Patent ID: 7269094
Filing Date: 2007-09-11
Classification: G11C

Abstract:
1. A circuit for generating a strobe signal, comprising: a delay-lock loop receiving an input clock signal, the delay-lock loop comprising: a phase detector having first input terminal receiving the input clock signal and second input terminal receiving a feedback clock signal, the phase detector being operable to generate at an output terminal a phase control voltage having a magnitude corresponding to the phase difference between input clock signal and the feedback clock signal; and a delay line having an input coupled to receive the input clock signal, the delay line outputting a delayed clock signal having a phase relative to the phase of the input clock signal that is controlled by the phase control voltage; a phase generator circuit coupled to receive the delayed clock signal from the delay line, the phase generator circuit generating a first strobe signal and a second strobe signal from the delayed clock signal, the second strobe signal having a phase offset from the first strobe signal of 90 degrees; and a feedback path coupling the first strobe signal to the second input of the phase detector as the feedback clock signal.