Electronic Design Automation

2.3. CMOS Logic

In this section we highlight some CMOS circuit design principles. We first review the classic CMOS inverter, with which the major measurements are discussed. The principles are carried over to the design of elementary logic gates and complex circuit blocks. Next, we discuss the design of latches and flip-flops, followed by discussion of some simple circuit optimization techniques.

2.3.1. CMOS inverter and analysis

The CMOS inverter consists of a pair of p-channel and n-channel transistors, as shown in Figure 2.13. Unlike pseudo-nMOS circuits, the p-channel transistor in this CMOS inverter is also a switching device, always in a complement switching state of the n-channel transistor, as shown in the truth table in Figure 2.13 ...