Sorry, I've meant analog circuitry, which I've read again and again about on CPUs - see below as one example. And it was also mentioned in some articles about the IO die on Zen 2.

> Intel’s analog designers are responsible for creating circuits such as PLLs (for clocking) and PCIe (for I/O) that are critical for modern SoCs on a process that isn’t optimized for analog

https://www.realworldtech.com/intel-22ffl-process/