In PCB design, a hierarchical schematic (also known as a block diagram) breaks down a large, complex circuit into smaller, manageable modules or blocks on a top-level sheet. Each module represents a specific function or subsystem of the circuit, such as power supply, signal processing, or communication interface,and links to a detailed schematic sheet for that module. This approach promotes modularity and reusability.
The top-level sheet, or top sheet, provides the high-level overview of the circuit, showing the relationships between different functional modules.
Each module on the top sheet represents a separate schematic sheet containing the detailed design of that specific module. You can further nest modules within other modules, creating a hierarchy of schematics.