CMOS Level circuit analysis

CMOS The circuit is in power consumption 、 It has irreplaceable advantages in anti-interference ability .

CMOS Gate circuit design rules

CMOS The most important part of the circuit is the pull-up network （pull up net） And pull-down network （pull down net）, The internal structures of these two networks are symmetrical and complementary . The pull-up network is full of PMOS tube , The drop-down network is full of NMOS tube , Due to complementarity , The pull-up network and the pull-down network will not be connected at the same time .
CMOS The function of the circuit can be independently determined by the pull-up network or the pull-down network .
When designing, you can first determine the logical expression according to the function , Then select the pull-up network or pull-down network to cut in , Determine according to the expression MOS Series parallel connection of tubes , Then draw one of the networks , Then draw another network according to the principle of symmetry and complementarity , Just ！ And it's done ！

Be careful ：

1. The pull-down network needs to negate the formula as a whole
2. Pull down the network , String and , And for or
3. Pull up the network , String as or , And for the sake of