JP2018029328A - Diversity switch circuit, high-frequency module, and communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diversity switch circuit that can use a diversity antenna as a transmitting-receiving duplexer antenna.SOLUTION: A diversity switch circuit 1 comprises: a first switch 10 that has a first common terminal 11 connected with a diversity antenna ANT, and a first selection terminal 12 connected with a first signal path 200 and a second selection terminal 14 connected with a second signal path 300 different from the first signal path 200; and a second switch 20 provided on the first signal path 200, and has a second common terminal 21 connected with the first selection terminal 12, and at least two selection terminals 22. A reception signal received by the diversity antenna ANT is transmitted to the first signal path 200 when the first common terminal 11 and the first selection terminal 12 are connected with each other. A transmission signal to be transmitted by the diversity antenna ANT is transmitted to the second signal path 300 when the first common terminal 11 and the second selection terminal 14 are connected with each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a diversity switch circuit, a high frequency module, and a communication device.

  2. Description of the Related Art Conventionally, communication quality and reliability at the time of receiving a signal have been improved by a main antenna and a so-called diversity antenna which is a sub-antenna provided separately from the main antenna. In recent years, communication devices such as mobile terminals have been required to support a plurality of frequency bands and a plurality of radio systems, that is, so-called multiband and multimode of a terminal, by a diversity antenna. A diversity switch circuit that separates (demultiplexes) received signals into frequency bands is used. Specifically, in Patent Document 1, a circuit as shown in FIG. 7 is used. FIG. 7 is a configuration diagram showing an example of a conventional diversity switch circuit 400.

  As shown in FIG. 7, in the conventional diversity switch circuit 400, a switch 410 connected to the diversity antenna ANT and a switch circuit 420 for supporting multiband are connected in series. For example, the switch circuit 420 includes switches 423a, 423b,..., 423n as n switches connected to a signal path through which a plurality of signals having different frequency bands are transmitted. Although not shown in FIG. 7, for example, a filter for filtering the received signal or a low noise amplifier (LNA) for amplifying the received signal is connected to the switches 423a, 423b,. . Note that the switch 410 and the switch circuit 420 may be damaged or deteriorate in performance by receiving a received signal with a large power due to, for example, a short distance between the base station and the communication device on which the diversity switch circuit 400 is mounted. There are things to do. Therefore, when the power of the signal received by the diversity antenna ANT is large, the switch 410 is turned off so that these circuits do not receive the received signal with high power.

Special table 2015-517753 gazette

  By the way, although the diversity antenna is an antenna used for reception, it is considered that the diversity antenna needs to be used for transmission as the number of bands increases or the communication capacity increases. However, since the diversity switch circuit described in Patent Document 1 is a reception-only circuit that supports multi-band reception signals and does not support transmission signals, transmission diversity is separate from the reception diversity antenna. An antenna is required. In this case, the number of antennas provided in a communication device such as a portable terminal increases, and the antenna space in the housing of the communication device increases. That is, it is difficult to reduce the size of the communication device.

  Therefore, an object of the present invention is to provide a diversity switch circuit, a high-frequency module, and a communication device that can use a diversity antenna as a transmission / reception antenna.

  To achieve the above object, a diversity switch circuit according to an aspect of the present invention includes a first common terminal connected to a diversity antenna, a first selection terminal connected to a first signal path, and the first signal. A first switch having a second selection terminal connected to a second signal path that is different from the path, a second common terminal provided in the first signal path and connected to the first selection terminal, and A second switch having at least two selection terminals, and the received signal received by the diversity antenna is the first signal path when the first common terminal and the first selection terminal are connected. The transmission signal transmitted by the diversity antenna is transmitted to the second signal path when the first common terminal and the second selection terminal are connected.

  Thereby, when the first common terminal and the first selection terminal are connected, one diversity antenna can be used for reception, and the one diversity antenna is at least 2 in the second switch and the second common terminal. A desired reception signal is received by connecting a specific selection terminal of the two selection terminals. The specific selection terminal is a selection terminal to which a passband filter (for example, an elastic wave filter or the like) corresponding to a frequency band of a desired reception signal is connected. When the first common terminal and the second selection terminal are connected, a transmission signal transmitted to the second signal path can be sent to the one diversity antenna, and the one diversity antenna can be used for transmission. Can be used. In this manner, the diversity switch circuit that can receive received signals having different frequency bands allows the diversity antenna to be used as a shared antenna, and the communication device such as a portable terminal can be downsized.

  In addition, a termination resistor may be connected to one selection terminal of at least two selection terminals included in the second switch.

  Since the diversity antenna is used as a transmission / reception antenna, even when the first common terminal and the first selection terminal are not connected, a transmission signal having a large power transmitted to the second signal path is the second. May leak into the switch. Further, when the power of the signal received by the diversity antenna is large, a received signal having a large power may leak to the second switch side even when the first common terminal and the first selection terminal are not connected. is there. On the other hand, a termination resistor is connected to one of the at least two selection terminals of the second switch. Thereby, when the diversity antenna is used as a transmission antenna, or when the power of the signal received by the diversity antenna is large, the second common terminal and the selection terminal to which the termination resistor is connected are connected. Thus, the energy of these signals having high power can be released to the ground by the terminating resistor. Therefore, it is possible to suppress a circuit such as a filter or an LNA connected to the second switch from being damaged or having a degraded performance by a signal having a large power.

  A matching circuit may be connected between the first selection terminal and the second common terminal.

  As a result, impedance matching between the first switch and the second switch is performed, and the level of loss (return loss) generated in the signal transmitted to the first signal path can be suppressed.

  The second switch is composed of two or more second switches, and a first multiplexer is connected between the first selection terminal and the second common terminal of each of the two or more second switches. May be.

  As a result, for example, a plurality of received signals having different frequency bands such as LB (Low Band), MB (Middle Band), and HB (High Band) can be simultaneously received. Correspondence becomes possible.

  At this time, the first switch further includes a third selection terminal connected to the first signal path, and a third switch is connected between the first multiplexer and the second common terminal. The received signal received by the diversity antenna does not pass through the first multiplexer when the first common terminal and the third selection terminal are connected and the third switch is turned off. The first signal path may be transmitted.

  When the first common terminal and the third selection terminal are connected and the third switch is turned off, the reception signal received by the diversity antenna is transmitted to the first signal path without passing through the first multiplexer. Can be made. Therefore, the first common terminal and the first selection terminal are connected when the response to CA is necessary, and the third switch is turned on, and the first common terminal when the response to CA is unnecessary. The terminal and the third selection terminal are connected, and the third switch is turned off. Thereby, when it is not necessary to cope with CA, insertion loss (loss generated in the reception signal) due to the first multiplexer can be suppressed.

  The diversity switch circuit may further include a fourth common switch provided in the second signal path and connected to the second selection terminal, and a fourth switch having at least two selection terminals.

  Accordingly, a plurality of transmission signals in different frequency bands can be transmitted simultaneously by the fourth switch.

  A matching circuit may be connected between the second selection terminal and the third common terminal.

  As a result, impedance matching between the first switch and the fourth switch is performed, and loss (return loss) occurring in the signal transmitted to the second signal path can be suppressed.

  The fourth switch includes two or more fourth switches, and a second multiplexer is connected between the second selection terminal and the third common terminal of each of the two or more fourth switches. May be.

  Thereby, for example, a plurality of transmission signals having different frequency bands such as LB, MB, and HB can be transmitted at the same time, so that it is possible to cope with CA.

  At this time, the first switch further includes a fourth selection terminal connected to the second signal path, and a fifth switch is connected between the second multiplexer and the third common terminal. The transmission signal transmitted by the diversity antenna does not pass through the second multiplexer when the first common terminal and the fourth selection terminal are connected and the fifth switch is turned off. May be transmitted to the second signal path.

  When the first common terminal and the fourth selection terminal are connected and the fifth switch is turned off, the transmission signal transmitted to the second signal path is transmitted to the diversity antenna without passing through the second multiplexer. Can send. Therefore, the first common terminal and the second selection terminal are connected when the CA is required, and the fifth switch is turned on. When the CA is not required, the first common terminal is connected. And the fourth selection terminal are connected, and the fifth switch is turned off. Thereby, when it is not necessary to cope with CA, insertion loss (loss generated in the transmission signal) due to the second multiplexer can be suppressed.

  In addition, a high frequency module according to an aspect of the present invention includes the above-described diversity switch circuit and a filter connected to at least two selection terminals included in the second switch or at least two selection terminals included in the fourth switch; An amplifier circuit connected to the filter.

  Thereby, the high frequency module which can use a diversity antenna as a transmission / reception shared antenna can be provided.

  In addition, a communication device according to an aspect of the present invention includes an RF signal processing circuit that processes the reception signal and the transmission signal, and the reception signal and the transmission signal between the diversity antenna and the RF signal processing circuit. And the above-described high-frequency module for transmitting and receiving.

  Thereby, the communication apparatus which can use a diversity antenna as a transmission / reception shared antenna can be provided.

  According to the diversity switch circuit, the high-frequency module, and the communication device according to the present invention, the diversity antenna can be used as a shared antenna.

1 is a configuration diagram illustrating an example of a diversity switch circuit according to a first embodiment. 5 is a configuration diagram illustrating an example of a diversity switch circuit according to a second embodiment. FIG. FIG. 10 is a configuration diagram illustrating an example of a diversity switch circuit according to a third embodiment. FIG. 6 is a configuration diagram illustrating an example of a diversity switch circuit according to a fourth embodiment. FIG. 10 is a configuration diagram illustrating an example of a diversity switch circuit according to a fifth embodiment. FIG. 10 is a configuration diagram illustrating an example of a communication device according to a sixth embodiment. It is a block diagram which shows an example of the conventional diversity switch circuit.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the embodiments and the drawings. It should be noted that each of the embodiments described below shows a comprehensive or specific example. The numerical values, the constituent elements, the arrangement of the constituent elements, the connection form, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. Among the constituent elements in the following embodiments, constituent elements not described in the independent claims are described as optional constituent elements. Each figure is a mimetic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected about the same component.

(Embodiment 1)
A diversity switch circuit 1 according to the first embodiment will be described with reference to FIG.

  FIG. 1 is a configuration diagram illustrating an example of a diversity switch circuit 1 according to the first embodiment.

  The diversity switch circuit 1 is a circuit that can receive received signals having different frequency bands. In the present embodiment, the diversity switch circuit 1 can simultaneously transmit a plurality of transmission signals in different frequency bands. Diversity antenna ANT is a sub-antenna provided separately from the main antenna, and is used to improve communication quality and reliability. In general, a diversity antenna is used as a receiving antenna, but in the present invention, it can be used as a transmission / reception antenna.

  The diversity switch circuit 1 includes a first switch 10, a second switch 20, and a fourth switch 30.

  The first switch 10 includes a first common terminal 11 connected to the diversity antenna ANT, and a second signal that is different from the first selection terminal 12 and the first signal path 200 connected to the first signal path 200. The second selection terminal 14 connected to the path 300 is included. In the present embodiment, the first switch 10 has a first common terminal 11a and a first common terminal 11b, which are collectively referred to as the first common terminal 11. The first switch 10 includes a switch 13 and a switch 15. When the switch 13 is turned on, the first common terminal 11 a and the first selection terminal 12 are connected, and when the switch 15 is turned on, the first common is provided. The terminal 11b and the second selection terminal 14 are connected. For example, when the switch 13 is turned on, the switch 15 is turned off. When the switch 15 is turned on, the switch 13 is turned off, but there is a period during which both the switch 13 and the switch 15 are turned on. Also good.

  For example, the switch 13 and the switch 15 are semiconductor switches using a diode, a field effect transistor, or the like, and are controlled from the outside of the first switch 10 (for example, an RF signal processing circuit (RFIC: Radio Frequency Integrated Circuit) 120 described later). It is turned on / off by a signal. The first common terminal 11a and the first common terminal 11b may be a single terminal integrated with each other. In this case, instead of the switch 13 and the switch 15, the first switch 10 is a switch that switches the connection between the integrated first common terminal 11, the first selection terminal 12, and the second selection terminal 14. Have. However, even in this case, the connection between the one first common terminal 11 and the first selection terminal 12 and the connection between the one first common terminal 11 and the second selection terminal 14 may be made simultaneously.

  The second switch 20 includes a second common terminal 21 connected to the first selection terminal 12 and at least two selection terminals 22. The second common terminal 21 of the second switch 20 is connected to the first selection terminal 12 of the first switch 10. Note that “the second common terminal 21 of the second switch 20 is connected to the first selection terminal 12 of the first switch 10” means that the second common terminal 21 is connected to another circuit (for example, a matching circuit 50 described later). Or the case where it is connected to the first selection terminal 12 via the multiplexer 60 or the like. The second switch 20 includes a switch 23, and the second common terminal 21 and the selection terminal 22 are connected when the switch 23 is turned on. In the present embodiment, the second switch 20 has second common terminals 21a, 21b,..., 21n as n common terminals, which are collectively referred to as a second common terminal 21, and n As the selection terminals, there are selection terminals 22a, 22b,..., 22n, which are collectively referred to as selection terminals 22. In the present embodiment, the second switch 20 includes switches 23a, 23b,..., 23n as n switches, and these are collectively referred to as the switch 23. For example, when the switch 23n is turned on, the second common terminal 21n and the selection terminal 22n are connected.

  For example, the switch 23 is a semiconductor switch using a diode or a field effect transistor, and is turned on / off by a control signal from the outside of the second switch 20 (for example, an RF signal processing circuit 120 described later). The second common terminals 21a, 21b,..., 21n may be one terminal integrated with each other. In this case, the second switch 20 includes an integrated second common terminal 21 and selection terminals 22a, 22b,..., 22n instead of the switches 23a, 23b,. A switch for switching the connection; However, even in this case, the one second common terminal 21 and two or more selection terminals of the selection terminals 22a, 22b,..., 22n may be simultaneously connected.

  The second switch 20 is provided in the first signal path 200. The provision of the second switch 20 in the first signal path 200 means that the second switch 20 is provided on the path connected to the first selection terminal 12. For example, when the second common terminal 21n and the selection terminal 22n are connected, the signal passes through the path connecting the first selection terminal 12, the second common terminal 21n, and the selection terminal 22n as the first signal path 200.

  The fourth switch 30 includes a third common terminal 31 connected to the second selection terminal 14 and at least two selection terminals 32. The third common terminal 31 of the fourth switch 30 is connected to the second selection terminal 14 of the first switch 10. Note that "the third common terminal 31 of the fourth switch 30 is connected to the second selection terminal 14 of the first switch 10" means that the third common terminal 31 is connected to the second selection terminal via another circuit. 14 is also included. The fourth switch 30 includes a switch 33. When the switch 33 is turned on, the third common terminal 31 and the selection terminal 32 are connected. In the present embodiment, the fourth switch 30 has third common terminals 31a, 31b,..., 31n as n common terminals, which are collectively referred to as a third common terminal 31, and n Each of the selection terminals has selection terminals 32a, 32b,..., 32n, which are collectively referred to as a selection terminal 32. In the present embodiment, the fourth switch 30 includes switches 33a, 33b,..., 33n as n switches, and these are collectively referred to as a switch 33. For example, when the switch 33n is turned on, the third common terminal 31n and the selection terminal 32n are connected. For example, the switch 33 is a semiconductor switch using a diode, a field effect transistor, or the like, and is turned on / off by a control signal from the outside of the fourth switch 30 (for example, an RF signal processing circuit 120 described later). The third common terminals 31a, 31b,..., 31n may be one terminal integrated with each other. In this case, the fourth switch 30 includes an integrated third common terminal 31 and selection terminals 32a, 32b,..., 32n instead of the switches 33a, 33b,. A switch for switching the connection; However, even in this case, the one third common terminal 31 and two or more selection terminals of the selection terminals 32a, 32b,..., 32n may be simultaneously connected.

  The fourth switch 30 is provided in the second signal path 300. The provision of the fourth switch 30 in the second signal path 300 means that the fourth switch 30 is provided on the path connected to the second selection terminal 14. For example, when the third common terminal 31n and the selection terminal 32n are connected, the signal passes through the path connecting the second selection terminal 14, the third common terminal 31n, and the selection terminal 32n as the second signal path 300.

  The reception signal received by the diversity antenna ANT is transmitted to the first signal path 200 when the first common terminal 11a and the first selection terminal 12 are connected. That is, the first signal path 200 is a path through which a reception signal received by the diversity antenna ANT is transmitted. Therefore, a reception filter (a filter constituted by an acoustic wave resonator or an LC circuit) or an amplifier circuit such as an LNA is connected to the selection terminal 22 of the second switch 20. Each of the selection terminals 22a, 22b,..., 22n is connected, for example, to a filter having a different pass band, so that the second switch 20 causes the diversity switch circuit 1 to receive received signals having different frequency bands. It can be received.

  Also, the transmission signal transmitted by the diversity antenna ANT is transmitted to the second signal path 300 when the first common terminal 11b and the second selection terminal 14 are connected. That is, the second signal path 300 is a path through which a transmission signal transmitted by the diversity antenna ANT is transmitted. Therefore, the selection terminal 32 of the fourth switch 30 is connected to a transmission filter (a filter constituted by an acoustic wave resonator or an LC circuit) or an amplifier circuit such as a power amplifier (PA). For example, filters having different pass bands are connected to the selection terminals 32a, 32b,..., 32n, and a plurality of transmission signals having different frequency bands are simultaneously transmitted via the fourth switch 30. That is, a transmission signal selected by the fourth switch 30 from among a plurality of transmission signals in different frequency bands can be transmitted from the diversity antenna ANT. Thus, since the 1st switch 10 has the 2nd selection terminal 14, when the 1st common terminal 11b and the 2nd selection terminal 14 are connected, the transmission signal transmitted to the 2nd signal course 300 Can be transmitted to the diversity antenna ANT, and the diversity antenna ANT can also be used for transmission.

  In addition, as FIG. 1 shows, the 1st signal path | route 200 and the 2nd signal path | route 300 are mutually different paths | routes. At this time, the path connecting the first signal path 200 and the diversity antenna ANT and the path connecting the second signal path 300 and the diversity antenna ANT are closer to the diversity antenna ANT side than the switches 13 and 15 of the first switch 10. It is branched at. Accordingly, since the switch 13 is not provided in the path connecting the second signal path 300 and the diversity antenna ANT, loss due to the switch 13 is less likely to occur in the transmission signal transmitted to the second signal path 300. Here, the first signal path 200 and the second signal path 300 are different from each other, for example, a path connected to the selection terminal 22 (diversity antenna ANT of the second switch 20 as viewed from the diversity antenna ANT). The path on the opposite side to the path: the path connected to the right side of the second switch 20 in FIG. 1 and the path connected to the selection terminal 32 (as viewed from the diversity antenna ANT, opposite to the diversity antenna ANT of the fourth switch 30) 1 side route: a route connected to the right side of the fourth switch 30 in FIG. 1) means that they are not combined (not shared) by a circuit such as a switch circuit in the subsequent stage. For example, when the path connected to the selection terminal 22 and the path connected to the selection terminal 32 are grouped (shared) by a switch that selects and outputs one of a plurality of inputs in the subsequent stage. The first signal path 200 and the second signal path 300 are not different paths. On the other hand, for example, the path connected to the selection terminal 22 and the path connected to the selection terminal 32 are each connected to a common ground, or are connected to different terminals of one RF signal processing circuit. In some cases, the first signal path 200 and the second signal path 300 are different from each other.

  As described above, the diversity antenna ANT can be shared by the diversity switch circuit 1 that can receive reception signals having different frequency bands and can simultaneously transmit a plurality of transmission signals of different frequency bands. It can be used as an antenna.

(Embodiment 2)
Next, the diversity switch circuit 1a according to the second embodiment will be described with reference to FIG.

  FIG. 2 is a configuration diagram illustrating an example of the diversity switch circuit 1a according to the second embodiment.

  The diversity switch circuit 1a according to the second embodiment is different from the diversity switch circuit 1 according to the first embodiment in that a second switch 40 is provided instead of the second switch 20. Since other configurations are the same as those in the first embodiment, description thereof is omitted. The second switch 40 is different from the second switch 20 according to the first embodiment in that a termination resistor 41 is provided. Since other configurations are the same as those in the first embodiment, description thereof is omitted.

  A termination resistor 41 is connected to one of the at least two selection terminals 22 of the second switch 40. The termination resistor 41 is a resistor having one end connected to the selection terminal 22 and the other end connected to the ground. The termination resistor 41 is a resistor for releasing the energy of the signal input to the second switch 40 to the ground, and the resistance value is, for example, 50Ω. The termination resistor 41 is built in the second switch 40, for example. In the present embodiment, as shown in FIG. 2, a termination resistor 41 is connected to the selection terminal 22n.

  Since the diversity antenna ANT is used as a transmission / reception antenna, even when the first common terminal 11 and the first selection terminal 12 are not connected, transmission with a large amount of power transmitted to the second signal path 300 is performed. A signal may leak to the second switch 40. In addition, when the power of the signal received by the diversity antenna ANT is large, even if the first common terminal 11 and the first selection terminal 12 are not connected, a received signal with large power leaks to the second switch 40. May come. For example, a filter for filtering a received signal or an LNA for amplifying the received signal is connected to the second switch 40, but these circuits are damaged by receiving a signal with a large power, The performance may deteriorate. On the other hand, a termination resistor 41 is connected to, for example, one selection terminal 22 of at least two selection terminals 22 included in the second switch 40. Thereby, when the diversity antenna ANT is used as an antenna for transmission, or when the power of the signal received by the diversity antenna ANT is large, the selection terminal 22 to which the second common terminal 21 and the termination resistor 41 are connected is provided. Is connected, the energy of these signals having large power can be released to the ground by the terminating resistor 41. Therefore, it is possible to suppress a circuit such as a filter or an LNA connected to the second switch 40 from being damaged or having deteriorated performance.

(Embodiment 3)
Next, the diversity switch circuit 1b according to the third embodiment will be described with reference to FIG.

  FIG. 3 is a configuration diagram illustrating an example of the diversity switch circuit 1b according to the third embodiment.

  The diversity switch circuit 1b according to the third embodiment is different from the diversity switch circuit 1a according to the second embodiment in that a matching circuit 50 is provided. Since other configurations are the same as those in the second embodiment, description thereof is omitted. In the present embodiment, the diversity switch circuit 1b includes a matching circuit 50a and a matching circuit 50b, and the matching circuit 50a and the matching circuit 50b are collectively referred to as the matching circuit 50.

  A matching circuit 50 a is connected between the first selection terminal 12 and the second common terminal 21. The matching circuit 50 b is connected between the second selection terminal 14 and the third common terminal 31. The matching circuit 50 is an impedance matching circuit configured by an element such as a capacitor or an inductor. As a result, impedance matching between the first switch 10 and the second switch 40 and impedance matching between the first switch and the fourth switch 30 are performed, and a signal transmitted to the first signal path 200 and the second signal path 300 is generated. The level of loss (return loss) can be suppressed.

  As described above, filters having different pass bands are connected to at least two selection terminals 22 of the second switch 40, respectively. That is, the frequency band in which the matching circuit 50a should perform impedance matching differs depending on the switch 23 that is turned on. For example, the matching circuit 50a is a matching circuit adjusted in advance so as to correspond to the frequency band to be impedance-matched, assuming the switch 23 to be turned on in the second switch 40. For example, when the parameter for matching of the matching circuit 50a is variable, the matching circuit 50a also receives a control signal for turning on and off the switch 23 received by the second switch 40. That is, the matching circuit 50a can recognize the switch 23 that is turned on in the second switch 40, in other words, the frequency band that should be impedance matched. In addition, the matching circuit 50a includes a plurality of circuits having different parameters such as inductors and capacitors or connection forms. It is assumed that the plurality of circuits are circuits in which parameters such as inductors and capacitors or connection forms are adjusted so that impedance matching is performed in different frequency bands. Furthermore, the matching circuit 50a includes a switch that switches a circuit connected between the first switch 10 and the second switch 40 among the plurality of circuits according to a control signal received by the matching circuit 50a. Thereby, the matching circuit 50a can perform impedance matching for each frequency band corresponding to the switch 23 turned on in the second switch 40.

  Similarly, filters having different pass bands are connected to at least two selection terminals 32 of the fourth switch 30. That is, the frequency band in which the matching circuit 50b should perform impedance matching differs depending on the switch 33 that is turned on. For example, the matching circuit 50b is a matching circuit adjusted in advance so as to correspond to the frequency band to be impedance-matched, assuming the switch 33 that is turned on in the fourth switch 30. For example, when the parameter for matching of the matching circuit 50b is variable, the matching circuit 50b also receives a control signal for turning on and off the switch 33 received by the fourth switch 30. That is, the matching circuit 50b can recognize the switch 33 that is turned on in the fourth switch 30, in other words, the frequency band that should be impedance matched. In addition, the matching circuit 50b includes a plurality of circuits having different parameters such as inductors and capacitors or connection forms. It is assumed that the plurality of circuits are circuits in which parameters such as inductors and capacitors or connection forms are adjusted so that impedance matching is performed in different frequency bands. Furthermore, the matching circuit 50b includes a switch that switches a circuit connected between the first switch 10 and the fourth switch 30 among the plurality of circuits according to a control signal received by the matching circuit 50b. Thereby, the matching circuit 50b can perform impedance matching for each frequency band corresponding to the switch 33 that is turned on in the fourth switch 30.

  As described above, the impedance matching parameter of the matching circuit 50 is adjusted in advance so as to correspond to the frequency band to be impedance matched, or the switch 23 or 33 received by the second switch 40 or the fourth switch 30 is turned on / off. It is possible to perform optimum impedance matching for each frequency band by changing in accordance with the control signal.

(Embodiment 4)
Next, the diversity switch circuit 1c according to the fourth embodiment will be described with reference to FIG.

  FIG. 4 is a configuration diagram illustrating an example of the diversity switch circuit 1c according to the fourth embodiment.

  The diversity switch circuit 1c according to the fourth embodiment includes a multiplexer 60, wherein the second switch 40 includes two or more second switches 40, and the fourth switch 30 includes two or more fourth switches 30. However, it is different from the diversity switch circuit 1a according to the second embodiment. Since other configurations are the same as those in the second embodiment, description thereof is omitted. In the present embodiment, the diversity switch circuit 1c includes a first multiplexer 60a and a second multiplexer 60b, which are collectively referred to as a multiplexer 60. The diversity switch circuit 1b includes a second switch 40a and a second switch 40b. These are collectively referred to as a second switch 40. The diversity switch circuit 1b includes a fourth switch 30a and a fourth switch 30b. This is called 4 switch 30.

  A first multiplexer 60a is connected between the first selection terminal 12 and the second common terminal 21 that each of the two or more second switches 40 has. The second multiplexer 60b is connected between the second selection terminal 14 and the third common terminal 31 included in each of the two or more fourth switches 30. For example, in the communication using the frequency division duplex (FDD) method, the multiplexer 60 divides one signal into a plurality of signals in different frequency bands, or combines a plurality of signals in different frequency bands into one signal. Filter. In the present embodiment, the multiplexer 60 is a duplexer, but may be a triplexer or a quadplexer.

  As a result, the first multiplexer 60a can simultaneously receive a plurality of received signals having different frequency bands, such as LB, MB, and HB, and thus can cope with CA. For example, LB is about 700 to 900 MHz band, MB is about 1800 to 2200 MHz band, and HB is about 2300 to 2700 MHz band. Furthermore, since the second multiplexer 60b can simultaneously transmit a plurality of transmission signals having different frequency bands, such as LB, MB, and HB, it is possible to cope with CA.

  The multiplexer 60 may be configured from a filter including an acoustic wave resonator, an LC circuit, and both. The acoustic wave resonator may be a SAW (Surface Acoustic Wave) resonator or a BAW (Bulk Acoustic Wave) resonator. In the case of a SAW resonator, the elastic wave resonator includes a substrate and an IDT (Interdigital transducer) electrode. The substrate is a substrate having piezoelectricity at least on the surface. For example, a piezoelectric thin film may be provided on the surface, and the piezoelectric thin film may have a different sound velocity from the piezoelectric thin film, and a laminated body such as a support substrate. Moreover, the board | substrate may have piezoelectricity in the whole board | substrate. In this case, the substrate is a piezoelectric substrate composed of one piezoelectric layer.

  For example, the filter constituting the multiplexer 60 may be a bandpass filter. Note that the filter constituting the multiplexer 60 is not limited to a bandpass filter, but may be a highpass filter, a lowpass filter, a band elimination filter, or the like.

(Embodiment 5)
Next, a diversity switch circuit 1d according to the fifth embodiment will be described with reference to FIG.

  FIG. 5 is a configuration diagram illustrating an example of the diversity switch circuit 1d according to the fifth embodiment.

  The diversity switch circuit 1d according to the fifth embodiment includes a first switch 100 instead of the first switch 10, a third switch 65 between the first multiplexer 60a and the second switch 40, and a second switch The difference from the diversity switch circuit 1c according to the fourth embodiment is that a fifth switch 66 is provided between the multiplexer 60b and the fourth switch 30. The first switch 100 and the first signal path 200 are connected by a plurality of paths. The first switch 100 and the second signal path 300 are connected by a plurality of paths. Since other configurations are the same as those in the fourth embodiment, description thereof is omitted.

  The first switch 100 is connected to the first common terminal 11 connected to the diversity antenna ANT, the first selection terminal 12 and the third selection terminal 16 connected to the first signal path 200, and the second signal path 300. A second selection terminal 14 and a fourth selection terminal 18. A path connecting the third selection terminal 16 and the first signal path 200 is referred to as a first bypass path. A path connecting the fourth selection terminal 18 and the second signal path 300 is referred to as a second bypass path. The first switch 100 includes a switch 13, a switch 15, a switch 17, and a switch 19. In the present embodiment, the first switch 100 has first common terminals 11a to 11f, which are collectively referred to as the first common terminal 11. The first switch 100 includes a third selection terminal 16a and a third selection terminal 16b. These are collectively referred to as a third selection terminal 16, and include a fourth selection terminal 18a and a fourth selection terminal 18b. These are collectively called the fourth selection terminal 18. The first switch 100 includes a switch 17a and a switch 17b. These are collectively referred to as a switch 17, and include a switch 19a and a switch 19b. These are collectively referred to as a switch 19.

  The third switch 65a is connected between the first multiplexer 60a and the second common terminal 21 included in each of the second switches 40a. Specifically, as shown in FIG. 5, the diversity switch circuit 1d is connected from the connection point between the path connected to the third selection terminal 16a and the path connecting the first multiplexer 60a and the second switch 40a. From the point of view, a third switch 65a is provided on the first multiplexer 60a side. Similarly, the diversity switch circuit 1d includes a third switch 65b between the first multiplexer 60a and the second switch 40b.

  The fifth switch 66a is connected between the second multiplexer 60b and the third common terminal 31 included in each of the fourth switches 30a. Specifically, as shown in FIG. 5, the diversity switch circuit 1d is connected from the connection point between the path connected to the fourth selection terminal 18a and the path connecting the second multiplexer 60b and the fourth switch 30a. From the point of view, a fifth switch 66a is provided on the second multiplexer 60b side. Similarly, the diversity switch circuit 1d includes a fifth switch 66b between the second multiplexer 60b and the fourth switch 30b. In the present embodiment, the third switch 65a and the third switch 65b are collectively referred to as a third switch 65, and the fifth switch 66a and the fifth switch 66b are collectively referred to as a fifth switch 66.

  When the switch 13, the third switch 65a, and the third switch 65b are turned on (turned on), the signal received by the diversity antenna ANT is transmitted to the first signal path 200 via the first multiplexer 60a. The When the switch 15, the fifth switch 66a, and the fifth switch 66b are turned on, a signal transmitted to the second signal path 300 is sent to the diversity antenna ANT via the second multiplexer 60b. On the other hand, when the switch 17a is turned on, the first common terminal 11c and the third selection terminal 16a are connected, and the diversity antenna ANT receives when the third switch 65a is turned off (turned off). The transmitted signal is transmitted to the first signal path 200 without passing through the first multiplexer 60a. When the switch 17b is turned on, the first common terminal 11d and the third selection terminal 16b are connected, and when the third switch 65b is turned off, the signal received by the diversity antenna ANT is the first multiplexer. It is transmitted to the first signal path 200 without going through 60a. In addition, when the switch 19a is turned on, the first common terminal 11e and the fourth selection terminal 18a are connected, and when the fifth switch 66a is turned off, a signal transmitted to the second signal path 300 is The signal is sent to the diversity antenna ANT without going through the second multiplexer 60b. When the switch 19b is turned on, the first common terminal 11f and the fourth selection terminal 18b are connected, and when the fifth switch 66b is turned off, a signal transmitted to the second signal path 300 is The signal is sent to the diversity antenna ANT without going through the second multiplexer 60b.

  For example, when the switch 13 is turned on, the switch 15, the switch 17a, the switch 17b, the switch 19a, and the switch 19b are turned off. When at least one of the switch 17a and the switch 17b is on, the switch 13, the switch 15, the switch 19a, and the switch 19b are off. When the switch 15 is on, the switch 13, the switch 17a, the switch 17b, the switch 19a, and the switch 19b are off. When at least one of the switch 19a and the switch 19b is turned on, the switch 13, the switch 15, the switch 17a, and the switch 17b are turned off. Note that when any one of the switch 13, the switch 17a, and the switch 17b is turned on, any one of the switch 15, the switch 19a, and the switch 19b may be turned on. Similarly, any one of the switch 13, the switch 17a, and the switch 17b may be turned on when any one of the switch 15, the switch 19a, and the switch 19b is turned on.

  For example, the switch 17 and the switch 19 are semiconductor switches using a diode or a field effect transistor, and are turned on and off by a control signal from the outside of the first switch 10 (for example, an RF signal processing circuit 120 described later). Similarly, the third switch 65 and the fifth switch 66 are semiconductor switches using diodes or field effect transistors, and are turned on / off by a control signal from the outside of the diversity switch circuit 1d (for example, an RF signal processing circuit 120 described later). Is done. The first common terminals 11a to 11f may be one terminal integrated with each other. In this case, instead of the switch 13, the switch 15, the switch 17, and the switch 19, the first switch 10 includes one integrated first common terminal 11, first selection terminal 12, second selection terminal 14, A switch for switching the connection between the third selection terminal 16 and the fourth selection terminal 18 is provided. However, even in this case, the connection between the one first common terminal 11 and any one of the first selection terminal 12 and the third selection terminal 16, and the one first common terminal 11, the second selection terminal 14, and the first selection terminal 16. Connection to any of the four selection terminals 18 may be made simultaneously.

  Although the multiplexer 60 can cope with CA, when the signal passes through the multiplexer 60, a loss due to passing through the multiplexer 60 occurs. For example, in the diversity switch circuit 1c shown in FIG. 4, the signal transmitted / received by the diversity antenna ANT passes through the multiplexer 60. Even if this is unnecessary, a loss occurs.

  On the other hand, in the present embodiment, the received signal received by the diversity antenna ANT is obtained when the first common terminal 11 and the third selection terminal 16 are connected and the third switch 65 is turned off. The signal is transmitted to the first signal path 200 through the first bypass path so as not to pass through the first multiplexer 60a. Further, the transmission signal transmitted by the diversity antenna ANT does not pass through the second multiplexer 60b when the first common terminal 11 and the fourth selection terminal 18 are connected and the fifth switch 66 is turned off. The signal is transmitted to the second signal path 300 through the second bypass path. As a result, the first common terminal 11 and the third selection terminal 16 are connected and the third switch 65 is turned off, so that the reception signal received by the diversity antenna ANT is not passed through the first multiplexer 60a. When the signal can be transmitted to the first signal path 200 and it is not necessary to cope with CA, it is possible to suppress the loss generated in the received signal. Further, when the first common terminal 11 and the fourth selection terminal 18 are connected and the fifth switch 66 is turned off, the transmission signal transmitted to the second signal path 300 is transmitted via the second multiplexer 60b. Therefore, when it is not necessary to cope with CA, it is possible to suppress loss that occurs in the transmission signal.

(Embodiment 6)
The diversity switch circuit of the present invention can be applied to a high-frequency module and further to a communication device. Therefore, in the sixth embodiment, the high-frequency module 110 and the communication device 130 that include the diversity switch circuit 1 will be described.

  FIG. 6 is a configuration diagram illustrating an example of the communication apparatus 130 according to the sixth embodiment.

  The communication device 130 includes a high frequency module 110 and an RF signal processing circuit (RFIC) 120.

  The high-frequency module 110 transmits and receives reception signals and transmission signals transmitted and received by the diversity antenna ANT between the diversity antenna ANT and the RF signal processing circuit 120. The high-frequency module 110 includes a diversity switch circuit 1, a plurality of filters 70 connected to at least two selection terminals 22 included in the second switch 20 and at least two selection terminals 32 included in the fourth switch 30, and a plurality of filters 70. And an amplifier circuit 80 connected to. The high-frequency module 110 includes a sixth switch 90, and the amplifier circuit 80 is connected to the filter 70 via the sixth switch 90. The high-frequency module 110 includes a switch 91, and the switch 91 is connected to the RF signal processing circuit 120 side of the sixth switch 90. Since diversity switch circuit 1 is the same as that in the first embodiment, description thereof is omitted.

  In the present embodiment, the high-frequency module 110 includes an LNA 80a and a PA 80b, and these are collectively referred to as an amplifier circuit 80. The high-frequency module 110 includes a sixth switch 90a and a sixth switch 90b, which are collectively referred to as a sixth switch 90. The high frequency module 110 includes a switch 91.

  The plurality of filters 70 are filters configured by an acoustic wave resonator, an LC circuit, or both. The acoustic wave resonator may be a SAW resonator or a BAW resonator. In the case of a SAW resonator, the acoustic wave resonator includes a substrate and an IDT electrode. The substrate is a substrate having piezoelectricity at least on the surface. For example, a piezoelectric thin film may be provided on the surface, and the piezoelectric thin film may have a different sound velocity from the piezoelectric thin film, and a laminated body such as a support substrate. Moreover, the board | substrate may have piezoelectricity in the whole board | substrate. In this case, the substrate is a piezoelectric substrate composed of one piezoelectric layer.

  For example, the plurality of filters 70 are band pass filters. The plurality of filters 70 are not limited to bandpass filters, but may be highpass filters, lowpass filters, band elimination filters, or the like. The plurality of filters 70 are filters having different passbands. By connecting the plurality of filters 70 to the selection terminal 22, the diversity switch circuit 1 can receive reception signals having different frequency bands. The plurality of filters 70 have different pass bands, for example, in the range of 700 MHz to 3.5 GHz. Further, by connecting the plurality of filters 70 to the selection terminal 32, a transmission signal selected by the fourth switch 30 from among a plurality of transmission signals in different frequency bands is transmitted from the diversity antenna ANT.

  The sixth switch 90 has a plurality of selection terminals connected to the plurality of filters 70, a common terminal connected to the amplifier circuit 80, and a common terminal connected to the switch 91. The sixth switch 90 connects the common terminal and one of the plurality of selection terminals, for example, according to a control signal from the RF signal processing circuit 120. For example, the selection terminal to which the filter 70 corresponding to the desired frequency band is connected and the common terminal connected to the amplifier circuit 80 or the common terminal connected to the switch 91 are connected.

  The LNA 80 a is a reception amplification circuit that amplifies the reception signal and outputs it to the RF signal processing circuit 120. The PA 80b is a transmission amplifier circuit that amplifies the transmission signal and outputs the amplified signal to the sixth switch 90b.

  The switch 91 is a switch that is turned on when it is not necessary to amplify the received signal. In this case, in the sixth switch 90a, the selection terminal connected to the filter 70 is connected to the selection terminal connected to the switch 91, not to the common terminal connected to the LNA 80a.

  The RF signal processing circuit 120 is a circuit that processes reception signals and transmission signals transmitted and received by the diversity antenna ANT. The RF signal processing circuit 120 processes the received signal input from the diversity antenna ANT via the first signal path 200 by down-conversion or the like, and the received signal generated by the signal processing is a baseband signal processing circuit. (Not shown). Further, the RF signal processing circuit 120 performs signal processing on the transmission signal input from the baseband signal processing circuit by up-conversion, and the diversity signal is transmitted to the transmission signal generated by the signal processing via the second signal path 300. Output to antenna ANT.

  As described above, the diversity switch circuit of the present invention may be applied to the high frequency module 110 and the communication device 130.

(Other embodiments)
Although the diversity switch circuit, the high-frequency module, and the communication device according to the embodiments have been described above, the present invention is not limited to the above-described embodiments.

  For example, in the above embodiment, the diversity switch circuit includes the fourth switch 30, but the present invention is not limited thereto, and may not be provided.

  Further, for example, in the second to fifth embodiments, the termination resistor 41 is built in the second switch 40 and connected to the selection terminal 22, but is not limited thereto, and is provided outside the second switch 40 and selected. It may be connected to the terminal 22.

  Further, for example, in Embodiments 3 to 5, the diversity switch circuit includes the second switch 40 including the termination resistor 41. However, the present invention is not limited thereto, and one selection terminal 22 of at least two selection terminals 22 is used. The second switch 20 may be provided with no termination resistor 41 connected thereto.

  Further, for example, in the third embodiment, the matching circuits 50 are connected between the first selection terminal 12 and the second common terminal 21 and between the second selection terminal 14 and the third common terminal 31, respectively. However, it is not limited to this. For example, the matching circuit 50 may be connected only between the first selection terminal 12 and the second common terminal 21 and between the second selection terminal 14 and the third common terminal 31.

  Further, for example, in the fourth and fifth embodiments, the matching circuit 50 is connected between the first selection terminal 12 and the second common terminal 21 and between the second selection terminal 14 and the third common terminal 31. It was not, but not limited to this. For example, the matching circuit 50 may be connected between at least one of the first selection terminal 12 and the second common terminal 21 and between the second selection terminal 14 and the third common terminal 31. For example, the multiplexer 60 may have the function of the matching circuit 50 (the multiplexer 60 and the matching circuit 50 may be provided integrally).

  Further, for example, in the fifth embodiment, the matching circuit 50 is not connected between the third selection terminal 16 and the second common terminal 21 and between the fourth selection terminal 18 and the third common terminal 31. However, it is not limited to this. For example, the matching circuit 50 may be connected between at least one of the third selection terminal 16 and the second common terminal 21 and between the fourth selection terminal 18 and the third common terminal 31.

  Further, for example, in the fourth and fifth embodiments, the diversity switch circuit includes the two second switches 40 and the two fourth switches 30, but the present invention is not limited thereto, and three or more second switches 40 and 3 are provided. Two or more fourth switches 30 may be provided.

  For example, in the sixth embodiment, the high frequency module 110 includes the diversity switch circuit 1, but is not limited thereto, and may include diversity switch circuits 1 a to 1 d.

  Other forms obtained by subjecting the embodiments to various modifications conceived by those skilled in the art, and forms realized by arbitrarily combining the components and functions in the embodiments without departing from the spirit of the present invention. Are also included in the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be widely used in communication devices such as portable terminals as a diversity switch circuit, a high-frequency module, and a communication device that can use a diversity antenna as a shared antenna.

1, 1a to 1d, 400 Diversity switch circuit 10, 100 First switch 11, 11a to 11f First common terminal 12 First selection terminal 13, 15, 17, 17a, 17b, 19, 19a, 19b, 23, 23a 23n, 33, 33a to 33n, 91, 91a, 91b, 423a to 423n Switch 14 Second selection terminal 16, 16a, 16b Third selection terminal 18, 18a, 18b Fourth selection terminal 20, 40, 40a, 40b Second Switch 21, 21a-21n Second common terminal 22, 22a-22n, 32, 32a-32n Selection terminal 30, 30a, 30b Fourth switch 31, 31a-31n Third common terminal 41 Termination resistor 50, 50a, 50b Matching circuit 60, 60a, 60b Multiplexer 65, 65a, 65b Third switch 66, 66a, 66b 5th switch 70 Filter 80 Amplifier circuit 80a LNA
80b PA
90, 90a, 90b Sixth switch 110 High-frequency module 120 RF signal processing circuit 130 Communication device 200 First signal path 300 Second signal path 420 Switch circuit

Claims (11)

A first common terminal connected to the diversity antenna, a first selection terminal connected to the first signal path, and a second selection terminal connected to a second signal path that is different from the first signal path. A first switch having,
A second common terminal provided in the first signal path and connected to the first selection terminal, and a second switch having at least two selection terminals;
A reception signal received by the diversity antenna is transmitted to the first signal path when the first common terminal and the first selection terminal are connected,
A transmission signal transmitted from the diversity antenna is transmitted to the second signal path when the first common terminal and the second selection terminal are connected. Diversity switch circuit. The diversity switch circuit according to claim 1, wherein a termination resistor is connected to one selection terminal of at least two selection terminals included in the second switch. The diversity switch circuit according to claim 1, wherein a matching circuit is connected between the first selection terminal and the second common terminal. The second switch is composed of two or more second switches,
The diversity switch circuit according to any one of claims 1 to 3, wherein a first multiplexer is connected between the first selection terminal and the second common terminal of each of the two or more second switches. . The first switch further includes a third selection terminal connected to the first signal path,
A third switch is connected between the first multiplexer and the second common terminal;
The received signal received by the diversity antenna is not connected to the first multiplexer when the first common terminal and the third selection terminal are connected and the third switch is turned off. The diversity switch circuit according to claim 4, wherein the diversity switch circuit is transmitted to the first signal path. Furthermore, it is provided with the 4th switch which is provided in the said 2nd signal path | route, and has a 3rd common terminal connected to the said 2nd selection terminal, and an at least 2 selection terminal. The diversity switch circuit described. The diversity switch circuit according to claim 6, wherein a matching circuit is connected between the second selection terminal and the third common terminal. The fourth switch is composed of two or more fourth switches,
The diversity switch circuit according to claim 6, wherein a second multiplexer is connected between the second selection terminal and the third common terminal of each of the two or more fourth switches. The first switch further includes a fourth selection terminal connected to the second signal path,
A fifth switch is connected between the second multiplexer and the third common terminal;
The transmission signal transmitted by the diversity antenna is not transmitted through the second multiplexer when the first common terminal and the fourth selection terminal are connected and the fifth switch is turned off. The diversity switch circuit according to claim 8, which is transmitted to the second signal path. The diversity switch circuit according to any one of claims 1 to 9,
A filter connected to at least two selection terminals of the second switch;
An amplifier circuit connected to the filter. An RF signal processing circuit for processing the reception signal and the transmission signal;
A high-frequency module according to claim 10, wherein the reception signal and the transmission signal are transmitted and received between the diversity antenna and the RF signal processing circuit.

Images