Hu, Y.-S.Y.-S.HuLin, K.-Y.K.-Y.LinHSIN-SHU CHEN2020-06-112020-06-112017https://scholars.lib.ntu.edu.tw/handle/123456789/501234This paper presents an energy-efficient 12-bit 200kS/s subranging SAR ADC for multi-touch sensing applications. In order to reduce DAC power consumption, an energy-curve reshape technique is proposed to fit the switching energy curve to the characteristics of Rx signals. An auxiliary polarity quantizer joined with the well-known bottom-plate sampling not only can eliminate the gain mismatch of the subranging architecture but also can be as effective as the top-plate sampling. The ADC low-voltage operation could support the smart wake-up mode in the touch sensing system without using dual reference voltages. A pulse-type self-trigger latch technique is utilized to decrease digital loop power dissipation in the low-voltage environment. This ADC consumes 0.95 μW at 200kS/s under a 0.7V supply in 40nm CMOS technology. It achieves an SNDR of 69.24dB at Nyquist rate and results in an FoM of 2fJ/c.-s. © 2016 IEEE.Analog to digital converter (ADC); low power; smart wake-up; subranging; successive approximation register (SAR); touch sensing[SDGs]SDG7Energy efficiency; Wakes; Analog to digital converters; Low Power; subranging; Successive approximation register; Touch sensing; Wake up; Analog to digital conversionconference paper10.1109/ASSCC.2016.78441572-s2.0-85015202787https://www.scopus.com/inward/record.uri?eid=2-s2.0-85015202787&doi=10.1109%2fASSCC.2016.7844157&partnerID=40&md5=d28e2a7dd83cdd68e0a5c3807960f905