Offset compensation apparatus in a differential amplifier circuit and offset compensation method thereof

摘要

The present invention relates to an offset compensation apparatus in a differential amplifier circuit and an offset compensation method thereof that can compensate an offset in a differential amplifier circuit separately for each input signal. The offset compensation device preferably selectively couples a capacitor to an input of a differential amplifier to store an offset voltage. The offset compensation method preferably can operate by detecting an offset of the differential amplifier circuit, by storing the offset, by directly inputting the result of compensating the offset voltage for an input voltage into the differential amplifier and by outputting the output voltage corresponding to the input voltage without the offset voltage included. The differential amplifier circuit and the offset compensation method can further include an additional output stage coupled to a load.