Standard CMOS, pass-transistor logic, and dynamic logic each have advantages and

Question

Standard CMOS, pass-transistor logic, and dynamic logic each have advantages and disadvantages. Which of the following is/are not true in comparing these logic styles? A. Dynamic logic is the most robust circuit style. B. Standard CMOS is best suited to complex circuits with many inputs. C.VOH is significantly lower than V_DD in pass.transistor logic D. Some logic functions can be implemented with fewer transistors in pass- transistor logic. E. The area can be smaller for pass-transistor logic. F. Dynamic logic does not have a pull-up network.

Explanation / Answer

A. True

The noise margin of dynamic circuits is less as compare to Static CMOS Logic as well as leakage is less in case of static cmos.

B. False

Because the robustness of the circuit decreases as no. of transistors increases which leads to increase in parasitic capacitance at output node.

C. True

Because in pass transistor logic the VOH is VDD - Vtn and the value of Vtn is quite significant in Upper technology.

D. True

Because in pass transistor logic pull up circuitry is not present hence transistor count gets reduced.

E. True

As the transistor count is less, hence area required is also less for implementation of this logic.

F. True

It just has 1 precharge PMOS transistor and no other Pull up circuitry.

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