CMOS Interface To CNT Sensor Arrays

The interface chip attains a large dynamic range using an ADC and DAC of lower dynamic range and an automatic gain control. The sensor interface chip is designed in a 0.18µm CMOS process and consumes, at maximum, 32 µW at 1.83 kS/s conversion rate. The designed interface achieves 1.34% measurement accuracy over 10 kOhm - 9 MOhm dynamic range. The power consumption of the chip can be linearly scaled using duty-cycling.