Pass-Transistor Logic
AND gate
NMOS-only switch
VB does not pull up to 2.5V, but 2.5V -VTN Threshold voltage loss causes static power consumption + slower transition
Solution 1: Transmission Gate
Resistance of Transmission Gate
Pass-Transistor Based Multiplexer GND V DD In 1 In 2 SS S S
Transmission Gate XOR
Delay in Transmission Gate Networks
Elmore Delay (Chapter 8)
Delay Optimization
Transmission Gate Full Adder
Solution 2: NMOS Only Logic: Level Restoring Transistor
Level Restoring Transistor
Solution 3: Single Transistor Pass Gate with V T =0
Complimentary Pass Transistor Logic
4 Input NAND in CPL