Multi Board System Design -

| Configuration | Description | Applications | |---------------|-------------|--------------| | Parallel stacked | Boards separated by standoffs | Raspberry Pi + HAT | | Orthogonal (mother-daughter) | Daughtercard perpendicular | PCIe cards | | Coplanar | Boards side-by-side on chassis | ATX power supply + motherboard | | Backplane | All boards vertical, horizontal backplane | Telecom chassis |

Abstract — As electronic systems grow in complexity, single-board solutions often become impractical due to physical, thermal, power, or modularity constraints. Multi-board systems distribute functionality across interconnected printed circuit boards (PCBs). This paper presents a comprehensive methodology for designing multi-board electronic systems, covering architectural partitioning, connector selection, signal integrity, power distribution, mechanical considerations, and design for manufacturing (DFM). Practical guidelines for minimizing noise, managing heat, and ensuring reliability are provided. 1. Introduction A multi-board system consists of two or more PCBs electrically and mechanically integrated to perform a unified function. Common examples include blade servers, modular synthesizers, automotive ECU stacks, and baseband + radio boards in smartphones. multi board system design

| Domain | Typical Board Assignment | |--------|--------------------------| | High-speed digital (CPU, DDR) | Central processor board | | Analog front-end (ADC, op-amps) | Separate analog board | | Power regulation (buck/boost converters) | Power board or backplane | | User I/O (USB, Ethernet, display) | Interface carrier board | | High voltage / safety isolation | Dedicated isolated board | Common examples include blade servers