CIRCUIT FOR TRANSFERRING HIGH VOLTAGE VIDEO SIGNAL WITHOUT SIGNAL LOSS

摘要

A circuit (202; 204) for transferring high voltage analog video signals while enabling the use of conventional low voltage logic levels includes a first transistor (308; 308') powered by a high voltage power source to bias a pass transistor (114; 124) at a high voltage level. The pass transistor receives a high voltage video signal and because of the high voltage bias is able to pass the video signal without attenuation of the signal due to feedthrough effects, thus preserving the fidelity of the video signal. A second transistor (304; 304') provides a ground potential which operates to turn OFF the pass transistor, thus disabling the transfer of the video signal therethrough. A third transistor (306; 306') operatively coupled to the first transistor operates to turn OFF the first transistor when the second transistor is in operation.