Low-power baseband filter for zero-intermediate frequency digital video broadcasting terrestrial/handheld receivers

Digital video broadcasting terrestrial (DVB-T) is being adopted by many countries all over the world. Recently, DVB-H, a new standard compatible with DVB-T, has been proposed for handheld terminals, which demands low power consumption. In this study, a continuous-time filter for DVB-T/H receivers is presented. High linearity and low noise are achieved by selecting a Gm-C filter topology implemented with a novel programmable transconductor based on MOS transistors in the triode region. The filter is tunable in a wide range, which makes it suitable for VLSI integration. The filter has been designed in a standard 0.5 m CMOS technology with a single 3.3 V supply voltage. Experimental results show an IM3 of 58 dB for a two tone experiment with 2 Vpp output signal centred at 2 MHz.