期刊
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
卷 69, 期 2, 页码 481-494出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2021.3122984
关键词
Calibration; Timing; Impedance; Estimation; Radio frequency; Frequency measurement; Prototypes; Time-interleaved ADC (TI-ADC); timing-skew calibration; reference ADC; correlation-based; pipelined SAR
资金
- Tsinghua Initiative Scientific Research Program [2018Z05JZY020]
This paper introduces an improved correlation-based timing-skew calibration strategy by implementing a TI-RADC and aligning the sampling edges of TI-ADC and TI-RADC. The proposed technique effectively suppresses spurs resulting from time-variant input impedance and achieves high SNDR and low power consumption.
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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