Active intelligent termination

Abstract From the Canadian patent

An active intelligent termination circuit is designed to function as a self-switching clamp adapted to attenuate unwanted signals on a data bus. A field effect transistor is switched on or off in a conducting mode or non-conducting mode respectively in accordance with the data transmitted on the data bus. Any low level unwanted signals which may appear on the bus when data having a voltage level corresponding to a logic zero is present will be attenuated by the field effect transistor which is coupled to both the data bus and to a ground plane. The field effect transistor switches to the non-conducting mode when data corresponding to a logic level one is transmitted on the bus.