Differential signal output apparatus, semiconductor integrated circuit apparatus having the differential signal output apparatus, and differential signal transmission system

A differential signal output apparatus comprising:

• a first differential pair receiving differential signals, said first differential pair having first transistors;
• a first current source, connected to one end of the first differential pair at a first branching node branching current from the first current source to the first transistors;
• a second differential pair receiving the differential signals, said second differential pair having second transistors;
• a second current source connected to one end of the second differential pair at a second branching node branching current from the second current source to the second transistors;
• and
• a transitional response circuit forming a current path allowing one of the current supplied from one of the first and second current sources to flow when the current to one of the first and second differential pair is cut off,
• wherein the transitional response circuit is a capacitor.

A semiconductor integrated circuit apparatus provided with a differential output circuit comprising:

• a first differential pair constituted by arranging wiring between differential input signals and differential output signals arranging first transistors symmetrically;
• a first current source connected to one end of the first differential pair so arranged that first connection wiring lines to the first transistors be symmetrical;
• and
• a second differential pair constituted by arranging wiring between the differential input signals and the differential output signals arranging second transistors symmetrically;
• a second current source connected to one end of the second differential pair so arranged that second connection wiring lines to the second transistors be symmetrical;
• and
• a capacitor, provided between a first branching node and a second branching node for the first and second connection wiring lines from the first current source and the second current source to the first and second transistors, and directly connected to the first branching node and the second branching node.

A semiconductor integrated circuit apparatus provided with a differential output circuit comprising:

• a first differential pair constituted by arranging wiring between differential input signals and differential output signals arranging first transistors symmetrically;
• a first current source connected to one end of the first differential pair so arranged that first connection wiring lines to the first transistors be symmetrical;
• a second differential pair constituted by arranging wiring between the differential input signals and the differential output signals arranging second transistors symmetrically;
• a second current source connected to one end of the second differential pair so arranged that second connection wiring lines to the second transistors be symmetrical;
• and
• a capacitor, provided between a first branching node and a second branching node for the first and second connection wiring lines from the first current source and the second current source to the first and second transistors, and directly connected to the first branching node and the second branching node,
• wherein a current supply ability of the second current source is same as or greater than a current supply ability of the first current source.

A semiconductor integrated circuit apparatus provided with a

• differential output circuit comprising:
• a first differential pair constituted by arranging wiring between differential input signals and between differential output signals and arranging transistors of a first conductivity type symmetrically;
• a first current source connected to one end of the first differential pair and so arranged that connection wiring lines to the transistors of the first conductivity type be symmetrical;
• a second differential pair arranged opposite to the first differential pair, constituted by arranging wiring between differential input signals and between differential output signals and arranging transistors of a second conductivity type symmetrically;
• a second current source connected to one end of the second differential pair and so arranged that connection wiring lines to the transistors of the second conductivity type be symmetrical;
• and
• a capacitor, provided between a first branching node for branching connection wiring from the first current source to the transistors of the first conductivity type and a second branching node for branching connection wiring from the second current source to the transistors of the second conductivity type, and directly connected to the first branching node and the second branching node.

A differential signal transmission system provided with a differential output circuit, the differential output circuit comprising:

• a first differential input unit into which differential signals are entered;
• a first current supply unit supplying a current to the first differential input unit;
• a second differential input unit into which the differential signals are entered;
• a second current supply unit supplying a current to the second differential input unit;
• and
• a capacitor, provided between a first connection node between the first differential input unit and the first current supply unit and a second connection node between the second differential input unit and the second current supply unit, and being directly connected to the first branching node and the second branching node.

A differential signal transmission system provided with a differential output circuit, the differential output circuit comprising:

• a first differential input unit into which differential signals are entered;
• a first current supply unit supplying a current to the first differential input unit;
• a second differential input unit into which the differential signals are entered;
• a second current supply unit supplying a current to the second differential input unit;
• and
• a capacitor, provided between a first connection node and a second connection node, which is directly connected to the first branching node and the second branching node, and the first and second connection nodes respectively connecting the first current supply unit to the first differential input unit and the second current supply unit to the second differential input unit,
• wherein a current supply ability of the second current supply unit is same as or greater than a current supply ability of the first current supply unit.

A differential signal transmission system provided with a differential output circuit, the differential signal transmission system comprising:

• a first differential input unit configured in a first conductivity type entering differential signals;
• a first current supply unit supplying a current to the first differential input unit;
• a second differential input unit configured in a second conductivity type, of which differential output terminals are connected to differential output terminals of the first differential input unit to receive the differential signals;
• a second current supply unit supplying a current to the second differential input unit;
• and
• a capacitor, provided between a connection node between the first differential input unit and the first current supply unit and another connection node between the second differential input unit and the second current supply unit, and being directly connected to the connection node and the another connection node.

A differential signal output apparatus comprising:

• a first differential pair to receive differential signals;
• a first current source connected to the first differential pair at a first branching node;
• a second differential pair to receive the differential signals;
• a second current source connected to the second differential pair at a second branching node;
• and
• a capacitor, provided between the first branching node and the second branching node, and being directly connected to the first branching node and the second branching node.