70 MHz CMOS gm-C IF filter

Abstract

The implementation of a high dynamic range on-chip 70 MHz gm-C filter for a UMTS (WCDMA) superheterodyne receiver is described. The filter is designed in National Semiconductor's 0.18 micron standard CMOS process. The Chebyshev approximation is used to implement a 6th order filter in active gm-C. Positive feedback is used to realize a large quality factor (Q). The filter provides blocker attenuation with dynamic range (DR) of 42 dB and with power consumption of 21.78 mW.