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A chopper ripple-free circuit with input noise density of 37 nV/√Hz is presented. The CMOS scheme chops the input and demodulates the result after amplification with CDS. Offset temperature dependence is better than 0.03 μV/°C. The analog current consumption is 12.8 μA with supplies ranging from 1.8 V to 5 V. The noise efficiency factor is 5.5.
This paper presents the design of an adaptive hysteretic comparator optimized for noisy environment. It features an input rail-to-rail opamp which uses feedback networks to set varying hysteretic thresholds while maintaining a constant hysteretic band for increased noise immunity and stability. The chip which can resolve up to 9 bits consumes a total power of 3.8 mW and takes an active area of 0.021...
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