An output circuit according to the present invention comprises an input terminal, first and second MOS transistors of a same conductivity type connected in series between first and second power supplies to form a current path, and alternately turned on in response to an input signal from the input terminal,...http://www.google.com/patents/US5552723?utm_source=gb-gplus-sharePatent US5552723 - CMOS output circuit compensating for back-gate bias effects
