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A 14-Bit Split-Pipeline ADC With Self-Adjusted Opamp-Sharing Duty-Cycle and Bias Current
Mao, Jiaji; Guo, Mingqiang; Sin, Sai-Weng; Martins, Rui Paulo
2018-10
Conference NameIEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
Volume65
Issue10
Pages1380-1384
Publication Place445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
PublisherIEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
AbstractPipeline analog-to-digital converters (ADCs), which dominated high-speed and high-resolution applications, suffered from weak improvement in power efficiency. To address such a problem, this brief presents a 14-bit split-pipeline opamp-sharing ADC, with background calibration that optimizes duty-cycle ratio and amplifier power consumption in the shared opamp. Based on the interstage gain (that includes settling) error estimated by the split ADC calibration engine, the clock duty-cycle ratio and the bias current are adjusted to achieve better dynamic settling and resolution trade-offs. Operating at 100 MS/s with a 9-MHz input signal, the ADC achieves 46.5 dB of signal-to-noise-and-distortion ratio (SNDR) and 59.6 dB of spurious-free dynamic range (SFDR) before calibration, and after calibration, it improves to 71.7 dB of SNDR and 84.4 dB of SFDR, respectively. The ADC maintains an SNDR over 68.5 dB within the full Nyquist bandwidth consuming 32 mW of power, which yields a Walden figure-of-merit (FoM) of 147.2 fJ/conversion-step and a Schreier FoM of 160.4 dB.
KeywordAnalog-to-digital conversion digital background calibration pipelined ADC split ADC opamp-sharing technique
DOI10.1109/TCSII.2018.2851944
URLView the original
Indexed BySCI ; CPCI
Language英语
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000446155600020
The Source to ArticleWOS
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Document TypeConference paper
CollectionUniversity of Macau
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Mao, Jiaji,Guo, Mingqiang,Sin, Sai-Weng,et al. A 14-Bit Split-Pipeline ADC With Self-Adjusted Opamp-Sharing Duty-Cycle and Bias Current[C]. 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC,2018:1380-1384.
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