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.

Highly Linear Broadband Optical Modulator Based on Electro-Optic Polymer

Abstract: In this paper, we present the design, fabrication, and characterization of a traveling-wave directional coupler modulator based on electro-optic polymer, which is able to provide both high linearity and broad bandwidth. The high linearity is realized by introducing Δβ -reversal technique in the two-domain directional coupler. A traveling-wave electrode is designed to function with bandwidth-length product of 302 GHz·cm , by achieving low microwave loss, excellent impedance matching, and velocity matching, as well as smooth electric-field profile transformation. The 3-dB bandwidth of the device is measured to be 10 GHz. The spurious-free dynamic range of 110 dB ±3 Hz2/3 is measured over the modulation frequency range of 2-8 GHz. To the best of our knowledge, such high linearity is first measured at the frequency up to 8 GHz. In addition, a 1 × 2 multimode interference 3-dB splitter, a photobleached refractive index taper, and a quasi-vertical taper are used to reduce the optical insertion loss of the device.

Re-engineering electrochemical biosensors to narrow or extend their useful dynamic range

Abstract: Here we demonstrate two convenient methods to extend and narrow the useful dynamic range of a model electrochemical DNA sensor. We did so by combining DNA probes of different target affinities but with similar specificity on the same electrode. We were able to achieve an extended dynamic response spanning 3 orders of magnitude in target concentration. Using a different strategy we have also narrowed the useful dynamic range of an E-DNA sensor to only an 8-fold range of target concentrations.

A Two-Path Bandpass Modulator for Digital IF Extraction at 20 MHz

Abstract: Oversampled bandpass A/D converters based on sigma-delta modulation can be used to robustly digitize the types of narrowband intermediate frequency (IF) signals that arise in radios and cellular systems. This paper proposes a two- path architecture for a fourth-order, bandpass modulator that is more tolerant of analog circuit limitations at high sampling speeds than conventional implementations based on the use of switched-capacitor biquadratic filters. An experimental prototype employing the two-path topology has been integrated in a 0.6- m, single-poly, triple-metal CMOS technology with capacitors syn- thesized from a stacked metal structure. Two interleaved paths clocked at 40 MHz digitize a 200-kHz bandwidth signal centered at 20 MHz with 75 dB of dynamic range while suppressing the undesired mirror image signal by 42 dB. At low input signal levels, the mixing of spurious tones at dc and /2 with the input appears to degrade the performance of the modulator; out- of-band sinusoidal dither is shown to be an effective means of avoiding this degradation. The experimental modulator dissipates 72 mW from a 3.3-V supply.

Programmable dynamic range receiver with adjustable dynamic range analog to digital converter

Abstract: A programmable dynamic range receiver which provides the requisite level of performance at reduced power consumption. The ΣΔ ADC within the receiver is designed with one or more loops. Each loop provides a predetermined dynamic range performance. The loops can be enabled or disabled based on the required dynamic range and a set of dynamic range thresholds. The ΣΔ ADC is also designed with adjustable bias current. The dynamic range of the ΣΔ ADC varies approximately proportional to the bias current. By adjusting the bias current, the required dynamic range can be provided by the ΣΔ ADC with minimal power consumption. A reference voltage of the ΣΔ ADC can be descreased when high dynamic range is not required, thereby allowing for less bias current in the ΣΔ ADC and supporting circuitry. The dynamic range of the ΣΔ ADC is a also function of the oversampling ratio which is proportional to the sampling frequency. High dynamic range requires a high oversampling ratio. When high dynamic range is not required, the sampling frequency can be lowered.

High dynamic range third-order correlation measurement of picosecond laser pulse shapes

Abstract: A third-order correlation system has been developed, which enables the contrast ratio of high-intensity ultra-short laser pulses to be measured on a single shot, with a dynamic range of better than 108.