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A 4–10 bit, 0.4–1 V Power Supply, Power Scalable Asynchronous SAR-ADC in 40 nm-CMOS with Wide Supply Voltage Range SAR Controller
Akira SHIKATA Ryota SEKIMOTO Kentaro YOSHIOKA Tadahiro KURODA Hiroki ISHIKURO
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/02/01
Online ISSN: 1745-1337
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
analog-to-digital converter, successive approximation, asynchronous, differential flip-flop,
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This paper presents a wide range in supply voltage, resolution, and sampling rate asynchronous successive approximation register (SAR) analog-to-digital converter (ADC). The proposed differential flip-flop in SAR logic and high efficiency wide range delay element extend the flexibility of speed and resolution tradeoff. The ADC fabricated in 40 nm CMOS process covers 4–10 bit resolution and 0.4–1 V power supply range. The ADC achieved 49.8 dB SNDR and the peak FoM of 3.4 fJ/conv. with 160 kS/sec at 0.4 V single power supply voltage. At 10 bit mode and 1 V operation, up to 10 MS/s, the FoM is below 10 fJ/conv. while keeping ENOB of 8.7 bit.