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A low-power low-offset charge-sharing technique for double-tail comparators

Khorami, A ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.mejo.2020.104842
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. A charge sharing technique for high-speed double-tail comparators is presented. This technique is applied to the pre-amplifier stage of the dynamic comparators so that the maximum differential gain is applied to the latch during the latching process reducing the input referred offset voltage. In dynamic comparators a large portion of the input referred offset voltage is coming from the latch, and the proposed technique is introduced to alleviate this issue. Monte- Carlo simulations show that the proposed technique reduces the offset voltage from 16 mV to 8 mV. Due to the charge sharing technique, the pre-amplifier draws just enough power for its operation reducing the average power by 40% compared to the conventional comparator. Therefore, the proposed charge sharing technique considerably reduces the offset voltage and power consumption while the speed is better in the whole range of the input common mode voltage. © 2020 Elsevier Ltd
  6. Keywords:
  7. Low-power ; Pre-amplifier ; Comparator circuits ; Comparators (optical) ; Differential amplifiers ; Intelligent systems ; Average power ; Charge sharing ; Common mode voltage ; Differential gain ; Dynamic comparators ; High Speed ; Input referred offset voltage ; Offset voltage ; Monte Carlo methods
  8. Source: Microelectronics Journal ; Volume 102 , August , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0026269219309383