Digital Electronics: Principles, Devices and Applications

Logic Gates and Related Devices 93Figure 4.34Complementary gates.ABCDYEFGH(a)ABCDYEFGH(b)Figure 4.35 Example 4.11.Example 4.12Refer to Fig. 4.36(a). If the NAND gate used has the transfer characteristics of Fig. 4.36(b), sketch theexpected output waveform.SolutionThe output waveform is shown in Fig. 4.36(c). The output is initially in logic ‘1’ state. It goes fromlogic ‘1’ to logic ‘0’ state as the input exceeds 2 V. The output goes from logic ‘0’ to logic ‘1’ stateas the input drops below 1 V.