler is connected to the input end of the receiving detection circuit, the output end of the receiving detection circuit is connected to the monitoring terminal, and the receiving detection circuit is configured to monitor the working level value of the receiving path.

3. The ultra-wideband radio frequency front-end circuit according to claim 1, characterized in that: The receiving path is provided with a digitally controlled attenuator in series between the output end of the receiving filter group and the input end of the receiver.

4. The ultra-wideband radio frequency front-end circuit according to claim 1, characterized in that: The receiving path is provided with a low noise amplifier in series between the output end of the receiving filter group and the input end of the receiver.

5. The ultra-wideband radio frequency front-end circuit according to claim 1, characterized in that: The receiving path is further provided with a first load resistor, and the first load resistor is connected to a second broadband PIN switch.

6. The ultra-wideband radio frequency front-end circuit according to claim 5, characterized in that: The resistance of the first load resistor is 50 ohms.

7. The ultra-wideband radio frequency front-end circuit according to any one of claims 1 to 6, characterized in that: The transmission path is provided with a second broadband coupler in series between the output end of the transmission filter group and the input end of the transmission PIN switch, the first output end of the second broadband coupler is connected to the input end of the first broadband PIN switch, the second output end of the second broadband coupler is connected to the input end of the transmission detection circuit, the output end of the transmission detection circuit is connected to the monitoring terminal, and the transmission detection circuit is configured to monitor the working level value of the transmission path.

8. The ultra-wideband radio frequency front-end circuit according to claim 7, characterized in that: The transmitting path is further provided with a second load resistor, and the second load resistor is connected to the first broadband PIN switch.

9. The ultra-wideband radio frequency front-end circuit according to claim 8, characterized in that: The resistance of the second load resistor is 50 ohms.

10. A radio frequency front-end device, comprising the ultra-wideband radio frequency front-end circuit according to any one of claims 1 to 9, characterized in that: The number of broadband power combiners, transmitting paths and receiving paths is N, where N is a positive integer greater than or equal to 1, and the N broadband power combiners are correspondingly connected to the N transmitting paths and the N receiving paths; It also includes a combiner, the input end of the combiner is connected to the output ends of N broadband power combiners, and the output end of the combiner is connected to the antenna.

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