A 97.7-dB DR 12.3-μW 1-kHz Bandwidth 2<SUP>nd</SUP> Order Delta-sigma Modulator with a Fully Differential Class-AB Op-Amp using Floating Class-AB Control
IF 0.5 4区 工程技术Q4 ENGINEERING, ELECTRICAL & ELECTRONIC
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引用次数: 0
Abstract
This paper presents a 2SUPnd/SUP order modified feed-forward (FF) delta-sigma modulator. To reduce power consumption, the proposed analog-to-digital converter (ADC) adopts a class-AB op-amp for the first integrator since it shows an enhanced slew rate with low quiescent current. In addition, a 4-bit asynchronous successive approximation register (SAR) ADC which exhibits low power consumption is employed as a quantizer. A delay is incorporated into the feedback path for stable operation of the feedback loop. The prototype ADC is fabricated in a 28 nm CMOS process, and the core area is 0.095 mm2. It consumes 12.3 μW from 0.8 V (Analog)/0.85 V (Digital) supply voltages at an operating clock frequency of 512 kHz with an oversampling ratio (OSR) of 256. It achieves a dynamic range (DR) of 97.7 dB and a peak signal-to-noise and distortion ratio (SNDR) of 94.8 dB, corresponding to a Schreier figure-of-merit (FoM) of 176.8 dB.
期刊介绍:
Journal of Semiconductor Technology and Science is published to provide a forum for R&D people involved in every aspect of the integrated circuit technology, i.e., VLSI fabrication process technology, VLSI device technology, VLSI circuit design and other novel applications of this mass production technology. When IC was invented, these people worked together in one place. However, as the field of IC expanded, our individual knowledge became narrower, creating different branches in the technical society, which has made it more difficult to communicate as a whole. The fisherman, however, always knows that he can capture more fish at the border where warm and cold-water meet. Thus, we decided to go backwards gathering people involved in all VLSI technology in one place.