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arXiv 0901.2767physics.ins-det
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基于光子时间拉伸技术的高速模数转换器功率调节

Power Scaling in High Speed Analog-to-Digital Converters using Photonic Time Stretch Technique

Shalabh Gupta, George C. Valley, Robert H. Walden, Bahram Jalali

摘要:

讨论了高速电子模数转换器(ADC)中功耗随输入带宽迅速增加的因素。我们发现,品质因数(FOM)(定义为每个转换步骤所需的能量)随中高分辨率高速ADC的带宽呈线性增加,或者等效地,功耗呈二次方增加。它表明,通过使用光子时间拉伸技术,它是可能的ADC中,该FOM保持恒定高达10 GHz的输入RF频率。使用这种技术,还可以克服由这种ADC中的电子器件的时钟抖动和速度限制引起的实现高分辨率的障碍。正在积极寻求使用光学器件来降低功耗,并为板级和芯片级串行通信链路实现更高的数据速率。同样,我们预计,除了提供更宽的带宽外,光学器件还将有助于降低高速ADC的功耗。

英文摘要:

Factors that contribute to the rapid increase in power dissipation as a function of input bandwidth in high speed electronic Analog-to-Digital Converters (ADCs) are discussed. We find that the figure of merit (FOM), defined as the energy required per conversion step, increases linearly with bandwidth for high-speed ADCs with moderate to high resolution, or equivalently, the power dissipation increases quadratically. It is shown that by use of photonic time-stretch technique, it is possible to have ADCs in which this FOM remains constant for up to 10 GHz input RF frequency. Using this technique, it is also possible to overcome the barrier to achieving high resolution caused by clock jitter and speed limitations of electronics in such ADCs. Use of optics is actively being pursued for reducing power dissipation and achieving higher data-rates for board-level and chip-level serial communication links. In the same manner, we expect that optics will also help in reducing power dissipation in high-speed ADCs in addition to providing broader bandwidths.

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