JP2007006195A - Communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power consumption in a communication device having a transmitter of a current system and a transmitter of a standby system. <P>SOLUTION: A transmitter 1 of the current system includes a current system amplifier 18a for amplifying a signal being a transmission object and current system monitor means 25a and 11a for monitoring a state on the basis of a feedback signal of the amplified signal. A transmitter 2 of the standby system includes a standby system amplifier 18b for amplifying a signal being a transmission object and standby system monitor means 25b and 11b for monitoring a state on the basis of a feedback signal of the amplified signal. The communication device includes switching means 5 and 3 for switching an operating transmitter between the transmitter of the current system and the transmitter of the standby system and level control means 5, 11b, and 31 for controlling an output level from the standby system amplifier so that the output level is lowered in such a degree that monitor is possible, when the transmitter of the standby system is in a non-operating state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication apparatus having an active transmitter and a standby transmitter, and more particularly to a communication apparatus that achieves low power consumption.

For example, in a system in which digital communication is not allowed to be interrupted, a dual system configuration including a working and standby radio is employed so that communication does not stop even if the radio fails. is doing.
FIG. 4 shows a configuration example of a part of such a dual system configuration as a configuration example of a communication apparatus adopting a dual system configuration of a transmitter.
In FIG. 4, for convenience of explanation, the same reference numerals are used to denote processing units that are generally the same as those of the communication apparatus shown in FIG. 1 according to an embodiment of the present invention described later. There is no intention to limit this. The communication apparatus shown in FIG. 4 differs from the communication apparatus shown in FIG. 1 mainly in the function of the baseband unit 62 and the configuration of the standby transmitter 61 including the baseband unit 62.

  When the active transmitter 1 is operated for wireless communication, the standby transmitter 61 is on standby. At this time, the standby transmitter 61 is in order to cope with irregular switching between active and standby. It is necessary to make sure that normal operation is always performed. For this reason, the standby transmitter 61 always performs transmission even during standby (so as not to be connected to the antenna 4), and constantly monitors the level by the power detector 25b. As described above, since the standby transmitter 61 needs to constantly check the amplification operation of the transmission path, it is necessary to turn on the power supply to the power amplifier 18b even during standby.

  As an example of the prior art, in a train radio telephone radio base station apparatus that has an operation channel and a maintenance channel and is duplexed using two systems of radio apparatuses, the standby state is maintained without stopping the operation. A wireless base station control device capable of exchanging wireless devices and confirming operation has been studied (see, for example, Patent Document 1).

JP 11-341547 A

As described above, in the communication apparatus as shown in FIG. 4, the power of the standby transmitter 61 is always used to check the operation of the standby transmitter 61 even when it is operated by the active transmitter 1. Since it is necessary to always turn on the desired power supply to the amplifier 18b, there is a problem that power consumption about twice that consumed by the active transmitter 1 is consumed.
The present invention has been made to solve such a conventional problem, and provides a communication apparatus that achieves low power consumption in a configuration having an active transmitter and a standby transmitter. With the goal.

In order to achieve the above object, the communication apparatus according to the present invention performs the following processing in a configuration having an active transmitter and a standby transmitter.
That is, in the active transmitter, the amplifier (active amplifier) amplifies the signal to be transmitted, and the monitoring means (active monitoring means) is based on the signal fed back the signal amplified by the active amplifier. Monitor the status.
In the standby transmitter, the amplifier (backup amplifier) amplifies the signal to be transmitted, and the monitoring means (backup system monitoring means) is in a state based on the signal fed back the signal amplified by the backup amplifier. To monitor.
In the communication apparatus, the active transmitter and the standby transmitter are switched as the transmitter operated by the switching unit, and the level control unit switches the standby transmitter to a non-operating state (that is, not operated). In this state, control is performed so that the output level from the standby system amplifier is reduced to the extent that monitoring by the standby system monitoring means is possible.
Therefore, when the standby transmitter is not operated, the output level from the standby amplifier is controlled to be small, so that the power consumption can be reduced. Further, since such level control is performed to such an extent that monitoring by the standby system monitoring means is possible, it is possible to realize low power consumption by level control while enabling monitoring.

Here, as the active transmitter and the standby transmitter, for example, the same configuration may be used, or different configurations may be used.
In addition to a configuration in which one standby transmitter is provided for one active transmitter, for example, a configuration in which a plurality of standby transmitters are provided for one active transmitter. Alternatively, a configuration in which one standby transmitter is provided for a plurality of active transmitters may be used. Even in these configurations, for example, for an operating transmitter, the output level of the amplifier is set to a level necessary for operation, and for an inactive transmitter, the output level of the amplifier is reduced to reduce power consumption. It is possible.

Various signals may be used as signals to be transmitted.
It should be noted that the signal to be transmitted is actually transmitted after being amplified in an operating transmitter, and the signal to be transmitted is not actually transmitted in an unoperated transmitter, for example, warm-up or device Used for status monitoring.
Various modes may be used for monitoring the state based on a signal obtained by feeding back the amplified signal. For example, it is monitored whether the level of the amplified signal satisfies a predetermined condition. And a mode of monitoring whether the waveform or distortion of the amplified signal satisfies a predetermined condition can be used.

Various monitoring states may be used, for example, monitoring whether the amplifier or other processing unit is functioning normally in the transmitter in operation, It is possible to monitor the status of whether or not the amplifier or other processing unit can function normally (if it is operated) in the transmitter in operation.
As an example, in a transmitter, when the level of the signal fed back is the same or approximated to the level when the amplifier is assumed to function normally, the amplifier functions normally. In other cases, it can be determined that a failure has occurred. As another example, in the transmitter, when the level of the fed back signal is equal to or higher than a predetermined threshold value or exceeds the predetermined threshold value, it is determined that the amplifier or the like is functioning normally. It can be determined that it has occurred.

In addition, as an aspect of switching the active transmitter and the standby transmitter as the operating transmitter, for example, when the active transmitter is in operation and the standby transmitter is not in operation When a failure occurs in the active transmitter, a mode is used in which the active transmitter is switched to the non-operating state and the standby transmitter is switched to the operating state.
Various modes may be used for controlling the output level from the standby system amplifier so that the output level from the standby system amplifier is reduced to the extent that monitoring by the standby system monitoring means is possible. For example, monitoring is possible. A mode in which the output level from the standby system amplifier is reduced as much as possible, or a mode in which the output level from the backup system amplifier is made slightly larger than the limit value with a margin more than such a limit value, etc. Can be used.
Various signal levels such as a power level may be used.

Various modes may be used for controlling the output level from the standby system amplifier. For example, the output level from the standby system amplifier is controlled by controlling the voltage level applied to the bias of the standby system amplifier. A mode of controlling the output level, a mode of controlling the output level from the standby system amplifier by controlling the level change amount of the level change means provided in the previous stage of the backup system amplifier, a combination thereof, or the like can be used.
As the level changing means, for example, a variable attenuator that reduces the signal level with a variable attenuation amount, a variable amplifier that increases the signal level with a variable gain, or the like can be used.
Further, the switching means and the level control means may be provided at any location, for example, may be provided outside the transmitter, or may be provided inside the transmitter.

The communication apparatus according to the present invention performs the following processing.
That is, the working system monitoring means detects the occurrence of a failure in the working system transmitter when the working system transmitter is in operation.
The switch means switches the active transmitter from the active transmitter to the spare in response to the occurrence of a failure detected by the active monitor means when the active transmitter is in operation. Switch to the system transmitter.
The level control means is configured such that when the occurrence of a failure is detected by the active system monitoring means when the active transmitter is in operation, the output level from the standby amplifier is a predetermined level during operation. Control to level.
Therefore, when the standby transmitter is not operating, the power consumption can be reduced by reducing the output level from the standby amplifier, and the standby transmitter can be switched to operating. In some cases, appropriate switching can be performed by controlling the output level from the standby amplifier to be a sufficient level during operation.

Here, various levels may be used as the predetermined level at the time of operation related to the output level from the standby amplifier. For example, the signal amplified by the standby amplifier provided in the standby transmitter is actually used. It is only necessary to secure a level necessary for transmission to the network. As an example, as the predetermined level during operation related to the output level from the standby amplifier, the same value as the predetermined level during operation related to the output level from the working amplifier can be used.
In the standby transmitter, the output level from the standby amplifier is relatively low during non-operation, and the output level from the standby amplifier is relatively high during operation.
The output level from the standby amplifier is not necessarily switched between the non-operating level and the operating level. For example, when switching from the non-operating state to the operating state, A mode in which the output level is gradually increased can also be used.

  As described above, according to the communication apparatus according to the present invention, in the configuration having the active transmitter and the standby transmitter, the active transmitter is in operation and the standby transmitter is not operating. When in operation, the output level from the standby system amplifier is controlled to be small enough to be monitored, while when the active system transmitter fails and the standby system transmitter is operated, the standby system amplifier Since the output level from the receiver is increased to the level required for operation, the standby transmitter is monitored and the power consumption is reduced in the standby transmitter that is not in operation. Can do.

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

A first embodiment of the present invention will be described.
FIG. 1 shows a configuration example of the dual system configuration of the transmitter as a configuration example of the communication apparatus of this example. Note that the communication device of this example is a wireless communication device, and the transmitter of this example is a digital transmitter.
The communication apparatus of this example includes an active transmitter (active transmitter) 1, a standby transmitter (protective transmitter) 2, an active / backup switch 3, an antenna 4, and a control unit ( CONT) 5.
The active transmitter 1 and the standby transmitter 2 are each provided with the same processing unit except for the components related to the D / A (Digital to Analog) converter 31. Specifically, the base transmitter (BB) ) Units 11a and 11b, bandpass filters 12a and 12b, reference signal generators 13a and 13b, frequency synthesizers (SYN) 14a and 14b, mixers 15a and 15b, bandpass filters 16a and 16b, and attenuators (ATT) 17a, 17b, power amplifiers 18a, 18b, directional couplers 19a, 19b, isolators 20a, 20b, low-pass filters 21a, 21b, attenuators 22a, 22b, mixers 23a, 23b, Band pass filters 24a and 24b and power detectors (DET) 25a and 25b are provided.
The standby transmitter 2 further includes a D / A converter 31.

An example of the operation in the communication apparatus of this example is shown.
First, an example of the operation performed in the working transmitter 1 is shown.
An unnecessary signal component is removed from the modulated signal generated by the baseband unit 11a by the bandpass filter 12a, and the modulated signal is input to the mixer 15a.
The reference signal generated by the reference signal generator 13a is input to the frequency synthesizer 14a. The frequency synthesizer 14a generates a local signal (LO signal) based on the input reference signal. One LO signal is input to the mixer 15a, and the other LO signal is input to the mixer 23a.

The modulation signal input to the mixer 15a is frequency-converted to a transmission frequency (RF frequency) by the LO signal given by the frequency synthesizer 14a. An unnecessary signal component is removed from the frequency-converted signal by the band-pass filter 16a, the level is adjusted by the attenuator 17a, and the signal is input to the power amplifier 18a. The signal input to the power amplifier 18a is amplified to a desired power and input to the low pass filter 21a via the directional coupler 19a and the isolator 20a. The low-pass filter 21a removes harmonic components generated by the power amplifier 18a from the input signal.
An output signal from the low-pass filter 21a is input to the antenna 4 via the active / preliminary changeover switch 3 and transmitted from the antenna 4 by radio. When the active transmitter 1 is operated for wireless communication, the control unit 5 switches the active / backup switch 3 to connect the low-pass filter 21a of the active transmitter 1 and the antenna 4.

In the directional coupler 19a, a part of a signal (transmission signal) transmitted from the power amplifier 18a to the isolator 20a is extracted as a feedback signal, one feedback signal is input to the attenuator 22a, and the other feedback signal is power. Input to the detector 25a.
The signal input to the attenuator 22a is adjusted in power level and input to the mixer 23a. In the mixer 23a, the signal input from the attenuator 22a is frequency-converted to the baseband by the LO signal output from the frequency synthesizer 14a. The frequency-converted signal is input to the baseband unit 11a after unnecessary signals are removed by the bandpass filter 24a. The baseband unit 11a automatically adjusts the transmission output power based on this feedback signal.

For the signal branched by the directional coupler 19a and input to the power detector 25a, the transmission level is detected and the presence / absence of a failure is transmitted to the baseband unit 11a.
For example, when a threshold value or a range that defines a transmission level in a state where there is no failure (normal state) is set and the transmission level detected by the power detector 25a is equal to or higher than the threshold value or exceeds the threshold value, or When the transmission level detected by the power detector 25a falls within the range, it is regarded as a normal state, while in other cases, a failure is detected by assuming that a failure has occurred. Can do. As another example, a condition relating to a waveform of a transmission signal in a state where there is no failure (normal state) is defined, and it is determined whether or not the condition is satisfied for the feedback transmission signal, and the condition is satisfied. In some cases, it may be regarded as a normal state, while in other cases, a failure may be detected by assuming that a failure has occurred.

Further, in the communication apparatus of this example, there is a standby transmitter 2 having a similar transmission function in order to prevent transmission stop due to a failure of the active transmitter 1. The operations of the baseband unit 11b to the bandpass filter 24b in the standby transmitter 2 are the same as those of the active transmitter 1 except for the portion related to the control of the power amplifier 18b, and the description of the same portions is omitted. To do.
In a normal state, the low-pass filter 21 a of the working transmitter 1 and the antenna 4 are connected by the working / backup switch 3. Then, when the control unit 5 monitors the baseband unit 5 of the working transmitter 1 and detects that the working transmitter 1 has failed, the control unit 5 controls the working / standby changeover switch 3 to The active / backup switch 3 is switched so that the low-pass filter 21b of the transmitter 2 and the antenna 4 are connected. As a result, even if the active transmitter 1 fails, the standby transmitter 2 can be used to operate without stopping transmission.

In this example, the control unit 5 controls the power consumption in the power amplifier 18 b of the standby transmitter 2 by controlling the baseband unit 11 b of the standby transmitter 2.
When the active transmitter 1 is in operation, the standby transmitter 2 is in hot-swap standby (hot standby) and constantly monitors its operation by the power detector 25b. In the standby transmitter 2 of this example, the standby power amplifier 18b is operated to a minimum bias point at which the amplification operation can be confirmed (that is, the current is suppressed).

Specifically, the operation class of the power amplifier 18b is normally set to class A or class AB in order to suppress adjacent channel leakage power or spurious to a specified value or less by the radio wave method. However, since the transmission signal in the standby transmitter 2 is not transmitted from the antenna 4 when the standby transmitter 2 is on standby, the power amplifier 18b is operated in the class B or C class during standby and is amplified. Only monitor activity. The bias control of the power amplifier 18b is performed via the D / A converter 31 by the baseband unit 11b.
Then, at the same time as switching from the operation of the active transmitter 1 to the operation of the standby transmitter 2, the control transmitter 5 controls the standby transmitter 2 via the D / A converter 34 by the baseband unit 11b. Thus, the bias value of the power amplifier 18b is switched to the bias point in the normal transmission state. As a result, the power consumption of the standby transmitter 2 during the operation of the active transmitter 1 can be suppressed.

As described above, the communication apparatus of this example has a function of controlling the bias of the power amplifier 18b of the standby transmitter 2 in the configuration including the active and standby dual transmitters 1 and 2. In addition, by reducing the bias point of the power amplifier 18b of the standby transmitter 2 that is in standby to the minimum bias point that can be confirmed for operation, the current consumption is reduced and the efficiency of the radio is increased. be able to.
In the communication apparatus of this example, in the configuration in which the failure is detected in the active transmitter 1 or the standby transmitter 2 by detecting the failure by feeding back the transmission signal and comparing it with the correct level or the correct signal. By controlling the bias of the power amplifier 18b of the standby transmitter 2, the power consumption can be reduced while checking the operation of the standby transmitter 2.

Here, the communication device of this example may be applied to various devices, and can be applied to, for example, a base station device of a radio system for disaster prevention administration in which it is not allowed to interrupt a signal.
Further, in this example, the case where the configurations of the active transmitter 1 and the standby transmitter 2 are different is shown. For example, the configuration of the standby transmitter 2 is the same as that of the active transmitter 1 of this example. As another example, the control unit 5 may be provided with different parts (in this example, the D / A converter 31 and a function of appropriately biasing control through the D / A converter 31), or the active transmitter. 1 may be configured in the same manner as the standby transmitter 2 of this example (a configuration in which the D / A converter 31 is included for bias control).

In the working transmitter 1 of this example, a working amplifier is constituted by the power amplifier 18a, and a working monitoring means is constituted by the function of the power detector 25a and the function of the baseband unit 11a.
Further, in the standby transmitter 2 of this example, a standby amplifier is configured by the power amplifier 18b, and the standby monitoring means is configured by the function of the power detector 25b and the function of the baseband unit 11b.
Further, in the communication apparatus of this example, the switching means is configured by the function of the control unit 5 and the function of the working / standby changeover switch 3, and the function of the control unit 5, the function of the baseband unit 11b, and the D / A converter Level control means is constituted by 31 functions.

A second embodiment of the present invention will be described.
FIG. 2 shows a configuration example of the dual system configuration of the transmitter as a configuration example of the communication apparatus of this example.
2, for convenience of explanation, the same components as those of the communication apparatus shown in FIG. 1 are denoted by the same reference numerals, and in this example, a configuration different from that of the communication apparatus shown in FIG. The part will be described in detail.
In the communication apparatus of this example, the configuration of the standby transmitter 2a is different from that of the communication apparatus shown in FIG. Specifically, the standby transmitter 2a of this example does not have a function related to bias control such as the D / A converter 31 as shown in FIG. 1, and the band-pass filter 16b and the power amplifier 18b A variable attenuator 41 is provided as an attenuator between them, a D / A converter 42 for controlling the variable attenuator 41 is provided, and a baseband unit 43 having a function of performing the control is provided. It has been.

An example of the operation in the communication apparatus of this example is shown.
The transmission operation in the active transmitter 1 and the standby transmitter 2a and the switching operation between the active system and the standby system by the active / backup switch 3 are the same as those described for the communication apparatus shown in FIG. .
In the standby transmitter 2a of this example, the baseband unit 43 controls the amount of attenuation of the variable attenuator 41 via the D / A converter 42 during standby, so that the variable attenuator 41 causes the power amplifier 18b. Reduce the input power of the signal to (squeeze). As a result, the output power of the power amplifier 18b is reduced, and current consumption can be suppressed. Further, at the same time when the active transmitter 1 breaks down and switches to the operation of the standby transmitter 2a, the baseband unit 43 is connected to the D / A so that the output power from the power amplifier 18b becomes a desired transmission output level. The amount of attenuation of the variable attenuator 41 is controlled via the converter 42. The baseband unit 43 is controlled by the control unit 5.

As described above, in the communication apparatus of this example, the function of controlling the input level to the power amplifier 18b of the standby transmitter 2a in the configuration including the active and standby duplex transmitters 1 and 2a. The current consumption is reduced by increasing the attenuation amount of the variable attenuator 41 connected to the power amplifier 18b of the standby transmitter 2a in standby mode to, for example, the maximum attenuation amount that can be checked for operation. Thus, high efficiency of the radio can be realized.
In the communication apparatus of this example, in the configuration in which the failure is detected in the active transmitter 1 or the standby transmitter 2a by detecting the failure by feeding back the transmission signal and comparing it with the correct level or the correct signal. By narrowing the input level to the power amplifier 18b of the standby transmitter 2a to the extent that detection of the standby transmitter 2a is possible, it is possible to reduce power consumption while checking the operation of the standby transmitter 2a.

Further, in this example, the case where the configurations of the active transmitter 1 and the standby transmitter 2a are different from each other has been shown. However, for example, these configurations can be the same, and the communication apparatus as a whole is shown in FIG. It is possible to realize the same configuration and operation as the example.
In the communication apparatus of this example, the level control means is configured by the function of the control unit 5, the function of the baseband unit 43, the function of the D / A converter 42, and the function of the variable attenuator 41.

A third embodiment of the present invention will be described.
FIG. 3 shows a configuration example of the dual system configuration of the transmitter as a configuration example of the communication apparatus of this example.
In FIG. 3, for convenience of explanation, the same components as those of the communication apparatus shown in FIG. 1 or FIG. 2 are denoted by the same reference numerals, and in this example, shown in FIG. 1 or FIG. Components different from the communication device will be described in detail.
In the communication apparatus of this example, the configuration of the standby transmitter 2b is different from that of the communication apparatus shown in FIG. 1 or FIG. Specifically, the standby transmitter 2b of this example includes a D / A converter 31 related to bias control similar to that shown in FIG. 1, and a variable attenuator similar to that shown in FIG. 41 and a D / A converter 42 for controlling the attenuation amount thereof, and a baseband unit having both a function of controlling the bias of the power amplifier 18b and a function of controlling the attenuation amount of the variable attenuator 41 51 is provided.

An example of the operation in the communication apparatus of this example is shown.
The transmission operation in the active transmitter 1 and the standby transmitter 2b and the switching operation between the active system and the standby system by the active / backup switch 3 are the same as described for the communication apparatus shown in FIG. .
In the standby transmitter 2b of this example, the baseband unit 51 controls the bias level of the power amplifier 18b via the D / A converter 31 and variable attenuation via the D / A converter 42 during standby. The output power from the power amplifier 18b is reduced by combining the control of the attenuation amount of the device 41. As a result, the current consumption in the power amplifier 18b can be suppressed. Further, at the same time when the active transmitter 1 breaks down and switches to the operation of the standby transmitter 2b, the baseband unit 51 is connected to the D / A so that the output power from the power amplifier 18b becomes a desired transmission output level. The bias level of the power amplifier 18 b is controlled via the converter 31 and the attenuation amount of the variable attenuator 41 is controlled via the D / A converter 42. The baseband unit 51 is controlled by the control unit 5. It should be noted that the degree of bias control of the power amplifier 18b and the degree of control of the input level to the power amplifier 18b may be combined in various manners, and it is only necessary to perform appropriate level control as a whole.

As described above, the communication apparatus of this example has a function and power for controlling the bias of the power amplifier 18b of the standby transmitter 2b in the configuration including the active and standby dual transmitters 1 and 2b. It has a function of controlling the input level to the amplifier 18b, and by controlling the output level from the power amplifier 18b of the standby transmitter 2b that is in standby, for example, to the minimum value that can confirm the operation, current consumption The efficiency of the radio can be improved.
In the communication apparatus of this example, such a failure is detected in the configuration in which the failure is detected in the active transmitter 1 or the standby transmitter 2b by feeding back the transmission signal and comparing it with the correct level or the correct signal. By reducing the output level from the power amplifier 18b of the standby transmitter 2b to the extent that it can be detected, it is possible to reduce power consumption while checking the operation of the standby transmitter 2b.

Further, in this example, the case where the configurations of the active transmitter 1 and the standby transmitter 2b are different is shown. However, for example, these configurations can be the same, and the communication apparatus as a whole is shown in FIG. It is possible to realize the same configuration and operation as the example.
In the communication apparatus of this example, the level control means is controlled by the function of the control unit 5, the function of the baseband unit 51, the function of the D / A converter 31, the function of the D / A converter 42, and the function of the variable attenuator 41. Is configured.

Here, the configurations of the communication apparatus, the transmitter, and the like according to the present invention are not necessarily limited to those described above, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various devices and systems.
The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.
In addition, as various processes performed in the communication device or the transmitter according to the present invention, for example, the processor executes a control program stored in a ROM (Read Only Memory) in a hardware resource including a processor, a memory, and the like. For example, each functional unit for executing the processing may be configured as an independent hardware circuit.
The present invention can also be understood as a computer-readable recording medium such as a floppy (registered trademark) disk or a CD (Compact Disc) -ROM storing the control program, and the program (itself). The processing according to the present invention can be performed by inputting the program from the recording medium to the computer and causing the processor to execute the program.

It is a figure which shows the structural example of the communication apparatus which concerns on 1st Example of this invention. It is a figure which shows the structural example of the communication apparatus which concerns on 2nd Example of this invention. It is a figure which shows the structural example of the communication apparatus which concerns on 3rd Example of this invention. It is a figure which shows the structural example of a communication apparatus.

Explanation of symbols

  1 .... active system transmitters, 2, 2a, 2b, 61 .... standby system transmitters, 3 .... active / backup switch, 4 .... antenna, 5 .... control unit, 11a, 11b, 43, 51, 62 ··· Baseband section, 12a, 12b, 16a, 16b, 24a, 24b · · Band pass filter, 13a, 13b · · Reference signal generator, 14a, 14b · · Frequency synthesizer, 15a, 15b, 23a, 23b · Mixer, 17a, 17b, 22a, 22b, attenuator, 18a, 18b, power amplifier, 19a, 19b, directional coupler, 20a, 20b, isolator, 21a, 21b, low pass filter, 25a, 25b ... Power detector 31, 42 ... D / A converter, 41 ... Variable attenuator,

Claims (2)

In a communication device having an active transmitter and a standby transmitter,
The active transmitter includes an active amplifier that amplifies a signal to be transmitted, and an active monitoring unit that monitors a state based on a signal obtained by feeding back the signal amplified by the active amplifier,
The standby transmitter includes a standby amplifier that amplifies a signal to be transmitted, and standby monitoring means that monitors a state based on a signal obtained by feeding back the signal amplified by the standby amplifier,
The communication apparatus includes a switching unit that switches between the active transmitter and the standby transmitter as an operating transmitter, and monitoring by the standby system monitoring unit when the standby transmitter is in a non-operating state. Level control means for controlling the output level from the standby system amplifier to be as small as possible.
A communication device. The communication device according to claim 1,
The active monitoring means has a function of detecting the occurrence of a failure in the active transmitter when the active transmitter is in operation;
The switch means switches the active transmitter from the active transmitter to the spare in response to the occurrence of a failure detected by the active monitor means when the active transmitter is in operation. Switch to the system transmitter,
The level control means is configured such that when the occurrence of a failure is detected by the active system monitoring means when the active transmitter is in operation, the output level from the standby amplifier is a predetermined level during operation. Control to level,
A communication device.

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