nmos/pmos transistors can be used in a configuration where voltage on gate can be think in terms of control or valve to pass water (electric current analogue) between terminals of transistor, pass-transistors logic concepts are discussed. How pass transistors are different than conventional CMOS logic circuits, advantages, disadvantages of pass-transistor logic are discussed with examples of logic gates circuits.
Pass-transistor logic circuits offer lower power circuits, lesser transistors and lesser area. However one needs to be careful in cascading the pass transistors and often output voltage scaling is required at circuit outputs using pass-transistors.
For conventional CMOS logic circuit design and layout, please watch:
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