The Design and Simulation of Single-bit-data Blind Oversampling Data-recovery Circuit for USB2.0 Interface

Abstract

In order to propose a new single-bit-data blind oversampling data-recovery circuit for the USB2.0 interface, the circuit is designed and simulated correctly by using dynamic sampling window to sample the signal. Based on the dynamic sampling window, the circuit selects the right data from the 5X sampled data and decides the proper next sampling window on the basis of both the edge of sampled data and the position of current sampling window. The proposed circuit by using dynamic sampling window simplifies the sampling algorithm and reduces the scale of circuit compared to conventional circuits. Moreover, this proposed circuit is available on account of the simulation result at the frequency of 480MHz and test vectors of 1000,000 bit based on 0.18 um CMOS technology library.