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相关概念视频

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

1.6K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

858
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
858
IR Spectrometers01:25

IR Spectrometers

1.1K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
1.1K
IR Spectrum01:19

IR Spectrum

999
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
999
Operational Amplifiers01:17

Operational Amplifiers

949
The operational amplifier, often referred to as an op-amp, is a multifaceted building block of a circuit. This electronic component functions like a voltage-controlled voltage source and can also be used to create a voltage- or current-controlled current source. The design of an operational amplifier enables it to execute mathematical operations when external components like resistors and capacitors are linked to its terminals. An op-amp has the capacity to sum signals, amplify a signal,...
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相关实验视频

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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一个14位的混合模拟到数字转换器用于红外焦平面阵列的数字读取集成电路集成电路.

Douming Hu1, Libin Yao1, Nan Chen1

  • 1Kunming Institute of Physics, Kunming 650223, China.

Sensors (Basel, Switzerland)
|June 19, 2024
PubMed
概括

本研究介绍了用于红外焦平面阵列的14位混合模拟数字转换器 (ADC),提高了功率和速度. 这种新的设计结合了连续近似寄存器 (SAR) 和单斜坡 (SS) ADC,以实现高效,高性能的数字成像.

关键词:
一个干燥的世界.这是一个SAR ADC.这是SS ADC的SS ADC.这是一个混合ADC.红外 FPA 是一个红外 FPA.

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相关实验视频

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科学领域:

  • 电气工程 电气工程
  • 混合信号集成电路混合信号集成电路
  • 传感器技术 传感器技术

背景情况:

  • 数字红外焦平面阵列 (IRFPA) 需要高性能模拟数字转换器 (ADC) 进行准确的成像.
  • 现有的ADC经常面临电力消耗和速度的限制,阻碍了紧的,高分辨率的IRFPA的开发.
  • 在多位ADC中,对于降低电容计数和放松匹配要求的高效量子化技术的需求至关重要.

研究的目的:

  • 为数字IRFPAs设计了一种新的14位混合列平行ADC.
  • 为解决IRFPAs现有的ADC架构中的功率和速度妥协问题.
  • 为了减少单元电容器的数量,并放松电容器阵列匹配,以提高小像素距 IRFPA 的可制造性.

主要方法:

  • 一个双相混合ADC架构,结合了7位连续近似寄存器 (SAR) ADC用于粗量化和7位单倾斜 (SS) ADC用于细量化.
  • 为粗量化阶段实施一个分段的温度计编码数字对模拟转换器 (DAC) 的权衡.
  • 在SAR和SS ADC之间共享DAC和比较器模拟电路,以最大限度地减少功耗和布局面积.

主要成果:

  • 实现了 -0.61/+0.84 LSB的差异非线性 (DNL) 和120 kS/s的采样速率.
  • 在77K时显示的时间噪声为1.7LSBrms,信号噪声和扭曲比率 (SNDR) 为72.9dB,有效位数 (ENOB) 为11.82位.
  • 混合ADC采用180纳米CMOS工艺制造,其总功耗为71μW.

结论:

  • 拟议的14位混合ADC有效地提高了数字IRFPA的功率和速度性能.
  • 混合架构和细分DAC有助于改进线性和放松电容匹配,从而实现非校准.
  • 这种设计为先进的IRFPA提供了紧且节能的解决方案,特别是具有小像素距离的IRFPA.