CN116582149B - Radio frequency TRX intermediate frequency filter multiplexing circuit and WiFi radio frequency chip - Google Patents
Radio frequency TRX intermediate frequency filter multiplexing circuit and WiFi radio frequency chip Download PDFInfo
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- CN116582149B CN116582149B CN202310841152.3A CN202310841152A CN116582149B CN 116582149 B CN116582149 B CN 116582149B CN 202310841152 A CN202310841152 A CN 202310841152A CN 116582149 B CN116582149 B CN 116582149B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0283—Filters characterised by the filter structure
- H03H17/0286—Combinations of filter structures
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- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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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
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention belongs to the technical field of WiFi chip circuits, and discloses a radio frequency TRX intermediate frequency filter multiplexing circuit and a WiFi radio frequency chip, wherein the radio frequency TRX intermediate frequency filter multiplexing circuit comprises at least one receiving intermediate frequency filter, at least one public multiplexing intermediate frequency filter and a plurality of change-over switches; the selective switching of the receiving intermediate frequency filter and the public multiplexing intermediate frequency filter under the two modes of the TX mode and the RX mode is realized through the open or closed states of a plurality of switching switches; and switching and selecting a common multiplexing intermediate frequency filter in a TX mode, and switching and selecting a cascade of a receiving intermediate frequency filter and the common multiplexing intermediate frequency filter in an RX mode. The invention reduces the order of the filter actually designed in the link by multiplexing the same filter through switching the switch, thereby reducing the area of the chip, and especially having more obvious optimizing effect in the chip with more channels.
Description
Technical Field
The invention relates to a multiplexing circuit of a radio frequency TRX intermediate frequency filter, and belongs to the technical field of wifi chip circuits.
Background
WiFi networks have been spread throughout the various places of people's life and work. As an important core of the WiFi router, the performance of the WiFi chip determines the stability of the WiFi network and the maximum uplink and downlink speed; the area and power consumption of the chip design itself are also the core of its competitiveness, and are also the key factors in determining router cost.
The traditional architecture of the WiFi radio frequency chip is that a TX transmitting link, an RX receiving link and an LO local oscillator link are independent links.
The RX receiving link comprises main modules such as a low noise amplifier LNA, a transconductance amplifier gm, a down Mixer Mixer, a transimpedance amplifier TIA, a low-pass intermediate frequency filter LPF, an intermediate frequency amplifier VGA, an ADC and the like, and mainly completes the signal receiving work.
The TX transmitting chain comprises a power amplifier PA, a pre-amplifier PPA, an up-Mixer Mixer, a low-pass intermediate frequency filter LPF, a DAC and other main modules, and mainly completes signal transmitting work.
How to design and change the traditional architecture of the WiFi chip, and optimizing the area and the power consumption are important considerations of designers.
Disclosure of Invention
The invention aims to provide a multiplexing circuit of a radio frequency TRX intermediate frequency filter, which aims to optimize the area of a radio frequency chip and reduce the chip cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
a multiplexing circuit of a radio frequency TRX intermediate frequency filter comprises at least one receiving intermediate frequency filter, at least one public multiplexing intermediate frequency filter and a plurality of change-over switches; the selective switching of the receiving intermediate frequency filter and the public multiplexing intermediate frequency filter under the two modes of the TX mode and the RX mode is realized through the open or closed states of a plurality of switching switches; wherein, the switching selects the public multiplexing intermediate frequency filter in TX mode, and the switching selects the cascade connection of the receiving intermediate frequency filter and the public multiplexing intermediate frequency filter in RX mode.
Further, the receiving intermediate frequency filter is a filter which meets the design order of the RX mode performance after being cascaded with the common multiplexing intermediate frequency filter, and the order is the difference order between the filter order required by the RX mode and the filter order required by the TX mode.
Further, the common multiplexing intermediate frequency filter is a filter which meets the design order of RX mode performance after being cascaded with the receiving intermediate frequency filter, and the order is the filter order required by TX mode.
Further, the plurality of switches includes a second switch, a third switch, a fourth switch, and a sixth switch; the first end of the public multiplexing intermediate frequency filter is connected with the RX link input point through the second change-over switch, the second end of the public multiplexing intermediate frequency filter is connected with the first end of the receiving intermediate frequency filter through the third change-over switch, and the second end of the receiving intermediate frequency filter is connected with the RX link output point; meanwhile, the first end of the common multiplexing intermediate frequency filter is also connected to the TX link input point through a sixth change-over switch, and the second end of the common multiplexing intermediate frequency filter is also connected to the TX link output point through a fourth change-over switch.
Further, in the RX mode, the fourth and sixth switches are opened, the second and third switches are closed, and cascading of the common multiplexing intermediate frequency filter and the receiving intermediate frequency filter is realized, wherein the common multiplexing intermediate frequency filter is a first-stage filter, and the receiving intermediate frequency filter is a second-stage filter; in TX mode, the second and third switches are opened, and the fourth and sixth switches are closed.
Further, the plurality of switches includes an eighth switch, a ninth switch, a fourth switch, and a sixth switch; the first end of the receiving intermediate frequency filter is connected with an RX link input point, the second end of the receiving intermediate frequency filter is connected with the first end of the public multiplexing intermediate frequency filter through an eighth change-over switch, and the second end of the public multiplexing intermediate frequency filter is connected with an RX link output point through a ninth change-over switch; meanwhile, the first end of the common multiplexing intermediate frequency filter is also connected to the TX link input point through a sixth change-over switch, and the second end of the common multiplexing intermediate frequency filter is also connected to the TX link output point through a fourth change-over switch.
Further, in the RX mode, the fourth switch and the sixth switch are opened, the eighth switch and the ninth switch are closed, and cascading of the receiving intermediate frequency filter and the public multiplexing intermediate frequency filter is realized, wherein the receiving intermediate frequency filter is a first-stage filter, and the public multiplexing intermediate frequency filter is a second-stage RX filter; in TX mode, the eighth and ninth switches are opened, and the fourth and sixth switches are closed.
Further, the plurality of switches includes a second switch, a third switch, a fourth switch, a sixth switch, a seventh switch, an eighth switch, and a ninth switch; the first end of the public multiplexing intermediate frequency filter is connected with an RX link input point through a second change-over switch, the second end of the public multiplexing intermediate frequency filter is connected with the first end of the receiving intermediate frequency filter through a third change-over switch, the second end of the receiving intermediate frequency filter is connected with an RX link output point through an eighth change-over switch, and meanwhile, the second end of the receiving intermediate frequency filter is connected with the first end of the public multiplexing intermediate frequency filter through an eighth change-over switch; meanwhile, a first end of the receiving intermediate frequency filter is connected to an RX link input point through a seventh change-over switch, and a second end of the common multiplexing intermediate frequency filter is connected with an RX link output point through a ninth change-over switch; the first end of the common multiplexing intermediate frequency filter is also connected with the TX link input point through a sixth change-over switch, and the second end of the common multiplexing intermediate frequency filter is also connected with the TX link output point through a fourth change-over switch.
Further, in the RX mode, a switching mode that a fourth switch, a sixth switch, a seventh switch, an eighth switch and a ninth switch are opened, and a second switch, a third switch and an eighth switch are closed, or a switching mode that the fourth switch, the sixth switch, the second switch, the third switch and the eighth switch are opened, and a seventh switch, the eighth switch and the ninth switch are closed is adopted to realize cascade connection of the receiving intermediate frequency filter and the common multiplexing intermediate frequency filter; in TX mode, the fourth and sixth switches are closed, and the rest switches are opened.
A WiFi radio frequency chip employing a radio frequency TRX intermediate frequency filter multiplexing circuit as described in any of the preceding claims.
The invention has the beneficial effects that:
according to the circuit design framework for LPF multiplexing in the radio frequency TRX circuit, the common required order of the intermediate frequency filters of the TX and RX links is optimized, the same filter is multiplexed by switching the intermediate frequency switches, and the order of the actually designed filter in the link is reduced, so that the area of a chip is reduced, and the optimization effect is more obvious especially in chips with more channels.
Drawings
Fig. 1 is a schematic diagram of a WiFi radio frequency chip employing a LPF multiplexing circuit in a radio frequency TRX circuit;
fig. 2 is a schematic diagram of a multiplexing circuit design of a rf TRX intermediate frequency filter according to embodiment 1 of the present invention;
fig. 3 is a schematic diagram of a multiplexing circuit design of a rf TRX intermediate frequency filter according to embodiment 2 of the present invention;
fig. 4 is a schematic diagram showing the switching of the rf TRX intermediate frequency filter multiplexing circuit according to embodiment 2 of the present invention to an RX mode;
fig. 5 is a schematic diagram showing the switching of the rf TRX intermediate frequency filter multiplexing circuit according to embodiments 2 and 3 to TX mode;
fig. 6 is a schematic diagram of a multiplexing circuit design of a rf TRX intermediate frequency filter according to embodiment 3 of the present invention;
fig. 7 is a schematic diagram showing the switching of the rf TRX intermediate frequency filter multiplexing circuit according to embodiment 3 of the present invention to an RX mode;
reference numerals illustrate:
10. RX receiving link
20. TX transmitting link
30. LO local oscillator link
100. Multiplexing filter module
110. Receiving intermediate frequency filter
120. Second change-over switch
130. Third change-over switch
140. Fourth change-over switch
150. Common multiplexing intermediate frequency filter
160. Sixth change-over switch
170. Seventh change-over switch
180. Eighth change-over switch
181. Eighth switch
190. And a ninth changeover switch.
Detailed Description
The present invention will be further described with reference to the accompanying drawings for the purpose of illustrating in detail the technical contents, construction features, achieved objects and effects of the technical solution. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 2, the rf TRX intermediate frequency filter multiplexing circuit in this embodiment includes a multiplexing filter module 100, where the multiplexing filter module 100 includes a receiving intermediate frequency filter 110, a common multiplexing intermediate frequency filter 150, and a plurality of switches. The plurality of change-over switches are used for keeping an open or closed state under the two modes of the TX mode and the RX mode, so that the selection and the switching of the multiplexing intermediate frequency filter are realized. Wherein the TX mode uses only the common multiplexing intermediate frequency filter 150, and the RX mode requires the cascade of the receiving intermediate frequency filter 110 and the common multiplexing intermediate frequency filter 150 to achieve an order design that satisfies the original RX filter performance.
The receive intermediate frequency filter 110 and the common multiplex intermediate frequency filter 150 are intermediate frequency filters.
The receiving intermediate frequency filter 110 is used in the RX mode, and the order of the receiving intermediate frequency filter is the difference between the required order of the RX mode and the required order of the TX mode, and is a filter cascaded with the common multiplexing intermediate frequency filter 150 to satisfy the design order of the RX mode performance.
The common intermediate frequency filter 150 is an intermediate frequency filter multiplexed in the RX mode and in the TX mode, and has an order of TX mode requirement, and is a filter cascaded with the receiving intermediate frequency filter 110 to satisfy the design order of the RX mode performance.
The common required order of the intermediate frequency filters of the TX and RX links is optimized, and the order of the filters actually designed in the links is reduced by multiplexing the same filters through a change-over switch, so that the area of a chip is reduced, and the optimization effect is obvious especially in chips with more channels.
For example, the RX mode of the original design architecture is a 4-order filter, the TX mode is a 2-order filter, the design area of the total 6-order filter is reduced, the receiving intermediate frequency filter 110 can be designed to be a 2-order filter by reasonably distributing design parameters, the common multiplexing intermediate frequency filter 150 is a 2-order filter, and the total 4-order filter multiplexing circuit is further reduced by the design area of the two-order filter compared with the original design architecture 6-order filter.
In the RX mode, the 2-order receiving intermediate frequency filter 110 and the 2-order common multiplexing intermediate frequency filter 150 are cascaded to form a 4-order filter through the switching of the switching switch, and in the TX mode, the switching of the switching switch only reaches the 2-order filter through the 2-order common multiplexing intermediate frequency filter 150, so that the selection and switching of the multiplexing intermediate frequency filter are realized.
In other embodiments, the receiving intermediate frequency filter 110 may be cascaded by two or more filters.
Similarly, the common multiplexed intermediate frequency filter 150 may be a cascade of two or more filters.
In the present embodiment, the plurality of switches includes a second switch 120, a third switch 130, a fourth switch 140, a sixth switch 160, a seventh switch 170, an eighth switch 180, an eighth switch 181, and a ninth switch 190. The RX link input point is connected to the first end of the common multiplexing intermediate frequency filter 150 through the second switch 120, the second end of the common multiplexing intermediate frequency filter 150 is connected to the first end of the receiving intermediate frequency filter 110 through the third switch 130, the second end of the receiving intermediate frequency filter 110 is connected to the RX link output point through the eighth switch 181, and at the same time, the second end of the receiving intermediate frequency filter 110 is connected to the first end of the common multiplexing intermediate frequency filter 150 through the eighth switch 180; the RX link input point is simultaneously connected to the first end of the receiving intermediate frequency filter 110 via the seventh switch 170; a second terminal of the common multiplex intermediate frequency filter 150 is simultaneously connected to the RX link output point via a ninth switch 190. The first end of the common multiplexing intermediate frequency filter 150 is further connected to the TX link input point via a sixth switch 160, and the second end of the common multiplexing intermediate frequency filter 150 is further connected to the TX link output point via a fourth switch 140.
This connection can be switched according to the RX mode requirement.
The first switching mode is: first through the common multiplex intermediate frequency filter 150 and then through the receive intermediate frequency filter 110. The fourth switch 140, the sixth switch 160, the seventh switch 170, the eighth switch 180, and the ninth switch 190 are opened to ensure that no influence is caused to other branches, and the second switch 120, the third switch 130, and the eighth switch 181 are closed, so as to finally realize a cascade effect of the common multiplexing intermediate frequency filter 150 and the receiving intermediate frequency filter 110, where the common multiplexing intermediate frequency filter 150 is a first stage filter, and the receiving intermediate frequency filter 110 is a second stage filter.
The second switching mode is as follows: first through the receive intermediate frequency filter 110 and then through the common multiplex intermediate frequency filter 150. The fourth switch 140, the sixth switch 160, the second switch 120, the third switch 130, and the eighth switch 181 are opened to ensure that no influence is caused to other branches, and the seventh switch 170, the eighth switch 180, and the ninth switch 190 are closed, so as to finally realize a cascading effect of the receiving intermediate frequency filter 110 and the common multiplexing intermediate frequency filter 150, where the receiving intermediate frequency filter 110 is a first stage filter, and the common multiplexing intermediate frequency filter 150 is a second stage RX filter.
In TX mode, the switching implementation manner is that the second switch 120, the third switch 130, the seventh switch 170, the eighth switch 180, the eighth switch 181, and the ninth switch 190 are opened to ensure that no influence is generated on other branches, and the fourth switch 140 and the sixth switch 160 are closed, so as to finally achieve the purpose that the TX link only uses the common multiplexing intermediate frequency filter 150.
The multiplexing circuit of the radio frequency TRX intermediate frequency filter changes the structure that the existing TX transmitting link and the existing RX receiving link work independently and have no coupling relation, so that the transmitting link and the receiving link exchange the multiplexing filter, the chip area is reduced, and the chip cost is reduced.
Example 2
On the basis of embodiment 1, the switch in the multiplexing filter module 100 of fig. 2 is simplified in this embodiment, and a different switch from embodiment 1 is adopted, as shown in fig. 3, which is a circuit diagram of an embodiment of the multiplexing filter module 100 of the rf TRX intermediate frequency filter multiplexing circuit. In this embodiment, the connection relationship between the plurality of switches and the receiving intermediate frequency filter 110 and the common multiplexing intermediate frequency filter 150 is different from that of embodiment 1, so that the cascade effect of the receiving intermediate frequency filter 110 and the common multiplexing intermediate frequency filter 150 is realized by different switching modes in the RX mode. The remainder was the same as in example 1.
As specifically described in connection with fig. 3, the switches include a second switch 120, a third switch 130, a fourth switch 140, and a sixth switch 160. The RX link input point is connected to the first end of the common multiplexing intermediate frequency filter 150 through the second switch 120, the second end of the common multiplexing intermediate frequency filter 150 is connected to the first end of the receiving intermediate frequency filter 110 through the third switch 130, and the second end of the receiving intermediate frequency filter 110 is connected to the RX link output point. Meanwhile, the first end of the common multiplexing intermediate frequency filter 150 is further connected to the TX link input point via the sixth switch 160, and the second end of the common multiplexing intermediate frequency filter 150 is further connected to the TX link output point via the fourth switch 140.
The switching mode realized by the connection mode according to the RX mode requirement is as follows: first through the common multiplex intermediate frequency filter 150 and then through the receive intermediate frequency filter 110. As shown in fig. 4, in the RX mode, the multiplexing circuit is switched to be implemented by opening the fourth switch 140 and the sixth switch 160 to ensure that no influence is exerted on other branches, and closing the second switch 120 and the third switch 130, so as to finally achieve the cascade effect of the common multiplexing intermediate frequency filter 150 and the receiving intermediate frequency filter 110, where the common multiplexing intermediate frequency filter 150 is a first stage filter, and the receiving intermediate frequency filter 110 is a second stage filter.
Fig. 5 shows the final switching effect of the multiplexing circuit in TX mode, in which the second switch 120 and the third switch 130 are opened to ensure that no influence is exerted on other branches, and the fourth switch 140 and the sixth switch 160 are closed, so as to finally achieve the purpose that the TX link only uses the common multiplexing intermediate frequency filter 150.
According to the technical scheme, the common required order of the intermediate frequency filters of the TX and RX links is optimized, the same filter is multiplexed by switching through the change-over switch, so that the order of the actually designed filter in the link is reduced, the area of a chip is reduced, and the optimization effect is obvious especially in chips with more channels.
Example 3
On the basis of embodiment 1, the switch in the multiplexing filter module 100 of fig. 2 is simplified in this embodiment, and a different switch from embodiment 1 is adopted, as shown in fig. 6, which is a circuit diagram of an embodiment of the multiplexing filter module 100 of the rf TRX intermediate frequency filter multiplexing circuit. In this embodiment, the connection relationship between the plurality of switches and the receiving intermediate frequency filter 110 and the common multiplexing intermediate frequency filter 150 is different from that of embodiment 1, so that the cascade effect of the receiving intermediate frequency filter 110 and the common multiplexing intermediate frequency filter 150 is realized by different switching modes in the RX mode. The remainder was the same as in example 1.
As specifically described in connection with fig. 6, the switches include an eighth switch 180, a ninth switch 190, a fourth switch 140, and a sixth switch 160. The RX link input point is connected to a first end of the receiving intermediate frequency filter 110, a second end of the receiving intermediate frequency filter 110 is connected to a first end of the common multiplexing intermediate frequency filter 150 via an eighth switch 180, and a second end of the common multiplexing intermediate frequency filter 150 is connected to the RX link output point via a ninth switch 190. Meanwhile, the first end of the common multiplexing intermediate frequency filter 150 is further connected to the TX link input point via the sixth switch 160, and the second end of the common multiplexing intermediate frequency filter 150 is further connected to the TX link output point via the fourth switch 140.
The switching mode realized by the connection mode according to the RX mode requirement is as follows: first through the receive intermediate frequency filter 110 and then through the common multiplex intermediate frequency filter 150. As shown in fig. 7, in the RX mode, the multiplexing circuit is switched to be implemented by opening the fourth switch 140 and the sixth switch 160 to ensure that no influence is exerted on other branches, and closing the eighth switch 180 and the ninth switch 190, the cascade effect of the receiving intermediate frequency filter 110 and the common multiplexing intermediate frequency filter 150 is finally achieved, where the receiving intermediate frequency filter 110 is a first stage filter, and the common multiplexing intermediate frequency filter 150 is a second stage RX filter.
Fig. 5 shows the final switching effect of the multiplexing circuit in TX mode, in which the eighth switch 180 and the ninth switch 190 are opened to ensure that no influence is exerted on other branches, and the fourth switch 140 and the sixth switch 160 are closed, so as to finally achieve the purpose that the TX link only uses the common multiplexing intermediate frequency filter 150.
The two connection modes of the embodiment 2 and the embodiment 3 have some differences in radio frequency index requirements of input and output OP1dB (1 dB compression point), OIP3 (three-time interception point output by an amplifier) and the like of the two-stage filter, and are selected according to actual design capability and requirements.
According to the technical scheme, the common required order of the intermediate frequency filters of the TX and RX links is optimized, the same filter is multiplexed by switching through the change-over switch, so that the order of the actually designed filter in the link is reduced, the area of a chip is reduced, and the optimization effect is obvious especially in chips with more channels.
Example 4
As shown in fig. 1, the WiFi radio frequency chip includes a TX transmit link 20, an RX receive link 10, an LO local oscillator link 30, and a radio frequency TRX intermediate frequency filter multiplexing circuit.
The RX receiving link 10 includes main modules such as a low noise amplifier LNA, a transconductance amplifier gm, a down Mixer1, a transimpedance amplifier TIA, an intermediate frequency amplifier VGA, and an ADC, and mainly completes signal receiving.
The TX transmitting link 20 includes main modules including a power amplifier PA, a pre-amplifier PPA, an up-Mixer 2, and a DAC, and mainly performs signal transmission.
The LO local oscillator link 30 is used to provide a variable frequency local oscillator, i.e., the TX transmit link converts the intermediate frequency to a high frequency and the RX receive link converts the received RF high frequency to a low/intermediate frequency.
Through the switching of the multiplexing circuit of the radio frequency TRX intermediate frequency filter, a TX transmitting link is opened in a TX mode (transmitting mode), and an RX receiving link is opened in an RX mode (receiving mode), so that intermediate frequency filters in the multiplexing circuit of the radio frequency TRX intermediate frequency filter are connected differently and multiplexed.
The rf TRX intermediate frequency filter multiplexing circuit may employ the multiplexing filter module 100 in embodiment 1, embodiment 2, or embodiment 3.
It should be noted that although the above embodiments have been described herein, the scope of the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, alterations and modifications to the embodiments described herein, or equivalent structures or equivalent flow transformations made by the present description and drawings, apply the above technical solution, directly or indirectly, to other relevant technical fields, all of which are included in the scope of the invention.
Claims (13)
1. The multiplexing circuit of the radio frequency TRX intermediate frequency filter is characterized by comprising at least one receiving intermediate frequency filter, at least one public multiplexing intermediate frequency filter and a plurality of change-over switches; the selective switching of the receiving intermediate frequency filter and the public multiplexing intermediate frequency filter under the two modes of the TX mode and the RX mode is realized through the open or closed states of a plurality of switching switches; the switching selection common multiplexing intermediate frequency filter is performed in the TX mode, and the switching selection receiving intermediate frequency filter and the common multiplexing intermediate frequency filter are cascaded in the RX mode;
the plurality of switches comprises a second switch, a third switch, a fourth switch and a sixth switch; the first end of the public multiplexing intermediate frequency filter is connected with the RX link input point through the second change-over switch, the second end of the public multiplexing intermediate frequency filter is connected with the first end of the receiving intermediate frequency filter through the third change-over switch, and the second end of the receiving intermediate frequency filter is connected with the RX link output point; meanwhile, the first end of the common multiplexing intermediate frequency filter is also connected to the TX link input point through a sixth change-over switch, and the second end of the common multiplexing intermediate frequency filter is also connected to the TX link output point through a fourth change-over switch.
2. The multiplexing circuit of claim 1, wherein the receiving intermediate frequency filter is a filter that satisfies a design order of RX mode performance after being cascaded with the common multiplexing intermediate frequency filter, and the order is a difference order between a required filter order of the RX mode and a required filter order of the TX mode.
3. The multiplexing circuit of claim 1, wherein the common multiplexing intermediate frequency filter is a filter that satisfies a design order of RX mode performance after being cascaded with the receiving intermediate frequency filter, and the order is a filter order required by TX mode.
4. The multiplexing circuit of the radio frequency TRX intermediate frequency filter according to claim 1, wherein in the RX mode, the fourth switch and the sixth switch are opened, the second switch and the third switch are closed, and cascade connection of the common multiplexing intermediate frequency filter and the receiving intermediate frequency filter is implemented, wherein the common multiplexing intermediate frequency filter is a first stage filter, and the receiving intermediate frequency filter is a second stage filter; in TX mode, the second and third switches are opened, and the fourth and sixth switches are closed.
5. The multiplexing circuit of the radio frequency TRX intermediate frequency filter is characterized by comprising at least one receiving intermediate frequency filter, at least one public multiplexing intermediate frequency filter and a plurality of change-over switches; the selective switching of the receiving intermediate frequency filter and the public multiplexing intermediate frequency filter under the two modes of the TX mode and the RX mode is realized through the open or closed states of a plurality of switching switches; the switching selection common multiplexing intermediate frequency filter is performed in the TX mode, and the switching selection receiving intermediate frequency filter and the common multiplexing intermediate frequency filter are cascaded in the RX mode;
the plurality of switches includes an eighth switch, a ninth switch, a fourth switch, and a sixth switch; the first end of the receiving intermediate frequency filter is connected with an RX link input point, the second end of the receiving intermediate frequency filter is connected with the first end of the public multiplexing intermediate frequency filter through an eighth change-over switch, and the second end of the public multiplexing intermediate frequency filter is connected with an RX link output point through a ninth change-over switch; meanwhile, the first end of the common multiplexing intermediate frequency filter is also connected to the TX link input point through a sixth change-over switch, and the second end of the common multiplexing intermediate frequency filter is also connected to the TX link output point through a fourth change-over switch.
6. The multiplexing circuit of the radio frequency TRX intermediate frequency filter according to claim 5, wherein in the RX mode, the fourth switch and the sixth switch are opened, the eighth switch and the ninth switch are closed, so as to implement cascading of the receiving intermediate frequency filter and the common multiplexing intermediate frequency filter, wherein the receiving intermediate frequency filter is a first stage filter, and the common multiplexing intermediate frequency filter is a second stage RX filter; in TX mode, the eighth and ninth switches are opened, and the fourth and sixth switches are closed.
7. The multiplexing circuit of claim 5, wherein the receiving intermediate frequency filter is a filter that satisfies a design order of RX mode performance after being cascaded with the common multiplexing intermediate frequency filter, and the order is a difference order between the filter order required for the RX mode and the filter order required for the TX mode.
8. The multiplexing circuit of claim 5, wherein the common multiplexing intermediate frequency filter is a filter that satisfies design order of RX mode performance after cascading with the receiving intermediate frequency filter, and the order is the filter order required by TX mode.
9. The multiplexing circuit of the radio frequency TRX intermediate frequency filter is characterized by comprising at least one receiving intermediate frequency filter, at least one public multiplexing intermediate frequency filter and a plurality of change-over switches; the selective switching of the receiving intermediate frequency filter and the public multiplexing intermediate frequency filter under the two modes of the TX mode and the RX mode is realized through the open or closed states of a plurality of switching switches; the switching selection common multiplexing intermediate frequency filter is performed in the TX mode, and the switching selection receiving intermediate frequency filter and the common multiplexing intermediate frequency filter are cascaded in the RX mode;
the plurality of switches comprises a second switch, a third switch, a fourth switch, a sixth switch, a seventh switch, an eighth first switch and a ninth switch; the first end of the public multiplexing intermediate frequency filter is connected with an RX link input point through a second change-over switch, the second end of the public multiplexing intermediate frequency filter is connected with the first end of the receiving intermediate frequency filter through a third change-over switch, the second end of the receiving intermediate frequency filter is connected with an RX link output point through an eighth change-over switch, and meanwhile, the second end of the receiving intermediate frequency filter is connected with the first end of the public multiplexing intermediate frequency filter through an eighth change-over switch; meanwhile, a first end of the receiving intermediate frequency filter is connected to an RX link input point through a seventh change-over switch, and a second end of the common multiplexing intermediate frequency filter is connected with an RX link output point through a ninth change-over switch; the first end of the common multiplexing intermediate frequency filter is also connected with the TX link input point through a sixth change-over switch, and the second end of the common multiplexing intermediate frequency filter is also connected with the TX link output point through a fourth change-over switch.
10. The multiplexing circuit of the radio frequency TRX intermediate frequency filter according to claim 9, wherein in the RX mode, a switching mode in which the fourth switch, the sixth switch, the seventh switch, the eighth switch, and the ninth switch are opened, and a switching mode in which the second switch, the third switch, and the eighth switch are closed, or a switching mode in which the fourth switch, the sixth switch, the second switch, the third switch, and the eighth switch are opened, and in which the seventh switch, the eighth switch, and the ninth switch are closed are adopted, is used to implement cascade connection of the receiving intermediate frequency filter and the common multiplexing intermediate frequency filter; in TX mode, the fourth and sixth switches are closed, and the rest switches are opened.
11. The multiplexing circuit of claim 9, wherein the receiving intermediate frequency filter is a filter that satisfies a design order of RX mode performance after being cascaded with the common multiplexing intermediate frequency filter, and the order is a difference order between the filter order required for the RX mode and the filter order required for the TX mode.
12. The multiplexing circuit of claim 9, wherein the common multiplexing intermediate frequency filter is a filter that satisfies a design order of RX mode performance after being cascaded with the receiving intermediate frequency filter, and the order is a filter order required by TX mode.
13. A WiFi radio frequency chip, characterized in that a radio frequency TRX intermediate frequency filter multiplexing circuit according to any one of claims 1 to 12 is used.
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| CN107015203A (en) * | 2017-04-07 | 2017-08-04 | 荆州南湖机械股份有限公司 | A kind of new transmitting-receiving subassembly |
| CN107888224A (en) * | 2017-12-18 | 2018-04-06 | 南京中感微电子有限公司 | A kind of radio transceiver machine |
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| CN107015203A (en) * | 2017-04-07 | 2017-08-04 | 荆州南湖机械股份有限公司 | A kind of new transmitting-receiving subassembly |
| CN107888224A (en) * | 2017-12-18 | 2018-04-06 | 南京中感微电子有限公司 | A kind of radio transceiver machine |
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