An operational amplifier compensation circuit includes: a first transistor activated/deactivated in response to a signal level difference between an input signal applied to an operational amplifier and an output signal provided by the operational amplifier, a first signal amplifying circuit including a second transistor and a first load, wherein the first signal amplifying circuit is configured to generate a first gate voltage amplified in response to the voltage level difference between the input signal and the output signal in relation to an internal resistance of the second transistor and a resistance of the first load when the first transistor is activated, and a third transistor configured to generate a first compensation current in response to the amplified first gate voltage and provide the first compensation current to the operational amplifier.

An operational amplifier (OPA) includes an output stage composed of a P-type output transistor and an N-type output transistor connected in series between a power supply and ground, the N-type output transistor being controlled by a first control voltage and the P-type output transistor being controlled by a second control voltage; a first leakage eliminating circuit configured to prevent a sinking current through the N-type output transistor from entering the ground when an input voltage rises from a low voltage level to a high voltage level; and a second leakage eliminating circuit configured to prevent a sourcing current through the P-type output transistor from entering a load when the input voltage falls from the high voltage level to the low voltage level.

The techniques described herein relate to a circuit including an operational amplifier that includes a differential amplifier, a capacitor, and an output stage. The differential amplifier includes a first input and a second input. The output stage is configured to generate an output voltage. The circuit includes a slew-rate boost circuitry connected to the operational amplifier. The slew-rate boost circuitry is configured to detect a voltage differential between the first input and the second input and apply, at an output of the differential amplifier, a boost current to charge the capacitor during a period of time in which the output voltage increases or decreases to a target voltage level.