本文研究了一种低噪声高压高输出电流功率运算放大器，包含了低噪声PMOS输入级、电压增益级以及一个由跨导线性环偏置的Class AB输出级。为确保运算放大器的稳定性，采用Cascode频率补偿。为确保电路的可靠性，集成了具有迟滞特性的过温保护电路与限流电路，防止输出功率管在极端工况下发生热烧毁。电路设计基于SMIC 180 nm BCD工艺，采用60V DMOS与1.8V CMOS晶体管，工作电压范围±（4 - 30）V，工作温度范围为-55℃ - +125℃。仿真验证结果显示该运放的等效输入电压噪声为8.85 nV/√Hz，输出电流可达400mA，直流增益为143.3dB，单位增益带宽为6.80 MHz，压摆率为33.7 V/μs，失调电压为33.74 μV，芯片面积为1.79×1.12 mm2。该运算放大器在车载电子系统的精密采样、传感器接口及功率器件驱动等领域具有广阔的应用前景。

This paper presents a low-noise, high-voltage, high-output-current power operational amplifier designed in a SMIC 180 nm BCD process. The architecture features a low-noise PMOS input stage, a voltage gain stage, and a Class AB output stage biased by a transconductance linear loop. Stability is ensured by Cascode frequency compensation, while integrated hysteretic over-temperature and current-limiting circuits provide robust protection against thermal and electrical damage. Combining 60V DMOS and 1.8V CMOS devices, the amplifier operates over a wide supply range of ±4V to ±30V and a temperature range of -55°C to +125°C. Simulation results demonstrate an equivalent input voltage noise of 8.85 nV/√Hz, a 400mA output current, 143.3dB DC gain, a 6.804 MHz unity-gain bandwidth, a 33.7 V/μs slew rate, with the chip area of 1.79 × 1.12 mm². The proposed amplifier is well-suited for vehicle electronic applications including precision battery sensing, sensor interfaces, and power device driving.