An alternative to CMOS stacks based on a floating-gate transistor

Complementary metal-oxide semiconductor (CMOS) circuits with wide fan in certainly suffers from the relatively slow response due to the N-channel (NMOS) or P-channel (PMOS) stack. In this paper, a novel circuit that acts as an alternative to CMOS stacks will be presented. The proposed scheme is based on using a voltage divider that has a variable resistor as one of its two resistors. This variable resistor is nothing but a floating-gate MOS transistor (FGMOS) whose control gates are connected to the inputs. The proposed scheme will be simulated using the 45 nm CMOS technology with a power-supply voltage of 1 V. The proposed scheme shows an average time-delay saving when the number of the inputs exceeds 4 and an energy-delay product saving when the number of the inputs exceeds 7.