Automatic current ranging system

A method of measuring current, comprising:

• measuring, by each of a plurality of parallel sensing circuits, a respective range of voltage corresponding to a current through a load, wherein each sensing circuit is triggered to initiate measurement of a voltage across the load or the current through the load in response to a buffer voltage or a buffer current on a common buffer reaching a respective threshold;
• inputting, by a buffer circuit, a virtual ground voltage or a virtual ground current corresponding to the voltage across the load or the current through the load to the plurality of parallel sensing circuits;
• and
• combining, by a processor coupled to the plurality of parallel sensing circuits, data representing voltage measurements from the plurality of parallel sensing circuits to determine the current through the load.

A method for testing operation of an electronic device, comprising:

• measuring, by each of a plurality of parallel sensing circuits, a respective range of voltage corresponding to a current through the electronic device, wherein each sensing circuit is triggered to initiate measurement of a voltage across the electronic device in response to a buffer current through a common buffer reaching a respective threshold;
• inputting, by a buffer circuit, a virtual ground voltage or a virtual ground current to the electronic device and to the plurality of parallel sensing circuits, the virtual ground current corresponding to the voltage across the electronic device or the current through the electronic device;
• combining, by a processor coupled to the plurality of parallel sensing circuits, data representing voltage measurements from the plurality of parallel sensing circuits to determine the current through the electronic device;
• and
• analyzing the current to determine if the operation of the electronic device passes meets predetermined criteria.