A 150 mV, Sub-1 nW, 0.75%-Full-Scale INL Delta-Sigma ADC for Power-Autonomous Sensor Nodes

Measured performances of a Delta Sigma ADC prototype operating down to 150 mV supply show 600 pW consumption while being able to convert dc signals with INL<0.75
^%
of input full scale. The modulator shows an SNDR of 59.3 dB over a bandwidth of 0.3 Hz and 17 Hz at a supply voltage of 0.15 V and 0.3 V, respectively. Dc characterizations over a set of 5 samples between 0.18 V and 0.3 V supply range show consistent and repeatable offset (<0.51% of full scale) and integral non-linearity (<1.45% of full scale). Such performances candidate the proposed ADC for its use in ultra-low voltage, low sampling rate, power-autonomous sensor nodes.