Journal ArticleDOI
Study of capacitance nonlinearity in nano-scale multi-stage MOSFET-only sigma-delta modulators
TLDR
The effect of MOS capacitance nonlinearity on the overall performance of discrete-time sigma-delta modulators is investigated, and a behavioral-level model of a MOSFET-only switched-capacitor (SC) integrator is proposed, and enables characterizing the transfer behavior of MFA-only modulators.Abstract:
Digital integrated circuits (ICs) can be integrated in low-cost digital CMOS technologies with less number of masks than a mixed-signal CMOS technology. This property, however, limits the access to reliable analog components such as linear capacitors and linear inductors. Regardless of the CMOS process, sigma-delta (ΣΔ) modulation of analog signals can be fulfilled by using ordinary MOS devices as capacitors. Called as MOS capacitors (MOSCAPs), these elements illustrate nonlinear C-V characteristic, although the thin gate oxide layer results a high capacitance per unit area. In this article, we investigate the effect of MOS capacitance nonlinearity on the overall performance of discrete-time sigma-delta modulators. To this end, a behavioral-level model of a MOSFET-only switched-capacitor (SC) integrator is proposed, and enables characterizing the transfer behavior of MOSFET-only modulators. The proposed model is used to analyze the linearity and to select a suitable architecture for the modulator. It helps to decide proper structure of each MOSCAP depending on its significance on the output linearity. In virtue of the new model, behavioral-level simulation of a 1-V 12-bit 20MS/s MOSFET-only 2 + 2 sturdy MASH (SMASH) modulator matches well to circuit-level simulations in 90-nm digital CMOS technology. For a −1.4 dB, 19.7 kHz input and an oversampling ratio of 16, the modulator achieves over 72 dB signal-to-noise plus distortion ratio (SNDR), only 3 dB lower than a conventional design based on linear metal-insulator-metal (MIM) capacitors.read more
Citations
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Journal ArticleDOI
All–MOS self-powered subthreshold voltage reference with enhanced line regulation
TL;DR: In this article, a self-powered voltage reference configuration was developed for the integrated microsystems in standard CMOS technology, which can be made very insensitive to the power supply glitches originating from the simple regulation mechanisms used to harvest energy from the environment.
Journal ArticleDOI
Global impedance attenuation network for multistage OTAs driving a broad range of load capacitor
Journal ArticleDOI
A Low-Power Delta-Sigma Capacitance-to-Digital Converter for Capacitive Sensors
TL;DR: This paper proposes a low-power delta–sigma capacitance-to-digital converter (CDC) for a capacitive sensor that employs a zoomed-in technique with the offset capacitor to extend the input capacitance range and an auto-zeroing technique is used in the OTAs to reduce their offset and noise.
Journal ArticleDOI
Embedding Two P+ Pockets in the Buried Oxide of Nano Silicon on Insulator MOSFETs: Controlled Short Channel Effects and Electric Field
Zahra Aghaeipour,Ali Naderi +1 more
TL;DR: In this paper, the authors proposed an efficient structure for nanoscale silicon on insulator (SOI) MOSFETs, where two P+ pockets are considered in buried oxide, a pocket under source region and another under channel.
Journal ArticleDOI
A broadband DC-coupling 16 GS/s sample-and-hold amplifier in 0.13 μm SiGe BiCMOS process
TL;DR: In this paper, a broadband DC-coupling master-slave sample-and-hold amplifier (SHA) was proposed for high-speed broadband analog-to-digital converter used in microwave and optical communication.
References
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Book
Understanding Delta-Sigma Data Converters
TL;DR: This chapter discusses the design and simulation of delta-sigma modulator systems, and some of the considerations for implementation considerations for [Delta][Sigma] ADCs.
Journal ArticleDOI
Behavioral modeling of switched-capacitor sigma-delta modulators
Piero Malcovati,S. Brigati,F. Francesconi,Franco Maloberti,Paolo Cusinato,Andrea Baschirotto +5 more
TL;DR: This paper presents a complete set of blocks implemented in the popular MATLAB SIMULINK environment, which allows designers to perform time-domain behavioral simulations of switched-capacitor sigma-delta (/spl Sigma//spl Delta/) modulators.
Journal ArticleDOI
A 1.8-V digital-audio sigma-delta modulator in 0.8-/spl mu/m CMOS
Shahriar Rabii,Bruce A. Wooley +1 more
TL;DR: In this article, the design and implementation of a CMOS /spl Sigma/spl Delta/ modulator for digital-audio A/D conversion that operates from a single 1.8-V power supply is examined.