Buffer circuit having an enhanced slew-rate and source driving circuit including the same

A buffer circuit, comprising:

• an operational amplifier configured to amplify an input voltage signal and to generate an output voltage signal;
• and
• a slew-rate compensating circuit configured to generate a compensation current based on a voltage difference between the input voltage signal and the output voltage signal, and to provide the compensation current to a load stage of the operational amplifier,
• wherein the slew-rate compensating circuit is configured to generate a push compensation current that flows into the operational amplifier and a pull compensation current that flows out of the operational amplifier, wherein the slew-rate compensating circuit comprises:
• a comparator configured to compare the input voltage signal with the output voltage signal and to generate a first current corresponding to the voltage difference;
• a pull compensation current generator configured to perform a current-mirror operation on the first current and to generate the pull compensation current;
• and
• a push compensation current generator configured to perform the current-mirror operation on the first current and to generate the push compensation current.