A low-frequency, sub 1.5-V micropower G/sub m/-C filter based on subthreshold MIFG MOS transistors

Abstract

We present a sub-1.5V and micropower filter with very low and tunable cut off frequency. It consists of low-G/sub m/ and wide-linear-range OTA using subthreshold MIFG (multiple input floating gate) MOS transistors. A linearization technique based on cancellation of cubic distortion term is implemented. The filter designed in a 0.8-/spl mu/m CMOS process can operate under a supply voltage V/sub dd/ as low as 1.2V. For V/sub dd/ = 1.5V, the filter has a linear range of 1.1 Vpp (with THD < 1%) and a tuning range from 0.5 to 200Hz, with power dissipation below 2/spl mu/W.