Design of minimally invasive all-pole analog lowpass filters

In this paper, a new design technique for designing higher order minimally invasive lowpass filters is proposed. The proposed fully differential filter has been simulated in TSMC 130 nm technology for third and fourth orders. When compared with the conventional filter implementations such as a Tow-Thomas architecture, the proposed third order solution achieves a total in-band input-referred integrated noise of (44.09,upmu V) compared to (78.83,upmu V), achieved by a Tow-Thomas implementation. The proposed solution offers higher tolerance to blockers along with lesser number of active devices required. Though, the total capacitance used is increased from 23.82 pF to 89.82 pF, from third order Tow-Thomas filter to its minimally invasive filter counterpart, the power consumption reduces by (77,%) from third order Tow-Thomas to the third order minimally invasive filter.