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首页> 外文学位 >Linear electro-optic conversion of sampled signals for a photonic-assisted analog-to-digital converter.
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Linear electro-optic conversion of sampled signals for a photonic-assisted analog-to-digital converter.

机译：用于光子辅助模数转换器的采样信号的线性电光转换。

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摘要

The speed and capabilities of digital processing continue to improve exponentially. Analog-to-digital (AJD) conversion systems harness this computing power for applications involving signals in the real world. When these real world signals have bandwidths on the order of several tens of gigahertz---as can be the case for photonic and wireless communication, highspeed instrumentation, and wideband radar---suitably fast A/D technologies are needed.; However, conventional electronic A/D systems today are limited to resolutions of 4 to 8 bits for signal bandwidths of up to a few gigahertz. The sources of this limitation include the aperture jitter and relatively low input bandwidth of the front-end sampler. Incorporating a photonic-based sampling system which exploits the low jitter of short-pulse lasers can help overcome such limitations.; We outline one proposed photonic-assisted analog-to-digital converter system. Optical pulses from a mode-locked laser trigger photoconductive switches made from metalsemiconductor-metal devices based on low-temperature grown GaAs. When excited by mode-locked laser pulses, these devices exhibit sampling apertures on the order of a. few picoseconds, thus enabling high-bandwidth sampling. These sampled signals could then be digitized by CMOS circuits. A parallel, time-interleaved architecture would utilize many switch/digitizer channels to increase the aggregate sampling rate of the system.; While the CMOS circuits can be directly solder-bonded to the photoconductive switches, physically separating the circuits from the switches can be advantageous. Reasons include electrical isolation, compact integration of the switches, and improved digital data extraction from the circuits.; This dissertation focuses on the use of optical modulators to optically remote the CMOS circuits from the photoconductive switches. These modulators are based on GaAs/AlGaAs multiple quantum wells incorporated in a p-i-n diode structure. The optical modulators linearly convert the sampled electrical signal to an optical one, thus allowing the circuits to be placed on chips separate from the sampling switches.; We demonstrate the linearity of the modulators, and single-channel conversion speeds on the order of 1 gigasample/second. By flip-chip bonding the sampling switches to the modulators, we find that the linearity of the devices should allow for a resolution of at least ∼3.5 effective-number-of-bits (SNOB) for signals with 20 GHz bandwidth.
机译：数字处理的速度和功能继续呈指数级提高。模数（AJD）转换系统将这种计算能力用于现实世界中涉及信号的应用。当这些现实世界的信号的带宽达到几十GHz时（例如光子和无线通信，高速仪器和宽带雷达的情况），就需要有合适的快速A / D技术。然而，当今的常规电子A / D系统对于高达几千兆赫兹的信号带宽限于4至8位的分辨率。这种限制的来源包括孔径抖动和前端采样器的较低输入带宽。结合利用基于光子的采样系统，该系统利用了短脉冲激光器的低抖动特性，可以帮助克服这些限制。我们概述了一种建议的光子辅助模数转换器系统。来自锁模激光器的光脉冲触发由基于低温生长的GaAs的金属半导体金属器件制成的光电导开关。当被锁模激光脉冲激发时，这些设备的采样孔径约为a。几皮秒，从而实现高带宽采样。这些采样信号然后可以由CMOS电路数字化。并行的时间交错架构将利用许多开关/数字转换器通道来增加系统的总采样率。尽管可以将CMOS电路直接焊料键合到光电导开关，但是将电路与开关物理分开可能是有利的。原因包括电气隔离，开关的紧凑集成以及从电路中改进的数字数据提取。本论文着重于光调制器的使用，以使CMOS电路远离光电导开关。这些调制器基于并入p-i-n二极管结构中的GaAs / AlGaAs多量子阱。光调制器将采样的电信号线性转换为光信号，从而允许将电路放置在与采样开关分离的芯片上。我们演示了调制器的线性度，以及单通道转换速度大约为1 gigasample /秒。通过将采样开关倒装芯片连接到调制器，我们发现器件的线性度应允许分辨率为20 GHz带宽的信号至少有效位位数（SNOB）约为3.5。

著录项

  • 作者

    Chin, Henry.;

  • 作者单位

    Stanford University.;

  • 授予单位 Stanford University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 168 p.
  • 总页数 168
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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