Pass-transistor logic and its sub-Vdd voltage-swing behaviours in low-voltage circuit design

Internal signal propagation with voltage swing less than the supply voltage have been proposed through various architecture or structures. Reduced supply voltage in digital and analog circuits is considered to be one of the best methods for achieving real low power dissipation circuits. In this paper, pass-transistor logic with suppressed internal voltage-swing is investigated and analyzed. A proposal on a reduced swing 14-bit parity generator and carry generation blocks of a parallel full adder are also given. In addition, optimization on propagation delay can be achieved by proper tapering of the dimension of the transistors.