Abstract: A method and apparatus that cancels or reduces DC offset in a fully-differential optical receiver. The method includes receiving differential optical signals, converting, with photodetectors, the differential optical signals to differential current signals representative of the differential optical signals, converting, using a transimpedance amplifier, the differential current signals to differential intermediate voltage signals, amplifying, using a main amplifier, the differential intermediate voltage signals to generate differential output voltage signals, and cancelling a DC component of the differential output voltage signals using a fully differential DC cancellation circuit. Output offset may also be cancelled or reduced using digital control.

Abstract: A method and apparatus that cancels or reduces DC offset in a fully-differential optical receiver. The method includes receiving differential optical signals, converting, with photodetectors, the differential optical signals to differential current signals representative of the differential optical signals, converting, using a transimpedance amplifier, the differential current signals to differential intermediate voltage signals, amplifying, using a main amplifier, the differential intermediate voltage signals to generate differential output voltage signals, and cancelling a DC component of the differential output voltage signals using a fully differential DC cancellation circuit. Output offset may also be cancelled or reduced using digital control.

Abstract: Embodiments of the present invention provide a level converter circuit with a resistor and a current adjustment circuit. The resistor is connected between an input and an output of the level converter circuit. The current adjustment circuit is configured to influence a current through the resistor such that an output voltage of the level converter circuit does not exceed a maximum allowable value.

Abstract: Embodiments of the present invention provide a level converter circuit with a resistor and a current adjustment circuit. The resistor is connected between an input and an output of the level converter circuit. The current adjustment circuit is configured to influence a current through the resistor such that an output voltage of the level converter circuit does not exceed a maximum allowable value.

Abstract: An apparatus with two pairs of lines including a first and second channel further includes a phantom channel that is implemented to provide a third channel without physically installing lines. Based on a differential signal, a first common-mode signal level is generated at a first output of a differential amplifier circuit, and a second common-mode signal level on a second output, and the first common-mode signal level is applied to the lines of the first pair of lines and the second common-mode signal level to the lines of the second pair of lines. An extraction circuit is implemented to extract common-mode portions on the lines of the first pair of lines and the lines of the second pair of lines.