Small-size MEMS Accelerometer Encapsulated in Vacuum Using Sigma-Delta Modulation
2020 IEEE International Symposium on Inertial Sensors and Systems (INERTIAL), 2020 A vacuum encapsulated MEMS accelerometer using Sigma-Delta modulation is here presented. Three different modulation orders (second, third, and fourth) were implemented in a field-programable gate array (FPGA), enabling flexibility for tuning the loop ...
V. Lima +4 more
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Description of a 2-Bit Adaptive Sigma-Delta Modulation System with Minimized Idle Tones
EURASIP Journal on Advances in Signal Processing, 2007 A 2-bit adaptive sigma delta modulation system that inherently eliminates the idle tones present in conventional and other adaptive sigma delta systems is described.
G. S. Tombras, E. A. Prosalentis
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Long Term Stable Δ-Σ NDIR Technique Based on Temperature Compensation
Applied Sciences, 2019 For a fast and long term stable Non Dispersive Infrared (NDIR) technology of gas concentration measurement, the temperature compensation is required.
Chih-Hsiung Shen, Jun-Hong Yeah
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A selectable-bandwidth 3.5 mW, 0.03 mm(2) self-oscillating Sigma Delta modulator with 71 dB dynamic range at 5 MHz and 65 dB at 10 MHz bandwidth [PDF]
, 2012 In this paper we present a dual-mode third order continuous time Sigma Delta modulator that combines noise shaping and pulse-width-modulation (PWM). In our 0.18 micro-m CMOS prototype chip the clock frequency equals 1 GHz, but the PWM carrier is only ...
Gielen, Georges +3 more
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Nonlinear behaviors of bandpass sigma delta modulators with stable system matrices [PDF]
, 2005 It has been established that a class of bandpass sigma delta modulators (SDMs) may exhibit state space dynamics which are represented by elliptical or fractal patterns confined within trapezoidal regions when the system matrices are marginally stable. In
Ho, Yuk-Fan +3 more
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Second-order sigma-delta modulator in standard cmos technology [PDF]
Serbian Journal of Electrical Engineering, 2004 As a part of wider project sigma-delta modulator was designed. It represents an A/D part of a power meter IC. Requirements imposed were: SNDR and dynamic range > 50 dB for maximum input swing of 250 mV differential at 50 Hz.
Milovanović Dragiša +2 more
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Using a Second Order Sigma-Delta Control to Improve the Performance of Metal-Oxide Gas Sensors [PDF]
, 2018 Controls of surface potential have been proposed to accelerate the time response of MOX gas sensors. These controls use temperature modulations and a feedback loop based on first-order sigma-delta modulators to keep constant the surface potential ...
Domínguez Pumar, Manuel +4 more
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A Miniature Pockels Cell with Novel Electrode Geometry
Sensors, 2009 This paper discusses important elements of the Pockels sensing cell design. A novel electrode geometry is analyzed in order to obtain maximum sensitivity response from Pockels crystals (Bi12GeO20). This neither transversal nor truly longitudinal geometry,
Pedja Mihailovic +2 more
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Effects of a space modulation on the behavior of a 1D alternating Heisenberg spin-1/2 model
, 2011 The effects of a magnetic field ($h$) and a space modulation ($\delta$) on the magnetic properties of a one dimensional antiferromagnetic-ferromagnetic Heisenberg spin-1/2 model have been studied by means of numerical exact diagonalization of finite size
Abouie, Jahanfar, Mahdavifar, Saeed
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Global stability, limit cycles and chaotic behaviors of second order interpolative sigma delta modulators [PDF]
, 2011 It is well known that second order lowpass interpolative sigma delta modulators (SDMs) may suffer from instability and limit cycle problems when the magnitudes of the input signals are at large and at intermediate levels, respectively.
Ho, Yuk-Fan +3 more
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