JPS5952955A - Device for branching and coupling signal - Google Patents

Abstract

PURPOSE:To realize a device for branching and coupling signals which an make communications between other normal stations even when the power supply to a station is cut off, by installing an active circuit which outpus a received signal to a transmitting-receiving device. CONSTITUTION:A signal inputted through an input terminal R1 is sent to can active circuit 102 and passive circuit 103 through a coupling transformer 101. Moreover, a signal inputted through another input terminal R2 is also sent to another pair of active circuit 105 and passive circuit 106. In addition to the above, a signal inputted from an upward circuit and another signal outputted from a transmitting-receiving device and passed through an active circuit 109 are coupled with each other at the passive circuit 103 and sent to an output terminal S2. The same operation is performed to a downward circuit also. Since the input impedance of the active circuit 102 and 105 and output impedance of the active circuits 109 and 110 are high, a signal can be repeated without giving the circuits characteristic changes even when the power supply to a branching-coupling device 100 is cut off.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention transmits signals sent from other stations to the transmitter/receiver of the own station, and transmits signals output from the transmitter/receiver of the own station to the other stations. This invention relates to a signal branching/coupling device for sending signals.

[Technical background of the invention and its problems]

A conventional signal branching/coupling device 1 will be explained with reference to FIG. This type of device 1 is applied to meeting telephones used for system maintenance, etc., and often has an up line and a down line, so the following explanation will be based on this assumption.

The signal input to the input end R1 of the upper nine lines in FIG.
Output from 2. In addition, the output signal of the OP amplifier 2 is branched and reaches one input terminal of the OP amplifier 4, and from the OP amplifier 4, it is sent to the transmitting/receiving device connected to this signal branching/coupling device 1 via the S terminal. Sent out.

Furthermore, the signal input to the downlink input terminal 1 (2) is OP
It reaches one input terminal of the OP amplifier 6 via the amplifier 5,
The signal is output from this OP amplifier 6 via the output end S1 of the lower nine lines. Further, the output signal I/H of the OP amplifier 5 is branched and reaches the other input terminal of the OP amplifier 4, where it is combined with the output signal of the OP amplifier 2, and connected to the signal branching/combining device 1. The signal is sent to the transmitting/receiving device that is connected via the S terminal.

On the other hand, the signal sent from the above transmitter/receiver is output from the R terminal to the OP amplifier 7-, and is branched to the OP amplifier 7-.
It reaches the other input terminal of each of the amplifier 3 and the OP amplifier 6. Here, the above signal is combined with the output signal of the OP amplifier 2 in the OP amplifier 3 and outputted to the uplink from the output terminal S2. Further, the above signal is transmitted to the OP amplifier 6 by the OP amplifier 5.
It is combined with the output signal ・signal and output from the output terminal S1 to the lower 9 lines.

The signal branching/coupling device 1 having such a configuration is composed of active circuits, and if the power of the signal branching/coupling device 1 is cut off, the upper line and the lower line will be disconnected.

Furthermore, in a system in which a plurality of signal branching/coupling devices 1 as described above are connected in series, there is a drawback that if the power of just one signal branching/coupling device 1 in the line is cut off, the entire system goes down. .

Therefore, as shown by the broken line in FIG. Ke,
1 to the relay contacts between each of the bypass routes 8 and 9. 2 is set for. Then, when the power is turned off, 1.
It is conceivable to close 2 at the same time.

However, according to this, 1. 2 has to be of fairly high quality and reliability, and if the relay contact deteriorates or breaks down, the line quality will deteriorate.
There were times when the line became unusable.

[Purpose of the invention]

The present invention was devised in view of the above-mentioned drawbacks of the conventional devices, and its purpose is to: 'Even when the power is cut off, there is no damage to the transmission characteristics of the line; Even if power is cut off at one station, communication will continue between other stations with normal power.
An object of the present invention is to provide a coupling device.

[Summary of the invention]

Therefore, in the present invention, a first active circuit with high input impedance outputs the received signal to the transmitter/receiver, and the receiver inputs and combines the received signal and the signal sent from the transmitter/receiver. and a second active circuit that passes the signal sent from the transmitting/receiving device to the passive circuit and drives the passive circuit with high impedance.・Configured the coupling device.

[Embodiments of the invention]

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

FIG. 2 is a block diagram of an embodiment of the invention.

This embodiment also has nine uplinks and a downlink.

The signal branching/coupling device 100 shown in the figure receives signals from an input end R1 of the upper line, an input end R2 of the lower line S, and a signal S. Further, signals are outputted from the output end S2 for the upper nine lines, and from the output end S1 for the downlink line. Further, a transmitting/receiving device (not shown) is connected to the terminal S3 and the terminal R3, and a signal outputted from this transmitting/receiving device is transmitted to the terminal R.
3 to the signal branching/coupling device 100, and conversely passed to the transmission/reception device.

A coupling transformer 101 is included in the signal branching/coupling device 100.
A signal input from the input terminal R1 reaches point P□ via this coupling transformer 101, and is branched to an active circuit (first active circuit) 102 and a passive circuit 103.
and will be sent to. Further, the signal inputted from the input ☆5+A R2 arrives at the coupling transformer 104 and reaches 22 points. The signal is branched at 22 points and sent to an active circuit (first active circuit) 105 and a passive circuit 106.

Furthermore, the signal input from the up line is sent from the active circuit 102, and the signal input from the down line is sent from the active circuit 105.
The respective signals are output, combined, amplified to a predetermined value by an amplifier 107, and then sent to a transmitter/receiver (not shown).

In addition, the signal output from the transmitting/receiving device reaches the amplifier 108 from the terminal R3, undergoes constant amplification, and is therefore branched into an active circuit (second active circuit) 1fJ9, 110.
Output to. Furthermore, in the passive circuit 103, the signal 16 input from the 19 line and the signal output from the transmitter/receiver are connected to the active circuit 1.
09 is combined and sent to the output terminal S2. On the other hand, in the passive circuit 106, the signal No. 16 inputted from the 19th line and the signal outputted from the transmitting/receiving device and passed through the active circuit 110 are combined and sent to the output 91M51.

In this example, the active surfaces ji6102, 105c,
The active circuits 109 and 110 are circuits with high input impedance that include an OP amplifier, and the active circuits 109 and 110 include an OP amplifier.
The output impedance is a flat circuit, and the passive circuit 1 (1
3, 106, and the passive circuit 103゜1
It includes a 0.06 Babi current transformer, whose terminals driven by the second active circuits 109 and 110 are terminated by a terminating resistor.

Each will be specifically explained below.

FIG. 3 is a diagram showing active circuits 102 and 105.

In this circuit, resistors R1 and R2 are connected to the ○ terminal and ■ terminal of the OP amplifier ICI, respectively.
The output signal of the coupling transformer 101 (or 104) in FIG. 2 is input from R2. Also, ■terminal and predetermined voltage point NUL
A resistor R3 is connected between the two. Furthermore, OP amplifier I
A resistor R4 is connected between the output terminal of CI and the O terminal. The active plane TM1102, 105, which is a differential amplifier including such an OP amplifier ICI, is a differential amplifier including an OP amplifier ICI.
When considered as ideal, the input impedance is extremely high. In this embodiment, such an active circuit 102
゜105 is used.

FIG. 4 shows passive circuits 103, 106 and active circuit 109.
110. FIG. Active circuits 109, 110
consists of an OP amplifier IC2 and resistors R5 to R9.

The signal output from amplifier 108 in FIG.
The signal is inputted to the θ terminal of the OP amplifier IC2 via the OP amplifier IC2. Further, a resistor R6 is connected between the terminal (2) and the predetermined voltage NUL. A resistor R7 is connected between the output terminal of the OP amplifier and the O terminal. Furthermore, O
A resistor R is connected between the output terminal of P amplifier IC2 and the ■ terminal.
8 and R9 are connected in series, and the connection point P3 between the resistor R8 and the resistor R9 is the output terminal of the active circuits 109 and 110. Active circuits 109 and 110 having such circuit configurations
acts as a constant current and drives the passive circuits 103 and 106.

In FIG. 4, passive circuits 103 and 106 include a hybrid transformer T1 and a resistor ζ connected between the 03 and 04 terminals of the hybrid transformer TI.
10, and a resistor R connected between the 07 and 08 terminals.
It is composed of 11.

The 05 and 06 terminals of the hybrid transformer T1 are
A signal output from the coupling transformer 101 (or 104) in FIG. 2 arrives and is sent out in the direction of the 03 terminal and 04 terminal, and in the direction of the 01 terminal and 02 terminal. As a result, the signals sent toward the 03 and 04 terminals are consumed by the resistor RIO, and the signals sent toward the 01 and 02 terminals are output from the output terminal S 2 (or 81) in Figure 2. .

On the other hand, signals are supplied to terminals 07 and 08 of the hybrid transformer T1 via active circuits 109 and 110. This signal is sent in the direction of the 03 terminal and 04 terminal, and in the direction of the 01 terminal and 02 terminal. The result is the same as described above; therefore, from the 01 and 02 terminals, the signal No. 46 input from the line and the signal output from the transmitter/receiver are combined and output.

According to the signal branching/coupling device 100 configured as described above, in normal times, it performs the same function as the conventional signal branching/coupling device 1 shown in FIG.

When the power to the signal branching/coupling device 100 is cut off, even in this state, the active circuits 102 and 105 shown in FIG.
has an input impedance, the passive circuit 103 (or 10G
), there is no change in impedance on the route to
It does not change the characteristics of the line. Also, even when the power is cut off, the active circuits 109, 1 shown in FIG.
10 has a high output impedance, so it is not in a state disconnected from the hybrid transformer T1, and
Since the terminals 07 and 08 are terminated by the terminating resistor R11, there is no change in the characteristics of the hybrid transformer T1.

Therefore, such a signal branching/coupling device-1-1001
By installing 1100211003--'- at each station of the line as shown in Fig. 5, for example, even if the power supply is 1v1 in the signal branching/coupling device 1002, the signal branching/coupling device ri, 1002 Although the transmitting/receiving device connected to 1002 cannot transmit or receive, the 413 on the line can freely pass through the signal branching/coupling device 1002. Therefore, if the power to the signal branching/coupling device 1002 is cut off, the system may go down. This can improve the reliability of the system.

In the above embodiment, the first active circuit is shown in FIG. 3, and the second active circuit and the passive circuit are shown in FIG. 4, but if the circuits have similar characteristics, Of course, other circuits may also be used.

Generally, the line has an uplink and a downlink, but it is not necessarily limited to this.

〔Effect of the invention〕

As explained above, according to the present invention, even if the power is cut off, the signal (♂) freely passes through the signal branching/coupling device according to the present invention, and the line passage characteristics are not impaired. Therefore, in a system having a line configuration in which a plurality of such devices are connected in series, interruptions due to power interruption do not occur, and the reliability of the system can be improved.

[Brief explanation of the drawing]

1 is a block diagram of a conventional device, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a block diagram of an embodiment of the active circuits 102 and 105 shown in FIG. The figure shows the active circuits 109 and 110 and the passive circuit 10 shown in FIG.
3, a block diagram of an embodiment of 106, and FIG. #It is a block diagram showing the configuration. 100, 100. , too2.1003...
Signal branching/coupling devices 101, 104...coupling transformer 10:3, LOG...passive circuit 102, 105...first active circuit 109, 11
0...Second active circuit ICI, IC2...-'OP
Umph. T1...Hybrid transformer

Claims (5)

[Claims] (1) The receiver has a first active circuit with high input impedance that outputs the received signal to the transmitting/receiving device, and the receiver receives the received signal and the signal sent from the transmitting/receiving device as inputs, and then combines them. A signal branching system characterized by comprising a passive circuit for outputting, and a second active circuit that guides the signal sent from the transmitting/receiving device to the passive circuit and drives the passive circuit with high output impedance. Coupling device. (2) The set consisting of the first active circuit, the second active circuit, and the passive circuit has two sets of reeds, one for the upper line and one for the lower line, and the first set for the upper line and the lower line. The signal branching according to claim (1), characterized in that the output terminals of the second active circuits for the upper line and the input terminals of the second active circuits for the lower nine lines are coupled.・Coupling device. (3) Both the first active circuit and the second active circuit are circuits using operational amplifiers, and the second active circuit is
Claims (1) or (2) characterized in that the circuit operates as a current-driven circuit with respect to a passive circuit.
) Signal branching/coupling device described in section 2. (4) The passive circuit is a circuit using a hybrid transformer, and the terminal receiving the drive input from the second active circuit is terminated with a terminating resistor. ) to (3). (5) Claims Nos. (1) to (4) characterized in that the input signal is input through a coupling transformer.
) The signal branching/coupling device described in any of the above.