. . . "It should be noted that in system 271 D1 sets the threshold and blocks negative inputs, D2 shunts negative inputs, Q1 is an input inverter transistor, Q2 simulates an EP1 FET, Q3 serves as an output inverter and first Q in the CBT, Q4A and Q4B serve as the second Q in the CBT, Q5 serves as the third Q in the CBT and the predriver, Q6 serves as the fourth Q in the CBT and the driver, Q7 serves as t" .