High performance CMOS current-mode precision full-wave rectifier (PFWR)

This paper presents a high performance CMOS current-mode precision full-wave rectifier. The circuit operates under 3V supply voltage and is designed based on an improved Wilson current mirror. All MOS transistors are biased at low current resulting in small power dissipation. Negative feedback has been employed to reduce the input impedance of the circuit (236Ω). HSPICE is used to perform the simulation and the result shows the frequency of operation as high as 100 MHz with a standard 0.5 μm CMOS technology. The mismatch obtained from the input and rectifier´s output is 0.21% for an input current of ±150μA. The DC transfer characteristic shows good linearity, very sharp corner at zero crossing point and good symmetry during positive and negative input cycle while power dissipation is 5.8μW.