Patent ID: 6114898
Filing Date: 2000-09-05
Classification: H03K,H04L

Abstract:
An output drive circuit mounted within a semiconductor integrated circuit for providing a connection between semiconductor integrated circuits, said output drive circuit comprising a bias generator for generating a first and a second bias voltage and a first driver, the first driver including:a pair of first field effect transistors of opposite conductivity types having sources connected together at a junction leading to an output terminal and operating as source followers which operate in a push-pull mode,a pair of second field effect transistors of opposite conductivity types having sources connected to gates of the first field effect transistors, respectively, and having gates connected together and connected to a signal input terminal and operating as source followers which drive the gates of the first field effect transistors,a pair of third field effect transistors of opposite conductivity types operating as current sources which feed current to the sources of the second field effect transistors, the current being controlled in accordance with a bias voltage applied to each gate of the third field effect transistors to thereby control an impedance as seen from the output terminal and an offset voltage at the output terminal,and a pair of bias terminals connected to the gates of the pair of third field effect transistors and connected to the bias generator to receive the first and the send bias voltage from the bias generator.