Patent ID: 8324936

Claim:
A differential current driving type transmitter comprising: a current source configured to source currents to a pair of transmission lines and sink currents flowing through the pair of transmission lines; a current direction selecting block configured to transfer a current flowing from the current source to a first transmission line of the pair of transmission lines and a current flowing through a second transmission line of the pair of transmission lines to the current source; a balancing switch block configured to initialize the pair of transmission lines to a balanced state, wherein the current source comprises a current supply source which has one terminal connected to a first voltage and the other terminal connected to a first terminal of the current direction selecting block, and a current sink which has one terminal connected to a second voltage and the other terminal connected to a second terminal of the current direction selecting block, wherein the balancing switch block comprises a balancing switch which has one terminal connected to the first transmission line and the other terminal connected to the second transmission line and a resistor component which is disposed between the second transmission line and the balancing switch, a value of the resistor component capable of being changed, and wherein the transmitter further comprises a pre-emphasis circuit comprising: a second current supply source connected to the first voltage, a third current supply source connected to the first voltage, a second current sink connected to the second voltage, a third current sink connected to the second voltage, a sixth switch, a seventh switch, an eighth switch, and a ninth switch, wherein the sixth switch and the eighth switch are connected to the first transmission line, and wherein the sixth switch and the eighth switch are positioned on the same line between the second current supply source and the second current sink, wherein the seventh switch and the ninth switch are connected to the second transmission line, and wherein the seventh switch and the ninth switch are positioned on the same line between the third current supply source and the third current sink, and wherein the sixth switch and the ninth switch, or the seventh switch and the eighth switch, can be simultaneously opened to increase a data transmission speed of the transmitter.