Efficient real-time modelling of substrate coupling in large mixed-signal Spice designs, using analogue HDL

In large mixed-signal circuits, digitally-injected substrate noise has recently been recognised as a key problem for circuit designers. However, no published procedure exists which allows circuit designers to efficiently model the substrate noise and coupling to the analogue circuitry in large mixed-signal Spice designs. Such a methodology is presented and is extended to employ novel analogue HDL (hardware description language) models, providing real-time capability. The efficiency and practicality of the proposed methodology are demonstrated in two example circuits.