CN112865738B - Radio frequency receiving module, method for improving performance of radio frequency receiving module and communication equipment - Google Patents
Radio frequency receiving module, method for improving performance of radio frequency receiving module and communication equipment Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention provides a radio frequency receiving module, a method for improving the performance of the radio frequency receiving module and communication equipment, which are beneficial to improving the performance of the radio frequency receiving module. The invention relates to a radio frequency receiving module, which comprises an active module, wherein the input end and the output end of the active module are respectively connected with 1 or more pre-stage filters and 1 or more post-stage filters, the pre-stage filters and the post-stage filters are acoustic wave filters, and at least one pre-stage filter and one post-stage filter meet one or more of the following conditions: the stage number of the front stage filter is smaller than that of the rear stage filter; the serial-parallel average area ratio of the preceding filter is larger than that of the subsequent filter; the matching inductance of the front-stage filter is different from that of the rear-stage filter; the out-of-band zero position of the front-stage filter is different from the out-of-band zero position of the rear-stage filter.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a radio frequency receiving module, a method for improving performance of the radio frequency receiving module, and a communication device.
Background
The recent trend toward miniaturization and high performance of communication devices has been increasing, posing even greater challenges to rf front-ends. In the radio frequency communication front end, miniaturization is realized by reducing the sizes of a chip and a packaging substrate on one hand, and better performance is realized by reducing loss sources and better resonator matching design on the other hand. In the existing filter structure, more passive devices are used for matching, and meanwhile, more structures such as inductors, capacitors, couplings and the like are additionally introduced for improving specific performances such as roll-off insertion loss and the like.
A typical structure of a general filter is shown in fig. 1, and fig. 1 is a schematic view of a structure of an acoustic wave filter according to the related art. In this filter 10, an input matching inductor 121, an output matching inductor 122, and a plurality of acoustic wave resonators (generally referred to as series resonators) 101 to 104 are provided between an input terminal 131 and an output terminal 132, and resonators 111 to 113 (generally referred to as parallel resonators) and ground inductors 123 to 125 are provided in a plurality of branches (generally referred to as parallel branches) between a connection point of each series resonator and a ground terminal. In the duplexer, the ground inductances of the preceding stage filter and the subsequent stage filter are not necessarily identical, but the ground inductances at the same positions between the preceding stage filter and the subsequent stage filter are also identical, for example, the ground inductances at the second stage are identical. In the duplexer, the input matching inductances of the preceding filter and the subsequent filter are the same, and the output matching inductances are the same.
Fig. 2 is a schematic diagram of a basic structure of an rf receiving module in an rf receiving system according to the prior art, in which the filter 21 and the filter 22 are a front-stage filter and a rear-stage filter, respectively, and both use the same chip, i.e. topology, matching mode, and the resonators inside the filters are arranged in the same manner. Where the LNA is between the filter 21 and the filter 22, a low noise amplifier LNA, where other active blocks may also be provided. The number of the preceding stage filter and the following stage filter may be 1 as shown in the figure, or may be plural.
The filter 21 and the filter 22 may adopt a ladder structure as shown in fig. 1. Fig. 1 shows a 4-3 structure, i.e. 4 series resonators and 3 parallel resonators, in the order of 7 (4 +3= 7). The filter 21 and the filter 22 are used for filtering out signals with non-target frequencies, avoiding interference between signals and ensuring the quality of received signals. The introduction of the filter will increase additional insertion loss and corresponding noise (in the filter, insertion loss is the most dominant source of noise), so that it is ensured that the out-of-band rejection requirement is met, and at the same time, it is important to reduce the introduction of noise as much as possible for the system performance of the receiving module.
Disclosure of Invention
In view of this, the present invention provides a radio frequency receiving module, a method for improving performance thereof, and a communication device, which are helpful for improving performance of the radio frequency receiving module. The invention provides the following technical scheme:
a radio frequency receiving module comprises an active module, wherein the input end and the output end of the active module are respectively connected with 1 or more pre-stage filters and 1 or more post-stage filters, the pre-stage filters and the post-stage filters are acoustic wave filters, and at least one pre-stage filter and one post-stage filter meet one or more of the following conditions: the order of the front-stage filter is smaller than that of the rear-stage filter; the serial-parallel average area ratio of the front-stage filter is larger than that of the rear-stage filter; the matching inductance of the front-stage filter is different from that of the rear-stage filter; the out-of-band zero position of the front-stage filter is different from the out-of-band zero position of the rear-stage filter.
Optionally, the active module is a low noise amplifier.
Optionally, the one pre-stage filter and the one post-stage filter conform to at least one of: the series resonance frequencies are different; the parallel resonance frequencies are different; the input matching inductances are different; the output matching inductances are different; the areas of the series resonators are different; the areas of the parallel resonators are different; the ground inductances being the same in position are different; the laminated structure is different, and the laminated structure is formed by a plurality of metal layers forming a resonator, and the distribution of a plurality of layers of structures such as a piezoelectric layer and a non-metal layer in the horizontal direction and the vertical direction; the material properties of the respective laminated structures are different, and include electrical parameters such as conductivity, dielectric constant, and the like, and physical parameters such as density, ductility, and the like of metals, non-metals, piezoelectric materials, and the like constituting the respective layers of the resonator.
A method of improving the performance of a radio frequency receive module comprising an active module having an input and an output respectively connected to 1 or more pre-filters and 1 or more post-filters, the pre-and post-filters being acoustic filters, the method comprising adapting at least one of the pre-and post-filters to one or more of: the stage number of the front stage filter is smaller than that of the rear stage filter; the serial-parallel average area ratio of the front-stage filter is larger than that of the rear-stage filter; the matching inductance of the front-stage filter is different from that of the rear-stage filter; the out-of-band zero position of the front-stage filter is different from the out-of-band zero position of the rear-stage filter.
Optionally, the active module is a low noise amplifier.
Optionally, the one pre-stage filter and the one post-stage filter conform to at least one of: the series resonance frequencies are different; the parallel resonance frequencies are different; the input matching inductances are different; the output matching inductances are different; the ground inductance is different; the area of the series resonators is different; the areas of the parallel resonators are different; the ground inductances being the same in position are different; the laminated structures are different; the material properties of each laminated structure are different.
A communication device comprises the radio frequency receiving module.
According to the technical scheme of the invention, the structure of the front filter and the rear filter of the radio frequency receiving module has a plurality of specific measures, and the measures can be used independently or in combination, thereby being beneficial to improving the performance of the radio frequency receiving module.
Drawings
For purposes of illustration and not limitation, the present invention will now be described in accordance with its preferred embodiments, particularly with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram of one structure of an acoustic wave filter according to the prior art;
fig. 2 is a schematic diagram of a basic structure of an rf receiving module in an rf receiving system according to the prior art;
fig. 3A and 3B are schematic diagrams of topologies of a pre-stage filter according to an embodiment of the present invention, respectively;
FIGS. 4A and 4B are schematic diagrams of echo changes according to embodiments of the present invention;
fig. 5 is a schematic diagram of the improvement effect on out-of-band rejection due to the difference in the zero positions of the front and rear stage filters according to the embodiment of the present invention.
Detailed Description
In a radio frequency system, the noise introduced by the front stage and the back stage has different noise contributions to the whole system, and the noise contribution of the front stage to the whole system is far larger than that of the back stage (because the middle active module attenuates the back stage noise). In the existing receiving module, the front stage and the rear stage adopt the same filter, and under the condition of ensuring certain out-of-band rejection, the system noise is poor. And the same filter is adopted, the whole out-of-band zero point is superposed, so that the specific frequency position is well inhibited, most of the specific frequency position is relatively poor in inhibition, and the whole out-of-band inhibition is difficult to ensure. In addition, the same filter setting does not have flexible adjustment on the echo, and better echo performance is difficult to ensure.
The embodiment of the invention provides that differences are formed among the topological structures, the resonator characteristics, the matching modes and the like of filters arranged at the front stage and the rear stage so as to improve the performance indexes of the whole radio frequency module, such as noise, matching performance, out-of-band rejection and the like. Taking the example of 1 filter in each of the front and rear stages, if the duplexer includes a plurality of front stage filters and rear stage filters, at least one front stage filter and one rear stage filter form the above difference.
Fig. 3A and 3B are schematic diagrams of topologies of a pre-stage filter according to an embodiment of the present invention, respectively. In fig. 3A and 3B, the number of stages of the preceding stage filter and the following stage filter is made different, and the number of stages of the preceding stage filter is 5 stages and is smaller than the number of stages of the following stage filter (9 stages). The noise factor of the cascade system is: f = F1+ (F2-1)/G1 + (F3-1)/G1/G2. Wherein F is the total noise factor of the system, F1-F3 are the noise factors of the front filter, LNA (or other active modules) and the rear filter respectively, and G1 and G2 are the gains of the front filter and the LNA. The front-stage filter does not generate gain and has insertion loss, so G1 is less than 1; the LNA has a certain gain (G2 is much larger than 1, and the specific G2 value is related to the gain size); the noise contribution of the post-filter to the system is almost negligible. Therefore, when designing the filter, the insertion loss of the preceding filter is improved (i.e. the noise is reduced), but at the same time, the out-of-band rejection is deteriorated; the insertion loss of the post-stage filter is deteriorated, but the suppression is improved at the same time, so that the system noise is improved while ensuring that the total suppression is not changed. In fig. 3A, because the number of stages is small, the loss is small, so the insertion loss performance is better, that is, the introduced noise is small, but the corresponding out-of-band rejection is poor; in fig. 3B, the number of stages is small, so that the loss is large, and the insertion loss is worse, so that the introduced noise is large, but the corresponding out-of-band rejection is good; the overall out-of-band rejection level of the two filter cascades of fig. 3A and 3B is unchanged, but the overall noise is improved.
In the embodiment of the present invention, another measure is to set the serial-to-parallel average area ratio of the preceding stage filter to be larger than that of the following stage filter. For the quotient A obtained by dividing the total area of all the series resonators by the number of the series resonators and the quotient B obtained by dividing the total area of all the parallel resonators by the number of the parallel resonators, the ratio of A to B is the serial-to-parallel average area ratio herein. The larger the series-parallel average area ratio, the better the corresponding filter insertion loss, and the worse the corresponding out-of-band rejection. Therefore, the series-parallel average area ratio of the preceding filter is made larger than that of the subsequent filter, so that the system noise is better, and the degradation of the out-of-band rejection is avoided as much as possible.
In the embodiment of the present invention, another measure is to set the input and output matching inductances of the front and rear filters to be different. In the same filter, the input and output matching inductances are the same, but the matching inductances of the preceding and following filters are different. Fig. 4A and 4B are schematic diagrams illustrating echo changes according to an embodiment of the present invention, where fig. 4A is S11 and fig. 4B is S22. As can be seen from the figure, the input and output matching inductances of the filters in the front and rear stages are different, which contributes to the improvement of the echo.
In an embodiment of the invention, a further measure is to make the out-of-band zeros of the front and back filters different. Therefore, the series resonance frequency Fs of the front and rear filters may be different, and the parallel resonance frequency Fp of the front and rear filters may be different. Further, the matching inductance or ground inductance of the front and rear filters may be different, the area of the series resonators of the front and rear filters may be different, or the area of the parallel resonators may be different. One or more of these approaches may be used in combination in an implementation, and all may make the out-of-band zeros of the front and back filters different. Fig. 5 is a schematic diagram illustrating the improvement effect on out-of-band rejection due to the difference in the zero positions of the post-and-post filters according to the embodiment of the present invention. The thin line in the figure is the curve of out-of-band rejection for the same zero of the preceding and following filters. The bold line is a curve of the out-of-band rejection when the zero points of the front and rear stage filters are different, and it can be seen that the above mode has a significant improvement on the out-of-band rejection.
The above-mentioned measures can be used alone or in combination, and all contribute to improving the performance of the rf receiving module. The radio frequency receiving module is applied to communication equipment and is also beneficial to improving the performance of the communication equipment.
The above-described embodiments should not be construed as limiting the scope of the invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions can occur, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A radio frequency receiving module comprises an active module, wherein the input end and the output end of the active module are respectively connected with 1 or more pre-stage filters and 1 or more post-stage filters, the pre-stage filters and the post-stage filters are acoustic wave filters, and at least one pre-stage filter and one post-stage filter meet one or more of the following conditions:
the order of the front-stage filter is smaller than that of the rear-stage filter;
the serial-parallel average area ratio of the front-stage filter is larger than that of the rear-stage filter;
the matching inductance of the front-stage filter is different from that of the rear-stage filter;
the out-of-band zero position of the front-stage filter is different from the out-of-band zero position of the rear-stage filter.
2. The rf receiving module of claim 1, wherein the active module is a low noise amplifier.
3. The rf receive module of claim 1, wherein the one pre-filter and the one post-filter conform to at least one of:
the series resonance frequencies are different;
the parallel resonance frequencies are different;
the input matching inductances are different;
the output matching inductances are different;
the areas of the series resonators are different;
the areas of the parallel resonators are different;
the ground inductances being the same in position are different;
the laminated structures are different;
the material properties of each laminated structure are different.
4. A method of improving the performance of a radio frequency receive module comprising an active module having an input and an output respectively connected to 1 or more pre-filters and 1 or more post-filters, the pre-and post-filters being acoustic filters, the method comprising adapting at least one of the pre-and post-filters to one or more of:
the stage number of the front stage filter is smaller than that of the rear stage filter;
the serial-parallel average area ratio of the front-stage filter is larger than that of the rear-stage filter;
the matching inductance of the front-stage filter is different from that of the rear-stage filter;
the out-of-band zero position of the front-stage filter is different from the out-of-band zero position of the rear-stage filter.
5. The method of claim 4, wherein the active module is a low noise amplifier.
6. The method of claim 4, wherein the one pre-stage filter and the one post-stage filter are in accordance with at least one of:
the series resonance frequencies are different;
the parallel resonance frequencies are different;
the input matching inductances are different;
the output matching inductances are different;
different ground inductances;
the areas of the series resonators are different;
the areas of the parallel resonators are different;
the ground inductances being the same in position are different;
the laminated structure is different;
the material properties of each laminated structure are different.
7. A communication device comprising the rf receiving module of any one of claims 1 to 3.
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