JP2906864B2 - Common amplifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a common amplifying device, and more particularly to a common amplifying device which distributes one input signal to a plurality of linear amplifiers, amplifies the signals, and combines the outputs of the respective linear amplifiers into output signals.

[0002]

2. Description of the Related Art In general, it is very difficult to obtain a large output by linearly amplifying a signal without distortion, and in consideration of redundancy at the time of failure of an amplifier, etc. A common amplifying device is used which distributes and amplifies the output to the linear amplifiers, combines the outputs of the respective linear amplifiers, and uses them as output signals.

FIG. 2 is a block diagram showing an example of a conventional common amplifying device, and shows a common amplifying device using n (n is an integer of 2 or more) linear amplifiers 51 to 5n.

[0004] Here, the signal distributor 3 distributes the input signal Si to n and supplies it to the linear amplifiers 51 to 5n, respectively.
Each of the linear amplifiers 51 to 5n linearly amplifies the distributed signal and outputs the signal to the signal combiner 4. Signal synthesizer 4
Synthesizes the outputs of the linear amplifiers 51 to 5n and sends them out as an output signal So. The number of mounted linear amplifiers is set in advance according to the output power to design the signal distributor and the signal combiner.

[0005]

As described above, in the conventional common amplifying device, a signal distributor and a signal combiner are designed in accordance with the number of mounted linear amplifiers. That is, a plurality of linear amplifiers are operated in a constantly connected state. For this reason, when the number of mounted linear amplifiers is changed, it is necessary to change and adjust the signal distributors and the signal combiners to match the number of mounted lines after the change. Since it must be stopped, there is a problem that the operation service is stopped.

An object of the present invention is to provide a common amplifying device that can change the number of mounted linear amplifiers without stopping the device.

[0007]

SUMMARY OF THE INVENTION A common amplifying device according to the present invention receives a signal from a plurality of output terminals of a signal distributor for distributing one input signal to a plurality of output terminals. A plurality of linear amplifiers for performing linear amplification, a signal combiner having the same number of input terminals as a plurality of output terminals of the signal distributor, and combining signals from the plurality of linear amplifiers, and a plurality of outputs of the signal distributor. A first switch group provided at each end for on / off operation, a second switch group provided at a plurality of input terminals of the signal combiner for on / off operation, and whether the plurality of linear amplifiers are mounted. And mounting control means for detecting the presence or absence of each of the first and second switch groups. The mounting detecting means, when a linear amplifier is mounted, comprises the first and second switch groups. of The switches corresponding to the mounted linear amplifiers are turned on. If the linear amplifiers are not mounted, the switches corresponding to the non-mounted linear amplifiers of the first and second switch groups are respectively set. This is a configuration in which control is performed so as to be turned off.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which n (n is an integer of 2 or more) linear amplifiers 41-41.
4n shows a common amplifying device in which 4n can be mounted. FIG. 3 shows a state where the linear amplifier 42 is not mounted.

Each of the linear amplifiers 41 to 4n has a signal input terminal a, a signal output terminal b, and a mounting detection terminal c, and when the linear amplifier is mounted, the mounting detection terminal c. To give the ground.

Each of the mounting detectors 31 to 3n includes a corresponding one of the linear amplifiers 4.
1 to 4n, and detects whether or not the linear amplifier is mounted according to the state of the mounting detection terminal c, that is, whether or not the mounting detection terminal c is ground. Switches 11 to 1n and 21 to 2n, respectively.

The signal distributor 1 is a distributor capable of distributing an input signal Si to n, and switches 11 to 1n are connected to respective output terminals. Similarly, the signal combiner 2 is a combiner that can combine outputs of n linear amplifiers, and switches 21 to 2n are connected to input terminals.

The signal distributor 1 and the signal combiner 2
For example, it is composed of a Wilkinson type synthesis circuit. In this circuit, a plurality of output or input terminals are connected to one load resistance by quarter-wavelength distribution lines each having a characteristic impedance of 50Ω, and linear amplifiers connected to a plurality of output or input terminals are mutually connected. A balance resistor is provided so as not to interfere, and has a function of equally dividing or combining power.

When the mounting detectors 31 to 3n detect that the linear amplifier is mounted, they turn on the corresponding switches to connect the linear amplifier to the signal distributor 1 and the signal combiner 2. . When it is detected that the linear amplifier is not mounted, the corresponding switch is turned off, and the corresponding output terminal of the signal distributor 1 and the corresponding input terminal of the signal combiner 2 are opened. For example, as shown in FIG. 1, when the linear amplifier 42 is not mounted, the switches 12 and 22 are turned off.

As described above, for example, when n-1 linear amplifiers are mounted, the signal distributor 1 outputs the input signal Si to n-1 since one of the n output terminals is open.
Distribute. The signal synthesizer 2 has one of the n input terminals.
Are in an open state, the outputs of the n-1 linear amplifiers are combined and sent out as an output signal So. Therefore, the number of mounted linear amplifiers can be changed without stopping the apparatus.

[0016]

As described above, according to the present invention, mounted detectors for detecting whether a plurality of linear amplifiers are mounted are provided, and each output terminal of the signal distributor and the signal combiner are provided. If a linear amplifier is mounted, switch on the corresponding output terminal of the signal distributor and the corresponding input terminal of the signal combiner to connect the linear amplifier. ,Also,
If a linear amplifier is not installed, the corresponding output terminal of the signal distributor and the corresponding input terminal of the signal combiner are controlled to be turned off, so that the number of linear amplifiers installed is automatically adjusted. , The number of mounted linear amplifiers can be changed without stopping the apparatus.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a conventional common amplifying device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal distributor 2 Signal synthesizer 11-1n, 21-2n Switch 31-3n Mounting detector 41-4n Linear amplifier Si Input signal So Output signal

Claims (1)

(57) [Claims] 1. A signal distributor that distributes one input signal to a plurality of output terminals, a plurality of linear amplifiers that respectively receive signals from a plurality of output terminals of the signal distributor and linearly amplify the signals, and the signal distribution device. A signal combiner having the same number of input terminals as the plurality of output terminals of the device and combining signals from the plurality of linear amplifiers; and a first signal combiner provided at each of the plurality of output terminals of the signal distributor for on / off operation. A switch group, a second switch group provided at each of a plurality of input terminals of the signal combiner and performing on / off operations, and detecting whether or not the plurality of linear amplifiers are mounted. Mounting means for controlling the second group of switches; the mounting detecting means, when a linear amplifier is mounted, the switch corresponding to the linear amplifier mounted in the first and second switch groups. Switches are turned on, and when no linear amplifier is mounted, the switches corresponding to the non-mounted linear amplifiers of the first and second switch groups are controlled to be turned off. A common amplifying device, characterized in that: