Chapter 3 Digital circuit Basic structure Electrical behavior
Basic Structure Electrical behavior Chapter 3 Digital circuit
Basic CMos gates Any node must get 1/0 from Ⅴcc/ Gnd by switches Switch is made by mos device
Basic CMOS gates Any node must get 1/0 from Vcc/Gnd by switches Switch is made by MOS device
MOS device D G 0 S D G1 S n+ p B p p B p Switch is controlled by g through electric field On: rp-s is low; Off: Rp-s is high;
MOS device Switch is controlled by G through electric field; On: RD-S is low; Off: RD-S is high;
Two types of mos device PMOS: when g is 0, Switch on when g is i switch off: G-忙PMOs NMOS: when g is 1. switch on when g is 0. Switch off G-C NMOS
PMOS: when G is 0, Switch on; when G is 1, Switch off; NMOS: when G is 1, Switch on; when G is 0, Switch off; Two types of MOS device
CMos inverter VDD VDD XF F=X X-DO-F 10 GRD GRD F: get 1 from PMOS, get 0 from NMOs; When x=1. nmos is on: When x=0. pmos is on Why must be complementary
CMOS inverter F: get 1 from PMOS, get 0 from NMOS; When X=1, NMOS is on; When X=0, PMOS is on; Why must be complementary ?