Current-mode logic circuit

A current-mode logic circuit comprising:

• a transmitter module comprising:
• an output impedance circuit providing an adjustable output resistor, wherein the adjustable output resistor comprises floating resistors and/or pull-up resistors;
• a switch circuit, coupled to the output impedance circuit, receiving differential input signals, outputting differential output signals, and controlling high-low level switching of the differential input signals and the differential output signals according to the adjustable output resistor;
• and
• a current source, coupled to the output impedance circuit and the switch circuit, providing currents to the output impedance circuit and the switch circuit,
• wherein the floating resistors are resistors coupled between the differential output signals, and the pull-up resistors are resistors coupled between the differential output signals and a first power source,
• wherein the output impedance circuit comprises a plurality of output impedance sub-circuits which are coupled in parallel,
• wherein each of the plurality of output impedance sub-circuits comprises a first resistor, a second resistor, a first switch, a second switch, and a third switch,
• wherein terminals of the first resistors on one side are coupled together at a first common terminal, and terminals of the second resistors on one side are coupled together at a second common terminal,
• wherein for each output impedance sub-circuit, the other terminal of the first resistor is coupled to one terminal of the first switch and one terminal of the second switch, the other terminal of the first switch is coupled to the other terminal of the second resistor and one terminal of the third switch, and the other terminal of the second switch is coupled to the other terminal of the third switch and then coupled to the first power source, and
• wherein the first common terminal and the second common terminal generate the differential output signals respectively.