Dynamic range

About: Dynamic range is a research topic. Over the lifetime, 7576 publications have been published within this topic receiving 101739 citations. The topic is also known as: DNR & DR.

High-resolution current sensor utilizing nanocrystalline alloy and magnetoelectric laminate composite.

Abstract: A self-powered currentsensor consisting of the magnetostrictive/piezoelectric laminatecomposite and the high-permeability nanocrystalline alloys is presented. The induced vortexmagnetic flux is concentrated and amplified by using an optimized-shape nanocrystalline alloy of FeCuNbSiB into the magnetoelectric laminatecomposite; this optimization allows improving the sensitivity significantly as well as increasing the saturation of the currentsensor. The main advantages of this currentsensor are its large dynamic range and ability to measurecurrents accurately. An analytical expression for the relationship between current and voltage is derived by using the magnetic circuit principle, which predicts the measured sensitivity well. The experimental results exhibit an approximately linear relationship between the electric current and the induced voltage. The dynamic range of this sensor is from 0.01 A to 150 A, and a small electric current step-change of 0.01 A can be clearly distinguished at the power-line frequency of 50 Hz. We demonstrate that the currentsensor has a flat operational frequency in the range of 1 Hz–20 kHz relative to a conventional induction coil. The currentsensor indicates great potentials for monitoring conditions of electrical facilities in practical applications due to the large dynamic range, linear sensitivity, wide bandwidth frequency response, and good time stability.

High-performance optical analog link using external modulator

Abstract: An experimental fiber-optic analog link with a noise figure of only 6-dB, a 104-dB intermodulation-free dynamic range (measured using a 10-Hz noise bandwidth), and an RF-to-RF gain of 11 dB at 50 MHz is discussed. The link includes no electronic amplification. It uses a very sensitive bandpass impedance-matched Ti:LiNbO/sub 3/ interferometric modulator and an input optical power of 55 mW at 1.32 mu m. >

Multimode delta-E effect magnetic field sensors with adapted electrodes

Abstract: We present an analytical and experimental study on low-noise piezoelectric thin film resonators that utilize the delta-E effect of a magnetostrictive layer to measure magnetic fields at low frequencies. Calculations from a physical model of the electromechanical resonator enable electrode designs to efficiently operate in the first and second transversal bending modes. As predicted by our calculations, the adapted electrode design improves the sensitivity by a factor of 6 and reduces the dynamic range of the sensor output by 16 dB, which significantly eases the requirements on readout electronics. Magnetic measurements show a bandwidth of 100 Hz at a noise level of about 100 pTHz−0.5.

Third order sigma delta oversampled analog-to-digital converter network with low component sensitivity

Abstract: An improved modulator network for an interpolative oversampled (sigma-delta) analog-to-digital converter comprises a second-order modulator, which performs double integration of error between its digital output signal and its analog input signal, and a first-order modulator, which performs single integration of error between its digital output signal and an analog signal supplied thereto from the second-order modulator. The modulators supply their output signals to a digital error cancellation circuit which suppresses in the signal supplied to a decimation filter the quantization noise arising in the second-order modulator. The network exhibits significantly reduced sensitivity to the practical nonidealities that normally limit the resolution of analog-to-digital converters of this type, i.e., component matching, amplifier nonlinearity, finite gain, settling time, and signal dynamic range.