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An Ultra Low-power Low-offset Double-tail Comparator
, Article 17th IEEE International New Circuits and Systems Conference, NEWCAS 2019, 23 June 2019 through 26 June 2019 ; 2019 ; 9781728110318 (ISBN) ; Saeidi, R ; Sharifkhani, M ; Taherinejad, N ; Cadence; FAB - Mixed-Signal Foundry Experts; Infineon ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
In double tail comparators, the pre-amplifier amplifies the input differential voltage and when the output Vcm of the pre-amplifier becomes larger than Vth of the latch input transistors, the latch is activated and finalizes the comparison. As a result, the pre-amplification delay is fixed to a value and cannot be set at the minimum required delay, to save power and improve offset. In fact, when the latch is activated the pre-amplifier output differential voltage is still growing but the latch finishes the comparison before the maximum differential gain is formed and applied to the latch. In this paper, a comparator is proposed in which the preamplifier is turned off when the maximum gain is...