Low power chip-scale CPT atomic clock with new microwave frequency modulation technique

2014 ◽  
Author(s):  
Xing Cheng ◽  
Zhang Yaolin ◽  
Wu Jiutao ◽  
Zhao Jianye
Keyword(s):  
Low Power ◽  
Frequency Modulation ◽  
Atomic Clock ◽  
Microwave Frequency ◽  
Modulation Technique

Hybrid periodic carrier frequency modulation technique based on modified SVPWM to reduce the PWM noise

2019 ◽  
Vol 12 (3) ◽  
pp. 515-520 ◽  
Author(s):  
Yingliang Huang ◽  
Yongxiang Xu ◽  
Wentao Zhang ◽  
Jibin Zou
Keyword(s):  
Frequency Modulation ◽  
Carrier Frequency ◽  
Modulation Technique

Pulse width modulation technique with harmonic injection in the modulating wave and discontinuous frequency modulation for the carrier wave to reduce vibrations in asynchronous machines

2019 ◽  
Vol 12 (11) ◽  
pp. 2865-2872 ◽  
Author(s):  
Antonio Ruiz‐Gonzalez ◽  
Mario Meco‐Gutierrez ◽  
Juan‐Ramon Heredia‐Larrubia ◽  
Francisco Perez‐Hidalgo ◽  
Francisco Vargas‐Merino
Keyword(s):  
Frequency Modulation ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Carrier Wave ◽  
Modulation Technique ◽  
Asynchronous Machines ◽  
Harmonic Injection

scholarly journals High-Precision Acceleration Measurement System Based on Tunnel Magneto-Resistance Effect

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1117 ◽  
Author(s):  
Lu Gao ◽  
Fang Chen ◽  
Yingfei Yao ◽  
Dacheng Xu
Keyword(s):  
Magnetic Field ◽  
High Precision ◽  
Measurement System ◽  
Frequency Modulation ◽  
High Frequency ◽  
Low Noise ◽  
Acceleration Measurement ◽  
Field Source ◽  
Modulation Technique ◽  
Magneto Resistance

A high-precision acceleration measurement system based on an ultra-sensitive tunnel magneto-resistance (TMR) sensor is presented in this paper. A “force–magnetic–electric” coupling structure that converts an input acceleration into a change in magnetic field around the TMR sensor is designed. In such a structure, a micro-cantilever is integrated with a magnetic field source on its tip. Under an acceleration, the mechanical displacement of the cantilever causes a change in the spatial magnetic field sensed by the TMR sensor. The TMR sensor is constructed with a Wheatstone bridge structure to achieve an enhanced sensitivity. Meanwhile, a low-noise differential circuit is developed for the proposed system to further improve the precision of the measured acceleration. The experimental results show that the micro-system achieves a measurement resolution of 19 μg/√Hz at 1 Hz, a scale factor of 191 mV/g within a range of ± 2 g, and a bias instability of 38 μg (Allan variance). The noise sources of the proposed system are thoroughly investigated, which shows that low-frequency 1/f noise is the dominant noise source. We propose to use a high-frequency modulation technique to suppress the 1/f noise effectively. Measurement results show that the 1/f noise is suppressed about 8.6-fold at 1 Hz and the proposed system resolution can be improved to 2.2 μg/√Hz theoretically with this high-frequency modulation technique.

scholarly journals Synthesis of Resonance by Nonlinear Distortion Methods

2013 ◽  
Vol 37 (1) ◽  
pp. 35-43
Author(s):  
Victor Lazzarini ◽  
Joseph Timoney
Keyword(s):  
Frequency Modulation ◽  
Nonlinear Distortion ◽  
Sound Synthesis ◽  
Classic Case ◽  
Modulation Technique ◽  
Formant Synthesis ◽  
Resonator Model ◽  
Made In

This article explores techniques for synthesizing resonant sounds using the principle of nonlinear distortion. These methods can be grouped under the heading of “subtractive synthesis without filters,” the case for which has been made in the literature. Starting with a simple resonator model, this article looks at how the source-modifier arrangement can be reconstructed as a heterodyne structure made of a sinusoidal carrier and a complex modulator. From this, we examine how the modulator signal can be created with nonlinear distortion methods, looking at the classic case of phase-aligned formant synthesis and then our own modified frequency-modulation technique. The article concludes with some application examples of this sound-synthesis principle.

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