歪斜
校准
采样(信号处理)
逐次逼近ADC
无杂散动态范围
电子工程
计算机科学
探测器
电容器
物理
电压
工程类
CMOS芯片
电信
量子力学
作者
Meng Ni,Xiao Wang,Fule Li,Woogeun Rhee,Zhihua Wang
出处
期刊:IEEE Transactions on Circuits and Systems I-regular Papers
[Institute of Electrical and Electronics Engineers]
日期:2022-02-01
卷期号:69 (2): 481-494
被引量:9
标识
DOI:10.1109/tcsi.2021.3122984
摘要
This paper presents an improved correlation-based timing-skew calibration strategy with constant input impedance characteristics. A full sampling rate operating time-interleaved reference ADC (TI-RADC) whose interleaving factor is coprime with TI-ADC is introduced to replace the conventional single-channel reference ADC. This paper theoretically demonstrates that by setting an appropriate time interval between the sampling edge of TI-ADC and TI-RADC and aligning the sampling edge of each channel in TI-ADC with each other but not with the reference ADC, the skew of the TI-RADC would not affect the timing skew calibration of the TI-ADC. A prototype 13-bit 2-GS/s 8-way TI pipelined SAR ADC employing a 1-bit 3-way TI-RADC is fabricated in 28-nm process to verify the presented calibration strategy. Measurement results demonstrate the correctness of the calibration strategy and reveal that compared with using single-channel reference ADC operating at a decimated sampling rate, the spurs resulting from the time-variant input impedance are suppressed more than 20 dB. The prototype ADC achieves an SNDR of 60.36 dB with a near Nyquist rate input when operating at 2-GS/s. The power consumption of the prototype ADCis 252.6 mW (Including the 4.1 mW estimated digital calibration), which translates into a Walden FoM of 148.3-fJ/conversion-step.
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