CRONuS: Circuit Rapid Optimization with Neural Simulator.

Automation of analog circuit design is highly desirable, yet challenging. Various approaches such as deep reinforcement learning (DRL), genetic algorithms, and Bayesian optimization have been proposed and found to be effective. However, these techniques require a large number of interactions with a real simulator, leading to high computational costs. Therefore, we present a novel DRL method, CRONuS, for automatic analog circuit design that uses a surrogate for the simulator. With the help of the surrogate, our method is capable of augmenting a data set with a conservative reward design for stable policy training, without having to interact with the simulator. Regardless of the type of analog circuit, our experiment demonstrated a more than 5 × improvement in sample efficiency with varying target performance metrics.