Patent ID: 6064248
Filing Date: 2000-05-16
Classification: H04L

Abstract:
A clock pulse transmission circuit including a transmitting unit for outputting a first pair of positive and negative clock pulses to transmit them, a receiving unit for receiving said first pair of positive and negative clock pulses transmitted from said transmitting unit and outputting a second pair of positive and negative clock pulses, and signal transmission paths for connecting between said transmitting unit and said receiving unit, and wherein said receiving unit comprises:receiver means for outputting the second pair of positive and negative clock pulses in response to clock pulses transmitted from said transmitting unit through said signal transmission paths and supplied to input terminals of said receiver means;first and second filter means for taking out direct current (DC) components of the second pair of positive and negative clock pulses outputted from said receiver means, respectively; anda first buffer circuit and a second buffer circuit for transmitting respective output signals of said first and second filter means to said transmitting unit through a pair of control signal transmission paths;and wherein said transmitting unit comprises:a time constant circuit for outputting a clock signal having sloping leading edges and sloping trailing edges;a driver for comparing the output clock signal of said time constant circuit with a threshold voltage, outputting the first pair of positive and negative clock pulses corresponding to a difference between the output clock signal of said time constant circuit and the threshold voltage, and transmitting the first pair of positive and negative clock pulses to said receiving unit;differential amplifier means for finding a difference between output signals respectively transmitted from said first and second buffer circuits in said receiving unit to detect an error in duty factory of said second pair of positive and negative clock pulses outputted from said receiver means in said receiving unit; andintegrator means for integrating an output signal of said differential amplifier means to supply an integrated value to said driver as the threshold voltage.