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A continuous‐time (CT) ΣΔ modulator for sensing and direct analog‐to‐digital conversion of nA‐range (subthreshold) currents is presented in this work. The presented modulator uses a subthreshold technique based on subthreshold source‐coupled logic cells to efficiently convert subthreshold current to digital code without performing current‐to‐voltage conversion. As a benefit of this technique, the...
A micro-watt power subthreshold current modulator suitable for low-power and low-noise sensor interfaces is presented. The prototype design is based on Subthreshold Source Coupled Logic (STSCL) cells and implemented in a 0.18 μπι standard CMOS technology. The modulator operates with the supply voltage of 0.8 V which is significantly lower than the nominal supply of the technology node (1.8 V). It...
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