DIGITAL PHASE DETECTOR IN RAMBUS DRAM

摘要

PURPOSE: A digital phase detector in a Rambus DRAM is provided to simplify circuit structure without using an integrating circuit and to minimize offset generation by processing signal digitally. CONSTITUTION: A digital phase detector inputs the first and second input signals and detects phase difference between the first input signal and the second input signal. A phase comparator(120) compares the first and second input signals in response to main clock signal and generates up and down signals depending on the comparison result. An up/down signal counter(122) counts the up and down signals in response to the main clock signal and outputs comparison signal which is resulted from comparison of the counted results as phase detection result for the first and second input signals.