High frequency signal transceiver circuit

Abstract

A high-frequency signal transceiver circuit is provided to suppress the increase in circuit size. The high-frequency signal transceiver circuit is a high-frequency signal transceiver circuit for transmitting SRS signals, comprising: a transceiver antenna terminal; a TRX switch that switches between a path from an amplifier amplifying the transmitted signal to the transceiver antenna terminal and a path from the amplifier to a switching switch; a receiving antenna; and a receiving circuit, wherein the receiving circuit includes a receiving antenna terminal, an amplification section for amplifying the received signal, and a bypass switch, the switching switch being connected between the TRX switch and the receiving circuit, and the SRS signal input via the bypass switch being transmitted via the receiving antenna terminal through the switching switch.

Description

Technical Field

[0001] This disclosure relates to a high-frequency signal transceiver circuit. Background Technology

[0002] SRS (Sound Reference Signaling) is performed in a mobile communication device, exemplified by a portable telephone. Regarding SRS, an SRS signal is transmitted from the mobile communication device, and the power and delay of the transmission path between each antenna port within the mobile communication device and the base station are monitored. The SRS signal is the signal that conveys transmitted information from the mobile communication device to the base station.

[0003] Patent Document 1 discloses a mobile communication device including a high-frequency signal transceiver circuit for transmitting SRS signals. The high-frequency signal transceiver circuit disclosed in Patent Document 1 has a low-noise amplifier that amplifies the signal received by the receiving antenna. When transmitting SRS signals, the device is switched to a state that bypasses the low-noise amplifier by setting a switching switch, and the SRS signal is transmitted using the receiving antenna.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2020-182205 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] In the mobile communication device disclosed in the aforementioned Patent Document 1, a switching switch is required to bypass the low-noise amplifier, which sometimes results in a larger circuit size.

[0009] This disclosure was made in view of the above circumstances, and its object is to provide a high-frequency signal transceiver circuit that can transmit SRS signals using a receiving antenna without increasing the circuit size.

[0010] Solution for solving the problem

[0011] To address the aforementioned problems and achieve the objective, one aspect of this disclosure is a high-frequency signal transceiver circuit for transmitting SRS signals, comprising: a transceiver antenna terminal; a TRX switch for switching between a path from an amplifier amplifying the transmitted signal to the transceiver antenna terminal and a path from the amplifier to a switching switch; a receiving antenna; and a receiving circuit, wherein the receiving circuit comprises a receiving antenna terminal, an amplification section for amplifying the received signal, and a bypass switch, the switching switch being connected between the TRX switch and the receiving circuit, and the SRS signal input via the bypass switch being transmitted via the receiving antenna terminal through the switching switch.

[0012] The effects of the invention

[0013] According to this disclosure, by inputting an SRS signal between the receiving antenna and the amplification section, it is possible to suppress the increase in circuit size. Attached Figure Description

[0014] Figure 1 This is a diagram showing the structure of the high-frequency signal transceiver circuit of the comparative example.

[0015] Figure 2 This is a diagram illustrating the operation of the high-frequency signal transceiver circuit of the comparative example.

[0016] Figure 3 This is a diagram showing the structure of the high-frequency signal transceiver circuit according to the first embodiment.

[0017] Figure 4 This is a diagram illustrating the operation of the high-frequency signal transceiver circuit according to the first embodiment.

[0018] Figure 5 This is a diagram illustrating an example of the transmission path of an SRS signal.

[0019] Figure 6 This is a diagram showing the structure of the high-frequency signal transceiver circuit according to the second embodiment.

[0020] Figure 7 This is a diagram showing the structure of the high-frequency signal transceiver circuit according to the third embodiment.

[0021] Figure 8 This is a diagram illustrating the operation of the high-frequency signal transceiver circuit according to the third embodiment.

[0022] Figure 9 This is a diagram showing the structure of the high-frequency signal transceiver circuit according to the fourth embodiment. Detailed Implementation

[0023] Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings. In the following descriptions of each embodiment, the same reference numerals are used to denote the same or equivalent components as in other embodiments, and their descriptions are simplified or omitted. The present invention is not limited to each embodiment. Furthermore, the constituent elements of each embodiment include constituent elements that can be easily substituted by those skilled in the art, or substantially the same constituent elements. In addition, the structures described below can be appropriately combined. Furthermore, structural omissions, substitutions, or modifications can be made without departing from the spirit of the invention.

[0024] <First Implementation Method>

[0025] The first embodiment will now be described, but for ease of understanding of the first embodiment, a comparative example will be described first.

[0026] (Comparative Example)

[0027] Figure 1 This is a diagram showing the structure of the comparative example's high-frequency signal transceiver circuit 1. The comparative example's high-frequency signal transceiver circuit 1 includes modules M1, M11, and M12. Module M1 is electrically connected to antennas ANT1 and ANT2. Module M11 is electrically connected to antenna ANT3. Module M12 is electrically connected to antenna ANT4.

[0028] The high-frequency signal transceiver circuit 1 supports 2T4R (transmitting radio waves from antennas ANT1 and ANT2 and receiving radio waves using antennas ANT1, ANT2, ANT3, and ANT4) in normal communication. In this disclosure, normal communication refers to communication of user data, voice, etc., and is communication of signals other than SRS (Sound Reference Signaling). Hereinafter, signals other than SRS signals that should be transmitted are referred to as normal transmission signals. The high-frequency signal transceiver circuit 1 transmits SRS signals when no normal transmission signals are being transmitted.

[0029] In SRS communication, the high-frequency signal transceiver circuit 1 transmits radio waves from antenna ANT3 or ANT4. Normally, antennas ANT3 and ANT4 are dedicated to receiving signals, but in SRS, they are used to transmit signals output from power amplifier PA1 to monitor the communication status and losses between these antennas and the base station.

[0030] Module M1 includes terminals R1, R2, T1, P1, and P2; power amplifier PA1; low-noise amplifiers LA1 and LA2; attenuators A1 and A2; switch groups S1 and S2; bandpass filters F1, F11, and F21; TRX switches 11 and 12; and control ICs 10, 110, and 120. Switch group S1 includes switches S11, S12, S13, and S14. Switch group S2 includes switches S21, S22, S23, and S24.

[0031] The input terminal of power amplifier PA1 is electrically connected to terminal T1. The output terminal of power amplifier PA1 is electrically connected to one end of bandpass filter F1. The other end of bandpass filter F1 is connected to TRX switch 11.

[0032] Terminal R1 is electrically connected to one end of switch S11 and one end of switch S12. The other end of switch S11 is electrically connected to the output terminal of low-noise amplifier LA1. The input terminal of low-noise amplifier LA1 is electrically connected to one end of switch S21. The other end of switch S12 is electrically connected to one end of attenuator A1. The other end of attenuator A1 is electrically connected to one end of switch S22. The other ends of switches S21 and S22 are electrically connected to one end of bandpass filter F11. The other end of bandpass filter F11 is connected to TRX switch 11.

[0033] Terminal R2 is electrically connected to one end of switch S13 and one end of switch S14. The other end of switch S13 is electrically connected to the output terminal of low-noise amplifier LA2. The input terminal of low-noise amplifier LA2 is electrically connected to one end of switch S23. The other end of switch S14 is electrically connected to one end of attenuator A2. The other end of attenuator A2 is electrically connected to one end of switch S24. The other ends of switches S23 and S24 are electrically connected to one end of bandpass filter F21. The other end of bandpass filter F21 is connected to TRX switch 11.

[0034] The passband of bandpass filter F21 is the same as that of bandpass filter F11, but this disclosure is not limited thereto.

[0035] Each switch in switch group S1 is in an ON or OFF state based on the control signal Sig11 input from control IC 10. Each switch in switch group S2 is in an ON or OFF state based on the control signal Sig21 input from control IC 10.

[0036] TRX switch 11 is connected to antenna ANT1 via terminal P1 and to ANT2 via terminal P2. Additionally, one end of TRX switch 11 is connected to switch 12. TRX switch 11 is a switch that electrically connects antennas ANT1 and ANT2, and switch 12 to bandpass filters F1, F11, and F21 during transmit and receive operations. TRX switch 11 electrically connects antennas ANT1 and ANT2 to bandpass filters F1, F11, and F21 based on the control signal Sig1 input from control IC 110. TRX switch 11 is equivalent to the TRX switch 11 of this disclosure.

[0037] Modules M11 and M12 are connected to the other end of switch 12. Switch 12 sets the connection destination of the other end to module M11 or M12 based on the control signal Sig2 input from control IC 120.

[0038] Module M11 includes terminals R3 and P3, switch 13, switch group S3a, low-noise amplifier LA3, attenuator A3, switch group S3b, bandpass filter F31, and control IC 30a. Switch group S3a includes switches S31 and S32. Switch group S3b includes switches S33 and S34. Low-noise amplifier LA3 corresponds to the amplification section of this disclosure. Switch S31 corresponds to the output-side switch of this disclosure. Switch S33 corresponds to the input-side switch of this disclosure. In module M11, bandpass filter F31 is disposed between low-noise amplifier LA3 and terminal P3.

[0039] Terminal R3 is electrically connected to one terminal of switch 13. The other terminals of switch 13 are connected to switch 12 of module M1.

[0040] One end of switch S31 and one end of switch S32 are connected to switch 13. The other end of switch S31 is electrically connected to the output terminal of low-noise amplifier LA3. The input terminal of low-noise amplifier LA3 is electrically connected to one end of switch S33. The other end of switch S32 is electrically connected to one end of attenuator A3. The other end of attenuator A3 is electrically connected to one end of switch S34. The other ends of switches S33 and S34 are electrically connected to one end of bandpass filter F31. The other end of bandpass filter F31 is electrically connected to antenna ANT3 via terminal P3. Terminal P3 corresponds to the receiving antenna terminal of this disclosure.

[0041] Switch 13 sets the connection to module M11 or terminal R3 based on the control signal Sig30 input from control IC 30a. Each switch in switch group S3a becomes either ON or OFF based on the control signal Sig31 input from control IC 30a. Each switch in switch group S3b becomes either ON or OFF based on the control signal Sig32 input from control IC 30a.

[0042] Module M12 includes terminals R4 and P4, switch 14, switch group S4a, low-noise amplifier LA4, attenuator A4, switch group S4b, bandpass filter F41, and control IC 40a. Switch group S4a includes switches S41 and S42. Switch group S4b includes switches S43 and S44. Low-noise amplifier LA4 corresponds to the amplification section of this disclosure. Switch S41 corresponds to the output-side switch of this disclosure. Switch S43 corresponds to the input-side switch of this disclosure. In module M12, bandpass filter F41 is disposed between low-noise amplifier LA4 and terminal P4.

[0043] Terminal R4 is electrically connected to one terminal of switch 14. The other terminals of switch 14 are connected to switch 12 of module M1.

[0044] One end of switch S41 and one end of switch S42 are connected to switch 14. The other end of switch S41 is electrically connected to the output terminal of low-noise amplifier LA4. The input terminal of low-noise amplifier LA4 is electrically connected to one end of switch S43. The other end of switch S42 is electrically connected to one end of attenuator A4. The other end of attenuator A4 is electrically connected to one end of switch S44. The other ends of switches S43 and S44 are electrically connected to one end of bandpass filter F41. The other end of bandpass filter F41 is electrically connected to antenna ANT4 via terminal P4. Terminal P4 corresponds to the receiving antenna terminal of this disclosure.

[0045] Switch 14 sets the connection to module M11 or terminal R4 based on the control signal Sig40 input from control IC 40a. Each switch in switch group S4a becomes either ON or OFF based on the control signal Sig41 input from control IC 40a. Each switch in switch group S4b becomes either ON or OFF based on the control signal Sig42 input from control IC 40a.

[0046] Figure 2 This is a diagram illustrating the operation of the high-frequency signal transceiver circuit 1 in the comparative example. Figure 2 This is a diagram showing the parts within modules M1, M11, and M12 through which the high-frequency signal passes in the case of (T) transmission and (R) reception.

[0047] The transmission scenarios (T) include: (T-1) Transmission by antenna ANT1 (normal), (T-2) Transmission by antenna ANT2 (normal), (T-3) Transmission by antenna ANT3 (SRS), and (T-4) Transmission by antenna ANT4 (SRS).

[0048] (R) The reception scenarios include: (R-1-1) reception by antenna ANT1 (normal), (R-1-2) reception by antenna ANT1 (high input), (R-2-1) reception by antenna ANT2 (normal), (R-2-2) reception by antenna ANT2 (high input), (R-3-1) reception by antenna ANT3 (normal), (R-3-2) reception by antenna ANT3 (high input), (R-4-1) reception by antenna ANT4 (normal), and (R-4-2) reception by antenna ANT4 (high input).

[0049] The following describes the case of transmission (T-1) by antenna ANT1 (normal). The third row 203 in Table 200 indicates the part of the high-frequency signal transceiver circuit 1 through which the high-frequency transmission signal TXin passes in the case of transmission (normal) by antenna ANT1.

[0050] In the normal transmission mode (ANT1), TRX switch 11 is connected to antenna ANT1 based on control signal Sig1. When the high-frequency transmission signal TXin is input to terminal T1 on the left side of module M1, power amplifier PA1 amplifies and outputs the high-frequency transmission signal TXin. The amplified high-frequency transmission signal TXin is input to bandpass filter F1. Bandpass filter F1 allows the high-frequency transmission signal TXin to pass through its passband. The high-frequency transmission signal TXin after passing through bandpass filter F1 is input to TRX switch 11. The high-frequency transmission signal TXin after passing through TRX switch 11 is output to antenna ANT1.

[0051] The following describes the normal transmission case (T-2) performed by antenna ANT2. The sixth row, 206, in Table 200 indicates the location within the high-frequency transceiver circuit 1 through which the high-frequency transmitted signal TXin passes during the normal transmission case performed by antenna ANT2.

[0052] In the normal transmission mode (ANT1), TRX switch 11 is connected to antenna ANT2 based on control signal Sig1. When the high-frequency transmission signal TXin is input to terminal T1 on the left side of module M1, power amplifier PA1 amplifies and outputs the high-frequency transmission signal TXin. The amplified high-frequency transmission signal TXin is input to bandpass filter F1. Bandpass filter F1 allows the high-frequency transmission signal TXin to pass through its passband. The high-frequency transmission signal TXin after passing through bandpass filter F1 is input to TRX switch 11. The high-frequency transmission signal TXin after passing through TRX switch 11 is output to antenna ANT2.

[0053] The case of transmission (SRS) by antenna ANT3 (T-3) will be explained. The ninth row 209 in Table 200 indicates the part of the high-frequency signal transceiver circuit 1 through which the high-frequency transmission signal TXin, which is the SRS signal, passes when transmission (SRS) is performed by antenna ANT3.

[0054] When the high-frequency transmission signal TXin, which serves as the SRS signal, is input to terminal T1 on the left side of module M1, power amplifier PA1 amplifies and outputs the high-frequency transmission signal TXin. The amplified SRS signal is then input to bandpass filter F1. Bandpass filter F1 allows the SRS signal to pass through its passband. The SRS signal after passing through bandpass filter F1 is then input to TRX switch 11.

[0055] In the case of transmission (SRS) by antenna ANT3, TRX switch 11 is set based on control signal Sig1, and switch 12 is set based on control signal Sig2, so that the SRS signal is input to module M11.

[0056] In module M11, switch 13 is set based on control signal Sig30, switch S32 is turned on and switch S31 is turned off based on control signal Sig31, and switch S34 is turned on and switch S33 is turned off based on control signal Sig32. Thus, the SRS signal is input to bandpass filter F31 through attenuator A3. Bandpass filter F31 allows the SRS signal to pass through its passband. The SRS signal after passing through bandpass filter F31 is output to antenna ANT3. Furthermore, the attenuation of attenuator A3 is set to a value that does not attenuate the passed SRS signal.

[0057] The above transmission path is Figure 1 The path is shown by the dashed arrow 100. That is, as shown by the dashed arrow 100, the SRS transmitted signal is transmitted through the following path: terminal T1 → power amplifier PA1 → bandpass filter F1 → TRX switch 11 → switch 12 → switch 13 → switch S32 → attenuator A3 → switch S34 → bandpass filter F31 → antenna ANT3.

[0058] The case of transmission (SRS) by antenna ANT4 (T-4) is explained. The twelfth row 212 in Table 200 indicates the part of the high-frequency signal transceiver circuit 1 through which the high-frequency transmission signal TXin, which is the SRS signal, passes in the case of transmission (SRS) by antenna ANT4.

[0059] When the high-frequency transmission signal TXin, which serves as the SRS signal, is input to terminal T1 on the left side of module M1, power amplifier PA1 amplifies and outputs the high-frequency transmission signal TXin. The amplified SRS signal is then input to bandpass filter F1. Bandpass filter F1 allows the SRS signal to pass through its passband. The SRS signal after passing through bandpass filter F1 is then input to TRX switch 11.

[0060] In the case of transmission (SRS) by antenna ANT4, TRX switch 11 is set based on control signal Sig1, and switch 12 is set based on control signal Sig2, so that the SRS signal is input to module M12.

[0061] In module M12, switch 14 is set based on control signal Sig40, switch S42 is turned on and switch S41 is turned off based on control signal Sig41, and switch S44 is turned on and switch S43 is turned off based on control signal Sig42. Thus, the SRS signal is input to bandpass filter F41 through attenuator A4. Bandpass filter F41 allows the SRS signal to pass through its passband. The SRS signal after passing through bandpass filter F41 is output to antenna ANT4. Furthermore, the attenuation of attenuator A4 is set to a value that does not attenuate the passed SRS signal.

[0062] The reception (normal) case by antenna ANT1 (R-1-1) will be explained. The first row 201 in Table 200 indicates the part of the high-frequency signal transceiver circuit 1 through which the high-frequency received signal passes in the case of reception (normal) by antenna ANT1.

[0063] In the normal reception mode using antenna ANT1, TRX switch 11 is set based on control signal Sig1, switch S11 is turned on based on control signal Sig11, and switch S21 is turned on based on control signal Sig21. Switch S12 is turned off based on control signal Sig11, and switch S22 is turned off based on control signal Sig21. When a high-frequency received signal is input from antenna ANT1, the high-frequency received signal is input to bandpass filter F11 through TRX switch 11. Bandpass filter F11 allows the high-frequency received signal to pass through its passband. The high-frequency received signal after passing through bandpass filter F11 is input to low-noise amplifier LA1 through switch S21. Low-noise amplifier LA1 amplifies the high-frequency received signal after passing through switch S21. The high-frequency received signal amplified by low-noise amplifier LA1 is output from terminal R1 as high-frequency received signal RXout1 through switch S11.

[0064] The reception (when high input) by antenna ANT1 (R-1-2) will be explained. The second row 202 in Table 200 indicates the part of the high-frequency signal transceiver circuit 1 through which the high-frequency received signal passes when the reception is performed by antenna ANT1 (when high input).

[0065] When receiving signals from antenna ANT1 (high input), TRX switch 11 is set based on control signal Sig1, switch S12 is turned on based on control signal Sig11, and switch S22 is turned on based on control signal Sig21. Switch S11 is turned off based on control signal Sig11, and switch S21 is turned off based on control signal Sig21. When a high-frequency received signal is input from antenna ANT1, the high-frequency received signal is input to bandpass filter F11 through TRX switch 11. Bandpass filter F11 allows the high-frequency received signal to pass through its passband. The high-frequency received signal after passing through bandpass filter F11 is input to attenuator A1 through switch S22. Attenuator A1 attenuates the high-frequency received signal after passing through switch S22 to an appropriate level. The high-frequency received signal attenuated by attenuator A1 is output from terminal R1 as high-frequency received signal RXout1 through switch S12. The attenuation amount of attenuator A1 is set according to a control signal from a control circuit (not shown).

[0066] The reception (normal) case by antenna ANT2 (R-2-1) will be explained. The fourth row 204 in Table 200 indicates the part of the high-frequency signal transceiver circuit 1 through which the high-frequency received signal passes in the case of reception (normal) by antenna ANT2.

[0067] In the normal reception mode using antenna ANT2, TRX switch 11 is set based on control signal Sig1, switch S13 is turned on based on control signal Sig11, and switch S23 is turned on based on control signal Sig21. Switch S14 is turned off based on control signal Sig11, and switch S24 is turned off based on control signal Sig21. When a high-frequency received signal is input from antenna ANT2, the high-frequency received signal is input to bandpass filter F21 through TRX switch 11. Bandpass filter F21 allows the high-frequency received signal to pass through its passband. The high-frequency received signal after passing through bandpass filter F21 is input to low-noise amplifier LA2 through switch S23. Low-noise amplifier LA2 amplifies the high-frequency received signal after passing through switch S23. The high-frequency received signal amplified by low-noise amplifier LA2 is output from terminal R2 as high-frequency received signal RXout2 through switch S13.

[0068] The reception (high input) by antenna ANT2 (R-2-2) is explained. The fifth row 205 in Table 200 indicates the part of the high-frequency signal transceiver circuit 1 through which the high-frequency received signal passes when receiving by antenna ANT2 (high input).

[0069] When receiving signals from antenna ANT2 (high input), TRX switch 11 is set based on control signal Sig1, switch S14 is turned on based on control signal Sig11, and switch S24 is turned on based on control signal Sig21. Switch S13 is turned off based on control signal Sig11, and switch S23 is turned off based on control signal Sig21. When a high-frequency received signal is input from antenna ANT2, the high-frequency received signal is input to bandpass filter F21 through TRX switch 11. Bandpass filter F21 allows the high-frequency received signal to pass through its passband. The high-frequency received signal after passing through bandpass filter F21 is input to attenuator A2 through switch S24. Attenuator A2 attenuates the high-frequency received signal after passing through switch S24 to an appropriate level. The high-frequency received signal attenuated by attenuator A2 is output from terminal R2 as high-frequency received signal RXout2 through switch S14. The attenuation amount of attenuator A2 is set according to a control signal from a control circuit (not shown).

[0070] The reception (normal) case by antenna ANT3 (R-3-1) will be explained. The seventh row 207 in Table 200 indicates the part of the high-frequency signal transceiver circuit 1 through which the high-frequency received signal passes in the case of reception (normal) by antenna ANT3.

[0071] In the normal receiving mode using antenna ANT3, switch 13 is set based on control signal Sig30, switch S31 is turned on based on control signal Sig31, and switch S33 is turned on based on control signal Sig32. Switch S32 is turned off based on control signal Sig31, and switch S24 is turned off based on control signal Sig32. When a high-frequency receiving signal is input from antenna ANT3, the high-frequency receiving signal is input to bandpass filter F31. Bandpass filter F31 allows the high-frequency receiving signal to pass through its passband. The high-frequency receiving signal after passing through bandpass filter F31 is input to low-noise amplifier LA3 through switch S33. Low-noise amplifier LA3 amplifies the high-frequency receiving signal after passing through switch S33. The high-frequency receiving signal amplified by low-noise amplifier LA3 is output from terminal R3 as high-frequency receiving signal RXout3 through switches S31 and 13.

[0072] The reception (high input) by antenna ANT3 (R-3-2) will be explained. The eighth row 208 in Table 200 indicates the part of the high-frequency signal transceiver circuit 1 through which the high-frequency received signal passes when receiving by antenna ANT3 (high input).

[0073] When receiving signals from antenna ANT3 (high input), switch 13 is set based on control signal Sig30, switch S32 is turned on based on control signal Sig31, and switch S34 is turned on based on control signal Sig32. Switch S31 is turned off based on control signal Sig31, and switch S33 is turned off based on control signal Sig32. When a high-frequency received signal is input from antenna ANT3, the high-frequency received signal is input to bandpass filter F31. Bandpass filter F31 allows the high-frequency received signal to pass through its passband. The high-frequency received signal after passing through bandpass filter F31 is input to attenuator A3 through switch S34. Attenuator A3 attenuates the high-frequency received signal after passing through switch S34 to an appropriate level. The high-frequency received signal attenuated by attenuator A3 is output from terminal R3 as high-frequency received signal RXout3 through switches S32 and 13. The attenuation amount of attenuator A3 is set according to a control signal from a control circuit (not shown).

[0074] The reception (normal) case by antenna ANT4 (R-4-1) will be explained. The tenth row 210 in Table 200 indicates the part of the high-frequency signal transceiver circuit 1 through which the high-frequency received signal passes in the case of reception (normal) by antenna ANT4.

[0075] In the normal reception mode using antenna ANT4, switch 14 is set based on control signal Sig40, switch S41 is turned on based on control signal Sig41, and switch S43 is turned on based on control signal Sig42. Switch S42 is turned off based on control signal Sig41, and switch S44 is turned off based on control signal Sig42. When a high-frequency received signal is input from antenna ANT4, the high-frequency received signal is input to bandpass filter F41. Bandpass filter F41 allows the high-frequency received signal to pass through its passband. The high-frequency received signal after passing through bandpass filter F41 is input to low-noise amplifier LA4 through switch S43. Low-noise amplifier LA4 amplifies the high-frequency received signal after passing through switch S43. The high-frequency received signal amplified by low-noise amplifier LA4 is output from terminal R4 as high-frequency received signal RXout4 through switches S41 and 14.

[0076] The reception (high input) by antenna ANT4 (R-4-2) is explained. The eleventh row 211 in Table 200 indicates the part of the high-frequency signal transceiver circuit 1 through which the high-frequency received signal passes when receiving by antenna ANT4 (high input).

[0077] When receiving signals from antenna ANT4 (high input), switch 14 is set based on control signal Sig40, switch S42 is turned on based on control signal Sig41, and switch S44 is turned on based on control signal Sig42. Switch S41 is turned off based on control signal Sig41, and switch S43 is turned off based on control signal Sig42. When a high-frequency received signal is input from antenna ANT4, the high-frequency received signal is input to bandpass filter F41. Bandpass filter F41 allows the high-frequency received signal to pass through its passband. The high-frequency received signal after passing through bandpass filter F41 is input to attenuator A4 through switch S44. Attenuator A4 attenuates the high-frequency received signal after passing through switch S44 to an appropriate level. The high-frequency received signal attenuated by attenuator A4 is output from terminal R4 as high-frequency received signal RXout4 through switches S42 and 14. The attenuation amount of attenuator A4 is set according to a control signal from a control circuit (not shown).

[0078] (First Implementation)

[0079] Figure 3 This is a diagram illustrating the structure of the high-frequency signal transceiver circuit 1a according to the first embodiment. The high-frequency signal transceiver circuit 1a includes modules M1, M2, and M3. In the high-frequency signal transceiver circuit 1a, compared with the reference... Figure 1 The difference in the comparative example of the high-frequency signal transceiver circuit 1 is that modules M2 and M3 are used instead of modules M11 and M12. Modules M2 and M3 correspond to the receiving circuit of this disclosure. Terminals P3 and P4 correspond to the receiving antenna terminals of this disclosure. The power amplifier PA1 of module M1 corresponds to the amplifier of this disclosure. Terminals P1 and P2 of module M1 correspond to the transceiver antenna terminals of this disclosure. The TRX switch 11 of module M1 corresponds to the TRX switch of this disclosure.

[0080] The same reference numerals are used for the components of the high-frequency signal transceiver circuit 1a that are identical to those in the comparative example's high-frequency signal transceiver circuit 1, and descriptions are omitted where appropriate. Module M1 has the same structure as the comparative example's high-frequency signal transceiver circuit 1. Module M1 corresponds to the signal output section of this disclosure.

[0081] Figure 3 The high-frequency signal transceiver circuit 1a shown does not have a reference. Figure 1 The high-frequency signal transceiver circuit 1 is described with switches 13 and 14. In addition, the high-frequency signal transceiver circuit 1a has switch groups S3c and S4c to replace the switch groups S3b and S4b of the high-frequency signal transceiver circuit 1.

[0082] In addition to switches S33 and S34, switch group S3c also includes switch S35. One end of switch S35 is connected to switch 12, and an SRS signal is input to one end of switch S35. The other end of switch S35 is connected between the other ends of switches S33 and S34 and one end of bandpass filter F31. Each switch in switch group S3c is in an on or off state based on the control signal Sig32 input from control IC 30. Switch S35 is equivalent to the bypass switch of this disclosure. Switch 12 is equivalent to the toggle switch of this disclosure. Bandpass filter F31 is disposed between low-noise amplifier LA3, which serves as an amplification section, and terminal P3. Bandpass filter F31 has a passband that includes the high-frequency transmitted signal TXin. Bandpass filter F31 is equivalent to the filter of this disclosure.

[0083] In addition to switches S43 and S44, switch group S4c also includes switch S45. One end of switch S45 is connected to switch 12, and an SRS signal is input to one end of switch S45. The other end of switch S45 is connected between the other ends of switches S43 and S44 and one end of bandpass filter F41. Each switch in switch group S4c is in an on or off state based on the control signal Sig42 input from control IC 40. Switch S45 is equivalent to the bypass switch of this disclosure. Bandpass filter F41 is disposed between low-noise amplifier LA4, which serves as an amplification section, and terminal P4. Bandpass filter F41 has a passband that includes the high-frequency transmitted signal TXin. Bandpass filter F41 is equivalent to the filter of this disclosure.

[0084] Based on the above structure, by switching switch 12 according to control signal Sig2, the SRS signal output from TRX switch 11 can be input to module M2. The SRS signal input to module M2 is transmitted from antenna ANT3 via switch S35 and bandpass filter F31. Furthermore, by switching switch 12 according to control signal Sig2, the SRS signal output from TRX switch 11 can be input to module M3. The SRS signal input to module M3 is transmitted from antenna ANT4 via switch S45 and bandpass filter F41. In other words, switch 12 is used to select the connection between any one of the multiple receiving circuits M2 and M3 and TRX switch 11. Moreover, switch 12 is used to input an SRS signal between one of terminals P3 and P4 and the amplifier LA3 corresponding to terminal P3 or the amplifier LA4 corresponding to terminal P4. Thus, the SRS signal is amplified in the power amplifier PA1 that amplifies the transmitted signal, and is transmitted via terminal P3 or P4 through TRX switch 11, switch 12, bypass switch S35 or S45 instead of through the low-noise amplifiers LA3 and LA4 that amplify the received signal.

[0085] Figure 4This is a diagram illustrating the operation of the high-frequency signal transceiver circuit 1a according to the first embodiment. Figure 4 This is a diagram showing the parts within modules M1, M2, and M3 through which the high-frequency signal passes in the case of (T) transmission and (R) reception.

[0086] The transmission scenarios (T) include: (T-1) Transmission by antenna ANT1 (normal), (T-2) Transmission by antenna ANT2 (normal), (T-3) Transmission by antenna ANT3 (SRS), and (T-4) Transmission by antenna ANT4 (SRS).

[0087] (R) The reception scenarios include: (R-1-1) reception by antenna ANT1 (normal), (R-1-2) reception by antenna ANT1 (high input), (R-2-1) reception by antenna ANT2 (normal), (R-2-2) reception by antenna ANT2 (high input), (R-3-1) reception by antenna ANT3 (normal), (R-3-2) reception by antenna ANT3 (high input), (R-4-1) reception by antenna ANT4 (normal), and (R-4-2) reception by antenna ANT4 (high input).

[0088] In the case of transmission (T-1) by antenna ANT1 (normal), the third row 403 in Table 400 indicates the location within the high-frequency signal transceiver circuit 1a through which the high-frequency received signal passes in the case of transmission (normal) by antenna ANT1. In this case, the operation of module M1 is the same as that of the high-frequency signal transceiver circuit 1 in the comparative example.

[0089] In the case of transmission (T-2) by antenna ANT2 (normal), the sixth row 406 in Table 400 indicates the location within the high-frequency signal transceiver circuit 1a through which the high-frequency received signal passes in the case of transmission (normal) by antenna ANT2. In this case, the operation of module M1 is the same as that of the high-frequency signal transceiver circuit 1 in the comparative example.

[0090] The case of transmission (SRS) by antenna ANT3 (T-3) is explained. The ninth row 409 in Table 400 indicates the part of the high-frequency signal transceiver circuit 1a through which the high-frequency transmission signal TXin, which is the SRS signal, passes when transmission (SRS) is performed by antenna ANT3.

[0091] When the high-frequency transmission signal TXin, which serves as the SRS signal, is input to terminal T1 on the left side of module M1, power amplifier PA1 amplifies and outputs the high-frequency transmission signal TXin. The amplified SRS signal is then input to bandpass filter F1. Bandpass filter F1 allows the SRS signal to pass through its passband. The SRS signal after passing through bandpass filter F1 is then input to TRX switch 11.

[0092] In the case of transmission (SRS) by antenna ANT3, TRX switch 11 is set based on control signal Sig1, and switch 12 is set based on control signal Sig2, so that the SRS signal is input to module M2.

[0093] In module M2, control signal Sig32 turns switch S35 on and switches S33 and S34 off. As a result, the SRS signal is input to bandpass filter F31. That is, the SRS signal is input to bandpass filter F31, which is located close to antenna ANT3 of module M3. This input location differs from the comparative example. Bandpass filter F31 allows the SRS signal to pass through its passband. The SRS signal after passing through bandpass filter F31 is then output to antenna ANT3.

[0094] Figure 5 This diagram illustrates an example of the transmission path of an SRS signal. In the case of transmitting an SRS signal from antenna ANT3, it becomes... Figure 5 The path is shown by the dashed arrow 101. That is, as shown by the dashed arrow 101, the SRS transmitted signal is transmitted through the path of terminal T1 → power amplifier PA1 → bandpass filter F1 → TRX switch 11 → switch 12 → switch S35 → bandpass filter F31 → antenna ANT3.

[0095] The transmission (SRS) by antenna ANT4 (T-4) will be explained. Return to... Figure 4 The twelfth row 412 in Table 400 indicates the part of the high-frequency signal transceiver circuit 1a through which the high-frequency transmission signal TXin, which is the SRS signal, passes when the transmission is performed by antenna ANT4.

[0096] When the high-frequency transmission signal TXin, which serves as the SRS signal, is input to terminal T1 on the left side of module M1, power amplifier PA1 amplifies and outputs the high-frequency transmission signal TXin. The amplified SRS signal is then input to bandpass filter F1. Bandpass filter F1 allows the SRS signal to pass through its passband. The SRS signal after passing through bandpass filter F1 is then input to TRX switch 11.

[0097] In the case of transmission (SRS) by antenna ANT4, TRX switch 11 is set based on control signal Sig1, and switch 12 is set based on control signal Sig2, so that the SRS signal is input to module M3.

[0098] In module M3, control signal Sig42 turns switch S45 on and switches S43 and S44 off. As a result, the SRS signal is input to bandpass filter F41. That is, the SRS signal is input to bandpass filter F41, which is located close to antenna ANT4 of module M4. This input location differs from the comparative example. Bandpass filter F41 allows the SRS signal to pass through its passband. The SRS signal after passing through bandpass filter F41 is output to antenna ANT4.

[0099] Regarding the case of reception (R-1-1) by antenna ANT1 (normal), it corresponds to the first row 401 in Table 400. The first row 401 in Table 400 indicates the location within the high-frequency signal transceiver circuit 1a through which the high-frequency received signal passes in the case of reception (normal) by antenna ANT1. The operation in this case is similar to... Figure 2 The situation is the same for the first row 201 in Table 200.

[0100] Regarding the case of reception (R-1-2) by antenna ANT1 (high input), it corresponds to the second row 402 in Table 400. The second row 402 in Table 400 indicates the part of the high-frequency signal transceiver circuit 1a through which the high-frequency received signal passes when reception is performed by antenna ANT1 (high input). The operation in this case is similar to... Figure 2 The situation is the same for the second row 202 in Table 200.

[0101] Regarding the case of reception (normal) via antenna ANT2 (R-2-1), this corresponds to row 404 in Table 400. Row 404 in Table 400 indicates the location within the high-frequency signal transceiver circuit 1a through which the high-frequency received signal passes in the case of reception (normal) via antenna ANT2. The operation in this case is similar to... Figure 2 The situation is the same for the fourth row 204 in Table 200.

[0102] Regarding the case of reception (high input) via antenna ANT2 (R-2-2), it corresponds to row 5, line 405 in Table 400. Row 5, line 405 in Table 400 indicates the part of the high-frequency signal transceiver circuit 1a through which the high-frequency received signal passes when reception is performed via antenna ANT2 (high input). The operation in this case is similar to... Figure 2 The case is the same for the fifth row, 205, in Table 200.

[0103] Regarding the case of reception (normal) via antenna ANT3 (R-3-1), this corresponds to line 7, 407 in Table 400. Line 7, 407 in Table 400 indicates the location within the high-frequency signal transceiver circuit 1a through which the high-frequency received signal passes in the case of reception (normal) via antenna ANT3. The operation in this case is similar to... Figure 2 The situation is the same for the seventh row, 207, in Table 200.

[0104] Regarding the case of reception (high input) via antenna ANT3 (R-3-2), this corresponds to row 8, line 408 in Table 400. Row 8, line 408 in Table 400 indicates the location within the high-frequency transceiver circuit 1a through which the high-frequency received signal passes when reception is performed via antenna ANT3 (high input). The operation in this case is similar to... Figure 2 The situation is the same for row 208 in table 200.

[0105] Regarding the case of reception (normal) via antenna ANT4 (R-4-1), this corresponds to row 10, 410 in Table 400. Row 10, 410 in Table 400 indicates the location within the high-frequency signal transceiver circuit 1a through which the high-frequency received signal passes in the case of reception (normal) via antenna ANT4. The operation in this case is similar to... Figure 2 The situation is the same for row 210 in table 200.

[0106] Regarding the case of reception (high input) via antenna ANT4 (R-4-2), it corresponds to row 11, 411 in Table 400. Row 11, 411 in Table 400 indicates the location within the high-frequency transceiver circuit 1a through which the high-frequency received signal passes when reception is performed via antenna ANT4 (high input). The operation in this case is similar to... Figure 2 The situation is the same as in the eleventh row, 211, of Table 200.

[0107] According to the high-frequency signal transceiver circuit 1a of the first embodiment, by employing a switching switch for inputting SRS signals between the receiving antenna and the amplification section, the increase in circuit size can be suppressed. Furthermore, by inputting SRS signals at a location that does not bypass the low-noise amplifier, it is not necessary to construct the path bypassing the low-noise amplifier to support high power.

[0108] Furthermore, at least two of the following are preferably located on the same substrate: TRX switch 11, switching switch 12, switch S35 or S45, and low-noise amplifiers LA3 and LA4 that amplify the received signal. By being located on the same substrate, they can be processed as modules.

[0109] <Second Implementation Method>

[0110] Figure 6This is a diagram showing the structure of the high-frequency signal transceiver circuit 1b according to the second embodiment. Figure 6 In the high-frequency signal transceiver circuit 1b shown, module M1a is used to replace the reference. Figure 3 The high-frequency signal transceiver circuit 1a described herein includes module M1. Within module M1a, the position of the bandpass filter is relative to the reference... Figure 3 The module M1 of the high-frequency signal transceiver circuit 1a described is different.

[0111] That is, in the high-frequency signal transceiver circuit 1b, a bandpass filter F1 is provided between the TRX switch 11 and the antenna ANT1, and a bandpass filter F2 is provided between the TRX switch 11 and the antenna ANT2. In the high-frequency signal transceiver circuit 1a, a bandpass filter F1 is provided between the TRX switch 11 and the antenna ANT1. In contrast, in the high-frequency signal transceiver circuit 1b, no bandpass filter is provided between the power amplifier PA1 and the TRX switch 11.

[0112] Furthermore, in the high-frequency signal transceiver circuit 1a, bandpass filters F11 and F21 are provided between the TRX switch 11 and the switch group S2. In contrast, in the high-frequency signal transceiver circuit 1b, no bandpass filter is provided between the TRX switch 11 and the switch group S2.

[0113] exist Figure 6 In the path indicated by the dashed arrow 101, the bandpass filter to be passed is the bandpass filter F31 within module M2. Therefore, when the SRS signal is transmitted by antenna ANT3, the number of bandpass filters to be passed is reduced compared to the case of high-frequency signal transceiver circuit 1a. This reduces the degradation of the SRS signal.

[0114] Furthermore, in the case of transmission (normal) via antenna ANT1, the transmitted signal after passing through TRX switch 11 passes through bandpass filter F1, therefore the transmitted signal output from antenna ANT1 is the same as... Figure 3 The situation is the same. Furthermore, in the case of transmission (normal) via antenna ANT2, the transmitted signal after passing through TRX switch 11 passes through bandpass filter F2, therefore the transmitted signal output from antenna ANT2 is the same as... Figure 3 The situation is the same.

[0115] According to the high-frequency signal transceiver circuit 1b of the second embodiment, by employing a switching switch for inputting SRS signals between the receiving antenna and the amplification section, the increase in circuit size can be suppressed. Furthermore, by inputting SRS signals at a location that does not bypass the low-noise amplifier, it is not necessary to configure the path bypassing the low-noise amplifier to support high power.

[0116] Furthermore, in the high-frequency signal transceiver circuit 1b of the second embodiment, compared with the first embodiment, the number of bandpass filters can be reduced, and the increase in circuit size can be suppressed. In addition, reducing the number of bandpass filters to be passed can reduce the degradation of the SRS signal.

[0117] <Third Implementation Method>

[0118] Figure 7 This is a diagram showing the structure of the high-frequency signal transceiver circuit 1c according to the third embodiment. Figure 7 The high-frequency signal transceiver circuit 1c shown is based on the reference Figure 3 The high-frequency signal transceiver circuit 1a described herein adds antennas ANT5 and ANT6, modules M4 and M5, and uses module M1b instead of module M1. The high-frequency signal transceiver circuit 1c supports 2T6R for transmitting radio waves from antennas ANT1 and ANT2 and receiving radio waves using antennas ANT1, ANT2, ANT3, ANT4, ANT5, and ANT6 under normal communication conditions. With the increase in the number of antennas and modules, in module M1b, switch 12a and control IC 120a are used instead of switch 12 and control IC 120 in module M1. Switch 12a is equivalent to the selection switch of this disclosure.

[0119] Module M4 includes terminals R5 and P5, switch group S5a, low-noise amplifier LA5, attenuator A5, switch group S5c, bandpass filter F51, and control IC 50. Switch group S5a includes switches S51 and S52. Switch group S5c includes switches S53, S54, and S55.

[0120] One end of switch S51 and one end of switch S52 are connected to terminal R5. The other end of switch S51 is electrically connected to the output terminal of low-noise amplifier LA5. The input terminal of low-noise amplifier LA5 is electrically connected to one end of switch S53. The other end of switch S52 is electrically connected to one end of attenuator A5. The other end of attenuator A5 is electrically connected to one end of switch S54. The other ends of switches S53 and S54 are electrically connected to one end of bandpass filter F51. The other end of bandpass filter F51 is electrically connected to antenna ANT5.

[0121] Each switch in switch group S5a is in an ON or OFF state based on the control signal Sig51 input from control IC 50. Each switch in switch group S5c is in an ON or OFF state based on the control signal Sig52 input from control IC 50.

[0122] Module M5 includes terminals R6 and P6, switch group S6a, low-noise amplifier LA6, attenuator A6, switch group S6c, bandpass filter F61, and control IC 60. Switch group S6a includes switches S61 and S62. Switch group S6c includes switches S63, S64, and S65.

[0123] One end of switch S61 and one end of switch S62 are connected to terminal R6. The other end of switch S61 is electrically connected to the output terminal of low-noise amplifier LA6. The input terminal of low-noise amplifier LA6 is electrically connected to one end of switch S63. The other end of switch S62 is electrically connected to one end of attenuator A6. The other end of attenuator A6 is electrically connected to one end of switch S64. The other ends of switches S63 and S64 are electrically connected to one end of bandpass filter F61. The other end of bandpass filter F61 is electrically connected to antenna ANT6.

[0124] Each switch in switch group S6a is in an ON or OFF state based on the control signal Sig61 input from control IC 60. Each switch in switch group S6c is in an ON or OFF state based on the control signal Sig62 input from control IC 60.

[0125] Figure 8 This is a diagram illustrating the operation of the high-frequency signal transceiver circuit 1c according to the third embodiment. Figure 8 This is a diagram showing the parts within modules M1b, M2, M3, M4, and M5 through which the high-frequency signal passes in the case of (T) transmission and (R) reception.

[0126] The transmission scenarios (T) include: (T-1) Transmission by antenna ANT1 (normal), (T-2) Transmission by antenna ANT2 (normal), (T-3) Transmission by antenna ANT3 (SRS), (T-4) Transmission by antenna ANT4 (SRS), (T-5) Transmission by antenna ANT5 (SRS), and (T-6) Transmission by antenna ANT6 (SRS).

[0127] (R) The reception scenarios include: (R-1-1) reception by antenna ANT1 (normal), (R-1-2) reception by antenna ANT1 (high input), (R-2-1) reception by antenna ANT2 (normal), (R-2-2) reception by antenna ANT2 (high input), (R-3-1) reception by antenna ANT3 (normal), (R-3-2) reception by antenna ANT3 (high input), (R-4-1) reception by antenna ANT4 (normal), (R-4-2) reception by antenna ANT4 (high input), (R-5-1) reception by antenna ANT5 (normal), (R-5-2) reception by antenna ANT5 (high input), (R-6-1) reception by antenna ANT6 (normal), and (R-6-2) reception by antenna ANT6 (high input).

[0128] In the case of transmission (T-1) by antenna ANT1 (normal), the third row 603 in Table 600 indicates the location within the high-frequency signal transceiver circuit 1c through which the high-frequency received signal passes in the case of transmission (normal) by antenna ANT1. In this case, the operation of module M1 is the same as that of the high-frequency signal transceiver circuit 1a in the first embodiment.

[0129] In the case of transmission (T-2) by antenna ANT2 (normal), the sixth row 606 in Table 600 indicates the location within the high-frequency signal transceiver circuit 1c through which the high-frequency received signal passes in the case of transmission (normal) by antenna ANT2. In this case, the operation of module M1 is the same as that of the high-frequency signal transceiver circuit 1a in the first embodiment.

[0130] The case of transmission (SRS) performed by antenna ANT3 (T-3) will be explained. Row 9, 609 in Table 600 indicates the location within the high-frequency transceiver circuit 1c through which the high-frequency transmission signal TXin, as the SRS signal, passes when transmission (SRS) is performed by antenna ANT3. In this case, the operation of modules M1 and M2 is the same as that of the high-frequency transceiver circuit 1a in the first embodiment.

[0131] The case of transmission (SRS) performed by antenna ANT4 (T-4) will be explained. Row 12, 612 of Table 600 indicates the location within the high-frequency signal transceiver circuit 1c through which the high-frequency transmission signal TXin, as the SRS signal, passes in the case of transmission (SRS) performed by antenna ANT4. In this case, the operation of modules M1 and M3 is the same as that of the high-frequency signal transceiver circuit 1a in the first embodiment.

[0132] The case of transmission (SRS) by antenna ANT5 (T-5) will be explained. Row 15, 615 of Table 600 indicates the location within the high-frequency transceiver circuit 1c through which the high-frequency transmission signal TXin, as the SRS signal, passes when transmission (SRS) is performed by antenna ANT5. In this case, the operation of modules M1 and M4 is as follows: When the high-frequency transmission signal TXin, as the SRS signal, is input to terminal T1 on the left side of module M1, power amplifier PA1 amplifies the high-frequency transmission signal TXin and outputs it. The amplified SRS signal is input to bandpass filter F1. Bandpass filter F1 allows the SRS signal to pass through its passband. The SRS signal after passing through bandpass filter F1 is input to TRX switch 11.

[0133] In the case of transmission (SRS) by antenna ANT5, TRX switch 11 is set based on control signal Sig1, and switch 12a is set based on control signal Sig2a, so that the SRS signal is input to module M4. Switch 12a is equivalent to the selection switch of this disclosure.

[0134] In module M4, control signal Sig52 turns switch S55 on and switches S53 and S54 off. As a result, the SRS signal is input to bandpass filter F51. That is, the SRS signal is input to bandpass filter F51, which is located close to antenna ANT5 of module M4. Bandpass filter F51 allows the SRS signal to pass through its passband. The SRS signal after passing through bandpass filter F51 is then output to antenna ANT5.

[0135] The case of transmission (SRS) by antenna ANT6 (T-6) will be explained. Row 18, 618 of Table 600 indicates the location within the high-frequency transceiver circuit 1c through which the high-frequency transmission signal TXin, as the SRS signal, passes when transmission (SRS) is performed by antenna ANT6. In this case, the operation of modules M1 and M5 is as follows: When the high-frequency transmission signal TXin, as the SRS signal, is input to terminal T1 on the left side of module M1, power amplifier PA1 amplifies the high-frequency transmission signal TXin and outputs it. The amplified SRS signal is input to bandpass filter F1. Bandpass filter F1 allows the SRS signal to pass through its passband. The SRS signal after passing through bandpass filter F1 is input to TRX switch 11.

[0136] In the case of transmission (SRS) by antenna ANT6, TRX switch 11 is set based on control signal Sig1, and switch 12a is set based on control signal Sig2a, so that the SRS signal is input to module M5. Switch 12a is equivalent to the selection switch of this disclosure.

[0137] In module M5, control signal Sig62 turns switch S65 on and switches S63 and S64 off. As a result, the SRS signal is input to bandpass filter F61. That is, the SRS signal is input to bandpass filter F61, which is located close to antenna ANT5 of module M5. Bandpass filter F61 allows the SRS signal to pass through its passband. The SRS signal after passing through bandpass filter F61 is then output to antenna ANT6.

[0138] Regarding the case of reception (R-1-1) by antenna ANT1 (normal), it corresponds to the first row 601 in Table 600. The first row 601 in Table 600 indicates the part of the high-frequency signal transceiver circuit 1c through which the high-frequency received signal passes in the case of reception (normal) by antenna ANT1. In this case, the operation of module M1b is the same as that of module M1 in high-frequency signal transceiver circuit 1a.

[0139] Regarding the case of reception (R-1-2) by antenna ANT1 (high input), it corresponds to the second row 602 in Table 600. The second row 602 in Table 600 indicates the part of the high-frequency signal transceiver circuit 1c through which the high-frequency received signal passes when reception is performed by antenna ANT1 (high input). In this case, the operation of module M1b is the same as that of module M1 in high-frequency signal transceiver circuit 1a.

[0140] Regarding the case of reception (normal) by antenna ANT2 (R-2-1), it corresponds to the fourth row 604 in Table 600. The fourth row 604 in Table 600 indicates the part of the high-frequency signal transceiver circuit 1c through which the high-frequency received signal passes in the case of reception (normal) by antenna ANT2. In this case, the operation of module M1b is the same as that of module M1 in high-frequency signal transceiver circuit 1a.

[0141] Regarding the case of reception (R-2-2) by antenna ANT2 (high input), it corresponds to the fifth row 605 in Table 600. The fifth row 605 in Table 600 indicates the part of the high-frequency signal transceiver circuit 1c through which the high-frequency received signal passes when reception is performed by antenna ANT2 (high input). In this case, the operation of module M1b is the same as that of module M1 in high-frequency signal transceiver circuit 1a.

[0142] Regarding the case of reception (normal) by antenna ANT3 (R-3-1), it corresponds to the seventh row, 607 in Table 600. The seventh row, 607 in Table 600 indicates the location within the high-frequency signal transceiver circuit 1c through which the high-frequency received signal passes in the case of reception (normal) by antenna ANT3. In this case, the operation of modules M1b and M2 is the same as that of modules M1 and M2 in the high-frequency signal transceiver circuit 1a.

[0143] Regarding the case of reception (R-3-2) by antenna ANT3 (high input), it corresponds to row 8, line 608 in Table 600. Row 8, line 608 in Table 600 indicates the location within the high-frequency signal transceiver circuit 1c through which the high-frequency received signal passes when reception is performed by antenna ANT3 (high input). In this case, the operation of modules M1b and M2 is the same as that of modules M1 and M2 in high-frequency signal transceiver circuit 1a.

[0144] Regarding the case of reception (normal) by antenna ANT4 (R-4-1), it corresponds to row 10, line 610 in Table 600. Row 10, line 610 in Table 600 indicates the location within the high-frequency signal transceiver circuit 1c through which the high-frequency received signal passes in the case of reception (normal) by antenna ANT4. In this case, the operation of modules M1b and M3 is the same as that of modules M1 and M3 in high-frequency signal transceiver circuit 1a.

[0145] Regarding the case of reception (R-4-2) by antenna ANT4 (high input), it corresponds to row 11, line 611 in Table 600. Row 11, line 611 in Table 600 indicates the location within the high-frequency signal transceiver circuit 1c through which the high-frequency received signal passes when reception is performed by antenna ANT4 (high input). In this case, the operation of modules M1b and M3 is the same as that of modules M1 and M3 in high-frequency signal transceiver circuit 1a.

[0146] The reception (normal) case by antenna ANT5 (R-5-1) is explained. Line 13, 613 of Table 600 indicates the location within the high-frequency signal transceiver circuit 1c through which the high-frequency received signal passes in the normal case of reception by antenna ANT5.

[0147] In the normal receiving mode using antenna ANT5, switch S51 is set to the ON state based on control signal Sig51 input from control IC 50. Additionally, switch S53 is set to the ON state based on control signal Sig52 input from control IC 50. Switch S52 is set to the OFF state based on control signal Sig51 input from control IC 50. Switch S54 is set to the OFF state based on control signal Sig52 input from control IC 50.

[0148] The high-frequency received signal from antenna ANT5 is input to bandpass filter F51. Bandpass filter F51 allows the high-frequency received signal to pass through its passband. The high-frequency received signal after passing through bandpass filter F51 is input to low-noise amplifier LA5 via switch 53.

[0149] The low-noise amplifier LA5 amplifies the high-frequency received signal after passing through switch S53. The high-frequency received signal amplified by the low-noise amplifier LA5 is then output from terminal R5 as the high-frequency received signal RXout5 via switch S51.

[0150] The reception (high input) by antenna ANT5 (R-5-2) is explained. Row 14, 614 of Table 600 indicates the location within the high-frequency transceiver circuit 1c through which the high-frequency received signal passes when receiving by antenna ANT5 (high input).

[0151] When receiving data via antenna ANT5 (high input), switch S52 is set to the ON state based on control signal Sig51 input from control IC 50. Additionally, switch S54 is set to the ON state based on control signal Sig52 input from control IC 50. Switch S51 is set to the OFF state based on control signal Sig51 input from control IC 50. Switch S53 is set to the OFF state based on control signal Sig52 input from control IC 50.

[0152] The high-frequency received signal from antenna ANT5 is input to bandpass filter F51. Bandpass filter F51 allows the high-frequency received signal to pass through its passband. The high-frequency received signal after passing through bandpass filter F51 is input to attenuator A5 via switch 54.

[0153] Attenuator A5 attenuates the high-frequency received signal after passing through switch S54 to an appropriate level. The high-frequency received signal attenuated by attenuator A5 is then output from terminal R5 as the high-frequency received signal RXout5 via switch S52.

[0154] The reception (normal) case by antenna ANT6 (R-6-1) is explained. Row 616 in Table 600 indicates the part of the high-frequency signal transceiver circuit 1c through which the high-frequency received signal passes in the case of reception (normal) by antenna ANT6.

[0155] In the normal receiving mode using antenna ANT6, switch S61 is set to the ON state based on control signal Sig61 input from control IC 60. Additionally, switch S63 is set to the ON state based on control signal Sig62 input from control IC 60. Switch S62 is set to the OFF state based on control signal Sig61 input from control IC 60. Switch S64 is set to the OFF state based on control signal Sig62 input from control IC 60.

[0156] The high-frequency received signal from antenna ANT6 is input to bandpass filter F61. Bandpass filter F61 allows the high-frequency received signal to pass through its passband. The high-frequency received signal after passing through bandpass filter F61 is input to low-noise amplifier LA6 via switch 63.

[0157] The low-noise amplifier LA6 amplifies the high-frequency received signal after passing through switch S53. The high-frequency received signal amplified by the low-noise amplifier LA6 is then output from terminal R6 as the high-frequency received signal RXout6 via switch S61.

[0158] The reception (high input) by antenna ANT6 (R-6-2) is explained. Row 17, 617 of Table 600 indicates the location within the high-frequency transceiver circuit 1c through which the high-frequency received signal passes when receiving by antenna ANT6 (high input).

[0159] When receiving data via antenna ANT6 (high input), switch S62 is set to the ON state based on control signal Sig61 input from control IC 60. Additionally, switch S64 is set to the ON state based on control signal Sig62 input from control IC 60. Switch S61 is set to the OFF state based on control signal Sig61 input from control IC 60. Switch S63 is set to the OFF state based on control signal Sig62 input from control IC 60.

[0160] The high-frequency received signal from antenna ANT6 is input to bandpass filter F61. Bandpass filter F61 allows the high-frequency received signal to pass through its passband. The high-frequency received signal after passing through bandpass filter F61 is input to attenuator A6 via switch 64.

[0161] Attenuator A6 attenuates the high-frequency received signal after passing through switch S64 to an appropriate level. The high-frequency received signal attenuated by attenuator A6 is then output from terminal R6 as the high-frequency received signal RXout6 via switch S62.

[0162] According to the high-frequency signal transceiver circuit 1c of the third embodiment, by employing a switching switch and a selection switch for inputting SRS signals between the receiving antenna and the amplification section, the increase in circuit size can be suppressed. Furthermore, by inputting SRS signals at a location that does not bypass the low-noise amplifier, it is not necessary to configure the path bypassing the low-noise amplifier to support high power.

[0163] According to the high-frequency signal transceiver circuit 1c of the third embodiment, the number of antennas can be increased compared to the high-frequency signal transceiver circuit 1a of the first embodiment and the high-frequency signal transceiver circuit 1b of the second embodiment. Especially in the case of a dual-screen mobile communication device, there is a tendency for the volume of the housing to increase, so the number of antennas provided in the housing can be increased. In addition, if the volume of the housing increases, antennas can be provided in separate positions within the housing.

[0164] <Fourth Implementation Method>

[0165] Figure 9 This is a diagram showing the structure of the high-frequency signal transceiver circuit 1d according to the fourth embodiment. (Compared with reference to...) Figure 6 Similarly, the high-frequency signal transceiver circuit 1b described herein... Figure 9 The location of the bandpass filter in the high-frequency signal transceiver circuit 1d is different from that in the high-frequency signal transceiver circuit 1c. That is, in the high-frequency signal transceiver circuit 1d, module M1c is used instead of module M1b. In module M1c, a bandpass filter F1 is provided between TRX switch 11 and antenna ANT1, and a bandpass filter F2 is provided between TRX switch 11 and antenna ANT2.

[0166] In the high-frequency signal transceiver circuit 1c, a bandpass filter F1 is provided between the TRX switch 11 and the antenna ANT1. In contrast, in the high-frequency signal transceiver circuit 1d, no bandpass filter is provided between the power amplifier PA1 and the TRX switch 11. Furthermore, in the high-frequency signal transceiver circuit 1c, bandpass filters F11 and F21 are provided between the TRX switch 11 and the switch group S2. In contrast, in the high-frequency signal transceiver circuit 1d, no bandpass filter is provided between the TRX switch 11 and the switch group S2. Therefore, when SRS signals are transmitted by antennas ANT3 and ANT4, the number of bandpass filters required is reduced compared to the case of the high-frequency signal transceiver circuit 1c. This reduces SRS signal degradation.

[0167] Furthermore, in the case of transmission (normal) via antenna ANT1, the transmitted signal after passing through TRX switch 11 passes through bandpass filter F1, therefore the transmitted signal output from antenna ANT1 is the same as... Figure 7 The situation is the same. Furthermore, in the case of transmission (normal) via antenna ANT2, the transmitted signal after passing through TRX switch 11 passes through bandpass filter F2, therefore the transmitted signal output from antenna ANT2 is the same as... Figure 7 The situation is the same.

[0168] According to the high-frequency signal transceiver circuit 1d of the fourth embodiment, by employing a switching switch and a selection switch for inputting SRS signals between the receiving antenna and the amplification section, the increase in circuit size can be suppressed. Furthermore, by inputting SRS signals at a location that does not bypass the low-noise amplifier, it is not necessary to construct the path bypassing the low-noise amplifier to support high power.

[0169] Furthermore, in the high-frequency signal transceiver circuit 1d of the fourth embodiment, compared with the first embodiment, the number of bandpass filters can be reduced, and the increase in circuit size can be suppressed. In addition, reducing the number of bandpass filters to be passed can reduce the degradation of the SRS signal.

[0170] According to the high-frequency signal transceiver circuit 1d of the fourth embodiment, the number of antennas can be increased compared to the high-frequency signal transceiver circuit 1a of the first embodiment and the high-frequency signal transceiver circuit 1b of the second embodiment. In particular, in the case of a dual-screen mobile communication device, there is a tendency for the volume of the housing to increase, so the number of antennas provided in the housing can be increased. In addition, if the volume of the housing increases, antennas can be provided in separate positions within the housing.

[0171] Explanation of reference numerals in the attached figures

[0172] 1, 1a, 1b, 1c, 1d: High-frequency signal transceiver circuits

[0173] 10, 30, 30a, 40, 40a, 50, 60, 110, 120, 120a: Control IC

[0174] 11: TRX switch

[0175] 12, 12a, 13, 14, 53, 54, 63, 64, S11, S12, S13, S14, S21, S22, S23, S24, S31, S32, S33, S34, S35, S41, S42, S43, S44, S45, S51, S52, S53, S54, S55, S61, S62, S63, S64, S65: Switches

[0176] A1, A2, A3, A4, A5, A6: Attenuators

[0177] ANT1, ANT2, ANT3, ANT4, ANT5, ANT6: Antennas

[0178] F1, F2, F11, F21, F31, F41, F51, F61: Bandpass filters

[0179] LA1, LA2, LA3, LA4, LA5, LA6: Low-noise amplifiers

[0180] M1, M1a, M1b, M1c, M2, M3, M4, M5, M11, M12: Modules

[0181] PA1: Power Amplifier

[0182] P1, P2, P3, P4, P5, P6, R1, R2, R3, R4, R5, R6, T1: Terminals

[0183] S1, S2, S3a, S3b, S3c, S4a, S4b, S4c, S5a, S5c, S6a, S6c: Switch group

Claims

1. A high-frequency signal transceiver circuit for transmitting a detection reference signal, i.e., an SRS signal, comprising: Transceiver antenna terminals; A TRX switch that switches the path from the amplifier that amplifies the transmitted signal to the transceiver antenna terminal and the path from the amplifier to the switching switch. Receiving antenna; and Receiver circuit in, The receiving circuit includes a receiving antenna terminal, an amplification section for amplifying the received signal, and a bypass switch. The switching switch is connected between the TRX switch and the receiving circuit. The SRS signal input via the bypass switch is transmitted through the receiving antenna terminal via the switching switch.

2. The high-frequency signal transceiver circuit according to claim 1, wherein, The high-frequency signal transceiver circuit includes multiple receiving circuits. The switching switch is used to select the connection with the plurality of receiving circuits. The SRS signal is input between one of the plurality of receiving antenna terminals and the amplification section corresponding to that receiving antenna terminal.

3. The high-frequency signal transceiver circuit according to claim 1 or 2, wherein, In the receiving circuit, a filter is disposed between the amplification section and the receiving antenna terminal.

4. The high-frequency signal transceiver circuit according to any one of claims 1 to 3, wherein, The SRS signal is amplified in an amplifier that amplifies the transmitted signal, and transmitted via the receiving antenna terminal via the TRX switch, the switching switch, and the bypass switch, without passing through the amplification section that amplifies the received signal.

5. The high-frequency signal transceiver circuit according to any one of claims 1 to 4, wherein, At least two of the TRX switch, the switching switch, the bypass switch, and the amplification section that amplifies the received signal are located on the same substrate.

6. The high-frequency signal transceiver circuit according to any one of claims 1 to 5, wherein, The high-frequency signal transceiver circuit includes a filter disposed between the TRX switch and the transceiver antenna terminal. The filter has a passband that includes the transmitted signal.

7. The high-frequency signal transceiver circuit according to any one of claims 1 to 6, wherein, The receiving circuit includes an amplification section for amplifying the received signal, a bypass switch, a filter, an input-side switch disposed on the input side of the amplification section for amplifying the received signal, and an output-side switch disposed on the output side of the amplification section. One end of the bypass switch is input with the SRS signal. One end of the filter is connected to the receiving antenna terminal. The other end of the bypass switch, the other end of the filter, and the other end of the input-side switch are connected.

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