Low voltage LC-ladder Gm-C low-pass filters with 42-215 MHz tunable range

In this paper we report 3/sup rd/-order G/sub m/-C filters based on fully-balanced pseudo-differential continuous-time transconductors for applications in low-voltage systems over VHF range. By using a 0.35 /spl mu/m standard CMOS process, two low-pass filter approximations (Butterworth and Elliptic) have been implemented with a cut-off frequency programmability from 42 to 215 MHz, which confirm the feasibility of the proposed strategy in applications such as data storage systems and IF strips. The filters consume less than 3.8 mW from a 2 V supply. The measured dynamic range was 53 dB at THD of 1%. The estimated active area of the filter is 0.074 mm/sup 2/.