A 2.6nW, 0.5V, 52dB-DR, 4th-order Gm-C BPF: Moving closer to the FoM´s fundamental limit

A nano-power 4^th-order band-pass filter operating from a 0.5 V supply voltage with an adjustable center frequency, ranging from 250 Hz to 4 kHz (4 octaves), is presented. The filter is constituted from cascadable 2^nd-order circuit cells that are realized by a network of three transistors and two capacitors comprising only one branch of bias current. As a result of the compact low voltage circuit architecture, a dynamic range of 52 dB is obtained, which leads to best figure of merit achieved among other existing designs.