New low-voltage fully-balanced wide-band differential CMOS current amplifier

This paper presents a new low-voltage fully balanced wide-band differential CMOS current amplifier. The number of transistors between the power and ground rails is minimum so that the minimum supply voltage is needed. The circuit is fully balanced such that the effect of bias-induced mismatches is eliminated. In addition, a differential configuration is employed to minimize the fluctuation of the power and ground caused by the switching of the digital portion of mixed-mode circuits. A new differential negative current-current feedback mechanism is introduced to lower the input impedance and increase the bandwidth. The proposed amplifier is implemented in a 0.18 /spl mu/m 1.8 V CMOS process and analyzed using SPICE. The results are presented.