期刊
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
卷 -, 期 -, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2023.3303217
关键词
Input buffer; analog-to-digital converter; dis-tortion; split-ADC-like calibration; CMOS analog integrated circuits
This paper presents a 12-bit, 1-GS/s SAR-assisted pipeline ADC with background distortion and split-ADC-like gain calibrations. The ADC uses calibration to tackle distortion and achieve adequate linearity. A low-cost auxiliary channel is introduced for reference and gain calibration. The digital post-distortion filter coefficients are optimized using a multi-step multi-layer LMS algorithm. The calibrated ADC achieves high SNDR and SFDR with low power consumption.
A 12-bit, 1-GS/s SAR-assisted pipeline ADC with background distortion and split-ADC-like gain calibrations is presented. The ADC includes an input buffer where its distortion is tackled by calibration. A low-cost auxiliary channel is introduced that serves as a reference for the calibration. It employs only a quarter of the input swing of the main channel, thus achieving adequate linearity. The auxiliary channel is further utilized for the gain calibration, where a split-ADC-like calibration is proposed to ease residue amplifier design constraint. The coefficients in the digital post-distortion filter are iterated through a multi-step multi-layer LMS algorithm, which converges faster and is more robust than its single-step counterpart. The buffered ADC works under a 1 V power supply thanks to the calibration, consuming 19.2 mW, where the input buffer contributes 18% of the total power. The calibration improves the SFDR by >14 dB within the 1st Nyquist zone, and >8dB up to 4th Nyquist input zone. The design achieves 59.3 dB SNDR and 67.1 dB SFDR at Nyquist input. The entire calibration converges within 1 x 10(5) iterations.
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