阅读说明：本技术 一种射频前端电路及移动终端 (A kind of RF front-end circuit and mobile terminal ) 是由 盛雪锋 于 2019-08-16 设计创作，主要内容包括：本发明实施例提供了一种射频前端电路及移动终端。该射频前端电路包括：第一发射通路、第一接收通路、第二接收通路、第三接收通路、第四接收通路、双刀四掷开关、第一单刀双掷开关、第二单刀双掷开关、第三单刀双掷开关以及第一天线、第二天线、第三天线、第四天线。本发明实施例中提供的技术方案,通过一个双刀四掷开关和两个单刀双掷开关,实现信号收发路径的切换,使得射频前端电路的线路部署更加紧凑,线路路径更短,降低了线路的插损。(The embodiment of the invention provides a kind of RF front-end circuit and mobile terminals.The RF front-end circuit includes: the first transmitting path, the first receiving path, the second receiving path, third receiving path, the 4th receiving path, double-pole four throw switch, the first single-pole double-throw switch (SPDT), the second single-pole double-throw switch (SPDT), third single-pole double-throw switch (SPDT) and first antenna, the second antenna, third antenna, the 4th antenna.The technical solution provided in the embodiment of the present invention realizes the switching in signal transmitting and receiving path by a double-pole four throw switch and two single-pole double-throw switch (SPDT)s, so that the route deployment of RF front-end circuit is more compact, line route is shorter, reduces the Insertion Loss of route.)

1. a kind of RF front-end circuit characterized by comprising

First transmitting path, the first receiving path, the second receiving path, third receiving path, the 4th receiving path, the first hilted broadsword Commutator, the second single-pole double-throw switch (SPDT), third single-pole double-throw switch (SPDT), double-pole four throw switch and first antenna, the second antenna, Third antenna and the 4th antenna；

Wherein, the first movable end of the double-pole four throw switch is connect with the movable end of first single-pole double-throw switch (SPDT), described The first fixed end and the second fixed end of first single-pole double-throw switch (SPDT) are separately connected first transmitting path and first reception is logical Road, the second movable end of the double-pole four throw switch are connect with second receiving path, and the first of the double-pole four throw switch Fixed end is connect with the first antenna, and the second fixed end of the double-pole four throw switch is connect with second antenna；

First fixed end of second single-pole double-throw switch (SPDT) is connect with the third fixed end of the double-pole four throw switch, and described second is single Second fixed end of double-pole double throw switch is connect with the third receiving path, the movable end of second single-pole double-throw switch (SPDT) with it is described Third antenna connection；

First fixed end of the third single-pole double-throw switch (SPDT) is connect with the 4th fixed end of the double-pole four throw switch, the third list Second fixed end of double-pole double throw switch is connect with the 4th receiving path, the movable end of second single-pole double-throw switch (SPDT) with it is described The connection of 4th antenna.

2. RF front-end circuit according to claim 1, which is characterized in that first transmitting path includes at least: with First power amplifier of the first fixed end connection of first single-pole double-throw switch (SPDT)；

First receiving path includes at least: the first low noise connecting with the second fixed end of first single-pole double-throw switch (SPDT) Amplifier.

3. RF front-end circuit according to claim 1 or 2, which is characterized in that further include: first filter, described One filter is connect with the first movable end of the movable end of first single-pole double-throw switch (SPDT) and the double-pole four throw switch respectively.

4. RF front-end circuit according to claim 2, which is characterized in that second receiving path includes at least: with Second low-noise amplifier of the second movable end connection of the double-pole four throw switch.

5. RF front-end circuit according to claim 4, which is characterized in that further include: second filter, second filter Wave device is connect with the second movable end of second low-noise amplifier and the double-pole four throw switch respectively.

6. RF front-end circuit according to claim 5, which is characterized in that further include: the second transmitting path；

Second transmitting path and second receiving path are connected by the 4th single-pole double-throw switch (SPDT) and the second filter It is connected to the second movable end of the double-pole four throw switch；The second filter work with the 4th single-pole double-throw switch (SPDT) respectively Moved end is connected with the second movable end of the double-pole four throw switch.

7. RF front-end circuit according to claim 6, which is characterized in that second transmitting path includes at least: with Second power amplifier of the first fixed end connection of the 4th single-pole double-throw switch (SPDT)；

Wherein, the second fixed end of the second low-noise amplifier in second receiving path and the 4th single-pole double-throw switch (SPDT) Connection.

8. RF front-end circuit according to claim 7, which is characterized in that further include: power combiner；

First power amplifier is connect by the 5th single-pole double-throw switch (SPDT) with the power combiner；

Wherein, the movable end of the 5th single-pole double-throw switch (SPDT) is connect with first power amplifier, and the 5th hilted broadsword is double First fixed end of throw switch is connect with the second fixed end of first single-pole double-throw switch (SPDT), and the of the 5th single-pole double-throw switch (SPDT) Two fixed ends are connect with the first input end of the power combiner；

Second power amplifier is connect with the second input terminal of the power combiner；

The output end of the power combiner is connect with the first fixed end of the 4th single-pole double-throw switch (SPDT).

9. RF front-end circuit according to claim 1, which is characterized in that the third receiving path includes at least: with The third low-noise amplifier of the second fixed end connection of second single-pole double-throw switch (SPDT).

10. RF front-end circuit according to claim 9, which is characterized in that further include: third filter, the third Filter is connect with the second fixed end of the third low-noise amplifier and second single-pole double-throw switch (SPDT) respectively.

11. RF front-end circuit according to claim 1, which is characterized in that the 4th receiving path includes at least: with 4th low-noise amplifier of the second fixed end connection of the third single-pole double-throw switch (SPDT).

12. RF front-end circuit according to claim 11, which is characterized in that further include: the 4th filter, the described 4th Filter is connect with the second fixed end of the 4th low-noise amplifier and the third single-pole double-throw switch (SPDT) respectively.

13. a kind of mobile terminal characterized by comprising such as the described in any item RF front-end circuits of claim 1 to 12.

Technical field

The present embodiments relate to field of communication technology more particularly to a kind of RF front-end circuits and mobile terminal.

Background technique

As the fast development of Internet communication technology and the continuous of intelligent mobile terminal are popularized, user is to data traffic Demand be also continuously increased.It is 100Mbps~1Gbps from the transmission rate of 4G, the hardware circuit solution to 5G NR is reachable 20Gbps meets demand of the people to message transmission rate significantly.And the promotion of rate requires 5G indispensability 4*4 multi input how defeated (Multiple Input Multiple Output, MIMO) key technology out.

As shown in Figure 1, the structural schematic diagram of the RF front-end circuit for 5G mobile terminal device.The circuit framework can be realized One transmitter and four receivers or two hairs four are received, i.e., emit the reception of four tunnels all the way or two-way emits four tunnels and receives.Radio-frequency front-end in the prior art Circuit has the disadvantage in that

1, for high-frequency, big bandwidth, the differential loss of three knives, three throw switch (i.e. 3P3T) element is big, and frequency is higher, The line loss of 3P3T is bigger.

2, since the path of 3P3T switching is more, 3P3T isolation is inadequate, causes to emit signal interference reception signal.

3, the shortcomings that itself framework in order to improve 3P3T, differential loss is big, and isolation is poor, and design is caused to be useful in 5G NR system 3P3T on system, degree of difficulty greatly promote, this causes the cost ratio DPDT of market price 3P3T to come much higher, at original Say to be also a big secret worry；

4, shown in two dotted lines as shown in figure 1, the RF front-end circuit of existing 5G mobile terminal device shuttles at two Dotted line in 3P3T element needs existing element also to need specially coiling between two mould groups, and on circuit boards, cabling is got over Long, frequency is higher, and path loss is higher, it is also necessary to wear the demand of layer, these will increase path loss；

5, by two 3P3T placement constraints, and position can be distant from antenna port, and the loss of receptivity will increase 2- 3dB (signal intensity attenuation about half).

Summary of the invention

The embodiment of the invention provides a kind of RF front-end circuit and mobile terminals, mobile to solve 5G in the prior art The problem that the RF front-end circuit structural circuit design of terminal device is complicated, loss is big.

In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme:

In a first aspect, providing a kind of RF front-end circuit, comprising:

First transmitting path, the first receiving path, the second receiving path, third receiving path, the 4th receiving path, first Single-pole double-throw switch (SPDT), the second single-pole double-throw switch (SPDT), third single-pole double-throw switch (SPDT), double-pole four throw switch and first antenna, second Antenna, third antenna and the 4th antenna；

Wherein, the first movable end of the double-pole four throw switch is connect with the movable end of first single-pole double-throw switch (SPDT), The first fixed end and the second fixed end of first single-pole double-throw switch (SPDT) are separately connected first transmitting path and described first and connect Access is received, the second movable end of the double-pole four throw switch is connect with second receiving path, the double-pole four throw switch First fixed end is connect with the first antenna, and the second fixed end of the double-pole four throw switch is connect with second antenna；

First fixed end of second single-pole double-throw switch (SPDT) is connect with the third fixed end of the double-pole four throw switch, and described Second fixed end of two single-pole double-throw switch (SPDT)s is connect with the third receiving path, the movable end of second single-pole double-throw switch (SPDT) with The third antenna connection；

First fixed end of the third single-pole double-throw switch (SPDT) is connect with the 4th fixed end of the double-pole four throw switch, and described Second fixed end of three single-pole double-throw switch (SPDT)s is connect with the 4th receiving path, the movable end of second single-pole double-throw switch (SPDT) with The 4th antenna connection.

Second aspect provides a kind of mobile terminal, comprising: RF front-end circuit as described above.

The RF front-end circuit provided in the embodiment of the present invention is opened by a double-pole four throw switch and two single-pole double throws It closes (i.e. the second single-pole double-throw switch (SPDT) and third single-pole double-throw switch (SPDT)), realizes the switching in signal transmitting and receiving path.The embodiment of the present invention In RF front-end circuit, do not need to dispose route shown in dotted lines in Figure 1 again, route deployment it is more compact, line route is more It is short, the Insertion Loss of route is reduced, and the RF front-end circuit in the embodiment of the present invention, connection is simpler, reduces electricity The complexity and production cost of road design.In addition, the RF front-end circuit in the embodiment of the present invention, using double-pole four throw switch and Single-pole double-throw switch (SPDT) replaces the use of three knives, three throw switch, and double-pole four throw switch and single-pole double-throw switch (SPDT) are thrown compared to three knives three Switch, cost is lower, and element Insertion Loss is smaller.Further double-pole four throw switch compares three with the isolation of single-pole double-throw switch (SPDT) Three throw switch isolation of knife is more preferable, it is thus possible to which enough preferably isolation emit signal and receive information, reduces transmitting signal and docks The interference of the collection of letters number.

Further, the RF front-end circuit design in the embodiment of the present invention, can permit in third receiving path Device is put with third single-pole double-throw switch (SPDT) close to antenna end with the device in the second single-pole double-throw switch (SPDT) and the 4th receiving path It sets, promotes receptivity, while the use of extraneous radio frequency route (i.e. RF cable) can also be saved, make saving RF cable With while, can also save and the matching used radio frequency seat of RF cable, reduce layout area and production cost.

Detailed description of the invention

In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this For the those of ordinary skill of field, without any creative labor, it can also be obtained according to these attached drawings other Attached drawing.

Fig. 1 shows the schematic diagrames of RF front-end circuit framework in the prior art；

Fig. 2 indicates one of the structural schematic diagram of RF front-end circuit framework provided in an embodiment of the present invention；

Fig. 3 indicates the second structural representation of RF front-end circuit framework provided in an embodiment of the present invention.

Specific embodiment

The exemplary embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although showing the present invention in attached drawing Exemplary embodiment, it being understood, however, that may be realized in various forms the present invention without should be by embodiments set forth here It is limited.It is to be able to thoroughly understand the present invention on the contrary, providing these embodiments, and can be by the scope of the present invention It is fully disclosed to those skilled in the art.