A 10-bit 300 MS/s 5.8 mW SAR ADC With Two-Stage Interpolation for PET Imaging

作者：Qiu, Lei; Wang, Keping^*; Tang, Kai; Siek, Liter; Zheng, Yuanjin

来源：IEEE Sensors Journal, 2018, 18(5): 2006-2014.

DOI：10.1109/JSEN.2018.2790581

• 2b/cycle
• background offset calibration
• interpolation
• SAR ADCs
• medical imaging

In this paper, a high speed low power 26/cycle successive approximation register (SAR) analog-to-digital converter (ADC) is proposed for medical imaging. The ADC adopts a two-stage differential pair based interpolation technique that can reduce resolution of the capacitive DAC and avoid usage of smaller unit capacitor. A meta-stability immunity technique is proposed to enhance the asynchronous conversion. A design example of 10-bit 2b/cycle SAR ADC with sampling rate up to 300 MS/s is fabricated. Dissipating 5.8 mW with 1.2 V supply and occupying an active area of 0.082 mm(2), the measured SFDR and SNDR at Nyquist input are 59-dB and 51.5-dB respectively. It achieves an effective resolution bandwidth of 360 MHz and a figure-of-merit of 61 fJ/conve rsio n-step.

• 出版日期2018-3-1
• 单位南阳理工学院; 东南大学