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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TL;DR: In this paper, a 58/spl times/58 pixel CMOS detector array for on-chip amplitude demodulation on all pixels in parallel is presented, where optical signals can be detected at Doppler frequencies of 1 kHz up to 1 MHz, with a dynamic range of 57 dB, and at a pixel readout rate of up to 3 MHz.
Abstract: A 58/spl times/58 pixel CMOS detector array for on-chip amplitude demodulation on all pixels in parallel is presented. Optical signals can be detected at Doppler frequencies of 1 kHz up to 1 MHz, with a dynamic range of 57 dB, and at a pixel readout rate of up to 3 MHz.
38 citations
TL;DR: In this paper, a high resolution Chirp Transform Spectrometer (CTS) was developed for the Stratospheric Observatory For Infrared Astronomy (SOFIA).
Abstract: In this paper, we present the design of a high resolution Chirp Transform Spectrometer (CTS) which is part of the GREAT (German REceiver for Astronomy at Terahertz frequencies) instrument onboard SOFIA, the Stratospheric Observatory For Infrared Astronomy. The new spectrometer will provide unique spectral resolving power and linearity response, since the analog Fourier transform performed by the CTS spectrometer was improved through a new design, that we call “Adaptive Digital Chirp Processor (ADCP)”. The principle behind the ADCP consists on digitally generating the dispersive signal which adapts to the compressor dispersive properties, achieving maximum spectral resolution and higher dynamic range. Excellent test results have been obtained such as a white noise dynamic range of 30 dB, and a spectral resolution (FWHM) of 41.68 kHz which would mean if analyzing signals with the high frequency band receiver on the GREAT instrument (4.7 THz) a spectral resolving power (λ/Δ λ) higher than 108.
38 citations
TL;DR: An integrating CMOS image sensor with a wide dynamic range is described in this paper, where the dynamic range of these pixels is controlled by a user-defined reference voltage that creates a photocurrent-dependent effective integration time.
Abstract: An integrating CMOS image sensor with a wide dynamic range is described. The dynamic range of these pixels is controlled by a user-defined reference voltage that creates a photocurrent-dependent effective integration time. The operation of these pixels and a method of obtaining a well-controlled logarithmic response are both described. Furthermore, described are the results of two alternative methods of correcting the fixed pattern noise in these pixels and measurements of the temporal noise from individual pixels. These results show that with these pixels, it is possible to match the contrast sensitivity of the human visual system.
37 citations
TL;DR: An oversampling bandpass cascaded digital-to-analog converter, including digital FIR and analog semi-digital filtering to reduce out of band quantization noise, has been integrated in 0.25-/spl mu/m CMOS technology.
Abstract: An oversampling bandpass digital-to-analog converter has been designed so as to eliminate the carrier leak and in-band SNR degradation that accompany I and Q channel mismatch in wireless transmitters. The converter combines a cascaded noise-shaping sigma-delta (/spl Sigma//spl Delta/) modulator with digital finite impulse response (FIR) and mixed-signal semi-digital filters that attenuate out-of-band quantization noise. The performance of the converter in the presence of current source mismatch has been improved through the use of bandpass data weighted averaging. An experimental prototype of the converter, integrated in a 0.25-/spl mu/m CMOS technology, provides 83 dB of dynamic range for a 6.25-MHz signal band centered at 50 MHz, and suppresses out-of-band quantization noise by 38 dB.
37 citations
TL;DR: A simple and powerful algorithm to extend the dynamic range of a Shack-Hartmann wave-front sensor by tagging each spot in a special sequence and actually implement measurement of a highly aberrated wave front from nonrotational symmetric optics.
Abstract: We propose a simple and powerful algorithm to extend the dynamic range of a Shack-Hartmann wave-front sensor In a conventional Shack-Hartmann wave-front sensor the dynamic range is limited by the f-number of a lenslet, because the focal spot is required to remain in the area confined by the single lenslet The sorting method proposed here eliminates such a limitation and extends the dynamic range by tagging each spot in a special sequence Since the sorting method is a simple algorithm that does not change the measurement configuration, there is no requirement for extra hardware, multiple measurements, or complicated algorithms We not only present the theory and a calculation example of the sorting method but also actually implement measurement of a highly aberrated wave front from nonrotational symmetric optics
37 citations