PCBSchemaGen: Reward-Guided LLM Code Synthesis for Printed Circuit Boards (PCB) Schematic Design with Structured Verification

PCBSchemaGen is a novel framework that enables the synthesis of PCB schematics using a frozen 31B parameter LLM (Gemma-4-31B) by employing a structured verification approach. It integrates a domain schema derived from IC datasheets with a 5-layer continuous-reward verifier for pin-level error localization, achieving an average pass rate of 81.3% on 227 real-IC tasks across multiple circuit domains. This framework's ability to refine LLM outputs in the absence of traditional unit-test oracles presents a significant advancement for practitioners working on code synthesis in specialized areas like PCB design.