A 70–280 MHz frequency and Q tunable 53 dB SFDR Gm-C filter for ultra-wideband

A 70-280 MHz 5th-order Chebyshev Gm-C low-pass filter was implemented in 0.13μm CMOS process to support both WiMedia UWB and lower rate IR-UWB applications. The filter response is accurately maintained over 4× frequency range by using unit Gm cell arrays and independent Q tuning circuit. To improve linearity of Gm-C filter in low supply voltage, a modified LC ladder topology is proposed. The IIP3 performance is improved more than 10 dB compared to conventional Gm-C filter. A measured spurious free dynamic range (SFDR) of more than 50 dB is maintained when the filter cut-off frequency is programmed. It occupies an area of 0.12 mm
²
and consumes 21 mW under supply of 1.5 V.