Radio-frequency front-end Anti-interference filtering segmentation method, and electronic device and radio-frequency front-end module

Abstract

Provided in the present invention are a radio-frequency front-end anti-interference filtering segmentation method, and an electronic device and a radio-frequency front-end module. Operating bandwidths, the number and center frequencies of radio-frequency filters required by a switch filter circuit are determined on the basis of radio-frequency operating frequency bands, and the principle of minimizing the number of radio-frequency filters or the principle of maximizing an anti-interference capability; as such, operating parameters of the required radio-frequency filters can be flexibly designed on the basis of radio-frequency operating frequency bands to be covered, thereby achieving customized filtering performance optimization, and providing reverse guidance for the design of the radio-frequency filters; moreover, when there is an overlapping region between the operating bandwidths of two radio-frequency filters having adjacent bandwidths in the switch filter circuit, for radio-frequency operating frequency points in the overlapping region, one of the two radio-frequency filters corresponding to the overlapping region is selected on the basis of different filtering requirements to perform anti-interference filtering processing on the radio-frequency operating frequency points, thereby effectively taking into consideration other performance requirements while achieving high-precision filtering and directional accurate filtering.

Description

Radio frequency front-end anti-interference filtering segmentation method, electronic equipment and radio frequency front-end module Technical Field

[0001] The present invention relates to the field of radio frequency filtering technology, and in particular to a radio frequency front-end anti-interference filtering segmentation method, electronic equipment, and a radio frequency front-end module. Background Art

[0002] The current electromagnetic spectrum resources are becoming increasingly congested, and the electromagnetic environment is becoming increasingly complex. This has led to increasingly stringent anti-interference requirements for RF front-ends in existing broadband electronic systems, such as high-capacity communications and imaging radar. RF filters are RF electronic devices that attenuate or filter out interference signals. Using multiple RF filters to form a switching filter circuit to implement broadband RF front-end anti-interference filtering has become an important technical means of enhancing the anti-interference capabilities of broadband electronic systems. The switching filter circuit uses multiple switches to switch between multiple RF filters. RF filters with different bandwidths perform anti-interference filtering on channels within different bandwidth ranges in the RF front-end, thereby providing broadband anti-interference filtering for the RF front-end.

[0003] However, the switching filter circuit currently designed for broadband anti-interference filtering still has many defects:

[0004] 1) Generally, the switching filter circuit is designed based on the already manufactured RF filter and covers the RF working band with a higher frequency. The designed switching filter circuit is universal, with a fixed structure and fixed filtering performance. It can be used in many scenarios with low filtering performance requirements, but it is no longer applicable in some scenarios with relatively high filtering performance requirements.

[0005] 2) Generally, the target is to cover the RF working frequency band with higher frequency and the switching filter circuit is designed based on the already manufactured RF filter. However, due to the structural performance of the RF filter, the designed switching filter circuit cannot perform anti-interference filtering on certain RF working frequency bands, and the designed switching filter circuit cannot reversely guide the design of the RF filter.

[0006] Summary of the Invention

[0007] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a segmented technical solution for anti-interference filtering of an RF front-end. First, the working bandwidth, number and center frequency of the RF filter required for the switching filtering circuit are determined according to the RF working frequency band, and the working parameters of the required RF filter are flexibly designed based on the RF working frequency band to be covered, thereby achieving tailor-made filtering performance with optimal performance and reversely guiding the design of the RF filter; when there is an overlapping area in the working bandwidths of two RF filters with adjacent bandwidths in the switching filtering circuit, for the RF working frequency points in the overlapping area, one of the two RF filters corresponding to the overlapping area is selected according to the different filtering requirements of the RF front-end to perform anti-interference filtering on the RF working frequency points, thereby achieving high-precision filtering while effectively taking into account other performance requirements of the RF front-end or electronic system, further realizing directional and precise filtering.

[0008] To achieve the above-mentioned objectives and other related objectives, the present invention provides the following technical solutions.

[0009] A radio frequency front-end anti-interference filtering segmentation method, comprising:

[0010] Obtaining a radio frequency operating frequency band to be covered by the radio frequency front end, and determining the required operating bandwidth, number, and center frequency of the radio frequency filters based on the principle of minimizing the number of radio frequency filters or maximizing anti-interference capability according to the radio frequency operating frequency band, so that the operating bandwidth of the switching filter circuit formed by each of the radio frequency filters at least covers each channel of the radio frequency front end;

[0011] When there is an overlapping area in the working bandwidths of the two RF filters with adjacent bandwidths in the switching filter circuit, for the RF operating frequency point in the overlapping area, one of the two RF filters corresponding to the overlapping area is selected according to the parameter priority of the RF front-end to perform anti-interference filtering on the RF operating frequency point.

[0012] Optionally, the step of determining the required operating bandwidth, quantity, and center frequency of the radio frequency filter according to the radio frequency operating frequency band includes:

[0013] Based on the principle of minimizing the number of radio frequency filters, the operating bandwidth of each radio frequency filter is designed to be the maximum operating bandwidth;

[0014] Obtaining the starting frequency and ending frequency of the RF operating frequency band, and sequentially arranging the RF filters so that the operating bandwidth of each RF filter covers each channel of the RF front-end and continuously and completely covers the RF operating frequency band from the starting frequency to the ending frequency, and the operating bandwidths of two adjacent RF filters have an overlapping region, and the bandwidth of the overlapping region is the sum of the intermediate frequency signal bandwidth of the RF front-end and the frequency drift value of the RF filter within the full temperature range;

[0015] According to the arrangement and coverage of each of the RF filters, the number of the RF filters required to continuously and completely cover the RF operating frequency band from the starting frequency to the ending frequency is calculated, and the center frequency of each of the RF filters is calculated.

[0016] Optionally, the maximum operating bandwidth of the RF filter is greater than or equal to the sum of the intermediate frequency signal bandwidth of the RF front end, the frequency interval between two adjacent channels, and the frequency drift value of the RF filter within the full temperature range.

[0017] Optionally, the step of determining the required operating bandwidth, quantity, and center frequency of the radio frequency filter according to the radio frequency operating frequency band includes:

[0018] Based on the principle of maximizing the anti-interference capability, the operating bandwidth of each of the RF filters is designed to be a minimum operating bandwidth, and the minimum operating bandwidth that the RF filter can achieve is greater than the sum of the intermediate frequency signal bandwidth of the RF front end and the frequency drift value of the RF filter within the full temperature range;

[0019] Obtaining the starting frequency and ending frequency of the RF operating frequency band, and sequentially arranging the RF filters so that the operating bandwidth of each RF filter covers each channel of the RF front-end and continuously and completely covers the RF operating frequency band from the starting frequency to the ending frequency, and the operating bandwidths of two adjacent RF filters have an overlapping region, and the bandwidth of the overlapping region is the sum of the intermediate frequency signal bandwidth of the RF front-end and the frequency drift value of the RF filter within the full temperature range;

[0020] According to the arrangement and coverage of each of the RF filters, the number of the RF filters required to continuously and completely cover the RF operating frequency band from the starting frequency to the ending frequency is calculated, and the center frequency of each of the RF filters is calculated.

[0021] Optionally, when the minimum bandwidth that the RF filter can achieve is greater than the sum of the intermediate frequency signal bandwidth of the RF front end, the frequency interval value between two adjacent channels, and the frequency drift value of the RF filter within the full temperature range, the minimum operating bandwidth of the RF filter is designed to be the minimum bandwidth that the RF filter can achieve; when the minimum bandwidth that the RF filter can achieve is less than or equal to the sum of the intermediate frequency signal bandwidth of the RF front end, the frequency interval value between two adjacent channels, and the frequency drift value of the RF filter within the full temperature range, and is greater than the sum of the intermediate frequency signal bandwidth of the RF front end and the frequency drift value of the RF filter within the full temperature range, the minimum operating bandwidth of the RF filter is designed to be the sum of the intermediate frequency signal bandwidth of the RF front end, the frequency interval value between two adjacent channels, and the frequency drift value of the RF filter within the full temperature range.

[0022] Optionally, the step of determining the required operating bandwidth, quantity, and center frequency of the radio frequency filter according to the radio frequency operating frequency band includes:

[0023] Based on the principle of maximizing the anti-interference capability, the operating bandwidth of each of the RF filters is designed to be a minimum operating bandwidth. The minimum bandwidth that the RF filter can achieve is less than or equal to the sum of the intermediate frequency signal bandwidth of the RF front end and the frequency drift value of the RF filter within the full temperature range. The minimum operating bandwidth of the RF filter is designed to be the sum of the intermediate frequency signal bandwidth of the RF front end and the frequency drift value of the RF filter within the full temperature range, so that each of the RF filters can just perform frequency selective filtering on one channel within the RF operating frequency band.

[0024] Obtaining the starting frequency and ending frequency of the RF operating frequency band, and sequentially arranging the RF filters so that the operating bandwidth of each RF filter is discretely and discontinuously distributed from the starting frequency to the ending frequency and covers each channel of the RF front end, and the operating bandwidths of two adjacent RF filters do not overlap;

[0025] According to the arrangement and coverage of each of the RF filters, the number of RF filters required to discretely and discontinuously distribute and cover each channel of the RF front end from the starting frequency to the ending frequency is calculated, and the center frequency of each of the RF filters is calculated. The number of the RF filters is the same as the number of the channels, and the center frequency of the RF filter is the same as the RF operating frequency of the channel.

[0026] Optionally, the step of selecting, for the RF operating frequency point in the overlapping area, one of the two RF filters corresponding to the overlapping area according to the parameter priority of the RF front end to perform anti-interference filtering on the RF operating frequency point includes:

[0027] Determining a boundary operating frequency point of the overlapping area according to the parameter priority of the radio frequency front end;

[0028] Compare the performance of the RF front end at the RF operating frequency with the performance at the boundary operating frequency, and select one of the two RF filters corresponding to the overlapping area to perform anti-interference filtering on the RF operating frequency according to the comparison result.

[0029] Optionally, the step of determining the boundary operating frequency point of the overlapping area according to the parameter priority of the radio frequency front end includes:

[0030] Designing a sliding window, wherein the center frequency of the sliding window is the frequency point in the overlapping area, and the frequency width of the sliding window is the intermediate frequency signal bandwidth of the RF front end;

[0031] Prioritizing signal amplitude, in the overlapping region, the sliding window is gradually slid from the minimum value of the frequency point to the maximum value of the frequency point, and when the absolute value of the difference in amplitude flatness between the two RF filters within the frequency range of the sliding window reaches a minimum, the center frequency of the sliding window is the boundary operating frequency point; or prioritizing signal phase, in the overlapping region, the sliding window is gradually slid from the minimum value of the frequency point to the maximum value of the frequency point, and when the absolute value of the difference in phase linearity between the two RF filters within the frequency range of the sliding window reaches a minimum, the center frequency of the sliding window is the boundary operating frequency point; or prioritizing signal delay, in the overlapping region, the sliding window is gradually slid from the minimum value of the frequency point to the maximum value of the frequency point, and when the absolute value of the difference in group delay fluctuation between the two RF filters within the frequency range of the sliding window reaches a minimum, the center frequency of the sliding window is the boundary operating frequency point;

[0032] Among them, in the two radio frequency filters corresponding to the overlapping area, the center frequency of the former radio frequency filter is lower than the center frequency of the latter radio frequency filter.

[0033] An electronic device, comprising:

[0034] one or more processors;

[0035] A storage device for storing one or more programs, which, when executed by the one or more processors, enables the electronic device to implement any of the above-mentioned RF front-end anti-interference filtering segmentation methods.

[0036] A radio frequency front-end module comprises a switching filter circuit manufactured under the guidance of any of the above-mentioned radio frequency front-end anti-interference filtering segmentation methods.

[0037] As described above, the RF front-end anti-interference filtering segmentation method, electronic device, and RF front-end module of the present invention have the following beneficial effects:

[0038] Based on the principle of minimizing the number of RF filters or maximizing the anti-interference capability, the working bandwidth, number and center frequency of the RF filters required for the switching filter circuit are determined according to the RF working frequency band, and then the working parameters of the required RF filters can be flexibly designed according to the RF working frequency band to be covered, so as to achieve tailor-made filtering performance with optimal measures according to local conditions and reversely guide the design of the RF filter; when there is an overlapping area in the working bandwidths of two RF filters with adjacent bandwidths in the switching filter circuit, for the RF working frequency points in the overlapping area, one of the two RF filters corresponding to the overlapping area is selected according to the parameter priority of the RF front-end to perform anti-interference filtering on the RF working frequency points, and the parameter priority of the RF front-end can be flexibly selected and designed according to the different filtering requirements of the RF front-end, while achieving high-precision filtering, it can effectively take into account other performance requirements of the RF front-end or the electronic system, further realizing directional and precise filtering. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] FIG1 is a schematic diagram showing the steps of the radio frequency front-end anti-interference filtering segmentation method according to the present invention.

[0040] 2 to 5 are schematic diagrams showing the arrangement and overlap of various radio frequency filters in the radio frequency operating frequency band to be covered in different optional embodiments of the present invention.

[0041] FIG6 shows a curve showing the variation of insertion loss and group delay of an acoustic filter with a center frequency of 965 MHz used in an optional embodiment of the present invention.

[0042] FIG7 is a schematic structural diagram of a computer system 700 corresponding to an electronic device according to an optional embodiment of the present invention. DETAILED DESCRIPTION

[0043] As described above in the background technology, the inventors have found that the currently designed switching filter circuits for broadband anti-interference filtering still have many defects: generally, the switching filter circuit is designed to cover the RF working frequency band with a higher frequency and based on the already manufactured RF filter. The designed switching filter circuit is universal, with a fixed structure and fixed filtering performance. It can be used in many scenarios where the filtering performance requirements are not high, but it is no longer applicable to certain occasions where the filtering performance requirements are relatively high; at the same time, due to the structural performance of the RF filter, the designed switching filter circuit cannot perform anti-interference filtering on certain RF working frequency bands, and the designed switching filter circuit cannot reversely guide the design of the RF filter.

[0044] Based on this, the present invention proposes a segmented technical solution for anti-interference filtering of the RF front-end: first, based on the principle of minimizing the number of RF filters or maximizing the anti-interference capability, the working bandwidth, number and center frequency of the RF filters required for the switching filtering circuit are determined according to the RF working frequency band, and then the working parameters of the required RF filters are flexibly designed according to the RF working frequency band to be covered, so as to achieve tailor-made filtering performance with optimal performance and reversely guide the design of the RF filter; secondly, when there is an overlapping area in the working bandwidths of two RF filters with adjacent bandwidths in the switching filtering circuit, for the RF working frequency points in the overlapping area, one of the two RF filters corresponding to the overlapping area is selected according to the different filtering requirements of the RF front-end to perform anti-interference filtering on the RF working frequency points, which can effectively take into account other performance requirements of the RF front-end or the electronic system while achieving high-precision filtering, and further realize directional and precise filtering.

[0045] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0046] Please refer to Figures 1 to 7. It should be noted that the diagrams provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the diagrams only show the components related to the present invention rather than being drawn according to the number, shape and size of the components during actual implementation. During actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated. The structure, proportion, size, etc. shown in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read. They are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0047] As shown in FIG1 , the present invention provides a radio frequency front-end anti-interference filtering segmentation method, which includes the following steps:

[0048] S1. Obtain a radio frequency operating frequency band to be covered by the radio frequency front end, and based on the principle of minimizing the number of radio frequency filters or maximizing anti-interference capability, determine the required operating bandwidth, number, and center frequency of the radio frequency filters according to the radio frequency operating frequency band, so that the operating bandwidth of the switching filter circuit formed by each radio frequency filter at least covers each channel of the radio frequency front end;

[0049] S2. When the operating bandwidths of two RF filters with adjacent bandwidths in the switching filter circuit overlap, for the RF operating frequency points in the overlapping region, select one of the two RF filters corresponding to the overlapping region according to the parameter priority of the RF front end to perform anti-interference filtering on the RF operating frequency points;

[0050] S3. For a certain RF operating frequency point, if it falls within an area other than the overlapping area of ​​the RF filter's operating bandwidth, select a corresponding RF filter to perform anti-interference filtering on the RF operating frequency point.

[0051] In detail, in step S1, the RF working frequency band to be covered by the RF front end can be obtained through actual measurement or external acquisition input. The RF working frequency band is composed of multiple different working frequency ranges, which can be a continuous RF working frequency band or a discontinuous discrete RF working frequency band. The RF working frequency band to be covered at least covers each channel of the RF front end. The design can be selected according to actual conditions and is not limited here.

[0052] It should be noted that there are two methods to determine the operating bandwidth, quantity and center frequency of the RF filters required to cover the RF operating frequency band, namely, a method based on the principle of minimizing the number of RF filters and a method based on the principle of maximizing anti-interference capability. The operating bandwidth, quantity and center frequency of the RF filters required to cover the RF operating frequency band can be determined by using one of the two methods or using both methods at the same time.

[0053] Specifically, in step S1, in an optional embodiment of the present invention, the step of determining the required operating bandwidth, number, and center frequency of the RF filter according to the RF operating frequency band further includes:

[0054] S11. Based on the principle of minimizing the number of RF filters, the operating bandwidth of each RF filter is designed to be the maximum operating bandwidth;

[0055] S12. Obtain the starting frequency and ending frequency of the RF operating frequency band, and arrange the RF filters in sequence so that the operating bandwidth of each RF filter covers each channel of the RF front-end and just continuously and completely covers the RF operating frequency band from the starting frequency to the ending frequency, and there is an overlapping area in the operating bandwidths of two adjacent RF filters. The bandwidth of the overlapping area is the sum of the intermediate frequency signal bandwidth of the RF front-end and the frequency drift value of the RF filter within the full temperature range;

[0056] S13. Calculate the number of RF filters required to continuously and completely cover the RF operating frequency band from the starting frequency to the ending frequency based on the arrangement and coverage of each RF filter, and calculate the center frequency of each RF filter.

[0057] More specifically, in step S11, based on the principle of minimizing the number of RF filters, the operating bandwidth BW of each RF filter is designed to be the maximum operating bandwidth. The maximum operating bandwidth is the maximum bandwidth that the RF filter itself can achieve, so that each RF filter can perform anti-interference filtering on as many channels of different RF operating frequencies as possible in the RF front end, and the operating bandwidth BW of each RF filter is determined. The operating bandwidths BW of each RF filter can be the same or different. The maximum operating bandwidth of the RF filter is greater than or equal to the sum of the intermediate frequency signal bandwidth SBW of the RF front end, the frequency spacing value FD between two adjacent channels, and the frequency drift value FP of the RF filter within the full temperature range.

[0058] Among them, the working bandwidth BW of the RF filter can be designed according to actual needs, such as 3dB bandwidth or 1dB bandwidth; when there are multiple intermediate frequency signal bandwidths in the RF front-end, the intermediate frequency signal bandwidth SBW of the RF front-end is the maximum value of all intermediate frequency signal bandwidths in the RF front-end; the frequency interval value FD between two adjacent channels is the absolute value of the difference between the center frequency of a channel and the center frequency of its adjacent channel; the frequency drift value FP of the RF filter in the full temperature range is the difference DT between the highest operating temperature and the lowest operating temperature in the operating temperature range, the frequency temperature coefficient TCF of the RF filter, and the center frequency f of the RF filter. g The product of the three, that is, FP = DT * TCF * f g , which is also equal to the sum of the absolute value FP1 of the center frequency value of the RF filter drifting towards the high frequency direction due to different operating temperatures in the full temperature range and the absolute value FP2 of its drifting towards the low frequency direction.

[0059] In more detail, in step S12, based on obtaining the working bandwidth BW of each RF filter, the starting frequency f of the RF working frequency band is RFL To the end frequency f RFH Arrange the RF filters in sequence so that the working bandwidth of each RF filter covers each channel of the RF front end and just starts from the starting frequency f RFL To the end frequency f RFH The RF operating frequency band is continuously and completely covered, and the operating bandwidths of two RF filters with adjacent bandwidths are designed to have an overlapping area, and the bandwidth Y of the overlapping area is the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range.

[0060] In step S12, after the radio frequency operating frequency band is determined, it is known that the starting frequency of the radio frequency operating frequency band is f RFL , the end frequency of the RF working band is f RFH, the intermediate frequency signal bandwidth of the RF front end is SBW, the difference between the highest operating temperature and the lowest operating temperature of the RF filter within the operating temperature range is DT, the frequency temperature coefficient of the RF filter is TCF, and the relative bandwidth of the RF filter corresponding to the operating frequency is RBW. Assume that N RF filters are needed to cover the RF operating frequency band (N is a positive integer ≥ 2). In order to ensure the RF operating frequency band (the operating frequency starts from the starting frequency f RFL To the end frequency f RFH ) are continuously covered, the operating bandwidths of two adjacent RF filters need to have an overlapping area, and the bandwidth Y of the overlapping area is not less than (greater than or equal to) the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range. In an optional embodiment of the present invention, the bandwidth Y of the overlapping area is just set to the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range.

[0061] In more detail, in step S13, according to the arrangement coverage of each RF filter in step S12, the frequency of the filter just starting from the starting frequency f is calculated. RFL To the end frequency f RFH The number of RF filters required to continuously and completely cover the RF operating frequency band, and calculate the center frequency f of each RF filter g .

[0062] Furthermore, in step S13, as shown in FIG2 , the specific steps for calculating the number N of RF filters are as follows:

[0063] First, because the relative bandwidth RBW of the RF filter is the absolute bandwidth BW of the RF filter and the center frequency f of the RF filter g The absolute bandwidth BW of the RF filter is:

[0064] Then get Denoted as formula (1),

[0065] The operating bandwidth of the first RF filter 101 can be obtained by formula (1): Wherein, RBW1 is the relative bandwidth of the first RF filter 101. BW1 must be larger than the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the first RF filter 101 within the full temperature range.

[0066] Then, the operating bandwidth BW2 of the second RF filter 102 is calculated. Wherein, Y1 is the bandwidth of the overlapping region of the working bandwidths of the first RF filter 101 and the second RF filter 102;

[0067] Similarly, the working bandwidth BWi of the i-th RF filter 10i is calculated according to get Here, i is a positive integer greater than 2.

[0068] Preferably, the bandwidth Y of all overlapping areas is designed to be the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range (assuming that the frequency drift value FP of each RF filter within the full temperature range is equal), that is, Y1=Y2=…=Yi-1=Y=SBW+FP.

[0069] Therefore, the operating bandwidth of the i-th RF filter 10i is By analogy, when the working bandwidth BWN (N is changed to a subscript) of the Nth RF filter 10N is calculated, if the low-end cutoff frequency of the Nth RF filter 10N is less than the end frequency f of the RF working frequency band RFH The high-end cut-off frequency of the Nth RF filter 10N is greater than or equal to the end frequency f of the RF operating frequency band. RFH The condition is met, that is, When established, N is the number of RF filters required to cover the RF operating frequency band.

[0070] At the same time, the center frequency f of the RF filter g The absolute bandwidth BW of each RF filter and the starting frequency of the RF working band can be RFL And the end frequency of the RF working band is f RFH The calculation will not be repeated here.

[0071] Specifically, in step S1, in another optional embodiment of the present invention, the step of determining the required operating bandwidth, quantity, and center frequency of the radio frequency filter according to the radio frequency operating band further includes:

[0072] S101. Based on the principle of maximizing anti-interference capability, the operating bandwidth of each RF filter is designed to be the minimum operating bandwidth. The minimum operating bandwidth that the RF filter can achieve is greater than the sum of the IF signal bandwidth of the RF front end and the frequency drift value of the RF filter within the full temperature range.

[0073] S102. Obtain the start frequency and end frequency of the RF operating frequency band, and arrange the RF filters in sequence so that the operating bandwidth of each RF filter covers each channel of the RF front-end and continuously and completely covers the RF operating frequency band from the start frequency to the end frequency, and the operating bandwidths of two adjacent RF filters overlap, and the bandwidth of the overlapping area is the sum of the intermediate frequency signal bandwidth of the RF front-end and the frequency drift value of the RF filter within the full temperature range;

[0074] S103 , calculating the number of RF filters required to continuously and completely cover the RF operating frequency band from the starting frequency to the ending frequency according to the arrangement and coverage of each RF filter, and calculating the center frequency of each RF filter.

[0075] In more detail, in step S101, based on the principle of maximizing anti-interference capability, the working bandwidth BW of each RF filter is designed to be the minimum working bandwidth, and the maximum working bandwidth is the maximum bandwidth that the RF filter itself can reach, and the working bandwidth BW of each RF filter is determined. The working bandwidths BW of each RF filter can be the same or different.

[0076] It should be noted that there are three specific values ​​for the minimum operating bandwidth of the RF filter:

[0077] 1) In the first case, when the minimum bandwidth that the RF filter can achieve is greater than the sum of the intermediate frequency signal bandwidth SBW of the RF front end, the frequency interval value FD between two adjacent channels, and the frequency drift value FP of the RF filter within the full temperature range, the minimum operating bandwidth of the RF filter can be taken as the minimum bandwidth that the RF filter can achieve. The minimum operating bandwidth of the RF filter is designed to be the minimum bandwidth that the RF filter can achieve.

[0078] 2) The second case is when the minimum bandwidth that the RF filter can achieve is less than or equal to the sum of the intermediate frequency signal bandwidth SBW of the RF front end, the frequency interval value FD between two adjacent channels, and the frequency drift value FP of the RF filter within the full temperature range, and is greater than the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range, the minimum operating bandwidth of the RF filter is designed to be the sum of the intermediate frequency signal bandwidth SBW of the RF front end, the frequency interval value FD between two adjacent channels, and the frequency drift value FP of the RF filter within the full temperature range;

[0079] 3) The third situation is that when the minimum bandwidth that the RF filter itself can achieve is less than or equal to the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range, the working bandwidths of the two adjacent RF filters arranged and designed in the subsequent step St2 do not have an overlapping area, which will be explained in detail in another optional embodiment of the present invention.

[0080] In more detail, in step S102, based on obtaining the working bandwidth BW of each RF filter, the starting frequency f of the RF working frequency band is RFL To the end frequency f RFH Arrange the RF filters in sequence so that the working bandwidth of each RF filter covers each channel of the RF front end and just starts from the starting frequency f RFL To the end frequency f RFH Continuously and completely cover the RF working frequency band. Assume that N RF filters are needed to cover the RF working frequency band (N is a positive integer ≥ 2). In order to ensure the RF working frequency band (the working frequency starts from the starting frequency f RFL To the end frequency f RFH ) are continuously covered, the operating bandwidths of two adjacent RF filters need to have an overlapping area, and the bandwidth Y of the overlapping area is not less than (greater than or equal to) the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range. For example, the bandwidth Y of the overlapping area is exactly set to the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range.

[0081] Furthermore, in step S102, as shown in FIG3, when the minimum bandwidth that the RF filter can achieve itself is greater than the sum of the intermediate frequency signal bandwidth SBW of the RF front end, the frequency interval value FD between two adjacent channels and the frequency drift value FP of the RF filter within the full temperature range, the minimum operating bandwidth of the RF filter is designed to be the minimum bandwidth that the RF filter can achieve. Compared with the embodiment shown in FIG2, due to the reduction of its bandwidth, the number of RF frequency bands or channels that it can cover is smaller; in step St2, as shown in FIG4, when the minimum bandwidth that the RF filter can achieve itself is less than or equal to the intermediate frequency signal bandwidth SBW of the RF front end, the frequency interval value FD between two adjacent channels and the frequency drift value FP of the RF filter within the full temperature range, the minimum operating bandwidth of the RF filter is designed to be the minimum bandwidth that the RF filter can achieve. When the sum of the frequency spacing value FD between the two adjacent channels and the frequency drift value FP of the RF filter within the full temperature range is greater than the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range, the minimum operating bandwidth of the RF filter is designed to be the sum of the intermediate frequency signal bandwidth SBW of the RF front end, the frequency spacing value FD between two adjacent channels and the frequency drift value FP of the RF filter within the full temperature range. Compared with the embodiments shown in Figures 2 and 3, due to the further reduction of its bandwidth, the RF frequency band range that it can cover is further reduced or the number of channels is further reduced, but it can at least completely cover one channel.

[0082] In more detail, in step S103, according to the arrangement coverage of each RF filter in step S102, the frequency of the filter just starting from the starting frequency f is calculated. RFL To the end frequency f RFH The number of RF filters required to continuously and completely cover the RF operating frequency band, and calculate the center frequency f of each RF filter g The specific calculation process can refer to the description of the above embodiment and will not be repeated here.

[0083] In detail, in step S1, for the third case of the minimum operating bandwidth of the RF filter, when the minimum bandwidth that the RF filter itself can achieve is less than or equal to the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range, in another optional embodiment of the present invention, the step of determining the required operating bandwidth, number, and center frequency of the RF filter according to the RF operating frequency band further includes:

[0084] S110. Based on the principle of maximizing anti-interference capability, design the operating bandwidth of each RF filter to be the minimum operating bandwidth. When the minimum bandwidth that the RF filter can achieve is less than or equal to the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range, design the minimum operating bandwidth of the RF filter to be the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range, so that each RF filter can just perform frequency selective filtering on one channel within the RF operating frequency band.

[0085] S120, obtaining the starting frequency f of the radio frequency operating band RFL and the stop frequency f RFH , arrange the RF filters in sequence so that the working bandwidth of each RF filter just starts from the starting frequency f RFL To the end frequency f RFH Discretely and discontinuously distributed and covering each channel of the RF front end, and there is no overlapping area between the working bandwidths of two adjacent RF filters;

[0086] S130, according to the arrangement coverage of each radio frequency filter, calculate the frequency just from the starting frequency f RFL To the end frequency f RFH The number of RF filters required to discretely and discontinuously distribute and cover each channel of the RF front end is calculated, and the center frequency of each RF filter is calculated. The number of RF filters is the same as the number of channels, and the center frequency of the RF filter is the same as the RF operating frequency of the channel.

[0087] In more detail, in steps S110 to S130, for the third case of the minimum operating bandwidth of the RF filter, when the minimum bandwidth that the RF filter can achieve is less than or equal to the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range, the minimum operating bandwidth of the RF filter is designed to be the sum of the intermediate frequency signal bandwidth SBW of the RF front end and the frequency drift value FP of the RF filter within the full temperature range, so that each RF filter can just perform frequency selective filtering on one channel within the RF operating frequency band. In this case, because the frequency interval value FD between two adjacent channels is generally greater than the intermediate frequency signal bandwidth SBW of the RF front end, the operating bandwidths of two adjacent RF filters do not overlap. As shown in FIG5 , the RF filters cannot achieve continuous coverage of the RF operating frequency band. The operating bandwidths of each RF filter are discretely and discontinuously distributed, and each RF filter performs frequency selective filtering on each channel one-to-one. The number of RF filters is the same as the number of channels within the RF operating frequency band, and the center frequency of the RF filter is the same as the RF operating frequency corresponding to the channel.

[0088] It should be noted that if the number N of RF filters calculated in step S1 is equal to 2 n or 2 n -i, the final value of the number of RF filters is taken as the calculated value; if the calculated number of RF filters N is equal to 2 n +j, the number of RF filters N is reduced by adjusting the center frequency and operating bandwidth of at least one RF filter, so that the final value of the number of RF filters is equal to 2 n ; Where n is a positive integer, i and j are preset thresholds.

[0089] In detail, since the final designed RF filters must be combined with all the RF switches to design a switch filter circuit, the switch filter circuit switches between the various RF filters through all the RF switches, and all the RF switches are mainly designed as 1-to-2, 1-to-4, 1-to-8, etc. 1-to-2 n Therefore, in order to improve the utilization rate of the switching channel of the RF switch, so as to avoid more vacancies and waste of resources, and further reduce the insertion loss of the overall switch filter circuit, if the calculated number of RF filters N is just equal to or slightly less than the common multiple of 2, 4 or 8, such as the power of 2 (i.e. 2 n ), such as 8, 16, 32, and 7, 15, 30, 31, etc. At this time, the final value of the number of RF filters is taken as the calculated value, and the utilization rate of the switching channel of the RF switch is higher; if the calculated number of RF filters N is slightly larger than the power exponent of 2 such as the common multiple of 2, 4 or 8 (i.e. 2 n ), then broaden the working bandwidth of at least one RF filter to reduce the number of RF filters, such as moving the center frequency of one or more RF filters to a high frequency, and increase the working bandwidth of the corresponding RF filter to reduce the number of RF filters to a power of 2 such as a common multiple of 2, 4 or 8 (i.e. 2 n ). However, this adjustment method is not applicable to the case where each radio frequency filter in the anti-interference capability maximization method performs one-to-one frequency selective filtering on each radio frequency channel.

[0090] In detail, in step S2, for the situation shown in Figures 2 to 4, when there is an overlapping area in the working bandwidths of two RF filters with adjacent bandwidths in the switching filter circuit, for the RF operating frequency in the overlapping area, one of the two RF filters corresponding to the overlapping area is selected according to the parameter priority of the RF front-end to perform anti-interference filtering on the RF operating frequency.

[0091] In the overlapping region, the center frequency of the first RF filter is lower than that of the second. The filter with the lower center frequency is called the low-frequency RF filter, and the filter with the higher center frequency is called the high-frequency RF filter. Within the frequency range where the operating bandwidths of the low-frequency and high-frequency RF filters overlap, the decision is made as to whether to use the low-frequency or high-frequency RF filter at each RF operating frequency.

[0092] Generally speaking, as the operating frequency of the RF filter gradually moves from the center frequency to the sides (towards lower or higher), the performance of the RF filter will gradually deteriorate. In other words, the performance near the cutoff frequencies at both ends of the RF filter is worse than the performance at the center frequency. Therefore, in step S2, a boundary operating frequency point can be first determined, and the performance of the RF front end at the RF operating frequency point can be compared with the performance at the boundary operating frequency point. Based on the performance comparison results, it is determined whether to use a low-frequency RF filter or a high-frequency RF filter for each RF operating frequency point.

[0093] Based on this, in an optional embodiment of the present invention, for the RF operating frequency point in the overlapping area, step S2 of selecting one of the two RF filters corresponding to the overlapping area according to the parameter priority of the RF front end to perform anti-interference filtering on the RF operating frequency point may further include:

[0094] S21. Determine the boundary operating frequency point of the overlapping area according to the parameter priority of the radio frequency front end;

[0095] S22. Compare the performance of the RF front end at the RF operating frequency with the performance at the boundary operating frequency, and select one of the two RF filters corresponding to the overlapping area to perform anti-interference filtering on the RF operating frequency based on the comparison result.

[0096] In detail, in steps S21 to S22, the RF filter selected for the RF operating frequency point in the overlapping area is confirmed according to the parameter priority of the RF front-end: first, the boundary operating frequency point of the overlapping area is confirmed according to the parameter priority of the RF front-end, and when the operating frequency of the RF filter gradually moves from the center frequency to both sides (towards lower or higher), the performance of the RF filter will gradually deteriorate. Therefore, the midpoint of the performance deterioration of the two RF filters in the overlapping area can be found as the boundary operating frequency point; then the performance of the RF front-end at the RF operating frequency point is compared with the performance at the boundary operating frequency point, and the RF filter is selected according to the comparison result, and when the operating frequency of the RF filter gradually moves from the center frequency to both sides (towards lower or higher), the performance of the RF filter will gradually deteriorate. In the overlapping area As the RF operating frequency increases from the minimum value, the filtering performance of the RF filter with a lower center frequency gradually deteriorates, while the filtering performance of the RF filter with a higher center frequency gradually improves. The critical point between deterioration and improvement is the boundary operating frequency. Therefore, if the RF operating frequency is less than the boundary operating frequency, the performance of the RF front-end at the corresponding RF operating frequency is higher than the performance of the RF front-end at the boundary operating frequency. An RF filter with a lower center frequency is selected to perform anti-interference filtering on the RF operating frequency. If the RF operating frequency is greater than or equal to the boundary operating frequency, the performance of the RF front-end at the corresponding RF operating frequency is higher than or equal to the performance of the RF front-end at the boundary operating frequency. An RF filter with a higher center frequency is selected to perform anti-interference filtering on the RF operating frequency.

[0097] To meet the different filtering requirements of different electronic systems or RF front-ends, the boundary operating frequency points of the overlapping area can be determined based on the different parameter priorities of the RF front-end to meet the differentiated filtering needs of the electronic systems or RF front-ends. The different parameter priorities of the RF front-end can be signal amplitude priority, signal phase priority, signal delay priority, signal modulation method priority, etc., or a combination of multiple parameters.

[0098] In more detail, in an optional embodiment of the present invention, the boundary operating frequency of the overlapping area is obtained based on the signal amplitude of the electronic system or the radio frequency front end. In step S2, the step S21 of determining the boundary operating frequency of the overlapping area based on the parameter priority of the radio frequency front end further includes:

[0099] S211. Design a sliding window, where the center frequency of the sliding window is the frequency point in the overlapping region, and the frequency width of the sliding window is the intermediate frequency signal bandwidth of the RF front end;

[0100] S212. Prioritize signal amplitude. Within the overlapping region, gradually slide the sliding window from the minimum frequency point to the maximum frequency point. The amplitude flatness (denoted as X) of the first RF filter within the frequency range of the sliding window gradually deteriorates, while the amplitude flatness (denoted as Y) of the second RF filter within the frequency range of the sliding window gradually improves. The center frequency of the sliding window at the point where the absolute value of the difference in amplitude flatness (|XY|) between the two RF filters within the frequency range of the sliding window reaches the minimum is the boundary operating frequency point.

[0101] More specifically, in steps S211-S212, the amplitude flatness (i.e., fluctuation) of the two corresponding RF filters within the overlapping frequency range is evaluated, prioritizing the signal amplitude of the electronic system or RF front-end, to determine the boundary operating frequency. This evaluation process can be performed through simulation or actual measurement. As the sliding window gradually slides from the minimum frequency point to the maximum frequency point within the overlapping frequency range, the sliding frequency step can be set based on the frequency interval FD between two adjacent channels, such as 1kHz, 10kHz, 100kHz, 1MHz, 10MHz, etc.

[0102] In more detail, in another optional embodiment of the present invention, the boundary operating frequency of the overlapping area is obtained based on the signal phase priority of the electronic system or the radio frequency front end. In step S2, the step S21 of determining the boundary operating frequency of the overlapping area based on the parameter priority of the radio frequency front end further includes:

[0103] S2101. Design a sliding window, where the center frequency of the sliding window is the frequency point in the overlapping region, and the frequency width of the sliding window is the intermediate frequency signal bandwidth of the RF front end;

[0104] S2102. Prioritize the signal phase. Within the overlapping region, gradually slide the sliding window from the minimum frequency point to the maximum frequency point. The phase linearity (denoted as S) of the first RF filter within the frequency range of the sliding window gradually deteriorates, while the phase linearity (denoted as T) of the second RF filter within the frequency range of the sliding window gradually improves. The center frequency of the sliding window at the time when the absolute value (|ST|) of the difference between the phase linearities of the two RF filters within the frequency range of the sliding window reaches the minimum is the boundary operating frequency point.

[0105] In more detail, in steps S2101 to S2102, the signal phase of the electronic system or the RF front end is prioritized, and the phase linearity of the corresponding two RF filters in the frequency range of the overlapping area is evaluated to confirm the boundary operating frequency point. The specific evaluation process can be simulation or actual measurement.

[0106] In more detail, in another optional embodiment of the present invention, the step S21 of obtaining the boundary operating frequency of the overlapping area based on the signal delay priority of the electronic system or the radio frequency front end and determining the boundary operating frequency of the overlapping area based on the parameter priority of the radio frequency front end further includes:

[0107] S2110. Design a sliding window, where the center frequency of the sliding window is the frequency point in the overlapping region, and the frequency width of the sliding window is the intermediate frequency signal bandwidth of the RF front end;

[0108] S2120. With signal delay as a priority, within the overlapping region, the sliding window is gradually slid from the minimum frequency point to the maximum frequency point. The group delay fluctuation (denoted as M) of the first RF filter within the frequency range of the sliding window gradually deteriorates, while the group delay fluctuation (denoted as N') of the second RF filter within the frequency range of the sliding window gradually improves. When the absolute value of the difference in group delay fluctuations of the two RF filters within the frequency range of the sliding window (|MN`|) reaches the minimum, the center frequency of the sliding window is the boundary operating frequency point.

[0109] In more detail, in steps S2110 to S2120, the signal delay of the electronic system or the RF front end is prioritized, and the group delay fluctuations of the corresponding two RF filters within the frequency range of the overlapping area are evaluated to confirm the boundary operating frequency point. The specific evaluation process can be simulation or actual measurement.

[0110] In more detail, in another optional embodiment of the present invention, the demarcation operating frequency can also be determined based on the modulation scheme of the signal transmitted in the system channel. Specifically, a sliding window is first designed, with the frequency within the overlapping frequency range as the center frequency of the sliding window, and the frequency width of the sliding window is the intermediate frequency signal bandwidth of the RF front-end. The sliding window is then gradually slid from the minimum value to the maximum value of the overlapping frequency range. The input signal with the target modulation scheme, which uses the sliding window as frequency information, is fed into the low-frequency filter and the high-frequency filter respectively. The modulation scheme can be MSK, ASK, FSK, QAM, etc. The output signal quality is then checked through simulation or testing. As the sliding window moves, the signal quality of the low-frequency filter within the sliding window frequency range gradually deteriorates, while the signal quality of the high-frequency filter within the sliding window frequency range gradually improves. When the signal quality of the two reaches the closest state, the center frequency of the sliding window is the demarcation operating frequency. Specifically, the signal quality can be judged by checking the output signal's signal-to-noise ratio, error vector magnitude (EVM), and other technical indicators.

[0111] In addition, the electronic system or RF front-end that prioritizes other signal parameters can also be considered, and the boundary operating frequency can be confirmed based on the priority of other signal parameters. The specific confirmation process is similar to the above-mentioned signal amplitude priority, signal phase priority, and signal delay priority, and can also be similar to the confirmation method of signal modulation mode priority, which will not be repeated here. It is also possible to comprehensively consider multiple parameters (A, B, C...), sort them according to priority, and confirm the boundary operating frequency. Specifically, first sort each parameter (A, B, C...) according to priority, and use the above-mentioned principle method to confirm the boundary operating frequency corresponding to each parameter after sorting, and then confirm the final boundary operating frequency based on the electronic system or RF front-end indicator demand analysis to achieve the optimal state.

[0112] It should be noted that the RF filter in the present invention can be an acoustic filter. An acoustic filter is a RF filter implemented using an acoustic resonator. It has the advantages of being light, thin, low in insertion loss, high in rectangularity, and low in temperature coefficient. Common acoustic filters include surface acoustic wave (SAW) filters and film bulk acoustic resonator (FBAR) filters. Within the passband of the acoustic filter, there is a phenomenon in which the RF performance of the lower sideband close to the low cutoff frequency and the upper sideband close to the high cutoff frequency are inconsistent. Figure 6 shows an acoustic filter with a center frequency of 965MHz, a curve of S21 (insertion loss) varying with frequency, and a curve of group delay varying with frequency. It can be seen from Figure 6 that the acoustic filter has inconsistent group delay fluctuations on both sides of the passband. In view of the fact that the acoustic filter has inconsistent group delay fluctuations on both sides of the passband, for systems with priority given to group delay fluctuations, the boundary operating frequency of the switching filter circuit composed of the RF front-end acoustic filter can be determined by a similar method as described above, thereby achieving the optimal state of the system's anti-interference filtering.

[0113] Therefore, when determining the boundary operating frequency point, the priority parameters can be flexibly selected according to the parameter performance differences of the corresponding RF filters to meet different filtering requirements.

[0114] It is understandable that in other optional embodiments of the present invention, the boundary operating frequency point may not be determined, but the different RF frequency bands in the overlapping area may be directly divided, and the different RF frequency bands may be segmented and belong to different RF filters. For example, one segment belongs to an RF filter with a higher center frequency, one segment belongs to an RF filter with a lower center frequency, another segment belongs to an RF filter with a higher center frequency, and another segment belongs to an RF filter with a lower center frequency, etc., which will not be repeated here.

[0115] In detail, in step S3, based on the situations shown in Figures 2 to 5, for a certain RF operating frequency point, if it falls in an area other than the overlapping area in the working bandwidth of the RF filter, the corresponding RF filter is selected to perform anti-interference filtering on the RF operating frequency point, that is, the RF operating frequency point in the non-overlapping area is selected to perform anti-interference filtering on the RF operating frequency point.

[0116] In an optional embodiment of the present invention, a radio frequency front-end module is provided, which includes a switching filter circuit prepared under the guidance of the radio frequency front-end anti-interference filtering segmentation method described in any of the above items. The module can flexibly design the required operating parameters of the radio frequency filter according to the radio frequency working frequency band to be covered, and can reversely guide the design of the radio frequency filter. The prepared radio frequency filters constitute a switching filter circuit. Based on the customization of each radio frequency filter, the optimal filtering performance of the radio frequency front-end switching filter circuit is achieved, thereby improving the filtering accuracy of the radio frequency front-end switching filter circuit.

[0117] It should be noted that the RF front-end module is a miniaturized module in which multiple chips such as switches, RF filters, amplifiers, phase shifters, etc. are assembled together through 2D, 2.5D or 3D heterogeneous integration processes. It can also be a SoC single chip that integrates one or all of the circuits together, or it can be other product forms. However, no matter what form it is, the switch filtering circuit it contains is manufactured under the guidance of the RF front-end anti-interference filtering segmentation method described in any of the above items.

[0118] An optional embodiment of the present invention also provides an electronic device, comprising: one or more processors; a storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the electronic device implements the RF front-end anti-interference filtering segmentation method provided in the above-mentioned embodiments.

[0119] Figure 7 shows a schematic diagram of the structure of a computer system 700 of an electronic device suitable for implementing an embodiment of the present invention. It should be noted that the computer system 700 of an electronic device shown in Figure 7 is only an example and should not limit the functions and scope of use of the embodiment of the present invention.

[0120] As shown in Figure 7, computer system 700 includes a central processing unit (CPU) 701, which can perform various appropriate actions and processes according to the program stored in read-only memory (ROM) 702 or the program loaded from storage portion 708 into random access memory (RAM) 703, such as executing the method described in the above embodiment. Various programs and data required for system operation are also stored in RAM 703. CPU 701, ROM 702 and RAM 703 are connected to each other via bus 704. Input / output (I / O) interface 705 is also connected to bus 704.

[0121] The following components are connected to the I / O interface 705: an input section 706 including a keyboard, a mouse, and the like; an output section 707 including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and a speaker; a storage section 708 including a hard disk and the like; and a communication section 709 including a network interface card such as a LAN (Local Area Network) card or a modem. The communication section 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to the I / O interface 705 as needed. Removable media 711, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, is installed in the drive 710 as needed, so that computer programs read therefrom can be installed into the storage section 708 as needed.

[0122] In particular, according to an embodiment of the present invention, the process described above can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product that includes a computer program carried on a computer-readable medium, the computer program including a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 709 and / or installed from a removable medium 711. When the computer program is executed by the central processing unit (CPU) 701, the various functions defined in the system of the present invention are performed.

[0123] It should be noted that the computer-readable medium shown in the embodiments of the present invention may be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. The computer-readable storage medium may, for example, be an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or component, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to, an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable computer program. Such a propagated data signal may take a variety of forms, including, but not limited to, an electromagnetic signal, an optical signal, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. A computer program embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, or any suitable combination thereof.

[0124] An optional embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When executed by a processor, the computer program implements the aforementioned RF front-end anti-interference filtering segmentation method. The computer-readable storage medium may be included in the electronic device described in the above embodiment, or may exist independently and not be incorporated into the electronic device.

[0125] An optional embodiment of the present invention further provides a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the RF front-end anti-interference filtering segmentation method provided in each of the above embodiments.

[0126] To sum up, in the RF front-end anti-interference filtering segmentation method, RF front-end module, electronic device, computer-readable storage medium, computer program product or computer program provided by the present invention, based on the principle of minimizing the number of RF filters or maximizing the anti-interference capability, the working bandwidth, number and center frequency of the RF filter required for the switching filtering circuit are determined according to the RF working frequency band, and then the working parameters of the required RF filter can be flexibly designed according to the RF working frequency band to be covered, so as to achieve tailor-made filtering performance with optimal performance, improve the filtering accuracy, and reversely guide the design of the RF filter; secondly, when the working bandwidths of two RF filters with adjacent bandwidths in the switching filtering circuit have an overlapping area, for the RF working frequency point in the overlapping area, one of the two RF filters corresponding to the overlapping area is selected according to the different filtering requirements of the RF front end to perform anti-interference filtering on the RF working frequency point, which can effectively take into account other performance requirements of the RF front-end or electronic system while achieving high-precision filtering, and further realize directional and precise filtering.

[0127] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A radio frequency front-end anti-interference filtering segmentation method, characterized in that: include: Obtain the RF working frequency band to be covered by the RF front end, and determine the required working bandwidth, number and center frequency of the RF filters according to the RF working frequency band based on the principle of minimizing the number of RF filters or maximizing the anti-interference capability, so that the working bandwidth of the switch filter circuit formed by each of the RF filters at least covers each channel of the RF front end; When there is an overlapping area in the working bandwidths of two RF filters with adjacent bandwidths in the switching filter circuit, for the RF operating frequency point in the overlapping area, one of the two RF filters corresponding to the overlapping area is selected according to the parameter priority of the RF front-end to perform anti-interference filtering on the RF operating frequency point.

2. The RF front-end anti-interference filtering segmentation method according to claim 1 is characterized in that: The step of determining the required working bandwidth, quantity and center frequency of the radio frequency filter according to the radio frequency working frequency band includes: Based on the principle of minimizing the number of radio frequency filters, the operating bandwidth of each radio frequency filter is designed to be the maximum operating bandwidth; Obtain the starting frequency and the ending frequency of the RF working frequency band, and arrange the RF filters in sequence, so that the working bandwidth of each RF filter covers each channel of the RF front end and just continuously and completely covers the RF working frequency band from the starting frequency to the ending frequency, and the working bandwidths of two adjacent RF filters have the overlapping area, and the bandwidth of the overlapping area is the sum of the intermediate frequency signal bandwidth of the RF front end and the frequency drift value of the RF filter within the full temperature range; According to the arrangement and coverage of each of the RF filters, the number of the RF filters required to continuously and completely cover the RF operating frequency band from the starting frequency to the ending frequency is calculated, and the center frequency of each of the RF filters is calculated.

3. The RF front-end anti-interference filtering segmentation method according to claim 2 is characterized in that: The maximum operating bandwidth of the RF filter is greater than or equal to the sum of the intermediate frequency signal bandwidth of the RF front end, the frequency interval value between two adjacent channels, and the frequency drift value of the RF filter within the full temperature range.

4. The RF front-end anti-interference filtering segmentation method according to claim 1 is characterized in that: The step of determining the required working bandwidth, quantity and center frequency of the radio frequency filter according to the radio frequency working frequency band includes: Based on the principle of maximizing the anti-interference capability, the working bandwidth of each of the RF filters is designed to be a minimum working bandwidth, and the minimum working bandwidth that the RF filter can achieve is greater than the sum of the intermediate frequency signal bandwidth of the RF front end and the frequency drift value of the RF filter within the full temperature range; Obtain the starting frequency and the ending frequency of the radio frequency working frequency band, and arrange the radio frequency filters in sequence so that each The working bandwidth of each of the RF filters covers each channel of the RF front end and just continuously and completely covers the RF working frequency band from the starting frequency to the ending frequency, and the working bandwidths of two adjacent RF filters have the overlapping area, and the bandwidth of the overlapping area is the sum of the intermediate frequency signal bandwidth of the RF front end and the frequency drift value of the RF filter within the full temperature range; According to the arrangement and coverage of each of the RF filters, the number of the RF filters required to continuously and completely cover the RF operating frequency band from the starting frequency to the ending frequency is calculated, and the center frequency of each of the RF filters is calculated.

5. The RF front-end anti-interference filtering segmentation method according to claim 4 is characterized in that: When the minimum bandwidth that the RF filter can achieve is greater than the sum of the intermediate frequency signal bandwidth of the RF front end, the frequency interval value between two adjacent channels, and the frequency drift value of the RF filter within the full temperature range, the minimum operating bandwidth of the RF filter is designed to be the minimum bandwidth that the RF filter can achieve; when the minimum bandwidth that the RF filter can achieve is less than or equal to the sum of the intermediate frequency signal bandwidth of the RF front end, the frequency interval value between two adjacent channels, and the frequency drift value of the RF filter within the full temperature range, and is greater than the sum of the intermediate frequency signal bandwidth of the RF front end and the frequency drift value of the RF filter within the full temperature range, the minimum operating bandwidth of the RF filter is designed to be the sum of the intermediate frequency signal bandwidth of the RF front end, the frequency interval value between two adjacent channels, and the frequency drift value of the RF filter within the full temperature range.

6. The RF front-end anti-interference filtering segmentation method according to claim 1 is characterized in that: The step of determining the required working bandwidth, quantity and center frequency of the radio frequency filter according to the radio frequency working frequency band includes: Based on the principle of maximizing the anti-interference capability, the working bandwidth of each of the RF filters is designed to be the minimum working bandwidth, the minimum bandwidth that the RF filter can achieve is less than or equal to the sum of the intermediate frequency signal bandwidth of the RF front end and the frequency drift value of the RF filter within the full temperature range, and the minimum working bandwidth of the RF filter is designed to be the sum of the intermediate frequency signal bandwidth of the RF front end and the frequency drift value of the RF filter within the full temperature range, so that each of the RF filters can just perform frequency selection filtering on one channel within the RF working frequency band; Obtaining the starting frequency and the ending frequency of the RF working frequency band, and sequentially arranging the RF filters so that the working bandwidth of each RF filter is just discretely and discontinuously distributed from the starting frequency to the ending frequency and covers each channel of the RF front end, and there is no overlapping area between the working bandwidths of two adjacent RF filters; According to the arrangement and coverage of each of the RF filters, the number of the RF filters required to be discretely and discontinuously distributed from the starting frequency to the ending frequency and cover each channel of the RF front end is calculated, and the center frequency of each of the RF filters is calculated. The number of the RF filters is the same as the number of the channels. The center frequency of the filter is the same as the RF operating frequency of the channel.

7. The RF front-end anti-interference filtering segmentation method according to claim 1, characterized in that: The step of selecting one of the two RF filters corresponding to the overlapping area to perform anti-interference filtering on the RF operating frequency point in the overlapping area according to the parameter priority of the RF front end includes: Determining the boundary operating frequency point of the overlapping area according to the parameter priority of the radio frequency front end; Compare the performance of the RF front end at the RF operating frequency with the performance at the boundary operating frequency, and select one of the two RF filters corresponding to the overlapping area to perform anti-interference filtering on the RF operating frequency according to the comparison result.

8. The RF front-end anti-interference filtering segmentation method according to claim 7, characterized in that: The step of determining the boundary operating frequency point of the overlapping area according to the parameter priority of the radio frequency front end includes: Designing a sliding window, wherein the center frequency of the sliding window is the frequency point in the overlapping area, and the frequency width of the sliding window is the intermediate frequency signal bandwidth of the RF front end; With signal amplitude as priority, in the overlapping region, the sliding window is gradually slid from the minimum value of the frequency point to the maximum value of the frequency point, and the center frequency of the sliding window when the absolute value of the difference in amplitude flatness of the two RF filters within the frequency range of the sliding window reaches the minimum is the boundary working frequency point; or with signal phase as priority, in the overlapping region, the sliding window is gradually slid from the minimum value of the frequency point to the maximum value of the frequency point, and the center frequency of the sliding window when the absolute value of the difference in phase linearity of the two RF filters within the frequency range of the sliding window reaches the minimum is the boundary working frequency point; or with signal delay as priority, in the overlapping region, the sliding window is gradually slid from the minimum value of the frequency point to the maximum value of the frequency point, and the center frequency of the sliding window when the absolute value of the difference in group delay fluctuation of the two RF filters within the frequency range of the sliding window reaches the minimum is the boundary working frequency point; Among them, in the two radio frequency filters corresponding to the overlapping area, the center frequency of the former radio frequency filter is lower than the center frequency of the latter radio frequency filter.

9. An electronic device, characterized in that: include: one or more processors; A storage device for storing one or more programs, when the one or more programs are executed by the one or more processors, enables the electronic device to implement the RF front-end anti-interference filtering segmentation method as described in any one of claims 1 to 8.

10. A radio frequency front-end module, characterized in that: It comprises a switching filter circuit manufactured under the guidance of the radio frequency front-end anti-interference filtering segmentation method described in any one of claims 1 to 8.

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