Ultra high-speed switching transistor

A graded base vhf transistor has now been developed specifically for computer applications and will shortly be placed in production. This transistor typically has a use time of nine light feet, a storage time of five light feet, and a fall time less than six light feet at a circuit gain of 10. At these speeds the unit is readily driven into saturation with saturation voltages the order of a tenth of a volt. This performance is necessarily obtained only in a structure wherein be customary intrinsic region has been eliminated. Several processing refinements required to bring about this geometry at high yield have been achieved and will be described together with a discussion of control of the important switching parameters.