JP5792003B2 - booster - Google Patents

Description

  The present invention relates to a booster that amplifies a high-frequency signal.

  In the booster proposed in Patent Document 1, a bidirectional booster that amplifies a high-frequency signal in a downstream frequency band and amplifies a high-frequency signal in an upstream frequency band can be obtained by operating the bidirectional booster in a single operation. It is possible to switch to a booster for a different downstream frequency band. That is, the booster proposed in Patent Document 1 has a function of switching the downstream frequency band.

JP 2011-29909 A Japanese Patent Laying-Open No. 2011-30253 (FIGS. 2 and 3)

  When a high frequency signal from a broadcast optical subscriber terminal (V-ONU: Video-Optical Network Unit) is input as a downstream signal to a conventional booster, the signal level of the high frequency signal from the V-ONU is high. There arises a problem that the signal level of the downstream signal output from the booster becomes too high.

  When the booster proposed in Patent Document 1 described above is used, the above-described problem occurs as in other conventional boosters. That is, the above problem cannot be solved by the function of switching the band of the downlink frequency band possessed by the booster proposed in Patent Document 1.

  In order to solve the above problems, it is necessary to implement measures for newly installing an attenuator between the V-ONU and the booster, or removing the booster itself and directly connecting the V-ONU to a television receiver or the like. is there. For this reason, for example, when a system change from a CATV system to an optical operation system or a system change from an optical operation system to a CATV system is required, it is necessary to attach an attenuator or remove a booster, which takes time.

  In addition, the booster changes from the system that does not input the high-frequency signal from the V-ONU to the system that the booster inputs the high-frequency signal from the V-ONU, or the booster changes from the system that inputs the high-frequency signal from the V-ONU. In the case of a system change where the signal level of the booster input signal changes as well as a change to a system that does not input a high-frequency signal from the V-ONU, as long as a conventional booster is used, It is necessary to remove the booster.

  An object of this invention is to provide the booster which can respond | correspond to several input signals from which a level differs in view of said situation.

  In order to achieve the above object, a booster according to one aspect of the present invention selects one mode from an input terminal for inputting a high-frequency signal and a plurality of modes corresponding to the type of the high-frequency signal input to the input terminal. And an attenuation unit that changes an attenuation amount according to a selection state of the switch. The change of the attenuation amount of the attenuation unit includes the case where the attenuation amount of the attenuation unit is set to zero.

  According to such a configuration, when the level of a high-frequency signal that is an input signal is changed due to a change in the system, it can be easily handled only by operating the switch.

  An upstream signal amplifying unit for amplifying the upstream signal, wherein the input terminal outputs the upstream signal amplified by the upstream signal amplifier, and power supply to the upstream signal amplifier is turned on; / OFF may be switched according to the selection state of the switch. As a result, unnecessary power consumption of the upstream signal amplifying unit can be eliminated.

  Further, the switch includes a UHF mode corresponding to a case where the frequency band of the high-frequency signal is a UHF band, a CATV mode corresponding to a case where the frequency band of the high-frequency signal is a CATV band, and the high-frequency signal from an optical signal. A switch that selects one mode from three modes of an optical operation mode corresponding to a signal converted into an electric signal, and when the optical operation mode is selected by the switch, the switch operates the CATV. The attenuation amount of the attenuation unit may be larger than when the mode is selected.

  In order to achieve the above object, a booster according to another aspect of the present invention includes a first input terminal for inputting a high-frequency signal and a first input terminal for inputting an intermediate frequency signal or a mixed signal of the intermediate frequency signal and the high-frequency signal. A first mode corresponding to a case where the high frequency signal is input to the first input terminal and the intermediate frequency signal is input to the second input terminal; and the second input terminal A first switch for selecting one of the second modes corresponding to the case where the mixed signal is input to the first input terminal, and the type of the high-frequency signal input to the first input terminal or the second input terminal A second switch for selecting one mode from a plurality of modes corresponding to the first mode, a first attenuation unit for changing an attenuation amount for attenuating the high-frequency signal in accordance with a selection state of the second switch, Intermediate frequency A configuration and a second damping portion is changed according to the attenuation amount for attenuating the No. in the selection state of the first switch of the selected state and the second switch.

  According to such a configuration, not only the level of the high-frequency signal that is the input signal, but also the level of the intermediate-frequency signal is changed depending on the input form of the high-frequency signal and the intermediate-frequency signal and the level of the high-frequency signal. In such a case, it can be easily handled only by operating the first switch and the second switch.

  An upstream signal amplifying unit for amplifying the upstream signal, wherein the first input terminal or the second input terminal outputs the upstream signal amplified by the upstream signal amplifier; On / off of power supply to the signal amplifier may be switched according to the selection state of the second switch. As a result, unnecessary power consumption of the upstream signal amplifying unit can be eliminated.

  According to the booster according to the present invention, it is possible to easily cope with a plurality of input signals having different levels only by operating a switch.

It is a block diagram which shows the principal part structure of the booster which concerns on 1st Embodiment of this invention. It is a circuit diagram which shows an example of the booster which concerns on 1st Embodiment of this invention. It is a block diagram which shows the principal part structure of the booster which concerns on 2nd Embodiment of this invention. It is a circuit diagram which shows an example of the booster which concerns on 2nd Embodiment of this invention. FIG. 5 is a diagram showing input / output characteristics of a logic circuit (NAND circuit) included in the booster shown in FIG. 4. It is a block diagram which shows the modification of the booster which concerns on 1st Embodiment of this invention. It is a block diagram which shows the other modification of the booster which concerns on 1st Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is a block diagram showing a main configuration of a booster according to the first embodiment of the present invention. The booster according to the first embodiment of the present invention includes an input terminal 101 for inputting a high frequency signal, an optical operation mode (for example, 70 to 770 MHz), and a CATV mode (for example, a downstream signal of 70 to 770 MHz, an upstream signal of 10 to 60 MHz). , Optical operation / CATV / UHF changeover switch 102 for switching between UHF modes (for example, 470 to 710 MHz or 470 to 770 MHz), an input ATT switch 103, an attenuation unit 104 for attenuating high frequency signals, and a frequency for switching 710 MHz / 770 MHz The selector switch 105, the input ATT switch 106, an amplifier 107 that amplifies the high-frequency signal, and an output terminal 108 that outputs the high-frequency signal amplified by the amplifier 107 are provided. The input ATT is set to attenuation (for example, −10 dB) when the input level is high.

  The attenuating unit 104 changes the attenuation amount according to the selection state of the optical operation / CATV / UHF changeover switch 102. Specifically, when the optical operation mode is selected by the optical operation / CATV / UHF changeover switch 102, the attenuation unit 104 is when the CATV mode is selected by the optical operation / CATV / UHF changeover switch 102. The amount of attenuation is increased compared to. Note that the attenuation amount of the attenuation unit 104 when the CATV mode is selected by the optical operation / CATV / UHF changeover switch 102 may be zero.

  When the input terminal 101 inputs a high frequency signal from the V-ONU, the user or the contractor can select the optical operation / CATV / UHF switch 102 so that the optical operation / CATV / UHF switch 102 selects the optical operation mode. To operate. When the input terminal 101 inputs a high-frequency signal from the CATV station, the user or the contractor can select the optical operation / CATV / UHF switch 102 so that the optical operation / CATV / UHF switch 102 selects the CATV mode. To operate. When the input terminal 101 inputs a high-frequency signal from the UHF antenna, the user or a contractor can use the optical operation / CATV / UHF changeover switch 102 so that the optical operation / CATV / UHF changeover switch 102 selects the UHF mode. To operate.

  The high-frequency signal from the V-ONU has a higher signal level than the high-frequency signal from the CATV station, but when the optical operation mode is selected by the optical operation / CATV / UHF switch 102, the optical operation / CATV / UHF is selected. Since the attenuation amount of the attenuation unit 104 is larger than when the CATV mode is selected by the changeover switch 102, the operation from the CATV system to the optical operation system can be performed only by operating the optical operation / CATV / UHF changeover switch 102. A system change or a system change from an optical operation system to a CATV system can be easily realized.

  Next, an example of the booster according to the first embodiment of the present invention will be described. FIG. 2 is a circuit diagram showing an example of a booster according to the first embodiment of the present invention.

  The booster having the circuit configuration shown in FIG. 2 includes a first terminal T1, an LPF (Low Pass Filter) 1 having a cutoff frequency of 770 MHz, and a downstream signal HPF having a cutoff frequency of 70 MHz and passing a downstream signal. (High Pass Filter) 2, an input ATT switch 3 for switching the setting of the built-in input ATT to, for example, any one of −10 dB / −5 dB / 0 dB, an attenuator 4, and a cutoff frequency is 710 MHz. LPF5, HPF6 with a cut-off frequency of 470 MHz, input ATT switch 7 for switching the setting of the built-in input ATT to, for example, -10 dB / -5 dB / 0 dB, an amplifier 8, and a mixed amount Waveformer 9, amplifier 10, and upstream signal L that has a cutoff frequency of 60 MHz and allows upstream signals to pass PF11, two-pole three-throw switch SW1, double-pole double-throw switch SW2, DC blocking capacitors C1 to C11, high frequency blocking coils L1 to L4, resistor R1, diode D1, and second terminal T2 It has. In the two-pole three-throw switch SW1, the contact s and the contact s ′ are interlocked, and when the pole p and the contact a are connected by the contact s, the contact p s and the contact by the contact s ′ a 'is connected, and when the pole p and the contact b are connected by the contact s, the pole p' and the contact b 'are connected by the contact s', and the pole p and the contact c are connected by the contact s. Is connected to the pole p ′ and the contact c ′ by the contact s ′. Similarly, in the double-pole double-throw switch SW2, the contact s and the contact s ′ are interlocked, and when the pole p and the contact a are connected by the contact s, the contact s ′ causes the pole p ′. Are connected to each other, and when the pole p and the contact b are connected by the contact s, the pole p 'and the contact b' are connected by the contact s'.

  The first terminal T1 corresponds to the input terminal 101 (see FIG. 1), the two-pole three-throw switch SW1 corresponds to the optical operation / CATV / UHF switch 102 (see FIG. 1), and the two-pole three-throw switch. A circuit including the attenuator 4 provided between the contact point a ′ and the contact point b ′ of SW1 corresponds to the attenuation unit 104 (see FIG. 1), the amplifier 8 corresponds to the amplifier 107 (see FIG. 1), and the second The terminal T2 corresponds to the output terminal 108 (see FIG. 1).

  The first terminal T1 is connected to the input end of the downstream signal HPF2 and the output end of the upstream signal LPF11 via the LPF1.

  The output terminal of the downstream signal HPF2 is connected to the pole p of the two-pole three-throw switch SW1 via the DC blocking capacitor C1.

  The contact a and contact b of the 2-pole 3-throw switch SW1 are directly connected. The contact a of the 2-pole 3-throw switch SW1 is connected to the contact a ′ of the 2-pole 3-throw switch SW1 via the DC blocking capacitor C2, the input ATT switch 3, and the DC blocking capacitor C3. It is connected to the contact a ′ of the two-pole / three-throw switch SW1 through the high frequency blocking coil L1. Further, the contact a ′ of the 2-pole 3-throw switch SW1 is connected to the contact b of the 2-pole 3-throw switch SW1 via the DC blocking capacitor C4, the diode D1, the DC blocking capacitor C5, the attenuator 4, and the DC blocking capacitor C6. Connected to '. The anode of the diode D1 is connected to the contact b 'of the two-pole three-throw switch SW1 via the high frequency blocking coil L2, and the cathode of the diode D1 is connected to the ground potential via the resistor R1.

  The contact c of the two-pole / three-throw switch SW1 is connected to the pole p of the double-pole / double-throw switch SW2 via a DC blocking capacitor C7. The contact a and contact a 'of the double pole double throw switch SW2 are directly connected. The contact b of the double pole double throw switch SW2 is connected to the contact b 'of the double pole double throw switch SW2 via the LPF 5. The pole p 'of the double pole double throw switch SW2 is connected to the contact c' of the two pole three throw switch SW1 via the HPF 6, the input ATT switch 7, and the DC blocking capacitor C8.

  The pole p ′ of the two-pole / three-throw switch SW1 is connected to the input terminal of the amplifier 8 via a DC blocking capacitor C9. The output terminal of the amplifier 8 is connected to the second terminal T2 via the mixing demultiplexer 9 and the like.

  The input terminal of the amplifier 10 is connected to the second terminal T2 via the DC blocking capacitor C10, the mixing demultiplexer 9 and the like. The output terminal of the amplifier 10 is connected to the input terminal of the upstream signal LPF 11 via the DC blocking capacitor C11.

A DC voltage V _DC1 is applied to the pole p ′ of the two-pole three-throw switch SW1 via the high-frequency blocking coil L3. The pole p of the two-pole / three-throw switch SW1 is connected to the power supply terminal of the amplifier 10 through the high frequency blocking coil L4.

  The operation of the booster shown in FIG. 2 having the above configuration will be described.

  First, the operation when the first terminal T1 receives a high frequency signal from the CATV station will be described. In this case, the first terminal T1 serves as a CATV downstream input terminal and a CATV upstream output terminal, and the second terminal T2 serves as a CATV downstream output terminal and a CATV upstream input terminal. Further, in this case, the two-pole three-throw switch SW1 selects the contacts a and a ′ without selecting the contacts b, b ′, c, and c ′ by the operation of the two-pole three-throw switch SW1 by the user or the contractor. . As a result, the pole p and the contacts b and c are disconnected, the pole p ′ and the contacts b ′ and c ′ are disconnected, the pole p and the contact a are connected, and the pole p 'And contact a' are in the connected state, and the 2-pole 3-throw switch SW1 selects the CATV mode.

  The high-frequency signal from the CATV station inputted to the first terminal T1 is adjusted in level by the input ATT switch 3 after passing through the LPF 1 and the downstream signal HPF 2, further amplified by the amplifier 8, and finally the first signal 2 is output from the terminal T2.

Further, the DC voltage V _DC1 is the high frequency blocking coil L3, the pole p ′ of the 2-pole 3-throw switch SW1, the contact a ′ of the 2-pole 3-throw switch SW1, the contact of the high-frequency blocking coil L1, the 2-pole 3-throw switch SW1. a is supplied to the power supply terminal of the amplifier 10 through the pole p of the two-pole three-throw switch SW1 and the high-frequency blocking coil L4. As a result, the amplifier 10 is turned on. Therefore, the upstream signal that can be input to the second terminal T2 can be amplified by the amplifier 10 and finally output from the first terminal T1 to the CATV station.

  Next, an operation when the first terminal T1 inputs a high frequency signal from the V-ONU will be described. In this case, the first terminal T1 serves as an optical operation input terminal, and the second terminal T2 serves as an optical operation output terminal. Further, in this case, the two-pole three-throw switch SW1 selects the contacts b and b ′ without selecting the contacts a, a ′, c, and c ′ by the operation of the two-pole three-throw switch SW1 by the user or a contractor. To do. As a result, the pole p and the contacts a and c are disconnected, the pole p ′ and the contacts a ′ and c ′ are disconnected, the pole p and the contact b are connected, and the pole p 'And contact b' are in the connected state, and the two-pole three-throw switch SW1 selects the optical operation mode.

The level of the high-frequency signal from the V-ONU input to the first terminal T1 is adjusted by the input ATT switch 3 after passing through the LPF1 and the downstream signal HPF2, and the DC voltage _VDC1 is applied to the anode. The signal is attenuated by the attenuator 4 via the diode D1 in the on state, further amplified by the amplifier 8, and finally output from the second terminal T2.

Further, since the DC voltage V _DC1 is cut by the DC blocking capacitor C4, the DC voltage V _DC1 is not supplied to the power supply terminal of the amplifier 10. As a result, the amplifier 10 is turned off, and unnecessary power consumption of the amplifier 10 can be eliminated.

  Next, an operation when the first terminal T1 inputs a high frequency signal from the UHF antenna will be described. In this case, the first terminal T1 serves as a UHF input terminal, and the second terminal T2 serves as a UHF output terminal. Further, in this case, the two-pole three-throw switch SW1 selects the contacts c and c ′ without selecting the contacts a, a ′, b, and b ′ by the operation of the two-pole three-throw switch SW1 by the user or the contractor. To do. As a result, the pole p and the contacts a and b are disconnected, the pole p ′ and the contacts a ′ and b ′ are disconnected, the pole p and the contact c are connected, and the pole p 'And contact c' are in the connected state, and the two-pole three-throw switch SW1 selects the UHF mode.

  The high-frequency signal from the UHF antenna input to the first terminal T1 passes through LPF1 and downstream signal HPF2, and then through LPF5 when the double-pole double-throw switch SW2 selects the contacts a and a ′. If the double-pole double-throw switch SW2 selects the contacts b and b ′, the level is adjusted by the input ATT switch 7 via the LPF 5 and the HPF 6 and further amplified by the amplifier 8, and finally Are output from the second terminal T2.

Further, since the DC voltage V _DC1 is cut by the DC blocking capacitor C8, the DC voltage V _DC1 is not supplied to the power supply terminal of the amplifier 10. As a result, the amplifier 10 is turned off, and unnecessary power consumption of the amplifier 10 can be eliminated.

Second Embodiment
FIG. 3 is a block diagram showing a main configuration of a booster according to the second embodiment of the present invention. The booster according to the second embodiment of the present invention includes a first input terminal 201 for inputting a high frequency signal, a second input terminal 202 for inputting an intermediate frequency signal or a mixed signal of the intermediate frequency signal and the high frequency signal, Separate input / mixed input changeover switch 203 for switching between the separate input mode and the mixed input mode, the optical operation / CATV changeover switch 204 for switching between the optical operation mode and the CATV mode, the attenuation unit 205 for attenuating the high frequency signal, and the high frequency signal An amplifier 206 that amplifies the intermediate frequency signal, an amplifier 208 that amplifies the intermediate frequency signal, and a high frequency signal that is attenuated by the attenuation unit 205 and amplified by the amplifier 206 and is attenuated by the attenuation unit 207 A mixer 209 that mixes the intermediate frequency signal amplified by 208, and a mixer 209 And an output terminal 210 for outputting a signal.

  The attenuating unit 205 changes the attenuation amount according to the selection state of the optical operation / CATV switch 204. Specifically, the attenuating unit 205 has a greater optical operation mode when the optical operation / CATV switch 204 is selected than when the optical operation / CATV switch 204 is selected with the CATV mode. Increase attenuation. Note that the attenuation amount of the attenuation unit 205 may be zero when the CATV mode is selected by the optical operation / CATV switch 204.

  The attenuating unit 207 changes the attenuation amount according to the selection state of the separate input / mixing input changeover switch 203 and the selection state of the optical operation / CATV changeover switch 204. Specifically, when the mixed input mode is selected by the separate input / mixed input changeover switch 203 and the optical operation mode is selected by the optical operation / CATV changeover switch 204, the attenuating unit 207 Increase the amount of attenuation compared to the case. The attenuating unit 207 attenuates the attenuating unit 207 other than when the mixed input mode is selected by the separate input / mixed input switching switch 203 and the optical operation mode is selected by the optical operation / CATV switch 204. The quantity may be zero.

  The first input terminal 201 inputs a high-frequency signal from the V-ONU, and the second input terminal 202 receives a satellite broadcast intermediate frequency (CS / BS) from an LNB (Low Noise Block Converter) attached to the satellite broadcast receiving antenna. -IF) When inputting the signal, the user or the contractor operates the separate input / mixed input switch 203 so that the separate input / mixed input switch 203 selects the separate input mode, and switches the optical operation / CATV. The optical operation / CATV switch 204 is operated so that the switch 204 selects the optical operation mode.

  When the first input terminal 201 inputs a high frequency signal from the CATV station and the second input terminal 202 inputs a CS / BS-IF signal from the LNB attached to the satellite broadcast receiving antenna, the user or contractor Operates the separate input / mixed input switch 203 so that the separate input / mixed input switch 203 selects the separate input mode, and operates the optical operation so that the optical operation / CATV switch 204 selects the CATV mode. The / CATV selector switch 204 is operated.

  When the second input terminal 202 inputs a signal from a V-ONU that also outputs a CS / BS-IF signal (a mixed signal of a high-frequency signal and a CS / BS-IF signal), the user or the contractor must input another signal. Operate another input / mixed input changeover switch 203 so that the / mixed input changeover switch 203 selects the mixed input mode, and change the optical operation / CATV changeover so that the optical operation / CATV changeover switch 204 selects the optical operation mode. The switch 204 is operated. In addition, as V-ONU which also outputs a CS / BS-IF signal, the optical receiver installed in the personal residence currently disclosed by patent document 2, for example is mentioned.

  When the second input terminal 202 inputs a signal from a mixer (mixer that mixes a high-frequency signal from the CATV station and a CS / BS-IF signal from the LNB attached to the satellite broadcast receiving antenna), the user Alternatively, the contractor operates the separate input / mixed input switch 203 so that the separate input / mixed input switch 203 selects the mixed input mode, and the optical operation / CATV switch 204 selects the CATV mode. The optical operation / CATV switch 204 is operated.

  The high-frequency signal from the V-ONU has a higher signal level than the high-frequency signal from the CATV station, but when the optical operation mode is selected by the optical operation / CATV switch 204, the optical operation / CATV switch 204 is Since the attenuation amount of the attenuating unit 205 is larger than when the CATV mode is selected, the system change from the CATV system to the optical operation system or the optical operation system can be performed only by operating the optical operation / CATV switch 204. The system change from CATV system to CATV system can be easily realized.

  Further, the CS / BS-IF signal included in the signal from the V-ONU that also outputs the CS / BS-IF signal has a signal level compared to the CS / BS-IF signal from the LNB attached to the satellite broadcast receiving antenna. However, when the mixed input mode is selected by the separate input / mixed input selector switch 203 and the optical operation mode is selected by the optical operation / CATV switch switch 204, the attenuation is greater than in other cases. Since the attenuation amount of the unit 207 increases, the CS / BS-IF signal is also output from the system that does not use the V-ONU by only operating the separate input / mixed input changeover switch 203 and the optical operation / CATV changeover switch 204. System change to a system that uses a V-ONU that also outputs a BS-IF signal, or a system that uses a V-ONU that also outputs a CS / BS-IF signal. The system changes to the system that does not use the V-ONU also outputs CS / BS-IF signal can be easily realized from Temu.

  Next, an example of a booster according to the second embodiment of the present invention will be described. FIG. 4 is a circuit diagram showing an example of a booster according to the second embodiment of the present invention.

  The booster having the circuit configuration shown in FIG. 4 includes a first terminal T11, a second terminal T12, LPFs 12 and 13 having a cutoff frequency of 770 MHz, and a downstream having a cutoff frequency of 70 MHz and passing a downstream signal. The signal HPF 14, the attenuator 15, the amplifier 16, the mixer / demultiplexer 17, the amplifier 18, the upstream signal LPF 19 having a cutoff frequency of 60 MHz and allowing the upstream signal to pass, and the cutoff frequency is 770 MHz. LPF 20, CS / BS-IF signal HPF 21 having a cutoff frequency of 1032 MHz and allowing the CS / BS-IF signal to pass through, an attenuator 22, an amplifier 23, a mixer / demultiplexer 24, and a logic circuit (NAND circuit) ) 25, a logic circuit (NOT circuit) 26, and double-pole double-throw switches SW11 and SW12 A DC blocking capacitor C12 to C22, and diodes D11 to D15, a high frequency blocking coil L11～L17, includes a resistor R11 to R16, and a third terminal T13. In the double pole double throw switch SW11, the contact s and the contact s ′ are interlocked. When the pole p and the contact a are connected by the contact s, the contact p s and the contact a are connected by the contact s ′. Is connected, and when the pole p and the contact b are connected by the contact s, the pole p 'and the contact b' are connected by the contact s'. Similarly, in the double-pole double-throw switch SW12, the contact s and the contact s ′ are interlocked. When the pole p and the contact a are connected by the contact s, the contact p s ′ causes the pole p ′. Are connected to each other, and when the pole p and the contact b are connected by the contact s, the pole p 'and the contact b' are connected by the contact s'.

  The first terminal T11 corresponds to the first input terminal 201 (see FIG. 3), the second terminal T12 corresponds to the second input terminal 202 (see FIG. 3), and the double-pole double-throw switch SW11 is The double input double throw switch SW12 corresponds to the separate input / mixed input changeover switch 203 (see FIG. 3), the double pole double throw switch SW12 corresponds to the optical operation / CATV switch 204 (see FIG. 3), and the contact a and contact a of the double pole double throw switch SW12. And the attenuator 15 corresponds to the attenuating unit 205 (see FIG. 3), the amplifier 16 corresponds to the amplifier 206 (see FIG. 3), and the CS / BS-IF signal HPF 21 and the amplifier 23 are connected to each other. A circuit including the diodes D12 to D15 and the attenuator 22 provided therebetween corresponds to the attenuating unit 207 (see FIG. 3), the amplifier 23 corresponds to the amplifier 208 (see FIG. 3), and the mixed duplexer 24 is Corresponding to multiplexer 209 (see FIG. 3), the third terminal T13 corresponds to the output terminal 210 (see FIG. 3).

  The first terminal T11 is connected to the contact a and the contact b 'of the double-pole double-throw switch SW11 via the LPF 12 and the DC blocking capacitor C12. The pole p of the double pole double throw switch SW11 is connected to the input terminal of the downstream signal HPF 14 and the output terminal of the upstream signal LPF 19 via the DC blocking capacitor C13 and the LPF 13.

  The output terminal of the downstream signal HPF 14 is connected to the pole p of the double-pole double-throw switch SW12 via a DC blocking capacitor C14.

  The contact a and contact a 'of the double pole double throw switch SW12 are directly connected. The contact b of the double pole double throw switch SW12 is connected to the contact b 'of the double pole double throw switch SW12 via the attenuator 15 and the DC blocking capacitor C15.

  The pole p 'of the double-pole double-throw switch SW12 is connected to the input terminal of the amplifier 16 via a DC blocking capacitor C16. The output terminal of the amplifier 16 is connected to the third terminal T13 via the mixing demultiplexers 17 and 24 and the like.

  The input terminal of the amplifier 18 is connected to the third terminal T13 via the DC blocking capacitor C17, the mixing demultiplexers 17 and 24, and the like. The output terminal of the amplifier 18 is connected to the input terminal of the upstream signal LPF 19 via a DC blocking capacitor C18.

  The second terminal T12 is connected to the input end of the LPF 20 and the input end of the CS / BS-IF signal HPF 21. The output terminal of the LPF 20 is connected to the cathode of the diode D11 via the DC blocking capacitor C19, and the anode of the diode D11 is connected to the contact a 'and the contact b of the double-pole double-throw switch SW11.

  The output terminal of the CS / BS-IF signal HPF 21 is connected to the cathodes of the diodes D12 and D14. The anode of the diode D14 is connected to the anode of the diode D15 via the DC blocking capacitor C20, the attenuator 22, and the DC blocking capacitor C21. The anode of the diode D12 is connected to the anode of the diode D13, and the cathodes of the diodes D13 and D15 are connected to the third terminal T13 via the DC blocking capacitor C22, the amplifier 23, the mixing / branching filter 24, and the like. .

A DC voltage V _DC1 is applied to the pole p ′ of the double-pole double-throw switch SW12 via the high-frequency blocking coil L11. The pole p of the double-pole double-throw switch SW12 is connected to the power supply terminal of the amplifier 18 via the high-frequency blocking coil L12.

The DC voltage V _DC2 is applied to the pole p of the double-pole double-throw switch SW11 via the high-frequency blocking coil L13.

  The pole p 'of the double-pole double-throw switch SW11 is connected to the ground potential via a resistor R11 that is a terminating resistor. The cathode of the diode D11 is connected to the ground potential via a resistor R12 which is a bias resistor, and the cathodes of the diodes D12 and D14 are connected to the ground potential via a resistor R13 which is a bias resistor, and the cathodes of the diodes D13 and D15. Are connected to the ground potential via a resistor R14 which is a bias resistor. The contact b 'of the double-pole double-throw switch SW12 is connected to the ground potential via a resistor R15 that is a bias resistor. The contact b of the double-pole double-throw switch SW11 is connected to the ground potential via a resistor R16 that is a bias resistor.

The contact b of the double pole double throw switch SW11 is connected to the first input terminal IN1 of the logic circuit 25 via the high frequency blocking coil L14, and the contact b 'of the double pole double throw switch SW12 is logically connected via the high frequency blocking coil L15. Connected to the second input terminal IN2 of the circuit 25, the output terminal OUT of the logic circuit 25 is connected to the anodes of the diodes D12 and D13 and the input terminal of the logic circuit 26. The output terminal of the logic circuit 26 is connected to the anode of the diode D14 through the high frequency blocking coil L16, and is connected to the anode of the diode D15 through the high frequency blocking coil L17. Further, the DC voltage V _DC3 is supplied to the power supply terminal of the logic circuit 25, and the DC voltage V _DC4 is supplied to the power supply terminal of the logic circuit 26.

The logic circuit 25 is a NAND circuit that operates in positive logic. As shown in FIG. 5, the signal S _IN1 supplied to the first input terminal IN1 and the signal S _IN2 supplied to the second input terminal IN2 are provided. When both are at the High level, the signal S _OUT output from the output terminal OUT is set to the Low level, and the signal S _IN1 supplied to the first input terminal IN1 and the signal S _IN2 supplied to the second input terminal IN2 When at least one of them is at the low level, the signal _SOUT output from the output terminal OUT is set to the high level. The logic circuit 26 is a NOT circuit and inverts and outputs a signal supplied to the input terminal.

  The operation of the booster shown in FIG. 4 having the above configuration will be described.

  First, the operation when the first terminal T11 inputs a high frequency signal from the CATV station and the second terminal T12 inputs the CS / BS-IF signal from the LNB attached to the satellite broadcast receiving antenna will be described. . In this case, the first terminal T11 serves as a CATV downstream input terminal and a CATV upstream output terminal, the second terminal T12 serves as a CS / BS-IF input terminal, and a third terminal T13. Plays a role as a CATV downstream output terminal, a CATV upstream input terminal, and a CS / BS-IF output terminal. In this case, the double pole double throw switch SW11 selects the contacts a and a 'without selecting the contacts b and b' by the operation of the double pole double throw switch SW11 by the user or a contractor. As a result, the pole p and the contact b are disconnected, the pole p ′ and the contact b ′ are disconnected, the pole p and the contact a are connected, and the pole p ′ and the contact a ′. Are connected, and the double-pole double-throw switch SW11 selects another input mode. In this case, the double pole double throw switch SW12 selects the contacts a and a 'without selecting the contacts b and b' by the operation of the double pole double throw switch SW12 by the user or the contractor. As a result, the pole p and the contact b are disconnected, the pole p ′ and the contact b ′ are disconnected, the pole p and the contact a are connected, and the pole p ′ and the contact a ′. Are connected, and the double-pole double-throw switch SW12 selects the CATV mode.

  The high-frequency signal from the CATV station input to the first terminal T11 reaches the amplifier 16 via the LPFs 12 and 13 and the downstream signal HPF 14 and not via the attenuator 15, and is amplified by the amplifier 16. The signal is mixed with the CS / BS-IF signal by the mixing demultiplexer 24 and finally outputted from the third terminal T13.

  Since the anode of the diode D11 is connected to the ground potential via the contact a 'of the double-pole double-throw switch SW11, the pole p' of the double-pole double-throw switch SW11, and the resistor R11, the diode D11 is turned off.

Since the first input terminal IN1 of the logic circuit 25 is connected to the ground potential via the high frequency blocking coil L14, the contact b of the double pole double throw switch SW11, and the resistor R16, the first input terminal IN1 of the logic circuit 25 is connected. The signal _SIN1 supplied to the low level becomes low level. Since the second input terminal IN2 of the logic circuit 25 is connected to the ground potential via the high frequency blocking coil L15, the contact b ′ of the double-pole double-throw switch SW12, and the resistor R15, the second input terminal of the logic circuit 25 The signal SIN2 supplied to _IN2 is also at a low level. Therefore, the signal S _OUT output from the output terminal OUT of the logic circuit 25 becomes High level, and the diodes D12 and D13 are turned on. On the other hand, since the output signal of the logic circuit 26 becomes a low level, the diodes D14 and D15 are turned off.

  The CS / BS-IF signal input to the second terminal T12 passes through the CS / BS-IF signal HPF 21 and then passes through the diodes D12 and D13 which are in the ON state without passing through the attenuator 22. 23, amplified by the amplifier 23, further mixed with the high frequency signal by the mixing / branching filter 24, and finally outputted from the third terminal T 13.

Further, the DC voltage V _DC1 is the high frequency blocking coil L11, the pole p ′ of the double pole double throw switch SW12, the contact a ′ of the double pole double throw switch SW12, the contact a of the double pole double throw switch SW12, and the pole p of the double pole double throw switch SW12. And the power supply terminal of the amplifier 18 via the high frequency blocking coil L12. As a result, the amplifier 18 is turned on. Therefore, the upstream signal that can be input to the third terminal T13 can be amplified by the amplifier 18 and finally output from the first terminal T11 to the CATV station.

  Next, the operation when the first terminal T11 inputs a high frequency signal from the V-ONU and the second terminal T12 inputs the CS / BS-IF signal from the LNB attached to the satellite broadcast receiving antenna. explain. In this case, the first terminal T11 serves as an optical operation input terminal, the second terminal T12 serves as a CS / BS-IF input terminal, and the third terminal T13 serves as an optical operation output. It plays a role as a terminal and a CS / BS-IF output terminal. In this case, the double pole double throw switch SW11 selects the contacts a and a 'without selecting the contacts b and b' by the operation of the double pole double throw switch SW11 by the user or a contractor. As a result, the pole p and the contact b are disconnected, the pole p ′ and the contact b ′ are disconnected, the pole p and the contact a are connected, and the pole p ′ and the contact a ′. Are connected, and the double-pole double-throw switch SW11 selects another input mode. In this case, the double pole double throw switch SW12 selects the contacts b and b 'without selecting the contacts a and a' by the operation of the double pole double throw switch SW12 by the user or the contractor. As a result, the pole p and the contact a are disconnected, the pole p ′ and the contact a ′ are disconnected, the pole p and the contact b are connected, and the pole p ′ and the contact b ′ are connected. Are connected, and the double-pole double-throw switch SW12 selects the optical operation mode.

  The high-frequency signal from the V-ONU input to the first terminal T11 passes through the LPFs 12 and 13 and the downstream signal HPF 14, reaches the amplifier 16 through the attenuator 15, is amplified by the amplifier 16, and is further amplified. The signal is mixed with the CS / BS-IF signal by the mixing demultiplexer 24 and finally outputted from the third terminal T13.

  Since the anode of the diode D11 is connected to the ground potential via the contact a 'of the double-pole double-throw switch SW11, the pole p' of the double-pole double-throw switch SW11, and the resistor R11, the diode D11 is turned off.

Since the first input terminal IN1 of the logic circuit 25 is connected to the ground potential via the high frequency blocking coil L14, the contact b of the double pole double throw switch SW11, and the resistor R16, the first input terminal IN1 of the logic circuit 25 is connected. The signal _SIN1 supplied to the low level becomes low level. The DC voltage V _DC1 is connected to the second input terminal IN2 of the logic circuit 25 via the high frequency blocking coil L15, the contact b ′ of the double pole double throw switch SW12, the pole p ′ of the double pole double throw switch SW12, and the high frequency blocking coil L11. Therefore, the signal S _IN2 supplied to the second input terminal IN2 of the logic circuit 25 becomes High level. Therefore, the signal S _OUT output from the output terminal OUT of the logic circuit 25 becomes High level, and the diodes D12 and D13 are turned on. On the other hand, since the output signal of the logic circuit 26 becomes a low level, the diodes D14 and D15 are turned off.

  The CS / BS-IF signal input to the second terminal T12 passes through the CS / BS-IF signal HPF 21 and then passes through the diodes D12 and D13 which are in the ON state without passing through the attenuator 22. 23, amplified by the amplifier 23, further mixed with the high frequency signal by the mixing / branching filter 24, and finally outputted from the third terminal T 13.

Further, since the DC voltage V _DC1 is cut by the DC blocking capacitor C15, the DC voltage V _DC1 is not supplied to the power supply terminal of the amplifier 18. Thereby, the amplifier 18 is turned off, and unnecessary power consumption of the amplifier 18 can be eliminated.

  Next, the operation when the second terminal T12 inputs a signal (mixed signal of a high-frequency signal and a CS / BS-IF signal) from the V-ONU that also outputs a CS / BS-IF signal will be described. In this case, the second terminal T12 serves as an optical operation input terminal and a CS / BS-IF input terminal, and the third terminal T13 serves as an optical operation output terminal and a CS / BS-IF output terminal. Take on. In this case, the double pole double throw switch SW11 selects the contacts b and b 'without selecting the contacts a and a' by the operation of the double pole double throw switch SW11 by the user or a contractor. As a result, the pole p and the contact a are disconnected, the pole p ′ and the contact a ′ are disconnected, the pole p and the contact b are connected, and the pole p ′ and the contact b ′ are connected. Are connected, and the double-pole double-throw switch SW11 selects the mixed input mode. In this case, the double pole double throw switch SW12 selects the contacts b and b 'without selecting the contacts a and a' by the operation of the double pole double throw switch SW12 by the user or the contractor. As a result, the pole p and the contact a are disconnected, the pole p ′ and the contact a ′ are disconnected, the pole p and the contact b are connected, and the pole p ′ and the contact b ′ are connected. Are connected, and the double-pole double-throw switch SW12 selects the optical operation mode.

Since the DC voltage V _DC2 is supplied to the anode of the diode D11 via the contact b of the double-pole double-throw switch SW11, the pole p of the double-pole double-throw switch SW11, and the high frequency blocking coil L13, the diode D11 is turned on. .

  The high-frequency signal included in the mixed signal input to the second terminal T12 passes through the LPF 20 and the diode D11 in the ON state, passes through the LPF 13 and the downstream signal HPF 14, and then passes through the attenuator 15 to the amplifier 16. The signal is amplified by the amplifier 16, further mixed with the CS / BS-IF signal by the mixing / branching filter 24, and finally output from the third terminal T 13.

The DC voltage V _DC2 is applied to the first input terminal IN1 of the logic circuit 25 via the high frequency blocking coil L14, the contact b of the double pole double throw switch SW11, the pole p of the double pole double throw switch SW11, and the high frequency blocking coil L13. Since the signal is supplied, the signal S _IN1 supplied to the first input terminal IN1 of the logic circuit 25 becomes High level. The DC voltage V _DC1 is connected to the second input terminal IN2 of the logic circuit 25 via the high frequency blocking coil L15, the contact b ′ of the double pole double throw switch SW12, the pole p ′ of the double pole double throw switch SW12, and the high frequency blocking coil L11. Therefore, the signal S _IN2 supplied to the second input terminal IN2 of the logic circuit 25 is also at the high level. Therefore, the signal S _OUT output from the output terminal OUT of the logic circuit 25 becomes the low level, and the diodes D12 and D13 are turned off. On the other hand, since the output signal of the logic circuit 26 becomes High level, the diodes D14 and D15 are turned on.

  The CS / BS-IF signal included in the mixed signal in the second terminal T12 passes through the CS / BS-IF signal HPF 21, and then the diode D14 in the ON state, the attenuator 22 and the diode D15 in the ON state. , Reaches the amplifier 23, is amplified by the amplifier 23, is further mixed with the high frequency signal by the mixing / branching filter 24, and is finally output from the third terminal T13.

Further, since the DC voltage V _DC1 is cut by the DC blocking capacitor C15, the DC voltage V _DC1 is not supplied to the power supply terminal of the amplifier 18. Thereby, the amplifier 18 is turned off, and unnecessary power consumption of the amplifier 18 can be eliminated.

  Finally, the second terminal T12 inputs a signal from a mixer (mixer that mixes a high-frequency signal from the CATV station and a CS / BS-IF signal from the LNB attached to the satellite broadcast receiving antenna). Will be described. In this case, the second terminal T12 serves as a CATV downstream input terminal, a CATV upstream output terminal, and a CS / BS-IF input terminal, and the third terminal T13 includes a CATV downstream output terminal and a CATV upstream input terminal. , And the CS / BS-IF output terminal. In this case, the double pole double throw switch SW11 selects the contacts b and b 'without selecting the contacts a and a' by the operation of the double pole double throw switch SW11 by the user or a contractor. As a result, the pole p and the contact a are disconnected, the pole p ′ and the contact a ′ are disconnected, the pole p and the contact b are connected, and the pole p ′ and the contact b ′ are connected. Are connected, and the double-pole double-throw switch SW11 selects the mixed input mode. In this case, the double pole double throw switch SW12 selects the contacts a and a 'without selecting the contacts b and b' by the operation of the double pole double throw switch SW12 by the user or the contractor. As a result, the pole p and the contact b are disconnected, the pole p ′ and the contact b ′ are disconnected, the pole p and the contact a are connected, and the pole p ′ and the contact a ′. Are connected, and the double-pole double-throw switch SW12 selects the CATV mode.

Since the DC voltage V _DC2 is supplied to the anode of the diode D11 via the contact b of the double-pole double-throw switch SW11, the pole p of the double-pole double-throw switch SW11, and the high frequency blocking coil L13, the diode D11 is turned on. .

  The high frequency signal included in the mixed signal input to the second terminal T12 passes through the LPF 20 and the diode D11 that is in the ON state, passes through the LPF 13 and the downstream signal HPF 14, and then does not pass through the attenuator 15. , Is amplified by the amplifier 16, further mixed with the CS / BS-IF signal by the mixing / branching filter 24, and finally output from the third terminal T 13.

The DC voltage V _DC2 is applied to the first input terminal IN1 of the logic circuit 25 via the high frequency blocking coil L14, the contact b of the double pole double throw switch SW11, the pole p of the double pole double throw switch SW11, and the high frequency blocking coil L13. Since the signal is supplied, the signal S _IN1 supplied to the first input terminal IN1 of the logic circuit 25 becomes High level. Since the second input terminal IN2 of the logic circuit 25 is connected to the ground potential via the high frequency blocking coil L15, the contact b ′ of the double-pole double-throw switch SW12, and the resistor R15, the second input terminal of the logic circuit 25 The signal SIN2 supplied to _IN2 becomes Low level. Therefore, the signal S _OUT output from the output terminal OUT of the logic circuit 25 becomes High level, and the diodes D12 and D13 are turned on. On the other hand, since the output signal of the logic circuit 26 becomes a low level, the diodes D14 and D15 are turned off.

  The CS / BS-IF signal included in the mixed signal at the second terminal T12 passes through the CS / BS-IF signal HPF 21, and then passes through the diodes D12 and D13 which are in the ON state without passing through the attenuator 22. Then, the signal reaches the amplifier 23, is amplified by the amplifier 23, is further mixed with the high frequency signal by the mixer / demultiplexer 24, and is finally output from the third terminal T13.

Further, the DC voltage V _DC1 is the high frequency blocking coil L11, the pole p ′ of the double pole double throw switch SW12, the contact a ′ of the double pole double throw switch SW12, the contact a of the double pole double throw switch SW12, and the pole p of the double pole double throw switch SW12. And the power supply terminal of the amplifier 18 via the high frequency blocking coil L12. As a result, the amplifier 18 is turned on. Therefore, the upstream signal that can be input to the third terminal T13 can be amplified by the amplifier 18 and finally output from the first terminal T11 to the CATV station.

<Others>
The booster according to the first embodiment of the present invention described above is a booster that can handle a high-frequency signal from a UHF antenna, but may be a booster that does not support a high-frequency signal from a UHF antenna. As a configuration not corresponding to the high frequency signal from the UHF antenna, for example, as shown in FIG. 6, an optical operation / CATV change-over switch in which the booster switches between the input terminal 101 for inputting the high frequency signal and the optical operation mode and the CATV mode. 102 ′, an attenuating unit 103 that attenuates a high-frequency signal, an amplifier 104 that amplifies the high-frequency signal, and an output terminal 105 that outputs the high-frequency signal that is attenuated by the attenuating unit 103 and amplified by the amplifier 104. . Then, the attenuation unit 103 changes the attenuation amount according to the selection state of the optical operation / CATV switch 102 ′. Specifically, the attenuating unit 103 is more in the optical operation / CATV switch 102 ′ when the optical operation mode is selected than in the optical operation / CATV switch 102 ′ when the CATV mode is selected. To increase the attenuation. Note that the attenuation amount of the attenuation unit 103 may be zero when the CATV mode is selected by the optical operation / CATV switch 102 ′.

  In addition, the booster according to the first embodiment of the present invention described above is an input terminal different from the input terminal 101, for example, as shown in FIG. 7, and is an intermediate frequency signal or a mixture of an intermediate frequency signal and a high frequency signal. Another input terminal 301 for inputting a signal, and another input / mixing provided between the input terminal 101 and the other input terminal 301 and the optical operation / CATV / UHF switching 102 to switch between another input mode and mixed input mode. An input changeover switch 302, an input ATT switch 303 provided between another input terminal 301 and an amplifier 304 described later, an amplifier 304 for amplifying an intermediate frequency signal sent from the input ATT switch 303, and an amplifier The mixer 3 that mixes the high frequency signal sent from the 107 and the intermediate frequency signal sent from the amplifier 304 and outputs the mixed signal to the output terminal 108. 5 and may be added.

  Examples of the intermediate frequency signal input from the other input terminal 301 include a CS / BS-IF signal. In addition, as a mixed signal of the intermediate frequency signal and the high frequency signal input by the other input terminal 301, for example, a signal from a V-ONU that also outputs a CS / BS-IF signal, or attached to a satellite broadcast receiving antenna The mixed signal of the CS / BS-IF signal from the LNB and the high frequency signal from the CATV station, or the CS / BS-IF signal from the LNB attached to the satellite broadcast receiving antenna and the high frequency signal from the UHF antenna A mixed signal may be mentioned. The input ATT built in the input ATT switch 303 has a high input level at another input terminal 301 (for example, a signal from a V-ONU that also outputs a CS / BS-IF signal is input to another input ATT). Attenuation (for example, −10 dB) is set when the terminal 301 inputs.

  The booster according to the second embodiment of the present invention described above is a booster to which a high-frequency signal from a CATV station can be input. For example, a high-frequency signal from a UHF antenna is used instead of a high-frequency signal from a CATV station. It may be a booster that can be input.

  In the booster according to the second embodiment of the present invention described above, the first terminal T11 inputs a high-frequency signal from the UHF antenna, and the second terminal T12 is a CS from the LNB attached to the satellite broadcast receiving antenna. It is also possible to use in a usage form in which a / BS-IF signal is input. In this case, the first terminal T11 serves as a UHF input terminal, the second terminal T12 serves as a CS / BS-IF input terminal, and the third terminal T13 includes a UHF output terminal and It plays a role as a CS / BS-IF output terminal. In this case, the double pole double throw switch SW11 selects the contacts a and a 'without selecting the contacts b and b' by the operation of the double pole double throw switch SW11 by the user or a contractor. As a result, the pole p and the contact b are disconnected, the pole p ′ and the contact b ′ are disconnected, the pole p and the contact a are connected, and the pole p ′ and the contact a ′. Are connected, and the double-pole double-throw switch SW11 selects another input mode. In this case, the double pole double throw switch SW12 selects the contacts a and a 'without selecting the contacts b and b' by the operation of the double pole double throw switch SW12 by the user or the contractor. As a result, the pole p and the contact b are disconnected, the pole p ′ and the contact b ′ are disconnected, the pole p and the contact a are connected, and the pole p ′ and the contact a ′. Are connected, and the double-pole double-throw switch SW12 is in the CATV mode (in this case, the name is the CATV mode, but is actually the UHF mode. The attenuation amount of the attenuation unit is the same in the CATV mode and the UHF mode. Therefore, in the double pole double throw switch SW12, the CATV mode and the UHF mode are set to the same mode.).

1, 5, 12, 13, 19 LPF
2,14 Downstream signal HPF
3, 7 Input ATT switch 4, 15, 22 Attenuator 6 HPF
8, 10, 16, 18, 23 Amplifier 9, 17, 24 Mixing demultiplexer 11, 19 Upstream signal LPF
21 HP for CS / BS-IF signal
25, 26 Logic circuit 101 Input terminal 102 Optical operation / CATV / UHF selector switch 102 ', 204 Optical operation / CATV selector switch 103, 106, 303 Input ATT switch 104, 205, 207 Attenuator 105 Frequency selector switch 107, 206 208, 304 Amplifier 108, 210 Output terminal 201 First input terminal 202 Second input terminal 203, 302 Separate input / mixed input switch 204 Optical operation / CATV switch 209, 305 Mixer 301 Other input terminal C1 ~ C22 DC blocking capacitors D1, D11 to D15 Diodes L1 to L4, L11 to L17 High frequency blocking coils R1, R11 to R16 Resistors SW1 Two pole three throw switches SW2, SW11, SW12 Double pole double throw switches T1, T11 First end T2, T12 the second terminal T13 the third terminal

Claims (2)

A first input terminal for inputting a high-frequency signal;
A second input terminal for inputting an intermediate frequency signal or a mixed signal of the intermediate frequency signal and the high frequency signal;
A first mode corresponding to a case where the high frequency signal is input to the first input terminal and the intermediate frequency signal is input to the second input terminal, and the mixed signal is input to the second input terminal A first switch for selecting one of the second modes corresponding to the case;
A second switch for selecting one mode from a plurality of modes corresponding to the type of the high-frequency signal input to the first input terminal or the second input terminal;
A first attenuation unit for changing an attenuation amount for attenuating the high-frequency signal according to a selection state of the second switch;
A booster, comprising: a second attenuation unit that changes an attenuation amount for attenuating the intermediate frequency signal according to a selection state of the first switch and a selection state of the second switch. An upstream signal amplifying unit for amplifying the upstream signal;
The first input terminal or the second input terminal outputs the upstream signal amplified by the upstream signal amplification unit,
2. The booster according to claim 1, wherein ON / OFF of power supply to the upstream signal amplification unit is switched according to a selection state of the second switch.

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