Buffered ion sense current source in an ignition coil

This invention relates generally to ionization detection in an ignition system and more particularly to ionization detection in an ignition system using a buffered ionization sensing current source. In an ignition coil assembly of an ion sensing ignition system having an ignition coil output, a buffered ion-sense current source circuit is provided and includes a current sensing circuit, the current sensing circuit being disposed so as to be communicated with the ignition coil output and an active current source circuit, the active current source circuit being disposed so as to be communicated with the current sensing circuit and a current measuring device.