An Investigation of Op-Amp Circuit Optimization Based on Monte Carlo Simulation and PVT Simulation
Bojiang Zhang, Zixuan Guo, Xinyang Yu, Xing Che, Jiahao Xue · 2024
This paper focuses on the investigation of op amp circuit optimization based on Monte Carlo simulation and PVT simulation, focusing on the performance of the op amp in different operating environments and its optimization method of key performance indexes. First, the performance of the op amp under different conditions is evaluated through pre-simulation and post-simulation performance analysis. Then, the performance under various combinations of process variables is statistically analyzed using Monte Carlo simulation, and the performance indexes such as gain bandwidth product (GBW), common mode rejection ratio (CMRR), and power supply rejection ratio (PSRR) are examined during the study, and the corresponding optimization strategies are given. Then, the selection of the op-amp structure is analyzed, and the design optimization of the current reference and bias circuits is further carried out. Through mathematical modeling and small-signal analysis, this paper proposes a method to optimize the design of the current source, thus improving the bandwidth and stability of the op amp. In addition, the study utilizes small-signal model-based gain and bandwidth calculations, voltage-swing ratio analysis, and power supply rejection ratio calculations. Finally, through design and simulation optimization, the op-amp design proposed in this paper meets the design specifications in most cases and shows high stability and performance advantages under different conditions.