Diversity circuit and radio frequency device

Abstract

The invention provides a diversity circuit and a radio frequency device, the diversity circuit comprises a radio frequency switch, a DRX filter, a Dip device and a radio frequency transceiver, after a radio frequency signal is input to the radio frequency switch and the Dip device through a diversity antenna, the radio frequency signal is switched into a plurality of radio frequency bands, and after the diversity filter filters the radio frequency signal in a corresponding frequency range, the radio frequency band is switched into a plurality of radio frequency bands. A radio frequency switch is used for filtering radio frequency signals, the filtered radio frequency signals are input into a radio frequency transceiver for signal processing, so that different CA combination requirements are met, signal paths can be flexibly switched according to different CA combination requirements by using the radio frequency switch, extra loss caused by using a DiFEM is avoided, PCB wiring is simplified, and line loss is reduced; compared with a DiFEM built-in filter, the DRX filter has lower loss and better single-frequency-band performance, each diversity filter is independently connected with one receiving port of the radio frequency transceiver, frequency bands with poor performance can be independently optimized, and diversity sensitivity is further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated circuits, and in particular relates to a diversity circuit and a radio frequency device. Background Art

[0002] With the rapid development of mobile communications, mobile phones, tablets, watches and various smart terminals have higher requirements for speed, especially with the widespread application of 4G (the 4th Generation mobile communication technology) and 5G (the 5th Generation Mobile Communication Technology), 4G and 5G mobile terminals have higher requirements for receiving signals, and there are more and more frequency bands. The use of technologies such as CA (Carrier Aggregation) has enabled mobile terminals to have higher downlink rates, stronger signals and better transmission experience, but at the same time, the main and diversity RF architecture of 4G / 5G mobile terminals has become more and more complex, which has brought greater challenges to the design of the main and diversity RF front-end.

[0003] Under the premise of the same RF frequency band and standard, the diversity circuits of 4G and 5G mobile terminals with downlink inter-band CA function are generally composed of DiFEM (integrated single-pole multi-throw switch and filter), LNA (Low Noise Amplifier), DRX filter (Diversity filter) and Dip (Diplexer). Among them, downlink inter-band CA refers to inter-band downlink CA between different frequency bands.

[0004] Please refer to Figure 1 , Figure 1 The schematic diagram of the architecture of a conventional diversity circuit with LB (low frequency) + MB (intermediate frequency), LB + HB (high frequency), MB + HB, MB + MB downlink CA functions in the prior art is shown, wherein the dual-port DiFEM inner throw switch realizes the downlink CA combination function requirements of diversity LB + MB, LB + HB, MB + HB and MB + MB through the dual-port DiFEM and Dip. However, in the above structure, DiFEM will bring higher insertion loss, especially at high and low frequencies, such as

[0005] For Band12 / 13 / 17 / 20 / 28 and Band7 / 38 / 40 / 41 (Band here stands for frequency band), the line loss increases by about 0.5dB or more, and the DiFEM module port design is not flexible. Most frequency bands require drilling for PCB routing, which will increase line loss and further reduce the diversity reception sensitivity performance. At the same time, the use of DiFEM modules will make the internal DRX filter line loss larger, and there is a lack of effective alternatives when the single-band performance is insufficient. In order to improve the frequency bands with insufficient diversity performance, an additional external low-noise amplifier (LNA) is required, which increases the overall design cost of the diversity RF architecture and the PCB ornament area.

[0006] Please refer to Figure 2 , Figure 2 The figure shows a conventional diversity circuit architecture without LB+MB, LB+HB, MB+HB and MB+MB downlink CA functions. The architecture is equipped with a DiFEM module, but because the DiFEM module is designed for multiple frequency bands, some countries or regions may not need to use all the frequency bands supported by the DiFEM module, which results in some unnecessary frequency bands when using the DiFEM module in these regions, thereby increasing the material cost of the product. In addition, the price of the DiFEM module in the current market is relatively high, which makes the cost performance of the equipment that supports downlink inter-band carrier aggregation and is equipped with the DiFEM module not ideal. Summary of the invention

[0007] The present invention provides a diversity circuit and a radio frequency device, which can reduce circuit line loss and improve diversity receiving sensitivity.

[0008] The present invention provides a diversity circuit, comprising: a first single-pole multi-throw switch, a second single-pole multi-throw switch, a first combiner, a plurality of diversity filters, a diversity antenna and a radio frequency transceiver;

[0009] After receiving the radio frequency signal, the diversity antenna inputs the radio frequency signal into the first combiner, and the first combiner performs frequency division processing on the radio frequency signal to obtain a first frequency division signal and a second frequency division signal, and inputs the first frequency division signal and the second frequency division signal into the first single-pole multi-throw switch and the second single-pole multi-throw switch respectively; wherein the first frequency division signal and the second frequency division signal are signals of different frequency bands;

[0010] The first single-pole multi-throw switch and the second single-pole multi-throw switch respectively switch the first frequency-divided signal and the second frequency-divided signal to the diversity filter;

[0011] After the diversity filter filters the radio frequency signal in the corresponding frequency range, the filtered radio frequency signal is input into the radio frequency transceiver for signal processing.

[0012] Furthermore, the first combiner includes a low-frequency low-pass filter and a medium- and high-frequency high-pass filter;

[0013] Furthermore, the low-frequency low-pass filter allows frequencies to pass in a range of 698 MHz to 960 MHz, and the medium- and high-frequency high-pass filter allows frequencies to pass in a range of 1710 MHz to 2700 MHz.

[0014] Furthermore, it also includes a second combiner;

[0015] The input end of the second combiner is connected to the output end of the first combiner, and the output end of the second combiner is connected to the input end of the second single-pole multi-throw switch.

[0016] Furthermore, the second combiner includes a medium-low frequency low-pass filter and a high-frequency high-pass filter.

[0017] Furthermore, the medium-low frequency low-pass filter allows frequencies to pass in a range of 698 MHz to 2200 MHz, and the high-frequency high-pass filter allows frequencies to pass in a range of 2300 MHz to 2700 MHz.

[0018] Furthermore, it also includes an antenna switching switch; the antenna switching switch is connected between the first combiner and the diversity antenna.

[0019] Furthermore, the antenna switching switch includes a double-pole double-throw switch or a triple-pole triple-throw switch.

[0020] Furthermore, it also includes a third single-pole multi-throw switch; the input end of the third single-pole multi-throw switch is connected to the output end of the first single-pole multi-throw switch, and the output end of the third single-pole multi-throw switch is connected to the diversity filter.

[0021] Furthermore, a double saw filter is also included;

[0022] The input end of the dual saw filter is connected to the output end of the first single-pole multi-throw switch, and the output end is connected to the radio frequency transceiver.

[0023] The present invention also discloses a diversity circuit, comprising: a first single-pole multi-throw switch, a plurality of diversity filters, a diversity antenna and a radio frequency transceiver;

[0024] After receiving the RF signal, the diversity antenna inputs the RF signal into the first single-pole multi-throw switch. The first single-pole multi-throw switch switches the RF signal to the plurality of diversity filters. After filtering the RF signal in the corresponding frequency range, the diversity filter inputs the filtered RF signal into the RF transceiver for signal processing.

[0025] The present invention also provides a radio frequency device, comprising the above-mentioned diversity circuit.

[0026] Compared with the prior art, the present invention has at least the following technical effects:

[0027] The diversity circuit disclosed in the present invention includes a single-pole multi-throw switch, a diversity filter, a Dip device and a radio frequency transceiver. After the radio frequency signal is input to the single-pole multi-throw switch and the Dip device through the diversity antenna, it is switched to multiple radio frequency bands. After the diversity filter filters the radio frequency signal of the corresponding frequency band, the filtered radio frequency signal is input into the radio frequency transceiver for signal processing, thereby realizing different CA combination requirements. By using a single-pole multi-throw switch, the signal path can be flexibly switched according to different CA combination requirements, avoiding the additional loss caused by the use of DiFEM, simplifying PCB wiring, and reducing line loss. In addition, compared with the built-in filter of DiFEM, the diversity filter has lower loss and better single-band performance. Each diversity filter can be flexibly connected to any receiving port of the radio frequency transceiver, and can be optimized separately for the frequency band with poor performance, further improving the diversity sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the architecture of a diversity circuit with a downlink CA function in the prior art;

[0029] Figure 2 It is a schematic diagram of the architecture of a diversity circuit without a downlink CA function in the prior art;

[0030] Figure 3 Schematic diagram of the architecture of a diversity circuit with a downlink CA function in Embodiment 1 of the present invention;

[0031] Figure 4 This is a comparison diagram of the effects of the diversity circuit with downlink CA function in the first embodiment of the present invention and the prior art;

[0032] Figure 5 Schematic diagram of the architecture of another diversity circuit with downlink CA function in Embodiment 1 of the present invention;

[0033] Figure 6 This is a comparison diagram of the effects of another diversity circuit with downlink CA function in Embodiment 1 of the present invention and the prior art;

[0034] Figure 7 It is a schematic diagram of the architecture of a diversity circuit without a downlink CA function in Embodiment 2 of the present invention;

[0035] Figure 8 This is a comparison diagram of the effects of the diversity circuit without downlink CA function in the second embodiment of the present invention and the prior art. DETAILED DESCRIPTION

[0036] The following is a description of a diversity circuit and a radio frequency device of the present invention in conjunction with a schematic diagram, wherein a preferred embodiment of the present invention is shown. It should be understood that those skilled in the art can modify the present invention described herein and still achieve the advantageous effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art and not as a limitation of the present invention.

[0037] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in illustrating the purpose of the embodiments of the present invention.

[0038] Embodiment 1

[0039] This embodiment provides a diversity circuit. Please refer to Figure 3 , including: a first single-pole multi-throw switch 1, a second single-pole multi-throw switch 2, a first combiner Dip1, multiple diversity filters, a diversity antenna DRX ANT and a radio frequency transceiver.

[0040] After receiving the RF signal, the diversity antenna inputs the RF signal into the first combiner Dip1, and the first combiner Dip1 performs frequency division processing on the RF signal to obtain a first frequency division signal and a second frequency division signal, and inputs the first frequency division signal and the second frequency division signal into the first single-pole multi-throw switch 1 and the second single-pole multi-throw switch 2 respectively.

[0041] The first single-pole multi-throw switch 1 and the second single-pole multi-throw switch 2 respectively switch the first frequency-divided signal and the second frequency-divided signal to the diversity filter;

[0042] The multiple input ends of the RF transceiver are respectively connected to multiple diversity filters; after the diversity filters filter the RF signals in the corresponding frequency range, the filtered RF signals are input into the RF transceiver for signal processing.

[0043] The diversity circuit disclosed in this embodiment is applicable to various intelligent terminal devices, including mobile phones, tablets, and smart watches.

[0044] For specific connection relationships between devices, please refer to Figure 3 One end of the diversity antenna is connected to one end of the first combiner Dip1, one of the medium and high frequency high pass filters in the first combiner Dip1 is connected to the common end of the second single-pole multi-throw switch 2, and the other low frequency low pass filter is connected to the common end of the first single-pole multi-throw switch 1, and the output ends of the first single-pole multi-throw switch 1 and the second single-pole multi-throw switch 2 are respectively connected to the corresponding diversity filters.

[0045] By using the first single-pole multi-throw switch 1 and the second single-pole multi-throw switch 2, the above-mentioned diversity circuit can flexibly switch the signal path according to different CA combination requirements, avoid the additional loss caused by using DiFEM, simplify PCB wiring, and reduce line loss. Compared with the use of conventional DiFEM solutions, the combination of RF switches, DRX filters and Dip devices can avoid redundant (frequency band) design and reduce costs.

[0046] In addition, compared with the DiFEM built-in filter, the DRX filter has lower loss and better single-band performance. Each DRX filter can be flexibly connected to any receiving port of the RF transceiver, and can be individually optimized for frequency bands with poor performance to further improve diversity sensitivity.

[0047] In a specific embodiment, the signals that the diversity antenna can receive include but are not limited to LB (low frequency), MB (medium frequency) and HB (high frequency) signals, which can be 4G frequency band signals or 5G frequency band signals. The frequency range of LB includes: 0.6GHz ~ 1GHz, and the frequency bands within this frequency range include but are not limited to: Band5 / B6 / B8 / B12 / B13 / B17 / B18 / B19 / B20 / B26 / B28 / B71;

[0048] The frequency range of MB is: 1GHz~2.2GHz, and the frequency bands within this frequency range include but are not limited to: Band1 / B2 / B3 / B4 / B25 / B66 / B34 / B39 and n1 / n2 / n3 / n25 / n66 / n34 / n39; the frequency range of HB is: 2.3GHz~2.7GHz, and the frequency bands within this frequency range include but are not limited to: Band7 / B38 / B40 / B41 and n7 / n38 / n40 / n41.

[0049] In another specific embodiment, the RF signals that can be received by the diversity antenna disclosed in this embodiment include: LB, MB and HB signals, and the corresponding selectable diversity filters include a low-frequency diversity filter, a medium-frequency diversity filter and a high-frequency diversity filter. Each diversity filter is connected to a receiving port of the RF transceiver and is used to filter out out-band interference signals of RF signals in different frequency bands.

[0050] In another specific embodiment, different frequency bands with the same frequency range can be filtered by the same DRX filter, such as B38 (2570MHz~2619.9MHz) / B41 (2496MHz~2689.9MHz) can be filtered by the same high frequency (2496MHz~2689.9MHz) diversity filter, and B12 (729MHz~745.9MHz) / B13 (746MHz~755.9MHz) / B17 (734MHz~745.9MHz) can be filtered by the same low frequency (729MHz~746MHz) diversity filter. The number of diversity filters is not specifically limited here, and can be selected according to the different frequency band requirements of different projects.

[0051] Further, in this embodiment, the number of input terminals of the first single-pole multi-throw switch 1 and the second single-pole multi-throw switch 2 can be selected according to the number of actually received radio frequency bands.

[0052] In a specific embodiment, the first single-pole multi-throw switch 1 may be a single-pole ten-throw switch, with the input terminal 10, and the second single-pole multi-throw switch 2 may be a single-pole four-throw switch, with the input terminal 4.

[0053] Furthermore, in this embodiment, the frequency range of the radio frequency signal that can be passed by the first combiner Dip1 can be selected according to the CA combination that needs to be implemented.

[0054] In a specific embodiment, the first combiner Dip1 includes a low-frequency low-pass filter and a medium-high frequency high-pass filter. In the first combiner Dip1, the low-frequency low-pass filter allows frequencies to pass in the range of 698MHz to 960MHz, and the medium-high frequency high-pass filter allows frequencies to pass in the range of 1710MHz to 2700MHz.

[0055] When the first combiner Dip1 including a low-frequency low-pass filter and a medium-high frequency high-pass filter is used, the radio frequency signal enters the common end of the first combiner Dip1 through the diversity antenna, and is divided into a low-frequency band signal and a medium-high frequency band signal after passing through the first combiner Dip1. The two downlink carrier aggregation frequency bands enter the first single-pole multi-throw switch 1 and the second single-pole multi-throw switch 2 respectively. The first single-pole multi-throw switch 1 can pass the low-frequency band signal, and after being switched into a plurality of different low-frequency band signals by the first single-pole multi-throw switch 1, the plurality of different low-frequency band signals are input one by one into a plurality of low-frequency diversity filters for filtering; the second single-pole multi-throw switch 2 can be set to pass the medium-high frequency band signal, and the medium-high frequency signal is switched into a plurality of different medium-frequency signals and high-frequency signals by the second single-pole multi-throw switch 2, and then respectively input into the corresponding diversity filters. The diversity filter inputs the filtered radio frequency signal into the radio frequency transceiver to modulate and demodulate the signal, thereby realizing the downlink CA combination function of diversity LB+MB and LB+HB.

[0056] Furthermore, in this embodiment, at least one double saw (Surface Acoustic Wave) filter 5 is provided between the RF transceiver and the first SPMT switch 1, the input end of the double saw filter 5 is connected to the output end of the first SPMT switch, and the output end is connected to the RF transceiver. The double saw filter 5 includes two filters, and the two filters are combined in the same package, and can filter signals of different frequencies in the same frequency band at the same time. In this embodiment, two RF signals of different frequencies in the intermediate frequency signal are filtered by adding the double saw filter 5, and the two RF signals are simultaneously input into the RF transceiver, so as to realize the downlink CA combination of MB+MB.

[0057] Specifically, the downlink CA combinations of the above LB+MB include but are not limited to CA_1A-20A, CA_1A-28A, CA_1A-5A, CA_1A-8A, CA_3A-20A, CA_3A-28A, CA_3A-5A and CA_3A-8A; the downlink CA combinations of LB+HB include but are not limited to: CA_20A-38A, CA_20A-40A, CA_20A-41A, CA_28A-38A , CA_28A-40A, CA_28A-41A, CA_5A-40A, CA_5A-7A, CA_7A-20A, CA_7A-28A, CA_7A-8A, CA_8A-38A, CA_8A-40A and CA_8A-41A; the downlink CA combination of MB+MB includes but is not limited to CA_1A-3A, CA_3A-1A, CA_n1A-n3A and n3A-n1A, and the MB+MB 2DLCA combination can be realized by B1+B3 double saw filters.

[0058] Please refer to Figure 4 ,from Figure 4 It can be seen that compared with the conventional single-port DiFEM, DRX filter and Dip connected in the prior art, the diversity circuit solution disclosed in this embodiment is adopted. When the supported downlink CA combination frequency bands are LB+MB, LB+HB, MB+HB and MB+MB, the diversity low-frequency insertion loss (such as B20 / B28) and TDD high-frequency (such as B38 / 40 / 41) insertion loss can be reduced by about 0.8-1.2dB, the sensitivity is significantly better, and the signal is stronger. At this time, MB goes through the second RF switch 2, and the insertion loss of each frequency band except B1 or B3, other frequency bands such as B7 / B12 / B13 / B17 / B20 / B28 / B38 / B40 / B41, etc. will be reduced by about 0.3-1.2dB, and the diversity sensitivity is better.

[0059] Please refer to Figure 5 , further, in this embodiment, it also includes: a second combiner Dip2.

[0060] Specifically, the input end of the second combiner Dip2 is connected to the output end of the first combiner Dip1 , and the output end of the second combiner Dip2 is connected to the input end of the second single-pole multi-throw switch 2 .

[0061] At this time, one end of the diversity antenna is connected to one end of the first combiner Dip1, one of the medium and high frequency high pass filters in the first combiner Dip1 is connected to the input end of the second combiner Dip2, and one of the high frequency high pass filters in the second combiner Dip2 is connected to the common end of the second single-pole multi-throw switch 2; another medium and low frequency low pass filter in the second combiner Dip2 is connected to the corresponding medium frequency diversity filter, and another low frequency low pass filter of the first combiner Dip1 is connected to the common end of the first single-pole multi-throw switch 1, and different output ends of the first single-pole multi-throw switch 1 and the second single-pole multi-throw switch 2 are respectively connected to different diversity filters; different diversity filters are connected to different input ends of the RF transceiver, and the RF transceiver modulates and demodulates the signal sent by the filter. On this basis, adding the second combiner Dip2 can meet more CA combination requirements.

[0062] In a specific embodiment, the medium-low frequency low-pass filter allows the frequency range to pass is 698MHz to 2200MHz, and the high-frequency high-pass filter allows the frequency range to pass is 2300MHz to 2700MHz. The second combiner Dip2 separates the medium-high frequency signals, and inputs the medium frequency signal into the medium frequency diversity filter, and inputs the high frequency signal into the second single-pole multi-throw switch 2, and switches the high frequency signal to multiple high-frequency diversity filters through the second single-pole multi-throw switch 2, and then inputs the low frequency signal, the medium frequency signal and the high frequency signal into the RF transceiver through the diversity filter for signal modulation and demodulation, thereby realizing the downlink inter-band CA functions of LB+MB, LB+HB, and MB+HB, and realizing the downlink CA combination requirements of MB+MB through double saw.

[0063] Specifically, the downlink CA combinations of the above LB+MB include but are not limited to CA_1A-20A, CA_1A-28A, CA_1A-5A, CA_1A-8A, CA_3A-20A, CA_3A-28A, CA_3A-5A and CA_3A-8A; the downlink CA combinations of LB+HB include but are not limited to: CA_20A-38A, CA_20A-40A, CA_20A-41A, CA_28A-38A, CA_28A-40A, CA_28A-41A, CA_5A-40A A, CA_5A-7A, CA_7A-20A, CA_7A-28A, CA_7A-8A, CA_8A-38A, CA_8A-40A and CA_8A-41A; the downlink CA combinations of MB+MB include but are not limited to CA_1A-3A; the downlink CA combinations of MB+HB include but are not limited to: CA_1A-38A, CA_1A-40A, CA_1A-41A, CA_1A-7A, CA_3A-38A, CA_3A-40A, CA_3A-41A and CA_3A-7A.

[0064] It can be understood that the RF frequency bands that the above-mentioned first combiner Dip1, the second combiner Dip2, the first single-pole multi-throw switch 1 and the second single-pole multi-throw switch 2 can pass include but are not limited to the above-mentioned. The first combiner Dip1, the second combiner Dip2, the first single-pole multi-throw switch 1 and the second single-pole multi-throw switch 2 can be selected and configured to pass through different RF frequency bands according to actual communication needs and standards to support different downlink carrier aggregation frequency band combinations.

[0065] In a specific embodiment, the MHB frequency range is generally: 1710MHz ~ 2700MHz; the LMB (medium and low frequency) frequency range is generally: 698MHz ~ 2200MHz; the low frequency range is generally: 698MHz ~ 960MHz; the intermediate frequency range is generally: 1710MHz ~ 2200MHz; the high frequency range is generally: 2300MHz ~ 2700MHz.

[0066] It can be understood that the isolation between the combiners needs to be greater than a certain set threshold value, so as to achieve non-interference between the two radio frequency bands of the CA combination.

[0067] In a specific embodiment, the isolation between the low-frequency low-pass filter and the medium-high frequency high-pass filter in the first combiner Dip1 is greater than or equal to 25dB, so as to achieve mutual non-interference between the LB and MHB signal bands. The isolation between the high-frequency high-pass filter and the medium-low frequency low-pass filter in the second combiner Dip2 also needs to be greater than or equal to 25dB, so as to achieve mutual non-interference between the HB and MB signal bands.

[0068] Please refer to Figure 6 Compared with the conventional single-port DiFEM, DRX filter and Dip connected in the prior art, the diversity circuit solution disclosed in this embodiment can reduce the diversity low-frequency insertion loss of the downlink inter-band CA by about 1dB (such as B20 and B28), and the TDD (such as B38 and B41) sensitivity is also optimized by about 0.5dB when the supported CA combination frequency bands are LB+MB, LB+HB, MB+HB and MB+MB.

[0069] Furthermore, in this embodiment, it also includes: a third single-pole multi-throw switch 3.

[0070] Specifically, the input end of the third single-pole multi-throw switch 3 is connected to the output end of the first single-pole multi-throw switch 1, and any output end of the third single-pole multi-throw switch 3 is connected to the low-frequency diversity filter. The third single-pole multi-throw switch 3 is suitable for configurations with more frequency bands (generally, configurations with more low-frequency bands). When the first single-pole multi-throw switch 1 has insufficient ports, the third single-pole multi-throw switch 3 and the first single-pole multi-throw switch 1 are cascaded to achieve a diversity circuit with better cost performance.

[0071] Furthermore, in this embodiment, an antenna switching switch 4 is also included.

[0072] Specifically, the antenna switch 4 is connected between the first combiner Dip1 and the diversity antenna. The antenna switch 4 can enhance antenna performance. By using the antenna switch 4 to intelligently select the best antenna or signal path, the strength and quality of the received wireless signal can be improved, thereby improving the communication capability of the mobile phone, reducing dropped calls and providing a more stable network connection. The type of antenna switch can be selected according to the actual number of antennas.

[0073] In a specific embodiment, the antenna switching switch 4 is a double-pole double-throw switch or a triple-pole triple-throw switch.

[0074] Embodiment 2

[0075] This embodiment provides a diversity antenna without LB+MB, LB+HB, MB+HB, MB+MB downlink inter-band CA functions, and further simplifies the structure and design cost for situations where the CA function is not needed.

[0076] Furthermore, this embodiment also provides a diversity path without LB+MB, LB+HB, MB+HB, MB+MB downlink inter-band CA function, please refer to Figure 7 The diversity path includes a diversity antenna, an antenna switching switch 4, a first single-pole multi-throw switch 1, multiple diversity filters and a radio frequency transceiver.

[0077] Specifically, the diversity antenna is connected to the first single-pole multi-throw switch 1 through the antenna switching switch 4, and the first single-pole multi-throw switch 1 is connected to the radio frequency transceiver through a plurality of the diversity filters. The radio frequency signal received by the diversity antenna passes through the antenna switching switch 4 and the first single-pole multi-throw switch 1, is processed by the diversity filter, and finally reaches the radio frequency transceiver.

[0078] The types of the first single-pole multi-throw switch 1, the antenna switching switch 4, and the diversity filter disclosed in this embodiment are the same as those in the first embodiment, and the technical effects brought about are also the same as those in the first embodiment, which will not be repeated here.

[0079] Please refer to Figure 8 Compared with the first embodiment, the diversity circuit without LB+MB, LB+HB, MB+HB, MB+MB downlink inter-band CA function disclosed in this embodiment can further save two combiners and the second single-pole multi-throw switch 2, with lower insertion loss, further improved diversity sensitivity performance, and higher transmission rate. Compared with the conventional single-port DiFEM, DRX filter and Dip connected in the prior art, the high and low frequency sensitivity is improved by 0.5-1dB.

[0080] In addition, the different products with LB+MB, LB+HB, MB+HB, MB+MB downlink inter-band CA disclosed in Example 1 and the different products without LB+MB, LB+HB, MB+HB, MB+MB downlink inter-band CA disclosed in Example 1 can share a common PCB design. After the PCBs are compatible, most of the diversity frequency bands do not need to be re-debugged, thereby reducing the cost and time of RF debugging and reducing certification fees.

[0081] It can be seen that the diversity circuit disclosed in this embodiment can easily adapt to different CA combination configurations. For example, mobile phones that support and do not support the downlink CA function can share the same PCB design, shortening the development period and reducing development costs. In addition, compared with the solution with DiFEM module in the prior art, the diversity circuit disclosed in this embodiment has better performance and price. At the same time, it can filter a single frequency band with poor performance, reduce development risks, and reduce the development cycle and certification and debugging costs.

[0082] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these 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 these modifications and variations.

Claims

1. A diversity circuit, characterized in that: include: A first single-pole multi-throw switch, a second single-pole multi-throw switch, a first combiner, a plurality of diversity filters, a diversity antenna, and a radio frequency transceiver; After receiving the radio frequency signal, the diversity antenna inputs the radio frequency signal into the first combiner, and the first combiner performs frequency division processing on the radio frequency signal to obtain a first frequency division signal and a second frequency division signal, and inputs the first frequency division signal and the second frequency division signal into the first single-pole multi-throw switch and the second single-pole multi-throw switch respectively; wherein the first frequency division signal and the second frequency division signal are signals of different frequency bands; The first single-pole multi-throw switch and the second single-pole multi-throw switch respectively switch the first frequency-divided signal and the second frequency-divided signal to the diversity filter; After the diversity filter filters the radio frequency signal in the corresponding frequency range, the filtered radio frequency signal is input into the radio frequency transceiver for signal processing.

2. The diversity circuit according to claim 1, characterized in that The first combiner includes a low-frequency low-pass filter and a medium- and high-frequency high-pass filter.

3. The diversity circuit according to claim 2, characterized in that: The low-frequency low-pass filter allows frequencies to pass in a range of 698 MHz to 960 MHz, and the medium- and high-frequency high-pass filter allows frequencies to pass in a range of 1710 MHz to 2700 MHz.

4. The diversity circuit according to claim 2, characterized in that: Also included is a second combiner; The input end of the second combiner is connected to the output end of the first combiner, and the output end of the second combiner is connected to the input end of the second single-pole multi-throw switch.

5. The diversity circuit according to claim 4, characterized in that: The second combiner includes a medium-low frequency low-pass filter and a high-frequency high-pass filter.

6. The diversity circuit according to claim 5, characterized in that: The medium-low frequency low-pass filter allows frequencies to pass in the range of 698 MHz to 2200 MHz, and the high-frequency high-pass filter allows frequencies to pass in the range of 2300 MHz to 2700 MHz.

7. The diversity circuit according to claim 1, wherein: Also included is an antenna toggle switch; The antenna switching switch is connected between the first combiner and the diversity antenna.

8. The diversity circuit according to claim 7, characterized in that The antenna switching switch includes a double-pole double-throw switch or a triple-pole triple-throw switch.

9. The diversity circuit according to claim 8, characterized in that It also includes a third single-pole multi-throw switch; the input end of the third single-pole multi-throw switch is connected to the output end of the first single-pole multi-throw switch, and the output end of the third single-pole multi-throw switch is connected to the diversity filter.

10. The diversity circuit according to claim 9, characterized in that Also includes dual saw filters; The input end of the dual saw filter is connected to the output end of the first single-pole multi-throw switch, and the output end is connected to the radio frequency transceiver.

11. A diversity circuit, characterized in that: include: a first single-pole multi-throw switch, a plurality of diversity filters, a diversity antenna, and a radio frequency transceiver; After receiving the RF signal, the diversity antenna inputs the RF signal into the first single-pole multi-throw switch. The first single-pole multi-throw switch switches the RF signal to the plurality of diversity filters. After the diversity filters perform frequency band filtering on the RF signal in the corresponding frequency range, the filtered RF signal is input into the RF transceiver for signal processing.

12. A radio frequency device, characterized in that: Comprising the diversity circuit as claimed in any one of claims 1-11.

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