An emitter follower or source follower transistor is provided in the channel of a wafer test system between a DUT and a test system controller to enable a low power DUT to drive a test system channel. A bypass resistor is included between the base and emitter of the emitter follower transistor to enable...http://www.google.se/patents/US7977958?utm_source=gb-gplus-sharePatent US7977958 - Bi-directional buffer for interfacing test system channel
