CN216819832U - Radio frequency circuit compatible with connection method - Google Patents
Radio frequency circuit compatible with connection method Download PDFInfo
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- CN216819832U CN216819832U CN202123429152.8U CN202123429152U CN216819832U CN 216819832 U CN216819832 U CN 216819832U CN 202123429152 U CN202123429152 U CN 202123429152U CN 216819832 U CN216819832 U CN 216819832U
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Abstract
The utility model provides a radio frequency circuit compatible with connection, which comprises a first signal receiving end, a first filter circuit, a first inductor DL052, a second signal receiving end, a second filter circuit, a second inductor DL082 and a blocking capacitor C208; the first signal receiving terminal is electrically connected with a first inductor DL052 through a first filter circuit, the second signal receiving terminal is electrically connected with a second inductor DL082 through a second filter circuit, and the first inductor DL052 and the second inductor DL082 are electrically connected with a first connection circuit and/or a second connection circuit; the first connection circuit comprises a radio frequency switch circuit, and the first inductor DL052 and the second inductor DL082 are respectively and electrically connected with two input ends of the radio frequency switch circuit. By adopting the technical scheme of the utility model, various connection methods are compatible through the jump resistor and the switch, and the research and development cost of the PCB and the cost of products are reduced.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to a radio frequency circuit compatible with connection.
Background
In communication products such as mobile phones or tablets in the market at present, because frequency bands are required more, and RF radio frequency chip interfaces are limited, basically, radio frequency switch circuits are provided, and technical schemes that one main board can be compatible with more frequency bands are also numerous, but the general cost is higher, and great cost pressure is brought to users.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problem, the utility model discloses a radio frequency circuit compatible with connection, one main board can be compatible with more frequency bands, and the cost is reduced.
In contrast, the technical scheme of the utility model is as follows:
a radio frequency circuit compatible with connection comprises a first signal receiving end, a first filter circuit, a first inductor DL052, a second signal receiving end, a second filter circuit, a second inductor DL082 and a blocking capacitor C208;
the first signal receiving end is electrically connected with a first inductor DL052 through a first filter circuit, the second signal receiving end is electrically connected with a second inductor DL082 through a second filter circuit, and the first inductor DL052 and the second inductor DL082 are electrically connected with a first connection circuit and/or a second connection circuit;
the first connection circuit comprises a radio frequency switch circuit, the first inductor DL052 and the second inductor DL082 are respectively and electrically connected with two input ends of the radio frequency switch circuit, and the output end of the radio frequency switch circuit is electrically connected with the blocking capacitor C208;
the second connection circuit comprises a first resistance circuit and a second resistance circuit, and the first inductor DL052 is electrically connected with the blocking capacitor C208 through the first resistance circuit; the second inductor DL082 is electrically connected with the dc blocking capacitor C208 through a second resistance circuit.
By adopting the technical scheme, different requirements of customers can be met according to needs, and the signals of two frequency bands can be switched by adopting the radio frequency switching circuit; and a radio frequency switch circuit is not adopted, the equipment can only process signals of one frequency band, one path corresponding to the first resistance circuit and the second resistance circuit is set as a path, the other path of resistance can not be welded on a board, the circuit design compatible with multiple frequency bands is realized by one PCB, and the research and development cost is reduced.
As a further improvement of the present invention, the first connection circuit includes a radio frequency switch chip U2013, a first resistor RB212, a second resistor RB213, and a third resistor RB217, and the first inductor DL052 is electrically connected to the RF1 terminal of the radio frequency switch chip U2013 through the first resistor RB 212; the second inductor DL082 is electrically connected with the RF2 end of the radio frequency switch chip U2013 through a second resistor RB 213; the ANT end of the radio frequency switch chip U2013 is electrically connected with the blocking capacitor C208 through a third resistor RB 217.
As a further improvement of the present invention, the third resistor RB217 is grounded via an inductor LB 209.
As a further improvement of the utility model, the VDD terminal of the radio frequency switch chip U2013 is electrically connected to the power supply terminal and grounded through a switch power supply filter capacitor CB 135; the VCTL end of the radio frequency switch chip U2013 is grounded through an EN pin filter capacitor CB136 of the switch.
As a further improvement of the utility model, the radio frequency switch chip U2013 is MXD 8625C.
As a further improvement of the present invention, the second connection circuit includes a fourth resistor RB211, a fifth resistor RB215, a sixth resistor RB214, and a seventh resistor RB216, the first inductor DL052 is electrically connected to the fifth resistor RB215 through the fourth resistor RB211, and the fifth resistor RB215 is electrically connected to the dc blocking capacitor C208; the second inductor DL082 is electrically connected with a seventh resistor RB216 through a sixth resistor RB214, and the seventh resistor RB216 is electrically connected with the dc blocking capacitor C208. The dc blocking capacitor C208 is electrically connected to the intermediate frequency IC for demodulation, so as to achieve the purpose of RF reception.
As a further improvement of the present invention, the first filter circuit includes an inductor DL051, a capacitor DC052, a capacitor DC053 and a filter UD05, the first signal receiving terminal is electrically connected with one end of the inductor DL051, the other end of the inductor DL051 is grounded through the capacitor DC052, the other end of the inductor DL051 is electrically connected with an input end of the filter UD05, and an output end of the filter UD05 is electrically connected with one end of the inductor DL052 and is grounded through the capacitor DC 053; the other end of the inductor DL052 is also grounded through a capacitor DC 054;
the second filtering circuit comprises an inductor DL081, a capacitor DC082, a capacitor DC083 and a filter UD08, wherein the second signal receiving end is electrically connected with one end of the inductor DL081, the other end of the inductor DL081 is grounded through the capacitor DC082, the other end of the inductor DL081 is electrically connected with the input end of the filter UD08, and the output end of the filter UD08 is electrically connected with one end of the inductor DL082 and is grounded through the capacitor DC 083; the other end of the inductor DL082 is also grounded through a capacitor DC 084.
Compared with the prior art, the utility model has the beneficial effects that:
by adopting the technical scheme of the utility model, multiple connection methods are compatible through the jump resistor and the switch, and the research and development cost of the PCB and the cost of products are reduced.
Drawings
Fig. 1 is a circuit diagram of a compatible radio frequency circuit according to an embodiment of the present invention.
Fig. 2 is a circuit diagram compatible with two frequency bands according to embodiment 1 of the present invention.
Fig. 3 is a circuit diagram of only the B5 frequency band in embodiment 1 of the present invention.
Fig. 4 is a circuit diagram of only the B8 frequency band in embodiment 1 of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, a radio frequency circuit compatible with connection includes a first signal receiving terminal, a first filter circuit, a first inductor DL052, a second signal receiving terminal, a second filter circuit, a second inductor DL082 and a dc blocking capacitor C208; the first signal receiving end is electrically connected with a first inductor DL052 through a first filter circuit, the second signal receiving end is electrically connected with a second inductor DL082 through a second filter circuit, and the first inductor DL052 and the second inductor DL082 are electrically connected with a first connection circuit and/or a second connection circuit; the first connection circuit comprises a radio frequency switch circuit, the first inductor DL052 and the second inductor DL082 are respectively and electrically connected with two input ends of the radio frequency switch circuit, and the output end of the radio frequency switch circuit is electrically connected with the blocking capacitor C208; the second connection circuit comprises a first resistance circuit and a second resistance circuit, and the first inductor DL052 is electrically connected with the blocking capacitor C208 through the first resistance circuit; the second inductor DL082 is electrically connected with the dc blocking capacitor C208 through a second resistance circuit.
Specifically, the first filter circuit comprises an inductor DL051, a capacitor DC052, a capacitor DC053 and a filter UD05, wherein the first signal receiving end is electrically connected with one end of the inductor DL051, the other end of the inductor DL051 is grounded through the capacitor DC052, the other end of the inductor DL051 is electrically connected with the input end of a filter UD05, and the output end of the filter UD05 is electrically connected with one end of the inductor DL052 and is grounded through the capacitor DC 053; the other end of the inductor DL052 is also grounded through a capacitor DC 054; the second filtering circuit comprises an inductor DL081, a capacitor DC082, a capacitor DC083 and a filter UD08, wherein the second signal receiving end is electrically connected with one end of the inductor DL081, the other end of the inductor DL081 is grounded through the capacitor DC082, the other end of the inductor DL081 is electrically connected with the input end of the filter UD08, and the output end of the filter UD08 is electrically connected with one end of the inductor DL082 and is grounded through the capacitor DC 083; the other end of the inductor DL082 is also grounded through a capacitor DC 084.
The first connection circuit comprises a radio frequency switch chip U2013, a first resistor RB212, a second resistor RB213 and a third resistor RB217, and the first inductor DL052 is electrically connected with the RF1 end of the radio frequency switch chip U2013 through the first resistor RB 212; the second inductor DL082 is electrically connected with the RF2 end of the radio frequency switch chip U2013 through a second resistor RB 213; the ANT end of the radio frequency switch chip U2013 is electrically connected with the blocking capacitor C208 through a third resistor RB 217. The third resistor RB217 is grounded via an inductor LB 209. The VDD end of the radio frequency switch chip U2013 is electrically connected with the power supply end and is grounded through a switch power supply filter capacitor CB 135; the VCTL end of the radio frequency switch chip U2013 is grounded through an EN pin filter capacitor CB136 of the switch and is connected with the control end of the equipment main control system. Preferably, the model of the radio frequency switch chip U2013 is MXD 8625C.
The second connection circuit comprises a fourth resistor RB211, a fifth resistor RB215, a sixth resistor RB214 and a seventh resistor RB216, the first inductor DL052 is electrically connected with the fifth resistor RB215 through the fourth resistor RB211, and the fifth resistor RB215 is electrically connected with the DC blocking capacitor C208; the second inductor DL082 is electrically connected with a seventh resistor RB216 through a sixth resistor RB214, and the seventh resistor RB216 is electrically connected with the dc blocking capacitor C208. The dc blocking capacitor C208 is electrically connected to the intermediate frequency IC for demodulation, so as to achieve the purpose of RF reception.
The capacitors DC052, DC053 and DC054 are matching devices of a B5 frequency band, the capacitors DC082, DC083 and DC084 are matching devices of a B8 frequency band, and the LB209 is a common end matching device.
When the device needs to process two frequency bands, the layout of the circuit board may be as shown in fig. 2, that is, the first resistor circuit and the second resistor circuit do not have resistors attached. The working principle is as follows:
when receiving a signal B5 frequency, a radio frequency signal passes through an inductor DL051 to reach a filter UD05, other unnecessary signals are filtered through a filter UD05, signals of a B5 frequency band are reserved, the signals pass through an inductor DL052 and a resistor RB212 to reach an RF1 pin of a radio frequency switch chip U2013, the default low state of a 6 pin (VCTL end) of a switch of the radio frequency switch chip U2013 is that RF1 is opened, RF2 is closed, a B5 radio frequency signal passes through RF1 to a common end 5 pin (ANT end) of the radio frequency switch chip U2013, then the radio frequency signal passes through a resistor RB217 and a blocking capacitor C208 to be demodulated, and the purpose of RF receiving is achieved. When the frequency of a signal B8 is received, a radio frequency signal passes through an inductor DL081 and reaches a UD08 filter to remove other unnecessary clutter signals, a B8 frequency band signal is reserved, the radio frequency signal passes through an inductor DL082 and a resistor RB213 and reaches a RF2 pin of a radio frequency switch chip U2013, at this time, under the control of a Modem system controlled by equipment, a pin 6 (VCTL end) of the radio frequency switch chip U2013 can be pulled up, an RF2 pin of the radio frequency switch chip U2013 is opened, a B8 radio frequency signal passes through the RF2 pin to a pin 5 (ANT end) of a public end, and then the radio frequency signal passes through a resistor RB217 and a DC blocking capacitor C208 to be demodulated to an intermediate frequency IC, so that the purpose of RF receiving is achieved.
When the device functions to process only the B5 frequency band, as shown in fig. 3, the rf switch chip U2013 may be eliminated, and the specific logic path is as follows:
the radio frequency signal of B5 passes through DL051, reaches filter UD05, passes through filter UD05 to filter other unnecessary signals, reserves signals of a B5 frequency band, passes through inductor DL052, passes through resistors RB211 and RB215, and then passes through a blocking capacitor C208 to reach an intermediate frequency IC for demodulation; at this time, since only B5 exists, the logic path of B8 is in NC state (DL 081/UD08/DL082 is not attached to the device), and both RB212 and the radio frequency switch chip U2013 are in NC state.
When the device functions to process only the B8 frequency band, as shown in fig. 4, the rf switch chip U2013 may be removed, and the specific logic path is as follows:
the radio frequency signal of B8 passes through DL081, reaches filter UD08, passes through filter UD08 to filter other unnecessary signals, retains the signal of B8 frequency band, passes through inductor DL082, passes through resistors RB214 and RB216, and then passes through blocking capacitor C208 to intermediate frequency IC for demodulation; at this time, since only B8 exists, the logic path of B5 is in NC state (DL 051/UD05/DL052 is not attached to the device), and both RB213 and switch U2013 are in NC state.
In summary, when the device functions to process the B5 band and the B8 band, the received signals of B5 and B8 will reach the back end through the switch chip U2013, so as to achieve the purpose of switching. When the function of the device is to process the B5 frequency band and the B8 frequency band does not exist, the signal of B5 can pass through the resistors RB211 and RB215, so that the signal can directly reach the back end without passing through the radio frequency switch chip U2013. When the function of the device is to process the B8 frequency band and the B5 frequency band does not exist, the signal passes through the resistors RB214 and RB216, so that the signal directly reaches the rear end for demodulation without passing through the switch chip U2013. Therefore, the purpose that one PCB circuit is compatible with different functions is achieved.
The above is B5/B8 as an example, and other frequency bands can be used according to the above principle.
The above-mentioned embodiments are preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and the equivalent changes in shape and structure according to the present invention are within the protection scope of the present invention.
Claims (7)
1. A radio frequency circuit compatible for interfacing, comprising: the inductor comprises a first signal receiving end, a first filter circuit, a first inductor DL052, a second signal receiving end, a second filter circuit, a second inductor DL082 and a blocking capacitor C208;
the first signal receiving end is electrically connected with a first inductor DL052 through a first filter circuit, the second signal receiving end is electrically connected with a second inductor DL082 through a second filter circuit, and the first inductor DL052 and the second inductor DL082 are electrically connected with a first connection circuit and/or a second connection circuit;
the first connection circuit comprises a radio frequency switch circuit, the first inductor DL052 and the second inductor DL082 are respectively and electrically connected with two input ends of the radio frequency switch circuit, and the output end of the radio frequency switch circuit is electrically connected with the blocking capacitor C208;
the second connection circuit comprises a first resistance circuit and a second resistance circuit, and the first inductor DL052 is electrically connected with the blocking capacitor C208 through the first resistance circuit; the second inductor DL082 is electrically connected with the dc blocking capacitor C208 through a second resistance circuit.
2. The compatible radio frequency circuit of claim 1, wherein: the first connection circuit comprises a radio frequency switch chip U2013, a first resistor RB212, a second resistor RB213 and a third resistor RB217, and the first inductor DL052 is electrically connected with the RF1 end of the radio frequency switch chip U2013 through the first resistor RB 212; the second inductor DL082 is electrically connected with the RF2 end of the radio frequency switch chip U2013 through a second resistor RB 213; the ANT end of the radio frequency switch chip U2013 is electrically connected with the blocking capacitor C208 through a third resistor RB 217.
3. The compatible radio frequency circuit of claim 2, wherein: the third resistor RB217 is grounded via an inductor LB 209.
4. The compatible radio frequency circuit of claim 3, wherein: the VDD end of the radio frequency switch chip U2013 is electrically connected with the power supply end and is grounded through a switch power supply filter capacitor CB 135; the VCTL end of the radio frequency switch chip U2013 is grounded through an EN pin filter capacitor CB136 of the switch.
5. The compatible radio frequency circuit of claim 2, wherein: the type of the radio frequency switch chip U2013 is MXD 8625C.
6. The compatible radio frequency circuit of claim 1, wherein: the second connection circuit comprises a fourth resistor RB211, a fifth resistor RB215, a sixth resistor RB214 and a seventh resistor RB216, the first inductor DL052 is electrically connected with the fifth resistor RB215 through the fourth resistor RB211, and the fifth resistor RB215 is electrically connected with the DC blocking capacitor C208; the second inductor DL082 is electrically connected with a seventh resistor RB216 through a sixth resistor RB214, and the seventh resistor RB216 is electrically connected with the dc blocking capacitor C208;
the dc blocking capacitor C208 is electrically connected to the intermediate frequency IC.
7. The radio frequency circuit compatible with connection according to any one of claims 1 to 6, wherein: the first filter circuit comprises an inductor DL051, a capacitor DC052, a capacitor DC053 and a filter UD05, wherein the first signal receiving end is electrically connected with one end of the inductor DL051, the other end of the inductor DL051 is grounded through the capacitor DC052, the other end of the inductor DL051 is electrically connected with the input end of a filter UD05, and the output end of the filter UD05 is electrically connected with one end of the inductor DL052 and is grounded through the capacitor DC 053; the other end of the inductor DL052 is also grounded through a capacitor DC 054;
the second filtering circuit comprises an inductor DL081, a capacitor DC082, a capacitor DC083 and a filter UD08, wherein the second signal receiving end is electrically connected with one end of the inductor DL081, the other end of the inductor DL081 is grounded through the capacitor DC082, the other end of the inductor DL081 is electrically connected with the input end of the filter UD08, and the output end of the filter UD08 is electrically connected with one end of the inductor DL082 and is grounded through the capacitor DC 083; the other end of the inductor DL082 is also grounded through a capacitor DC 084.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123429152.8U CN216819832U (en) | 2021-12-31 | 2021-12-31 | Radio frequency circuit compatible with connection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123429152.8U CN216819832U (en) | 2021-12-31 | 2021-12-31 | Radio frequency circuit compatible with connection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216819832U true CN216819832U (en) | 2022-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123429152.8U Active CN216819832U (en) | 2021-12-31 | 2021-12-31 | Radio frequency circuit compatible with connection method |
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| Country | Link |
|---|---|
| CN (1) | CN216819832U (en) |
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2021
- 2021-12-31 CN CN202123429152.8U patent/CN216819832U/en active Active
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