Current measurement circuit and method

A current measurement circuit comprising:

• an operational amplifier including two inputs and an output;
• an input connector for connecting the two inputs across a current-sense resistor;
• a gain control sub-circuit connected to the output and including a switch operable to select a current path from a plurality of current paths;
• and
• a measurement output connected to the gain control sub-circuit for outputting a signal indicating a measured current based on a selected current path, wherein:
• the gain control sub-circuit is configured to select a gain across the operational amplifier,
• the measurement output includes a high-gain measurement output and a low-gain measurement output,
• the gain control sub-circuit includes a first output resistor and a second output resistor connected in series between the output and ground,
• the switch is operable to select a low-gain current path for providing a lower-gain signal on the low-gain measurement output by bypassing the first output resistor and connecting to ground through the second output resistor, and
• the switch is operable to select a high-gain current path for providing a higher-gain signal on the high-gain measurement output by connecting to ground through the first output resistor and the second output resistor.