Topic
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.
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19 Mar 2015
TL;DR: This paper presents a discrete-time, fully digital, scan-programmable LDO macro in 0.13μm technology featuring greater than 90% current efficiency across a 50× current range, and 8× improvement in transient response time in response to large load steps.
Abstract: An increasing number of power domains and of power states per domain, as well as decreasing decoupling capacitance per local grid and ultra-wide current dynamic range of digital load circuits (for low power on one end while maintaining performance at another) necessitate the design of high-efficiency, compact on-die voltage regulators providing ultra-fine grained spatio-temporal voltage distribution [1,2]. Digitally implementable linear regulators operated in low-dropout (LDO) mode, based on continuous time or discrete time control, exhibit process and voltage scalability [3-5], thus supplementing their analog counterparts [6].
89 citations
TL;DR: In this article, a proof-of-concept force sensor based on three degree of freedom (DoF) weakly coupled resonators was fabricated using a silicon-on-insulator (SOI) process and electrically tested in 20 μTorr vacuum.
Abstract: A proof-of-concept force sensor based on three degree-of-freedom (DoF) weakly coupled resonators was fabricated using a silicon-on-insulator (SOI) process and electrically tested in 20 μTorr vacuum. Compared to the conventional single resonator force sensor with frequency shift as output, by measuring the amplitude ratio of two of the three resonators, the measured force sensitivity of the 3DoF sensor was 4.9 × 106/N, which was improved by two orders magnitude. A bias stiffness perturbation was applied to avoid mode aliasing effect and improve the linearity of the sensor. The noise floor of the amplitude ratio output of the sensor was theoretically analyzed for the first time, using the transfer function model of the 3DoF weakly coupled resonator system. It was shown based on measurement results that the output noise was mainly due to the thermal–electrical noise of the interface electronics. The output noise spectral density was measured, and agreed well with theoretical estimations. The noise floor of the force sensor output was estimated to be approximately 1.39nN for an assumed 10 Hz bandwidth of the output signal, resulting in a dynamic range of 74.8 dB.
88 citations
05 Feb 1998
TL;DR: A PC-based camera system is described using a single-chip digital cameras that offer system designers fully-digital interfaces, reduced part counts, and low-power dissipation.
Abstract: A digital color camera has been monolithically realized in a standard 0.8-/spl mu/m CMOS technology. The chip integrates a 353/spl times/292 photogate sensor array with a unity-gain column circuit, a hierarchical column multiplexer, a switched-capacitor programmable-gain amplifier, and an 8-b flash analog/digital converter together with digital circuits performing color interpolation, color correction, computation of image statistics, and control functions. The 105-mm/sup 2/ chip produces 24-b RGB video at 30 frames/s. The sensor array achieves a conversion gain of 40 /spl mu/V/electron and a monochrome sensitivity of 7 V/lux/spl middot/s. For a 33-ms exposure time, the camera chip achieves a dynamic range of 65 dB and peak-to-peak fixed pattern noise that is 0.3% of saturation. Digital switching noise coupling into the analog circuits is shown to be data independent and therefore has no effect on image quality. Total power dissipation is less than 200 mW from a 3.3 V supply.
88 citations
TL;DR: In this article, the phase of a general complex-valued wave field from a single diffraction pattern is retrieved using a modulator in its data acquisition, which greatly reduces the dynamic range requirement of the detector and also greatly facilitates the inverse calculation.
Abstract: We report and demonstrate experimentally an approach to retrieving the phase of a general complex-valued wave field from a single diffraction pattern. The approach employs a modulator in its data acquisition, which greatly reduces the dynamic range requirement of the detector and also greatly facilitates the inverse calculation. The new algorithm, involving a nonlinear modulus constraint, is free from ambiguities and robust to noise; it converges rapidly even with a rather loose support constraint. This approach provides a practical solution to coherent imaging with a broad range of radiations and at all wavelengths.
88 citations
TL;DR: A hardware implementation is described which achieves 70 dB spurious-free dynamic range and a bandwidth of 30 kHz and the bandpass to low-pass translation is accomplished by undersampling.
Abstract: Many radio and sonar systems require signal outputs in complex low-pass form. To achieve this, it is possible to use uniform sampling of the bandpass signal, together with computation of the quadrature component by way of a Hilbert transform. The bandpass to low-pass translation is accomplished by undersampling. A hardware implementation is described which achieves 70 dB spurious-free dynamic range and a bandwidth of 30 kHz.
88 citations