Inthis article an ultra low power analog programmable band-pass filter for cochlear implants (CIs) is designed. In order to decreasethe power consumption, a subthresholdGm-Cstructure is used and also capacitiveattenuationtechnique is added to the filter to enhance the linear range. As reducing the area is one of the most important keysto moving to a fully implanted system,source degeneration and current division techniques are used simultaneity to avoid using large attenuating capacitances, resulting in reduced area. Simulation resultsshows thatin the worst case the designed forth-order filter consumes a power of only 718nW inthe 0.18µm CMOS technology, using asupply voltage of 1.3V.

Keywords