Duty cycle correctors and methods of operating the same

Abstract

A duty cycle corrector includes a delay chain, an edge detector, a falling edge shift (FES) controller, a plurality of falling edge modulator (FEM) cores, and a phase interpolator. The delay chain delays a first clock to generate a delay clock, and generates first and second sampling control signals. The edge detector samples the first clock and a second clock using the first and second sampling control signals to obtain first and second sampling signals. The FES controller determines a modulation direction and a modulation width based on the first and second sampling signals. The plurality of FEM cores first modulate the first edge of the first clock and second modulate the first edge of the delay clock using the modulation direction and the modulation width. The phase interpolator performs phase interpolation on the results of the first and second modulations.