The design of a low-power-integrated potentiostat that measures electric current intended for a Chagas disease detection application is presented. This circuit can generate and measure currents from 1 to 10 μA with a relative error under 5%. The remaining part of the circuit consumes only 1.5 μA. The circuit was designed using the 0.6 μm XC06 technology from the X-FAB, with a total silicon area of 0.24 mm 2 (without pads).

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In this work a new topology for a self-biased current reference, based on an asymmetric bulk-modified MOS (ABM) composite transistor is presented. Two current references based in this technique were designed: a 13.5nA current reference in a 1.5µm CMOS technology, and a 100nA current reference in a 0.18µm CMOS technology. The latter was designed to minimize the temperature dependence of the output current; the result was less than 5% from 0°C to 100°C, which is a very good result in comparison to other reported similar current references.

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