Patent attributes
A drive-sense circuit coupled to a variable current load. The drive-sense circuit includes an impedance reference circuit operable to generate an impedance reference signal. The drive-sense circuit further includes a regulated voltage source circuit operable to generate a regulated voltage signal based on an analog regulation signal, where the regulated voltage signal is provided on a line to the variable current load to keep a load impedance on the line substantially matching the impedance reference signal, and where a current of the variable current load affects the regulated voltage signal. The drive-sense circuit further includes a voltage loop correction circuit operable to generate a comparison signal based on the impedance reference signal and the load impedance, where the comparison signal represents the current, and where the analog regulation signal is representative of the comparison signal.