RECEIVER BLOCK INCLUDING GAIN-VARIABLE COMPARATORS BASED ON AN INPUT VOLTAGE SWING RANGE AND METHOD OF CONTROLLING A GAIN OF THE GAIN-VARIABLE COMPARATORS

摘要

A receiver circuit including a gain-variable comparator based on an input voltage swing range and a method of controlling a gain of the gain-variable comparator are provided to be suitable for a CMOS process and be flexibly operated under various interface protocols. A variable gain clock comparator(110) receives a differential clock signal and compares and amplifies the differential clock signals based on a variable open loop gain. A variable gain data comparator(120a,120b,120n) receives a differential data signal and compares and amplifies the differential data signal based on the variable open loop gain. A detecting unit(130) receives, compares and amplifies the differential clock signal and generates a detecting signal indicating a voltage swing range of the differential clock signal. A schmitt trigger(150) stabilizes a voltage level of a detecting signal. A controller(160) generates a control signal which controls the open loop gain of the variable gain clock comparator with the variable gain data comparator.