In an earlier post, NAND and NOR gate using CMOS Technology, we have seen the implementation of 2 input NAND and NOR gate using CMOS technology. In this article, we will discuss how to implement 2 input AND and OR gate using CMOS technology.
Generally in our academic curriculum, students are taught AND and OR gate first, and then to get NAND and NOR gate, INVERTER is added as shown in Figure 1.
Figure 1
However, in CMOS technology, NAND and NOR gates are considered to be the basic gates, and then INVERTER is added to get AND and OR gate as shown in Figure 2.
Figure 2
So, we will add CMOS INVERTER to the NAND and NOR implementations as shown here to get AND and OR implementations. The explanation for output voltage for different input voltage levels can be referred from the same NAND and NOR article. The only addition is an INVERTER, so the final output will be inverted.
2 Input AND Gate
TRUTH TABLE
CIRCUIT
2 input CMOS AND gate
2 Input OR Gate
TRUTH TABLE
CIRCUIT
2 input CMOS OR gate