Comment by hn3er1q
6 hours ago
I just remembered your article on the standard cells of Pentium and there you noted bicmos was used by some gates for a reduction in propagation delay in some instances. Were any of the gates in the adder structures bicmos?
No, the adder was all CMOS. But there are some BiCMOS drivers visible at the bottom of one of the photos. The NPN transistors are big squares, unlike the CMOS transistors.