How Secure Are Analog Circuits?

Multi-die assemblies enable more analog content, but that adds new security vulnerabilities for which there is little available research.

By Ed Sperling, Semi Engineering | June 5, 2025

The move toward multi-die assemblies and the increasing value of sensor data at the edge are beginning to focus attention and raise questions about security in analog circuits.

In most SoC designs today, security is almost entirely a digital concern. Security requirements in digital circuits are well understood, particularly in large data centers and at the upper end of edge computing, which are dominated by digital computing. This is largely a function of limited on-chip real estate, because analog doesn’t scale. Even mixed-signal IP has become progressively more digital so it can fit into a smaller space. But as the industry shifts from planar SoCs to multi-dimensional, heterogeneous systems-in-package (SiPs, including 2.5D, 3D, and 3.5D), those area restrictions have loosened up.

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