Discussion
Which of the following design styles provides higher integration density ?
Answer: C
The key's answer is switch transistor logic.
In switch (pass-transistor) logic, MOS transistors are used directly as switches that steer signals, so a function such as a multiplexer or XOR can be built with far fewer transistors than with complementary gate structures. Fewer, smaller devices and less wiring per function give a higher integration density on the chip.
Transistor-transistor logic is a bipolar logic family, and bipolar devices with their resistors take much more area than MOS switches. 'Transistor buffer logic' and 'circuit level logic' are not design styles noted for density.
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