An input circuit comprises an input terminal for receiving an input signal, an output terminal for outputting an output signal, a node connected to the input terminal, a terminating resistor connected between the node and a ground, a potential shift element connected between the node and the output terminal, a potential source for supplying a predetermined potential, and a current source connected between the potential source and the output terminal.
1. An input circuit comprising:
an input terminal for receiving an input signal;
an output terminal for outputting an output signal;
a node connected to said input terminal;
a terminating resistor connected between said node and a ground;
a potential shift element connected between said node and said output terminal;
a potential source for supplying a predetermined potential; and
a current source connected between said potential source and said output terminal;
wherein said potential source is a positive potential source, wherein said current source is a transistor, and wherein the transistor has a source and a gate connected to said output terminal and a drain connected to the positive potential source.
2. The input circuit according to claim 1 , wherein said potential shift element is a diode.
3. The input circuit according to claim 2 , wherein the diode has an anode connected to said output terminal and a cathode connected to said node.
4. An input circuit comprising:
a positive-phase input terminal for receiving a positive-phase input signal;
a negative-phase input terminal for receiving a negative-phase input signal;
a positive-phase output terminal for outputting a positive-phase output signal therefrom;
a negative-phase output terminal for outputting a negative-phase output signal therefrom;
a first node connected to said positive-phase input terminal;
a second node connected to said negative-phase input terminal;
a first terminating resistor connected between said first node and a ground;
a second terminating resistor connected between said second node and the ground;
a first potential shift element connected between said first node and said positive-phase output terminal;
a second potential shift element connected between said second node and said negative-phase output terminal;
a potential source for supplying a predetermined potential;
a current source connected to said potential source;
a first current adjusting element connected between said current source and said positive-phase output terminal; and
a second current adjusting element connected between said current source and said negative-phase output terminal.
5. The input circuit according to claim 4 , wherein said potential source is a negative potential source.
6. The input circuit according to claim 5 , wherein said first and second potential shift elements are diodes respectively.
7. The input circuit according to claim 6 , wherein said each diode has an anode connected to said first or second node and a cathode connected to the corresponding output terminal.
8. The input circuit according to claim 7 , wherein said current source is a transistor.
9. The input circuit according to claim 8 , wherein the transistor has a source and a gate connected to the negative potential source.
10. The input circuit according to claim 4 , wherein said first and second current adjusting elements are transistors respectively.
11. An input circuit comprising:
an input terminal for receiving an input signal;
an output terminal for outputting an output signal;
a node connected to said input terminal;
a potential source for supplying a predetermined potential;
a terminating resistor connected between said node and said potential source;
a capacitor connected between said potential source and a ground;
a potential shift element connected between said node and said output terminal; and
a current source connected between said ground and said output terminal.
12. The input circuit according to claim 11 , wherein said potential source is a positive potential source, wherein said potential shift element is a diode, and wherein said diode has an anode connected to said node and a cathode connected to said output terminal.