A 50 Mhz 5/sup TH/ order elliptic LP-filter using current mode Gm-C topology

A 50 Mhz 5th order elliptic LP-filter with current mode Gm-C topology has been designed for 0.5 /spl mu/m CMOS process and 3.3 V supply voltage. A low distortion level has been achieved by using dynamic biasing as a linearization principle. In order to further reduce the level of distortion, scaling for minimum distortion has been done. The effect of poles caused by parasitic capacitances has been canceled with phase lag compensation resistances realized with transistors biased in the saturation region in order to achieve high adjustability. With this topology the level of third order harmonic approximately -55 dBc with 500 /spl mu/A/sub pp/ input current has been achieved. The simulated dynamic range of the filter is 60 dB and it has power dissipation of 91 mW.