Abstract

An active-RC channel selection filter for wireless LAN is described whose cut-off frequency is tunable from 6MHz to 20MHz. This frequency tuning range is sufficient to cover from 6MHz to IEEE802.11a (20MHz) including the effect of process, voltage, temperature variations. For wide tuning range, a differential R-2R ladder has been developed which gives widely variable resistance with minimum silicon area. The in-band input third-order intercept point (iIP3) of the filter is 18dBV at the highest gain mode. The input referred noise is 13nV/√Hz at the lowest gain mode. Implemented in a 0.25μm CMOS technology, the filter operates with 2.5V supply voltage, consuming 9mA

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