Unified all-digital duty-cycle and phase correction circuit for QDR I/O interface

A unified all-digital duty-cycle and phase correction circuit, consisting of dual duty cycle corrector loops and one shared control block, is proposed for a quadrature data rate I/O interface. The proposed scheme makes four duty-corrected and phase-corrected phase clocks from two clocks of 0deg and 90deg using the sequential three steps correction. The use of a newly devised duty cycle detector, w...