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‐impedance capacitive divider probe for potential measurements in plasmas

Abstract: It is often desirable, though difficult, to measure electric potential changes within a plasma, including variations due to waves and fluctuations. For a broad range of plasma parameters ac floating potential measurements may be made using the high input impedance probe described in this paper. A capacitive divider with an active buffer circuit is incorporated, such that a 50‐Ω line can be driven with a 60‐dB dynamic range and 100‐MHz bandwidth. Details of the electronic circuit, mechanical construction, and calibration of the probe are given, together with a discussion of the parameter range over which successful measurements may be made.

A fully differential charge-balanced accelerometer for Electronic Stability Control

Abstract: An accelerometer for electronic stability control utilizes a two-mass mechanical sensor element to implement a fully-differential signal path, achieving robustness against electromagnetic interference (EMI) without the need for external shielding in the package. The EMI rejection is augmented further with a pseudo-random chopping scheme, which spreads the interference over a wide bandwidth, reducing its in-band portion to the level of the noise floor. The chopping function maintains zero-mean voltage waveforms across the sensor electrodes, which is also beneficial for the long-term offset stability of the device. A charge-balanced capacitance-to-voltage converter provides linear transduction for displacements of the proof-mass up to 70% of the gap and minimizes the residual electrostatic forces. A dual-axis design occupies 1.1 mm 2 in 0.18- μm CMOS and consumes 820 μA from an internally regulated 1.9-V supply. The system achieves 380 μg/ √Hz noise floor and 84-dB dynamic range. The offset variation in the automotive temperature range of -40 to +140°C has a 3 σ range of ±11 mg.

Active Structural Acoustic Control with Adaptive Structures Including Wavenumber Considerations

Abstract: The structural acoustic control of a baffled simply supported plate was modeled analytically to determine the feasibility of using the model to design shaped sen sors. Results from the analytical study were compared to those obtained in experiments previously conducted that implemented either microphones or polyvinylidene fluoride (PVDF) strips as error sensors. Since the experimental data was subjected to a 40 dB dynamic range (due to A/D of controller as well as noise floor of instrumentation), the theoretical control approach was modified such that the analytical model would be limited to the same dynamic range. To evaluate the success of the structural acoustic control, radiated sound pressure was measured or computed in an arc perpendicular to the plane of the plate. Analytical predictions for sound radiation before and after control correlated well with the data obtained in the experimental investigation. In an effort to explain the physical mechanism of control, the k-transform of the structural re...

A CMOS 8-Bit 1.6-GS/s DAC With Digital Random Return-to-Zero

Abstract: A digital random return-to-zero technique is presented to improve the dynamic performance of current-steering digital-to-analog converters (DACs). To demonstrate the proposed technique, a CMOS 8-bit 1.6-GS/s DAC was fabricated in a 90-nm CMOS technology. The DAC achieves a spurious-free dynamic range better than 60 dB for a sine-wave input up to 460 MHz and better than 55 dB up to 800 MHz. The DAC consumes 90 mW of power.

Swept optical SSB-SC modulation technique for high-resolution large-dynamic-range static strain measurement using FBG-FP sensors.

Abstract: This Letter presents a static strain demodulation technique for FBG-FP sensors using a suppressed carrier LiNbO3 (LN) optical single sideband (SSB-SC) modulator. A narrow-linewidth tunable laser source is generated by driving the modulator using a linear chirp signal. Then this tunable single-frequency laser is used to interrogate the FBG-FP sensors with the Pound–Drever–Hall (PDH) technique, which is beneficial to eliminate the influence of light intensity fluctuation of the modulator at different tuning frequencies. The static strain is demodulated by calculating the wavelength difference of the PDH signals between the sensing FBG-FP sensor and the reference FBG-FP sensor. As an experimental result using the modulator, the linearity (R2) of the time-frequency response increases from 0.989 to 0.997, and the frequency-swept range (dynamic range) increases from hundreds of MHz to several GHz compared with commercial PZT-tunable lasers. The high-linearity time-wavelength relationship of the modulator is beneficial for improving the strain measurement resolution, as it can solve the problem of the frequency-swept nonlinearity effectively. In the laboratory test, a 0.67 nanostrain static strain resolution, with a 6 GHz dynamic range, is demonstrated.