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Purely analog circuits, including those with digital functions as an ancillary feature, are never on the latest process node. Analog functions don’t scale down well, high drive currents or voltage support require minimum feature sizes. The notable increase per node in terms of frequency support would be wasted even on parts operating up to the gigahertz range. Even the most aggressive analog circuits, like current RF-CMOS designs, are only released when the node is a few generations old. The process control required to get them functional within usable tolerances for analog circuits like current mirrors and differential pairs is greater than what digital designs demand