Duty-cycle correction circuit for differential clocking

摘要

A completely differential approach to correcting duty-cycle distortions of a differential clock signal propagating through a differential amplifier. A duty-cycle distortion correction (DCDC) differential amplifier circuit/device is provided with a differential amplifier whose output wires are coupled to a correction circuit. The correction circuit comprises a differential low pass filter and a differential correction amplifier. The differential correction amplifier's output is dotted back into the output of the amplifier. The differential output of the amplifier is passed through the low pass filter, which provides differential DC output signals that triggers respective correction amplifier transistors to generate an inverted correction current that is added back to respective differential output pulse. The DCDC differential amplifier provides a completely differential approach to correction of duty-cycle distortions within the differential output.