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Frequency response

About: Frequency response is a research topic. Over the lifetime, 25705 publications have been published within this topic receiving 332249 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, a simple four-transistor, linear, tunable, high-frequency transconductance element is described, which achieves its linearity by current differencing without undue matching requirements.
Abstract: A simple four-transistor, linear, tunable, high-frequency transconductance element is described. By using a pair of composite n -channel- p -channel devices, the circuit achieves its linearity by current differencing without undue matching requirements. It is shown that linearity and frequency response can be optimized simultaneously by appropriate choice of device dimensions. The performance is verified by SPICE simulations, and an operational transconductance amplifier (OTA) is used as one example for the many applications of the proposed element.

112 citations

Patent
16 Sep 2010
TL;DR: In this paper, an ultrasonic system consisting of an elongated member and a resonator was provided to impart ultrasonic energy to tissue and a generator to supply power to the resonator of the ultrasonic device.
Abstract: An ultrasonic system is provided that includes an ultrasonic device having an elongated member configured to impart ultrasonic energy to tissue and a resonator configured to impart a frequency to the elongated member. The system also includes an ultrasonic generator configured to supply power to the resonator of the ultrasonic device. The ultrasonic generator has a drive signal generator configured to provide a drive signal, a noise signal generator configure to provide a noise signal, and a controller. The controller receives an output signal from the ultrasonic device and the noise signal from the noise signal generator, calculates a transfer function based on the output signal and the noise signal, and adjusts the drive signal generator based on the calculated transfer function.

111 citations

Journal ArticleDOI
TL;DR: In this article, a two-dimensional periodic solid structure with embedded inertial amplification mechanisms can possess a wide and deep phononic gap at low frequencies, and the width and depth of the induced phononic gaps (stop bands) are determined both analytically using a distributed parameter model and numerically using one-dimensional (1D) and 2D finite element models.

111 citations

Journal ArticleDOI
TL;DR: In this article, the authors proposed a novel four-degrees-of-freedom (DOF) nonresonant micromachined gyroscope design concept based on utilizing dynamical amplification both in the 2DOF drive-direction oscillator and the 2-DOF sense direction oscillator to achieve large oscillation amplitudes without resonance.
Abstract: This paper reports a novel four-degrees-of-freedom (DOF) nonresonant micromachined gyroscope design concept that addresses two major MEMS gyroscope design challenges: eliminating the mode-matching requirement and minimizing instability and drift due to mechanical coupling between the drive and sense modes. The proposed approach is based on utilizing dynamical amplification both in the 2-DOF drive-direction oscillator and the 2-DOF sense-direction oscillator, which are structurally decoupled, to achieve large oscillation amplitudes without resonance. The overall 4-DOF dynamical system is composed of three proof masses, where second and third masses form the 2-DOF sense-direction oscillator, and the first mass and the combination of the second and third masses form the 2-DOF drive-direction oscillator. The frequency responses of the drive and sense direction oscillators have two resonant peaks and a flat region between the peaks. The device is nominally operated in the flat regions of the response curves belonging to the drive and sense direction oscillators, where the gain is less sensitive to frequency fluctuations. This is achieved by designing the drive and sense anti-resonance frequencies to match. Consequently, by utilizing dynamical amplification in the decoupled 2-DOF oscillators, increased bandwidth and reduced sensitivity to structural and thermal parameter fluctuations and damping changes are achieved, leading to improved robustness and long-term stability over the operating time of the device.

111 citations

Journal ArticleDOI
TL;DR: In this paper, the problem of computing the frequency response of linear systems with parametric perturbation is addressed, and the results are useful in determining the H∞ norm, gain margin and phase margin and in improving the diagonal dominance of uncertain systems.

111 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023154
2022389
2021857
20201,105
20191,212
20181,152