TY - GEN
T1 - A 13b SAR ADC with eye-opening VCO based comparator
AU - Yoshioka, Kentaro
AU - Ishikuro, Hiroki
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2014/10/31
Y1 - 2014/10/31
N2 - A low-power and high accuracy comparator based on voltage controlled ring-oscillator (VCO) is presented. By using the dead zone of phase detector effectively, the VCO comparator automatically changes its noise level depending on the input voltage level (Δvin). When Δvin is large, the comparator operates as a low-power delay-line based comparator. On the other hand, when Δvin is small, the VCO is enabled and eye is opened during the oscillation. This suppress input referred noise and enables accurate conversion. The number of oscillation cycle for one comparison is inversely proportional to Δvin and adaptive noise reduction is realized. The VCO comparator does not require any sort of tuning. A 13b SAR ADC with proposed VCO based comparator was fabricated in 65-nm CMOS. By off-chip LMS calibration, the ADC achieves SNDR 66 dB at 1 MS/s with FoM of 29fJ/conv.-step.
AB - A low-power and high accuracy comparator based on voltage controlled ring-oscillator (VCO) is presented. By using the dead zone of phase detector effectively, the VCO comparator automatically changes its noise level depending on the input voltage level (Δvin). When Δvin is large, the comparator operates as a low-power delay-line based comparator. On the other hand, when Δvin is small, the VCO is enabled and eye is opened during the oscillation. This suppress input referred noise and enables accurate conversion. The number of oscillation cycle for one comparison is inversely proportional to Δvin and adaptive noise reduction is realized. The VCO comparator does not require any sort of tuning. A 13b SAR ADC with proposed VCO based comparator was fabricated in 65-nm CMOS. By off-chip LMS calibration, the ADC achieves SNDR 66 dB at 1 MS/s with FoM of 29fJ/conv.-step.
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U2 - 10.1109/ESSCIRC.2014.6942109
DO - 10.1109/ESSCIRC.2014.6942109
M3 - Conference contribution
AN - SCOPUS:84909977218
T3 - European Solid-State Circuits Conference
SP - 411
EP - 414
BT - ESSCIRC 2014 - Proceedings of the 40th European Solid-State Circuit Conference
A2 - Andreani, Pietro
A2 - Bevilacqua, Andrea
A2 - Meneghesso, Gaudenzio
PB - IEEE Computer Society
T2 - 40th European Solid-State Circuit Conference, ESSCIRC 2014
Y2 - 22 September 2014 through 26 September 2014
ER -