JPH06132835A - Amplification system - Google Patents

Abstract

PURPOSE:To prevent an output level from being fluctuated by any factor such as the frequency characteristic temperature change and obsolescence of a synthesizing circuit or an amplifier circuit in the case of amplifying plural carriers. CONSTITUTION:Switching circuits 8 and 9 are switched corresponding to the designation of a switching signal sent from a switching signal sending circuit 7. Thus, a reception circuit 6 individually receives all of the carriers passing through an amplifying circuit 4 and outputs an electric field level corresponding to each frequency. This individual electric field level passes through the switching circuit 8 to make feedback to transmission circuits 2a to 2n corresponding to respective frequencies.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplification system, especially
The present invention relates to an amplification method for amplifying a plurality of carrier waves with one amplification circuit.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing an example of a conventional amplification method. A transmission circuit 2a for inputting a channel designation signal from a channel designation circuit 1a and transmitting an output signal of a designated frequency, a channel designation circuit. Transmission circuit 2b for inputting a channel designation signal from 1b to transmit an output signal of a designated frequency, ..., Transmitting transmission circuit 2b for receiving a channel designation signal from a channel designating circuit 1m, and transmitting an output signal of a designated frequency A circuit 1m, a transmission circuit 2n which inputs a channel designation signal from the channel designation circuit 1n and transmits an output signal of a designated frequency, and n output signals from the transmission circuits 2a and 2n are combined and output. A combining circuit 3 for inputting the combined output signal, and an amplifying circuit 4 for amplifying and outputting the combined output signal;
A distribution circuit 5 which inputs the amplified output and outputs it in two distributions;
The receiver circuit 6 receives one output of the distribution circuit 5 and outputs the electric field level of the frequency designated by the channel designation signal from the channel designation circuit 1n.

In this conventional amplification system, the receiving circuit 6 inputs only the channel designating signal of the channel designating circuit 1n,
As a result, the electric field level of the designated frequency is output and fed back to the amplifier circuit 4.

[0004]

According to this conventional amplification method, only the output level of the frequency designated by the nth channel designating circuit is monitored by the receiving circuit and the gain is controlled by feeding back the gain control. Therefore, the output level is kept constant for the frequency designated by the n-th channel designating circuit,
For other frequencies, the output level fluctuates due to factors such as the frequency characteristics of the synthesis circuit and amplification circuit, temperature changes, and deterioration, which leads to the transmission of illegal radio waves and a reduction in the wireless zone due to a decrease in the output level. There was a big problem in the system that it caused a decrease in

[0005]

The amplification method of the present invention is based on N
(N is an integer of 1) number of channel designating circuits and m-th (m =
1 to N) th m-th transmission circuit that transmits a frequency according to the channel designation signal from the channel designation circuit, a synthesis circuit that synthesizes and outputs the output signals of the N transmission circuits, and the synthesis In an amplification system including an amplification circuit that amplifies a combined output signal of the circuit, a distribution circuit that divides the output of the amplification circuit into two, and one output of the distribution circuit as an input and the k-th (k = 1 to N) ) Th receiving circuit for receiving the frequency by the channel specifying signal and outputting the electric field level of the frequency by the kth channel specifying signal, and an output signal level of the kth transmitting circuit with the electric field level as an input. And control means for controlling.

The control means sends a switching signal sending circuit for sending a switching signal designating the kth channel, and the kth transmission circuit designated by the switching signal from the switching signal sending circuit. And a switching circuit that forms a feedback loop from the receiving circuit.

[0007]

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 amplification system of the present invention.

In FIG. 1, the same components as those in the conventional example are designated by the same reference numerals as those in FIG. That is, in this embodiment, the channel designating circuits 1a, 1b, to 1n, the transmitting circuits 2a, 2b,
.About.2n, a synthesizing circuit 3, an amplifying circuit 4, a distributing circuit 5 and a receiving circuit 6, a switching signal sending circuit 7 and switching circuits 8 and 9 are added.

Next, the operation of this embodiment will be described.
The transmission circuits 2a, 2b, to 2n receive the channel designation signals output from the channel designation circuits 1a, 1b, to 1n, respectively, and transmit the output signals of the designated frequencies f1, f2, to fn. The n output signals are combined by the combining circuit 3, input to the amplifier circuit 4, and amplified and output. The distribution circuit 5 divides the output signal of the amplification circuit 4 into two, and inputs one output signal to the reception circuit 6.

The switching signal transmission circuit 7 outputs a switching signal for switching the frequency to the switching circuits 8 and 9. For example, the switching circuit 9 selects one of the n channel designation signals having the frequency f1 designated by the switching signal and passes it. The receiving circuit 6 locks to the frequency f1 designated by the channel designation signal input via the switching circuit 9 among the signals distributed by the distribution circuit 5, and outputs the electric field level of the frequency f1. The switching circuit 8 switches to the frequency f1 by the designated channel of the switching signal from the switching signal transmission circuit 7 in order to transmit the electric field level information to the transmission circuit 2a. As a result, a feedback loop is formed for the used line frequency f1 to the transmission circuit 2a via the reception circuit 6 and the switching circuit 8, and the final output level is kept constant.

By designating the frequency by the switching signal sent from the switching signal sending circuit 7, it is possible to form a feedback loop for other frequencies f2 to fn as well.

[0012]

As described above, according to the present invention, the switching circuit can be switched by the designation of the switching signal sent from the switching signal sending circuit, and the receiving circuit can individually receive all carrier waves. Since it is possible to feed back to all the transmission circuits corresponding to the frequency of, there is an effect that the final output level is kept constant.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an amplification system of the present invention.

FIG. 2 is a block diagram showing an example of a conventional amplification method.

[Explanation of symbols]

 1a, 1b, ~ 1n Channel designating circuit 2a, 2b, ~ 2n Transmitting circuit 3 Combining circuit 4 Amplifying circuit 5 Distribution circuit 6 Receiving circuit 7 Switching signal sending circuit 8, 9 Switching circuit

Claims (2)

[Claims] 1. An Nth (integer of N ≧ 1) channel designating circuit and an mth (m = 1, ..., N) th m (m = 1, ...
In the amplification system including a th transmission circuit, a synthesis circuit that synthesizes and outputs the output signals of the N transmission circuits, and an amplification circuit that amplifies the synthesis output signal of the synthesis circuit, the output of the amplification circuit is A distribution circuit that divides into two, and one of the outputs of the distribution circuit as an input, and receives the frequency of the k-th (k = 1 to N) th channel designation signal, and receives the frequency of the k-th channel designation signal. An amplification system comprising: a receiving circuit that outputs an electric field level; and control means that receives the electric field level and controls the output signal level of the kth transmission circuit. 2. The control means sends a switching signal sending circuit for sending a switching signal designating the kth channel, and the kth transmission circuit designated by the switching signal from the switching signal sending circuit. 2. The amplification system according to claim 1, further comprising: a switching circuit that selects a signal from the receiving circuit to form a feedback loop from the receiving circuit.