JP2011029909A - Booster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To switch a bidirectional booster, which amplifies a high frequency signal in a frequency band in the downlink direction, and amplifies a high frequency in a frequency band in the uplink direction, to a booster for a downlink frequency band different from the downlink frequency band range by one operation. <P>SOLUTION: A downlink amplification stage 18 amplifies a downlink CATV signal supplied to an input terminal 2 to be supplied to an output terminal 22. An uplink amplification stage 24 operates when operating current is supplied, amplifies the CATV signal supplied to the output terminal 22 to be supplied to the input terminal 2. A contact 10a of a changeover switch 10 is connected to the input terminal 2 and a power terminal of the uplink amplification stage 24, a contact 10b of the changeover switch 10 is connected to the input side of the downlink amplification stage 18, and connected to a DC power supply. The changeover switch 10 is switched to a state that the contacts 10a, 10b are directly connected and a state that a band pass filter 14 which passes through a television broadcasting signal in a UHF band and a DC circuit of DC blocking capacitors 12a, 12b are connected between the contacts 10a, 10b when a UHF band television signal is supplied to the input terminal 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a booster, and more particularly, to a booster that can be used for both directions and for a single direction.

  In recent years, in terrestrial television broadcasting, digital broadcasting has been started in addition to analog broadcasting, and analog broadcasting will end in 2011. Therefore, Patent Document 1 discloses a booster configured to amplify both analog broadcast and digital broadcast signals and to amplify only digital broadcast signals after 2011. .

  In the booster disclosed in Patent Document 1, a VHF band amplifier that amplifies a VHF band signal in which analog broadcasting is currently performed, and a UHF band that amplifies a UHF band signal in which digital broadcasting and analog broadcasting are currently performed. The amplifier for the UHF band is configured so that the operating current is always supplied from the power supply, and the amplifier for the VHF band is configured to be supplied with the operating current via the open / close switch. ing. After 2011, the VHF band amplifier is stopped by operating the open / close switch.

JP 2008-278374 A

  Although the booster of patent document 1 is a unidirectional booster, a bidirectional | two-way booster also exists. The bidirectional booster is also provided with an upstream amplifier that amplifies the upstream signal transmitted from the terminal side to the headend device. When a bidirectional amplifier is used as a unidirectional booster dedicated to terrestrial digital broadcasting, the upstream amplifier must also be stopped. The technique of Patent Document 1 cannot cope with such a case, and when the technique of Patent Document 1 is applied to a bidirectional booster, a switch for stopping the upstream amplifier is newly provided. There is a need.

  The present invention provides a bidirectional booster capable of amplifying a high-frequency signal in the downstream frequency band and amplifying a high-frequency signal in the upstream frequency band by a single operation. The object is to be able to switch to a booster for the frequency band.

  The booster of one embodiment of the present invention is supplied with a first terminal to which a high-frequency signal in the first frequency band or a high-frequency signal in the second frequency band is supplied, and a high-frequency signal in the third frequency band. A second terminal. For example, a downlink CATV signal can be used as the high frequency signal in the first frequency band, and a digital terrestrial television broadcast signal in the UHF band can be used as the high frequency signal in the second frequency band, for example. The UHF band is still used for terrestrial digital broadcasting after 2011. As the third frequency band, for example, an upstream CATV signal of 10 MHz to 60 MHz band is used. The input of the first amplifying means is connected to the first terminal side, the output of the first amplifying means is connected to the second terminal side, and the high frequency signal of the first frequency band supplied from the first terminal or The high frequency signal in the second frequency band is amplified by the first amplifying means and supplied to the second terminal. When the operating current is supplied to the power supply terminal, the second amplifying means operates, the input of the second amplifying means is connected to the second terminal side, and the output of the second amplifying means is connected to the first terminal side. When the third high-frequency signal is supplied to the second terminal, the second amplifying means amplifies it and supplies it to the first terminal. A series circuit of a DC blocking unit and a filter unit that blocks the high frequency signal in the first frequency band and passes the high frequency signal in the second frequency band is provided. The switching means has a third terminal and a fourth terminal, the third terminal is connected to the first terminal and the power supply terminal of the second amplification means, and the fourth terminal is the first terminal. Connected to the input of the amplifying means and connected to the DC power supply terminal. The switching means assumes that the third and fourth terminals are selected from the first and second states. In the first state, the third and fourth terminals are connected, and in the second state, the third and fourth terminals are connected. The series circuit is connected between the third and fourth terminals.

  In the booster configured as described above, when the switching means is in the first state, a direct current flows from the direct current power supply terminal connected to the fourth terminal to the third terminal, and the second amplification from the third terminal. A direct current flows through the power supply terminal of the means, and the second amplifying means operates. Therefore, the high frequency signal in the third frequency band from the second terminal is amplified by the second amplifying means and output from the first terminal. The high frequency signal in the first frequency band from the first terminal is supplied from the third terminal of the switching means in the first state to the fourth terminal, and further supplied to the input side of the first amplifying means. Is done. As a result, the high frequency signal in the first frequency band is amplified by the first amplifying means and supplied from the second terminal. When the switching means is switched to the second state, the current from the DC power supply terminal is blocked by the DC blocking means of the DC circuit connected to the third and fourth terminals of the switching means, and the power supply of the second amplifier means It is not supplied to the terminal. As a result, the second amplifying means does not operate, and the high frequency signal in the third frequency band is not supplied to the first terminal. On the other hand, the high frequency signal of the second frequency band supplied to the first terminal passes through the filter means of the series circuit connected between the third and fourth terminals of the switching means, and the first amplifying means. , Amplified here, and supplied to the second terminal. Thus, by switching the switching means from the first state to the second state, the high frequency signal in the first frequency band has been amplified by the first amplification means until now, and the high frequency signal in the third frequency band has been It is possible to switch from the state amplified by the second amplifying means to the state where only the high-frequency signal in the second frequency band is amplified.

  An opening / closing means may be provided between the power supply terminal and the fourth terminal. With this configuration, for example, when the switching means opens the opening / closing means in the first state, the supply of direct current to the second amplifying means is stopped, and the second amplifying means is stopped. Therefore, only the high frequency signal in the first frequency band can be amplified.

  The booster according to another aspect of the present invention includes a first terminal, a second terminal, a first amplifying unit, and a second amplifying unit, similarly to the booster described above. Further, a series circuit of a first filter means for blocking the high-frequency signal in the first frequency band and allowing the high-frequency signal in the second frequency band to pass therethrough and a first DC blocking means is provided. The switching means is configured to be switchable to any one of the first to third states. In the first state, the third and fourth terminals are connected, and in the second state, between the third and fourth terminals. And the second DC blocking means is connected between the third and fourth terminals in the third state.

  When the switching means is in the first and second states, the booster configured as described above operates in the same manner as the booster of the above aspect. In the third state, since the second DC blocking means is connected between the third and fourth terminals, no DC current is supplied to the second amplifying means, and the second amplifying means stops, The high frequency signal in the third frequency band is not amplified. Therefore, in the first state, the high frequency signals in the first and third frequency bands are amplified, in the second state, only the high frequency signal in the second frequency band is amplified, and in the third state, the first frequency band A high frequency signal in the frequency band is amplified.

  In series with the second direct current blocking means, a second filter means for passing a high-frequency signal in a fourth frequency band, for example, UHF band and VHF band may be provided. If comprised in this way, it can be set as the state which amplifies only the high frequency signal of a 4th frequency band in a 3rd state.

  As described above, according to the present invention, a bidirectional booster that can amplify a high-frequency signal in two different frequency bands in the downstream direction and amplify a high-frequency signal in one frequency band in the upstream direction can be switched. Only by a simple operation of switching means, it is possible to switch to a booster for one downstream frequency band.

It is a block diagram of the booster of the 1st Embodiment of this invention. It is a figure which shows the state from which the frequency band of the signal which passes the booster of FIG. 1 changes by switching of the selector switch of the booster of FIG. It is a block diagram of the booster of the 2nd Embodiment of this invention.

  The booster according to the first embodiment of the present invention has a first terminal, for example, an input terminal 2. The input terminal 2 is supplied with a high-frequency signal in the first frequency band, for example, a downstream CATV signal (70 to 770 MHz) as a downstream signal from a head end device provided on the center side of a CATV facility (not shown). The downstream CATV signal includes an analog television broadcast signal and a digital television broadcast signal. Accordingly, an analog television broadcast signal and a digital television broadcast signal are supplied to the input terminal 2 until 2011, but from 2011, a high-frequency signal in the second frequency band, for example, a terrestrial digital television in the UHF band. Only the broadcast signal is supplied to the input terminal 2.

  This downstream CATV signal is supplied to the input side of the filter means, for example, the bandpass filter 6 via the demultiplexing mixer 4. The band pass filter 6 has a pass band set so as to pass a signal of 70 MHz to 770 MHz that is a frequency band of the downlink CATV signal.

  The output side of the band pass filter 6 is supplied to a switching means, for example, a third terminal of the changeover switch 10, for example, a contact 10a, via a direct current blocking means, for example, a direct current blocking capacitor 8. The changeover switch 10 also has a fourth terminal, for example, a contact 10b. In addition, contacts 10d and 10e are connected to the contact 10a via the contact 10c, and contacts 10g and 10h are connected to the contact 10b via the contact 10f. The contacts 10c and 10f are interlocked. In the first state where the contact 10a and the contact 10d are connected by the contact 10c, the contact 10b and the contact 10g are connected by the contact 10f. In the second state in which the contact 10a and the contact 10e are connected by the contact 10c, the contact 10b and the contact 10h are connected by the contact 10f.

  In the changeover switch 10, the contact point 10d and the contact point 10g are connected to each other. A series circuit is connected between the contact 10e and the contact 10h. This series circuit is a series circuit of two DC blocking means, for example, DC blocking capacitors 12a, 12b, and a first filter means, for example, a bandpass filter 14. The band-pass filter 14 has a cutoff frequency selected so as to pass a UHF band television broadcast signal or a digital television broadcast signal in the UHF band television broadcast signal. A DC blocking capacitor 12a is connected to the input side of the bandpass filter 14, and a DC blocking capacitor 12b is connected to the output side. The DC blocking capacitor 12a is connected to the contact 10e, and the DC blocking capacitor 12b is connected to the contact 10h.

  The contact 10b is connected to a first amplifying means, for example, a downstream amplifying stage 18, via a DC blocking means, for example, a DC blocking capacitor 16. The downstream amplification stage 18 is of a wide band capable of amplifying the downstream CATV signal in the downstream CATV frequency band. The output signal of the downstream amplification stage 18 is supplied to the second terminal, for example, the output terminal 22 via the demultiplexing mixer 20.

  The output terminal 22 is supplied with a high frequency signal in the third frequency band, for example, an upstream CATV signal (10 MHz to 60 MHz band). This upstream CATV signal is amplified by the second amplification means, for example, the upstream amplification stage 24, and is supplied to the input terminal 2 via the demultiplexing mixer 4.

  The power supply terminal of the upstream amplification stage 24 is connected to the contact 10a via a high frequency blocking means, for example, a high frequency blocking coil 26. The contact 10b is connected to switching means, for example, the contact 30a of the changeover switch 30, via high frequency blocking means, for example, a high frequency blocking coil 28.

  The changeover switch 30 also has a contact 30b, which is connected to a DC power source (not shown). In addition, the changeover switch 30 has contacts 30d and 30e that can be connected to the contact 30a via the contact 30c, and further has contacts 30g and 30h that can be connected to the contact 30b via the contact 30f. Yes. The contacts 30c and 30f are interlocked, and in the state where the contact 30a and the contact 30d are connected by the contact 30c, the contact 30b and the contact 30g are connected by the contact 30f. In a state where the contact 30a and the contact 30e are connected by the contact 30c, the contact 30b and the contact 30h are connected by the contact 30f.

  The contacts 30d and 30g are vacant contacts, and the contacts 30e and 30h are connected to each other. Accordingly, in the state where the contact 30a is connected to the contact 30d by the contact 30c and the contact 30b is connected to the contact 30g by the contact 30f, the direct current from the DC power supply is not supplied to the contact 10b of the changeover switch 10. However, in the state where the contact 30a is connected to the contact 30e by the contact 30c and the contact 30b is connected to the contact 30h by the contact 30f, the direct current from the DC power source is changed from the contact 30b to the contact 30f and the contact 30h. , The contact 30e, the contact 30c, the contact 30a, and the high frequency blocking coil 28 are supplied to the contact 10b of the changeover switch 10. That is, the changeover switch 30 functions as an opening / closing means.

  In the booster configured as described above, as shown in FIG. 2A, the downstream CATV signal supplied from the input terminal 2 is amplified by the downstream amplification stage 18, supplied to the output terminal 22, and supplied to the output terminal 22. When the upstream CATV signal is amplified by the upstream amplification stage 24 and supplied to the input terminal 2, the contacts 10a and 10d of the changeover switch 10 are operated as shown in FIG. The contacts 10b and 10g are connected. Further, the contacts 30c and 30f of the changeover switch 30 are operated to connect the contact 30a and the contact 30e, and connect the contact 30b and the contact 30h. In this state, the downstream CATV signal supplied to the input terminal 2 is supplied to the contact 10a of the changeover switch 10 after unnecessary signal components are removed from the demultiplexing mixer 4 by the bandpass filter 6, and further contacted. 10 c, contact 10 d, contact 10 g, contact 10 f, contact 10 b, DC blocking capacitor 16, supplied to downstream amplification stage 18, amplified here, and then supplied to output terminal 22 via demultiplexing mixer 20. Is done.

  On the other hand, the direct current from the direct current power source is supplied to the contact 10b of the changeover switch 10 as described above. This direct current is supplied to the power supply terminal of the upstream amplification stage 24 through the contact 10f, the contact 10g, the contact 10d, the contact 10c, the contact 10a, and the high frequency blocking coil 26. As a result, the upstream amplification stage 24 operates. The upstream signal supplied from the output terminal 22 to the upstream amplification stage 24 via the branching mixer 20 is amplified and supplied to the input terminal 2 via the branching mixer 4.

  When a downstream CATV signal is amplified without amplifying the upstream CATV signal as shown in FIG. 2B, the contacts 10c and 10f are operated in the changeover switch 10 to connect the contacts 10a and 10d. And the contact 10b and the contact 10g are connected. Further, the contacts 30c and 30f of the changeover switch 30 are operated to connect the contact 30a and the contact 30d, and connect the contact 30b and the contact 30g. In this state, the downstream CATV signal supplied to the input terminal 2 is amplified by the downstream amplification stage 18 via the changeover switch 10 and supplied to the output terminal 22 in the same manner as described above.

  On the other hand, in the changeover switch 30, as described above, the contact 30c connects the contact 30a and the contact 30d, and the contact 30f connects the contact 30b and the contact 30g. It is not supplied to the contact 10b of the changeover switch 10, and the upstream amplification stage 24 does not operate. Therefore, in the connection state of the changeover switches 10 and 30, the upstream CATV signal is not amplified, and only the downstream CATV signal is amplified.

  When only the UHF band television broadcast signal including the digital television broadcast signal is amplified as shown in FIG. 2 (c), the contacts 10c and 10f are operated to connect the contacts 10a and 10e, and Contacts 10b and 10h are connected. At this time, it is assumed that the contacts 30c and 30f of the changeover switch 30 are operated so that the contacts 30a and 30e are connected and the contacts 30b and 30h are connected. As a result, a direct current is supplied to the contact 10b of the changeover switch 10, but this current is blocked by the DC blocking capacitors 12a and 12b and does not flow to the contact 10a. As a result, the upstream amplification stage 24 does not operate and the upstream CATV signal is not amplified.

  On the other hand, a digital television broadcast signal in the UHF band from the input terminal 2 is converted into a demultiplexing mixer 4, a bandpass filter 6, a DC blocking capacitor 8, a contact 10a of a changeover switch 10, a contact 10c, a contact 10e, and a DC blocking capacitor. It is supplied to the band pass filter 14 via 12a. The band-pass filter 14 extracts a UHF band digital television broadcast signal, which is supplied to the downstream amplification stage 18 via the DC blocking capacitor 12b, the contact 10h, the contact 10f, the contact 10b, and the DC blocking capacitor 16, Amplified by the amplification stage 18 and supplied to the output terminal 22 via the demultiplexing mixer 20. Signals other than digital television broadcast signals in the UHF band are blocked by the band pass filter 14.

  In the state where the contact 30a is connected to the contact 30d by the contact 30c in the changeover switch 30 and the contact 30b is connected to the contact 30g by the contact 30f, no direct current is supplied to the contact 10b. Therefore, the upstream amplification stage 24 does not operate.

  That is, regardless of whether the changeover switch 30 is switched to a state in which a direct current is supplied to the contact 10b of the changeover switch 10 or a state in which the direct current is not supplied, the contacts 10a and 10e are connected by operating the contacts 10c, 10f of the changeover switch 10. When the contact 10b and the contact 10h are connected, a UHF band digital television broadcast signal is supplied to the contact 10b, amplified to the downstream amplification stage 18 via the DC blocking capacitor 16, and supplied to the output terminal 22. It is possible to switch to a state where no DC current is supplied to the upstream amplification stage 24 and no upstream CATV signal is supplied to the input terminal 2. In this way, only by operating the changeover switch 10, the digital television broadcast signal in the UHF band can be amplified and switched to a state where no direct current is supplied to the upstream amplification stage 24.

  The booster of 2nd Embodiment is shown in FIG. In the booster of the first embodiment, the two changeover switches 10 and 30 are used. However, the booster of this embodiment uses only one changeover switch 40 and is similar to the booster of the first embodiment. Any of a state in which the downstream CATV signal is amplified and the upstream CATV signal is amplified, only the UHF band digital television broadcast signal is amplified, and only the UHF band and VHF band television broadcast signals are amplified. In addition, it can be switched.

  The changeover switch 40 can be switched to one of three states, and has a contact 40a serving as a third terminal and a contact 40b serving as a fourth terminal. The contact 40a is connected to any one of the contacts 40c, 40d, and 40e, and the contact 40b is connected to any one of the contacts 40f, 40g, and 40h. However, when the contact 40a is connected to the contact 40c, the contact 40b is connected to the contact 40f. When the contact 40a is connected to the contact 40d, the contact 40b is connected to the contact 40g. When 40a is connected to the contact 40e, the contact 40b is interlocked to connect to the contact 40h.

  A series circuit of first DC blocking means, for example, DC blocking capacitors 12a and 12b, and first filter means, for example, bandpass filter 14, is connected between the contacts 40c and 40f. The contacts 40d and 40g are connected to each other. Between the contacts 40e and 40h, second DC blocking means, for example, DC blocking capacitors 42a and 42b, and second filter means, for example, a fourth frequency band, specifically, VHF band and UHF band television broadcasting. A series circuit is connected to a high pass filter 44 in which a pass band is set so as to pass only the signal. The DC blocking capacitor 42 a is connected to the input side of the high pass filter 44, and the DC blocking capacitor 42 b is connected to the output side of the high pass filter 44. In addition, since the other structure is the same as the booster of 1st Embodiment, the same code | symbol is attached | subjected to the same part and the description is abbreviate | omitted.

  In this booster, in the first state in which the contact 40a is connected to the contact 40d and the contact 40b is in contact with the contact 40g, the downstream CATV signal is transmitted from the downstream amplification stage 18 as in the booster of the first embodiment. It is amplified and supplied to the output terminal 22, and the upstream CATV signal is amplified by the upstream amplification stage 24 and supplied to the input terminal 2.

  In the second state in which the contact 40a is connected to the contact 40c and the contact 40b is connected to the contact 40f, only the digital television broadcast signal in the UHF band is the downstream amplification stage as in the booster of the first embodiment. The DC current amplified by 18 and supplied to the output terminal 22 and supplied from the DC power source to the contact 40b is blocked by the DC blocking capacitors 12a and 12b and not supplied to the power supply terminal of the upstream amplification stage 24. The amplification stage 24 does not operate.

  In the third state in which the contact 40a is connected to the contact 40e and the contact 40b is connected to the contact 40h, the VHF band and UHF band television broadcast signals from the input terminal 2 are transmitted to the demultiplexing mixer 4, the band The high-pass filter 44 is supplied via the pass filter 6, the DC blocking capacitor 8, the contact 40a of the changeover switch 40, and the DC blocking capacitor 42a. Here, television broadcast signals in the VHF band and the UHF band are extracted and supplied to the downstream amplification stage 18 via the DC blocking capacitor 42b, the contact 40h, the contact 40b, and the DC blocking capacitor 16, and are amplified there. It is supplied to the output terminal 22 via the demultiplexer / mixer 20. On the other hand, the DC current supplied from the DC power source to the contact 40b is blocked by the DC blocking capacitors 42a and 42b, and is not supplied to the power supply terminal of the upstream amplification stage 24, and the upstream amplification stage 24 does not operate.

  As described above, the booster according to the second embodiment can be used as a CATV bidirectional booster or a CATV unidirectional booster, and is further used as a terrestrial digital broadcast booster by connecting the bandpass filter 14 with the changeover switch 40. be able to.

  If the DC blocking capacitors 42a and 42b and the high-pass filter 44 are removed and the contacts 40e and 40h are connected by a DC blocking capacitor, the contact 40a is connected to the contact 40e, and the contact 40b is connected to the contact 40h. As in the first embodiment, the downstream CATV signal is amplified by the downstream amplification stage 18 and supplied to the output terminal 22, but no DC current is supplied to the power supply terminal of the upstream amplification stage 24, and the upstream amplification stage 24. May not operate, and the upstream CATV signal may not be supplied to the input terminal 2.

  Alternatively, in the second embodiment, if the changeover switch 30 is provided as in the first embodiment, the contact 40a is connected to the contact 40d and the contact 40b is connected to the contact 40g in the changeover switch 40. In this state, if the contacts 30c and 30f of the changeover switch 30 are operated to connect the contact 30a and the contact 30d, and the contact 30b and the contact 30g are connected, the downstream CATV signal is amplified and applied to the output terminal 22. However, a DC current is not supplied to the power supply terminal of the upstream amplification stage 24, the upstream amplification stage 24 does not operate, and the upstream CATV signal is not supplied to the input terminal 2.

  In the first embodiment, the selector switch 30 is removed to amplify the downstream CATV signal, amplify the upstream CATV signal, and a UHF band digital television broadcast signal. It is also possible to switch to only two stages, in which no direct current is supplied to the upstream amplifier stage 24 and the upstream amplification stage 24 does not operate.

  In the first and second embodiments, two DC blocking capacitors 12a and 12b are connected in series with the bandpass filter 14, and in the second embodiment, two DC blocking capacitors 42a, Although 42b is connected, only one of the DC blocking capacitors 12a and 12b may be provided, and only one of the DC blocking capacitors 42a and 42b may be provided.

  Although the changeover switch 30 is provided in the first embodiment, an open / close switch may be provided instead. In the first and second embodiments, the band-pass filter 6 is used, but a high-pass filter that allows a downstream CATV signal to pass can be used instead. In the first and second embodiments, the band-pass filter 14 is used, but instead, for example, a high-pass filter that passes a digital television broadcast signal in the UHF band may be used. Similarly, although the high-pass filter 44 is used in the second embodiment, a band-pass filter through which television broadcast signals in the VHF band and the UHF band pass can be used instead.

  In the first and second embodiments, only the terrestrial digital broadcast signal is amplified in the UHF band. However, the terrestrial digital broadcast signal and the terrestrial analog broadcast signal may be amplified.

2 Input terminal (first terminal)
10 Changeover switch (switching means)
10a Contact (third terminal)
10b Contact (fourth terminal)
12a 12b DC blocking capacitor (DC blocking means)
14 Band pass filter (filter means)
18 Downward amplification stage (first amplification means)
22 Output terminal (second terminal)
24 Up amplification stage (second amplification means)

Claims (4)

A first terminal to which a high-frequency signal in a first frequency band or a high-frequency signal in a second frequency band is supplied;
A second terminal to which a high-frequency signal in a third frequency band may be supplied;
An input is connected to the first terminal side, an output is connected to the second terminal side, and the high frequency signal of the first frequency band or the high frequency signal of the second frequency band supplied from the first terminal is amplified. First amplifying means for supplying to the second terminal;
It operates when an operating current is supplied to the power supply terminal, an input is connected to the second terminal side, an output is connected to the first terminal side, and a high-frequency signal in the third frequency band is supplied to the second terminal A second amplifying means for amplifying it and supplying it to the first terminal,
A series circuit of filter means for passing a high-frequency signal in the second frequency band and DC blocking means;
A third terminal connected to the first terminal and the power supply terminal of the second amplifying means; and a fourth terminal connected to the input of the first amplifying means. Is connected to the DC power supply terminal and the third and fourth terminals are selected from the first and second states, and the third and fourth terminals are connected in the first state. Switching means in which the series circuit is connected between the third and fourth terminals in the second state,
It has a booster.   The booster according to claim 1, wherein an opening / closing means is provided between the DC power supply terminal and the fourth terminal. A first terminal to which a high-frequency signal in a first frequency band or a high-frequency signal in a second frequency band is supplied;
A second terminal to which a high-frequency signal in a third frequency band may be supplied;
An input is connected to the first terminal side, an output is connected to the second terminal side, and the high frequency signal of the first frequency band or the high frequency signal of the second frequency band supplied from the first terminal is amplified. First amplifying means for supplying to the second terminal;
It operates when an operating current is supplied to the power supply terminal, an input is connected to the second terminal side, an output is connected to the first terminal side, and a high-frequency signal in the third frequency band is supplied to the second terminal A second amplifying means for amplifying it and supplying it to the first terminal,
A series circuit of first filter means for passing a high-frequency signal in the second frequency band, and first DC blocking means;
A third terminal connected to the first terminal and the power supply terminal of the second amplifying means; and a fourth terminal connected to the input of the first amplifying means. Is connected to the DC power supply terminal, and the third and fourth terminals are selected from the first to third states, and the third and fourth terminals are connected in the first state. In the second state, the first series circuit is connected between the third and fourth terminals, and in the third state, the second DC blocking means is connected between the third and fourth terminals. Means,
It has a booster. 4. The booster according to claim 3, wherein a high-frequency signal in a fourth frequency band is also supplied to the first terminal, and a second high-frequency signal in the fourth frequency band is passed in series with the second DC blocking means. Booster provided with filter means.

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