Transmitting device, receiving device, repeating device, and transmission/reception system

A transmitting device comprising:

• a high-speed signal generator which generates a high-speed electric signal whose frequency band is limited, the high-speed electric signal generator having an output terminal provided to output the high-speed electric signal;
• a low-speed signal generator which generates a low-speed electric signal of a frequency lower than the frequency band of the high-speed signal, the low-speed electric signal generator having an output terminal provided to output the low-speed electric signal;
• and
• a signal superimposing unit which generates a superimposed signal by superimposing the high-speed electric signal and the low-speed electric signal, the signal superimposing unit having a first input terminal electrically connected to the output terminal of the high-speed signal generator and provided to take the high-speed electric signal in, a second input terminal electrically connected to the output terminal of the low-speed signal generator and provided to take the low-speed electric signal in, and an output terminal provided to output the superimposed signal,
• wherein
• the low-speed signal generator generates the low-speed electric signal with spread spectrum, and
• wherein
• the high-speed signal generator generates the high-speed electric signal with spread spectrum.

A transmitting device comprising:

• a high-speed signal generator which generates a high-speed electric signal whose frequency band is limited, the high-speed electric signal generator having an output terminal provided to output the high-speed electric signal;
• a low-speed signal generator which generates a low-speed electric signal of a frequency lower than the frequency band of the high-speed signal, the low-speed electric signal generator having an output terminal provided to output the low-speed electric signal;
• and
• a signal superimposing unit which generates a superimposed signal by superimposing the high-speed electric signal and the low-speed electric signal, the signal superimposing unit having a first input terminal electrically connected to the output terminal of the high-speed signal generator and provided to take the high-speed electric signal in, a second input terminal electrically connected to the output terminal of the low-speed signal generator and provided to take the low-speed electric signal in, and an output terminal provided to output the superimposed signal,
• wherein
• the high-speed signal generator includes a serializer which converts parallel data to serial data and outputs the serial data as the high-speed electric signal through the output terminal of the high-speed signal generator, and
• the low-speed signal generator includes a phase locked loop circuit which generates a designation clock designating a timing of each bit of the serial data outputted from the serializer and supplies the designation clock to the serializer, and a wiring structure for outputting, as the low-speed electric signal, a clock inputted to the phase locked loop circuit or a clock outputted from the phase locked loop circuit to the signal superimposing unit through the output terminal of the low-speed signal generator.

A transmitting device comprising:

• a high-speed signal generator which generates a high-speed electric signal whose frequency band is limited, the high-speed electric signal generator having an output terminal provided to output the high-speed electric signal;
• a low-speed signal generator which generates a low-speed electric signal of a frequency lower than the frequency band of the high-speed signal, the low-speed electric signal generator having an output terminal provided to output the low-speed electric signal;
• and
• a signal superimposing unit which generates a superimposed signal by superimposing the high-speed electric signal and the low-speed electric signal, the signal superimposing unit having a first input terminal electrically connected to the output terminal of the high-speed signal generator and provided to take the high-speed electric signal in, a second input terminal electrically connected to the output terminal of the low-speed signal generator and provided to take the low-speed electric signal in, and an output terminal provided to output the superimposed signal,
• wherein
• the signal superimposing unit includes a first current mode logic circuit and a second current mode logic circuit which shares a resistor disposed between a power supply potential feed terminal and a ground potential feed terminal, the first current mode logic circuit and the second current mode logic circuit being disposed between the resistor and the ground potential feed terminal,
• the first current mode logic circuit has an input terminal provided to take the high-speed electric signal in, and an output terminal electrically connected to the output terminal of the signal superimposing unit, and
• the second current mode logic circuit has an input terminal provided to take the low-speed electric signal in, and an output terminal electrically connected to the output terminal of the signal superimposing unit.

A transmitting device comprising:

• a high-speed signal generator which generates a high-speed electric signal whose frequency band is limited, the high-speed electric signal generator having an output terminal provided to output the high-speed electric signal;
• a low-speed signal generator which generates a low-speed electric signal of a frequency lower than the frequency band of the high-speed signal, the low-speed electric signal generator having an output terminal provided to output the low-speed electric signal;
• and
• a signal superimposing unit which generates a superimposed signal by superimposing the high-speed electric signal and the low-speed electric signal, the signal superimposing unit having a first input terminal electrically connected to the output terminal of the high-speed signal generator and provided to take the high-speed electric signal in, a second input terminal electrically connected to the output terminal of the low-speed signal generator and provided to take the low-speed electric signal in, and an output terminal provided to output the superimposed signal,
• wherein
• the signal superimposing unit includes
• a power supply circuit which outputs a drive voltage amplitude-modulated by the low-speed electric signal, and
• a buffer driven to superimpose the high-speed electric signal and the low-speed electric signal by the drive voltage applied from the power supply circuit, the buffer having an input terminal provided to take the high-speed electric signal in, and an output terminal electrically connected to the output terminal of the signal superimposing unit and provided to output the superimposed signal.

A receiving device comprising:

• a signal separator which separates a superimposed signal, obtained by superimposing a high-speed electric signal whose frequency band is limited and a low-speed electric signal of a frequency lower than the frequency band of the high-speed electric signal, into the high-speed electric signal and the low-speed electric signal, the signal separator having an input terminal provided to receive the superimposed signal, a first output terminal provided to output the high-speed electric signal separated from the superimposed signal, and a second output terminal provided to output the low-speed electric signal separated from the superimposed signal;
• and
• a recovery unit which performs frequency tracking on the basis of the low-speed electric signal outputted from the second output terminal of the signal separator, performs phase tracking on the basis of the high-speed electric signal outputted from the first output terminal of the signal separator, and recovers a clock and data, the recovery unit having a first input terminal electrically connected to the first output terminal of the signal separator and provided to take the high-speed electric signal in, and a second input terminal electrically connected to the second output terminal of the signal separator and provided to take the low-speed electric signal in, wherein
• a data rate DR of the high-speed electric signal, a coefficient K corresponding to a data communication system of the high-speed electric signal, a frequency F of the low-speed electric signal, and a ratio (M/N) of a frequency of the clock to the frequency of the low-speed electric signal at an end of frequency tracking by the recovery unit satisfy a relationship represented by the following Formula (1).
• DR
• K
• =
• F
• ·
• M
• N
• .
• (
• 1
• )

A repeating device comprising:

• a signal separator which separates a superimposed signal, obtained by superimposing a high-speed electric signal whose frequency band is limited and a low-speed electric signal of a frequency lower than the frequency band of the high-speed electric signal, into the high-speed electric signal and the low-speed electric signal, the signal separator having an input terminal provided to receive the superimposed signal, a first output terminal provided to output the high-speed electric signal separated from the superimposed signal, and a second output terminal provided to output the low-speed electric signal separated from the superimposed signal;
• a recovery unit which performs frequency tracking on the basis of the low-speed electric signal outputted from the second output terminal of the signal separator, performs phase tracking on the basis of the high-speed electric signal outputted from the first output terminal of the signal separator, and recovers a clock and data, the recovery unit having a first input terminal electrically connected to the first output terminal of the signal separator and provided to take the high-speed electric signal in and a second input terminal electrically connected to the second output terminal of the signal separator and provided to take the low-speed electric signal in;
• and
• a signal superimposing unit which outputs a superimposed signal, the superimposed signal being obtained by superimposing the high-speed electric signal obtained from the recovered data and a signal generated on the basis of the recovered clock or the low-speed electric signal outputted from the second output terminal of the signal separator, the signal superimposing unit having a first input terminal provided to take the high-speed electric signal in, a second input terminal provided to take in the signal generated on the basis of the recovered clock or the low-speed electric signal, and an output terminal provided to output the superimposed signal.

A transmission/reception system comprising:

• (1) a transmitting device comprising:
• a high-speed signal generator which generates a high-speed electric signal whose frequency band is limited, the high-speed signal generator having an output terminal provided to output the high-speed electric signal;
• a low-speed signal generator which generates a low-speed electric signal of a frequency lower than the frequency band of the high-speed electric signal, the low-speed electric signal generator having an output terminal provided to output the low-speed electric signal;
• and
• a signal superimposing unit which generates a superimposed signal by superimposing the high-speed electric signal and the low-speed electric signal, the signal superimposing unit having a first input terminal electrically connected to the output terminal of the high-speed signal generator and provided to take the high-speed electric signal in, a second input terminal electrically connected to the output terminal of the low-speed signal generator and provided to take the low-speed electric signal in, and an output terminal provided to output the superimposed signal;
• and
• (2) a receiving device which receives the superimposed signal outputted from the transmitting device and then arrived at the receiving device through a communication link, the receiving device comprising:
• a signal separator which separates the superimposed signal into the high-speed electric signal and the low-speed electric signal, the signal separator having an input terminal provided to receive the superimposed signal, a first output terminal provided to output the high-speed electric signal separated from the superimposed signal, and a second output terminal provided to output the low-speed electric signal separated from the superimposed signal;
• and
• a recovery unit which performs frequency tracking on the basis of the low-speed electric signal outputted from the second output terminal of the signal separator, performs phase tracking on the basis of the high-speed electric signal outputted from the first output terminal of the signal separator, and recovers a clock and data, the recovery unit having a first input terminal electrically connected to the first output terminal of the signal separator and provided to take the high-speed electric signal in, and a second input terminal electrically connected to the second output terminal of the signal separator and provided to take the low-speed electric signal in.

A transmission/reception system comprising:

• (1) a transmitting device comprising:
• a high-speed signal generator which generates a high-speed signal whose frequency band is limited, the high-speed signal generator having an output terminal provided to output the high-speed signal;
• a low-speed signal generator which generates a low-speed signal of a frequency lower than the frequency band of the high-speed signal, the low-speed signal generator having an output terminal provided to output the low-speed signal;
• and
• a first signal superimposing unit which generates a superimposed signal by superimposing the high-speed signal and the low-speed signal, the first signal superimposing unit having a first input terminal electrically connected to the output terminal of the high-speed signal generator and provided to take the high-speed signal in, a second input terminal electrically connected to the output terminal of the low-speed signal generator and provided to take the low-speed signal in, and an output terminal provided to output the superimposed signal;
• (2) one or more repeating devices each receiving the superimposed signal outputted from the transmitting device and then arrived at the repeating device through a communication link and output a received superimposed signal, each of one or more repeating devices comprising:
• a first signal separator which separates the superimposed signal into the high-speed signal and the low-speed signal, the first signal separator having an input terminal provided to receive the superimposed signal, a first output terminal provided to output the high-speed signal separated from the superimposed signal, and a second output terminal provided to output the low-speed signal separated from the superimposed signal;
• a first recovery unit which performs frequency tracking on the basis of the low-speed signal outputted from the second output terminal of the first signal separator, performs phase tracking on the basis of the high-speed signal outputted from the first output terminal of the first signal separator, and recovers a clock and data, the first recovery unit having a first input terminal electrically connected to the first output terminal of the first signal separator and provided to take the high-speed signal in and a second input terminal electrically connected to the second output terminal of the first signal separator and provided to take the low-speed signal in;
• and
• a second signal superimposing unit which outputs a superimposed signal, the superimposed signal being obtained by superimposing the high-speed signal obtained from the recovered data and a signal generated on the basis of the recovered clock or the low-speed signal outputted from the second output terminal of the first signal separator, the second signal superimposing unit having a first input terminal provided to take the high-speed signal in, a second input terminal provided to take in the signal generated on the basis of the recovered clock or the low-speed signal, and an output terminal provided to output the superimposed signal;
• and
• (3) a receiving device which receiving the superimposed signal arrived at the receiving device through the communication link on which the one or more repeating devices are disposed, the receiving device comprising:
• a second signal separator which separates the superimposed signal into the high-speed signal and the low-speed signal, the second signal separator having an input terminal provided to receive the superimposed signal, a first output terminal provided to output the high-speed signal separated from the superimposed signal, and a second output terminal provided to output the low-speed signal separated from the superimposed signal;
• and
• a second recovery unit which performs frequency tracking on the basis of the low-speed signal outputted from the second output terminal of the second signal separator, performs phase tracking on the basis of the high-speed signal outputted from the first output terminal of the second signal separator, and recovers a clock and data, the second recovery unit having a first input terminal electrically connected to the first output terminal of the second signal separator and provided to take the high-speed signal in, and a second input terminal electrically connected to the second output terminal of the second signal separator and provided to take the low-speed signal in.

A transmitting device comprising:

• a high-speed signal generator which generates a high-speed electric data signal whose frequency band is limited, the high-speed electric data signal generator having an output terminal provided to output the high-speed electric data signal;
• a low-speed signal generator which generates a low-speed electric clock signal of a frequency lower than the frequency band of the high-speed signal, the low-speed electric clock signal generator having an output terminal provided to output the low-speed electric clock signal;
• and
• a signal superimposing unit which generates a superimposed signal by superimposing the high-speed electric data signal and the low-speed electric clock signal, the signal superimposing unit having a first input terminal electrically connected to the output terminal of the high-speed signal generator and provided to take the high-speed electric data signal in, a second input terminal electrically connected to the output terminal of the low-speed signal generator and provided to take the low-speed electric clock signal in, and an output terminal provided to output the superimposed signal,
• wherein the signal superimposing unit further comprises:
• a first resistor coupled to a first terminal;
• and
• a second resistor coupled to a second terminal,
• wherein the output terminal comprises the first terminal and the second terminal, the first terminal is coupled to a power supply via the first resistor, and the second terminal is coupled to the power supply via the second resistor.