Design of Two-Stage Operation Amplifier Circuit Based on Low Power Consuption
Yuze Liu · Advances in engineering research/Advances in Engineering Research · 2025
Portable low-power design has gained increasing significance due to user demands for fragmented usage scenarios and the pursuit of energy efficiency, environmental sustainability, and extended battery life.The two-stage operational amplifier (OPAMP) circuit, characterized by high gain, low power consumption, and moderate bandwidth, plays a pivotal role in portable lowpower systems.The two-stage operational amplifier circuits, due to their inherent characteristics aligning with the demands of low-power portable devices and their superior performance compared to conventional op-amp configurations, have been increasingly adopted in the design of various low-power portable electronic systems.This circuit architecture comprises a differential amplification stage followed by a common-source amplification stage.The input signal is preliminarily amplified through the differential stage and subsequently undergoes secondary amplification via the common-source stage, thereby achieving high gain.To stabilize the gain and ensure sufficient phase margin, a Miller compensation capacitor is inserted between the input and output terminals of the common-source stage.The proposed design demonstrates high-gain signal amplification under ultralow power constraints.