US Patent 11099032 Drive sense circuit with drive-sense line

A drive-sense circuit includes a signal source circuit and a signal change detection circuit. The signal source circuit is operably coupled to a sensor. When enabled, the signal source circuit provides a signal to the sensor. When the sensor is exposed to a condition, an electrical characteristic of the sensor affects the signal, which includes a DC component and/or an oscillating component. When enabled, the signal change detection circuit is operably coupled to detect an effect on the signal as a result of the electrical characteristic of the sensor. The signal change detection circuit is further operable to generate a signal representative of change to the signal based on the detected effect on the signal.