CMOS analog current-mode multiplier based on the advanced compact MOSFET model

This work presents a four-quadrant current-mode CMOS multiplier structure based on the advanced compact MOSFET (ACM) model. Contrary to most traditional approaches for implementing CMOS multipliers, the proposed configuration is valid in the whole inversion regime of the MOS transistor, providing wide input range and improved linearity. The main theoretical principle of our multiplier lies on the quadratic relationship between the forward saturation component of drain current and source transconductance, according to the ACM model. A current signal is converted into source transconductance through a device operating in the linear region and this transconductance is mirrored to another device operating in saturation. The proposed architecture is compared with other current mode circuits regarding some performance features, such as linearity, harmonic distortion, dynamic input range and mismatch sensitivity.