TY - GEN
T1 - A 500 kS/s 71.8 dB 5.7 fJ/Conv-step Switch Supply Based Comparator SAR ADC for Biomedical Portable Devices
AU - Venkatesh, Madhan
AU - Salgado, Gerardo Molina
AU - McCarthy, Kevin G.
AU - O'Connell, Ivan
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - This paper introduces a switch supply dynamic comparator that, by means of a reservoir capacitor, exhibits a reduced effective supply voltage during the decision phase without requiring a dedicated DC-DC down converter, pin, or external supply rail. The proposed switch supply comparator achieves a 28% reduction in power consumption compared to the conventional dynamic comparator design. An ultra-low-power 14-bit SAR ADC is implemented using the proposed switch supply comparator, where the bootstrap switch is also replaced with a clock-boosting switch, enabling further power consumption reduction without compromising the achievable SNDR. The ADC was fabricated in 65 nm CMOS and consumes 9.14 μW from a 1 V supply and achieves a constant SNDR of 71.7 dB from DC to 0.5 MS/s. The resulting resolution, speed and state of the art Walden FoM of 5.7 fJ/Conv make this ADC suitable for low-power portable biomedical devices.
AB - This paper introduces a switch supply dynamic comparator that, by means of a reservoir capacitor, exhibits a reduced effective supply voltage during the decision phase without requiring a dedicated DC-DC down converter, pin, or external supply rail. The proposed switch supply comparator achieves a 28% reduction in power consumption compared to the conventional dynamic comparator design. An ultra-low-power 14-bit SAR ADC is implemented using the proposed switch supply comparator, where the bootstrap switch is also replaced with a clock-boosting switch, enabling further power consumption reduction without compromising the achievable SNDR. The ADC was fabricated in 65 nm CMOS and consumes 9.14 μW from a 1 V supply and achieves a constant SNDR of 71.7 dB from DC to 0.5 MS/s. The resulting resolution, speed and state of the art Walden FoM of 5.7 fJ/Conv make this ADC suitable for low-power portable biomedical devices.
KW - clock boosting circuit
KW - Custom MoM Capacitor
KW - SAR ADC
KW - split array CDAC
KW - switch supply comparator
UR - https://www.scopus.com/pages/publications/85184978053
U2 - 10.1109/BioCAS58349.2023.10388868
DO - 10.1109/BioCAS58349.2023.10388868
M3 - Conference proceeding
AN - SCOPUS:85184978053
T3 - BioCAS 2023 - 2023 IEEE Biomedical Circuits and Systems Conference, Conference Proceedings
BT - BioCAS 2023 - 2023 IEEE Biomedical Circuits and Systems Conference, Conference Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2023 IEEE Biomedical Circuits and Systems Conference, BioCAS 2023
Y2 - 19 October 2023 through 21 October 2023
ER -