A 40-nm CMOS 7-b 32-GS/s SAR ADC With Background Channel Mismatch Calibration
- Authors
- Jo, Dong-Shin; Sung, Ba-Ro-Saim; Seo, Min-Jae; Kim, Woo-Cheol; Ryu, Seung-Tak
- Issue Date
- Apr-2020
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Calibration; Clocks; Delays; Circuits and systems; Multiplexing; Prototypes; Analog-to-digital converter (ADC); time-interleaving; massive; successive approximation register (SAR); input buffer; offset; skew; calibration; DLL; phase-detector (PD)
- Citation
- IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, v.67, no.4, pp.610 - 614
- Journal Title
- IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
- Volume
- 67
- Number
- 4
- Start Page
- 610
- End Page
- 614
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/83650
- DOI
- 10.1109/TCSII.2019.2916913
- ISSN
- 1549-7747
- Abstract
- This brief presents a 7-b 32-GS/s successive approximation register analog-to-digital converter (ADC) using a massive time-interleaving (TI) architecture. For low-skew multi-phase clocks, generation utilizing a delay-locked loop (DLL) phase-detector (PD) with a reduced offset is proposed to minimize skew between the clocks. Different clock path delays caused by distributed sub-ADCs over a large area in a massive TI-ADC are compensated for by multiplexing master clocks from the DLL. Offsets and skews in the sub-channels are calibrated on chip in the background via an additional dedicated sub-channel. A prototype chip was implemented in a 40-nm CMOS process with an active area of 0.36 mm(2). The measured SFDR and SNDR of the prototype ADC at a conversion rate of 32 GS/s are 43.1 and 31.4 dB, respectively. The ADC, including the input buffers, consumes 125 mW under a single 0.9-V supply.
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