Differential amplifier, differential amplifying method, and phase locked loop and delay locked loop using the same

摘要

A differential amplifier includes an input stage, a biasing unit and a load unit. The input stage receives a first phase signal and at least two phase signals among odd-numbered phase signals, wherein an average of phases of the at least two phase signals has a phase difference of substantially 180 degrees from the first phase signal. The biasing unit is coupled between the input stage and a first power voltage. The load unit is coupled between the input stage and a second power voltage, and configured to output a differential output signal based on differentially amplifying of the first phase signal and the at least two phase signals. Therefore, a duty cycle distortion in an output signal of a duty cycle correction circuit can be prevented.