Secure signal integrity

A computer system comprising a circuit board, the circuit board comprising:

• a secure portion, the secure portion comprising a protected circuit operable for storing security relevant data, and a secure portion power-supply element;
• a non-secure portion comprising an unprotected circuit and a non-secure portion power-supply element corresponding to the secure portion power-supply element;
• wherein the secure portion and non-secure portion are separated by an isolation gap;
• a coupling element bridging the isolation gap between the secure portion and the non-secure portion, the coupling element electrically connected to the secure portion power-supply element within the secure portion and electrically connected to the non-secure portion power-supply element;
• and
• non-secure portion ground traces routed in the secure portion and connected to secure circuit common ground traces.

A computer system comprising a circuit board, the circuit board comprising:

• a secure portion, the secure portion comprising a protected circuit operable for storing security relevant data, and a secure portion power-supply element;
• a non-secure portion comprising an unprotected circuit and a non-secure portion power-supply element corresponding to the secure portion power-supply element;
• wherein the secure portion power-supply element and non-secure portion power-supply element are separated by an isolation gap;
• an AC coupling element disposed in electrical communication with the secure portion power-supply element within the secure portion, and in electrical communication with the non-secure portion power-supply element within the secure portion, the AC coupling element electrically conductive to an alternating current portion of a signal carried upon the power-supply elements;
• a DC coupling element disposed in electrical communication with the secure portion power-supply element within the secure portion and in electrical communication with the non-secure portion power-supply element within the non-secure portion, the DC coupling element electrically conductive to a direct current portion of a signal carried upon the power-supply elements;
• and
• non-secure portion ground traces routed in the secure portion and connected to secure circuit common ground traces.