Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
Volume 68, Issue 7, Pages 2675-2679Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSII.2021.3059164
Keywords
Dynamic comparator; fully-synthesizable; ultra-low voltage; ultra-low power; sensor nodes; Internet of Things
Categories
Funding
- Singapore National Research Foundation [NRF-CRP20-2017-0003]
- European Union [703988]
- Marie Curie Actions (MSCA) [703988] Funding Source: Marie Curie Actions (MSCA)
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The ultra-low voltage, ultra-low power rail-to-rail dynamic voltage comparator is solely based on digital standard cells, allowing for operation at very low voltages down to deep sub-threshold. The circuit has demonstrated correct operation at a supply voltage ranging from 0.6V down to 0.15V, with a delay lower than 442 μs (10pW) at the latter voltage. Its input offset voltage is less than 30mV over the entire rail-to-rail common-mode input and supply range, making it suitable for direct powering from mm-scale harvesters.
An ultra-low voltage, ultra-low power rail-to-rail dynamic voltage comparator solely based on digital standard cells is presented. Thanks to its digital nature, the comparator can be designed and integrated with fully-automated digital design flows and can operate at very low voltages down to deep sub-threshold. Measurements on an 180nm testchip show correct operation under rail-to-rail common-mode input at a supply voltage ranging from 0.6V down to 0.15V. The comparator delay (power) is lower than 442 mu s (10pW) at 0.15-V supply voltage. The input offset voltage is less than 30mV over the entire rail-to-rail common-mode input and supply range. The minimum supply voltage and power are the lowest reported to date, and make the circuit suitable for direct powering from mm-scale harvesters.
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