A high-voltage operational amplifier (hvopamp) using dual-input floating-gate transistors for its feedback network is presented. The proposed hvopamp stabilizes the output DC voltage in the middle of its high-voltage power supply. Using floating-gate transistors eliminates the need for high-voltage resistor feedback networks. The integral nonlinearity (INL) of the hvopamp with floating gate feedback is 7% in the rail-to-rail output range, which is better than the performance of circuit using parasitic field-oxide MOS transistor as feedback network. The designer does not need to develop a new component, and can implement easily floating-gate transistors in most technologies, which facilitates design and improves the circuit robustness.